[deliverable/linux.git] / drivers / gpu / drm / i915 / i915_gem_stolen.c

/*
 * 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 <eric@anholt.net>
 *    Chris Wilson <chris@chris-wilson.co.uk>
 *
 */

#include <drm/drmP.h>
#include <drm/i915_drm.h>
#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.
 */

int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv,
				struct drm_mm_node *node, u64 size,
				unsigned alignment)
{
	int ret;

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

	mutex_lock(&dev_priv->mm.stolen_lock);
	ret = drm_mm_insert_node(&dev_priv->mm.stolen, node, size, alignment,
				 DRM_MM_SEARCH_DEFAULT);
	mutex_unlock(&dev_priv->mm.stolen_lock);

	return ret;
}

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 gen2, the layout is again 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 However gen2 requires an unavailable symbol.
	 */
	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);
		}
	}


	/* 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;
		}
	}

	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);
}

int i915_gem_init_stolen(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 tmp;
	int bios_reserved = 0;

	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;

	DRM_DEBUG_KMS("found %zd bytes of stolen memory at %08lx\n",
		      dev_priv->gtt.stolen_size, dev_priv->mm.stolen_base);

	if (INTEL_INFO(dev)->gen >= 8) {
		tmp = I915_READ(GEN7_BIOS_RESERVED);
		tmp >>= GEN8_BIOS_RESERVED_SHIFT;
		tmp &= GEN8_BIOS_RESERVED_MASK;
		bios_reserved = (1024*1024) << tmp;
	} else if (IS_GEN7(dev)) {
		tmp = I915_READ(GEN7_BIOS_RESERVED);
		bios_reserved = tmp & GEN7_BIOS_RESERVED_256K ?
			256*1024 : 1024*1024;
	}

	if (WARN_ON(bios_reserved > dev_priv->gtt.stolen_size))
		return 0;

	/* Basic memrange allocator for stolen space */
	drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_size -
		    bios_reserved);

	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->has_dma_mapping = true;
	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;

	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_out;
	}

	/* 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;
		}
	}

	vma->bound |= GLOBAL_BIND;

	list_add_tail(&obj->global_list, &dev_priv->mm.bound_list);
	list_add_tail(&vma->mm_list, &ggtt->inactive_list);
	i915_gem_object_pin_pages(obj);

	return obj;

