linux/drivers/gpu/drm/i915/i915_gem_stolen.c

662 lines
18 KiB
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_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;
mutex_lock(&dev_priv->mm.stolen_lock);
ret = drm_mm_insert_node_in_range(&dev_priv->mm.stolen, node,
size, alignment, 0,
start, end, DRM_MM_INSERT_BEST);
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, U64_MAX);
}
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 int i915_adjust_stolen(struct drm_i915_private *dev_priv,
struct resource *dsm)
{
struct i915_ggtt *ggtt = &dev_priv->ggtt;
struct resource *r;
if (dsm->start == 0 || dsm->end <= dsm->start)
return -EINVAL;
/*
* TODO: We have yet too encounter the case where the GTT wasn't at the
* end of stolen. With that assumption we could simplify this.
*/
/* Make sure we don't clobber the GTT if it's within stolen memory */
if (INTEL_GEN(dev_priv) <= 4 &&
!IS_G33(dev_priv) && !IS_PINEVIEW(dev_priv) && !IS_G4X(dev_priv)) {
struct resource stolen[2] = {*dsm, *dsm};
struct resource ggtt_res;
resource_size_t ggtt_start;
ggtt_start = I915_READ(PGTBL_CTL);
if (IS_GEN4(dev_priv))
ggtt_start = (ggtt_start & PGTBL_ADDRESS_LO_MASK) |
(ggtt_start & PGTBL_ADDRESS_HI_MASK) << 28;
else
ggtt_start &= PGTBL_ADDRESS_LO_MASK;
ggtt_res =
(struct resource) DEFINE_RES_MEM(ggtt_start,
ggtt_total_entries(ggtt) * 4);
if (ggtt_res.start >= stolen[0].start && ggtt_res.start < stolen[0].end)
stolen[0].end = ggtt_res.start;
if (ggtt_res.end > stolen[1].start && ggtt_res.end <= stolen[1].end)
stolen[1].start = ggtt_res.end;
/* Pick the larger of the two chunks */
if (resource_size(&stolen[0]) > resource_size(&stolen[1]))
*dsm = stolen[0];
else
*dsm = stolen[1];
if (stolen[0].start != stolen[1].start ||
stolen[0].end != stolen[1].end) {
DRM_DEBUG_KMS("GTT within stolen memory at %pR\n", &ggtt_res);
DRM_DEBUG_KMS("Stolen memory adjusted to %pR\n", dsm);
}
}
/*
* 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_priv->drm.dev, dsm->start,
resource_size(dsm),
"Graphics Stolen Memory");
if (r == NULL) {
/*
* One more attempt but this time requesting region from
* start + 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.
* There's also BIOS with off-by-one on the other end.
*/
r = devm_request_mem_region(dev_priv->drm.dev, dsm->start + 1,
resource_size(dsm) - 2,
"Graphics Stolen Memory");
/*
* GEN3 firmware likes to smash pci bridges into the stolen
* range. Apparently this works.
*/
if (r == NULL && !IS_GEN3(dev_priv)) {
DRM_ERROR("conflict detected with stolen region: %pR\n",
dsm);
return -EBUSY;
}
}
return 0;
}
void i915_gem_cleanup_stolen(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = to_i915(dev);
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,
resource_size_t *base, resource_size_t *size)
{
uint32_t reg_val = I915_READ(IS_GM45(dev_priv) ?
CTG_STOLEN_RESERVED :
ELK_STOLEN_RESERVED);
resource_size_t stolen_top = dev_priv->dsm.end + 1;
if ((reg_val & G4X_STOLEN_RESERVED_ENABLE) == 0) {
*base = 0;
*size = 0;
return;
}
/*
* Whether ILK really reuses the ELK register for this is unclear.
* Let's see if we catch anyone with this supposedly enabled on ILK.
