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drm/i915: Remove pages_mutex and intel_gtt->vma_ops.set/clear_pages members, v3.

Browse source 
Big delta, but boils down to moving set_pages to i915_vma.c, and removing
the special handling, all callers use the defaults anyway. We only remap
in ggtt, so default case will fall through.

Because we still don't require locking in i915_vma_unpin(), handle this by
using xchg in get_pages(), as it's locked with obj->mutex, and cmpxchg in
unpin, which only fails if we race a against a new pin.

Changes since v1:
- aliasing gtt sets ZERO_SIZE_PTR, not -ENODEV, remove special case
  from __i915_vma_get_pages(). (Matt)
Changes since v2:
- Free correct old pages in __i915_vma_get_pages(). (Matt)
  Remove race of clearing vma->pages accidentally from put,
  free it but leave it set, as only get has the lock.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211216142749.1966107-4-maarten.lankhorst@linux.intel.com
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
This commit is contained in:
Maarten Lankhorst 2021-12-16 15:27:35 +01:00
parent e4e8062530
commit 0b4d1f0e93
11 changed files with 374 additions and 439 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/gpu/drm/i915/display/intel_dpt.c
View file

@ -221,8 +221,6 @@ intel_dpt_create(struct intel_framebuffer *fb)
vm->vma_ops.bind_vma = dpt_bind_vma;
vm->vma_ops.unbind_vma = dpt_unbind_vma;
vm->vma_ops.set_pages = ggtt_set_pages;
vm->vma_ops.clear_pages = clear_pages;
vm->pte_encode = gen8_ggtt_pte_encode;

15
drivers/gpu/drm/i915/gt/gen6_ppgtt.c
View file

@ -269,19 +269,6 @@ static void gen6_ppgtt_cleanup(struct i915_address_space *vm)
free_pd(&ppgtt->base.vm, ppgtt->base.pd);
}
static int pd_vma_set_pages(struct i915_vma *vma)
{
vma->pages = ERR_PTR(-ENODEV);
return 0;
}
static void pd_vma_clear_pages(struct i915_vma *vma)
{
GEM_BUG_ON(!vma->pages);
vma->pages = NULL;
}
static void pd_vma_bind(struct i915_address_space *vm,
struct i915_vm_pt_stash *stash,
struct i915_vma *vma,
@ -321,8 +308,6 @@ static void pd_vma_unbind(struct i915_address_space *vm, struct i915_vma *vma)
}
static const struct i915_vma_ops pd_vma_ops = {
.set_pages = pd_vma_set_pages,
.clear_pages = pd_vma_clear_pages,
.bind_vma = pd_vma_bind,
.unbind_vma = pd_vma_unbind,
};

