Commit 033908ae authored by Dave Gordon's avatar Dave Gordon Committed by Daniel Vetter

drm/i915: mark GEM object pages dirty when mapped & written by the CPU

In various places, a single page of a (regular) GEM object is mapped into
CPU address space and updated. In each such case, either the page or the
the object should be marked dirty, to ensure that the modifications are
not discarded if the object is evicted under memory pressure.

The typical sequence is:
	va = kmap_atomic(i915_gem_object_get_page(obj, pageno));
	*(va+offset) = ...
	kunmap_atomic(va);

Here we introduce i915_gem_object_get_dirty_page(), which performs the
same operation as i915_gem_object_get_page() but with the side-effect
of marking the returned page dirty in the pagecache.  This will ensure
that if the object is subsequently evicted (due to memory pressure),
the changes are written to backing store rather than discarded.

Note that it works only for regular (shmfs-backed) GEM objects, but (at
least for now) those are the only ones that are updated in this way --
the objects in question are contexts and batchbuffers, which are always
shmfs-backed.

Separate patches deal with the cases where whole objects are (or may
be) dirtied.

v3: Mark two more pages dirty in the page-boundary-crossing
    cases of the execbuffer relocation code [Chris Wilson]
Signed-off-by: default avatarDave Gordon <david.s.gordon@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1449773486-30822-2-git-send-email-david.s.gordon@intel.comReviewed-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent c5baa566
...@@ -2907,6 +2907,9 @@ static inline int __sg_page_count(struct scatterlist *sg) ...@@ -2907,6 +2907,9 @@ static inline int __sg_page_count(struct scatterlist *sg)
return sg->length >> PAGE_SHIFT; return sg->length >> PAGE_SHIFT;
} }
struct page *
i915_gem_object_get_dirty_page(struct drm_i915_gem_object *obj, int n);
static inline struct page * static inline struct page *
i915_gem_object_get_page(struct drm_i915_gem_object *obj, int n) i915_gem_object_get_page(struct drm_i915_gem_object *obj, int n)
{ {
......
...@@ -5185,6 +5185,21 @@ bool i915_gem_obj_is_pinned(struct drm_i915_gem_object *obj) ...@@ -5185,6 +5185,21 @@ bool i915_gem_obj_is_pinned(struct drm_i915_gem_object *obj)
return false; return false;
} }
/* Like i915_gem_object_get_page(), but mark the returned page dirty */
struct page *
i915_gem_object_get_dirty_page(struct drm_i915_gem_object *obj, int n)
{
struct page *page;
/* Only default objects have per-page dirty tracking */
if (WARN_ON(obj->ops != &i915_gem_object_ops))
return NULL;
page = i915_gem_object_get_page(obj, n);
set_page_dirty(page);
return page;
}
/* Allocate a new GEM object and fill it with the supplied data */ /* Allocate a new GEM object and fill it with the supplied data */
struct drm_i915_gem_object * struct drm_i915_gem_object *
i915_gem_object_create_from_data(struct drm_device *dev, i915_gem_object_create_from_data(struct drm_device *dev,
......
...@@ -264,7 +264,7 @@ relocate_entry_cpu(struct drm_i915_gem_object *obj, ...@@ -264,7 +264,7 @@ relocate_entry_cpu(struct drm_i915_gem_object *obj,
if (ret) if (ret)
return ret; return ret;
