blob: 84b2707d8b17a16bebe815ccca0a56da11a56867 [file] [log] [blame]
/*
* SPDX-License-Identifier: MIT
*
* Copyright © 2008-2012 Intel Corporation
*/
#include <linux/errno.h>
#include <linux/mutex.h>
#include <drm/drm_mm.h>
#include <drm/i915_drm.h>
#include "gem/i915_gem_region.h"
#include "i915_drv.h"
#include "i915_gem_stolen.h"
#include "i915_vgpu.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 *i915,
struct drm_mm_node *node, u64 size,
unsigned alignment, u64 start, u64 end)
{
int ret;
if (!drm_mm_initialized(&i915->mm.stolen))
return -ENODEV;
/* WaSkipStolenMemoryFirstPage:bdw+ */
if (INTEL_GEN(i915) >= 8 && start < 4096)
start = 4096;
mutex_lock(&i915->mm.stolen_lock);
ret = drm_mm_insert_node_in_range(&i915->mm.stolen, node,
size, alignment, 0,
start, end, DRM_MM_INSERT_BEST);
mutex_unlock(&i915->mm.stolen_lock);
return ret;
}
int i915_gem_stolen_insert_node(struct drm_i915_private *i915,
struct drm_mm_node *node, u64 size,
unsigned alignment)
{
return i915_gem_stolen_insert_node_in_range(i915, node,
size, alignment,
I915_GEM_STOLEN_BIAS,
U64_MAX);
}
void i915_gem_stolen_remove_node(struct drm_i915_private *i915,
struct drm_mm_node *node)
{
mutex_lock(&i915->mm.stolen_lock);
drm_mm_remove_node(node);
mutex_unlock(&i915->mm.stolen_lock);
}
static int i915_adjust_stolen(struct drm_i915_private *i915,
struct resource *dsm)
{
struct i915_ggtt *ggtt = &i915->ggtt;
struct intel_uncore *uncore = ggtt->vm.gt->uncore;
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(i915) <= 4 &&
!IS_G33(i915) && !IS_PINEVIEW(i915) && !IS_G4X(i915)) {
struct resource stolen[2] = {*dsm, *dsm};
struct resource ggtt_res;
resource_size_t ggtt_start;
ggtt_start = intel_uncore_read(uncore, PGTBL_CTL);
if (IS_GEN(i915, 4))
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_dbg(&i915->drm,
"GTT within stolen memory at %pR\n",
&ggtt_res);
drm_dbg(&i915->drm, "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(i915->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(i915->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 && !IS_GEN(i915, 3)) {
drm_err(&i915->drm,
"conflict detected with stolen region: %pR\n",
dsm);
return -EBUSY;
}
}
return 0;
}
static void i915_gem_cleanup_stolen(struct drm_i915_private *i915)
{
if (!drm_mm_initialized(&i915->mm.stolen))
return;
drm_mm_takedown(&i915->mm.stolen);
}
static void g4x_get_stolen_reserved(struct drm_i915_private *i915,
struct intel_uncore *uncore,
resource_size_t *base,
resource_size_t *size)
{
u32 reg_val = intel_uncore_read(uncore,
IS_GM45(i915) ?
CTG_STOLEN_RESERVED :
ELK_STOLEN_RESERVED);
resource_size_t stolen_top = i915->dsm.end + 1;
drm_dbg(&i915->drm, "%s_STOLEN_RESERVED = %08x\n",
IS_GM45(i915) ? "CTG" : "ELK", reg_val);
if ((reg_val & G4X_STOLEN_RESERVED_ENABLE) == 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.
*/
drm_WARN(&i915->drm, IS_GEN(i915, 5),
"ILK stolen reserved found? 0x%08x\n",
reg_val);
if (!(reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK))
return;
*base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;
drm_WARN_ON(&i915->drm,
(reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base);
*size = stolen_top - *base;
}
static void gen6_get_stolen_reserved(struct drm_i915_private *i915,
struct intel_uncore *uncore,
resource_size_t *base,
resource_size_t *size)
{
u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED);
drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val);
if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
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 vlv_get_stolen_reserved(struct drm_i915_private *i915,
struct intel_uncore *uncore,
resource_size_t *base,
resource_size_t *size)
{
u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED);
resource_size_t stolen_top = i915->dsm.end + 1;
drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val);
if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
return;
switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
default:
MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
fallthrough;
case GEN7_STOLEN_RESERVED_1M:
*size = 1024 * 1024;
break;
}
/*
* On vlv, the ADDR_MASK portion is left as 0 and HW deduces the
* reserved location as (top - size).