348
drivers/gpu/drm/i915/gt/intel_ggtt.c
View file

@ -20,9 +20,6 @@
#include "intel_gtt.h"
#include "gen8_ppgtt.h"
static int
i915_get_ggtt_vma_pages(struct i915_vma *vma);
static void i915_ggtt_color_adjust(const struct drm_mm_node *node,
unsigned long color,
u64 *start,
@ -875,21 +872,6 @@ static int ggtt_probe_common(struct i915_ggtt *ggtt, u64 size)
return 0;
}
int ggtt_set_pages(struct i915_vma *vma)
{
int ret;
GEM_BUG_ON(vma->pages);
ret = i915_get_ggtt_vma_pages(vma);
if (ret)
return ret;
vma->page_sizes = vma->obj->mm.page_sizes;
return 0;
}
static void gen6_gmch_remove(struct i915_address_space *vm)
{
struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
@ -951,8 +933,6 @@ static int gen8_gmch_probe(struct i915_ggtt *ggtt)
ggtt->vm.vma_ops.bind_vma = ggtt_bind_vma;
ggtt->vm.vma_ops.unbind_vma = ggtt_unbind_vma;
ggtt->vm.vma_ops.set_pages = ggtt_set_pages;
ggtt->vm.vma_ops.clear_pages = clear_pages;
ggtt->vm.pte_encode = gen8_ggtt_pte_encode;
@ -1102,8 +1082,6 @@ static int gen6_gmch_probe(struct i915_ggtt *ggtt)
ggtt->vm.vma_ops.bind_vma = ggtt_bind_vma;
ggtt->vm.vma_ops.unbind_vma = ggtt_unbind_vma;
ggtt->vm.vma_ops.set_pages = ggtt_set_pages;
ggtt->vm.vma_ops.clear_pages = clear_pages;
return ggtt_probe_common(ggtt, size);
}
@ -1148,8 +1126,6 @@ static int i915_gmch_probe(struct i915_ggtt *ggtt)
ggtt->vm.vma_ops.bind_vma = ggtt_bind_vma;
ggtt->vm.vma_ops.unbind_vma = ggtt_unbind_vma;
ggtt->vm.vma_ops.set_pages = ggtt_set_pages;
ggtt->vm.vma_ops.clear_pages = clear_pages;
if (unlikely(ggtt->do_idle_maps))
drm_notice(&i915->drm,
@ -1297,327 +1273,3 @@ void i915_ggtt_resume(struct i915_ggtt *ggtt)
intel_ggtt_restore_fences(ggtt);
}
static struct scatterlist *
rotate_pages(struct drm_i915_gem_object *obj, unsigned int offset,
unsigned int width, unsigned int height,
unsigned int src_stride, unsigned int dst_stride,
struct sg_table *st, struct scatterlist *sg)
{
unsigned int column, row;
unsigned int src_idx;
for (column = 0; column < width; column++) {
unsigned int left;
src_idx = src_stride * (height - 1) + column + offset;
for (row = 0; row < height; row++) {
st->nents++;
/*
* We don't need the pages, but need to initialize
* the entries so the sg list can be happily traversed.
* The only thing we need are DMA addresses.
*/
sg_set_page(sg, NULL, I915_GTT_PAGE_SIZE, 0);
sg_dma_address(sg) =
i915_gem_object_get_dma_address(obj, src_idx);
sg_dma_len(sg) = I915_GTT_PAGE_SIZE;
sg = sg_next(sg);
src_idx -= src_stride;
}
left = (dst_stride - height) * I915_GTT_PAGE_SIZE;
if (!left)
continue;
st->nents++;
/*
* The DE ignores the PTEs for the padding tiles, the sg entry
* here is just a conenience to indicate how many padding PTEs
* to insert at this spot.
*/
sg_set_page(sg, NULL, left, 0);
sg_dma_address(sg) = 0;
sg_dma_len(sg) = left;
sg = sg_next(sg);
}
return sg;
}
static noinline struct sg_table *
intel_rotate_pages(struct intel_rotation_info *rot_info,
struct drm_i915_gem_object *obj)
{
unsigned int size = intel_rotation_info_size(rot_info);
struct drm_i915_private *i915 = to_i915(obj->base.dev);
struct sg_table *st;
struct scatterlist *sg;
int ret = -ENOMEM;
int i;
/* Allocate target SG list. */
st = kmalloc(sizeof(*st), GFP_KERNEL);
if (!st)
goto err_st_alloc;
ret = sg_alloc_table(st, size, GFP_KERNEL);
if (ret)
goto err_sg_alloc;
st->nents = 0;
sg = st->sgl;
for (i = 0 ; i < ARRAY_SIZE(rot_info->plane); i++)
sg = rotate_pages(obj, rot_info->plane[i].offset,
rot_info->plane[i].width, rot_info->plane[i].height,
rot_info->plane[i].src_stride,
rot_info->plane[i].dst_stride,
st, sg);
return st;
err_sg_alloc:
kfree(st);
err_st_alloc:
drm_dbg(&i915->drm, "Failed to create rotated mapping for object size %zu! (%ux%u tiles, %u pages)\n",
obj->base.size, rot_info->plane[0].width,
rot_info->plane[0].height, size);
return ERR_PTR(ret);
}
static struct scatterlist *
remap_pages(struct drm_i915_gem_object *obj,
unsigned int offset, unsigned int alignment_pad,
unsigned int width, unsigned int height,
unsigned int src_stride, unsigned int dst_stride,
struct sg_table *st, struct scatterlist *sg)
{
unsigned int row;
if (!width || !height)
return sg;
if (alignment_pad) {
st->nents++;
/*
* The DE ignores the PTEs for the padding tiles, the sg entry
* here is just a convenience to indicate how many padding PTEs
* to insert at this spot.
*/
sg_set_page(sg, NULL, alignment_pad * 4096, 0);