*/
WARN(IS_GEN5(dev_priv), "ILK stolen reserved found? 0x%08x\n", reg_val);
*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,
resource_size_t *base, resource_size_t *size)
{
uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
if ((reg_val & GEN6_STOLEN_RESERVED_ENABLE) == 0) {
*base = 0;
*size = 0;
return;
}
*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,
resource_size_t *base, resource_size_t *size)
{
uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
if ((reg_val & GEN6_STOLEN_RESERVED_ENABLE) == 0) {
*base = 0;
*size = 0;
return;
}
*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 chv_get_stolen_reserved(struct drm_i915_private *dev_priv,
resource_size_t *base, resource_size_t *size)
{
uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
if ((reg_val & GEN6_STOLEN_RESERVED_ENABLE) == 0) {
*base = 0;
*size = 0;
return;
}
*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,
resource_size_t *base, resource_size_t *size)
{
uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
resource_size_t stolen_top;
if ((reg_val & GEN6_STOLEN_RESERVED_ENABLE) == 0) {
*base = 0;
*size = 0;
return;
}
stolen_top = dev_priv->dsm.end + 1;
*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_i915_private *dev_priv)
{
resource_size_t reserved_base, stolen_top;
resource_size_t reserved_total, reserved_size;
resource_size_t stolen_usable_start;
mutex_init(&dev_priv->mm.stolen_lock);
if (intel_vgpu_active(dev_priv)) {
DRM_INFO("iGVT-g active, disabling use of stolen memory\n");
return 0;
}
if (intel_vtd_active() && INTEL_GEN(dev_priv) < 8) {
DRM_INFO("DMAR active, disabling use of stolen memory\n");
return 0;
}
if (resource_size(&intel_graphics_stolen_res) == 0)
return 0;
dev_priv->dsm = intel_graphics_stolen_res;
if (i915_adjust_stolen(dev_priv, &dev_priv->dsm))
return 0;
GEM_BUG_ON(dev_priv->dsm.start == 0);
GEM_BUG_ON(dev_priv->dsm.end <= dev_priv->dsm.start);
stolen_top = dev_priv->dsm.end + 1;
reserved_base = 0;
reserved_size = 0;
switch (INTEL_INFO(dev_priv)->gen) {
case 2:
case 3:
break;
case 4:
if (!IS_G4X(dev_priv))
break;
/* fall through */
case 5:
g4x_get_stolen_reserved(dev_priv,
&reserved_base, &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_LP(dev_priv))
chv_get_stolen_reserved(dev_priv,
&reserved_base, &reserved_size);
else
bdw_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;
}
dev_priv->dsm_reserved =
(struct resource) DEFINE_RES_MEM(reserved_base, reserved_size);
if (!resource_contains(&dev_priv->dsm, &dev_priv->dsm_reserved)) {
DRM_ERROR("Stolen reserved area %pR outside stolen memory %pR\n",
&dev_priv->dsm_reserved, &dev_priv->dsm);
return 0;
}
/* 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: %lluK, usable: %lluK\n",
(u64)resource_size(&dev_priv->dsm) >> 10,
((u64)resource_size(&dev_priv->dsm) - reserved_total) >> 10);
stolen_usable_start = 0;
/* WaSkipStolenMemoryFirstPage:bdw+ */
if (INTEL_GEN(dev_priv) >= 8)
stolen_usable_start = 4096;
dev_priv->stolen_usable_size =
resource_size(&dev_priv->dsm) - reserved_total - stolen_usable_start;
/* Basic memrange allocator for stolen space. */
drm_mm_init(&dev_priv->mm.stolen, stolen_usable_start,
dev_priv->stolen_usable_size);
return 0;
}
static struct sg_table *
i915_pages_create_for_stolen(struct drm_device *dev,
resource_size_t offset, resource_size_t size)
{
struct drm_i915_private *dev_priv = to_i915(dev);
struct sg_table *st;
struct scatterlist *sg;
GEM_BUG_ON(range_overflows(offset, size, resource_size(&dev_priv->dsm)));
/* 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 ERR_PTR(-ENOMEM);
