From 1a74fc0b3f49a0603f230b6f087da33bda3d7c66 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Thu, 9 May 2019 15:21:52 +0300 Subject: [PATCH] drm/i915: Add a new "remapped" gtt_view MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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. v2: Use intel_remapped_plane_info base type s/unused/unused_mbz/ (Chris) Separate BUILD_BUG_ON()s (Chris) Use I915_GTT_PAGE_SIZE (Chris) v3: Use i915_gem_object_get_dma_address() (Chris) Trim the sg (Tvrtko) v4: Actually trim this time. Limit the max length to one row of pages to keep things simple Cc: Chris Wilson Cc: Tvrtko Ursulin Reviewed-by: Daniel Vetter Reviewed-by: Chris Wilson Signed-off-by: Ville Syrjälä Link: https://patchwork.freedesktop.org/patch/msgid/20190509122159.24376-2-ville.syrjala@linux.intel.com Reviewed-by: Maarten Lankhorst --- drivers/gpu/drm/i915/i915_debugfs.c | 12 +++++ drivers/gpu/drm/i915/i915_drv.h | 4 ++ drivers/gpu/drm/i915/i915_gem.c | 17 +++++- drivers/gpu/drm/i915/i915_gem_gtt.c | 88 +++++++++++++++++++++++++++++++ drivers/gpu/drm/i915/i915_gem_gtt.h | 25 +++++++-- drivers/gpu/drm/i915/i915_vma.c | 6 ++- drivers/gpu/drm/i915/i915_vma.h | 3 ++ drivers/gpu/drm/i915/intel_display.c | 11 ++++ drivers/gpu/drm/i915/intel_drv.h | 1 + drivers/gpu/drm/i915/selftests/i915_vma.c | 6 +-- 10 files changed, 163 insertions(+), 10 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index 072464a18050..633a08c0f907 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -212,6 +212,18 @@ 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_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 5801f5407589..1ad3818d2676 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -2864,6 +2864,10 @@ i915_gem_object_get_dirty_page(struct drm_i915_gem_object *obj, unsigned int n); dma_addr_t +i915_gem_object_get_dma_address_len(struct drm_i915_gem_object *obj, + unsigned long n, + unsigned int *len); +dma_addr_t i915_gem_object_get_dma_address(struct drm_i915_gem_object *obj, unsigned long n); diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 2fcec1bfb038..4e474bcf4c22 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -5081,16 +5081,29 @@ i915_gem_object_get_dirty_page(struct drm_i915_gem_object *obj, } dma_addr_t -i915_gem_object_get_dma_address(struct drm_i915_gem_object *obj, - unsigned long n) +i915_gem_object_get_dma_address_len(struct drm_i915_gem_object *obj, + unsigned long n, + unsigned int *len) { struct scatterlist *sg; unsigned int offset; sg = i915_gem_object_get_sg(obj, n, &offset); + + if (len) + *len = sg_dma_len(sg) - (offset << PAGE_SHIFT); + return sg_dma_address(sg) + (offset << PAGE_SHIFT); } +dma_addr_t +i915_gem_object_get_dma_address(struct drm_i915_gem_object *obj, + unsigned long n) +{ + return i915_gem_object_get_dma_address_len(obj, n, NULL); +} + + int i915_gem_object_attach_phys(struct drm_i915_gem_object *obj, int align) { struct sg_table *pages; diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c index 8f5db787b7f2..9ed41aefb456 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c @@ -3608,6 +3608,89 @@ err_st_alloc: return ERR_PTR(ret); } +static struct scatterlist * +remap_pages(struct drm_i915_gem_object *obj, unsigned int offset, + unsigned int width, unsigned int height, + unsigned int stride, + struct sg_table *st, struct scatterlist *sg) +{ + unsigned int row; + + 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 += stride - width; + } + + 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 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(rem_info->plane); i++) { + sg = remap_pages(obj, rem_info->plane[i].offset, + rem_info->plane[i].width, rem_info->plane[i].height, + rem_info->plane[i].stride, st, sg); + } + + i915_sg_trim(st); + + return