/*
* 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"
#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;
}