if (sg_alloc_table(st, 1, GFP_KERNEL)) {
kfree(st);
return ERR_PTR(-ENOMEM);
}
sg = st->sgl;
sg->offset = 0;
sg->length = size;
sg_dma_address(sg) = (dma_addr_t)dev_priv->dsm.start + offset;
sg_dma_len(sg) = size;
return st;
}
static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
{
struct sg_table *pages =
i915_pages_create_for_stolen(obj->base.dev,
obj->stolen->start,
obj->stolen->size);
if (IS_ERR(pages))
return PTR_ERR(pages);
__i915_gem_object_set_pages(obj, pages, obj->stolen->size);
return 0;
}
static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj,
struct sg_table *pages)
{
/* Should only be called from i915_gem_object_release_stolen() */
sg_free_table(pages);
kfree(pages);
}
static void
i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
{
struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
struct drm_mm_node *stolen = fetch_and_zero(&obj->stolen);
GEM_BUG_ON(!stolen);
__i915_gem_object_unpin_pages(obj);
i915_gem_stolen_remove_node(dev_priv, stolen);
kfree(stolen);
}
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_i915_private *dev_priv,
struct drm_mm_node *stolen)
{
struct drm_i915_gem_object *obj;
unsigned int cache_level;
obj = i915_gem_object_alloc(dev_priv);
if (obj == NULL)
return NULL;
drm_gem_private_object_init(&dev_priv->drm, &obj->base, stolen->size);
i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
obj->stolen = stolen;
obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
cache_level = HAS_LLC(dev_priv) ? I915_CACHE_LLC : I915_CACHE_NONE;
i915_gem_object_set_cache_coherency(obj, cache_level);
if (i915_gem_object_pin_pages(obj))
goto cleanup;
return obj;
cleanup:
i915_gem_object_free(obj);
return NULL;
}
struct drm_i915_gem_object *
i915_gem_object_create_stolen(struct drm_i915_private *dev_priv,
resource_size_t size)
{
struct drm_i915_gem_object *obj;
struct drm_mm_node *stolen;
int ret;
if (!drm_mm_initialized(&dev_priv->mm.stolen))
return NULL;
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_priv, 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_i915_private *dev_priv,
resource_size_t stolen_offset,
resource_size_t gtt_offset,
resource_size_t size)
{
struct i915_ggtt *ggtt = &dev_priv->ggtt;
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_priv->drm.struct_mutex);
DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%pa, gtt_offset=%pa, size=%pa\n",
&stolen_offset, &gtt_offset, &size);
/* KISS and expect everything to be page-aligned */
if (WARN_ON(size == 0) ||
WARN_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE)) ||
WARN_ON(!IS_ALIGNED(stolen_offset, I915_GTT_MIN_ALIGNMENT)))
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_priv, 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;
ret = i915_gem_object_pin_pages(obj);
if (ret)
goto err;
vma = i915_vma_instance(obj, &ggtt->base, NULL);
if (IS_ERR(vma)) {
ret = PTR_ERR(vma);
goto err_pages;
}
/* 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.
*/
ret = i915_gem_gtt_reserve(&ggtt->base, &vma->node,
size, gtt_offset, obj->cache_level,
0);
if (ret) {
DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
goto err_pages;
}
GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
vma->pages = obj->mm.pages;
vma->flags |= I915_VMA_GLOBAL_BIND;
__i915_vma_set_map_and_fenceable(vma);
list_move_tail(&vma->vm_link, &ggtt->base.inactive_list);
spin_lock(&dev_priv->mm.obj_lock);
list_move_tail(&obj->mm.link, &dev_priv->mm.bound_list);
obj->bind_count++;
spin_unlock(&dev_priv->mm.obj_lock);
return obj;
err_pages:
i915_gem_object_unpin_pages(obj);
err:
i915_gem_object_put(obj);
return NULL;
}