WebSVN – Kolibri OS – Diff – /drivers/video/drm/i915/i915_gem.c


/*
 * Copyright © 2008 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *
 * Authors:
 *    Eric Anholt 
 *
 */
 
#include 
#include 
#include "i915_drv.h"
#include "i915_trace.h"
#include "intel_drv.h"
#include 
#include 
//#include 
#include 
 
extern int x86_clflush_size;
 
#define PROT_READ       0x1             /* page can be read */
#define PROT_WRITE      0x2             /* page can be written */
#define MAP_SHARED      0x01            /* Share changes */
 
#undef mb
#undef rmb
#undef wmb
#define mb() asm volatile("mfence")
#define rmb() asm volatile ("lfence")
#define wmb() asm volatile ("sfence")
 
struct drm_i915_gem_object *get_fb_obj();
 
unsigned long vm_mmap(struct file *file, unsigned long addr,
         unsigned long len, unsigned long prot,
         unsigned long flag, unsigned long offset);
 
static inline void clflush(volatile void *__p)
{
    asm volatile("clflush %0" : "+m" (*(volatile char*)__p));
}
 
#define MAX_ERRNO       4095
 
#define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
 
 
#define I915_EXEC_CONSTANTS_MASK        (3<<6)
#define I915_EXEC_CONSTANTS_REL_GENERAL (0<<6) /* default */
#define I915_EXEC_CONSTANTS_ABSOLUTE    (1<<6)
#define I915_EXEC_CONSTANTS_REL_SURFACE (2<<6) /* gen4/5 only */
 
static void i915_gem_object_flush_gtt_write_domain(struct drm_i915_gem_object *obj);
static void i915_gem_object_flush_cpu_write_domain(struct drm_i915_gem_object *obj);
static __must_check int i915_gem_object_bind_to_gtt(struct drm_i915_gem_object *obj,
						    unsigned alignment,
						    bool map_and_fenceable,
						    bool nonblocking);
static int i915_gem_phys_pwrite(struct drm_device *dev,
				struct drm_i915_gem_object *obj,
				struct drm_i915_gem_pwrite *args,
				struct drm_file *file);
 
static void i915_gem_write_fence(struct drm_device *dev, int reg,
				 struct drm_i915_gem_object *obj);
static void i915_gem_object_update_fence(struct drm_i915_gem_object *obj,
					 struct drm_i915_fence_reg *fence,
					 bool enable);
 
static long i915_gem_purge(struct drm_i915_private *dev_priv, long target);
static void i915_gem_shrink_all(struct drm_i915_private *dev_priv);
static void i915_gem_object_truncate(struct drm_i915_gem_object *obj);
 
static inline void i915_gem_object_fence_lost(struct drm_i915_gem_object *obj)
{
	if (obj->tiling_mode)
		i915_gem_release_mmap(obj);
 
	/* As we do not have an associated fence register, we will force
	 * a tiling change if we ever need to acquire one.
	 */
	obj->fence_dirty = false;
	obj->fence_reg = I915_FENCE_REG_NONE;
}
 
/* some bookkeeping */
static void i915_gem_info_add_obj(struct drm_i915_private *dev_priv,
				  size_t size)
{
	dev_priv->mm.object_count++;
	dev_priv->mm.object_memory += size;
}
 
static void i915_gem_info_remove_obj(struct drm_i915_private *dev_priv,
				     size_t size)
{
	dev_priv->mm.object_count--;
	dev_priv->mm.object_memory -= size;
}
 
static int
i915_gem_wait_for_error(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct completion *x = &dev_priv->error_completion;
	unsigned long flags;
	int ret;
 
	if (!atomic_read(&dev_priv->mm.wedged))
		return 0;
#if 0
	/*
	 * Only wait 10 seconds for the gpu reset to complete to avoid hanging
	 * userspace. If it takes that long something really bad is going on and
	 * we should simply try to bail out and fail as gracefully as possible.
	 */
	ret = wait_for_completion_interruptible_timeout(x, 10*HZ);
	if (ret == 0) {
		DRM_ERROR("Timed out waiting for the gpu reset to complete\n");
		return -EIO;
	} else if (ret < 0) {
		return ret;
	}
 
	if (atomic_read(&dev_priv->mm.wedged)) {
		/* GPU is hung, bump the completion count to account for
		 * the token we just consumed so that we never hit zero and
		 * end up waiting upon a subsequent completion event that
		 * will never happen.
		 */
		spin_lock_irqsave(&x->wait.lock, flags);
		x->done++;
		spin_unlock_irqrestore(&x->wait.lock, flags);
	}
#endif
 
	return 0;
}
 
int i915_mutex_lock_interruptible(struct drm_device *dev)
{
	int ret;
 
	ret = i915_gem_wait_for_error(dev);
	if (ret)
		return ret;
 
    mutex_lock(&dev->struct_mutex);
 
	WARN_ON(i915_verify_lists(dev));
	return 0;
}
 
static inline bool
i915_gem_object_is_inactive(struct drm_i915_gem_object *obj)
{
	return obj->gtt_space && !obj->active;
}
 
 
#if 0
 
int
i915_gem_init_ioctl(struct drm_device *dev, void *data,
		    struct drm_file *file)
{
	struct drm_i915_gem_init *args = data;
 
	if (drm_core_check_feature(dev, DRIVER_MODESET))
		return -ENODEV;
 
	if (args->gtt_start >= args->gtt_end ||
	    (args->gtt_end | args->gtt_start) & (PAGE_SIZE - 1))
		return -EINVAL;
 
	/* GEM with user mode setting was never supported on ilk and later. */
	if (INTEL_INFO(dev)->gen >= 5)
		return -ENODEV;
 
	mutex_lock(&dev->struct_mutex);
	i915_gem_init_global_gtt(dev, args->gtt_start,
				 args->gtt_end, args->gtt_end);
	mutex_unlock(&dev->struct_mutex);
 
	return 0;
}
#endif
 
int
i915_gem_get_aperture_ioctl(struct drm_device *dev, void *data,
			    struct drm_file *file)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct drm_i915_gem_get_aperture *args = data;
	struct drm_i915_gem_object *obj;
	size_t pinned;
 
	pinned = 0;
	mutex_lock(&dev->struct_mutex);
	list_for_each_entry(obj, &dev_priv->mm.bound_list, gtt_list)
		if (obj->pin_count)
		pinned += obj->gtt_space->size;
	mutex_unlock(&dev->struct_mutex);
 
	args->aper_size = dev_priv->mm.gtt_total;
	args->aper_available_size = args->aper_size - pinned;
 
	return 0;
}
 
static int
i915_gem_create(struct drm_file *file,
		struct drm_device *dev,
		uint64_t size,
		uint32_t *handle_p)
{
	struct drm_i915_gem_object *obj;
	int ret;
	u32 handle;
 
 
 
	size = roundup(size, PAGE_SIZE);
	if (size == 0)
		return -EINVAL;
 
	/* Allocate the new object */
	obj = i915_gem_alloc_object(dev, size);
	if (obj == NULL)
		return -ENOMEM;
 
	ret = drm_gem_handle_create(file, &obj->base, &handle);
	if (ret) {
		drm_gem_object_release(&obj->base);
		i915_gem_info_remove_obj(dev->dev_private, obj->base.size);
		kfree(obj);
		return ret;
	}
 
	/* drop reference from allocate - handle holds it now */
	drm_gem_object_unreference(&obj->base);
	trace_i915_gem_object_create(obj);
 
	*handle_p = handle;
 
//    printf("%s obj %p handle %d\n", __FUNCTION__, obj, handle);
 
	return 0;
}
 
int
i915_gem_dumb_create(struct drm_file *file,
		     struct drm_device *dev,
		     struct drm_mode_create_dumb *args)
{
	/* have to work out size/pitch and return them */
	args->pitch = ALIGN(args->width * ((args->bpp + 7) / 8), 64);
	args->size = args->pitch * args->height;
	return i915_gem_create(file, dev,
			       args->size, &args->handle);
}
 
int i915_gem_dumb_destroy(struct drm_file *file,
			  struct drm_device *dev,
			  uint32_t handle)
{
	return drm_gem_handle_delete(file, handle);
}
 
/**
 * Creates a new mm object and returns a handle to it.
 */
int
i915_gem_create_ioctl(struct drm_device *dev, void *data,
		      struct drm_file *file)
{
	struct drm_i915_gem_create *args = data;
 
	return i915_gem_create(file, dev,
			       args->size, &args->handle);
}
 
static int i915_gem_object_needs_bit17_swizzle(struct drm_i915_gem_object *obj)
{
	drm_i915_private_t *dev_priv = obj->base.dev->dev_private;
 
	return dev_priv->mm.bit_6_swizzle_x == I915_BIT_6_SWIZZLE_9_10_17 &&
		obj->tiling_mode != I915_TILING_NONE;
}
#if 0
 
static inline int
__copy_to_user_swizzled(char __user *cpu_vaddr,
			const char *gpu_vaddr, int gpu_offset,
		int length)
{
	int ret, cpu_offset = 0;
 
	while (length > 0) {
		int cacheline_end = ALIGN(gpu_offset + 1, 64);
		int this_length = min(cacheline_end - gpu_offset, length);
		int swizzled_gpu_offset = gpu_offset ^ 64;
 
		ret = __copy_to_user(cpu_vaddr + cpu_offset,
				     gpu_vaddr + swizzled_gpu_offset,
				     this_length);
		if (ret)
			return ret + length;
 
		cpu_offset += this_length;
		gpu_offset += this_length;
		length -= this_length;
	}
 
	return 0;
}
 
static inline int
__copy_from_user_swizzled(char *gpu_vaddr, int gpu_offset,
			  const char __user *cpu_vaddr,
			  int length)
{
	int ret, cpu_offset = 0;
 
	while (length > 0) {
		int cacheline_end = ALIGN(gpu_offset + 1, 64);
		int this_length = min(cacheline_end - gpu_offset, length);
		int swizzled_gpu_offset = gpu_offset ^ 64;
 
		ret = __copy_from_user(gpu_vaddr + swizzled_gpu_offset,
			       cpu_vaddr + cpu_offset,
			       this_length);
		if (ret)
			return ret + length;
 
		cpu_offset += this_length;
		gpu_offset += this_length;
		length -= this_length;
	}
 
	return 0;
}
 
/* Per-page copy function for the shmem pread fastpath.
 * Flushes invalid cachelines before reading the target if
 * needs_clflush is set. */
static int
shmem_pread_fast(struct page *page, int shmem_page_offset, int page_length,
		 char __user *user_data,
		 bool page_do_bit17_swizzling, bool needs_clflush)
{
		char *vaddr;
		int ret;
 
	if (unlikely(page_do_bit17_swizzling))
		return -EINVAL;
 
		vaddr = kmap_atomic(page);
	if (needs_clflush)
		drm_clflush_virt_range(vaddr + shmem_page_offset,
				       page_length);
		ret = __copy_to_user_inatomic(user_data,
				      vaddr + shmem_page_offset,
					      page_length);
		kunmap_atomic(vaddr);
 
	return ret ? -EFAULT : 0;
}
 
static void
shmem_clflush_swizzled_range(char *addr, unsigned long length,
			     bool swizzled)
{
	if (unlikely(swizzled)) {
		unsigned long start = (unsigned long) addr;
		unsigned long end = (unsigned long) addr + length;
 
		/* For swizzling simply ensure that we always flush both
		 * channels. Lame, but simple and it works. Swizzled
		 * pwrite/pread is far from a hotpath - current userspace
		 * doesn't use it at all. */
		start = round_down(start, 128);
		end = round_up(end, 128);
 
		drm_clflush_virt_range((void *)start, end - start);
	} else {
		drm_clflush_virt_range(addr, length);
	}
 
}
 
/* Only difference to the fast-path function is that this can handle bit17
 * and uses non-atomic copy and kmap functions. */
static int
shmem_pread_slow(struct page *page, int shmem_page_offset, int page_length,
		 char __user *user_data,
		 bool page_do_bit17_swizzling, bool needs_clflush)
{
	char *vaddr;
	int ret;
 
	vaddr = kmap(page);
	if (needs_clflush)
		shmem_clflush_swizzled_range(vaddr + shmem_page_offset,
					     page_length,
					     page_do_bit17_swizzling);
 
	if (page_do_bit17_swizzling)
		ret = __copy_to_user_swizzled(user_data,
					      vaddr, shmem_page_offset,
					      page_length);
	else
		ret = __copy_to_user(user_data,
				     vaddr + shmem_page_offset,
				     page_length);
	kunmap(page);
 
	return ret ? - EFAULT : 0;
}
 
static int
i915_gem_shmem_pread(struct drm_device *dev,
			  struct drm_i915_gem_object *obj,
			  struct drm_i915_gem_pread *args,
			  struct drm_file *file)
{
	char __user *user_data;
	ssize_t remain;
	loff_t offset;
	int shmem_page_offset, page_length, ret = 0;
	int obj_do_bit17_swizzling, page_do_bit17_swizzling;
	int hit_slowpath = 0;
	int prefaulted = 0;
	int needs_clflush = 0;
	struct scatterlist *sg;
	int i;
 
	user_data = (char __user *) (uintptr_t) args->data_ptr;
	remain = args->size;
 
	obj_do_bit17_swizzling = i915_gem_object_needs_bit17_swizzle(obj);
 
	if (!(obj->base.read_domains & I915_GEM_DOMAIN_CPU)) {
		/* If we're not in the cpu read domain, set ourself into the gtt
		 * read domain and manually flush cachelines (if required). This
		 * optimizes for the case when the gpu will dirty the data
		 * anyway again before the next pread happens. */
		if (obj->cache_level == I915_CACHE_NONE)
			needs_clflush = 1;
		if (obj->gtt_space) {
			ret = i915_gem_object_set_to_gtt_domain(obj, false);
			if (ret)
				return ret;
		}
	}
 
	ret = i915_gem_object_get_pages(obj);
	if (ret)
		return ret;
 
	i915_gem_object_pin_pages(obj);
 
	offset = args->offset;
 
	for_each_sg(obj->pages->sgl, sg, obj->pages->nents, i) {
		struct page *page;
 
		if (i < offset >> PAGE_SHIFT)
			continue;
 
		if (remain <= 0)
			break;
 
		/* Operation in this page
		 *
		 * shmem_page_offset = offset within page in shmem file
		 * page_length = bytes to copy for this page
		 */
		shmem_page_offset = offset_in_page(offset);
		page_length = remain;
		if ((shmem_page_offset + page_length) > PAGE_SIZE)
			page_length = PAGE_SIZE - shmem_page_offset;
 
		page = sg_page(sg);
		page_do_bit17_swizzling = obj_do_bit17_swizzling &&
			(page_to_phys(page) & (1 << 17)) != 0;
 
		ret = shmem_pread_fast(page, shmem_page_offset, page_length,
				       user_data, page_do_bit17_swizzling,
				       needs_clflush);
		if (ret == 0)
			goto next_page;
 
		hit_slowpath = 1;
		mutex_unlock(&dev->struct_mutex);
 
		if (!prefaulted) {
			ret = fault_in_multipages_writeable(user_data, remain);
			/* Userspace is tricking us, but we've already clobbered
			 * its pages with the prefault and promised to write the
			 * data up to the first fault. Hence ignore any errors
			 * and just continue. */
			(void)ret;
			prefaulted = 1;
		}
 
		ret = shmem_pread_slow(page, shmem_page_offset, page_length,
				       user_data, page_do_bit17_swizzling,
				       needs_clflush);
 
		mutex_lock(&dev->struct_mutex);
 
next_page:
		mark_page_accessed(page);
 
		if (ret)
			goto out;
 
		remain -= page_length;
		user_data += page_length;
		offset += page_length;
	}
 
out:
	i915_gem_object_unpin_pages(obj);
 
	if (hit_slowpath) {
		/* Fixup: Kill any reinstated backing storage pages */
		if (obj->madv == __I915_MADV_PURGED)
			i915_gem_object_truncate(obj);
	}
 
	return ret;
}
 
/**
 * Reads data from the object referenced by handle.
 *
 * On error, the contents of *data are undefined.
 */
int
i915_gem_pread_ioctl(struct drm_device *dev, void *data,
		     struct drm_file *file)
{
	struct drm_i915_gem_pread *args = data;
	struct drm_i915_gem_object *obj;
	int ret = 0;
 
	if (args->size == 0)
		return 0;
 
	if (!access_ok(VERIFY_WRITE,
		       (char __user *)(uintptr_t)args->data_ptr,
		       args->size))
		return -EFAULT;
 
	ret = i915_mutex_lock_interruptible(dev);
	if (ret)
		return ret;
 
	obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
	if (&obj->base == NULL) {
		ret = -ENOENT;
		goto unlock;
	}
 
	/* Bounds check source.  */
	if (args->offset > obj->base.size ||
	    args->size > obj->base.size - args->offset) {
		ret = -EINVAL;
		goto out;
	}
 
	/* prime objects have no backing filp to GEM pread/pwrite
	 * pages from.
	 */
	if (!obj->base.filp) {
		ret = -EINVAL;
		goto out;
	}
 
	trace_i915_gem_object_pread(obj, args->offset, args->size);
 
	ret = i915_gem_shmem_pread(dev, obj, args, file);
 
out:
	drm_gem_object_unreference(&obj->base);
unlock:
	mutex_unlock(&dev->struct_mutex);
	return ret;
}
 
/* This is the fast write path which cannot handle
 * page faults in the source data
 */
 
static inline int
fast_user_write(struct io_mapping *mapping,
		loff_t page_base, int page_offset,
		char __user *user_data,
		int length)
{
	void __iomem *vaddr_atomic;
	void *vaddr;
	unsigned long unwritten;
 
	vaddr_atomic = io_mapping_map_atomic_wc(mapping, page_base);
	/* We can use the cpu mem copy function because this is X86. */
	vaddr = (void __force*)vaddr_atomic + page_offset;
	unwritten = __copy_from_user_inatomic_nocache(vaddr,
						      user_data, length);
	io_mapping_unmap_atomic(vaddr_atomic);
	return unwritten;
}
#endif
 
