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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"

#define KB(x) ((x) * 1024)

#define MB(x) (KB(x) * 1024)

/*

 * 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.

 */

int i915_gem_stolen_insert_node_in_range(struct drm_i915_private *dev_priv,

					 struct drm_mm_node *node, u64 size,

					 unsigned alignment, u64 start, u64 end)

{

	int ret;

	if (!drm_mm_initialized(&dev_priv->mm.stolen))

		return -ENODEV;

	/* See the comment at the drm_mm_init() call for more about this check.

	 * WaSkipStolenMemoryFirstPage:bdw,chv (incomplete) */

	if (INTEL_INFO(dev_priv)->gen == 8 && start < 4096)

		start = 4096;

	mutex_lock(&dev_priv->mm.stolen_lock);

	ret = drm_mm_insert_node_in_range(&dev_priv->mm.stolen, node, size,

					  alignment, start, end,

					  DRM_MM_SEARCH_DEFAULT);

	mutex_unlock(&dev_priv->mm.stolen_lock);

	return ret;

}

int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv,

				struct drm_mm_node *node, u64 size,

				unsigned alignment)

{

	return i915_gem_stolen_insert_node_in_range(dev_priv, node, size,

					alignment, 0,

					dev_priv->gtt.stolen_usable_size);

}

void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv,

				 struct drm_mm_node *node)

{

	mutex_lock(&dev_priv->mm.stolen_lock);

	drm_mm_remove_node(node);

	mutex_unlock(&dev_priv->mm.stolen_lock);

}

static unsigned long i915_stolen_to_physical(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct resource *r;

	u32 base;

	/* Almost universally we can find the Graphics Base of Stolen Memory

	 * at offset 0x5c in the igfx configuration space. On a few (desktop)

	 * machines this is also mirrored in the bridge device at different

	 * locations, or in the MCHBAR.

	 *

	 * On 865 we just check the TOUD register.

	 *

	 * On 830/845/85x the stolen memory base isn't available in any

	 * register. We need to calculate it as TOM-TSEG_SIZE-stolen_size.

	 *

	 */

	base = 0;

	if (INTEL_INFO(dev)->gen >= 3) {

		/* Read Graphics Base of Stolen Memory directly */

		pci_read_config_dword(dev->pdev, 0x5c, &base);

		base &= ~((1<<20) - 1);

	} else { /* GEN2 */

#if 0

		/* Stolen is immediately above Top of Memory */

		base = max_low_pfn_mapped << PAGE_SHIFT;

#endif

	}

	if (base == 0)

		return 0;

	/* make sure we don't clobber the GTT if it's within stolen memory */

	if (INTEL_INFO(dev)->gen <= 4 && !IS_G33(dev) && !IS_G4X(dev)) {

		struct {

			u32 start, end;

		} stolen[2] = {

			{ .start = base, .end = base + dev_priv->gtt.stolen_size, },

			{ .start = base, .end = base + dev_priv->gtt.stolen_size, },

		};

		u64 gtt_start, gtt_end;

		gtt_start = I915_READ(PGTBL_CTL);

		if (IS_GEN4(dev))

			gtt_start = (gtt_start & PGTBL_ADDRESS_LO_MASK) |

				(gtt_start & PGTBL_ADDRESS_HI_MASK) << 28;

		else

			gtt_start &= PGTBL_ADDRESS_LO_MASK;

		gtt_end = gtt_start + gtt_total_entries(dev_priv->gtt) * 4;

		if (gtt_start >= stolen[0].start && gtt_start < stolen[0].end)

			stolen[0].end = gtt_start;

		if (gtt_end > stolen[1].start && gtt_end <= stolen[1].end)

			stolen[1].start = gtt_end;

		/* pick the larger of the two chunks */

		if (stolen[0].end - stolen[0].start >

		    stolen[1].end - stolen[1].start) {

			base = stolen[0].start;

			dev_priv->gtt.stolen_size = stolen[0].end - stolen[0].start;

		} else {

			base = stolen[1].start;

			dev_priv->gtt.stolen_size = stolen[1].end - stolen[1].start;

		}

		if (stolen[0].start != stolen[1].start ||

		    stolen[0].end != stolen[1].end) {

			DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n",

				      (unsigned long long) gtt_start,

				      (unsigned long long) gtt_end - 1);

			DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n",

				      base, base + (u32) dev_priv->gtt.stolen_size - 1);

		}

	}

#if 0

	/* Verify that nothing else uses this physical address. Stolen

	 * memory should be reserved by the BIOS and hidden from the

	 * kernel. So if the region is already marked as busy, something

	 * is seriously wrong.

	 */

	r = devm_request_mem_region(dev->dev, base, dev_priv->gtt.stolen_size,

				    "Graphics Stolen Memory");

	if (r == NULL) {

		/*

		 * One more attempt but this time requesting region from

		 * base + 1, as we have seen that this resolves the region

		 * conflict with the PCI Bus.

		 * This is a BIOS w/a: Some BIOS wrap stolen in the root

		 * PCI bus, but have an off-by-one error. Hence retry the

		 * reservation starting from 1 instead of 0.

