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/*

 * Copyright © 2008-2012 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 

 *    Chris Wilson 

 *

 */

#include 

#include 

#include "i915_drv.h"

/*

 * The BIOS typically reserves some of the system's memory for the exclusive

 * use of the integrated graphics. This memory is no longer available for

 * use by the OS and so the user finds that his system has less memory

 * available than he put in. We refer to this memory as stolen.

 *

 * The BIOS will allocate its framebuffer from the stolen memory. Our

 * goal is try to reuse that object for our own fbcon which must always

 * be available for panics. Anything else we can reuse the stolen memory

 * for is a boon.

 */

static unsigned long i915_stolen_to_physical(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct pci_dev *pdev = dev_priv->bridge_dev;

	u32 base;

	/* On the machines I have tested the Graphics Base of Stolen Memory

	 * is unreliable, so on those compute the base by subtracting the

	 * stolen memory from the Top of Low Usable DRAM which is where the

	 * BIOS places the graphics stolen memory.

	 *

	 * On gen2, the layout is slightly different with the Graphics Segment

	 * immediately following Top of Memory (or Top of Usable DRAM). Note

	 * it appears that TOUD is only reported by 865g, so we just use the

	 * top of memory as determined by the e820 probe.

	 *

	 * XXX gen2 requires an unavailable symbol and 945gm fails with

	 * its value of TOLUD.

	 */

	base = 0;

	if (INTEL_INFO(dev)->gen >= 6) {

		/* Read Base Data of Stolen Memory Register (BDSM) directly.

		 * Note that there is also a MCHBAR miror at 0x1080c0 or

		 * we could use device 2:0x5c instead.

	 */

		pci_read_config_dword(pdev, 0xB0, &base);

		base &= ~4095; /* lower bits used for locking register */

	} else if (INTEL_INFO(dev)->gen > 3 || IS_G33(dev)) {

		/* Read Graphics Base of Stolen Memory directly */

		pci_read_config_dword(pdev, 0xA4, &base);

#if 0

	} else if (IS_GEN3(dev)) {

		u8 val;

		/* Stolen is immediately below Top of Low Usable DRAM */

		pci_read_config_byte(pdev, 0x9c, &val);

		base = val >> 3 << 27;

	base -= dev_priv->mm.gtt->stolen_size;

	} else {

		/* Stolen is immediately above Top of Memory */

		base = max_low_pfn_mapped << PAGE_SHIFT;

#endif

	}

	return base;

}

static int i915_setup_compression(struct drm_device *dev, int size)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct drm_mm_node *compressed_fb, *uninitialized_var(compressed_llb);

	/* Try to over-allocate to reduce reallocations and fragmentation */

	compressed_fb = drm_mm_search_free(&dev_priv->mm.stolen,

					   size <<= 1, 4096, 0);

	if (!compressed_fb)

		compressed_fb = drm_mm_search_free(&dev_priv->mm.stolen,

						   size >>= 1, 4096, 0);

	if (compressed_fb)

		compressed_fb = drm_mm_get_block(compressed_fb, size, 4096);

	if (!compressed_fb)

		goto err;

	if (HAS_PCH_SPLIT(dev))

		I915_WRITE(ILK_DPFC_CB_BASE, compressed_fb->start);

	else if (IS_GM45(dev)) {

		I915_WRITE(DPFC_CB_BASE, compressed_fb->start);

	} else {

		compressed_llb = drm_mm_search_free(&dev_priv->mm.stolen,

						    4096, 4096, 0);

		if (compressed_llb)

			compressed_llb = drm_mm_get_block(compressed_llb,

							  4096, 4096);

		if (!compressed_llb)

			goto err_fb;

		dev_priv->compressed_llb = compressed_llb;

		I915_WRITE(FBC_CFB_BASE,

			   dev_priv->mm.stolen_base + compressed_fb->start);

		I915_WRITE(FBC_LL_BASE,

			   dev_priv->mm.stolen_base + compressed_llb->start);

	}

	dev_priv->compressed_fb = compressed_fb;

	dev_priv->cfb_size = size;

	DRM_DEBUG_KMS("reserved %d bytes of contiguous stolen space for FBC\n",

		      size);

	return 0;

err_fb:

	drm_mm_put_block(compressed_fb);

err:

	return -ENOSPC;

}

int i915_gem_stolen_setup_compression(struct drm_device *dev, int size)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	if (dev_priv->mm.stolen_base == 0)

		return -ENODEV;

	if (size < dev_priv->cfb_size)

		return 0;

	/* Release any current block */

	i915_gem_stolen_cleanup_compression(dev);

	return i915_setup_compression(dev, size);

}

void i915_gem_stolen_cleanup_compression(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	if (dev_priv->cfb_size == 0)

		return;

	if (dev_priv->compressed_fb)

	drm_mm_put_block(dev_priv->compressed_fb);

	if (dev_priv->compressed_llb)

		drm_mm_put_block(dev_priv->compressed_llb);

	dev_priv->cfb_size = 0;

}

void i915_gem_cleanup_stolen(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	i915_gem_stolen_cleanup_compression(dev);

	drm_mm_takedown(&dev_priv->mm.stolen);

}

int i915_gem_init_stolen(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	dev_priv->mm.stolen_base = i915_stolen_to_physical(dev);

	if (dev_priv->mm.stolen_base == 0)

		return 0;

	DRM_DEBUG_KMS("found %zd bytes of stolen memory at %08lx\n",

		      dev_priv->gtt.stolen_size, dev_priv->mm.stolen_base);

	/* Basic memrange allocator for stolen space */

	drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_size);

	return 0;

}

static struct sg_table *

i915_pages_create_for_stolen(struct drm_device *dev,

			     u32 offset, u32 size)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct sg_table *st;

	struct scatterlist *sg;

	DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size);

	BUG_ON(offset > dev_priv->gtt.stolen_size - size);

	/* We hide that we have no struct page backing our stolen object

	 * by wrapping the contiguous physical allocation with a fake

	 * dma mapping in a single scatterlist.