#define offset_in_page(p)       ((unsigned long)(p) & ~PAGE_MASK)
/**
 * This is the fast pwrite path, where we copy the data directly from the
 * user into the GTT, uncached.
 */
static int
i915_gem_gtt_pwrite_fast(struct drm_device *dev,
			 struct drm_i915_gem_object *obj,
			 struct drm_i915_gem_pwrite *args,
			 struct drm_file *file)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	ssize_t remain;
	loff_t offset, page_base;
	char __user *user_data;
	int page_offset, page_length, ret;
    char *vaddr;
 
	ret = i915_gem_object_pin(obj, 0, true, true);
	if (ret)
		goto out;
 
	ret = i915_gem_object_set_to_gtt_domain(obj, true);
	if (ret)
		goto out_unpin;
 
	ret = i915_gem_object_put_fence(obj);
	if (ret)
		goto out_unpin;
 
    vaddr = AllocKernelSpace(4096);
    if(vaddr == NULL)
    {
        ret = -ENOSPC;
        goto out_unpin;
    };
 
	user_data = (char __user *) (uintptr_t) args->data_ptr;
	remain = args->size;
 
	offset = obj->gtt_offset + args->offset;
 
	while (remain > 0) {
		/* Operation in this page
		 *
		 * page_base = page offset within aperture
		 * page_offset = offset within page
		 * page_length = bytes to copy for this page
		 */
		page_base = offset & PAGE_MASK;
		page_offset = offset_in_page(offset);
		page_length = remain;
		if ((page_offset + remain) > PAGE_SIZE)
			page_length = PAGE_SIZE - page_offset;
 
        MapPage(vaddr, page_base, PG_SW|PG_NOCACHE);
 
        memcpy(vaddr+page_offset, user_data, page_length);
 
		remain -= page_length;
		user_data += page_length;
		offset += page_length;
	}
 
    FreeKernelSpace(vaddr);
 
out_unpin:
	i915_gem_object_unpin(obj);
out:
    printf("% s ret = %d\n", __FUNCTION__, ret);
 
	return ret;
}
 
/* Per-page copy function for the shmem pwrite fastpath.
 * Flushes invalid cachelines before writing to the target if
 * needs_clflush_before is set and flushes out any written cachelines after
 * writing if needs_clflush is set. */
static int
shmem_pwrite_fast(struct page *page, int shmem_page_offset, int page_length,
		  char __user *user_data,
		  bool page_do_bit17_swizzling,
		  bool needs_clflush_before,
		  bool needs_clflush_after)
{
	char *vaddr;
	int ret = 0;
 
	if (unlikely(page_do_bit17_swizzling))
		return -EINVAL;
 
	vaddr = (char *)MapIoMem((addr_t)page, 4096, PG_SW);
	if (needs_clflush_before)
		drm_clflush_virt_range(vaddr + shmem_page_offset,
				       page_length);
	memcpy(vaddr + shmem_page_offset,
						user_data,
						page_length);
	if (needs_clflush_after)
		drm_clflush_virt_range(vaddr + shmem_page_offset,
				       page_length);
	FreeKernelSpace(vaddr);
 
	return ret ? -EFAULT : 0;
}
#if 0
 
/* Only difference to the fast-path function is that this can handle bit17
 * and uses non-atomic copy and kmap functions. */
static int
shmem_pwrite_slow(struct page *page, int shmem_page_offset, int page_length,
		  char __user *user_data,
		  bool page_do_bit17_swizzling,
		  bool needs_clflush_before,
		  bool needs_clflush_after)
{
	char *vaddr;
	int ret;
 
	vaddr = kmap(page);
	if (unlikely(needs_clflush_before || page_do_bit17_swizzling))
		shmem_clflush_swizzled_range(vaddr + shmem_page_offset,
					     page_length,
					     page_do_bit17_swizzling);
	if (page_do_bit17_swizzling)
		ret = __copy_from_user_swizzled(vaddr, shmem_page_offset,
						user_data,
						page_length);
	else
		ret = __copy_from_user(vaddr + shmem_page_offset,
				       user_data,
				       page_length);
	if (needs_clflush_after)
		shmem_clflush_swizzled_range(vaddr + shmem_page_offset,
					     page_length,
					     page_do_bit17_swizzling);
	kunmap(page);
 
	return ret ? -EFAULT : 0;
}
#endif
 
 
static int
i915_gem_shmem_pwrite(struct drm_device *dev,
		      struct drm_i915_gem_object *obj,
		      struct drm_i915_gem_pwrite *args,
		      struct drm_file *file)
{
	ssize_t remain;
	loff_t offset;
	char __user *user_data;
	int shmem_page_offset, page_length, ret = 0;
	int obj_do_bit17_swizzling, page_do_bit17_swizzling;
	int hit_slowpath = 0;
	int needs_clflush_after = 0;
	int needs_clflush_before = 0;
	int i;
	struct scatterlist *sg;
 
	user_data = (char __user *) (uintptr_t) args->data_ptr;
	remain = args->size;
 
	obj_do_bit17_swizzling = i915_gem_object_needs_bit17_swizzle(obj);
 
	if (obj->base.write_domain != I915_GEM_DOMAIN_CPU) {
		/* If we're not in the cpu write domain, set ourself into the gtt
		 * write domain and manually flush cachelines (if required). This
		 * optimizes for the case when the gpu will use the data
		 * right away and we therefore have to clflush anyway. */
		if (obj->cache_level == I915_CACHE_NONE)
			needs_clflush_after = 1;
		if (obj->gtt_space) {
			ret = i915_gem_object_set_to_gtt_domain(obj, true);
			if (ret)
				return ret;
		}
	}
	/* Same trick applies for invalidate partially written cachelines before
	 * writing.  */
	if (!(obj->base.read_domains & I915_GEM_DOMAIN_CPU)
	    && obj->cache_level == I915_CACHE_NONE)
		needs_clflush_before = 1;
 
	ret = i915_gem_object_get_pages(obj);
	if (ret)
		return ret;
 
	i915_gem_object_pin_pages(obj);
 
	offset = args->offset;
	obj->dirty = 1;
 
	for_each_sg(obj->pages->sgl, sg, obj->pages->nents, i) {
		struct page *page;
		int partial_cacheline_write;
 
		if (i < offset >> PAGE_SHIFT)
			continue;
 
		if (remain <= 0)
			break;
 
		/* Operation in this page
		 *
		 * shmem_page_offset = offset within page in shmem file
		 * page_length = bytes to copy for this page
		 */
		shmem_page_offset = offset_in_page(offset);
 
		page_length = remain;
		if ((shmem_page_offset + page_length) > PAGE_SIZE)
			page_length = PAGE_SIZE - shmem_page_offset;
 
		/* If we don't overwrite a cacheline completely we need to be
		 * careful to have up-to-date data by first clflushing. Don't
		 * overcomplicate things and flush the entire patch. */
		partial_cacheline_write = needs_clflush_before &&
			((shmem_page_offset | page_length)
				& (x86_clflush_size - 1));
 
		page = sg_page(sg);
		page_do_bit17_swizzling = obj_do_bit17_swizzling &&
			(page_to_phys(page) & (1 << 17)) != 0;
 
		ret = shmem_pwrite_fast(page, shmem_page_offset, page_length,
					user_data, page_do_bit17_swizzling,
					partial_cacheline_write,
					needs_clflush_after);
		if (ret == 0)
			goto next_page;
 
		hit_slowpath = 1;
		mutex_unlock(&dev->struct_mutex);
		dbgprintf("%s need shmem_pwrite_slow\n",__FUNCTION__);
 
//		ret = shmem_pwrite_slow(page, shmem_page_offset, page_length,
//					user_data, page_do_bit17_swizzling,
//					partial_cacheline_write,
//					needs_clflush_after);
 
		mutex_lock(&dev->struct_mutex);
 
next_page:
 
		if (ret)
			goto out;
 
		remain -= page_length;
		user_data += page_length;
		offset += page_length;
	}
 
out:
	i915_gem_object_unpin_pages(obj);
 
	if (hit_slowpath) {
		/* Fixup: Kill any reinstated backing storage pages */
		if (obj->madv == __I915_MADV_PURGED)
			i915_gem_object_truncate(obj);
		/* and flush dirty cachelines in case the object isn't in the cpu write
		 * domain anymore. */
		if (obj->base.write_domain != I915_GEM_DOMAIN_CPU) {
			i915_gem_clflush_object(obj);
			i915_gem_chipset_flush(dev);
		}
	}
 
	if (needs_clflush_after)
		i915_gem_chipset_flush(dev);
 
	return ret;
}
 
/**
 * Writes data to the object referenced by handle.
 *
 * On error, the contents of the buffer that were to be modified are undefined.
 */
int
i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
		      struct drm_file *file)
{
	struct drm_i915_gem_pwrite *args = data;
	struct drm_i915_gem_object *obj;
	int ret;
 
	if (args->size == 0)
		return 0;
 
	ret = i915_mutex_lock_interruptible(dev);
	if (ret)
		return ret;
 
	obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
	if (&obj->base == NULL) {
		ret = -ENOENT;
		goto unlock;
	}
 
	/* Bounds check destination. */
	if (args->offset > obj->base.size ||
	    args->size > obj->base.size - args->offset) {
		ret = -EINVAL;
		goto out;
	}
 
	/* prime objects have no backing filp to GEM pread/pwrite
	 * pages from.
	 */
	if (!obj->base.filp) {
		ret = -EINVAL;
		goto out;
	}
 
	trace_i915_gem_object_pwrite(obj, args->offset, args->size);
 
	ret = -EFAULT;
	/* We can only do the GTT pwrite on untiled buffers, as otherwise
	 * it would end up going through the fenced access, and we'll get
	 * different detiling behavior between reading and writing.
	 * pread/pwrite currently are reading and writing from the CPU
	 * perspective, requiring manual detiling by the client.
	 */
//   if (obj->phys_obj) {
//       ret = i915_gem_phys_pwrite(dev, obj, args, file);
//       goto out;
//   }
 
	if (obj->cache_level == I915_CACHE_NONE &&
	    obj->tiling_mode == I915_TILING_NONE &&
	    obj->base.write_domain != I915_GEM_DOMAIN_CPU) {
		ret = i915_gem_gtt_pwrite_fast(dev, obj, args, file);
		/* Note that the gtt paths might fail with non-page-backed user
		 * pointers (e.g. gtt mappings when moving data between
		 * textures). Fallback to the shmem path in that case. */
	}
 
	if (ret == -EFAULT || ret == -ENOSPC)
       ret = i915_gem_shmem_pwrite(dev, obj, args, file);
 
out:
	drm_gem_object_unreference(&obj->base);
unlock:
	mutex_unlock(&dev->struct_mutex);
	return ret;
}
 
int
i915_gem_check_wedge(struct drm_i915_private *dev_priv,
		     bool interruptible)
{
	if (atomic_read(&dev_priv->mm.wedged)) {
		struct completion *x = &dev_priv->error_completion;
		bool recovery_complete;
		unsigned long flags;
 
		/* Give the error handler a chance to run. */
		spin_lock_irqsave(&x->wait.lock, flags);
		recovery_complete = x->done > 0;
		spin_unlock_irqrestore(&x->wait.lock, flags);
 
		/* Non-interruptible callers can't handle -EAGAIN, hence return
		 * -EIO unconditionally for these. */
		if (!interruptible)
			return -EIO;
 
		/* Recovery complete, but still wedged means reset failure. */
		if (recovery_complete)
			return -EIO;
 
		return -EAGAIN;
	}
 
	return 0;
}
 
/*
 * Compare seqno against outstanding lazy request. Emit a request if they are
 * equal.
 */
static int
i915_gem_check_olr(struct intel_ring_buffer *ring, u32 seqno)
{
	int ret;
 
	BUG_ON(!mutex_is_locked(&ring->dev->struct_mutex));
 
	ret = 0;
	if (seqno == ring->outstanding_lazy_request)
		ret = i915_add_request(ring, NULL, NULL);
 
	return ret;
}
 
/**
 * __wait_seqno - wait until execution of seqno has finished
 * @ring: the ring expected to report seqno
 * @seqno: duh!
 * @interruptible: do an interruptible wait (normally yes)
 * @timeout: in - how long to wait (NULL forever); out - how much time remaining
 *
 * Returns 0 if the seqno was found within the alloted time. Else returns the
 * errno with remaining time filled in timeout argument.
 */
static int __wait_seqno(struct intel_ring_buffer *ring, u32 seqno,
			bool interruptible, struct timespec *timeout)
{
	drm_i915_private_t *dev_priv = ring->dev->dev_private;
	struct timespec before, now, wait_time={1,0};
	unsigned long timeout_jiffies;
	long end;
	bool wait_forever = true;
	int ret;
 
	if (i915_seqno_passed(ring->get_seqno(ring, true), seqno))
		return 0;
 
	trace_i915_gem_request_wait_begin(ring, seqno);
 
	if (timeout != NULL) {
		wait_time = *timeout;
		wait_forever = false;
	}
 
	timeout_jiffies = timespec_to_jiffies(&wait_time);
 
	if (WARN_ON(!ring->irq_get(ring)))
		return -ENODEV;
 
    /* Record current time in case interrupted by signal, or wedged * */
	getrawmonotonic(&before);
 
#define EXIT_COND \
	(i915_seqno_passed(ring->get_seqno(ring, false), seqno) || \
	atomic_read(&dev_priv->mm.wedged))
	do {
		if (interruptible)
			end = wait_event_interruptible_timeout(ring->irq_queue,
							       EXIT_COND,
							       timeout_jiffies);
		else
			end = wait_event_timeout(ring->irq_queue, EXIT_COND,
						 timeout_jiffies);
 
		ret = i915_gem_check_wedge(dev_priv, interruptible);
		if (ret)
			end = ret;
	} while (end == 0 && wait_forever);
 
	getrawmonotonic(&now);
 
	ring->irq_put(ring);
	trace_i915_gem_request_wait_end(ring, seqno);
#undef EXIT_COND
 
	if (timeout) {
//       struct timespec sleep_time = timespec_sub(now, before);
//       *timeout = timespec_sub(*timeout, sleep_time);
	}
 
	switch (end) {
	case -EIO:
	case -EAGAIN: /* Wedged */
	case -ERESTARTSYS: /* Signal */
		return (int)end;
	case 0: /* Timeout */
		if (timeout)
			set_normalized_timespec(timeout, 0, 0);
		return -ETIME;
	default: /* Completed */
		WARN_ON(end < 0); /* We're not aware of other errors */
		return 0;
	}
}
 
/**
 * Waits for a sequence number to be signaled, and cleans up the
 * request and object lists appropriately for that event.
 */
int
i915_wait_seqno(struct intel_ring_buffer *ring, uint32_t seqno)
{
	struct drm_device *dev = ring->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	bool interruptible = dev_priv->mm.interruptible;
	int ret;
 
	BUG_ON(!mutex_is_locked(&dev->struct_mutex));
	BUG_ON(seqno == 0);
 
	ret = i915_gem_check_wedge(dev_priv, interruptible);
	if (ret)
		return ret;
 
	ret = i915_gem_check_olr(ring, seqno);
	if (ret)
		return ret;
 
	return __wait_seqno(ring, seqno, interruptible, NULL);
}
 
/**
 * Ensures that all rendering to the object has completed and the object is
 * safe to unbind from the GTT or access from the CPU.
 */
static __must_check int
i915_gem_object_wait_rendering(struct drm_i915_gem_object *obj,
			       bool readonly)
{
	struct intel_ring_buffer *ring = obj->ring;
	u32 seqno;
	int ret;
 
	seqno = readonly ? obj->last_write_seqno : obj->last_read_seqno;
	if (seqno == 0)
		return 0;
 
	ret = i915_wait_seqno(ring, seqno);
       if (ret)
           return ret;
 
	i915_gem_retire_requests_ring(ring);
 
	/* Manually manage the write flush as we may have not yet
	 * retired the buffer.
	 */
	if (obj->last_write_seqno &&
	    i915_seqno_passed(seqno, obj->last_write_seqno)) {
		obj->last_write_seqno = 0;
		obj->base.write_domain &= ~I915_GEM_GPU_DOMAINS;
	}
 
	return 0;
}
 
/* A nonblocking variant of the above wait. This is a highly dangerous routine
 * as the object state may change during this call.
 */
static __must_check int
i915_gem_object_wait_rendering__nonblocking(struct drm_i915_gem_object *obj,
					    bool readonly)
{
	struct drm_device *dev = obj->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_ring_buffer *ring = obj->ring;
	u32 seqno;
	int ret;
 
	BUG_ON(!mutex_is_locked(&dev->struct_mutex));
	BUG_ON(!dev_priv->mm.interruptible);
 
	seqno = readonly ? obj->last_write_seqno : obj->last_read_seqno;
	if (seqno == 0)
		return 0;
 
	ret = i915_gem_check_wedge(dev_priv, true);
	if (ret)
		return ret;
 
	ret = i915_gem_check_olr(ring, seqno);
	if (ret)
		return ret;
 
	mutex_unlock(&dev->struct_mutex);
	ret = __wait_seqno(ring, seqno, true, NULL);
	mutex_lock(&dev->struct_mutex);
 
	i915_gem_retire_requests_ring(ring);
 
	/* Manually manage the write flush as we may have not yet
	 * retired the buffer.
	 */
	if (obj->last_write_seqno &&
	    i915_seqno_passed(seqno, obj->last_write_seqno)) {
		obj->last_write_seqno = 0;
		obj->base.write_domain &= ~I915_GEM_GPU_DOMAINS;
	}
 
	return ret;
}
 
/**
 * Called when user space prepares to use an object with the CPU, either
 * through the mmap ioctl's mapping or a GTT mapping.
 */
int
i915_gem_set_domain_ioctl(struct drm_device *dev, void *data,
			  struct drm_file *file)
{
	struct drm_i915_gem_set_domain *args = data;
	struct drm_i915_gem_object *obj;
	uint32_t read_domains = args->read_domains;
	uint32_t write_domain = args->write_domain;
	int ret;
 
	/* Only handle setting domains to types used by the CPU. */
	if (write_domain & I915_GEM_GPU_DOMAINS)
		return -EINVAL;
 
	if (read_domains & I915_GEM_GPU_DOMAINS)
		return -EINVAL;
 
	/* Having something in the write domain implies it's in the read
	 * domain, and only that read domain.  Enforce that in the request.
	 */
	if (write_domain != 0 && read_domains != write_domain)
		return -EINVAL;
 
	ret = i915_mutex_lock_interruptible(dev);
	if (ret)
		return ret;
 
	obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
	if (&obj->base == NULL) {
		ret = -ENOENT;
		goto unlock;
	}
 
	/* Try to flush the object off the GPU without holding the lock.
	 * We will repeat the flush holding the lock in the normal manner
	 * to catch cases where we are gazumped.
	 */
	ret = i915_gem_object_wait_rendering__nonblocking(obj, !write_domain);
	if (ret)
		goto unref;
 
	if (read_domains & I915_GEM_DOMAIN_GTT) {
		ret = i915_gem_object_set_to_gtt_domain(obj, write_domain != 0);
 