err_vma:
	i915_gem_vma_destroy(vma);
err_out:
	i915_gem_stolen_remove_node(dev_priv, stolen);
	kfree(stolen);
	drm_gem_object_unreference(&obj->base);
	return NULL;
}
Commit	Line	Data
9797fbfb CW	1	/*
	2	* Copyright © 2008-2012 Intel Corporation
	3	*
	4	* Permission is hereby granted, free of charge, to any person obtaining a
	5	* copy of this software and associated documentation files (the "Software"),
	6	* to deal in the Software without restriction, including without limitation
	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
	9	* Software is furnished to do so, subject to the following conditions:
	10	*
	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
	13	* Software.
	14	*
	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,
	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
	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
	21	* IN THE SOFTWARE.
	22	*
	23	* Authors:
	24	* Eric Anholt <eric@anholt.net>
	25	* Chris Wilson <chris@chris-wilson.co.uk>
	26	*
	27	*/
	28
760285e7 DH	29	#include <drm/drmP.h>
760285e7 DH	30	#include <drm/i915_drm.h>
9797fbfb CW	31	#include "i915_drv.h"
	32
	33	/*
	34	* The BIOS typically reserves some of the system's memory for the exclusive
	35	* use of the integrated graphics. This memory is no longer available for
	36	* use by the OS and so the user finds that his system has less memory
	37	* available than he put in. We refer to this memory as stolen.
	38	*
	39	* The BIOS will allocate its framebuffer from the stolen memory. Our
	40	* goal is try to reuse that object for our own fbcon which must always
	41	* be available for panics. Anything else we can reuse the stolen memory
	42	* for is a boon.
	43	*/
	44
d713fd49 PZ	45	int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv,
	46	struct drm_mm_node *node, u64 size,
	47	unsigned alignment)
	48	{
92e97d2f PZ	49	int ret;
92e97d2f PZ	50
d713fd49 PZ	51	if (!drm_mm_initialized(&dev_priv->mm.stolen))
	52	return -ENODEV;
	53
92e97d2f PZ	54	mutex_lock(&dev_priv->mm.stolen_lock);
	55	ret = drm_mm_insert_node(&dev_priv->mm.stolen, node, size, alignment,
	56	DRM_MM_SEARCH_DEFAULT);
	57	mutex_unlock(&dev_priv->mm.stolen_lock);
	58
	59	return ret;
d713fd49 PZ	60	}
	61
	62	void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv,
	63	struct drm_mm_node *node)
	64	{
92e97d2f	65	mutex_lock(&dev_priv->mm.stolen_lock);
d713fd49	66	drm_mm_remove_node(node);
92e97d2f	67	mutex_unlock(&dev_priv->mm.stolen_lock);
d713fd49 PZ	68	}
d713fd49 PZ	69
e12a2d53	70	static unsigned long i915_stolen_to_physical(struct drm_device *dev)
9797fbfb CW	71	{
9797fbfb CW	72	struct drm_i915_private *dev_priv = dev->dev_private;
eaba1b8f	73	struct resource *r;
9797fbfb CW	74	u32 base;
9797fbfb CW	75
17fec8a0 CW	76	/* Almost universally we can find the Graphics Base of Stolen Memory
	77	* at offset 0x5c in the igfx configuration space. On a few (desktop)
	78	* machines this is also mirrored in the bridge device at different
	79	* locations, or in the MCHBAR. On gen2, the layout is again slightly
	80	* different with the Graphics Segment immediately following Top of
	81	* Memory (or Top of Usable DRAM). Note it appears that TOUD is only
	82	* reported by 865g, so we just use the top of memory as determined
	83	* by the e820 probe.
e12a2d53	84	*
17fec8a0	85	* XXX However gen2 requires an unavailable symbol.
9797fbfb	86	*/
e12a2d53	87	base = 0;
17fec8a0 CW	88	if (INTEL_INFO(dev)->gen >= 3) {
17fec8a0 CW	89	/* Read Graphics Base of Stolen Memory directly */
c9cddffc JB	90	pci_read_config_dword(dev->pdev, 0x5c, &base);
c9cddffc JB	91	base &= ~((1<<20) - 1);
17fec8a0	92	} else { /* GEN2 */
e12a2d53	93	#if 0
e12a2d53 CW	94	/* Stolen is immediately above Top of Memory */
e12a2d53 CW	95	base = max_low_pfn_mapped << PAGE_SHIFT;
9797fbfb	96	#endif
e12a2d53	97	}
9797fbfb	98
eaba1b8f CW	99	if (base == 0)
	100	return 0;
	101
f1e1c212 VS	102	/* make sure we don't clobber the GTT if it's within stolen memory */