	 */

	st = kmalloc(sizeof(*st), GFP_KERNEL);

	if (st == NULL)

		return NULL;

	if (sg_alloc_table(st, 1, GFP_KERNEL)) {

		kfree(st);

		return NULL;

	}

	sg = st->sgl;

	sg->offset = offset;

	sg->length = size;

	sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset;

	sg_dma_len(sg) = size;

	return st;

}

static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)

{

	BUG();

	return -EINVAL;

}

static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj)

{

	/* Should only be called during free */

	sg_free_table(obj->pages);

	kfree(obj->pages);

}

static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {

	.get_pages = i915_gem_object_get_pages_stolen,

	.put_pages = i915_gem_object_put_pages_stolen,

};

static struct drm_i915_gem_object *

_i915_gem_object_create_stolen(struct drm_device *dev,

			       struct drm_mm_node *stolen)

{

	struct drm_i915_gem_object *obj;

	obj = i915_gem_object_alloc(dev);

	if (obj == NULL)

		return NULL;

	if (drm_gem_private_object_init(dev, &obj->base, stolen->size))

		goto cleanup;

	i915_gem_object_init(obj, &i915_gem_object_stolen_ops);

	obj->pages = i915_pages_create_for_stolen(dev,

						  stolen->start, stolen->size);

	if (obj->pages == NULL)

		goto cleanup;

	obj->has_dma_mapping = true;

	obj->pages_pin_count = 1;

	obj->stolen = stolen;

	obj->base.write_domain = I915_GEM_DOMAIN_GTT;

	obj->base.read_domains = I915_GEM_DOMAIN_GTT;

	obj->cache_level = I915_CACHE_NONE;

	return obj;

cleanup:

	i915_gem_object_free(obj);

	return NULL;

}

struct drm_i915_gem_object *

i915_gem_object_create_stolen(struct drm_device *dev, u32 size)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct drm_i915_gem_object *obj;

	struct drm_mm_node *stolen;

	if (dev_priv->mm.stolen_base == 0)

		return NULL;

	DRM_DEBUG_KMS("creating stolen object: size=%x\n", size);

	if (size == 0)

		return NULL;

	stolen = drm_mm_search_free(&dev_priv->mm.stolen, size, 4096, 0);

	if (stolen)

		stolen = drm_mm_get_block(stolen, size, 4096);

	if (stolen == NULL)

		return NULL;

	obj = _i915_gem_object_create_stolen(dev, stolen);

	if (obj)

		return obj;

	drm_mm_put_block(stolen);

	return NULL;

}

struct drm_i915_gem_object *

i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,

					       u32 stolen_offset,

					       u32 gtt_offset,

					       u32 size)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct drm_i915_gem_object *obj;

	struct drm_mm_node *stolen;

	if (dev_priv->mm.stolen_base == 0)

		return NULL;

	DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",

			stolen_offset, gtt_offset, size);

	/* KISS and expect everything to be page-aligned */

	BUG_ON(stolen_offset & 4095);

	BUG_ON(gtt_offset & 4095);

	BUG_ON(size & 4095);

	if (WARN_ON(size == 0))

		return NULL;

	stolen = drm_mm_create_block(&dev_priv->mm.stolen,

				     stolen_offset, size,

				     false);

	if (stolen == NULL) {

		DRM_DEBUG_KMS("failed to allocate stolen space\n");

		return NULL;

	}

	obj = _i915_gem_object_create_stolen(dev, stolen);

	if (obj == NULL) {

		DRM_DEBUG_KMS("failed to allocate stolen object\n");

		drm_mm_put_block(stolen);

		return NULL;

	}

	/* To simplify the initialisation sequence between KMS and GTT,

	 * we allow construction of the stolen object prior to

	 * setting up the GTT space. The actual reservation will occur

	 * later.

	 */

	if (drm_mm_initialized(&dev_priv->mm.gtt_space)) {

		obj->gtt_space = drm_mm_create_block(&dev_priv->mm.gtt_space,

						     gtt_offset, size,

						     false);

		if (obj->gtt_space == NULL) {

			DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");

			drm_gem_object_unreference(&obj->base);

			return NULL;

		}

	} else

		obj->gtt_space = I915_GTT_RESERVED;

	obj->gtt_offset = gtt_offset;

	obj->has_global_gtt_mapping = 1;

	list_add_tail(&obj->gtt_list, &dev_priv->mm.bound_list);

	list_add_tail(&obj->mm_list, &dev_priv->mm.inactive_list);

	return obj;

}

void

i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)

{

	if (obj->stolen) {

		drm_mm_put_block(obj->stolen);

		obj->stolen = NULL;

	}

}