sg_dma_address(sg) = 0;
sg_dma_len(sg) = alignment_pad * 4096;
sg = sg_next(sg);
}
for (row = 0; row < height; row++) {
unsigned int left = width * I915_GTT_PAGE_SIZE;
while (left) {
dma_addr_t addr;
unsigned int length;
/*
* We don't need the pages, but need to initialize
* the entries so the sg list can be happily traversed.
* The only thing we need are DMA addresses.
*/
addr = i915_gem_object_get_dma_address_len(obj, offset, &length);
length = min(left, length);
st->nents++;
sg_set_page(sg, NULL, length, 0);
sg_dma_address(sg) = addr;
sg_dma_len(sg) = length;
sg = sg_next(sg);
offset += length / I915_GTT_PAGE_SIZE;
left -= length;
}
offset += src_stride - width;
left = (dst_stride - width) * I915_GTT_PAGE_SIZE;
if (!left)
continue;
st->nents++;
/*
* The DE ignores the PTEs for the padding tiles, the sg entry
* here is just a conenience to indicate how many padding PTEs
* to insert at this spot.
*/
sg_set_page(sg, NULL, left, 0);
sg_dma_address(sg) = 0;
sg_dma_len(sg) = left;
sg = sg_next(sg);
}
return sg;
}
static noinline struct sg_table *
intel_remap_pages(struct intel_remapped_info *rem_info,
struct drm_i915_gem_object *obj)
{
unsigned int size = intel_remapped_info_size(rem_info);
struct drm_i915_private *i915 = to_i915(obj->base.dev);
struct sg_table *st;
struct scatterlist *sg;
unsigned int gtt_offset = 0;
int ret = -ENOMEM;
int i;
/* Allocate target SG list. */
st = kmalloc(sizeof(*st), GFP_KERNEL);
if (!st)
goto err_st_alloc;
ret = sg_alloc_table(st, size, GFP_KERNEL);
if (ret)
goto err_sg_alloc;
st->nents = 0;
sg = st->sgl;
for (i = 0 ; i < ARRAY_SIZE(rem_info->plane); i++) {
unsigned int alignment_pad = 0;
if (rem_info->plane_alignment)
alignment_pad = ALIGN(gtt_offset, rem_info->plane_alignment) - gtt_offset;
sg = remap_pages(obj,
rem_info->plane[i].offset, alignment_pad,
rem_info->plane[i].width, rem_info->plane[i].height,
rem_info->plane[i].src_stride, rem_info->plane[i].dst_stride,
st, sg);
gtt_offset += alignment_pad +
rem_info->plane[i].dst_stride * rem_info->plane[i].height;
}
i915_sg_trim(st);
return st;
err_sg_alloc:
kfree(st);
err_st_alloc:
drm_dbg(&i915->drm, "Failed to create remapped mapping for object size %zu! (%ux%u tiles, %u pages)\n",
obj->base.size, rem_info->plane[0].width,
rem_info->plane[0].height, size);
return ERR_PTR(ret);
}
static noinline struct sg_table *
intel_partial_pages(const struct i915_ggtt_view *view,
struct drm_i915_gem_object *obj)
{
struct sg_table *st;
struct scatterlist *sg, *iter;
unsigned int count = view->partial.size;
unsigned int offset;
int ret = -ENOMEM;
st = kmalloc(sizeof(*st), GFP_KERNEL);
if (!st)
goto err_st_alloc;
ret = sg_alloc_table(st, count, GFP_KERNEL);
if (ret)
goto err_sg_alloc;
iter = i915_gem_object_get_sg_dma(obj, view->partial.offset, &offset);
GEM_BUG_ON(!iter);
sg = st->sgl;
st->nents = 0;
do {
unsigned int len;
len = min(sg_dma_len(iter) - (offset << PAGE_SHIFT),
count << PAGE_SHIFT);
sg_set_page(sg, NULL, len, 0);
sg_dma_address(sg) =
sg_dma_address(iter) + (offset << PAGE_SHIFT);
sg_dma_len(sg) = len;
st->nents++;
count -= len >> PAGE_SHIFT;
if (count == 0) {
sg_mark_end(sg);
i915_sg_trim(st); /* Drop any unused tail entries. */
return st;
}
sg = __sg_next(sg);
iter = __sg_next(iter);
offset = 0;
} while (1);
err_sg_alloc:
kfree(st);
err_st_alloc:
return ERR_PTR(ret);
}
static int
i915_get_ggtt_vma_pages(struct i915_vma *vma)
{
int ret;
/*
* The vma->pages are only valid within the lifespan of the borrowed
* obj->mm.pages. When the obj->mm.pages sg_table is regenerated, so
* must be the vma->pages. A simple rule is that vma->pages must only
* be accessed when the obj->mm.pages are pinned.
*/
GEM_BUG_ON(!i915_gem_object_has_pinned_pages(vma->obj));
switch (vma->ggtt_view.type) {
default:
GEM_BUG_ON(vma->ggtt_view.type);
fallthrough;
case I915_GGTT_VIEW_NORMAL:
vma->pages = vma->obj->mm.pages;
return 0;
case I915_GGTT_VIEW_ROTATED:
vma->pages =
intel_rotate_pages(&vma->ggtt_view.rotated, vma->obj);
break;
case I915_GGTT_VIEW_REMAPPED:
vma->pages =
intel_remap_pages(&vma->ggtt_view.remapped, vma->obj);
break;
case I915_GGTT_VIEW_PARTIAL:
vma->pages = intel_partial_pages(&vma->ggtt_view, vma->obj);
break;
}
ret = 0;
if (IS_ERR(vma->pages)) {
ret = PTR_ERR(vma->pages);
vma->pages = NULL;
drm_err(&vma->vm->i915->drm,
"Failed to get pages for VMA view type %u (%d)!\n",
vma->ggtt_view.type, ret);
}
return ret;
}