*/
*base = stolen_top - *size;
}
static void gen7_get_stolen_reserved(struct drm_i915_private *i915,
struct intel_uncore *uncore,
resource_size_t *base,
resource_size_t *size)
{
u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED);
drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val);
if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
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 *i915,
struct intel_uncore *uncore,
resource_size_t *base,
resource_size_t *size)
{
u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED);
drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val);
if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
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 *i915,
struct intel_uncore *uncore,
resource_size_t *base,
resource_size_t *size)
{
u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED);
resource_size_t stolen_top = i915->dsm.end + 1;
drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val);
if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
return;
if (!(reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK))
return;
*base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
*size = stolen_top - *base;
}
static void icl_get_stolen_reserved(struct drm_i915_private *i915,
struct intel_uncore *uncore,
resource_size_t *base,
resource_size_t *size)
{
u64 reg_val = intel_uncore_read64(uncore, GEN6_STOLEN_RESERVED);
drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = 0x%016llx\n", reg_val);
*base = reg_val & GEN11_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 int i915_gem_init_stolen(struct drm_i915_private *i915)
{
struct intel_uncore *uncore = &i915->uncore;
resource_size_t reserved_base, stolen_top;
resource_size_t reserved_total, reserved_size;
mutex_init(&i915->mm.stolen_lock);
if (intel_vgpu_active(i915)) {
drm_notice(&i915->drm,
"%s, disabling use of stolen memory\n",
"iGVT-g active");
return 0;
}
if (intel_vtd_active() && INTEL_GEN(i915) < 8) {
drm_notice(&i915->drm,
"%s, disabling use of stolen memory\n",
"DMAR active");
return 0;
}
if (resource_size(&intel_graphics_stolen_res) == 0)
return 0;
i915->dsm = intel_graphics_stolen_res;
if (i915_adjust_stolen(i915, &i915->dsm))
return 0;
GEM_BUG_ON(i915->dsm.start == 0);
GEM_BUG_ON(i915->dsm.end <= i915->dsm.start);
stolen_top = i915->dsm.end + 1;
reserved_base = stolen_top;
reserved_size = 0;
switch (INTEL_GEN(i915)) {
case 2:
case 3:
break;
case 4:
if (!IS_G4X(i915))
break;
fallthrough;
case 5:
g4x_get_stolen_reserved(i915, uncore,
&reserved_base, &reserved_size);
break;
case 6:
gen6_get_stolen_reserved(i915, uncore,
&reserved_base, &reserved_size);
break;
case 7:
if (IS_VALLEYVIEW(i915))
vlv_get_stolen_reserved(i915, uncore,
&reserved_base, &reserved_size);
else
gen7_get_stolen_reserved(i915, uncore,
&reserved_base, &reserved_size);
break;
case 8:
case 9:
case 10:
if (IS_LP(i915))
chv_get_stolen_reserved(i915, uncore,
&reserved_base, &reserved_size);
else
bdw_get_stolen_reserved(i915, uncore,
&reserved_base, &reserved_size);
break;
default:
MISSING_CASE(INTEL_GEN(i915));
fallthrough;
case 11:
case 12:
icl_get_stolen_reserved(i915, uncore,
&reserved_base,
&reserved_size);
break;
}
/*
* Our expectation is that the reserved space is at the top of the
* stolen region and *never* at the bottom. If we see !reserved_base,
* it likely means we failed to read the registers correctly.
*/
if (!reserved_base) {
drm_err(&i915->drm,
"inconsistent reservation %pa + %pa; ignoring\n",
&reserved_base, &reserved_size);
reserved_base = stolen_top;
reserved_size = 0;
}
i915->dsm_reserved =
(struct resource)DEFINE_RES_MEM(reserved_base, reserved_size);
if (!resource_contains(&i915->dsm, &i915->dsm_reserved)) {
drm_err(&i915->drm,
"Stolen reserved area %pR outside stolen memory %pR\n",
&i915->dsm_reserved, &i915->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_dbg(&i915->drm,
"Memory reserved for graphics device: %lluK, usable: %lluK\n",
(u64)resource_size(&i915->dsm) >> 10,
((u64)resource_size(&i915->dsm) - reserved_total) >> 10);
i915->stolen_usable_size =
resource_size(&i915->dsm) - reserved_total;
/* Basic memrange allocator for stolen space. */
drm_mm_init(&i915->mm.stolen, 0, i915->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 *i915 = to_i915(dev);
struct sg_table *st;
struct scatterlist *sg;