st; + +err_sg_alloc: + kfree(st); +err_st_alloc: + + 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) @@ -3686,6 +3769,11 @@ 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 2fafa04c45ec..98fc71053f7c 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.h +++ b/drivers/gpu/drm/i915/i915_gem_gtt.h @@ -163,11 +163,18 @@ typedef u64 gen8_ppgtt_pml4e_t; struct sg_table; +struct intel_remapped_plane_info { + /* in gtt pages */ + unsigned int width, height, stride, offset; +} __packed; + +struct intel_remapped_info { + struct intel_remapped_plane_info plane[2]; + unsigned int unused_mbz; +} __packed; + struct intel_rotation_info { - struct intel_rotation_plane_info { - /* tiles */ - unsigned int width, height, stride, offset; - } plane[2]; + struct intel_remapped_plane_info plane[2]; } __packed; struct intel_partial_info { @@ -179,12 +186,20 @@ 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_gem_gtt_types(void) { BUILD_BUG_ON(sizeof(struct intel_rotation_info) != 8*sizeof(unsigned int)); BUILD_BUG_ON(sizeof(struct intel_partial_info) != sizeof(u64) + sizeof(unsigned int)); + BUILD_BUG_ON(sizeof(struct intel_remapped_info) != 9*sizeof(unsigned int)); + + /* Check that rotation/remapped shares offsets for simplicity */ + BUILD_BUG_ON(offsetof(struct intel_remapped_info, plane[0]) != + offsetof(struct intel_rotation_info, plane[0])); + BUILD_BUG_ON(offsetofend(struct intel_remapped_info, plane[1]) != + offsetofend(struct intel_rotation_info, plane[1])); /* As we encode the size of each branch inside the union into its type, * we have to be careful that each branch has a unique size. @@ -193,6 +208,7 @@ static inline void assert_i915_gem_gtt_types(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; } @@ -204,6 +220,7 @@ 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 d4d308b6d1d8..c68b435d4064 100644 --- a/drivers/gpu/drm/i915/i915_vma.c +++ b/drivers/gpu/drm/i915/i915_vma.c @@ -159,6 +159,9 @@ 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; } } @@ -484,7 +487,8 @@ 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 6eab70953a57..8543d2953cd1 100644 --- a/drivers/gpu/drm/i915/i915_vma.h +++ b/drivers/gpu/drm/i915/i915_vma.h @@ -277,8 +277,11 @@ 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)); + BUILD_BUG_ON(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 b53676e558cb..95c850d7faab 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -1997,6 +1997,17 @@ 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 30b2d6ed2d53..270f5bb43d9b 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -1461,6 +1461,7 @@ unsigned int intel_fb_align_height(const struct drm_framebuffer *fb, 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); diff --git a/drivers/gpu/drm/i915/selftests/i915_vma.c b/drivers/gpu/drm/i915/selftests/i915_vma.c index fc594b030f5a..18dc221cb22b 100644 --- a/drivers/gpu/drm/i915/selftests/i915_vma.c +++ b/drivers/gpu/drm/i915/selftests/i915_vma.c @@ -397,8 +397,8 @@ assert_rotated(struct drm_i915_gem_object *obj, return sg; } -static unsigned int rotated_size(const struct intel_rotation_plane_info *a, - const struct intel_rotation_plane_info *b) +static unsigned int rotated_size(const struct intel_remapped_plane_info *a, + const struct intel_remapped_plane_info *b) { return a->width * a->height + b->width * b->height; } @@ -408,7 +408,7 @@ static int igt_vma_rotate(void *arg) struct i915_ggtt *ggtt = arg; struct i915_address_space *vm = &ggtt->vm; struct drm_i915_gem_object *obj; - const struct intel_rotation_plane_info planes[] = { + const struct intel_remapped_plane_info planes[] = { { .width = 1, .height = 1, .stride = 1 }, { .width = 2, .height = 2, .stride = 2 }, { .width = 4, .height = 4, .stride = 4 }, -- 2.11.0