		 */

		r = devm_request_mem_region(dev->dev, base + 1,

					    dev_priv->gtt.stolen_size - 1,

					    "Graphics Stolen Memory");

		/*

		 * GEN3 firmware likes to smash pci bridges into the stolen

		 * range. Apparently this works.

		 */

		if (r == NULL && !IS_GEN3(dev)) {

			DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n",

				  base, base + (uint32_t)dev_priv->gtt.stolen_size);

			base = 0;

		}

	}

#endif

	return base;

}

void i915_gem_cleanup_stolen(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	if (!drm_mm_initialized(&dev_priv->mm.stolen))

		return;

	drm_mm_takedown(&dev_priv->mm.stolen);

}

static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv,

				    unsigned long *base, unsigned long *size)

{

	uint32_t reg_val = I915_READ(IS_GM45(dev_priv) ?

				     CTG_STOLEN_RESERVED :

				     ELK_STOLEN_RESERVED);

	unsigned long stolen_top = dev_priv->mm.stolen_base +

		dev_priv->gtt.stolen_size;

	*base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;

	WARN_ON((reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base);

	/* On these platforms, the register doesn't have a size field, so the

	 * size is the distance between the base and the top of the stolen

	 * memory. We also have the genuine case where base is zero and there's

	 * nothing reserved. */

	if (*base == 0)

		*size = 0;

	else

		*size = stolen_top - *base;

}

static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv,

				     unsigned long *base, unsigned long *size)

{

	uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);

	*base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;

	switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) {

	case GEN6_STOLEN_RESERVED_1M:

		*size = 1024 * 1024;

		break;

	case GEN6_STOLEN_RESERVED_512K:

		*size = 512 * 1024;

		break;

	case GEN6_STOLEN_RESERVED_256K:

		*size = 256 * 1024;

		break;

	case GEN6_STOLEN_RESERVED_128K:

		*size = 128 * 1024;

		break;

	default:

		*size = 1024 * 1024;

		MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK);

	}

}

static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv,

				     unsigned long *base, unsigned long *size)

{

	uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);

	*base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK;

	switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {

	case GEN7_STOLEN_RESERVED_1M:

		*size = 1024 * 1024;

		break;

	case GEN7_STOLEN_RESERVED_256K:

		*size = 256 * 1024;

		break;

	default:

		*size = 1024 * 1024;

		MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);

	}

}

static void gen8_get_stolen_reserved(struct drm_i915_private *dev_priv,

				     unsigned long *base, unsigned long *size)

{

	uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);

	*base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;

	switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {

	case GEN8_STOLEN_RESERVED_1M:

		*size = 1024 * 1024;

		break;

	case GEN8_STOLEN_RESERVED_2M:

		*size = 2 * 1024 * 1024;

		break;

	case GEN8_STOLEN_RESERVED_4M:

		*size = 4 * 1024 * 1024;

		break;

	case GEN8_STOLEN_RESERVED_8M:

		*size = 8 * 1024 * 1024;

		break;

	default:

		*size = 8 * 1024 * 1024;

		MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);

	}

}

static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv,

				    unsigned long *base, unsigned long *size)

{

	uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);

	unsigned long stolen_top;

	stolen_top = dev_priv->mm.stolen_base + dev_priv->gtt.stolen_size;

	*base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;

	/* On these platforms, the register doesn't have a size field, so the

	 * size is the distance between the base and the top of the stolen

	 * memory. We also have the genuine case where base is zero and there's

	 * nothing reserved. */

	if (*base == 0)

		*size = 0;

	else

		*size = stolen_top - *base;

}

int i915_gem_init_stolen(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	unsigned long reserved_total, reserved_base = 0, reserved_size;

	unsigned long stolen_top;

	mutex_init(&dev_priv->mm.stolen_lock);

#ifdef CONFIG_INTEL_IOMMU

	if (intel_iommu_gfx_mapped && INTEL_INFO(dev)->gen < 8) {

		DRM_INFO("DMAR active, disabling use of stolen memory\n");

		return 0;

	}

#endif

	if (dev_priv->gtt.stolen_size == 0)

		return 0;

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

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

		return 0;

	stolen_top = dev_priv->mm.stolen_base + dev_priv->gtt.stolen_size;

	switch (INTEL_INFO(dev_priv)->gen) {

	case 2:

	case 3:

		break;

	case 4:

		if (IS_G4X(dev))

			g4x_get_stolen_reserved(dev_priv, &reserved_base,

						&reserved_size);

		break;

	case 5:

		/* Assume the gen6 maximum for the older platforms. */

		reserved_size = 1024 * 1024;

		reserved_base = stolen_top - reserved_size;

		break;

	case 6:

		gen6_get_stolen_reserved(dev_priv, &reserved_base,

					 &reserved_size);

		break;

	case 7:

		gen7_get_stolen_reserved(dev_priv, &reserved_base,

					 &reserved_size);

		break;

	default:

		if (IS_BROADWELL(dev_priv) ||

		    IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev))

			bdw_get_stolen_reserved(dev_priv, &reserved_base,

						&reserved_size);

		else

			gen8_get_stolen_reserved(dev_priv, &reserved_base,

						 &reserved_size);

		break;

