From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
To overcome display engine stride limits we'll want to remap the
pages in the GTT. To that end we need a new gtt_view type which
is just like the "rotated" type except not rotated.
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_debugfs.c | 12 +++++
drivers/gpu/drm/i915/i915_gem_gtt.c | 91 ++++++++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/i915_gem_gtt.h | 16 +++++++
drivers/gpu/drm/i915/i915_vma.c | 6 ++-
drivers/gpu/drm/i915/i915_vma.h | 5 +-
drivers/gpu/drm/i915/intel_display.c | 11 +++++
drivers/gpu/drm/i915/intel_drv.h | 1 +
7 files changed, 140 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index b3aefd623557..82b2984eabee 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -196,6 +196,18 @@ describe_obj(struct seq_file *m, struct drm_i915_gem_object *obj)
vma->ggtt_view.rotated.plane[1].offset);
break;
+ case I915_GGTT_VIEW_REMAPPED:
+ seq_printf(m, ", remapped [(%ux%u, stride=%u, offset=%u), (%ux%u, stride=%u, offset=%u)]",
+ vma->ggtt_view.remapped.plane[0].width,
+ vma->ggtt_view.remapped.plane[0].height,
+ vma->ggtt_view.remapped.plane[0].stride,
+ vma->ggtt_view.remapped.plane[0].offset,
+ vma->ggtt_view.remapped.plane[1].width,
+ vma->ggtt_view.remapped.plane[1].height,
+ vma->ggtt_view.remapped.plane[1].stride,
+ vma->ggtt_view.remapped.plane[1].offset);
+ break;
+
default:
MISSING_CASE(vma->ggtt_view.type);
break;
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index f00c7fbef79e..29b16f564225 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -3800,6 +3800,92 @@ intel_rotate_pages(struct intel_rotation_info *rot_info,
return ERR_PTR(ret);
}
+static struct scatterlist *
+remap_pages(const dma_addr_t *in, unsigned int offset,
+ unsigned int width, unsigned int height,
+ unsigned int stride,
+ struct sg_table *st, struct scatterlist *sg)
+{
+ unsigned int column, row;
+
+ for (row = 0; row < height; row++) {
+ for (column = 0; column < width; column++) {
+ 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, PAGE_SIZE, 0);
+ sg_dma_address(sg) = in[offset + column];
+ sg_dma_len(sg) = PAGE_SIZE;
+ sg = sg_next(sg);
+ }
+ offset += stride;
+ }
+
+ return sg;
+}
+
+static noinline struct sg_table *
+intel_remap_pages(struct intel_remapped_info *rem_info,
+ struct drm_i915_gem_object *obj)
+{
+ const unsigned long n_pages = obj->base.size / PAGE_SIZE;
+ unsigned int size = intel_remapped_info_size(rem_info);
+ struct sgt_iter sgt_iter;
+ dma_addr_t dma_addr;
+ unsigned long i;
+ dma_addr_t *page_addr_list;
+ struct sg_table *st;
+ struct scatterlist *sg;
+ int ret = -ENOMEM;
+
+ /* Allocate a temporary list of source pages for random access. */
+ page_addr_list = kvmalloc_array(n_pages,
+ sizeof(dma_addr_t),
+ GFP_KERNEL);
+ if (!page_addr_list)
+ return ERR_PTR(ret);
+
+ /* 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;
+
+ /* Populate source page list from the object. */
+ i = 0;
+ for_each_sgt_dma(dma_addr, sgt_iter, obj->mm.pages)
+ page_addr_list[i++] = dma_addr;
+
+ GEM_BUG_ON(i != n_pages);
+ st->nents = 0;
+ sg = st->sgl;
+
+ for (i = 0 ; i < ARRAY_SIZE(rem_info->plane); i++) {
+ sg = remap_pages(page_addr_list, rem_info->plane[i].offset,
+ rem_info->plane[i].width, rem_info->plane[i].height,
+ rem_info->plane[i].stride, st, sg);
+ }
+
+ kvfree(page_addr_list);
+
+ return st;
+
+err_sg_alloc:
+ kfree(st);
+err_st_alloc:
+ kvfree(page_addr_list);
+
+ DRM_DEBUG_DRIVER("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)
@@ -3876,6 +3962,11 @@ i915_get_ggtt_vma_pages(struct i915_vma *vma)
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;
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
index 2a116a91420b..e15ac9f64c36 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.h
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
@@ -160,6 +160,19 @@ typedef u64 gen8_ppgtt_pml4e_t;
struct sg_table;
+struct intel_remapped_info {
+ struct intel_remapped_plane_info {
+ /* tiles */
+ unsigned int width, height, stride, offset;