		/* Silently promote "you're not bound, there was nothing to do"
		 * to success, since the client was just asking us to
		 * make sure everything was done.
		 */
		if (ret == -EINVAL)
			ret = 0;
	} else {
		ret = i915_gem_object_set_to_cpu_domain(obj, write_domain != 0);
	}
 
unref:
	drm_gem_object_unreference(&obj->base);
unlock:
	mutex_unlock(&dev->struct_mutex);
	return ret;
}
 
 
 
 
 
 
/**
 * Maps the contents of an object, returning the address it is mapped
 * into.
 *
 * While the mapping holds a reference on the contents of the object, it doesn't
 * imply a ref on the object itself.
 */
int
i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
		    struct drm_file *file)
{
	struct drm_i915_gem_mmap *args = data;
	struct drm_gem_object *obj;
	unsigned long addr = 0;
 
	obj = drm_gem_object_lookup(dev, file, args->handle);
	if (obj == NULL)
		return -ENOENT;
	
    //dbgprintf("%s offset %lld size %lld\n",
//                __FUNCTION__, args->offset, args->size);
	/* prime objects have no backing filp to GEM mmap
	 * pages from.
	 */
	if (!obj->filp) {
		drm_gem_object_unreference_unlocked(obj);
		return -EINVAL;
	}
 
    addr = vm_mmap(obj->filp, 0, args->size,
              PROT_READ | PROT_WRITE, MAP_SHARED,
              args->offset);
	drm_gem_object_unreference_unlocked(obj);
    if (IS_ERR((void *)addr))
        return addr;
 
	args->addr_ptr = (uint64_t) addr;
 
    return 0;
}
 
 
 
 
 
 
 
 
 
 
 
 
 
/**
 * i915_gem_release_mmap - remove physical page mappings
 * @obj: obj in question
 *
 * Preserve the reservation of the mmapping with the DRM core code, but
 * relinquish ownership of the pages back to the system.
 *
 * It is vital that we remove the page mapping if we have mapped a tiled
 * object through the GTT and then lose the fence register due to
 * resource pressure. Similarly if the object has been moved out of the
 * aperture, than pages mapped into userspace must be revoked. Removing the
 * mapping will then trigger a page fault on the next user access, allowing
 * fixup by i915_gem_fault().
 */
void
i915_gem_release_mmap(struct drm_i915_gem_object *obj)
{
	if (!obj->fault_mappable)
		return;
 
	if (obj->base.dev->dev_mapping)
//		unmap_mapping_range(obj->base.dev->dev_mapping,
//				    (loff_t)obj->base.map_list.hash.key<
//				    obj->base.size, 1);
 
	obj->fault_mappable = false;
}
 
static uint32_t
i915_gem_get_gtt_size(struct drm_device *dev, uint32_t size, int tiling_mode)
{
	uint32_t gtt_size;
 
	if (INTEL_INFO(dev)->gen >= 4 ||
	    tiling_mode == I915_TILING_NONE)
		return size;
 
	/* Previous chips need a power-of-two fence region when tiling */
	if (INTEL_INFO(dev)->gen == 3)
		gtt_size = 1024*1024;
	else
		gtt_size = 512*1024;
 
	while (gtt_size < size)
		gtt_size <<= 1;
 
	return gtt_size;
}
 
/**
 * i915_gem_get_gtt_alignment - return required GTT alignment for an object
 * @obj: object to check
 *
 * Return the required GTT alignment for an object, taking into account
 * potential fence register mapping.
 */
static uint32_t
i915_gem_get_gtt_alignment(struct drm_device *dev,
			   uint32_t size,
			   int tiling_mode)
{
	/*
	 * Minimum alignment is 4k (GTT page size), but might be greater
	 * if a fence register is needed for the object.
	 */
	if (INTEL_INFO(dev)->gen >= 4 ||
	    tiling_mode == I915_TILING_NONE)
		return 4096;
 
	/*
	 * Previous chips need to be aligned to the size of the smallest
	 * fence register that can contain the object.
	 */
	return i915_gem_get_gtt_size(dev, size, tiling_mode);
}
 
/**
 * i915_gem_get_unfenced_gtt_alignment - return required GTT alignment for an
 *					 unfenced object
 * @dev: the device
 * @size: size of the object
 * @tiling_mode: tiling mode of the object
 *
 * Return the required GTT alignment for an object, only taking into account
 * unfenced tiled surface requirements.
 */
uint32_t
i915_gem_get_unfenced_gtt_alignment(struct drm_device *dev,
				    uint32_t size,
				    int tiling_mode)
{
	/*
	 * Minimum alignment is 4k (GTT page size) for sane hw.
	 */
	if (INTEL_INFO(dev)->gen >= 4 || IS_G33(dev) ||
	    tiling_mode == I915_TILING_NONE)
		return 4096;
 
	/* Previous hardware however needs to be aligned to a power-of-two
	 * tile height. The simplest method for determining this is to reuse
	 * the power-of-tile object size.
	 */
	return i915_gem_get_gtt_size(dev, size, tiling_mode);
}
 
/* Immediately discard the backing storage */
static void
i915_gem_object_truncate(struct drm_i915_gem_object *obj)
{
//	struct inode *inode;
 
//	i915_gem_object_free_mmap_offset(obj);
 
	if (obj->base.filp == NULL)
		return;
 
	/* Our goal here is to return as much of the memory as
	 * is possible back to the system as we are called from OOM.
	 * To do this we must instruct the shmfs to drop all of its
	 * backing pages, *now*.
	 */
//	inode = obj->base.filp->f_path.dentry->d_inode;
//	shmem_truncate_range(inode, 0, (loff_t)-1);
 
	obj->madv = __I915_MADV_PURGED;
}
 
static inline int
i915_gem_object_is_purgeable(struct drm_i915_gem_object *obj)
{
	return obj->madv == I915_MADV_DONTNEED;
}
 
static void
i915_gem_object_put_pages_gtt(struct drm_i915_gem_object *obj)
{
	int page_count = obj->base.size / PAGE_SIZE;
	struct scatterlist *sg;
	int ret, i;
 
	BUG_ON(obj->madv == __I915_MADV_PURGED);
 
	ret = i915_gem_object_set_to_cpu_domain(obj, true);
	if (ret) {
		/* In the event of a disaster, abandon all caches and
		 * hope for the best.
		 */
		WARN_ON(ret != -EIO);
		i915_gem_clflush_object(obj);
		obj->base.read_domains = obj->base.write_domain = I915_GEM_DOMAIN_CPU;
	}
 
	if (obj->madv == I915_MADV_DONTNEED)
		obj->dirty = 0;
 
	for_each_sg(obj->pages->sgl, sg, page_count, i) {
		struct page *page = sg_page(sg);
 
        page_cache_release(page);
	}
    //DRM_DEBUG_KMS("%s release %d pages\n", __FUNCTION__, page_count);
 
 
	obj->dirty = 0;
 
	sg_free_table(obj->pages);
	kfree(obj->pages);
}
 
static int
i915_gem_object_put_pages(struct drm_i915_gem_object *obj)
{
	const struct drm_i915_gem_object_ops *ops = obj->ops;
 
	if (obj->pages == NULL)
		return 0;
 
	BUG_ON(obj->gtt_space);
 
	if (obj->pages_pin_count)
		return -EBUSY;
 
	/* ->put_pages might need to allocate memory for the bit17 swizzle
	 * array, hence protect them from being reaped by removing them from gtt
	 * lists early. */
	list_del(&obj->gtt_list);
 
	ops->put_pages(obj);
	obj->pages = NULL;
 
	if (i915_gem_object_is_purgeable(obj))
		i915_gem_object_truncate(obj);
 
	return 0;
}
 
 
 
 
 
 
 
 
static int
i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj)
{
	struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
    int page_count, i;
	struct address_space *mapping;
	struct sg_table *st;
	struct scatterlist *sg;
	struct page *page;
	gfp_t gfp;
 
	/* Assert that the object is not currently in any GPU domain. As it
	 * wasn't in the GTT, there shouldn't be any way it could have been in
	 * a GPU cache
	 */
	BUG_ON(obj->base.read_domains & I915_GEM_GPU_DOMAINS);
	BUG_ON(obj->base.write_domain & I915_GEM_GPU_DOMAINS);
 
	st = kmalloc(sizeof(*st), GFP_KERNEL);
	if (st == NULL)
		return -ENOMEM;
 
	page_count = obj->base.size / PAGE_SIZE;
	if (sg_alloc_table(st, page_count, GFP_KERNEL)) {
		sg_free_table(st);
		kfree(st);
		return -ENOMEM;
	}
 
	/* Get the list of pages out of our struct file.  They'll be pinned
	 * at this point until we release them.
	 *
	 * Fail silently without starting the shrinker
	 */
	for_each_sg(st->sgl, sg, page_count, i) {
		page = shmem_read_mapping_page_gfp(obj->base.filp, i, gfp);
		if (IS_ERR(page)) {
            dbgprintf("%s invalid page %p\n", __FUNCTION__, page);
			goto err_pages;
 
		}
		sg_set_page(sg, page, PAGE_SIZE, 0);
	}
 
	obj->pages = st;
 
//    DRM_DEBUG_KMS("%s alloc %d pages\n", __FUNCTION__, page_count);
 
	return 0;
 
err_pages:
	for_each_sg(st->sgl, sg, i, page_count)
		page_cache_release(sg_page(sg));
	sg_free_table(st);
	kfree(st);
	return PTR_ERR(page);
}
 
/* Ensure that the associated pages are gathered from the backing storage
 * and pinned into our object. i915_gem_object_get_pages() may be called
 * multiple times before they are released by a single call to
 * i915_gem_object_put_pages() - once the pages are no longer referenced
 * either as a result of memory pressure (reaping pages under the shrinker)
 * or as the object is itself released.
 */
int
i915_gem_object_get_pages(struct drm_i915_gem_object *obj)
{
	struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
	const struct drm_i915_gem_object_ops *ops = obj->ops;
	int ret;
 
	if (obj->pages)
		return 0;
 
	BUG_ON(obj->pages_pin_count);
 
	ret = ops->get_pages(obj);
	if (ret)
		return ret;
 
	list_add_tail(&obj->gtt_list, &dev_priv->mm.unbound_list);
    return 0;
}
 
void
i915_gem_object_move_to_active(struct drm_i915_gem_object *obj,
			       struct intel_ring_buffer *ring)
{
	struct drm_device *dev = obj->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 seqno = intel_ring_get_seqno(ring);
 
	BUG_ON(ring == NULL);
	obj->ring = ring;
 
	/* Add a reference if we're newly entering the active list. */
	if (!obj->active) {
		drm_gem_object_reference(&obj->base);
		obj->active = 1;
	}
 
	/* Move from whatever list we were on to the tail of execution. */
	list_move_tail(&obj->mm_list, &dev_priv->mm.active_list);
	list_move_tail(&obj->ring_list, &ring->active_list);
 
	obj->last_read_seqno = seqno;
 
	if (obj->fenced_gpu_access) {
		obj->last_fenced_seqno = seqno;
 
		/* Bump MRU to take account of the delayed flush */
		if (obj->fence_reg != I915_FENCE_REG_NONE) {
		struct drm_i915_fence_reg *reg;
 
		reg = &dev_priv->fence_regs[obj->fence_reg];
			list_move_tail(®->lru_list,
				       &dev_priv->mm.fence_list);
		}
	}
}
 
static void
i915_gem_object_move_to_inactive(struct drm_i915_gem_object *obj)
{
	struct drm_device *dev = obj->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
 
	BUG_ON(obj->base.write_domain & ~I915_GEM_GPU_DOMAINS);
	BUG_ON(!obj->active);
 
	if (obj->pin_count) /* are we a framebuffer? */
		intel_mark_fb_idle(obj);
 
		list_move_tail(&obj->mm_list, &dev_priv->mm.inactive_list);
 
	list_del_init(&obj->ring_list);
	obj->ring = NULL;
 
	obj->last_read_seqno = 0;
	obj->last_write_seqno = 0;
	obj->base.write_domain = 0;
 
	obj->last_fenced_seqno = 0;
	obj->fenced_gpu_access = false;
 
	obj->active = 0;
	drm_gem_object_unreference(&obj->base);
 
	WARN_ON(i915_verify_lists(dev));
}
 
static int
i915_gem_handle_seqno_wrap(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_ring_buffer *ring;
	int ret, i, j;
 
	/* The hardware uses various monotonic 32-bit counters, if we
	 * detect that they will wraparound we need to idle the GPU
	 * and reset those counters.
	 */
	ret = 0;
	for_each_ring(ring, dev_priv, i) {
		for (j = 0; j < ARRAY_SIZE(ring->sync_seqno); j++)
			ret |= ring->sync_seqno[j] != 0;
	}
	if (ret == 0)
		return ret;
 
	ret = i915_gpu_idle(dev);
	if (ret)
		return ret;
 
	i915_gem_retire_requests(dev);
	for_each_ring(ring, dev_priv, i) {
		for (j = 0; j < ARRAY_SIZE(ring->sync_seqno); j++)
			ring->sync_seqno[j] = 0;
	}
 
	return 0;
}
 
int
i915_gem_get_seqno(struct drm_device *dev, u32 *seqno)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
 
	/* reserve 0 for non-seqno */
	if (dev_priv->next_seqno == 0) {
		int ret = i915_gem_handle_seqno_wrap(dev);
		if (ret)
			return ret;
 
		dev_priv->next_seqno = 1;
	}
 
	*seqno = dev_priv->next_seqno++;
	return 0;
}
 
int
i915_add_request(struct intel_ring_buffer *ring,
		 struct drm_file *file,
		 u32 *out_seqno)
{
	drm_i915_private_t *dev_priv = ring->dev->dev_private;
	struct drm_i915_gem_request *request;
	u32 request_ring_position;
	int was_empty;
	int ret;
 
	/*
	 * Emit any outstanding flushes - execbuf can fail to emit the flush
	 * after having emitted the batchbuffer command. Hence we need to fix
	 * things up similar to emitting the lazy request. The difference here
	 * is that the flush _must_ happen before the next request, no matter
	 * what.
	 */
	ret = intel_ring_flush_all_caches(ring);
	if (ret)
		return ret;
 
	request = kmalloc(sizeof(*request), GFP_KERNEL);
	if (request == NULL)
		return -ENOMEM;
 
 
	/* Record the position of the start of the request so that
	 * should we detect the updated seqno part-way through the
	 * GPU processing the request, we never over-estimate the
	 * position of the head.
	 */
	request_ring_position = intel_ring_get_tail(ring);
 
	ret = ring->add_request(ring);
	if (ret) {
		kfree(request);
	    return ret;
	}
 
	request->seqno = intel_ring_get_seqno(ring);
	request->ring = ring;
	request->tail = request_ring_position;
    request->emitted_jiffies = GetTimerTicks();
	was_empty = list_empty(&ring->request_list);
	list_add_tail(&request->list, &ring->request_list);
	request->file_priv = NULL;
 
	if (file) {
		struct drm_i915_file_private *file_priv = file->driver_priv;
 
		spin_lock(&file_priv->mm.lock);
		request->file_priv = file_priv;
		list_add_tail(&request->client_list,
			      &file_priv->mm.request_list);
		spin_unlock(&file_priv->mm.lock);
	}
 
	trace_i915_gem_request_add(ring, request->seqno);
	ring->outstanding_lazy_request = 0;
 
	if (!dev_priv->mm.suspended) {
		if (i915_enable_hangcheck) {
//			mod_timer(&dev_priv->hangcheck_timer,
//				  jiffies +
//				  msecs_to_jiffies(DRM_I915_HANGCHECK_PERIOD));
		}
		if (was_empty) {
           queue_delayed_work(dev_priv->wq,
                      &dev_priv->mm.retire_work, HZ);
			intel_mark_busy(dev_priv->dev);
		}
	}
 
	if (out_seqno)
		*out_seqno = request->seqno;
	return 0;
}
 
static inline void
i915_gem_request_remove_from_client(struct drm_i915_gem_request *request)
{
	struct drm_i915_file_private *file_priv = request->file_priv;
 
	if (!file_priv)
		return;
 
	spin_lock(&file_priv->mm.lock);
	if (request->file_priv) {
		list_del(&request->client_list);
		request->file_priv = NULL;
	}
	spin_unlock(&file_priv->mm.lock);
}
 
static void i915_gem_reset_ring_lists(struct drm_i915_private *dev_priv,
				      struct intel_ring_buffer *ring)
{
	while (!list_empty(&ring->request_list)) {
		struct drm_i915_gem_request *request;
 
		request = list_first_entry(&ring->request_list,
					   struct drm_i915_gem_request,
					   list);
 
		list_del(&request->list);
		i915_gem_request_remove_from_client(request);
		kfree(request);
	}
 
	while (!list_empty(&ring->active_list)) {
		struct drm_i915_gem_object *obj;
 
		obj = list_first_entry(&ring->active_list,
				       struct drm_i915_gem_object,
				       ring_list);
 
		i915_gem_object_move_to_inactive(obj);
	}
}
 
static void i915_gem_reset_fences(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	int i;
 
	for (i = 0; i < dev_priv->num_fence_regs; i++) {
		struct drm_i915_fence_reg *reg = &dev_priv->fence_regs[i];
 
		i915_gem_write_fence(dev, i, NULL);
 
		if (reg->obj)
			i915_gem_object_fence_lost(reg->obj);
 
		reg->pin_count = 0;
		reg->obj = NULL;
		INIT_LIST_HEAD(®->lru_list);
	}
 
	INIT_LIST_HEAD(&dev_priv->mm.fence_list);
}
 
void i915_gem_reset(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct drm_i915_gem_object *obj;
	struct intel_ring_buffer *ring;
	int i;
 
	for_each_ring(ring, dev_priv, i)
		i915_gem_reset_ring_lists(dev_priv, ring);
 
	/* Move everything out of the GPU domains to ensure we do any
	 * necessary invalidation upon reuse.
	 */
	list_for_each_entry(obj,
			    &dev_priv->mm.inactive_list,
			    mm_list)
	{
		obj->base.read_domains &= ~I915_GEM_GPU_DOMAINS;
	}
 
	/* The fence registers are invalidated so clear them out */
	i915_gem_reset_fences(dev);
}
 
/**
 * This function clears the request list as sequence numbers are passed.
 */
void
i915_gem_retire_requests_ring(struct intel_ring_buffer *ring)
{
	uint32_t seqno;
 
	if (list_empty(&ring->request_list))
		return;
 