GEM_BUG_ON(range_overflows(offset, size, resource_size(&i915->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)i915->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 *i915 = to_i915(obj->base.dev);
struct drm_mm_node *stolen = fetch_and_zero(&obj->stolen);
GEM_BUG_ON(!stolen);
i915_gem_object_release_memory_region(obj);
i915_gem_stolen_remove_node(i915, stolen);
kfree(stolen);
}
static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
.name = "i915_gem_object_stolen",
.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 intel_memory_region *mem,
struct drm_mm_node *stolen)
{
static struct lock_class_key lock_class;
struct drm_i915_gem_object *obj;
unsigned int cache_level;
int err = -ENOMEM;
obj = i915_gem_object_alloc();
if (!obj)
goto err;
drm_gem_private_object_init(&mem->i915->drm, &obj->base, stolen->size);
i915_gem_object_init(obj, &i915_gem_object_stolen_ops, &lock_class);
obj->stolen = stolen;
obj->read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
cache_level = HAS_LLC(mem->i915) ? I915_CACHE_LLC : I915_CACHE_NONE;
i915_gem_object_set_cache_coherency(obj, cache_level);
err = i915_gem_object_pin_pages(obj);
if (err)
goto cleanup;
i915_gem_object_init_memory_region(obj, mem, 0);
return obj;
cleanup:
i915_gem_object_free(obj);
err:
return ERR_PTR(err);
}
static struct drm_i915_gem_object *
_i915_gem_object_create_stolen(struct intel_memory_region *mem,
resource_size_t size,
unsigned int flags)
{
struct drm_i915_private *i915 = mem->i915;
struct drm_i915_gem_object *obj;
struct drm_mm_node *stolen;
int ret;
if (!drm_mm_initialized(&i915->mm.stolen))
return ERR_PTR(-ENODEV);
if (size == 0)
return ERR_PTR(-EINVAL);
stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
if (!stolen)
return ERR_PTR(-ENOMEM);
ret = i915_gem_stolen_insert_node(i915, stolen, size, 4096);
if (ret) {
obj = ERR_PTR(ret);
goto err_free;
}
obj = __i915_gem_object_create_stolen(mem, stolen);
if (IS_ERR(obj))
goto err_remove;
return obj;
err_remove:
i915_gem_stolen_remove_node(i915, stolen);
err_free:
kfree(stolen);
return obj;
}
struct drm_i915_gem_object *
i915_gem_object_create_stolen(struct drm_i915_private *i915,
resource_size_t size)
{
return i915_gem_object_create_region(i915->mm.regions[INTEL_REGION_STOLEN],
size, I915_BO_ALLOC_CONTIGUOUS);
}
static int init_stolen(struct intel_memory_region *mem)
{
intel_memory_region_set_name(mem, "stolen");
/*
* Initialise stolen early so that we may reserve preallocated
* objects for the BIOS to KMS transition.
*/
return i915_gem_init_stolen(mem->i915);
}
static void release_stolen(struct intel_memory_region *mem)
{
i915_gem_cleanup_stolen(mem->i915);
}
static const struct intel_memory_region_ops i915_region_stolen_ops = {
.init = init_stolen,
.release = release_stolen,
.create_object = _i915_gem_object_create_stolen,
};
struct intel_memory_region *i915_gem_stolen_setup(struct drm_i915_private *i915)
{
return intel_memory_region_create(i915,
intel_graphics_stolen_res.start,
resource_size(&intel_graphics_stolen_res),
PAGE_SIZE, 0,
&i915_region_stolen_ops);
}
struct drm_i915_gem_object *
i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *i915,
resource_size_t stolen_offset,
resource_size_t size)
{
struct intel_memory_region *mem = i915->mm.regions[INTEL_REGION_STOLEN];
struct drm_i915_gem_object *obj;
struct drm_mm_node *stolen;
int ret;
if (!drm_mm_initialized(&i915->mm.stolen))
return ERR_PTR(-ENODEV);
drm_dbg(&i915->drm,
"creating preallocated stolen object: stolen_offset=%pa, size=%pa\n",
&stolen_offset, &size);
/* KISS and expect everything to be page-aligned */
if (GEM_WARN_ON(size == 0) ||
GEM_WARN_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE)) ||
GEM_WARN_ON(!IS_ALIGNED(stolen_offset, I915_GTT_MIN_ALIGNMENT)))
return ERR_PTR(-EINVAL);
stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
if (!stolen)
return ERR_PTR(-ENOMEM);
stolen->start = stolen_offset;
stolen->size = size;
mutex_lock(&i915->mm.stolen_lock);
ret = drm_mm_reserve_node(&i915->mm.stolen, stolen);
mutex_unlock(&i915->mm.stolen_lock);
if (ret) {
obj = ERR_PTR(ret);
goto err_free;
}
obj = __i915_gem_object_create_stolen(mem, stolen);
if (IS_ERR(obj))
goto err_stolen;
i915_gem_object_set_cache_coherency(obj, I915_CACHE_NONE);
return obj;
err_stolen:
i915_gem_stolen_remove_node(i915, stolen);
err_free:
kfree(stolen);
return obj;
}