[PATCH v2 5/5] drm/i915: stolen memory use ttm backend

From: Robert Beckett
Date: Tue Apr 12 2022 - 11:19:22 EST

refactor stolen memory region to use ttm.
this necessitates using ttm resources to track reserved stolen regions
instead of drm_mm_nodes.

Signed-off-by: Robert Beckett <bob.beckett@xxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_fbc.c | 78 ++--
.../gpu/drm/i915/gem/i915_gem_object_types.h | 2 -
drivers/gpu/drm/i915/gem/i915_gem_stolen.c | 407 ++++++------------
drivers/gpu/drm/i915/gem/i915_gem_stolen.h | 21 +-
drivers/gpu/drm/i915/gem/i915_gem_ttm.h | 7 +
drivers/gpu/drm/i915/gt/intel_rc6.c | 4 +-
drivers/gpu/drm/i915/gt/selftest_reset.c | 16 +-
drivers/gpu/drm/i915/i915_debugfs.c | 7 +-
drivers/gpu/drm/i915/i915_drv.h | 5 -
drivers/gpu/drm/i915/intel_region_ttm.c | 36 +-
drivers/gpu/drm/i915/intel_region_ttm.h | 8 +-
drivers/gpu/drm/i915/selftests/mock_region.c | 3 +-
12 files changed, 241 insertions(+), 353 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c
index b653f3ba7c66..dbad1b6471b8 100644
--- a/drivers/gpu/drm/i915/display/intel_fbc.c
+++ b/drivers/gpu/drm/i915/display/intel_fbc.c
@@ -38,6 +38,7 @@
* forcibly disable it to allow proper screen updates.
*/

+#include "gem/i915_gem_stolen.h"
#include <linux/string_helpers.h>

#include <drm/drm_fourcc.h>
@@ -51,6 +52,7 @@
#include "intel_display_types.h"
#include "intel_fbc.h"
#include "intel_frontbuffer.h"
+#include "gem/i915_gem_region.h"

#define for_each_fbc_id(__dev_priv, __fbc_id) \
for ((__fbc_id) = INTEL_FBC_A; (__fbc_id) < I915_MAX_FBCS; (__fbc_id)++) \
@@ -93,8 +95,8 @@ struct intel_fbc {
unsigned int possible_framebuffer_bits;
unsigned int busy_bits;

- struct drm_mm_node compressed_fb;
- struct drm_mm_node compressed_llb;
+ struct ttm_resource *compressed_fb;
+ struct ttm_resource *compressed_llb;

enum intel_fbc_id id;

@@ -332,16 +334,20 @@ static void i8xx_fbc_nuke(struct intel_fbc *fbc)
static void i8xx_fbc_program_cfb(struct intel_fbc *fbc)
{
struct drm_i915_private *i915 = fbc->i915;
+ u64 fb_offset = i915_gem_stolen_reserve_offset(fbc->compressed_fb);
+ u64 llb_offset = i915_gem_stolen_reserve_offset(fbc->compressed_llb);

+ GEM_BUG_ON(fb_offset == I915_BO_INVALID_OFFSET);
+ GEM_BUG_ON(llb_offset == I915_BO_INVALID_OFFSET);
GEM_BUG_ON(range_overflows_end_t(u64, i915->dsm.start,
- fbc->compressed_fb.start, U32_MAX));
+ fb_offset, U32_MAX));
GEM_BUG_ON(range_overflows_end_t(u64, i915->dsm.start,
- fbc->compressed_llb.start, U32_MAX));
+ llb_offset, U32_MAX));

intel_de_write(i915, FBC_CFB_BASE,
- i915->dsm.start + fbc->compressed_fb.start);
+ i915->dsm.start + fb_offset);
intel_de_write(i915, FBC_LL_BASE,
- i915->dsm.start + fbc->compressed_llb.start);
+ i915->dsm.start + llb_offset);
}

static const struct intel_fbc_funcs i8xx_fbc_funcs = {
@@ -449,8 +455,10 @@ static bool g4x_fbc_is_compressing(struct intel_fbc *fbc)
static void g4x_fbc_program_cfb(struct intel_fbc *fbc)
{
struct drm_i915_private *i915 = fbc->i915;
+ u64 fb_offset = i915_gem_stolen_reserve_offset(fbc->compressed_fb);

- intel_de_write(i915, DPFC_CB_BASE, fbc->compressed_fb.start);
+ GEM_BUG_ON(fb_offset == I915_BO_INVALID_OFFSET);
+ intel_de_write(i915, DPFC_CB_BASE, fb_offset);
}

static const struct intel_fbc_funcs g4x_fbc_funcs = {
@@ -500,8 +508,10 @@ static bool ilk_fbc_is_compressing(struct intel_fbc *fbc)
static void ilk_fbc_program_cfb(struct intel_fbc *fbc)
{
struct drm_i915_private *i915 = fbc->i915;
+ u64 fb_offset = i915_gem_stolen_reserve_offset(fbc->compressed_fb);