	103	if (INTEL_INFO(dev)->gen <= 4 && !IS_G33(dev) && !IS_G4X(dev)) {
	104	struct {
	105	u32 start, end;
	106	} stolen[2] = {
	107	{ .start = base, .end = base + dev_priv->gtt.stolen_size, },
	108	{ .start = base, .end = base + dev_priv->gtt.stolen_size, },
	109	};
	110	u64 gtt_start, gtt_end;
	111
	112	gtt_start = I915_READ(PGTBL_CTL);
	113	if (IS_GEN4(dev))
	114	gtt_start = (gtt_start & PGTBL_ADDRESS_LO_MASK) \|
	115	(gtt_start & PGTBL_ADDRESS_HI_MASK) << 28;
	116	else
	117	gtt_start &= PGTBL_ADDRESS_LO_MASK;
	118	gtt_end = gtt_start + gtt_total_entries(dev_priv->gtt) * 4;
	119
	120	if (gtt_start >= stolen[0].start && gtt_start < stolen[0].end)
	121	stolen[0].end = gtt_start;
	122	if (gtt_end > stolen[1].start && gtt_end <= stolen[1].end)
	123	stolen[1].start = gtt_end;
	124
	125	/* pick the larger of the two chunks */
	126	if (stolen[0].end - stolen[0].start >
	127	stolen[1].end - stolen[1].start) {
	128	base = stolen[0].start;
	129	dev_priv->gtt.stolen_size = stolen[0].end - stolen[0].start;
	130	} else {
	131	base = stolen[1].start;
	132	dev_priv->gtt.stolen_size = stolen[1].end - stolen[1].start;
	133	}
	134
	135	if (stolen[0].start != stolen[1].start \|\|
	136	stolen[0].end != stolen[1].end) {
	137	DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n",
	138	(unsigned long long) gtt_start,
	139	(unsigned long long) gtt_end - 1);
	140	DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n",
	141	base, base + (u32) dev_priv->gtt.stolen_size - 1);
	142	}
	143	}
	144
	145
eaba1b8f CW	146	/* Verify that nothing else uses this physical address. Stolen
	147	* memory should be reserved by the BIOS and hidden from the
	148	* kernel. So if the region is already marked as busy, something
	149	* is seriously wrong.
	150	*/
	151	r = devm_request_mem_region(dev->dev, base, dev_priv->gtt.stolen_size,
	152	"Graphics Stolen Memory");
	153	if (r == NULL) {
3617dc96 AG	154	/*
	155	* One more attempt but this time requesting region from
	156	* base + 1, as we have seen that this resolves the region
	157	* conflict with the PCI Bus.
	158	* This is a BIOS w/a: Some BIOS wrap stolen in the root
	159	* PCI bus, but have an off-by-one error. Hence retry the
	160	* reservation starting from 1 instead of 0.
	161	*/
	162	r = devm_request_mem_region(dev->dev, base + 1,
	163	dev_priv->gtt.stolen_size - 1,
	164	"Graphics Stolen Memory");
0b6d24c0 DV	165	/*
	166	* GEN3 firmware likes to smash pci bridges into the stolen
	167	* range. Apparently this works.
	168	*/
	169	if (r == NULL && !IS_GEN3(dev)) {
3617dc96 AG	170	DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n",
	171	base, base + (uint32_t)dev_priv->gtt.stolen_size);
	172	base = 0;
	173	}
eaba1b8f CW	174	}
eaba1b8f CW	175
e12a2d53	176	return base;
9797fbfb CW	177	}
9797fbfb CW	178
9797fbfb CW	179	void i915_gem_cleanup_stolen(struct drm_device *dev)
9797fbfb CW	180	{
4d7bb011 DV	181	struct drm_i915_private *dev_priv = dev->dev_private;
4d7bb011 DV	182
446f8d81 DV	183	if (!drm_mm_initialized(&dev_priv->mm.stolen))
	184	return;
	185
4d7bb011	186	drm_mm_takedown(&dev_priv->mm.stolen);
9797fbfb CW	187	}
	188
	189	int i915_gem_init_stolen(struct drm_device *dev)
	190	{
	191	struct drm_i915_private *dev_priv = dev->dev_private;
40bae736	192	u32 tmp;
c9cddffc	193	int bios_reserved = 0;
9797fbfb	194
92e97d2f PZ	195	mutex_init(&dev_priv->mm.stolen_lock);
92e97d2f PZ	196
0f4706d2	197	#ifdef CONFIG_INTEL_IOMMU
fcc9fe1a	198	if (intel_iommu_gfx_mapped && INTEL_INFO(dev)->gen < 8) {
0f4706d2 CW	199	DRM_INFO("DMAR active, disabling use of stolen memory\n");
	200	return 0;
	201	}
	202	#endif
	203
6644a4e9 CW	204	if (dev_priv->gtt.stolen_size == 0)
	205	return 0;
	206
e12a2d53 CW	207	dev_priv->mm.stolen_base = i915_stolen_to_physical(dev);
	208	if (dev_priv->mm.stolen_base == 0)
	209	return 0;
	210
a54c0c27 BW	211	DRM_DEBUG_KMS("found %zd bytes of stolen memory at %08lx\n",
a54c0c27 BW	212	dev_priv->gtt.stolen_size, dev_priv->mm.stolen_base);