	WARN_ON(i915_verify_lists(ring->dev));
 
	seqno = ring->get_seqno(ring, true);
 
	while (!list_empty(&ring->request_list)) {
		struct drm_i915_gem_request *request;
 
		request = list_first_entry(&ring->request_list,
					   struct drm_i915_gem_request,
					   list);
 
		if (!i915_seqno_passed(seqno, request->seqno))
			break;
 
		trace_i915_gem_request_retire(ring, request->seqno);
		/* We know the GPU must have read the request to have
		 * sent us the seqno + interrupt, so use the position
		 * of tail of the request to update the last known position
		 * of the GPU head.
		 */
		ring->last_retired_head = request->tail;
 
		list_del(&request->list);
		i915_gem_request_remove_from_client(request);
		kfree(request);
	}
 
	/* Move any buffers on the active list that are no longer referenced
	 * by the ringbuffer to the flushing/inactive lists as appropriate.
	 */
	while (!list_empty(&ring->active_list)) {
		struct drm_i915_gem_object *obj;
 
		obj = list_first_entry(&ring->active_list,
				      struct drm_i915_gem_object,
				      ring_list);
 
		if (!i915_seqno_passed(seqno, obj->last_read_seqno))
			break;
 
			i915_gem_object_move_to_inactive(obj);
	}
 
	if (unlikely(ring->trace_irq_seqno &&
		     i915_seqno_passed(seqno, ring->trace_irq_seqno))) {
		ring->irq_put(ring);
		ring->trace_irq_seqno = 0;
	}
 
	WARN_ON(i915_verify_lists(ring->dev));
}
 
void
i915_gem_retire_requests(struct drm_device *dev)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	struct intel_ring_buffer *ring;
	int i;
 
	for_each_ring(ring, dev_priv, i)
		i915_gem_retire_requests_ring(ring);
}
 
static void
i915_gem_retire_work_handler(struct work_struct *work)
{
	drm_i915_private_t *dev_priv;
	struct drm_device *dev;
	struct intel_ring_buffer *ring;
	bool idle;
	int i;
 
	dev_priv = container_of(work, drm_i915_private_t,
				mm.retire_work.work);
	dev = dev_priv->dev;
 
	/* Come back later if the device is busy... */
	if (!mutex_trylock(&dev->struct_mutex)) {
        queue_delayed_work(dev_priv->wq, &dev_priv->mm.retire_work, HZ);
        return;
	}
 
	i915_gem_retire_requests(dev);
 
	/* Send a periodic flush down the ring so we don't hold onto GEM
	 * objects indefinitely.
	 */
	idle = true;
	for_each_ring(ring, dev_priv, i) {
		if (ring->gpu_caches_dirty)
			i915_add_request(ring, NULL, NULL);
 
		idle &= list_empty(&ring->request_list);
	}
 
   if (!dev_priv->mm.suspended && !idle)
       queue_delayed_work(dev_priv->wq, &dev_priv->mm.retire_work, HZ);
	if (idle)
		intel_mark_idle(dev);
 
	mutex_unlock(&dev->struct_mutex);
}
 
/**
 * Ensures that an object will eventually get non-busy by flushing any required
 * write domains, emitting any outstanding lazy request and retiring and
 * completed requests.
 */
static int
i915_gem_object_flush_active(struct drm_i915_gem_object *obj)
{
	int ret;
 
	if (obj->active) {
		ret = i915_gem_check_olr(obj->ring, obj->last_read_seqno);
		if (ret)
			return ret;
 
		i915_gem_retire_requests_ring(obj->ring);
	}
 
	return 0;
}
 
/**
 * i915_gem_wait_ioctl - implements DRM_IOCTL_I915_GEM_WAIT
 * @DRM_IOCTL_ARGS: standard ioctl arguments
 *
 * Returns 0 if successful, else an error is returned with the remaining time in
 * the timeout parameter.
 *  -ETIME: object is still busy after timeout
 *  -ERESTARTSYS: signal interrupted the wait
 *  -ENONENT: object doesn't exist
 * Also possible, but rare:
 *  -EAGAIN: GPU wedged
 *  -ENOMEM: damn
 *  -ENODEV: Internal IRQ fail
 *  -E?: The add request failed
 *
 * The wait ioctl with a timeout of 0 reimplements the busy ioctl. With any
 * non-zero timeout parameter the wait ioctl will wait for the given number of
 * nanoseconds on an object becoming unbusy. Since the wait itself does so
 * without holding struct_mutex the object may become re-busied before this
 * function completes. A similar but shorter * race condition exists in the busy
 * ioctl
 */
 
 
 
 
 
 
 
 
 
 
 
 
/**
 * i915_gem_object_sync - sync an object to a ring.
 *
 * @obj: object which may be in use on another ring.
 * @to: ring we wish to use the object on. May be NULL.
 *
 * This code is meant to abstract object synchronization with the GPU.
 * Calling with NULL implies synchronizing the object with the CPU
 * rather than a particular GPU ring.
 *
 * Returns 0 if successful, else propagates up the lower layer error.
 */
int
i915_gem_object_sync(struct drm_i915_gem_object *obj,
		     struct intel_ring_buffer *to)
{
	struct intel_ring_buffer *from = obj->ring;
	u32 seqno;
	int ret, idx;
 
	if (from == NULL || to == from)
		return 0;
 
	if (to == NULL || !i915_semaphore_is_enabled(obj->base.dev))
		return i915_gem_object_wait_rendering(obj, false);
 
	idx = intel_ring_sync_index(from, to);
 
	seqno = obj->last_read_seqno;
	if (seqno <= from->sync_seqno[idx])
		return 0;
 
	ret = i915_gem_check_olr(obj->ring, seqno);
	if (ret)
		return ret;
 
	ret = to->sync_to(to, from, seqno);
	if (!ret)
		/* We use last_read_seqno because sync_to()
		 * might have just caused seqno wrap under
		 * the radar.
		 */
		from->sync_seqno[idx] = obj->last_read_seqno;
 
	return ret;
}
 
static void i915_gem_object_finish_gtt(struct drm_i915_gem_object *obj)
{
	u32 old_write_domain, old_read_domains;
 
	/* Act a barrier for all accesses through the GTT */
	mb();
 
	/* Force a pagefault for domain tracking on next user access */
//	i915_gem_release_mmap(obj);
 
	if ((obj->base.read_domains & I915_GEM_DOMAIN_GTT) == 0)
		return;
 
	old_read_domains = obj->base.read_domains;
	old_write_domain = obj->base.write_domain;
 
	obj->base.read_domains &= ~I915_GEM_DOMAIN_GTT;
	obj->base.write_domain &= ~I915_GEM_DOMAIN_GTT;
 
	trace_i915_gem_object_change_domain(obj,
					    old_read_domains,
					    old_write_domain);
}
 
/**
 * Unbinds an object from the GTT aperture.
 */
int
i915_gem_object_unbind(struct drm_i915_gem_object *obj)
{
	drm_i915_private_t *dev_priv = obj->base.dev->dev_private;
	int ret = 0;
 
    if(obj == get_fb_obj())
        return 0;
 
	if (obj->gtt_space == NULL)
		return 0;
 
	if (obj->pin_count)
		return -EBUSY;
 
	BUG_ON(obj->pages == NULL);
 
	ret = i915_gem_object_finish_gpu(obj);
	if (ret)
		return ret;
	/* Continue on if we fail due to EIO, the GPU is hung so we
	 * should be safe and we need to cleanup or else we might
	 * cause memory corruption through use-after-free.
	 */
 
	i915_gem_object_finish_gtt(obj);
 
	/* release the fence reg _after_ flushing */
	ret = i915_gem_object_put_fence(obj);
	if (ret)
		return ret;
 
	trace_i915_gem_object_unbind(obj);
 
	if (obj->has_global_gtt_mapping)
        i915_gem_gtt_unbind_object(obj);
	if (obj->has_aliasing_ppgtt_mapping) {
		i915_ppgtt_unbind_object(dev_priv->mm.aliasing_ppgtt, obj);
		obj->has_aliasing_ppgtt_mapping = 0;
	}
	i915_gem_gtt_finish_object(obj);
 
	list_del(&obj->mm_list);
	list_move_tail(&obj->gtt_list, &dev_priv->mm.unbound_list);
	/* Avoid an unnecessary call to unbind on rebind. */
	obj->map_and_fenceable = true;
 
	drm_mm_put_block(obj->gtt_space);
	obj->gtt_space = NULL;
	obj->gtt_offset = 0;
 
	return 0;
}
 
int i915_gpu_idle(struct drm_device *dev)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	struct intel_ring_buffer *ring;
	int ret, i;
 
	/* Flush everything onto the inactive list. */
	for_each_ring(ring, dev_priv, i) {
		ret = i915_switch_context(ring, NULL, DEFAULT_CONTEXT_ID);
		if (ret)
			return ret;
 
		ret = intel_ring_idle(ring);
		if (ret)
			return ret;
	}
 
	return 0;
}
 
static void sandybridge_write_fence_reg(struct drm_device *dev, int reg,
					struct drm_i915_gem_object *obj)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	uint64_t val;
 
	if (obj) {
		u32 size = obj->gtt_space->size;
 
		val = (uint64_t)((obj->gtt_offset + size - 4096) &
				 0xfffff000) << 32;
		val |= obj->gtt_offset & 0xfffff000;
		val |= (uint64_t)((obj->stride / 128) - 1) <<
			SANDYBRIDGE_FENCE_PITCH_SHIFT;
 
		if (obj->tiling_mode == I915_TILING_Y)
			val |= 1 << I965_FENCE_TILING_Y_SHIFT;
		val |= I965_FENCE_REG_VALID;
	} else
		val = 0;
 
	I915_WRITE64(FENCE_REG_SANDYBRIDGE_0 + reg * 8, val);
	POSTING_READ(FENCE_REG_SANDYBRIDGE_0 + reg * 8);
}
 
static void i965_write_fence_reg(struct drm_device *dev, int reg,
				 struct drm_i915_gem_object *obj)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	uint64_t val;
 
	if (obj) {
		u32 size = obj->gtt_space->size;
 
		val = (uint64_t)((obj->gtt_offset + size - 4096) &
				 0xfffff000) << 32;
		val |= obj->gtt_offset & 0xfffff000;
		val |= ((obj->stride / 128) - 1) << I965_FENCE_PITCH_SHIFT;
		if (obj->tiling_mode == I915_TILING_Y)
			val |= 1 << I965_FENCE_TILING_Y_SHIFT;
		val |= I965_FENCE_REG_VALID;
	} else
		val = 0;
 
	I915_WRITE64(FENCE_REG_965_0 + reg * 8, val);
	POSTING_READ(FENCE_REG_965_0 + reg * 8);
}
 
static void i915_write_fence_reg(struct drm_device *dev, int reg,
				 struct drm_i915_gem_object *obj)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	u32 val;
 
	if (obj) {
		u32 size = obj->gtt_space->size;
		int pitch_val;
		int tile_width;
 
		WARN((obj->gtt_offset & ~I915_FENCE_START_MASK) ||
		     (size & -size) != size ||
		     (obj->gtt_offset & (size - 1)),
		     "object 0x%08x [fenceable? %d] not 1M or pot-size (0x%08x) aligned\n",
		     obj->gtt_offset, obj->map_and_fenceable, size);
 
		if (obj->tiling_mode == I915_TILING_Y && HAS_128_BYTE_Y_TILING(dev))
			tile_width = 128;
		else
			tile_width = 512;
 
		/* Note: pitch better be a power of two tile widths */
		pitch_val = obj->stride / tile_width;
		pitch_val = ffs(pitch_val) - 1;
 
		val = obj->gtt_offset;
		if (obj->tiling_mode == I915_TILING_Y)
			val |= 1 << I830_FENCE_TILING_Y_SHIFT;
		val |= I915_FENCE_SIZE_BITS(size);
		val |= pitch_val << I830_FENCE_PITCH_SHIFT;
		val |= I830_FENCE_REG_VALID;
	} else
		val = 0;
 
	if (reg < 8)
		reg = FENCE_REG_830_0 + reg * 4;
	else
		reg = FENCE_REG_945_8 + (reg - 8) * 4;
 
	I915_WRITE(reg, val);
	POSTING_READ(reg);
}
 
static void i830_write_fence_reg(struct drm_device *dev, int reg,
				struct drm_i915_gem_object *obj)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	uint32_t val;
 
	if (obj) {
		u32 size = obj->gtt_space->size;
		uint32_t pitch_val;
 
		WARN((obj->gtt_offset & ~I830_FENCE_START_MASK) ||
		     (size & -size) != size ||
		     (obj->gtt_offset & (size - 1)),
		     "object 0x%08x not 512K or pot-size 0x%08x aligned\n",
		     obj->gtt_offset, size);
 
		pitch_val = obj->stride / 128;
		pitch_val = ffs(pitch_val) - 1;
 
		val = obj->gtt_offset;
		if (obj->tiling_mode == I915_TILING_Y)
			val |= 1 << I830_FENCE_TILING_Y_SHIFT;
		val |= I830_FENCE_SIZE_BITS(size);
		val |= pitch_val << I830_FENCE_PITCH_SHIFT;
		val |= I830_FENCE_REG_VALID;
	} else
		val = 0;
 
	I915_WRITE(FENCE_REG_830_0 + reg * 4, val);
	POSTING_READ(FENCE_REG_830_0 + reg * 4);
}
 
static void i915_gem_write_fence(struct drm_device *dev, int reg,
				 struct drm_i915_gem_object *obj)
{
	switch (INTEL_INFO(dev)->gen) {
	case 7:
	case 6: sandybridge_write_fence_reg(dev, reg, obj); break;
	case 5:
	case 4: i965_write_fence_reg(dev, reg, obj); break;
	case 3: i915_write_fence_reg(dev, reg, obj); break;
	case 2: i830_write_fence_reg(dev, reg, obj); break;
	default: break;
	}
}
 
static inline int fence_number(struct drm_i915_private *dev_priv,
			       struct drm_i915_fence_reg *fence)
{
	return fence - dev_priv->fence_regs;
}
 
static void i915_gem_object_update_fence(struct drm_i915_gem_object *obj,
					 struct drm_i915_fence_reg *fence,
					 bool enable)
{
	struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
	int reg = fence_number(dev_priv, fence);
 
	i915_gem_write_fence(obj->base.dev, reg, enable ? obj : NULL);
 
	if (enable) {
		obj->fence_reg = reg;
		fence->obj = obj;
		list_move_tail(&fence->lru_list, &dev_priv->mm.fence_list);
	} else {
		obj->fence_reg = I915_FENCE_REG_NONE;
		fence->obj = NULL;
		list_del_init(&fence->lru_list);
	}
}
 
static int
i915_gem_object_flush_fence(struct drm_i915_gem_object *obj)
{
	if (obj->last_fenced_seqno) {
		int ret = i915_wait_seqno(obj->ring, obj->last_fenced_seqno);
			if (ret)
				return ret;
 
		obj->last_fenced_seqno = 0;
	}
 
	/* Ensure that all CPU reads are completed before installing a fence
	 * and all writes before removing the fence.
	 */
	if (obj->base.read_domains & I915_GEM_DOMAIN_GTT)
		mb();
 
	obj->fenced_gpu_access = false;
	return 0;
}
 
int
i915_gem_object_put_fence(struct drm_i915_gem_object *obj)
{
	struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
	int ret;
 
	ret = i915_gem_object_flush_fence(obj);
	if (ret)
		return ret;
 
	if (obj->fence_reg == I915_FENCE_REG_NONE)
		return 0;
 
	i915_gem_object_update_fence(obj,
				     &dev_priv->fence_regs[obj->fence_reg],
				     false);
	i915_gem_object_fence_lost(obj);
 
	return 0;
}
 
static struct drm_i915_fence_reg *
i915_find_fence_reg(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct drm_i915_fence_reg *reg, *avail;
	int i;
 
	/* First try to find a free reg */
	avail = NULL;
	for (i = dev_priv->fence_reg_start; i < dev_priv->num_fence_regs; i++) {
		reg = &dev_priv->fence_regs[i];
		if (!reg->obj)
			return reg;
 
		if (!reg->pin_count)
			avail = reg;
	}
 
	if (avail == NULL)
		return NULL;
 
	/* None available, try to steal one or wait for a user to finish */
	list_for_each_entry(reg, &dev_priv->mm.fence_list, lru_list) {
		if (reg->pin_count)
			continue;
 
		return reg;
	}
 
	return NULL;
}
 
/**
 * i915_gem_object_get_fence - set up fencing for an object
 * @obj: object to map through a fence reg
 *
 * When mapping objects through the GTT, userspace wants to be able to write
 * to them without having to worry about swizzling if the object is tiled.
 * This function walks the fence regs looking for a free one for @obj,
 * stealing one if it can't find any.
 *
 * It then sets up the reg based on the object's properties: address, pitch
 * and tiling format.
 *
 * For an untiled surface, this removes any existing fence.
 */
int
i915_gem_object_get_fence(struct drm_i915_gem_object *obj)
{
	struct drm_device *dev = obj->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	bool enable = obj->tiling_mode != I915_TILING_NONE;
	struct drm_i915_fence_reg *reg;
	int ret;
 
	/* Have we updated the tiling parameters upon the object and so
	 * will need to serialise the write to the associated fence register?
	 */
	if (obj->fence_dirty) {
		ret = i915_gem_object_flush_fence(obj);
		if (ret)
			return ret;
	}
 
	/* Just update our place in the LRU if our fence is getting reused. */
	if (obj->fence_reg != I915_FENCE_REG_NONE) {
		reg = &dev_priv->fence_regs[obj->fence_reg];
		if (!obj->fence_dirty) {
			list_move_tail(®->lru_list,
				       &dev_priv->mm.fence_list);
			return 0;
		}
	} else if (enable) {
		reg = i915_find_fence_reg(dev);
		if (reg == NULL)
			return -EDEADLK;
 
		if (reg->obj) {
			struct drm_i915_gem_object *old = reg->obj;
 
			ret = i915_gem_object_flush_fence(old);
			if (ret)
				return ret;
 
			i915_gem_object_fence_lost(old);
		}
	} else
		return 0;
 
	i915_gem_object_update_fence(obj, reg, enable);
	obj->fence_dirty = false;
 
	return 0;
}
 
static bool i915_gem_valid_gtt_space(struct drm_device *dev,
				     struct drm_mm_node *gtt_space,
				     unsigned long cache_level)
{
	struct drm_mm_node *other;
 