13
drivers/gpu/drm/i915/gt/intel_gtt.c
View file

@ -223,19 +223,6 @@ void i915_address_space_init(struct i915_address_space *vm, int subclass)
INIT_LIST_HEAD(&vm->bound_list);
}
void clear_pages(struct i915_vma *vma)
{
GEM_BUG_ON(!vma->pages);
if (vma->pages != vma->obj->mm.pages) {
sg_free_table(vma->pages);
kfree(vma->pages);
}
vma->pages = NULL;
memset(&vma->page_sizes, 0, sizeof(vma->page_sizes));
}
void *__px_vaddr(struct drm_i915_gem_object *p)
{
enum i915_map_type type;

7
drivers/gpu/drm/i915/gt/intel_gtt.h
View file

@ -209,9 +209,6 @@ struct i915_vma_ops {
*/
void (*unbind_vma)(struct i915_address_space *vm,
struct i915_vma *vma);
int (*set_pages)(struct i915_vma *vma);
void (*clear_pages)(struct i915_vma *vma);
};
struct i915_address_space {
@ -599,10 +596,6 @@ release_pd_entry(struct i915_page_directory * const pd,
const struct drm_i915_gem_object * const scratch);
void gen6_ggtt_invalidate(struct i915_ggtt *ggtt);
int ggtt_set_pages(struct i915_vma *vma);
int ppgtt_set_pages(struct i915_vma *vma);
void clear_pages(struct i915_vma *vma);
void ppgtt_bind_vma(struct i915_address_space *vm,
struct i915_vm_pt_stash *stash,
struct i915_vma *vma,

12
drivers/gpu/drm/i915/gt/intel_ppgtt.c
View file

@ -289,16 +289,6 @@ void i915_vm_free_pt_stash(struct i915_address_space *vm,
}
}
int ppgtt_set_pages(struct i915_vma *vma)
{
GEM_BUG_ON(vma->pages);
vma->pages = vma->obj->mm.pages;
vma->page_sizes = vma->obj->mm.page_sizes;
return 0;
}
void ppgtt_init(struct i915_ppgtt *ppgtt, struct intel_gt *gt,
unsigned long lmem_pt_obj_flags)
{
@ -315,6 +305,4 @@ void ppgtt_init(struct i915_ppgtt *ppgtt, struct intel_gt *gt,
ppgtt->vm.vma_ops.bind_vma = ppgtt_bind_vma;
ppgtt->vm.vma_ops.unbind_vma = ppgtt_unbind_vma;
ppgtt->vm.vma_ops.set_pages = ppgtt_set_pages;
ppgtt->vm.vma_ops.clear_pages = clear_pages;
}