- intel_de_write(i915, ILK_DPFC_CB_BASE(fbc->id), fbc->compressed_fb.start);
+ GEM_BUG_ON(fb_offset == I915_BO_INVALID_OFFSET);
+ intel_de_write(i915, ILK_DPFC_CB_BASE(fbc->id), fb_offset);
}

static const struct intel_fbc_funcs ilk_fbc_funcs = {
@@ -741,21 +751,24 @@ static int find_compression_limit(struct intel_fbc *fbc,
{
struct drm_i915_private *i915 = fbc->i915;
u64 end = intel_fbc_stolen_end(i915);
- int ret, limit = min_limit;
+ int limit = min_limit;
+ struct ttm_resource *res;

size /= limit;

/* Try to over-allocate to reduce reallocations and fragmentation. */
- ret = i915_gem_stolen_insert_node_in_range(i915, &fbc->compressed_fb,
- size <<= 1, 4096, 0, end);
- if (ret == 0)
+ res = i915_gem_stolen_reserve_range(i915, size <<= 1, 0, end);
+ if (!IS_ERR(res)) {
+ fbc->compressed_fb = res;
return limit;
+ }

for (; limit <= intel_fbc_max_limit(i915); limit <<= 1) {
- ret = i915_gem_stolen_insert_node_in_range(i915, &fbc->compressed_fb,
- size >>= 1, 4096, 0, end);
- if (ret == 0)
+ res = i915_gem_stolen_reserve_range(i915, size >>= 1, 0, end);
+ if (!IS_ERR(res)) {
+ fbc->compressed_fb = res;
return limit;
+ }
}

return 0;
@@ -766,17 +779,18 @@ static int intel_fbc_alloc_cfb(struct intel_fbc *fbc,
{
struct drm_i915_private *i915 = fbc->i915;
int ret;
+ struct ttm_resource *res;

- drm_WARN_ON(&i915->drm,
- drm_mm_node_allocated(&fbc->compressed_fb));
- drm_WARN_ON(&i915->drm,
- drm_mm_node_allocated(&fbc->compressed_llb));
+ drm_WARN_ON(&i915->drm, fbc->compressed_fb);
+ drm_WARN_ON(&i915->drm, fbc->compressed_llb);

if (DISPLAY_VER(i915) < 5 && !IS_G4X(i915)) {
- ret = i915_gem_stolen_insert_node(i915, &fbc->compressed_llb,
- 4096, 4096);
- if (ret)
+ res = i915_gem_stolen_reserve_range(i915, 4096, I915_GEM_STOLEN_BIAS, 0);
+ if (IS_ERR(res)) {
+ ret = PTR_ERR(res);
goto err;
+ }
+ fbc->compressed_llb = res;
}

ret = find_compression_limit(fbc, size, min_limit);
@@ -790,15 +804,14 @@ static int intel_fbc_alloc_cfb(struct intel_fbc *fbc,

drm_dbg_kms(&i915->drm,
"reserved %llu bytes of contiguous stolen space for FBC, limit: %d\n",
- fbc->compressed_fb.size, fbc->limit);
+ i915_gem_stolen_reserve_size(fbc->compressed_fb), fbc->limit);

return 0;

err_llb:
- if (drm_mm_node_allocated(&fbc->compressed_llb))
- i915_gem_stolen_remove_node(i915, &fbc->compressed_llb);
+ i915_gem_stolen_release_range(i915, fetch_and_zero(&fbc->compressed_llb));
err:
- if (drm_mm_initialized(&i915->mm.stolen))
+ if (IS_ERR(res) && (PTR_ERR(res) == -ENOMEM || PTR_ERR(res) == -ENXIO))
drm_info_once(&i915->drm, "not enough stolen space for compressed buffer (need %d more bytes), disabling. Hint: you may be able to increase stolen memory size in the BIOS to avoid this.\n", size);
return -ENOSPC;
}
@@ -815,10 +828,10 @@ static void __intel_fbc_cleanup_cfb(struct intel_fbc *fbc)
if (WARN_ON(intel_fbc_hw_is_active(fbc)))
return;