	/* On non-LLC machines we have to be careful when putting differing
	 * types of snoopable memory together to avoid the prefetcher
	 * crossing memory domains and dieing.
	 */
	if (HAS_LLC(dev))
		return true;
 
	if (gtt_space == NULL)
		return true;
 
	if (list_empty(>t_space->node_list))
		return true;
 
	other = list_entry(gtt_space->node_list.prev, struct drm_mm_node, node_list);
	if (other->allocated && !other->hole_follows && other->color != cache_level)
		return false;
 
	other = list_entry(gtt_space->node_list.next, struct drm_mm_node, node_list);
	if (other->allocated && !gtt_space->hole_follows && other->color != cache_level)
		return false;
 
	return true;
}
 
static void i915_gem_verify_gtt(struct drm_device *dev)
{
#if WATCH_GTT
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct drm_i915_gem_object *obj;
	int err = 0;
 
	list_for_each_entry(obj, &dev_priv->mm.gtt_list, gtt_list) {
		if (obj->gtt_space == NULL) {
			printk(KERN_ERR "object found on GTT list with no space reserved\n");
			err++;
			continue;
		}
 
		if (obj->cache_level != obj->gtt_space->color) {
			printk(KERN_ERR "object reserved space [%08lx, %08lx] with wrong color, cache_level=%x, color=%lx\n",
			       obj->gtt_space->start,
			       obj->gtt_space->start + obj->gtt_space->size,
			       obj->cache_level,
			       obj->gtt_space->color);
			err++;
			continue;
		}
 
		if (!i915_gem_valid_gtt_space(dev,
					      obj->gtt_space,
					      obj->cache_level)) {
			printk(KERN_ERR "invalid GTT space found at [%08lx, %08lx] - color=%x\n",
			       obj->gtt_space->start,
			       obj->gtt_space->start + obj->gtt_space->size,
			       obj->cache_level);
			err++;
			continue;
		}
	}
 
	WARN_ON(err);
#endif
}
 
/**
 * Finds free space in the GTT aperture and binds the object there.
 */
static int
i915_gem_object_bind_to_gtt(struct drm_i915_gem_object *obj,
			    unsigned alignment,
			    bool map_and_fenceable,
			    bool nonblocking)
{
	struct drm_device *dev = obj->base.dev;
	drm_i915_private_t *dev_priv = dev->dev_private;
	struct drm_mm_node *node;
	u32 size, fence_size, fence_alignment, unfenced_alignment;
	bool mappable, fenceable;
	int ret;
 
	if (obj->madv != I915_MADV_WILLNEED) {
        DRM_ERROR("Attempting to bind a purgeable object\n");
		return -EINVAL;
	}
 
	fence_size = i915_gem_get_gtt_size(dev,
					   obj->base.size,
					   obj->tiling_mode);
	fence_alignment = i915_gem_get_gtt_alignment(dev,
						     obj->base.size,
						     obj->tiling_mode);
	unfenced_alignment =
		i915_gem_get_unfenced_gtt_alignment(dev,
						    obj->base.size,
						    obj->tiling_mode);
 
	if (alignment == 0)
		alignment = map_and_fenceable ? fence_alignment :
						unfenced_alignment;
	if (map_and_fenceable && alignment & (fence_alignment - 1)) {
		DRM_ERROR("Invalid object alignment requested %u\n", alignment);
		return -EINVAL;
	}
 
	size = map_and_fenceable ? fence_size : obj->base.size;
 
	/* If the object is bigger than the entire aperture, reject it early
	 * before evicting everything in a vain attempt to find space.
	 */
	if (obj->base.size >
	    (map_and_fenceable ? dev_priv->mm.gtt_mappable_end : dev_priv->mm.gtt_total)) {
		DRM_ERROR("Attempting to bind an object larger than the aperture\n");
		return -E2BIG;
	}
 
	ret = i915_gem_object_get_pages(obj);
	if (ret)
		return ret;
 
	i915_gem_object_pin_pages(obj);
 
	node = kzalloc(sizeof(*node), GFP_KERNEL);
	if (node == NULL) {
		i915_gem_object_unpin_pages(obj);
		return -ENOMEM;
	}
 
 search_free:
	if (map_and_fenceable)
		ret = drm_mm_insert_node_in_range_generic(&dev_priv->mm.gtt_space, node,
							  size, alignment, obj->cache_level,
							  0, dev_priv->mm.gtt_mappable_end);
	else
		ret = drm_mm_insert_node_generic(&dev_priv->mm.gtt_space, node,
						 size, alignment, obj->cache_level);
	if (ret) {
 
		i915_gem_object_unpin_pages(obj);
		kfree(node);
			return ret;
	}
	if (WARN_ON(!i915_gem_valid_gtt_space(dev, node, obj->cache_level))) {
		i915_gem_object_unpin_pages(obj);
		drm_mm_put_block(node);
		return -EINVAL;
	}
 
	ret = i915_gem_gtt_prepare_object(obj);
	if (ret) {
		i915_gem_object_unpin_pages(obj);
		drm_mm_put_block(node);
			return ret;
	}
 
	list_move_tail(&obj->gtt_list, &dev_priv->mm.bound_list);
	list_add_tail(&obj->mm_list, &dev_priv->mm.inactive_list);
 
	obj->gtt_space = node;
	obj->gtt_offset = node->start;
 
	fenceable =
		node->size == fence_size &&
		(node->start & (fence_alignment - 1)) == 0;
 
	mappable =
		obj->gtt_offset + obj->base.size <= dev_priv->mm.gtt_mappable_end;
 
	obj->map_and_fenceable = mappable && fenceable;
 
	i915_gem_object_unpin_pages(obj);
	trace_i915_gem_object_bind(obj, map_and_fenceable);
	i915_gem_verify_gtt(dev);
	return 0;
}
 
void
i915_gem_clflush_object(struct drm_i915_gem_object *obj)
{
	/* If we don't have a page list set up, then we're not pinned
	 * to GPU, and we can ignore the cache flush because it'll happen
	 * again at bind time.
	 */
	if (obj->pages == NULL)
		return;
 
	/* If the GPU is snooping the contents of the CPU cache,
	 * we do not need to manually clear the CPU cache lines.  However,
	 * the caches are only snooped when the render cache is
	 * flushed/invalidated.  As we always have to emit invalidations
	 * and flushes when moving into and out of the RENDER domain, correct
	 * snooping behaviour occurs naturally as the result of our domain
	 * tracking.
	 */
	if (obj->cache_level != I915_CACHE_NONE)
		return;
#if 0
     if(obj->mapped != NULL)
     {
        uint8_t *page_virtual;
        unsigned int i;
 
        page_virtual = obj->mapped;
        asm volatile("mfence");
        for (i = 0; i < obj->base.size; i += x86_clflush_size)
            clflush(page_virtual + i);
        asm volatile("mfence");
     }
     else
     {
        uint8_t *page_virtual;
        unsigned int i;
        page_virtual = AllocKernelSpace(obj->base.size);
        if(page_virtual != NULL)
        {
            dma_addr_t *src, *dst;
            u32 count;
 
#define page_tabs  0xFDC00000      /* really dirty hack */
 
            src =  obj->pages.page;
            dst =  &((dma_addr_t*)page_tabs)[(u32_t)page_virtual >> 12];
            count = obj->base.size/4096;
 
            while(count--)
            {
                *dst++ = (0xFFFFF000 & *src++) | 0x001 ;
            };
 
            asm volatile("mfence");
            for (i = 0; i < obj->base.size; i += x86_clflush_size)
                clflush(page_virtual + i);
            asm volatile("mfence");
            FreeKernelSpace(page_virtual);
        }
        else
        {
            asm volatile (
            "mfence         \n"
            "wbinvd         \n"                 /* this is really ugly  */
            "mfence");
        }
     }
#endif
 
}
 
/** Flushes the GTT write domain for the object if it's dirty. */
static void
i915_gem_object_flush_gtt_write_domain(struct drm_i915_gem_object *obj)
{
	uint32_t old_write_domain;
 
	if (obj->base.write_domain != I915_GEM_DOMAIN_GTT)
		return;
 
	/* No actual flushing is required for the GTT write domain.  Writes
	 * to it immediately go to main memory as far as we know, so there's
	 * no chipset flush.  It also doesn't land in render cache.
	 *
	 * However, we do have to enforce the order so that all writes through
	 * the GTT land before any writes to the device, such as updates to
	 * the GATT itself.
	 */
	wmb();
 
	old_write_domain = obj->base.write_domain;
	obj->base.write_domain = 0;
 
	trace_i915_gem_object_change_domain(obj,
					    obj->base.read_domains,
					    old_write_domain);
}
 
/** Flushes the CPU write domain for the object if it's dirty. */
static void
i915_gem_object_flush_cpu_write_domain(struct drm_i915_gem_object *obj)
{
	uint32_t old_write_domain;
 
	if (obj->base.write_domain != I915_GEM_DOMAIN_CPU)
		return;
 
	i915_gem_clflush_object(obj);
	i915_gem_chipset_flush(obj->base.dev);
	old_write_domain = obj->base.write_domain;
	obj->base.write_domain = 0;
 
	trace_i915_gem_object_change_domain(obj,
					    obj->base.read_domains,
					    old_write_domain);
}
 
/**
 * Moves a single object to the GTT read, and possibly write domain.
 *
 * This function returns when the move is complete, including waiting on
 * flushes to occur.
 */
int
i915_gem_object_set_to_gtt_domain(struct drm_i915_gem_object *obj, bool write)
{
	drm_i915_private_t *dev_priv = obj->base.dev->dev_private;
	uint32_t old_write_domain, old_read_domains;
	int ret;
 
	/* Not valid to be called on unbound objects. */
	if (obj->gtt_space == NULL)
		return -EINVAL;
 
	if (obj->base.write_domain == I915_GEM_DOMAIN_GTT)
		return 0;
 
	ret = i915_gem_object_wait_rendering(obj, !write);
		if (ret)
			return ret;
 
	i915_gem_object_flush_cpu_write_domain(obj);
 
	old_write_domain = obj->base.write_domain;
	old_read_domains = obj->base.read_domains;
 
	/* It should now be out of any other write domains, and we can update
	 * the domain values for our changes.
	 */
	BUG_ON((obj->base.write_domain & ~I915_GEM_DOMAIN_GTT) != 0);
	obj->base.read_domains |= I915_GEM_DOMAIN_GTT;
	if (write) {
		obj->base.read_domains = I915_GEM_DOMAIN_GTT;
		obj->base.write_domain = I915_GEM_DOMAIN_GTT;
		obj->dirty = 1;
	}
 
	trace_i915_gem_object_change_domain(obj,
					    old_read_domains,
					    old_write_domain);
 
	/* And bump the LRU for this access */
	if (i915_gem_object_is_inactive(obj))
		list_move_tail(&obj->mm_list, &dev_priv->mm.inactive_list);
 
	return 0;
}
 
int i915_gem_object_set_cache_level(struct drm_i915_gem_object *obj,
				    enum i915_cache_level cache_level)
{
	struct drm_device *dev = obj->base.dev;
	drm_i915_private_t *dev_priv = dev->dev_private;
	int ret;
 
	if (obj->cache_level == cache_level)
		return 0;
 
	if (obj->pin_count) {
		DRM_DEBUG("can not change the cache level of pinned objects\n");
		return -EBUSY;
	}
 
	if (!i915_gem_valid_gtt_space(dev, obj->gtt_space, cache_level)) {
		ret = i915_gem_object_unbind(obj);
		if (ret)
			return ret;
	}
 
	if (obj->gtt_space) {
		ret = i915_gem_object_finish_gpu(obj);
		if (ret)
			return ret;
 
		i915_gem_object_finish_gtt(obj);
 
		/* Before SandyBridge, you could not use tiling or fence
		 * registers with snooped memory, so relinquish any fences
		 * currently pointing to our region in the aperture.
		 */
		if (INTEL_INFO(dev)->gen < 6) {
			ret = i915_gem_object_put_fence(obj);
			if (ret)
				return ret;
		}
 
		if (obj->has_global_gtt_mapping)
			i915_gem_gtt_bind_object(obj, cache_level);
		if (obj->has_aliasing_ppgtt_mapping)
			i915_ppgtt_bind_object(dev_priv->mm.aliasing_ppgtt,
					       obj, cache_level);
 
		obj->gtt_space->color = cache_level;
	}
 
	if (cache_level == I915_CACHE_NONE) {
		u32 old_read_domains, old_write_domain;
 
		/* If we're coming from LLC cached, then we haven't
		 * actually been tracking whether the data is in the
		 * CPU cache or not, since we only allow one bit set
		 * in obj->write_domain and have been skipping the clflushes.
		 * Just set it to the CPU cache for now.
		 */
		WARN_ON(obj->base.write_domain & ~I915_GEM_DOMAIN_CPU);
		WARN_ON(obj->base.read_domains & ~I915_GEM_DOMAIN_CPU);
 
		old_read_domains = obj->base.read_domains;
		old_write_domain = obj->base.write_domain;
 
		obj->base.read_domains = I915_GEM_DOMAIN_CPU;
		obj->base.write_domain = I915_GEM_DOMAIN_CPU;
 
		trace_i915_gem_object_change_domain(obj,
						    old_read_domains,
						    old_write_domain);
    }
 
	obj->cache_level = cache_level;
	i915_gem_verify_gtt(dev);
	return 0;
}
 
int i915_gem_get_caching_ioctl(struct drm_device *dev, void *data,
			       struct drm_file *file)
{
	struct drm_i915_gem_caching *args = data;
	struct drm_i915_gem_object *obj;
	int ret;
 
	ret = i915_mutex_lock_interruptible(dev);
	if (ret)
		return ret;
 
	obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
	if (&obj->base == NULL) {
		ret = -ENOENT;
		goto unlock;
	}
 
	args->caching = obj->cache_level != I915_CACHE_NONE;
 
	drm_gem_object_unreference(&obj->base);
unlock:
	mutex_unlock(&dev->struct_mutex);
	return ret;
}
 
int i915_gem_set_caching_ioctl(struct drm_device *dev, void *data,
			       struct drm_file *file)
{
	struct drm_i915_gem_caching *args = data;
	struct drm_i915_gem_object *obj;
	enum i915_cache_level level;
	int ret;
 
	switch (args->caching) {
	case I915_CACHING_NONE:
		level = I915_CACHE_NONE;
		break;
	case I915_CACHING_CACHED:
		level = I915_CACHE_LLC;
		break;
	default:
		return -EINVAL;
	}
 
	ret = i915_mutex_lock_interruptible(dev);
	if (ret)
		return ret;
 
	obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
	if (&obj->base == NULL) {
		ret = -ENOENT;
		goto unlock;
	}
 
	ret = i915_gem_object_set_cache_level(obj, level);
 
	drm_gem_object_unreference(&obj->base);
unlock:
	mutex_unlock(&dev->struct_mutex);
	return ret;
}
 
/*
 * Prepare buffer for display plane (scanout, cursors, etc).
 * Can be called from an uninterruptible phase (modesetting) and allows
 * any flushes to be pipelined (for pageflips).
 */
int
i915_gem_object_pin_to_display_plane(struct drm_i915_gem_object *obj,
				     u32 alignment,
				     struct intel_ring_buffer *pipelined)
{
	u32 old_read_domains, old_write_domain;
	int ret;
 
	if (pipelined != obj->ring) {
		ret = i915_gem_object_sync(obj, pipelined);
	if (ret)
		return ret;
	}
 
	/* The display engine is not coherent with the LLC cache on gen6.  As
	 * a result, we make sure that the pinning that is about to occur is
	 * done with uncached PTEs. This is lowest common denominator for all
	 * chipsets.
	 *
	 * However for gen6+, we could do better by using the GFDT bit instead
	 * of uncaching, which would allow us to flush all the LLC-cached data
	 * with that bit in the PTE to main memory with just one PIPE_CONTROL.
	 */
	ret = i915_gem_object_set_cache_level(obj, I915_CACHE_NONE);
	if (ret)
		return ret;
 
	/* As the user may map the buffer once pinned in the display plane
	 * (e.g. libkms for the bootup splash), we have to ensure that we
	 * always use map_and_fenceable for all scanout buffers.
	 */
	ret = i915_gem_object_pin(obj, alignment, true, false);
	if (ret)
		return ret;
 
	i915_gem_object_flush_cpu_write_domain(obj);
 
	old_write_domain = obj->base.write_domain;
	old_read_domains = obj->base.read_domains;
 
	/* It should now be out of any other write domains, and we can update
	 * the domain values for our changes.
	 */
	obj->base.write_domain = 0;
	obj->base.read_domains |= I915_GEM_DOMAIN_GTT;
 
	trace_i915_gem_object_change_domain(obj,
					    old_read_domains,
					    old_write_domain);
 
	return 0;
}
 
int
i915_gem_object_finish_gpu(struct drm_i915_gem_object *obj)
{
	int ret;
 
	if ((obj->base.read_domains & I915_GEM_GPU_DOMAINS) == 0)
		return 0;
 
	ret = i915_gem_object_wait_rendering(obj, false);
    if (ret)
        return ret;
 
	/* Ensure that we invalidate the GPU's caches and TLBs. */
	obj->base.read_domains &= ~I915_GEM_GPU_DOMAINS;
	return 0;
}
 
/**
 * Moves a single object to the CPU read, and possibly write domain.
 *
 * This function returns when the move is complete, including waiting on
 * flushes to occur.
 */
int
i915_gem_object_set_to_cpu_domain(struct drm_i915_gem_object *obj, bool write)
{
	uint32_t old_write_domain, old_read_domains;
	int ret;
 
	if (obj->base.write_domain == I915_GEM_DOMAIN_CPU)
		return 0;
 
	ret = i915_gem_object_wait_rendering(obj, !write);
	if (ret)
		return ret;
 
	i915_gem_object_flush_gtt_write_domain(obj);
 
	old_write_domain = obj->base.write_domain;
	old_read_domains = obj->base.read_domains;
 
	/* Flush the CPU cache if it's still invalid. */
	if ((obj->base.read_domains & I915_GEM_DOMAIN_CPU) == 0) {
		i915_gem_clflush_object(obj);
 
		obj->base.read_domains |= I915_GEM_DOMAIN_CPU;
	}
 
	/* It should now be out of any other write domains, and we can update
	 * the domain values for our changes.
	 */
	BUG_ON((obj->base.write_domain & ~I915_GEM_DOMAIN_CPU) != 0);
 