394
drivers/gpu/drm/i915/i915_vma.c
View file

@ -109,7 +109,6 @@ vma_create(struct drm_i915_gem_object *obj,
return ERR_PTR(-ENOMEM);
kref_init(&vma->ref);
mutex_init(&vma->pages_mutex);
vma->vm = i915_vm_get(vm);
vma->ops = &vm->vma_ops;
vma->obj = obj;
@ -415,7 +414,7 @@ int i915_vma_bind(struct i915_vma *vma,
if (bind_flags == 0)
return 0;
GEM_BUG_ON(!vma->pages);
GEM_BUG_ON(!atomic_read(&vma->pages_count));
trace_i915_vma_bind(vma, bind_flags);
if (work && bind_flags & vma->vm->bind_async_flags) {
@ -816,10 +815,337 @@ static bool try_qad_pin(struct i915_vma *vma, unsigned int flags)
return pinned;
}
static int vma_get_pages(struct i915_vma *vma)
static struct scatterlist *
rotate_pages(struct drm_i915_gem_object *obj, unsigned int offset,
unsigned int width, unsigned int height,
unsigned int src_stride, unsigned int dst_stride,
struct sg_table *st, struct scatterlist *sg)
{
int err = 0;
bool pinned_pages = true;
unsigned int column, row;
unsigned int src_idx;
for (column = 0; column < width; column++) {
unsigned int left;
src_idx = src_stride * (height - 1) + column + offset;
for (row = 0; row < height; row++) {
st->nents++;
/*
* We don't need the pages, but need to initialize
* the entries so the sg list can be happily traversed.
* The only thing we need are DMA addresses.
*/
sg_set_page(sg, NULL, I915_GTT_PAGE_SIZE, 0);
sg_dma_address(sg) =
i915_gem_object_get_dma_address(obj, src_idx);
sg_dma_len(sg) = I915_GTT_PAGE_SIZE;
sg = sg_next(sg);
src_idx -= src_stride;
}
left = (dst_stride - height) * I915_GTT_PAGE_SIZE;
if (!left)
continue;
st->nents++;
/*
* The DE ignores the PTEs for the padding tiles, the sg entry
* here is just a conenience to indicate how many padding PTEs
* to insert at this spot.
*/
sg_set_page(sg, NULL, left, 0);
sg_dma_address(sg) = 0;
sg_dma_len(sg) = left;
sg = sg_next(sg);
}
return sg;
}
static noinline struct sg_table *
intel_rotate_pages(struct intel_rotation_info *rot_info,
struct drm_i915_gem_object *obj)
{
unsigned int size = intel_rotation_info_size(rot_info);
struct drm_i915_private *i915 = to_i915(obj->base.dev);
struct sg_table *st;
struct scatterlist *sg;
int ret = -ENOMEM;
int i;
/* Allocate target SG list. */
st = kmalloc(sizeof(*st), GFP_KERNEL);
if (!st)
goto err_st_alloc;
ret = sg_alloc_table(st, size, GFP_KERNEL);
if (ret)
goto err_sg_alloc;
st->nents = 0;
sg = st->sgl;
for (i = 0 ; i < ARRAY_SIZE(rot_info->plane); i++)
sg = rotate_pages(obj, rot_info->plane[i].offset,
rot_info->plane[i].width, rot_info->plane[i].height,
rot_info->plane[i].src_stride,
rot_info->plane[i].dst_stride,
st, sg);
return st;
err_sg_alloc:
kfree(st);
err_st_alloc:
drm_dbg(&i915->drm, "Failed to create rotated mapping for object size %zu! (%ux%u tiles, %u pages)\n",
obj->base.size, rot_info->plane[0].width,
rot_info->plane[0].height, size);
return ERR_PTR(ret);
}
static struct scatterlist *
remap_pages(struct drm_i915_gem_object *obj,
unsigned int offset, unsigned int alignment_pad,
unsigned int width, unsigned int height,
unsigned int src_stride, unsigned int dst_stride,
struct sg_table *st, struct scatterlist *sg)
{
unsigned int row;
if (!width || !height)
return sg;
if (alignment_pad) {
st->nents++;
/*
* The DE ignores the PTEs for the padding tiles, the sg entry
* here is just a convenience to indicate how many padding PTEs
* to insert at this spot.
*/
sg_set_page(sg, NULL, alignment_pad * 4096, 0);
sg_dma_address(sg) = 0;
sg_dma_len(sg) = alignment_pad * 4096;
sg = sg_next(sg);
}