- if (drm_mm_node_allocated(&fbc->compressed_llb))
- i915_gem_stolen_remove_node(i915, &fbc->compressed_llb);
- if (drm_mm_node_allocated(&fbc->compressed_fb))
- i915_gem_stolen_remove_node(i915, &fbc->compressed_fb);
+ if (fbc->compressed_llb)
+ i915_gem_stolen_release_range(i915, fetch_and_zero(&fbc->compressed_llb));
+ if (fbc->compressed_fb)
+ i915_gem_stolen_release_range(i915, fetch_and_zero(&fbc->compressed_fb));
}

void intel_fbc_cleanup(struct drm_i915_private *i915)
@@ -1022,9 +1035,10 @@ static bool intel_fbc_is_cfb_ok(const struct intel_plane_state *plane_state)
{
struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
struct intel_fbc *fbc = plane->fbc;
+ u64 fb_size = i915_gem_stolen_reserve_size(fbc->compressed_fb);

return intel_fbc_min_limit(plane_state) <= fbc->limit &&
- intel_fbc_cfb_size(plane_state) <= fbc->compressed_fb.size * fbc->limit;
+ intel_fbc_cfb_size(plane_state) <= fb_size * fbc->limit;
}

static bool intel_fbc_is_ok(const struct intel_plane_state *plane_state)
@@ -1703,7 +1717,7 @@ void intel_fbc_init(struct drm_i915_private *i915)
{
enum intel_fbc_id fbc_id;

- if (!drm_mm_initialized(&i915->mm.stolen))
+ if (!i915->mm.stolen_region)
mkwrite_device_info(i915)->display.fbc_mask = 0;

if (need_fbc_vtd_wa(i915))
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
index 2c88bdb8ff7c..492600907e99 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
@@ -629,8 +629,6 @@ struct drm_i915_gem_object {
} userptr;
#endif

- struct drm_mm_node *stolen;
-
resource_size_t bo_offset;

unsigned long scratch;
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
index 47b5e0e342ab..2885c9e962f9 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
@@ -4,75 +4,101 @@
* Copyright © 2008-2012 Intel Corporation
*/

+#include "drm/ttm/ttm_placement.h"
+#include "gem/i915_gem_object_types.h"
#include <linux/errno.h>
#include <linux/mutex.h>

-#include <drm/drm_mm.h>
#include <drm/i915_drm.h>

#include "gem/i915_gem_lmem.h"
#include "gem/i915_gem_region.h"
#include "gt/intel_gt.h"
#include "gt/intel_region_lmem.h"
+#include "gem/i915_gem_ttm.h"
#include "i915_drv.h"
#include "i915_gem_stolen.h"
#include "i915_reg.h"
#include "i915_utils.h"
#include "i915_vgpu.h"
#include "intel_mchbar_regs.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.
+#include "intel_region_ttm.h"
+
+/**
+ * i915_gem_stolen_reserve_range - reserve a region of space in a given range
+ * @i915: i915 device instance
+ * @size: size of region to reserve
+ * @start: start of search area
+ * @end: end of search area
*
- * 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.
+ * Search for @size amount of free space within the region delimeted by @start and @end.
+ * If found reserve it from future use until later release with @i915_gem_stolen_release_range.
+ *
+ * Return: pointer to resource tracking structure on success, ERR_PTR otherwise
*/
-
-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)
+struct ttm_resource *
+i915_gem_stolen_reserve_range(struct drm_i915_private *i915,
+ resource_size_t size,
+ u64 start, u64 end)
{
- int ret;
+ struct intel_memory_region *mem = i915->mm.stolen_region;

- if (!drm_mm_initialized(&i915->mm.stolen))
- return -ENODEV;
-
- /* WaSkipStolenMemoryFirstPage:bdw+ */
- if (GRAPHICS_VER(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);
+ if (!mem)
+ return ERR_PTR(-ENODEV);
+ return intel_region_ttm_resource_alloc(mem, size, start, end, I915_BO_ALLOC_CONTIGUOUS);
+}

- return ret;
+/**
+ * i915_gem_stolen_reserve_offset - return the offset of the reserved space
+ * @res: pointer to resource tracking structure to check
+ *
+ * Return: The offset of the reserved resource, or I915_BO_INVALID_OFFSET on error
+ */
+u64 i915_gem_stolen_reserve_offset(struct ttm_resource *res)
+{
+ if (!res)
+ return I915_BO_INVALID_OFFSET;
+ return PFN_PHYS(res->start);
}

-int i915_gem_stolen_insert_node(struct drm_i915_private *i915,
- struct drm_mm_node *node, u64 size,
- unsigned alignment)
+/**
+ * i915_gem_stolen_reserve_size - return the reserved size of the reserved space
+ * @res: pointer to resource tracking structure to check
+ *
+ * Return: The size of the reserved resource, or I915_BO_INVALID_OFFSET on error
+ */
+u64 i915_gem_stolen_reserve_size(struct ttm_resource *res)
{
- return i915_gem_stolen_insert_node_in_range(i915, node,
- size, alignment,
- I915_GEM_STOLEN_BIAS,
- U64_MAX);
+ if (!res)
+ return I915_BO_INVALID_OFFSET;
+ return PFN_PHYS(res->num_pages);
}