	/* If we're writing through the CPU, then the GPU read domains will
	 * need to be invalidated at next use.
	 */
	if (write) {
		obj->base.read_domains = I915_GEM_DOMAIN_CPU;
		obj->base.write_domain = I915_GEM_DOMAIN_CPU;
	}
 
	trace_i915_gem_object_change_domain(obj,
					    old_read_domains,
					    old_write_domain);
 
	return 0;
}
 
/* Throttle our rendering by waiting until the ring has completed our requests
 * emitted over 20 msec ago.
 *
 * Note that if we were to use the current jiffies each time around the loop,
 * we wouldn't escape the function with any frames outstanding if the time to
 * render a frame was over 20ms.
 *
 * This should get us reasonable parallelism between CPU and GPU but also
 * relatively low latency when blocking on a particular request to finish.
 */
static int
i915_gem_ring_throttle(struct drm_device *dev, struct drm_file *file)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct drm_i915_file_private *file_priv = file->driver_priv;
	unsigned long recent_enough = GetTimerTicks() - msecs_to_jiffies(20);
	struct drm_i915_gem_request *request;
	struct intel_ring_buffer *ring = NULL;
	u32 seqno = 0;
	int ret;
 
	if (atomic_read(&dev_priv->mm.wedged))
		return -EIO;
 
	spin_lock(&file_priv->mm.lock);
	list_for_each_entry(request, &file_priv->mm.request_list, client_list) {
		if (time_after_eq(request->emitted_jiffies, recent_enough))
			break;
 
		ring = request->ring;
		seqno = request->seqno;
	}
	spin_unlock(&file_priv->mm.lock);
 
	if (seqno == 0)
		return 0;
 
	ret = __wait_seqno(ring, seqno, true, NULL);
	if (ret == 0)
		queue_delayed_work(dev_priv->wq, &dev_priv->mm.retire_work, 0);
 
	return ret;
}
 
int
i915_gem_object_pin(struct drm_i915_gem_object *obj,
		    uint32_t alignment,
		    bool map_and_fenceable,
		    bool nonblocking)
{
	int ret;
 
	if (WARN_ON(obj->pin_count == DRM_I915_GEM_OBJECT_MAX_PIN_COUNT))
		return -EBUSY;
 
	if (obj->gtt_space != NULL) {
		if ((alignment && obj->gtt_offset & (alignment - 1)) ||
		    (map_and_fenceable && !obj->map_and_fenceable)) {
			WARN(obj->pin_count,
			     "bo is already pinned with incorrect alignment:"
			     " offset=%x, req.alignment=%x, req.map_and_fenceable=%d,"
			     " obj->map_and_fenceable=%d\n",
			     obj->gtt_offset, alignment,
			     map_and_fenceable,
			     obj->map_and_fenceable);
			ret = i915_gem_object_unbind(obj);
			if (ret)
				return ret;
		}
	}
 
	if (obj->gtt_space == NULL) {
		struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
 
		ret = i915_gem_object_bind_to_gtt(obj, alignment,
						  map_and_fenceable,
						  nonblocking);
		if (ret)
			return ret;
 
		if (!dev_priv->mm.aliasing_ppgtt)
			i915_gem_gtt_bind_object(obj, obj->cache_level);
	}
 
	if (!obj->has_global_gtt_mapping && map_and_fenceable)
		i915_gem_gtt_bind_object(obj, obj->cache_level);
 
	obj->pin_count++;
	obj->pin_mappable |= map_and_fenceable;
 
	return 0;
}
 
void
i915_gem_object_unpin(struct drm_i915_gem_object *obj)
{
	BUG_ON(obj->pin_count == 0);
	BUG_ON(obj->gtt_space == NULL);
 
	if (--obj->pin_count == 0)
		obj->pin_mappable = false;
}
 
int
i915_gem_pin_ioctl(struct drm_device *dev, void *data,
		   struct drm_file *file)
{
	struct drm_i915_gem_pin *args = data;
	struct drm_i915_gem_object *obj;
	int ret;
 
	ret = i915_mutex_lock_interruptible(dev);
	if (ret)
		return ret;
 
	obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
	if (&obj->base == NULL) {
		ret = -ENOENT;
		goto unlock;
	}
 
	if (obj->madv != I915_MADV_WILLNEED) {
		DRM_ERROR("Attempting to pin a purgeable buffer\n");
		ret = -EINVAL;
		goto out;
	}
 
	if (obj->pin_filp != NULL && obj->pin_filp != file) {
		DRM_ERROR("Already pinned in i915_gem_pin_ioctl(): %d\n",
			  args->handle);
		ret = -EINVAL;
		goto out;
	}
 
	if (obj->user_pin_count == 0) {
		ret = i915_gem_object_pin(obj, args->alignment, true, false);
		if (ret)
			goto out;
	}
 
	obj->user_pin_count++;
	obj->pin_filp = file;
 
	/* XXX - flush the CPU caches for pinned objects
	 * as the X server doesn't manage domains yet
	 */
	i915_gem_object_flush_cpu_write_domain(obj);
	args->offset = obj->gtt_offset;
out:
	drm_gem_object_unreference(&obj->base);
unlock:
	mutex_unlock(&dev->struct_mutex);
	return ret;
}
 
#if 0
 
int
i915_gem_unpin_ioctl(struct drm_device *dev, void *data,
		     struct drm_file *file)
{
	struct drm_i915_gem_pin *args = data;
	struct drm_i915_gem_object *obj;
	int ret;
 
	ret = i915_mutex_lock_interruptible(dev);
	if (ret)
		return ret;
 
	obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
	if (&obj->base == NULL) {
		ret = -ENOENT;
		goto unlock;
	}
 
	if (obj->pin_filp != file) {
		DRM_ERROR("Not pinned by caller in i915_gem_pin_ioctl(): %d\n",
			  args->handle);
		ret = -EINVAL;
		goto out;
	}
	obj->user_pin_count--;
	if (obj->user_pin_count == 0) {
		obj->pin_filp = NULL;
		i915_gem_object_unpin(obj);
	}
 
out:
	drm_gem_object_unreference(&obj->base);
unlock:
	mutex_unlock(&dev->struct_mutex);
	return ret;
}
 
#endif
 
int
i915_gem_busy_ioctl(struct drm_device *dev, void *data,
		    struct drm_file *file)
{
	struct drm_i915_gem_busy *args = data;
	struct drm_i915_gem_object *obj;
	int ret;
 
	ret = i915_mutex_lock_interruptible(dev);
	if (ret)
		return ret;
 
	obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
	if (&obj->base == NULL) {
		ret = -ENOENT;
		goto unlock;
	}
 
	/* Count all active objects as busy, even if they are currently not used
	 * by the gpu. Users of this interface expect objects to eventually
	 * become non-busy without any further actions, therefore emit any
	 * necessary flushes here.
	 */
	ret = i915_gem_object_flush_active(obj);
 
	args->busy = obj->active;
	if (obj->ring) {
		BUILD_BUG_ON(I915_NUM_RINGS > 16);
		args->busy |= intel_ring_flag(obj->ring) << 16;
	}
 
	drm_gem_object_unreference(&obj->base);
unlock:
	mutex_unlock(&dev->struct_mutex);
	return ret;
}
 
int
i915_gem_throttle_ioctl(struct drm_device *dev, void *data,
			struct drm_file *file_priv)
{
	return i915_gem_ring_throttle(dev, file_priv);
}
 
#if 0
 
int
i915_gem_madvise_ioctl(struct drm_device *dev, void *data,
		       struct drm_file *file_priv)
{
	struct drm_i915_gem_madvise *args = data;
	struct drm_i915_gem_object *obj;
	int ret;
 
	switch (args->madv) {
	case I915_MADV_DONTNEED:
	case I915_MADV_WILLNEED:
	    break;
	default:
	    return -EINVAL;
	}
 
	ret = i915_mutex_lock_interruptible(dev);
	if (ret)
		return ret;
 
	obj = to_intel_bo(drm_gem_object_lookup(dev, file_priv, args->handle));
	if (&obj->base == NULL) {
		ret = -ENOENT;
		goto unlock;
	}
 
	if (obj->pin_count) {
		ret = -EINVAL;
		goto out;
	}
 
	if (obj->madv != __I915_MADV_PURGED)
		obj->madv = args->madv;
 
	/* if the object is no longer attached, discard its backing storage */
	if (i915_gem_object_is_purgeable(obj) && obj->pages == NULL)
		i915_gem_object_truncate(obj);
 
	args->retained = obj->madv != __I915_MADV_PURGED;
 
out:
	drm_gem_object_unreference(&obj->base);
unlock:
	mutex_unlock(&dev->struct_mutex);
	return ret;
}
#endif
 
void i915_gem_object_init(struct drm_i915_gem_object *obj,
			  const struct drm_i915_gem_object_ops *ops)
{
	INIT_LIST_HEAD(&obj->mm_list);
	INIT_LIST_HEAD(&obj->gtt_list);
	INIT_LIST_HEAD(&obj->ring_list);
	INIT_LIST_HEAD(&obj->exec_list);
 
	obj->ops = ops;
 
	obj->fence_reg = I915_FENCE_REG_NONE;
	obj->madv = I915_MADV_WILLNEED;
	/* Avoid an unnecessary call to unbind on the first bind. */
	obj->map_and_fenceable = true;
 
	i915_gem_info_add_obj(obj->base.dev->dev_private, obj->base.size);
}
 
static const struct drm_i915_gem_object_ops i915_gem_object_ops = {
	.get_pages = i915_gem_object_get_pages_gtt,
	.put_pages = i915_gem_object_put_pages_gtt,
};
 
struct drm_i915_gem_object *i915_gem_alloc_object(struct drm_device *dev,
						  size_t size)
{
	struct drm_i915_gem_object *obj;
	struct address_space *mapping;
	u32 mask;
 
	obj = kzalloc(sizeof(*obj), GFP_KERNEL);
	if (obj == NULL)
		return NULL;
 
	if (drm_gem_object_init(dev, &obj->base, size) != 0) {
		kfree(obj);
		return NULL;
	}
 
 
	i915_gem_object_init(obj, &i915_gem_object_ops);
 
	obj->base.write_domain = I915_GEM_DOMAIN_CPU;
	obj->base.read_domains = I915_GEM_DOMAIN_CPU;
 
	if (HAS_LLC(dev)) {
		/* On some devices, we can have the GPU use the LLC (the CPU
		 * cache) for about a 10% performance improvement
		 * compared to uncached.  Graphics requests other than
		 * display scanout are coherent with the CPU in
		 * accessing this cache.  This means in this mode we
		 * don't need to clflush on the CPU side, and on the
		 * GPU side we only need to flush internal caches to
		 * get data visible to the CPU.
		 *
		 * However, we maintain the display planes as UC, and so
		 * need to rebind when first used as such.
		 */
		obj->cache_level = I915_CACHE_LLC;
	} else
		obj->cache_level = I915_CACHE_NONE;
 
	return obj;
}
 
int i915_gem_init_object(struct drm_gem_object *obj)
{
	BUG();
 
	return 0;
}
 
void i915_gem_free_object(struct drm_gem_object *gem_obj)
{
	struct drm_i915_gem_object *obj = to_intel_bo(gem_obj);
	struct drm_device *dev = obj->base.dev;
	drm_i915_private_t *dev_priv = dev->dev_private;
 
	trace_i915_gem_object_destroy(obj);
 
//   if (obj->phys_obj)
//       i915_gem_detach_phys_object(dev, obj);
//    printf("%s obj %p\n", __FUNCTION__, obj);
 
	obj->pin_count = 0;
	if (WARN_ON(i915_gem_object_unbind(obj) == -ERESTARTSYS)) {
		bool was_interruptible;
 
		was_interruptible = dev_priv->mm.interruptible;
		dev_priv->mm.interruptible = false;
 
		WARN_ON(i915_gem_object_unbind(obj));
 
		dev_priv->mm.interruptible = was_interruptible;
	}
 
	obj->pages_pin_count = 0;
	i915_gem_object_put_pages(obj);
//   i915_gem_object_free_mmap_offset(obj);
 
	BUG_ON(obj->pages);
 
//   if (obj->base.import_attach)
//       drm_prime_gem_destroy(&obj->base, NULL);
 
    if(obj->base.filp != NULL)
    {
//        printf("filp %p\n", obj->base.filp);
        shmem_file_delete(obj->base.filp);
    }
 
	drm_gem_object_release(&obj->base);
	i915_gem_info_remove_obj(dev_priv, obj->base.size);
 
	kfree(obj->bit_17);
	kfree(obj);
}
 
#if 0
int
i915_gem_idle(struct drm_device *dev)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	int ret;
 
	mutex_lock(&dev->struct_mutex);
 
	if (dev_priv->mm.suspended) {
		mutex_unlock(&dev->struct_mutex);
		return 0;
	}
 
	ret = i915_gpu_idle(dev);
	if (ret) {
		mutex_unlock(&dev->struct_mutex);
		return ret;
	}
	i915_gem_retire_requests(dev);
 
	i915_gem_reset_fences(dev);
 
	/* Hack!  Don't let anybody do execbuf while we don't control the chip.
	 * We need to replace this with a semaphore, or something.
	 * And not confound mm.suspended!
	 */
	dev_priv->mm.suspended = 1;
	del_timer_sync(&dev_priv->hangcheck_timer);
 
	i915_kernel_lost_context(dev);
	i915_gem_cleanup_ringbuffer(dev);
 
	mutex_unlock(&dev->struct_mutex);
 
	/* Cancel the retire work handler, which should be idle now. */
	cancel_delayed_work_sync(&dev_priv->mm.retire_work);
 
	return 0;
}
#endif
 
void i915_gem_l3_remap(struct drm_device *dev)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	u32 misccpctl;
	int i;
 
	if (!IS_IVYBRIDGE(dev))
		return;
 
	if (!dev_priv->l3_parity.remap_info)
		return;
 
	misccpctl = I915_READ(GEN7_MISCCPCTL);
	I915_WRITE(GEN7_MISCCPCTL, misccpctl & ~GEN7_DOP_CLOCK_GATE_ENABLE);
	POSTING_READ(GEN7_MISCCPCTL);
 
	for (i = 0; i < GEN7_L3LOG_SIZE; i += 4) {
		u32 remap = I915_READ(GEN7_L3LOG_BASE + i);
		if (remap && remap != dev_priv->l3_parity.remap_info[i/4])
			DRM_DEBUG("0x%x was already programmed to %x\n",
				  GEN7_L3LOG_BASE + i, remap);
		if (remap && !dev_priv->l3_parity.remap_info[i/4])
			DRM_DEBUG_DRIVER("Clearing remapped register\n");
		I915_WRITE(GEN7_L3LOG_BASE + i, dev_priv->l3_parity.remap_info[i/4]);
	}
 
	/* Make sure all the writes land before disabling dop clock gating */
	POSTING_READ(GEN7_L3LOG_BASE);
 
	I915_WRITE(GEN7_MISCCPCTL, misccpctl);
}
 
void i915_gem_init_swizzling(struct drm_device *dev)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
 
	if (INTEL_INFO(dev)->gen < 5 ||
	    dev_priv->mm.bit_6_swizzle_x == I915_BIT_6_SWIZZLE_NONE)
		return;
 
	I915_WRITE(DISP_ARB_CTL, I915_READ(DISP_ARB_CTL) |
				 DISP_TILE_SURFACE_SWIZZLING);
 
	if (IS_GEN5(dev))
		return;
 
	I915_WRITE(TILECTL, I915_READ(TILECTL) | TILECTL_SWZCTL);
	if (IS_GEN6(dev))
		I915_WRITE(ARB_MODE, _MASKED_BIT_ENABLE(ARB_MODE_SWIZZLE_SNB));
	else
		I915_WRITE(ARB_MODE, _MASKED_BIT_ENABLE(ARB_MODE_SWIZZLE_IVB));
}
 
static bool
intel_enable_blt(struct drm_device *dev)
{
	if (!HAS_BLT(dev))
		return false;
 
	/* The blitter was dysfunctional on early prototypes */
	if (IS_GEN6(dev) && dev->pdev->revision < 8) {
		DRM_INFO("BLT not supported on this pre-production hardware;"
			 " graphics performance will be degraded.\n");
		return false;
	}
 
	return true;
}
 
int
i915_gem_init_hw(struct drm_device *dev)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	int ret;
 
	if (INTEL_INFO(dev)->gen < 6 && !intel_enable_gtt())
		return -EIO;
 
	if (IS_HASWELL(dev) && (I915_READ(0x120010) == 1))
		I915_WRITE(0x9008, I915_READ(0x9008) | 0xf0000);
 
	i915_gem_l3_remap(dev);
 
	i915_gem_init_swizzling(dev);
 
	ret = intel_init_render_ring_buffer(dev);
	if (ret)
		return ret;
 
    if (HAS_BSD(dev)) {
		ret = intel_init_bsd_ring_buffer(dev);
		if (ret)
			goto cleanup_render_ring;
	}
 
	if (intel_enable_blt(dev)) {
		ret = intel_init_blt_ring_buffer(dev);
		if (ret)
			goto cleanup_bsd_ring;
	}
 
	dev_priv->next_seqno = 1;
 
	/*
	 * XXX: There was some w/a described somewhere suggesting loading
	 * contexts before PPGTT.
	 */
	i915_gem_context_init(dev);
	i915_gem_init_ppgtt(dev);
 
	return 0;
 
cleanup_bsd_ring:
	intel_cleanup_ring_buffer(&dev_priv->ring[VCS]);
cleanup_render_ring:
	intel_cleanup_ring_buffer(&dev_priv->ring[RCS]);
	return ret;
}
 
static bool
intel_enable_ppgtt(struct drm_device *dev)
{
	if (i915_enable_ppgtt >= 0)
		return i915_enable_ppgtt;
 
#ifdef CONFIG_INTEL_IOMMU
	/* Disable ppgtt on SNB if VT-d is on. */
	if (INTEL_INFO(dev)->gen == 6 && intel_iommu_gfx_mapped)
		return false;
#endif
 
	return true;
}
 
#define LFB_SIZE 0xC00000
 
int i915_gem_init(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	unsigned long gtt_size, mappable_size;
	int ret;
 
	gtt_size = dev_priv->mm.gtt->gtt_total_entries << PAGE_SHIFT;
	mappable_size = dev_priv->mm.gtt->gtt_mappable_entries << PAGE_SHIFT;
 
	mutex_lock(&dev->struct_mutex);
	if (intel_enable_ppgtt(dev) && HAS_ALIASING_PPGTT(dev)) {
		/* PPGTT pdes are stolen from global gtt ptes, so shrink the
		 * aperture accordingly when using aliasing ppgtt. */
		gtt_size -= I915_PPGTT_PD_ENTRIES*PAGE_SIZE;
 
        i915_gem_init_global_gtt(dev, LFB_SIZE, mappable_size, gtt_size - LFB_SIZE);
 
		ret = i915_gem_init_aliasing_ppgtt(dev);
		if (ret) {
			mutex_unlock(&dev->struct_mutex);
			return ret;
		}
	} else {
		/* Let GEM Manage all of the aperture.
		 *
		 * However, leave one page at the end still bound to the scratch
		 * page.  There are a number of places where the hardware
		 * apparently prefetches past the end of the object, and we've
		 * seen multiple hangs with the GPU head pointer stuck in a
		 * batchbuffer bound at the last page of the aperture.  One page
		 * should be enough to keep any prefetching inside of the
		 * aperture.
		 */
        i915_gem_init_global_gtt(dev, LFB_SIZE, mappable_size, gtt_size - LFB_SIZE);
	}
 
	ret = i915_gem_init_hw(dev);
	mutex_unlock(&dev->struct_mutex);
	if (ret) {
		i915_gem_cleanup_aliasing_ppgtt(dev);
		return ret;
	}
 
    return 0;
}
 
void
i915_gem_cleanup_ringbuffer(struct drm_device *dev)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	struct intel_ring_buffer *ring;
	int i;
 
	for_each_ring(ring, dev_priv, i)
		intel_cleanup_ring_buffer(ring);
}
 
#if 0
 
int
i915_gem_entervt_ioctl(struct drm_device *dev, void *data,
		       struct drm_file *file_priv)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	int ret;
 
	if (drm_core_check_feature(dev, DRIVER_MODESET))
		return 0;
 
	if (atomic_read(&dev_priv->mm.wedged)) {
		DRM_ERROR("Reenabling wedged hardware, good luck\n");
		atomic_set(&dev_priv->mm.wedged, 0);
	}
 
	mutex_lock(&dev->struct_mutex);
	dev_priv->mm.suspended = 0;
 
	ret = i915_gem_init_hw(dev);
	if (ret != 0) {
		mutex_unlock(&dev->struct_mutex);
		return ret;
	}
 