	}

	/* It is possible for the reserved base to be zero, but the register

	 * field for size doesn't have a zero option. */

	if (reserved_base == 0) {

		reserved_size = 0;

		reserved_base = stolen_top;

	}

	if (reserved_base < dev_priv->mm.stolen_base ||

	    reserved_base + reserved_size > stolen_top) {

		DRM_DEBUG_KMS("Stolen reserved area [0x%08lx - 0x%08lx] outside stolen memory [0x%08lx - 0x%08lx]\n",

			      reserved_base, reserved_base + reserved_size,

			      dev_priv->mm.stolen_base, stolen_top);

		return 0;

	}

	dev_priv->gtt.stolen_reserved_base = reserved_base;

	dev_priv->gtt.stolen_reserved_size = reserved_size;

	/* It is possible for the reserved area to end before the end of stolen

	 * memory, so just consider the start. */

	reserved_total = stolen_top - reserved_base;

	DRM_DEBUG_KMS("Memory reserved for graphics device: %zuK, usable: %luK\n",

		      dev_priv->gtt.stolen_size >> 10,

		      (dev_priv->gtt.stolen_size - reserved_total) >> 10);

	dev_priv->gtt.stolen_usable_size = dev_priv->gtt.stolen_size -

					   reserved_total;

	/*

	 * Basic memrange allocator for stolen space.

	 *

	 * TODO: Notice that some platforms require us to not use the first page

	 * of the stolen memory but their BIOSes may still put the framebuffer

	 * on the first page. So we don't reserve this page for now because of

	 * that. Our current solution is to just prevent new nodes from being

	 * inserted on the first page - see the check we have at

	 * i915_gem_stolen_insert_node_in_range(). We may want to fix the fbcon

	 * problem later.

	 */

	drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_usable_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 = 0;

	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 void

i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)

{

	struct drm_i915_private *dev_priv = obj->base.dev->dev_private;

	if (obj->stolen) {

		i915_gem_stolen_remove_node(dev_priv, obj->stolen);

		kfree(obj->stolen);

		obj->stolen = NULL;

	}

}

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,

	.release = i915_gem_object_release_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;

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

	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->get_page.sg = obj->pages->sgl;

	obj->get_page.last = 0;

	i915_gem_object_pin_pages(obj);

	obj->stolen = stolen;

	obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;

	obj->cache_level = HAS_LLC(dev) ? I915_CACHE_LLC : 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;

	int ret;

	if (!drm_mm_initialized(&dev_priv->mm.stolen))

		return NULL;

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

	if (size == 0)

		return NULL;

	stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);

	if (!stolen)

		return NULL;

	ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096);

	if (ret) {

		kfree(stolen);

		return NULL;

	}

	obj = _i915_gem_object_create_stolen(dev, stolen);

	if (obj)

		return obj;

	i915_gem_stolen_remove_node(dev_priv, stolen);

	kfree(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 i915_address_space *ggtt = &dev_priv->gtt.base;

	struct drm_i915_gem_object *obj;

	struct drm_mm_node *stolen;

	struct i915_vma *vma;

	int ret;

	if (!drm_mm_initialized(&dev_priv->mm.stolen))

		return NULL;

	lockdep_assert_held(&dev->struct_mutex);

	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 */

	if (WARN_ON(size == 0) || WARN_ON(size & 4095) ||

	    WARN_ON(stolen_offset & 4095))

		return NULL;

	stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);

	if (!stolen)

		return NULL;

	stolen->start = stolen_offset;

	stolen->size = size;

	mutex_lock(&dev_priv->mm.stolen_lock);

	ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);

	mutex_unlock(&dev_priv->mm.stolen_lock);

	if (ret) {

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

		kfree(stolen);

		return NULL;

	}

	obj = _i915_gem_object_create_stolen(dev, stolen);

	if (obj == NULL) {

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

		i915_gem_stolen_remove_node(dev_priv, stolen);

		kfree(stolen);

		return NULL;

	}

	/* Some objects just need physical mem from stolen space */

	if (gtt_offset == I915_GTT_OFFSET_NONE)

		return obj;

	vma = i915_gem_obj_lookup_or_create_vma(obj, ggtt);

	if (IS_ERR(vma)) {

		ret = PTR_ERR(vma);

		goto err;

	}

	/* 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.

	 */

	vma->node.start = gtt_offset;

	vma->node.size = size;

	if (drm_mm_initialized(&ggtt->mm)) {

		ret = drm_mm_reserve_node(&ggtt->mm, &vma->node);

		if (ret) {

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

			goto err;

		}

		vma->bound |= GLOBAL_BIND;

		__i915_vma_set_map_and_fenceable(vma);

		list_add_tail(&vma->vm_link, &ggtt->inactive_list);

	}

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

	i915_gem_object_pin_pages(obj);

	return obj;

err:

	drm_gem_object_unreference(&obj->base);

	return NULL;

}