e12a2d53	213
40bae736 DV	214	if (INTEL_INFO(dev)->gen >= 8) {
	215	tmp = I915_READ(GEN7_BIOS_RESERVED);
	216	tmp >>= GEN8_BIOS_RESERVED_SHIFT;
	217	tmp &= GEN8_BIOS_RESERVED_MASK;
	218	bios_reserved = (1024*1024) << tmp;
	219	} else if (IS_GEN7(dev)) {
	220	tmp = I915_READ(GEN7_BIOS_RESERVED);
	221	bios_reserved = tmp & GEN7_BIOS_RESERVED_256K ?
	222	2561024 : 10241024;
	223	}
c9cddffc	224
897f9ed0 DV	225	if (WARN_ON(bios_reserved > dev_priv->gtt.stolen_size))
	226	return 0;
	227
9797fbfb	228	/* Basic memrange allocator for stolen space */
c9cddffc JB	229	drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_size -
c9cddffc JB	230	bios_reserved);
9797fbfb CW	231
	232	return 0;
	233	}
0104fdbb CW	234
	235	static struct sg_table *
	236	i915_pages_create_for_stolen(struct drm_device *dev,
	237	u32 offset, u32 size)
	238	{
	239	struct drm_i915_private *dev_priv = dev->dev_private;
	240	struct sg_table *st;
	241	struct scatterlist *sg;
	242
	243	DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size);
a54c0c27	244	BUG_ON(offset > dev_priv->gtt.stolen_size - size);
0104fdbb CW	245
	246	/* We hide that we have no struct page backing our stolen object
	247	* by wrapping the contiguous physical allocation with a fake
	248	* dma mapping in a single scatterlist.
	249	*/
	250
	251	st = kmalloc(sizeof(*st), GFP_KERNEL);
	252	if (st == NULL)
	253	return NULL;
	254
	255	if (sg_alloc_table(st, 1, GFP_KERNEL)) {
	256	kfree(st);
	257	return NULL;
	258	}
	259
	260	sg = st->sgl;
ec14ba47	261	sg->offset = 0;
ed23abdd	262	sg->length = size;
0104fdbb CW	263
	264	sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset;
	265	sg_dma_len(sg) = size;
	266
	267	return st;
	268	}
	269
	270	static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
	271	{
	272	BUG();
	273	return -EINVAL;
	274	}
	275
	276	static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj)
	277	{
	278	/* Should only be called during free */
	279	sg_free_table(obj->pages);
	280	kfree(obj->pages);
	281	}
	282
ef0cf27c CW	283
	284	static void
	285	i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
	286	{
d713fd49 PZ	287	struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
d713fd49 PZ	288
ef0cf27c	289	if (obj->stolen) {
d713fd49	290	i915_gem_stolen_remove_node(dev_priv, obj->stolen);
ef0cf27c CW	291	kfree(obj->stolen);
	292	obj->stolen = NULL;
	293	}
	294	}
0104fdbb CW	295	static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
	296	.get_pages = i915_gem_object_get_pages_stolen,
	297	.put_pages = i915_gem_object_put_pages_stolen,
ef0cf27c	298	.release = i915_gem_object_release_stolen,
0104fdbb CW	299	};
	300
	301	static struct drm_i915_gem_object *
	302	_i915_gem_object_create_stolen(struct drm_device *dev,
	303	struct drm_mm_node *stolen)
	304	{
	305	struct drm_i915_gem_object *obj;
	306
42dcedd4	307	obj = i915_gem_object_alloc(dev);
0104fdbb CW	308	if (obj == NULL)
	309	return NULL;
	310
89c8233f	311	drm_gem_private_object_init(dev, &obj->base, stolen->size);
0104fdbb CW	312	i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
	313
	314	obj->pages = i915_pages_create_for_stolen(dev,
	315	stolen->start, stolen->size);
	316	if (obj->pages == NULL)
	317	goto cleanup;
	318
	319	obj->has_dma_mapping = true;
dd53e1b0	320	i915_gem_object_pin_pages(obj);
0104fdbb CW	321	obj->stolen = stolen;
0104fdbb CW	322
d46f1c3f CW	323	obj->base.read_domains = I915_GEM_DOMAIN_CPU \| I915_GEM_DOMAIN_GTT;
d46f1c3f CW	324	obj->cache_level = HAS_LLC(dev) ? I915_CACHE_LLC : I915_CACHE_NONE;
0104fdbb CW	325
	326	return obj;
	327
	328	cleanup:
42dcedd4	329	i915_gem_object_free(obj);
0104fdbb CW	330	return NULL;
	331	}
	332
	333	struct drm_i915_gem_object *
	334	i915_gem_object_create_stolen(struct drm_device *dev, u32 size)
	335	{
	336	struct drm_i915_private *dev_priv = dev->dev_private;
	337	struct drm_i915_gem_object *obj;
	338	struct drm_mm_node *stolen;
06e78edf	339	int ret;