for (row = 0; row < height; row++) {
unsigned int left = width * I915_GTT_PAGE_SIZE;
while (left) {
dma_addr_t addr;
unsigned int length;
/*
* We don't need the pages, but need to initialize
* the entries so the sg list can be happily traversed.
* The only thing we need are DMA addresses.
*/
addr = i915_gem_object_get_dma_address_len(obj, offset, &length);
length = min(left, length);
st->nents++;
sg_set_page(sg, NULL, length, 0);
sg_dma_address(sg) = addr;
sg_dma_len(sg) = length;
sg = sg_next(sg);
offset += length / I915_GTT_PAGE_SIZE;
left -= length;
}
offset += src_stride - width;
left = (dst_stride - width) * I915_GTT_PAGE_SIZE;
if (!left)
continue;
st->nents++;
/*
* The DE ignores the PTEs for the padding tiles, the sg entry
* here is just a conenience to indicate how many padding PTEs
* to insert at this spot.
*/
sg_set_page(sg, NULL, left, 0);
sg_dma_address(sg) = 0;
sg_dma_len(sg) = left;
sg = sg_next(sg);
}
return sg;
}
static noinline struct sg_table *
intel_remap_pages(struct intel_remapped_info *rem_info,
struct drm_i915_gem_object *obj)
{
unsigned int size = intel_remapped_info_size(rem_info);
struct drm_i915_private *i915 = to_i915(obj->base.dev);
struct sg_table *st;
struct scatterlist *sg;
unsigned int gtt_offset = 0;
int ret = -ENOMEM;
int i;
/* Allocate target SG list. */
st = kmalloc(sizeof(*st), GFP_KERNEL);
if (!st)
goto err_st_alloc;
ret = sg_alloc_table(st, size, GFP_KERNEL);
if (ret)
goto err_sg_alloc;
st->nents = 0;
sg = st->sgl;
for (i = 0 ; i < ARRAY_SIZE(rem_info->plane); i++) {
unsigned int alignment_pad = 0;
if (rem_info->plane_alignment)
alignment_pad = ALIGN(gtt_offset, rem_info->plane_alignment) - gtt_offset;
sg = remap_pages(obj,
rem_info->plane[i].offset, alignment_pad,
rem_info->plane[i].width, rem_info->plane[i].height,
rem_info->plane[i].src_stride, rem_info->plane[i].dst_stride,
st, sg);
gtt_offset += alignment_pad +
rem_info->plane[i].dst_stride * rem_info->plane[i].height;
}
i915_sg_trim(st);
return st;
err_sg_alloc:
kfree(st);
err_st_alloc:
drm_dbg(&i915->drm, "Failed to create remapped mapping for object size %zu! (%ux%u tiles, %u pages)\n",
obj->base.size, rem_info->plane[0].width,
rem_info->plane[0].height, size);
return ERR_PTR(ret);
}
static noinline struct sg_table *
intel_partial_pages(const struct i915_ggtt_view *view,
struct drm_i915_gem_object *obj)
{
struct sg_table *st;
struct scatterlist *sg, *iter;
unsigned int count = view->partial.size;
unsigned int offset;
int ret = -ENOMEM;
st = kmalloc(sizeof(*st), GFP_KERNEL);
if (!st)
goto err_st_alloc;
ret = sg_alloc_table(st, count, GFP_KERNEL);
if (ret)
goto err_sg_alloc;
iter = i915_gem_object_get_sg_dma(obj, view->partial.offset, &offset);
GEM_BUG_ON(!iter);
sg = st->sgl;
st->nents = 0;
do {
unsigned int len;
len = min(sg_dma_len(iter) - (offset << PAGE_SHIFT),
count << PAGE_SHIFT);
sg_set_page(sg, NULL, len, 0);
sg_dma_address(sg) =
sg_dma_address(iter) + (offset << PAGE_SHIFT);
sg_dma_len(sg) = len;
st->nents++;
count -= len >> PAGE_SHIFT;
if (count == 0) {
sg_mark_end(sg);
i915_sg_trim(st); /* Drop any unused tail entries. */
return st;
}
sg = __sg_next(sg);
iter = __sg_next(iter);
offset = 0;
} while (1);
err_sg_alloc:
kfree(st);
err_st_alloc:
return ERR_PTR(ret);
}
static int
__i915_vma_get_pages(struct i915_vma *vma)
{
struct sg_table *pages;
int ret;
/*
* The vma->pages are only valid within the lifespan of the borrowed
* obj->mm.pages. When the obj->mm.pages sg_table is regenerated, so
* must be the vma->pages. A simple rule is that vma->pages must only