-void i915_gem_stolen_remove_node(struct drm_i915_private *i915,
- struct drm_mm_node *node)
+/**
+ * i915_gem_stolen_release_range - release the reserved area to be free for allocation again
+ * @i915: i915 device instance
+ * @res: pointer to resource tracking structure allocated via @i915_gem_stolen_reserve_range
+ */
+void i915_gem_stolen_release_range(struct drm_i915_private *i915,
+ struct ttm_resource *res)
{
- mutex_lock(&i915->mm.stolen_lock);
- drm_mm_remove_node(node);
- mutex_unlock(&i915->mm.stolen_lock);
+ struct intel_memory_region *mem = i915->mm.stolen_region;
+
+ intel_region_ttm_resource_free(mem, res);
}

+/*
+ * 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.
+ */
+
static int i915_adjust_stolen(struct drm_i915_private *i915,
struct resource *dsm)
{
@@ -173,14 +199,6 @@ static int i915_adjust_stolen(struct drm_i915_private *i915,
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,
@@ -395,8 +413,6 @@ static int i915_gem_init_stolen(struct intel_memory_region *mem)
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",
@@ -513,258 +529,56 @@ static int i915_gem_init_stolen(struct intel_memory_region *mem)
return 0;

/* Basic memrange allocator for stolen space. */
- drm_mm_init(&i915->mm.stolen, 0, i915->stolen_usable_size);
-
- return 0;
+ return intel_region_ttm_init(mem);
}

-static void dbg_poison(struct i915_ggtt *ggtt,
- dma_addr_t addr, resource_size_t size,
- u8 x)
-{
-#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)
- if (!drm_mm_node_allocated(&ggtt->error_capture))
- return;
-
- if (ggtt->vm.bind_async_flags & I915_VMA_GLOBAL_BIND)
- return; /* beware stop_machine() inversion */
-
- GEM_BUG_ON(!IS_ALIGNED(size, PAGE_SIZE));
-
- mutex_lock(&ggtt->error_mutex);
- while (size) {
- void __iomem *s;
-
- ggtt->vm.insert_page(&ggtt->vm, addr,
- ggtt->error_capture.start,
- I915_CACHE_NONE, 0);
- mb();
-
- s = io_mapping_map_wc(&ggtt->iomap,
- ggtt->error_capture.start,
- PAGE_SIZE);
- memset_io(s, x, PAGE_SIZE);
- io_mapping_unmap(s);
-
- addr += PAGE_SIZE;
- size -= PAGE_SIZE;
- }
- mb();
- ggtt->vm.clear_range(&ggtt->vm, ggtt->error_capture.start, PAGE_SIZE);
- mutex_unlock(&ggtt->error_mutex);
-#endif
-}
-
-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 drm_i915_private *i915 = to_i915(obj->base.dev);
- 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);
-
- dbg_poison(to_gt(i915)->ggtt,
- sg_dma_address(pages->sgl),
- sg_dma_len(pages->sgl),
- POISON_INUSE);
-
- __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)
-{
- struct drm_i915_private *i915 = to_i915(obj->base.dev);
- /* Should only be called from i915_gem_object_release_stolen() */
-
- dbg_poison(to_gt(i915)->ggtt,
- sg_dma_address(pages->sgl),
- sg_dma_len(pages->sgl),
- POISON_FREE);
-
- sg_free_table(pages);
- kfree(pages);
-}
-
-static void
-i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
+struct drm_i915_gem_object *
+i915_gem_object_create_stolen(struct drm_i915_private *i915,
+ resource_size_t size)
{
- 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_stolen_remove_node(i915, stolen);
- kfree(stolen);
-
- i915_gem_object_release_memory_region(obj);
+ return i915_gem_object_create_region(i915->mm.stolen_region, size, 0,
+ I915_BO_ALLOC_CONTIGUOUS);
}