	BUG_ON(!list_empty(&dev_priv->mm.active_list));
	mutex_unlock(&dev->struct_mutex);
 
	ret = drm_irq_install(dev);
	if (ret)
		goto cleanup_ringbuffer;
 
	return 0;
 
cleanup_ringbuffer:
	mutex_lock(&dev->struct_mutex);
	i915_gem_cleanup_ringbuffer(dev);
	dev_priv->mm.suspended = 1;
	mutex_unlock(&dev->struct_mutex);
 
	return ret;
}
 
int
i915_gem_leavevt_ioctl(struct drm_device *dev, void *data,
		       struct drm_file *file_priv)
{
	if (drm_core_check_feature(dev, DRIVER_MODESET))
		return 0;
 
	drm_irq_uninstall(dev);
	return i915_gem_idle(dev);
}
 
void
i915_gem_lastclose(struct drm_device *dev)
{
	int ret;
 
	if (drm_core_check_feature(dev, DRIVER_MODESET))
		return;
 
	ret = i915_gem_idle(dev);
	if (ret)
		DRM_ERROR("failed to idle hardware: %d\n", ret);
}
#endif
 
static void
init_ring_lists(struct intel_ring_buffer *ring)
{
    INIT_LIST_HEAD(&ring->active_list);
    INIT_LIST_HEAD(&ring->request_list);
}
 
void
i915_gem_load(struct drm_device *dev)
{
    int i;
    drm_i915_private_t *dev_priv = dev->dev_private;
 
    INIT_LIST_HEAD(&dev_priv->mm.active_list);
    INIT_LIST_HEAD(&dev_priv->mm.inactive_list);
	INIT_LIST_HEAD(&dev_priv->mm.unbound_list);
	INIT_LIST_HEAD(&dev_priv->mm.bound_list);
    INIT_LIST_HEAD(&dev_priv->mm.fence_list);
    for (i = 0; i < I915_NUM_RINGS; i++)
        init_ring_lists(&dev_priv->ring[i]);
	for (i = 0; i < I915_MAX_NUM_FENCES; i++)
        INIT_LIST_HEAD(&dev_priv->fence_regs[i].lru_list);
	INIT_DELAYED_WORK(&dev_priv->mm.retire_work,
			  i915_gem_retire_work_handler);
 
    /* On GEN3 we really need to make sure the ARB C3 LP bit is set */
    if (IS_GEN3(dev)) {
		I915_WRITE(MI_ARB_STATE,
			   _MASKED_BIT_ENABLE(MI_ARB_C3_LP_WRITE_ENABLE));
    }
 
    dev_priv->relative_constants_mode = I915_EXEC_CONSTANTS_REL_GENERAL;
 
    if (INTEL_INFO(dev)->gen >= 4 || IS_I945G(dev) || IS_I945GM(dev) || IS_G33(dev))
        dev_priv->num_fence_regs = 16;
    else
        dev_priv->num_fence_regs = 8;
 
    /* Initialize fence registers to zero */
	i915_gem_reset_fences(dev);
 
    i915_gem_detect_bit_6_swizzle(dev);
 
    dev_priv->mm.interruptible = true;
 
//    dev_priv->mm.inactive_shrinker.shrink = i915_gem_inactive_shrink;
//    dev_priv->mm.inactive_shrinker.seeks = DEFAULT_SEEKS;
//    register_shrinker(&dev_priv->mm.inactive_shrinker);
}
>
>
//>
//>
#define>
#define>
#define>
#define>