* be accessed when the obj->mm.pages are pinned.
*/
GEM_BUG_ON(!i915_gem_object_has_pinned_pages(vma->obj));
switch (vma->ggtt_view.type) {
default:
GEM_BUG_ON(vma->ggtt_view.type);
fallthrough;
case I915_GGTT_VIEW_NORMAL:
pages = vma->obj->mm.pages;
break;
case I915_GGTT_VIEW_ROTATED:
pages =
intel_rotate_pages(&vma->ggtt_view.rotated, vma->obj);
break;
case I915_GGTT_VIEW_REMAPPED:
pages =
intel_remap_pages(&vma->ggtt_view.remapped, vma->obj);
break;
case I915_GGTT_VIEW_PARTIAL:
pages = intel_partial_pages(&vma->ggtt_view, vma->obj);
break;
}
ret = 0;
if (IS_ERR(pages)) {
ret = PTR_ERR(pages);
pages = NULL;
drm_err(&vma->vm->i915->drm,
"Failed to get pages for VMA view type %u (%d)!\n",
vma->ggtt_view.type, ret);
}
vma->pages = pages;
return ret;
}
I915_SELFTEST_EXPORT int i915_vma_get_pages(struct i915_vma *vma)
{
int err;
if (atomic_add_unless(&vma->pages_count, 1, 0))
return 0;
@ -828,25 +1154,17 @@ static int vma_get_pages(struct i915_vma *vma)
if (err)
return err;
/* Allocations ahoy! */
if (mutex_lock_interruptible(&vma->pages_mutex)) {
err = -EINTR;
goto unpin;
}
err = __i915_vma_get_pages(vma);
if (err)
goto err_unpin;
if (!atomic_read(&vma->pages_count)) {
err = vma->ops->set_pages(vma);
if (err)
goto unlock;
pinned_pages = false;
}
vma->page_sizes = vma->obj->mm.page_sizes;
atomic_inc(&vma->pages_count);
unlock:
mutex_unlock(&vma->pages_mutex);
unpin:
if (pinned_pages)
__i915_gem_object_unpin_pages(vma->obj);
return 0;
err_unpin:
__i915_gem_object_unpin_pages(vma->obj);
return err;
}
@ -854,18 +1172,31 @@ static int vma_get_pages(struct i915_vma *vma)
static void __vma_put_pages(struct i915_vma *vma, unsigned int count)
{
/* We allocate under vma_get_pages, so beware the shrinker */
mutex_lock_nested(&vma->pages_mutex, SINGLE_DEPTH_NESTING);
struct sg_table *pages = READ_ONCE(vma->pages);
GEM_BUG_ON(atomic_read(&vma->pages_count) < count);
if (atomic_sub_return(count, &vma->pages_count) == 0) {
vma->ops->clear_pages(vma);
GEM_BUG_ON(vma->pages);
/*
* The atomic_sub_return is a read barrier for the READ_ONCE of
* vma->pages above.
*
* READ_ONCE is safe because this is either called from the same
* function (i915_vma_pin_ww), or guarded by vma->vm->mutex.
*
* TODO: We're leaving vma->pages dangling, until vma->obj->resv
* lock is required.
*/
if (pages != vma->obj->mm.pages) {
sg_free_table(pages);
kfree(pages);
}
i915_gem_object_unpin_pages(vma->obj);
}
mutex_unlock(&vma->pages_mutex);
}
static void vma_put_pages(struct i915_vma *vma)
I915_SELFTEST_EXPORT void i915_vma_put_pages(struct i915_vma *vma)
{
if (atomic_add_unless(&vma->pages_count, -1, 1))
return;
@ -896,10 +1227,8 @@ int i915_vma_pin_ww(struct i915_vma *vma, struct i915_gem_ww_ctx *ww,
unsigned int bound;
int err;
#ifdef CONFIG_PROVE_LOCKING
if (debug_locks && !WARN_ON(!ww))
assert_vma_held(vma);
#endif
assert_vma_held(vma);
GEM_BUG_ON(!ww);
BUILD_BUG_ON(PIN_GLOBAL != I915_VMA_GLOBAL_BIND);
BUILD_BUG_ON(PIN_USER != I915_VMA_LOCAL_BIND);
@ -910,7 +1239,7 @@ int i915_vma_pin_ww(struct i915_vma *vma, struct i915_gem_ww_ctx *ww,
if (try_qad_pin(vma, flags & I915_VMA_BIND_MASK))
return 0;
err = vma_get_pages(vma);
err = i915_vma_get_pages(vma);
if (err)
return err;
@ -1038,10 +1367,11 @@ int i915_vma_pin_ww(struct i915_vma *vma, struct i915_gem_ww_ctx *ww,
err_rpm:
if (wakeref)
intel_runtime_pm_put(&vma->vm->i915->runtime_pm, wakeref);
if (moving)
dma_fence_put(moving);
vma_put_pages(vma);
i915_vma_put_pages(vma);
return err;
}