-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 int __i915_gem_object_create_stolen(struct intel_memory_region *mem,
- struct drm_i915_gem_object *obj,
- struct drm_mm_node *stolen)
+static int init_stolen_smem(struct intel_memory_region *mem)
{
- static struct lock_class_key lock_class;
- unsigned int cache_level;
- unsigned int flags;
- int err;
-
/*
- * Stolen objects are always physically contiguous since we just
- * allocate one big block underneath using the drm_mm range allocator.
+ * Initialise stolen early so that we may reserve preallocated
+ * objects for the BIOS to KMS transition.
*/
- flags = I915_BO_ALLOC_CONTIGUOUS;
-
- drm_gem_private_object_init(&mem->i915->drm, &obj->base, stolen->size);
- i915_gem_object_init(obj, &i915_gem_object_stolen_ops, &lock_class, flags);
-
- 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);
-
- if (WARN_ON(!i915_gem_object_trylock(obj, NULL)))
- return -EBUSY;
-
- i915_gem_object_init_memory_region(obj, mem);
-
- err = i915_gem_object_pin_pages(obj);
- if (err)
- i915_gem_object_release_memory_region(obj);
- i915_gem_object_unlock(obj);
-
- return err;
+ return i915_gem_init_stolen(mem);
}

-static int _i915_gem_object_stolen_init(struct intel_memory_region *mem,
- struct drm_i915_gem_object *obj,
- resource_size_t offset,
- resource_size_t size,
- resource_size_t page_size,
- unsigned int flags)
+static int stolen_object_init(struct intel_memory_region *mem,
+ struct drm_i915_gem_object *obj,
+ resource_size_t offset,
+ resource_size_t size,
+ resource_size_t page_size,
+ unsigned int flags)
{
- struct drm_i915_private *i915 = mem->i915;
- struct drm_mm_node *stolen;
int ret;

- if (!drm_mm_initialized(&i915->mm.stolen))
+ if (!mem->region_private)
return -ENODEV;

if (size == 0)
return -EINVAL;

- /*
- * With discrete devices, where we lack a mappable aperture there is no
- * possible way to ever access this memory on the CPU side.
- */
- if (mem->type == INTEL_MEMORY_STOLEN_LOCAL && !mem->io_size &&
- !(flags & I915_BO_ALLOC_GPU_ONLY))
- return -ENOSPC;
-
- stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
- if (!stolen)
- return -ENOMEM;
-
- if (offset != I915_BO_INVALID_OFFSET) {
- drm_dbg(&i915->drm,
- "creating preallocated stolen object: stolen_offset=%pa, size=%pa\n",
- &offset, &size);
-
- stolen->start = 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);
- } else {
- ret = i915_gem_stolen_insert_node(i915, stolen, size,
- mem->min_page_size);
- }
+ ret = __i915_gem_ttm_object_init(mem, obj, offset, size, page_size, flags);
if (ret)
- goto err_free;
+ return ret;

- ret = __i915_gem_object_create_stolen(mem, obj, stolen);
+ ret = i915_gem_object_pin_pages_unlocked(obj);
if (ret)
- goto err_remove;
+ i915_gem_object_put(obj);

- return 0;
-
-err_remove:
- i915_gem_stolen_remove_node(i915, stolen);
-err_free:
- kfree(stolen);
return ret;
}

-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.stolen_region, size, 0, 0);
-}
-
-static int init_stolen_smem(struct intel_memory_region *mem)
-{
- /*
- * Initialise stolen early so that we may reserve preallocated
- * objects for the BIOS to KMS transition.
- */
- return i915_gem_init_stolen(mem);
-}
-
-static int release_stolen_smem(struct intel_memory_region *mem)
-{
- i915_gem_cleanup_stolen(mem->i915);
- return 0;
-}
-
static const struct intel_memory_region_ops i915_region_stolen_smem_ops = {
.init = init_stolen_smem,
- .release = release_stolen_smem,
- .init_object = _i915_gem_object_stolen_init,
+ .release = intel_region_ttm_fini,
+ .init_object = stolen_object_init,
};

static int init_stolen_lmem(struct intel_memory_region *mem)
@@ -793,7 +607,7 @@ static int init_stolen_lmem(struct intel_memory_region *mem)
return 0;

err_cleanup:
- i915_gem_cleanup_stolen(mem->i915);
+ intel_region_ttm_fini(mem);
return err;
}

@@ -801,14 +615,13 @@ static int release_stolen_lmem(struct intel_memory_region *mem)
{
if (mem->io_size)
io_mapping_fini(&mem->iomap);
- i915_gem_cleanup_stolen(mem->i915);
- return 0;
+ return intel_region_ttm_fini(mem);
}

static const struct intel_memory_region_ops i915_region_stolen_lmem_ops = {
.init = init_stolen_lmem,
.release = release_stolen_lmem,
- .init_object = _i915_gem_object_stolen_init,
+ .init_object = __i915_gem_ttm_object_init,
};

struct intel_memory_region *
@@ -896,7 +709,37 @@ i915_gem_stolen_smem_setup(struct drm_i915_private *i915, u16 type,
return mem;
}

