[Intel-gfx] [PATCH 13/28] drm/i915: Remove pages_mutex and intel_gtt->vma_ops.set/clear_pages members

Maarten Lankhorst
2021-10-21T10:36:59Z

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.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
drivers/gpu/drm/i915/display/intel_dpt.c | 2 -
drivers/gpu/drm/i915/gt/gen6_ppgtt.c | 15 -
drivers/gpu/drm/i915/gt/intel_ggtt.c | 345 ----------------
drivers/gpu/drm/i915/gt/intel_gtt.c | 13 -
drivers/gpu/drm/i915/gt/intel_gtt.h | 7 -
drivers/gpu/drm/i915/gt/intel_ppgtt.c | 12 -
drivers/gpu/drm/i915/i915_vma.c | 388 ++++++++++++++++--
drivers/gpu/drm/i915/i915_vma.h | 3 +
drivers/gpu/drm/i915/i915_vma_types.h | 1 -
drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 12 +-
drivers/gpu/drm/i915/selftests/mock_gtt.c | 4 -
11 files changed, 368 insertions(+), 434 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dpt.c b/drivers/gpu/drm/i915/display/intel_dpt.c
index 8f7b1f7534a4..ef428f3fc538 100644
--- a/drivers/gpu/drm/i915/display/intel_dpt.c
+++ b/drivers/gpu/drm/i915/display/intel_dpt.c
@@ -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;

diff --git a/drivers/gpu/drm/i915/gt/gen6_ppgtt.c b/drivers/gpu/drm/i915/gt/gen6_ppgtt.c
index 5caa1703716e..5c048b4ccd4d 100644
--- a/drivers/gpu/drm/i915/gt/gen6_ppgtt.c
+++ b/drivers/gpu/drm/i915/gt/gen6_ppgtt.c
@@ -270,19 +270,6 @@ 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,
@@ -322,8 +309,6 @@ 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,
};
diff --git a/drivers/gpu/drm/i915/gt/intel_ggtt.c b/drivers/gpu/drm/i915/gt/intel_ggtt.c
index f17383e76eb7..6da57199bb33 100644
--- a/drivers/gpu/drm/i915/gt/intel_ggtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_ggtt.c
@@ -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);
@@ -950,8 +932,6 @@ 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;

@@ -1100,8 +1080,6 @@ 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);
}
@@ -1145,8 +1123,6 @@ 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,
@@ -1294,324 +1270,3 @@ 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 (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;
-}
diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.c b/drivers/gpu/drm/i915/gt/intel_gtt.c
index 67d14afa6623..12eed5fcb17a 100644
--- a/drivers/gpu/drm/i915/gt/intel_gtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gtt.c
@@ -221,19 +221,6 @@ 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;
diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.h b/drivers/gpu/drm/i915/gt/intel_gtt.h
index bc6750263359..306e7645fdc5 100644
--- a/drivers/gpu/drm/i915/gt/intel_gtt.h
+++ b/drivers/gpu/drm/i915/gt/intel_gtt.h
@@ -206,9 +206,6 @@ 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 {
@@ -594,10 +591,6 @@ 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,
diff --git a/drivers/gpu/drm/i915/gt/intel_ppgtt.c b/drivers/gpu/drm/i915/gt/intel_ppgtt.c
index 4396bfd630d8..083b3090c69c 100644
--- a/drivers/gpu/drm/i915/gt/intel_ppgtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_ppgtt.c
@@ -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;
}
diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
index ac09b685678a..bacc8d68e495 100644
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -112,7 +112,6 @@ 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;
@@ -789,10 +788,343 @@ 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 (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;
+ /* gen6 ppgtt doesn't have backing pages, special-case it */
+ if (IS_ERR(pages) && pages != ERR_PTR(-ENODEV)) {
+ 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);
+ }
+
+ pages = xchg(&vma->pages, pages);
+
+ /* did we race against a put_pages? */
+ if (pages && pages != vma->obj->mm.pages) {
+ sg_free_table(vma->pages);
+ kfree(vma->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;
@@ -801,25 +1133,17 @@ 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;
}
@@ -827,18 +1151,22 @@ 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);
+ if (pages == cmpxchg(&vma->pages, pages, NULL) &&
+ 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;
@@ -868,10 +1196,8 @@ 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);
@@ -882,7 +1208,7 @@ 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;

@@ -1007,7 +1333,7 @@ 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);
- vma_put_pages(vma);
+ i915_vma_put_pages(vma);
return err;
}

diff --git a/drivers/gpu/drm/i915/i915_vma.h b/drivers/gpu/drm/i915/i915_vma.h
index 9a931ecb09e5..32719431b3df 100644
--- a/drivers/gpu/drm/i915/i915_vma.h
+++ b/drivers/gpu/drm/i915/i915_vma.h
@@ -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
diff --git a/drivers/gpu/drm/i915/i915_vma_types.h b/drivers/gpu/drm/i915/i915_vma_types.h
index 8a0decb19bcc..412d3e78a30d 100644
--- a/drivers/gpu/drm/i915/i915_vma_types.h
+++ b/drivers/gpu/drm/i915/i915_vma_types.h
@@ -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.
diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
index 46f4236039a9..4574fb51b656 100644
--- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
@@ -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) {
diff --git a/drivers/gpu/drm/i915/selftests/mock_gtt.c b/drivers/gpu/drm/i915/selftests/mock_gtt.c
index cc047ec594f9..096679014d99 100644
--- a/drivers/gpu/drm/i915/selftests/mock_gtt.c
+++ b/drivers/gpu/drm/i915/selftests/mock_gtt.c
@@ -86,8 +86,6 @@ 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;
}
@@ -126,8 +124,6 @@ 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);
i915->gt.ggtt = ggtt;
--
2.33.0