Rev 3290	Rev 3298
1	/*	1	/*
2	* Copyright © 2008 Intel Corporation	2	* Copyright © 2008 Intel Corporation
3	*	3	*
4	* Permission is hereby granted, free of charge, to any person obtaining a	4	* Permission is hereby granted, free of charge, to any person obtaining a
5	* copy of this software and associated documentation files (the "Software"),	5	* copy of this software and associated documentation files (the "Software"),
6	* to deal in the Software without restriction, including without limitation	6	* to deal in the Software without restriction, including without limitation
7	* the rights to use, copy, modify, merge, publish, distribute, sublicense,	7	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
8	* and/or sell copies of the Software, and to permit persons to whom the	8	* and/or sell copies of the Software, and to permit persons to whom the
9	* Software is furnished to do so, subject to the following conditions:	9	* Software is furnished to do so, subject to the following conditions:
10	*	10	*
11	* The above copyright notice and this permission notice (including the next	11	* The above copyright notice and this permission notice (including the next
12	* paragraph) shall be included in all copies or substantial portions of the	12	* paragraph) shall be included in all copies or substantial portions of the
13	* Software.	13	* Software.
14	*	14	*
15	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR	15	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,	16	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL	17	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER	18	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING	19	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS	20	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21	* IN THE SOFTWARE.	21	* IN THE SOFTWARE.
22	*	22	*
23	* Authors:	23	* Authors:
24	* Eric Anholt	24	* Eric Anholt
25	*	25	*
26	*/	26	*/
27		27
28	#include	28	#include
29	#include	29	#include
30	#include "i915_drv.h"	30	#include "i915_drv.h"
31	#include "i915_trace.h"	31	#include "i915_trace.h"
32	#include "intel_drv.h"	32	#include "intel_drv.h"
33	#include	33	#include
34	#include	34	#include
35	//#include	35	//#include
36	#include	36	#include
37		37
38	extern int x86_clflush_size;	38	extern int x86_clflush_size;
39		39
40	#define PROT_READ 0x1 /* page can be read */	40	#define PROT_READ 0x1 /* page can be read */
41	#define PROT_WRITE 0x2 /* page can be written */	41	#define PROT_WRITE 0x2 /* page can be written */
42	#define MAP_SHARED 0x01 /* Share changes */	42	#define MAP_SHARED 0x01 /* Share changes */
43		43
44	#undef mb	44	#undef mb
45	#undef rmb	45	#undef rmb
46	#undef wmb	46	#undef wmb
47	#define mb() asm volatile("mfence")	47	#define mb() asm volatile("mfence")
48	#define rmb() asm volatile ("lfence")	48	#define rmb() asm volatile ("lfence")
49	#define wmb() asm volatile ("sfence")	49	#define wmb() asm volatile ("sfence")
50		50
51	struct drm_i915_gem_object *get_fb_obj();	51	struct drm_i915_gem_object *get_fb_obj();
52		52
53	unsigned long vm_mmap(struct file *file, unsigned long addr,	53	unsigned long vm_mmap(struct file *file, unsigned long addr,
54	unsigned long len, unsigned long prot,	54	unsigned long len, unsigned long prot,
55	unsigned long flag, unsigned long offset);	55	unsigned long flag, unsigned long offset);
56		56
57	static inline void clflush(volatile void *__p)	57	static inline void clflush(volatile void *__p)
58	{	58	{
59	asm volatile("clflush %0" : "+m" ((volatile char)__p));	59	asm volatile("clflush %0" : "+m" ((volatile char)__p));
60	}	60	}
61		61
62	#define MAX_ERRNO 4095	62	#define MAX_ERRNO 4095
63		63
64	#define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)	64	#define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
65		65
66		66
67	#define I915_EXEC_CONSTANTS_MASK (3<<6)	67	#define I915_EXEC_CONSTANTS_MASK (3<<6)
68	#define I915_EXEC_CONSTANTS_REL_GENERAL (0<<6) /* default */	68	#define I915_EXEC_CONSTANTS_REL_GENERAL (0<<6) /* default */
69	#define I915_EXEC_CONSTANTS_ABSOLUTE (1<<6)	69	#define I915_EXEC_CONSTANTS_ABSOLUTE (1<<6)
70	#define I915_EXEC_CONSTANTS_REL_SURFACE (2<<6) /* gen4/5 only */	70	#define I915_EXEC_CONSTANTS_REL_SURFACE (2<<6) /* gen4/5 only */
71		71
72	static void i915_gem_object_flush_gtt_write_domain(struct drm_i915_gem_object *obj);	72	static void i915_gem_object_flush_gtt_write_domain(struct drm_i915_gem_object *obj);
73	static void i915_gem_object_flush_cpu_write_domain(struct drm_i915_gem_object *obj);	73	static void i915_gem_object_flush_cpu_write_domain(struct drm_i915_gem_object *obj);
74	static __must_check int i915_gem_object_bind_to_gtt(struct drm_i915_gem_object *obj,	74	static __must_check int i915_gem_object_bind_to_gtt(struct drm_i915_gem_object *obj,
75	unsigned alignment,	75	unsigned alignment,
76	bool map_and_fenceable,	76	bool map_and_fenceable,
77	bool nonblocking);	77	bool nonblocking);
78	static int i915_gem_phys_pwrite(struct drm_device *dev,	78	static int i915_gem_phys_pwrite(struct drm_device *dev,
79	struct drm_i915_gem_object *obj,	79	struct drm_i915_gem_object *obj,
80	struct drm_i915_gem_pwrite *args,	80	struct drm_i915_gem_pwrite *args,
81	struct drm_file *file);	81	struct drm_file *file);
82		82
83	static void i915_gem_write_fence(struct drm_device *dev, int reg,	83	static void i915_gem_write_fence(struct drm_device *dev, int reg,
84	struct drm_i915_gem_object *obj);	84	struct drm_i915_gem_object *obj);
85	static void i915_gem_object_update_fence(struct drm_i915_gem_object *obj,	85	static void i915_gem_object_update_fence(struct drm_i915_gem_object *obj,
86	struct drm_i915_fence_reg *fence,	86	struct drm_i915_fence_reg *fence,
87	bool enable);	87	bool enable);
88		88
89	static long i915_gem_purge(struct drm_i915_private *dev_priv, long target);	89	static long i915_gem_purge(struct drm_i915_private *dev_priv, long target);
90	static void i915_gem_shrink_all(struct drm_i915_private *dev_priv);	90	static void i915_gem_shrink_all(struct drm_i915_private *dev_priv);
91	static void i915_gem_object_truncate(struct drm_i915_gem_object *obj);	91	static void i915_gem_object_truncate(struct drm_i915_gem_object *obj);
92		92
93	static inline void i915_gem_object_fence_lost(struct drm_i915_gem_object *obj)	93	static inline void i915_gem_object_fence_lost(struct drm_i915_gem_object *obj)
94	{	94	{
95	if (obj->tiling_mode)	95	if (obj->tiling_mode)
96	i915_gem_release_mmap(obj);	96	i915_gem_release_mmap(obj);
97		97
98	/* As we do not have an associated fence register, we will force	98	/* As we do not have an associated fence register, we will force
99	* a tiling change if we ever need to acquire one.	99	* a tiling change if we ever need to acquire one.
100	*/	100	*/
101	obj->fence_dirty = false;	101	obj->fence_dirty = false;
102	obj->fence_reg = I915_FENCE_REG_NONE;	102	obj->fence_reg = I915_FENCE_REG_NONE;
103	}	103	}
104		104
105	/* some bookkeeping */	105	/* some bookkeeping */
106	static void i915_gem_info_add_obj(struct drm_i915_private *dev_priv,	106	static void i915_gem_info_add_obj(struct drm_i915_private *dev_priv,
107	size_t size)	107	size_t size)
108	{	108	{
109	dev_priv->mm.object_count++;	109	dev_priv->mm.object_count++;
110	dev_priv->mm.object_memory += size;	110	dev_priv->mm.object_memory += size;
111	}	111	}
112		112
113	static void i915_gem_info_remove_obj(struct drm_i915_private *dev_priv,	113	static void i915_gem_info_remove_obj(struct drm_i915_private *dev_priv,
114	size_t size)	114	size_t size)
115	{	115	{
116	dev_priv->mm.object_count--;	116	dev_priv->mm.object_count--;
117	dev_priv->mm.object_memory -= size;	117	dev_priv->mm.object_memory -= size;
118	}	118	}
119		119
120	static int	120	static int
121	i915_gem_wait_for_error(struct drm_device *dev)	121	i915_gem_wait_for_error(struct drm_device *dev)
122	{	122	{
123	struct drm_i915_private *dev_priv = dev->dev_private;	123	struct drm_i915_private *dev_priv = dev->dev_private;
124	struct completion *x = &dev_priv->error_completion;	124	struct completion *x = &dev_priv->error_completion;
125	unsigned long flags;	125	unsigned long flags;
126	int ret;	126	int ret;
127		127
128	if (!atomic_read(&dev_priv->mm.wedged))	128	if (!atomic_read(&dev_priv->mm.wedged))
129	return 0;	129	return 0;
130	#if 0	130	#if 0
131	/*	131	/*
132	* Only wait 10 seconds for the gpu reset to complete to avoid hanging	132	* Only wait 10 seconds for the gpu reset to complete to avoid hanging
133	* userspace. If it takes that long something really bad is going on and	133	* userspace. If it takes that long something really bad is going on and
134	* we should simply try to bail out and fail as gracefully as possible.	134	* we should simply try to bail out and fail as gracefully as possible.
135	*/	135	*/
136	ret = wait_for_completion_interruptible_timeout(x, 10*HZ);	136	ret = wait_for_completion_interruptible_timeout(x, 10*HZ);
137	if (ret == 0) {	137	if (ret == 0) {
138	DRM_ERROR("Timed out waiting for the gpu reset to complete\n");	138	DRM_ERROR("Timed out waiting for the gpu reset to complete\n");
139	return -EIO;	139	return -EIO;
140	} else if (ret < 0) {	140	} else if (ret < 0) {
141	return ret;	141	return ret;
142	}	142	}
143		143
144	if (atomic_read(&dev_priv->mm.wedged)) {	144	if (atomic_read(&dev_priv->mm.wedged)) {
145	/* GPU is hung, bump the completion count to account for	145	/* GPU is hung, bump the completion count to account for
146	* the token we just consumed so that we never hit zero and	146	* the token we just consumed so that we never hit zero and
147	* end up waiting upon a subsequent completion event that	147	* end up waiting upon a subsequent completion event that
148	* will never happen.	148	* will never happen.
149	*/	149	*/
150	spin_lock_irqsave(&x->wait.lock, flags);	150	spin_lock_irqsave(&x->wait.lock, flags);
151	x->done++;	151	x->done++;
152	spin_unlock_irqrestore(&x->wait.lock, flags);	152	spin_unlock_irqrestore(&x->wait.lock, flags);
153	}	153	}
154	#endif	154	#endif
155		155
156	return 0;	156	return 0;
157	}	157	}
158		158
159	int i915_mutex_lock_interruptible(struct drm_device *dev)	159	int i915_mutex_lock_interruptible(struct drm_device *dev)
160	{	160	{
161	int ret;	161	int ret;
162		162
163	ret = i915_gem_wait_for_error(dev);	163	ret = i915_gem_wait_for_error(dev);
164	if (ret)	164	if (ret)
165	return ret;	165	return ret;
166		166
167	mutex_lock(&dev->struct_mutex);	167	mutex_lock(&dev->struct_mutex);
168		168
169	WARN_ON(i915_verify_lists(dev));	169	WARN_ON(i915_verify_lists(dev));
170	return 0;	170	return 0;
171	}	171	}
172		172
173	static inline bool	173	static inline bool
174	i915_gem_object_is_inactive(struct drm_i915_gem_object *obj)	174	i915_gem_object_is_inactive(struct drm_i915_gem_object *obj)
175	{	175	{
176	return obj->gtt_space && !obj->active;	176	return obj->gtt_space && !obj->active;
177	}	177	}
178		178
179		179
180	#if 0	180	#if 0
181		181
182	int	182	int
183	i915_gem_init_ioctl(struct drm_device dev, void data,	183	i915_gem_init_ioctl(struct drm_device dev, void data,
184	struct drm_file *file)	184	struct drm_file *file)
185	{	185	{
186	struct drm_i915_gem_init *args = data;	186	struct drm_i915_gem_init *args = data;
187		187
188	if (drm_core_check_feature(dev, DRIVER_MODESET))	188	if (drm_core_check_feature(dev, DRIVER_MODESET))
189	return -ENODEV;	189	return -ENODEV;
190		190
191	if (args->gtt_start >= args->gtt_end \|\|	191	if (args->gtt_start >= args->gtt_end \|\|
192	(args->gtt_end \| args->gtt_start) & (PAGE_SIZE - 1))	192	(args->gtt_end \| args->gtt_start) & (PAGE_SIZE - 1))
193	return -EINVAL;	193	return -EINVAL;
194		194
195	/* GEM with user mode setting was never supported on ilk and later. */	195	/* GEM with user mode setting was never supported on ilk and later. */
196	if (INTEL_INFO(dev)->gen >= 5)	196	if (INTEL_INFO(dev)->gen >= 5)
197	return -ENODEV;	197	return -ENODEV;
198		198
199	mutex_lock(&dev->struct_mutex);	199	mutex_lock(&dev->struct_mutex);
200	i915_gem_init_global_gtt(dev, args->gtt_start,	200	i915_gem_init_global_gtt(dev, args->gtt_start,
201	args->gtt_end, args->gtt_end);	201	args->gtt_end, args->gtt_end);
202	mutex_unlock(&dev->struct_mutex);	202	mutex_unlock(&dev->struct_mutex);
203		203
204	return 0;	204	return 0;
205	}	205	}
206	#endif	206	#endif
207		207
208	int	208	int
209	i915_gem_get_aperture_ioctl(struct drm_device dev, void data,	209	i915_gem_get_aperture_ioctl(struct drm_device dev, void data,
210	struct drm_file *file)	210	struct drm_file *file)
211	{	211	{
212	struct drm_i915_private *dev_priv = dev->dev_private;	212	struct drm_i915_private *dev_priv = dev->dev_private;
213	struct drm_i915_gem_get_aperture *args = data;	213	struct drm_i915_gem_get_aperture *args = data;
214	struct drm_i915_gem_object *obj;	214	struct drm_i915_gem_object *obj;
215	size_t pinned;	215	size_t pinned;
216		216
217	pinned = 0;	217	pinned = 0;
218	mutex_lock(&dev->struct_mutex);	218	mutex_lock(&dev->struct_mutex);
219	list_for_each_entry(obj, &dev_priv->mm.bound_list, gtt_list)	219	list_for_each_entry(obj, &dev_priv->mm.bound_list, gtt_list)
220	if (obj->pin_count)	220	if (obj->pin_count)
221	pinned += obj->gtt_space->size;	221	pinned += obj->gtt_space->size;
222	mutex_unlock(&dev->struct_mutex);	222	mutex_unlock(&dev->struct_mutex);
223		223
224	args->aper_size = dev_priv->mm.gtt_total;	224	args->aper_size = dev_priv->mm.gtt_total;
225	args->aper_available_size = args->aper_size - pinned;	225	args->aper_available_size = args->aper_size - pinned;
226		226
227	return 0;	227	return 0;
228	}	228	}
229		229
230	static int	230	static int
231	i915_gem_create(struct drm_file *file,	231	i915_gem_create(struct drm_file *file,
232	struct drm_device *dev,	232	struct drm_device *dev,
233	uint64_t size,	233	uint64_t size,
234	uint32_t *handle_p)	234	uint32_t *handle_p)
235	{	235	{
236	struct drm_i915_gem_object *obj;	236	struct drm_i915_gem_object *obj;
237	int ret;	237	int ret;
238	u32 handle;	238	u32 handle;
239		-
240	ENTER();	-
241		239
242	size = roundup(size, PAGE_SIZE);	240	size = roundup(size, PAGE_SIZE);
243	if (size == 0)	241	if (size == 0)
244	return -EINVAL;	242	return -EINVAL;
245		243
246	/* Allocate the new object */	244	/* Allocate the new object */
247	obj = i915_gem_alloc_object(dev, size);	245	obj = i915_gem_alloc_object(dev, size);
248	if (obj == NULL)	246	if (obj == NULL)
249	return -ENOMEM;	247	return -ENOMEM;
250		248
251	ret = drm_gem_handle_create(file, &obj->base, &handle);	249	ret = drm_gem_handle_create(file, &obj->base, &handle);
252	if (ret) {	250	if (ret) {
253	drm_gem_object_release(&obj->base);	251	drm_gem_object_release(&obj->base);
254	i915_gem_info_remove_obj(dev->dev_private, obj->base.size);	252	i915_gem_info_remove_obj(dev->dev_private, obj->base.size);
255	kfree(obj);	253	kfree(obj);
256	return ret;	254	return ret;
257	}	255	}
258		256
259	/* drop reference from allocate - handle holds it now */	257	/* drop reference from allocate - handle holds it now */
260	drm_gem_object_unreference(&obj->base);	258	drm_gem_object_unreference(&obj->base);
261	trace_i915_gem_object_create(obj);	259	trace_i915_gem_object_create(obj);
262		260
263	*handle_p = handle;	261	*handle_p = handle;
264		262
265	printf("%s obj %p handle %d\n", __FUNCTION__, obj, handle);	263	// printf("%s obj %p handle %d\n", __FUNCTION__, obj, handle);
266		264
267	return 0;	265	return 0;
268	}	266	}
269		267
270	int	268	int
271	i915_gem_dumb_create(struct drm_file *file,	269	i915_gem_dumb_create(struct drm_file *file,
272	struct drm_device *dev,	270	struct drm_device *dev,
273	struct drm_mode_create_dumb *args)	271	struct drm_mode_create_dumb *args)
274	{	272	{
275	/* have to work out size/pitch and return them */	273	/* have to work out size/pitch and return them */
276	args->pitch = ALIGN(args->width * ((args->bpp + 7) / 8), 64);	274	args->pitch = ALIGN(args->width * ((args->bpp + 7) / 8), 64);
277	args->size = args->pitch * args->height;	275	args->size = args->pitch * args->height;
278	return i915_gem_create(file, dev,	276	return i915_gem_create(file, dev,
279	args->size, &args->handle);	277	args->size, &args->handle);
280	}	278	}
281		279
282	int i915_gem_dumb_destroy(struct drm_file *file,	280	int i915_gem_dumb_destroy(struct drm_file *file,
283	struct drm_device *dev,	281	struct drm_device *dev,
284	uint32_t handle)	282	uint32_t handle)
285	{	283	{
286	return drm_gem_handle_delete(file, handle);	284	return drm_gem_handle_delete(file, handle);
287	}	285	}
288		286
289	/**	287	/**
290	* Creates a new mm object and returns a handle to it.	288	* Creates a new mm object and returns a handle to it.
291	*/	289	*/
292	int	290	int
293	i915_gem_create_ioctl(struct drm_device dev, void data,	291	i915_gem_create_ioctl(struct drm_device dev, void data,
294	struct drm_file *file)	292	struct drm_file *file)
295	{	293	{
296	struct drm_i915_gem_create *args = data;	294	struct drm_i915_gem_create *args = data;
297		295
298	return i915_gem_create(file, dev,	296	return i915_gem_create(file, dev,
299	args->size, &args->handle);	297	args->size, &args->handle);
300	}	298	}
301		299
302	static int i915_gem_object_needs_bit17_swizzle(struct drm_i915_gem_object *obj)	300	static int i915_gem_object_needs_bit17_swizzle(struct drm_i915_gem_object *obj)
303	{	301	{
304	drm_i915_private_t *dev_priv = obj->base.dev->dev_private;	302	drm_i915_private_t *dev_priv = obj->base.dev->dev_private;
305		303
306	return dev_priv->mm.bit_6_swizzle_x == I915_BIT_6_SWIZZLE_9_10_17 &&	304	return dev_priv->mm.bit_6_swizzle_x == I915_BIT_6_SWIZZLE_9_10_17 &&
307	obj->tiling_mode != I915_TILING_NONE;	305	obj->tiling_mode != I915_TILING_NONE;
308	}	306	}
309	#if 0	307	#if 0
310		308
311	static inline int	309	static inline int
312	__copy_to_user_swizzled(char __user *cpu_vaddr,	310	__copy_to_user_swizzled(char __user *cpu_vaddr,
313	const char *gpu_vaddr, int gpu_offset,	311	const char *gpu_vaddr, int gpu_offset,
314	int length)	312	int length)
315	{	313	{
316	int ret, cpu_offset = 0;	314	int ret, cpu_offset = 0;
317		315
318	while (length > 0) {	316	while (length > 0) {
319	int cacheline_end = ALIGN(gpu_offset + 1, 64);	317	int cacheline_end = ALIGN(gpu_offset + 1, 64);
320	int this_length = min(cacheline_end - gpu_offset, length);	318	int this_length = min(cacheline_end - gpu_offset, length);
321	int swizzled_gpu_offset = gpu_offset ^ 64;	319	int swizzled_gpu_offset = gpu_offset ^ 64;
322		320
323	ret = __copy_to_user(cpu_vaddr + cpu_offset,	321	ret = __copy_to_user(cpu_vaddr + cpu_offset,
324	gpu_vaddr + swizzled_gpu_offset,	322	gpu_vaddr + swizzled_gpu_offset,
325	this_length);	323	this_length);
326	if (ret)	324	if (ret)
327	return ret + length;	325	return ret + length;
328		326
329	cpu_offset += this_length;	327	cpu_offset += this_length;
330	gpu_offset += this_length;	328	gpu_offset += this_length;
331	length -= this_length;	329	length -= this_length;
332	}	330	}
333		331
334	return 0;	332	return 0;
335	}	333	}
336		334
337	static inline int	335	static inline int
338	__copy_from_user_swizzled(char *gpu_vaddr, int gpu_offset,	336	__copy_from_user_swizzled(char *gpu_vaddr, int gpu_offset,
339	const char __user *cpu_vaddr,	337	const char __user *cpu_vaddr,
340	int length)	338	int length)
341	{	339	{
342	int ret, cpu_offset = 0;	340	int ret, cpu_offset = 0;
343		341
344	while (length > 0) {	342	while (length > 0) {
345	int cacheline_end = ALIGN(gpu_offset + 1, 64);	343	int cacheline_end = ALIGN(gpu_offset + 1, 64);
346	int this_length = min(cacheline_end - gpu_offset, length);	344	int this_length = min(cacheline_end - gpu_offset, length);
347	int swizzled_gpu_offset = gpu_offset ^ 64;	345	int swizzled_gpu_offset = gpu_offset ^ 64;
348		346
349	ret = __copy_from_user(gpu_vaddr + swizzled_gpu_offset,	347	ret = __copy_from_user(gpu_vaddr + swizzled_gpu_offset,
350	cpu_vaddr + cpu_offset,	348	cpu_vaddr + cpu_offset,
351	this_length);	349	this_length);
352	if (ret)	350	if (ret)
353	return ret + length;	351	return ret + length;
354		352
355	cpu_offset += this_length;	353	cpu_offset += this_length;
356	gpu_offset += this_length;	354	gpu_offset += this_length;
357	length -= this_length;	355	length -= this_length;
358	}	356	}
359		357
360	return 0;	358	return 0;
361	}	359	}
362		360
363	/* Per-page copy function for the shmem pread fastpath.	361	/* Per-page copy function for the shmem pread fastpath.
364	* Flushes invalid cachelines before reading the target if	362	* Flushes invalid cachelines before reading the target if
365	* needs_clflush is set. */	363	* needs_clflush is set. */
366	static int	364	static int
367	shmem_pread_fast(struct page *page, int shmem_page_offset, int page_length,	365	shmem_pread_fast(struct page *page, int shmem_page_offset, int page_length,
368	char __user *user_data,	366	char __user *user_data,
369	bool page_do_bit17_swizzling, bool needs_clflush)	367	bool page_do_bit17_swizzling, bool needs_clflush)
370	{	368	{
371	char *vaddr;	369	char *vaddr;
372	int ret;	370	int ret;
373		371
374	if (unlikely(page_do_bit17_swizzling))	372	if (unlikely(page_do_bit17_swizzling))
375	return -EINVAL;	373	return -EINVAL;
376		374
377	vaddr = kmap_atomic(page);	375	vaddr = kmap_atomic(page);
378	if (needs_clflush)	376	if (needs_clflush)
379	drm_clflush_virt_range(vaddr + shmem_page_offset,	377	drm_clflush_virt_range(vaddr + shmem_page_offset,
380	page_length);	378	page_length);
381	ret = __copy_to_user_inatomic(user_data,	379	ret = __copy_to_user_inatomic(user_data,
382	vaddr + shmem_page_offset,	380	vaddr + shmem_page_offset,
383	page_length);	381	page_length);
384	kunmap_atomic(vaddr);	382	kunmap_atomic(vaddr);
385		383
386	return ret ? -EFAULT : 0;	384	return ret ? -EFAULT : 0;
387	}	385	}
388		386
389	static void	387	static void
390	shmem_clflush_swizzled_range(char *addr, unsigned long length,	388	shmem_clflush_swizzled_range(char *addr, unsigned long length,
391	bool swizzled)	389	bool swizzled)
392	{	390	{
393	if (unlikely(swizzled)) {	391	if (unlikely(swizzled)) {
394	unsigned long start = (unsigned long) addr;	392	unsigned long start = (unsigned long) addr;
395	unsigned long end = (unsigned long) addr + length;	393	unsigned long end = (unsigned long) addr + length;
396		394
397	/* For swizzling simply ensure that we always flush both	395	/* For swizzling simply ensure that we always flush both
398	* channels. Lame, but simple and it works. Swizzled	396	* channels. Lame, but simple and it works. Swizzled
399	* pwrite/pread is far from a hotpath - current userspace	397	* pwrite/pread is far from a hotpath - current userspace
400	* doesn't use it at all. */	398	* doesn't use it at all. */
401	start = round_down(start, 128);	399	start = round_down(start, 128);
402	end = round_up(end, 128);	400	end = round_up(end, 128);
403		401
404	drm_clflush_virt_range((void *)start, end - start);	402	drm_clflush_virt_range((void *)start, end - start);
405	} else {	403	} else {
406	drm_clflush_virt_range(addr, length);	404	drm_clflush_virt_range(addr, length);
407	}	405	}
408		406
409	}	407	}
410		408
411	/* Only difference to the fast-path function is that this can handle bit17	409	/* Only difference to the fast-path function is that this can handle bit17
412	* and uses non-atomic copy and kmap functions. */	410	* and uses non-atomic copy and kmap functions. */
413	static int	411	static int
414	shmem_pread_slow(struct page *page, int shmem_page_offset, int page_length,	412	shmem_pread_slow(struct page *page, int shmem_page_offset, int page_length,
415	char __user *user_data,	413	char __user *user_data,
416	bool page_do_bit17_swizzling, bool needs_clflush)	414	bool page_do_bit17_swizzling, bool needs_clflush)
417	{	415	{
418	char *vaddr;	416	char *vaddr;
419	int ret;	417	int ret;
420		418
421	vaddr = kmap(page);	419	vaddr = kmap(page);
422	if (needs_clflush)	420	if (needs_clflush)
423	shmem_clflush_swizzled_range(vaddr + shmem_page_offset,	421	shmem_clflush_swizzled_range(vaddr + shmem_page_offset,
424	page_length,	422	page_length,
425	page_do_bit17_swizzling);	423	page_do_bit17_swizzling);
426		424
427	if (page_do_bit17_swizzling)	425	if (page_do_bit17_swizzling)
428	ret = __copy_to_user_swizzled(user_data,	426	ret = __copy_to_user_swizzled(user_data,
429	vaddr, shmem_page_offset,	427	vaddr, shmem_page_offset,
430	page_length);	428	page_length);
431	else	429	else
432	ret = __copy_to_user(user_data,	430	ret = __copy_to_user(user_data,
433	vaddr + shmem_page_offset,	431	vaddr + shmem_page_offset,
434	page_length);	432	page_length);
435	kunmap(page);	433	kunmap(page);
436		434
437	return ret ? - EFAULT : 0;	435	return ret ? - EFAULT : 0;
438	}	436	}
439		437
440	static int	438	static int
441	i915_gem_shmem_pread(struct drm_device *dev,	439	i915_gem_shmem_pread(struct drm_device *dev,
442	struct drm_i915_gem_object *obj,	440	struct drm_i915_gem_object *obj,
443	struct drm_i915_gem_pread *args,	441	struct drm_i915_gem_pread *args,
444	struct drm_file *file)	442	struct drm_file *file)
445	{	443	{
446	char __user *user_data;	444	char __user *user_data;
447	ssize_t remain;	445	ssize_t remain;
448	loff_t offset;	446	loff_t offset;
449	int shmem_page_offset, page_length, ret = 0;	447	int shmem_page_offset, page_length, ret = 0;
450	int obj_do_bit17_swizzling, page_do_bit17_swizzling;	448	int obj_do_bit17_swizzling, page_do_bit17_swizzling;
451	int hit_slowpath = 0;	449	int hit_slowpath = 0;
452	int prefaulted = 0;	450	int prefaulted = 0;
453	int needs_clflush = 0;	451	int needs_clflush = 0;
454	struct scatterlist *sg;	452	struct scatterlist *sg;
455	int i;	453	int i;
456		454
457	user_data = (char __user *) (uintptr_t) args->data_ptr;	455	user_data = (char __user *) (uintptr_t) args->data_ptr;
458	remain = args->size;	456	remain = args->size;
459		457
460	obj_do_bit17_swizzling = i915_gem_object_needs_bit17_swizzle(obj);	458	obj_do_bit17_swizzling = i915_gem_object_needs_bit17_swizzle(obj);
461		459
462	if (!(obj->base.read_domains & I915_GEM_DOMAIN_CPU)) {	460	if (!(obj->base.read_domains & I915_GEM_DOMAIN_CPU)) {
463	/* If we're not in the cpu read domain, set ourself into the gtt	461	/* If we're not in the cpu read domain, set ourself into the gtt
464	* read domain and manually flush cachelines (if required). This	462	* read domain and manually flush cachelines (if required). This
465	* optimizes for the case when the gpu will dirty the data	463	* optimizes for the case when the gpu will dirty the data
466	* anyway again before the next pread happens. */	464	* anyway again before the next pread happens. */
467	if (obj->cache_level == I915_CACHE_NONE)	465	if (obj->cache_level == I915_CACHE_NONE)
468	needs_clflush = 1;	466	needs_clflush = 1;
469	if (obj->gtt_space) {	467	if (obj->gtt_space) {
470	ret = i915_gem_object_set_to_gtt_domain(obj, false);	468	ret = i915_gem_object_set_to_gtt_domain(obj, false);
471	if (ret)	469	if (ret)
472	return ret;	470	return ret;
473	}	471	}
474	}	472	}
475		473
476	ret = i915_gem_object_get_pages(obj);	474	ret = i915_gem_object_get_pages(obj);
477	if (ret)	475	if (ret)
478	return ret;	476	return ret;
479		477
480	i915_gem_object_pin_pages(obj);	478	i915_gem_object_pin_pages(obj);
481		479
482	offset = args->offset;	480	offset = args->offset;
483		481
484	for_each_sg(obj->pages->sgl, sg, obj->pages->nents, i) {	482	for_each_sg(obj->pages->sgl, sg, obj->pages->nents, i) {
485	struct page *page;	483	struct page *page;
486		484
487	if (i < offset >> PAGE_SHIFT)	485	if (i < offset >> PAGE_SHIFT)
488	continue;	486	continue;
489		487
490	if (remain <= 0)	488	if (remain <= 0)
491	break;	489	break;
492		490
493	/* Operation in this page	491	/* Operation in this page
494	*	492	*
495	* shmem_page_offset = offset within page in shmem file	493	* shmem_page_offset = offset within page in shmem file
496	* page_length = bytes to copy for this page	494	* page_length = bytes to copy for this page
497	*/	495	*/
498	shmem_page_offset = offset_in_page(offset);	496	shmem_page_offset = offset_in_page(offset);
499	page_length = remain;	497	page_length = remain;
500	if ((shmem_page_offset + page_length) > PAGE_SIZE)	498	if ((shmem_page_offset + page_length) > PAGE_SIZE)

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(root)/drivers/video/drm/i915/i915_gem.c – Rev 3290 → 3298