3
drivers/gpu/drm/i915/i915_vma.h
View file

@ -431,4 +431,7 @@ static inline int i915_vma_sync(struct i915_vma *vma)
void i915_vma_module_exit(void);
int i915_vma_module_init(void);
I915_SELFTEST_DECLARE(int i915_vma_get_pages(struct i915_vma *vma));
I915_SELFTEST_DECLARE(void i915_vma_put_pages(struct i915_vma *vma));
#endif

1
drivers/gpu/drm/i915/i915_vma_types.h
View file

@ -261,7 +261,6 @@ struct i915_vma {
#define I915_VMA_PAGES_BIAS 24
#define I915_VMA_PAGES_ACTIVE (BIT(24) | 1)
atomic_t pages_count; /* number of active binds to the pages */
struct mutex pages_mutex; /* protect acquire/release of backing pages */
/**
* Support different GGTT views into the same object.

14
drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
View file

@ -1275,7 +1275,7 @@ static void track_vma_bind(struct i915_vma *vma)
__i915_gem_object_pin_pages(obj);
GEM_BUG_ON(vma->pages);
GEM_BUG_ON(atomic_read(&vma->pages_count));
atomic_set(&vma->pages_count, I915_VMA_PAGES_ACTIVE);
__i915_gem_object_pin_pages(obj);
vma->pages = obj->mm.pages;
@ -1953,7 +1953,9 @@ static int igt_cs_tlb(void *arg)
goto end;
}
err = vma->ops->set_pages(vma);
i915_gem_object_lock(bbe, NULL);
err = i915_vma_get_pages(vma);
i915_gem_object_unlock(bbe);
if (err)
goto end;
@ -1994,7 +1996,7 @@ static int igt_cs_tlb(void *arg)
i915_request_put(rq);
}
vma->ops->clear_pages(vma);
i915_vma_put_pages(vma);
err = context_sync(ce);
if (err) {
@ -2009,7 +2011,9 @@ static int igt_cs_tlb(void *arg)
goto end;
}
err = vma->ops->set_pages(vma);
i915_gem_object_lock(act, NULL);
err = i915_vma_get_pages(vma);
i915_gem_object_unlock(act);
if (err)
goto end;
@ -2047,7 +2051,7 @@ static int igt_cs_tlb(void *arg)
}
end_spin(batch, count - 1);
vma->ops->clear_pages(vma);
i915_vma_put_pages(vma);
err = context_sync(ce);
if (err) {

4
drivers/gpu/drm/i915/selftests/mock_gtt.c
View file

@ -87,8 +87,6 @@ struct i915_ppgtt *mock_ppgtt(struct drm_i915_private *i915, const char *name)
ppgtt->vm.vma_ops.bind_vma = mock_bind_ppgtt;
ppgtt->vm.vma_ops.unbind_vma = mock_unbind_ppgtt;
ppgtt->vm.vma_ops.set_pages = ppgtt_set_pages;
ppgtt->vm.vma_ops.clear_pages = clear_pages;
return ppgtt;
}
@ -128,8 +126,6 @@ void mock_init_ggtt(struct drm_i915_private *i915, struct i915_ggtt *ggtt)
ggtt->vm.vma_ops.bind_vma = mock_bind_ggtt;
ggtt->vm.vma_ops.unbind_vma = mock_unbind_ggtt;
ggtt->vm.vma_ops.set_pages = ggtt_set_pages;
ggtt->vm.vma_ops.clear_pages = clear_pages;
i915_address_space_init(&ggtt->vm, VM_CLASS_GGTT);
to_gt(i915)->ggtt = ggtt;