0104fdbb	340
446f8d81	341	if (!drm_mm_initialized(&dev_priv->mm.stolen))
0104fdbb CW	342	return NULL;
	343
	344	DRM_DEBUG_KMS("creating stolen object: size=%x\n", size);
	345	if (size == 0)
	346	return NULL;
	347
06e78edf DH	348	stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
06e78edf DH	349	if (!stolen)
0104fdbb CW	350	return NULL;
0104fdbb CW	351
d713fd49	352	ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096);
06e78edf DH	353	if (ret) {
	354	kfree(stolen);
	355	return NULL;
	356	}
	357
0104fdbb CW	358	obj = _i915_gem_object_create_stolen(dev, stolen);
	359	if (obj)
	360	return obj;
	361
d713fd49	362	i915_gem_stolen_remove_node(dev_priv, stolen);
06e78edf	363	kfree(stolen);
0104fdbb CW	364	return NULL;
	365	}
	366
866d12b4 CW	367	struct drm_i915_gem_object *
	368	i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
	369	u32 stolen_offset,
	370	u32 gtt_offset,
	371	u32 size)
	372	{
	373	struct drm_i915_private *dev_priv = dev->dev_private;
40d74980	374	struct i915_address_space *ggtt = &dev_priv->gtt.base;
866d12b4 CW	375	struct drm_i915_gem_object *obj;
866d12b4 CW	376	struct drm_mm_node *stolen;
2f633156	377	struct i915_vma *vma;
b3a070cc	378	int ret;
866d12b4	379
446f8d81	380	if (!drm_mm_initialized(&dev_priv->mm.stolen))
866d12b4 CW	381	return NULL;
	382
	383	DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
	384	stolen_offset, gtt_offset, size);
	385
	386	/* KISS and expect everything to be page-aligned */
f37b5c2b DV	387	if (WARN_ON(size == 0) \|\| WARN_ON(size & 4095) \|\|
f37b5c2b DV	388	WARN_ON(stolen_offset & 4095))
866d12b4 CW	389	return NULL;
866d12b4 CW	390
b3a070cc BW	391	stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
	392	if (!stolen)
	393	return NULL;
	394
338710e7 BW	395	stolen->start = stolen_offset;
338710e7 BW	396	stolen->size = size;
92e97d2f	397	mutex_lock(&dev_priv->mm.stolen_lock);
338710e7	398	ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);
92e97d2f	399	mutex_unlock(&dev_priv->mm.stolen_lock);
b3a070cc	400	if (ret) {
866d12b4	401	DRM_DEBUG_KMS("failed to allocate stolen space\n");
b3a070cc	402	kfree(stolen);
866d12b4 CW	403	return NULL;
	404	}
	405
	406	obj = _i915_gem_object_create_stolen(dev, stolen);
	407	if (obj == NULL) {
	408	DRM_DEBUG_KMS("failed to allocate stolen object\n");
d713fd49	409	i915_gem_stolen_remove_node(dev_priv, stolen);
06e78edf	410	kfree(stolen);
866d12b4 CW	411	return NULL;
	412	}
	413
3727d55e	414	/* Some objects just need physical mem from stolen space */
190d6cd5	415	if (gtt_offset == I915_GTT_OFFSET_NONE)
3727d55e JB	416	return obj;
3727d55e JB	417
e656a6cb	418	vma = i915_gem_obj_lookup_or_create_vma(obj, ggtt);
db473b36 DC	419	if (IS_ERR(vma)) {
db473b36 DC	420	ret = PTR_ERR(vma);
2f633156 BW	421	goto err_out;
	422	}
	423
866d12b4 CW	424	/* To simplify the initialisation sequence between KMS and GTT,
	425	* we allow construction of the stolen object prior to
	426	* setting up the GTT space. The actual reservation will occur
	427	* later.
	428	*/
2f633156 BW	429	vma->node.start = gtt_offset;
2f633156 BW	430	vma->node.size = size;
40d74980 BW	431	if (drm_mm_initialized(&ggtt->mm)) {
40d74980 BW	432	ret = drm_mm_reserve_node(&ggtt->mm, &vma->node);
b3a070cc	433	if (ret) {
866d12b4	434	DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
4a025e26	435	goto err_vma;
866d12b4	436	}
edd41a87	437	}
866d12b4	438
aff43766	439	vma->bound \|= GLOBAL_BIND;
866d12b4	440
35c20a60	441	list_add_tail(&obj->global_list, &dev_priv->mm.bound_list);
ca191b13	442	list_add_tail(&vma->mm_list, &ggtt->inactive_list);
d8ccba86	443	i915_gem_object_pin_pages(obj);
866d12b4 CW	444
866d12b4 CW	445	return obj;
b3a070cc	446
4a025e26 DV	447	err_vma:
4a025e26 DV	448	i915_gem_vma_destroy(vma);
f7f18184	449	err_out:
d713fd49	450	i915_gem_stolen_remove_node(dev_priv, stolen);
32c913e4	451	kfree(stolen);
b3a070cc BW	452	drm_gem_object_unreference(&obj->base);
b3a070cc BW	453	return NULL;
866d12b4	454	}