-bool i915_gem_object_is_stolen(const struct drm_i915_gem_object *obj)
+/**
+ * i915_gem_object_stolen_offset - return offset from start of stolen region
+ * @obj: the object to return the offset of
+ *
+ * Get the offset from stolen region if this object is currently placed in stolen memory.
+ *
+ * Return: offset from stolen if successful, I915_BO_INVALID_OFFSET otherwise
+ */
+u64 i915_gem_object_stolen_offset(struct drm_i915_gem_object *obj)
{
- return obj->ops == &i915_gem_object_stolen_ops;
+ struct ttm_buffer_object *ttm_obj;
+
+ if (!obj || !i915_gem_object_is_stolen(obj))
+ return I915_BO_INVALID_OFFSET;
+
+ ttm_obj = i915_gem_to_ttm(obj);
+ if (ttm_obj->resource->mem_type != I915_PL_STOLEN)
+ return I915_BO_INVALID_OFFSET;
+
+ return PFN_PHYS(ttm_obj->resource->start);
+}
+
+bool i915_gem_object_is_stolen(struct drm_i915_gem_object *obj)
+{
+ struct intel_memory_region *mr = READ_ONCE(obj->mm.region);
+
+#ifdef CONFIG_LOCKDEP
+ if (i915_gem_object_migratable(obj) &&
+ i915_gem_object_evictable(obj))
+ assert_object_held(obj);
+#endif
+ return mr && (mr->type == INTEL_MEMORY_STOLEN_SYSTEM ||
+ mr->type == INTEL_MEMORY_STOLEN_LOCAL);
}
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_stolen.h b/drivers/gpu/drm/i915/gem/i915_gem_stolen.h
index d5005a39d130..b39cb6e6c768 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_stolen.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_stolen.h
@@ -10,17 +10,9 @@

struct drm_i915_private;
struct drm_mm_node;
+struct ttm_resource;
struct drm_i915_gem_object;

-int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv,
- struct drm_mm_node *node, u64 size,
- unsigned alignment);
-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);
-void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv,
- struct drm_mm_node *node);
struct intel_memory_region *
i915_gem_stolen_smem_setup(struct drm_i915_private *i915, u16 type,
u16 instance);
@@ -32,7 +24,16 @@ struct drm_i915_gem_object *
i915_gem_object_create_stolen(struct drm_i915_private *dev_priv,
resource_size_t size);

-bool i915_gem_object_is_stolen(const struct drm_i915_gem_object *obj);
+u64 i915_gem_object_stolen_offset(struct drm_i915_gem_object *obj);
+bool i915_gem_object_is_stolen(struct drm_i915_gem_object *obj);
+struct ttm_resource *
+i915_gem_stolen_reserve_range(struct drm_i915_private *i915,
+ resource_size_t size,
+ u64 start, u64 end);
+u64 i915_gem_stolen_reserve_offset(struct ttm_resource *res);
+u64 i915_gem_stolen_reserve_size(struct ttm_resource *res);
+void i915_gem_stolen_release_range(struct drm_i915_private *i915,
+ struct ttm_resource *res);

#define I915_GEM_STOLEN_BIAS SZ_128K

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.h b/drivers/gpu/drm/i915/gem/i915_gem_ttm.h
index 73e371aa3850..81654a51df51 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.h
@@ -49,6 +49,13 @@ int __i915_gem_ttm_object_init(struct intel_memory_region *mem,
resource_size_t size,
resource_size_t page_size,
unsigned int flags);
+int i915_gem_ttm_object_init_in_place(struct intel_memory_region *mem,
+ struct drm_i915_gem_object *obj,
+ resource_size_t size,
+ resource_size_t page_size,
+ unsigned int flags,
+ u64 start,
+ u64 end);

/* Internal I915 TTM declarations and definitions below. */

diff --git a/drivers/gpu/drm/i915/gt/intel_rc6.c b/drivers/gpu/drm/i915/gt/intel_rc6.c
index b4770690e794..269b7f467fdf 100644
--- a/drivers/gpu/drm/i915/gt/intel_rc6.c
+++ b/drivers/gpu/drm/i915/gt/intel_rc6.c
@@ -355,9 +355,9 @@ static int vlv_rc6_init(struct intel_rc6 *rc6)

GEM_BUG_ON(range_overflows_end_t(u64,
i915->dsm.start,
- pctx->stolen->start,
+ i915_gem_object_stolen_offset(pctx),
U32_MAX));
- pctx_paddr = i915->dsm.start + pctx->stolen->start;
+ pctx_paddr = i915->dsm.start + i915_gem_object_stolen_offset(pctx);
intel_uncore_write(uncore, VLV_PCBR, pctx_paddr);

out:
diff --git a/drivers/gpu/drm/i915/gt/selftest_reset.c b/drivers/gpu/drm/i915/gt/selftest_reset.c
index 37c38bdd5f47..75bc7d90c9dc 100644
--- a/drivers/gpu/drm/i915/gt/selftest_reset.c
+++ b/drivers/gpu/drm/i915/gt/selftest_reset.c
@@ -6,6 +6,7 @@
#include <linux/crc32.h>