+ } plane[2];
+ unsigned int unused;
+} __packed;
+
+static inline void assert_intel_remapped_info_is_packed(void)
+{
+ BUILD_BUG_ON(sizeof(struct intel_remapped_info) != 10*sizeof(unsigned int));
+}
+
struct intel_rotation_info {
struct intel_rotation_plane_info {
/* tiles */
@@ -186,6 +199,7 @@ enum i915_ggtt_view_type {
I915_GGTT_VIEW_NORMAL = 0,
I915_GGTT_VIEW_ROTATED = sizeof(struct intel_rotation_info),
I915_GGTT_VIEW_PARTIAL = sizeof(struct intel_partial_info),
+ I915_GGTT_VIEW_REMAPPED = sizeof(struct intel_remapped_info),
};
static inline void assert_i915_ggtt_view_type_is_unique(void)
@@ -197,6 +211,7 @@ static inline void assert_i915_ggtt_view_type_is_unique(void)
case I915_GGTT_VIEW_NORMAL:
case I915_GGTT_VIEW_PARTIAL:
case I915_GGTT_VIEW_ROTATED:
+ case I915_GGTT_VIEW_REMAPPED:
/* gcc complains if these are identical cases */
break;
}
@@ -208,6 +223,7 @@ struct i915_ggtt_view {
/* Members need to contain no holes/padding */
struct intel_partial_info partial;
struct intel_rotation_info rotated;
+ struct intel_remapped_info remapped;
};
};
diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
index 11d834f94220..eb54755ec25b 100644
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -164,6 +164,9 @@ vma_create(struct drm_i915_gem_object *obj,
} else if (view->type == I915_GGTT_VIEW_ROTATED) {
vma->size = intel_rotation_info_size(&view->rotated);
vma->size <<= PAGE_SHIFT;
+ } else if (view->type == I915_GGTT_VIEW_REMAPPED) {
+ vma->size = intel_remapped_info_size(&view->remapped);
+ vma->size <<= PAGE_SHIFT;
}
}
@@ -462,7 +465,8 @@ void __i915_vma_set_map_and_fenceable(struct i915_vma *vma)
* Explicitly disable for rotated VMA since the display does not
* need the fence and the VMA is not accessible to other users.
*/
- if (vma->ggtt_view.type == I915_GGTT_VIEW_ROTATED)
+ if (vma->ggtt_view.type == I915_GGTT_VIEW_ROTATED ||
+ vma->ggtt_view.type == I915_GGTT_VIEW_REMAPPED)
return;
fenceable = (vma->node.size >= vma->fence_size &&
diff --git a/drivers/gpu/drm/i915/i915_vma.h b/drivers/gpu/drm/i915/i915_vma.h
index f06d66377107..19bb3115226c 100644
--- a/drivers/gpu/drm/i915/i915_vma.h
+++ b/drivers/gpu/drm/i915/i915_vma.h
@@ -257,8 +257,11 @@ i915_vma_compare(struct i915_vma *vma,
*/
BUILD_BUG_ON(I915_GGTT_VIEW_NORMAL >= I915_GGTT_VIEW_PARTIAL);
BUILD_BUG_ON(I915_GGTT_VIEW_PARTIAL >= I915_GGTT_VIEW_ROTATED);
+ BUILD_BUG_ON(I915_GGTT_VIEW_ROTATED >= I915_GGTT_VIEW_REMAPPED);
BUILD_BUG_ON(offsetof(typeof(*view), rotated) !=
- offsetof(typeof(*view), partial));
+ offsetof(typeof(*view), partial) ||
+ offsetof(typeof(*view), rotated) !=
+ offsetof(typeof(*view), remapped));
return memcmp(&vma->ggtt_view.partial, &view->partial, view->type);
}
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index b39c941b4791..e6f48fab65de 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2005,6 +2005,17 @@ unsigned int intel_rotation_info_size(const struct intel_rotation_info *rot_info
return size;
}
+unsigned int intel_remapped_info_size(const struct intel_remapped_info *rem_info)
+{
+ unsigned int size = 0;
+ int i;
+
+ for (i = 0 ; i < ARRAY_SIZE(rem_info->plane); i++)
+ size += rem_info->plane[i].width * rem_info->plane[i].height;
+
+ return size;
+}
+
static void
intel_fill_fb_ggtt_view(struct i915_ggtt_view *view,
const struct drm_framebuffer *fb,
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 91b7fb6a07e1..2be5821fc24f 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1492,6 +1492,7 @@ unsigned int intel_fb_xy_to_linear(int x, int y,
void intel_add_fb_offsets(int *x, int *y,
const struct intel_plane_state *state, int plane);
unsigned int intel_rotation_info_size(const struct intel_rotation_info *rot_info);
+unsigned int intel_remapped_info_size(const struct intel_remapped_info *rem_info);
bool intel_has_pending_fb_unpin(struct drm_i915_private *dev_priv);
void intel_mark_busy(struct drm_i915_private *dev_priv);
void intel_mark_idle(struct drm_i915_private *dev_priv);
--
2.16.4
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