#include "gem/i915_gem_stolen.h"
+#include "intel_region_ttm.h"

#include "i915_memcpy.h"
#include "i915_selftest.h"
@@ -83,6 +84,7 @@ __igt_reset_stolen(struct intel_gt *gt,
dma_addr_t dma = (dma_addr_t)dsm->start + (page << PAGE_SHIFT);
void __iomem *s;
void *in;
+ bool busy;

ggtt->vm.insert_page(&ggtt->vm, dma,
ggtt->error_capture.start,
@@ -93,9 +95,9 @@ __igt_reset_stolen(struct intel_gt *gt,
ggtt->error_capture.start,
PAGE_SIZE);

- if (!__drm_mm_interval_first(&gt->i915->mm.stolen,
- page << PAGE_SHIFT,
- ((page + 1) << PAGE_SHIFT) - 1))
+ busy = intel_region_ttm_range_busy(gt->i915->mm.stolen_region,
+ PFN_PHYS(page), PAGE_SIZE);
+ if (!busy)
memset_io(s, STACK_MAGIC, PAGE_SIZE);

in = (void __force *)s;
@@ -124,6 +126,7 @@ __igt_reset_stolen(struct intel_gt *gt,
void __iomem *s;
void *in;
u32 x;
+ bool busy;

ggtt->vm.insert_page(&ggtt->vm, dma,
ggtt->error_capture.start,
@@ -139,10 +142,9 @@ __igt_reset_stolen(struct intel_gt *gt,
in = tmp;
x = crc32_le(0, in, PAGE_SIZE);

- if (x != crc[page] &&
- !__drm_mm_interval_first(&gt->i915->mm.stolen,
- page << PAGE_SHIFT,
- ((page + 1) << PAGE_SHIFT) - 1)) {
+ busy = intel_region_ttm_range_busy(gt->i915->mm.stolen_region,
+ PFN_PHYS(page), PAGE_SIZE);
+ if (x != crc[page] && !busy) {
pr_debug("unused stolen page %pa modified by GPU reset\n",
&page);
if (count++ == 0)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 94e5c29d2ee3..e538b8f71dcc 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -32,6 +32,7 @@

#include <drm/drm_debugfs.h>

+#include "gem/i915_gem_region.h"
#include "gem/i915_gem_context.h"
#include "gt/intel_gt.h"
#include "gt/intel_gt_buffer_pool.h"
@@ -157,6 +158,7 @@ i915_debugfs_describe_obj(struct seq_file *m, struct drm_i915_gem_object *obj)
struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
struct i915_vma *vma;
int pin_count = 0;
+ u64 offset;

seq_printf(m, "%pK: %c%c%c %8zdKiB %02x %02x %s%s%s",
&obj->base,
@@ -241,8 +243,9 @@ i915_debugfs_describe_obj(struct seq_file *m, struct drm_i915_gem_object *obj)
spin_unlock(&obj->vma.lock);

seq_printf(m, " (pinned x %d)", pin_count);
- if (i915_gem_object_is_stolen(obj))
- seq_printf(m, " (stolen: %08llx)", obj->stolen->start);
+ offset = i915_gem_object_stolen_offset(obj);
+ if (offset != I915_BO_INVALID_OFFSET)
+ seq_printf(m, " (stolen: %08llx)", offset);
if (i915_gem_object_is_framebuffer(obj))
seq_printf(m, " (fb)");
}
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 06e7c2802c5e..d05cf2fc3ef6 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -231,11 +231,6 @@ struct i915_gem_mm {
* support stolen.
*/
struct intel_memory_region *stolen_region;
- /** Memory allocator for GTT stolen memory */
- struct drm_mm stolen;
- /** Protects the usage of the GTT stolen memory allocator. This is
- * always the inner lock when overlapping with struct_mutex. */
- struct mutex stolen_lock;

/* Protects bound_list/unbound_list and #drm_i915_gem_object.mm.link */
spinlock_t obj_lock;
diff --git a/drivers/gpu/drm/i915/intel_region_ttm.c b/drivers/gpu/drm/i915/intel_region_ttm.c
index 7d49ea72e33f..4450b4897d59 100644
--- a/drivers/gpu/drm/i915/intel_region_ttm.c
+++ b/drivers/gpu/drm/i915/intel_region_ttm.c
@@ -189,11 +189,12 @@ intel_region_ttm_resource_to_rsgt(struct intel_memory_region *mem,
}
}

-#ifdef CONFIG_DRM_I915_SELFTEST
/**
* intel_region_ttm_resource_alloc - Allocate memory resources from a region
* @mem: The memory region,
* @size: The requested size in bytes
+ * @start: start of allowed range
+ * @end: end of allowed range
* @flags: Allocation flags
*
* This functionality is provided only for callers that need to allocate
@@ -207,8 +208,9 @@ intel_region_ttm_resource_to_rsgt(struct intel_memory_region *mem,
*/
struct ttm_resource *
intel_region_ttm_resource_alloc(struct intel_memory_region *mem,
- resource_size_t offset,
resource_size_t size,
+ u64 start,
+ u64 end,
unsigned int flags)
{
struct ttm_resource_manager *man = mem->region_private;
@@ -219,9 +221,9 @@ intel_region_ttm_resource_alloc(struct intel_memory_region *mem,

if (flags & I915_BO_ALLOC_CONTIGUOUS)
place.flags |= TTM_PL_FLAG_CONTIGUOUS;
- if (offset != I915_BO_INVALID_OFFSET) {
- place.fpfn = offset >> PAGE_SHIFT;
- place.lpfn = place.fpfn + (size >> PAGE_SHIFT);
+ if (start || end) {
+ place.fpfn = PFN_DOWN(start);
+ place.lpfn = PFN_UP(end);
} else if (mem->io_size && mem->io_size < mem->total) {
if (flags & I915_BO_ALLOC_GPU_ONLY) {
place.flags |= TTM_PL_FLAG_TOPDOWN;
@@ -242,8 +244,6 @@ intel_region_ttm_resource_alloc(struct intel_memory_region *mem,
return ret ? ERR_PTR(ret) : res;
}

-#endif
-
/**
* intel_region_ttm_resource_free - Free a resource allocated from a resource manager
* @mem: The region the resource was allocated from.
@@ -261,3 +261,25 @@ void intel_region_ttm_resource_free(struct intel_memory_region *mem,

man->func->free(man, res);
}
+
+/**
+ * intel_region_ttm_range_busy - check whether range has any allocations
+ * @mem: The region to check
+ * @start: the start of the range to check
+ * @size: size of the range to check
+ *
+ * Return: true if something is alloceted within the region, false otherwise.
+ */
+bool intel_region_ttm_range_busy(struct intel_memory_region *mem,
+ u64 start, u64 size)
+{
+ struct ttm_resource *dummy;
+
+ dummy = intel_region_ttm_resource_alloc(mem, size, start, start + size,
+ I915_BO_ALLOC_CONTIGUOUS);
+ if (IS_ERR(dummy))
+ return true;
+
+ intel_region_ttm_resource_free(mem, dummy);
+ return false;
+}
diff --git a/drivers/gpu/drm/i915/intel_region_ttm.h b/drivers/gpu/drm/i915/intel_region_ttm.h
index cf9d86dcf409..1e88472fb2ea 100644
--- a/drivers/gpu/drm/i915/intel_region_ttm.h
+++ b/drivers/gpu/drm/i915/intel_region_ttm.h
@@ -29,15 +29,17 @@ intel_region_ttm_resource_to_rsgt(struct intel_memory_region *mem,
void intel_region_ttm_resource_free(struct intel_memory_region *mem,
struct ttm_resource *res);

+bool intel_region_ttm_range_busy(struct intel_memory_region *mem,
+ u64 start, u64 size);
+
int intel_region_to_ttm_type(const struct intel_memory_region *mem);

struct ttm_device_funcs *i915_ttm_driver(void);

-#ifdef CONFIG_DRM_I915_SELFTEST
struct ttm_resource *
intel_region_ttm_resource_alloc(struct intel_memory_region *mem,
- resource_size_t offset,
resource_size_t size,
+ u64 start,
+ u64 end,
unsigned int flags);
-#endif
#endif /* _INTEL_REGION_TTM_H_ */
diff --git a/drivers/gpu/drm/i915/selftests/mock_region.c b/drivers/gpu/drm/i915/selftests/mock_region.c
index 670557ce1024..15be2440cdb8 100644
--- a/drivers/gpu/drm/i915/selftests/mock_region.c
+++ b/drivers/gpu/drm/i915/selftests/mock_region.c
@@ -26,8 +26,9 @@ static int mock_region_get_pages(struct drm_i915_gem_object *obj)
int err;

obj->mm.res = intel_region_ttm_resource_alloc(obj->mm.region,
- obj->bo_offset,
obj->base.size,
+ obj->bo_offset,
+ obj->bo_offset + obj->base.size,
obj->flags);
if (IS_ERR(obj->mm.res))
return PTR_ERR(obj->mm.res);
--
2.25.1