vaddr = kmap_atomic(i915_gem_object_get_page(obj, vaddr = kmap_atomic(i915_gem_object_get_dirty_page(obj,
reloc->offset >> PAGE_SHIFT)); reloc->offset >> PAGE_SHIFT));
*(uint32_t *)(vaddr + page_offset) = lower_32_bits(delta); *(uint32_t *)(vaddr + page_offset) = lower_32_bits(delta);
...@@ -273,7 +273,7 @@ relocate_entry_cpu(struct drm_i915_gem_object *obj, ...@@ -273,7 +273,7 @@ relocate_entry_cpu(struct drm_i915_gem_object *obj,
if (page_offset == 0) { if (page_offset == 0) {
kunmap_atomic(vaddr); kunmap_atomic(vaddr);
vaddr = kmap_atomic(i915_gem_object_get_page(obj, vaddr = kmap_atomic(i915_gem_object_get_dirty_page(obj,
(reloc->offset + sizeof(uint32_t)) >> PAGE_SHIFT)); (reloc->offset + sizeof(uint32_t)) >> PAGE_SHIFT));
} }
...@@ -355,7 +355,7 @@ relocate_entry_clflush(struct drm_i915_gem_object *obj, ...@@ -355,7 +355,7 @@ relocate_entry_clflush(struct drm_i915_gem_object *obj,
if (ret) if (ret)
return ret; return ret;
vaddr = kmap_atomic(i915_gem_object_get_page(obj, vaddr = kmap_atomic(i915_gem_object_get_dirty_page(obj,
reloc->offset >> PAGE_SHIFT)); reloc->offset >> PAGE_SHIFT));
clflush_write32(vaddr + page_offset, lower_32_bits(delta)); clflush_write32(vaddr + page_offset, lower_32_bits(delta));
...@@ -364,7 +364,7 @@ relocate_entry_clflush(struct drm_i915_gem_object *obj, ...@@ -364,7 +364,7 @@ relocate_entry_clflush(struct drm_i915_gem_object *obj,
if (page_offset == 0) { if (page_offset == 0) {
kunmap_atomic(vaddr); kunmap_atomic(vaddr);
vaddr = kmap_atomic(i915_gem_object_get_page(obj, vaddr = kmap_atomic(i915_gem_object_get_dirty_page(obj,
(reloc->offset + sizeof(uint32_t)) >> PAGE_SHIFT)); (reloc->offset + sizeof(uint32_t)) >> PAGE_SHIFT));
} }
......
...@@ -103,7 +103,7 @@ static int render_state_setup(struct render_state *so) ...@@ -103,7 +103,7 @@ static int render_state_setup(struct render_state *so)
if (ret) if (ret)
return ret; return ret;
page = sg_page(so->obj->pages->sgl); page = i915_gem_object_get_dirty_page(so->obj, 0);
d = kmap(page); d = kmap(page);
while (i < rodata->batch_items) { while (i < rodata->batch_items) {
......
...@@ -568,7 +568,7 @@ static void lr_context_update(struct drm_i915_gem_request *rq) ...@@ -568,7 +568,7 @@ static void lr_context_update(struct drm_i915_gem_request *rq)
WARN_ON(!i915_gem_obj_is_pinned(ctx_obj)); WARN_ON(!i915_gem_obj_is_pinned(ctx_obj));
WARN_ON(!i915_gem_obj_is_pinned(rb_obj)); WARN_ON(!i915_gem_obj_is_pinned(rb_obj));
page = i915_gem_object_get_page(ctx_obj, LRC_STATE_PN); page = i915_gem_object_get_dirty_page(ctx_obj, LRC_STATE_PN);
reg_state = kmap_atomic(page); reg_state = kmap_atomic(page);
reg_state[CTX_RING_BUFFER_START+1] = i915_gem_obj_ggtt_offset(rb_obj); reg_state[CTX_RING_BUFFER_START+1] = i915_gem_obj_ggtt_offset(rb_obj);
......
...@@ -372,7 +372,7 @@ static int execlists_update_context(struct drm_i915_gem_request *rq) ...@@ -372,7 +372,7 @@ static int execlists_update_context(struct drm_i915_gem_request *rq)
WARN_ON(!i915_gem_obj_is_pinned(ctx_obj)); WARN_ON(!i915_gem_obj_is_pinned(ctx_obj));
WARN_ON(!i915_gem_obj_is_pinned(rb_obj)); WARN_ON(!i915_gem_obj_is_pinned(rb_obj));
page = i915_gem_object_get_page(ctx_obj, LRC_STATE_PN); page = i915_gem_object_get_dirty_page(ctx_obj, LRC_STATE_PN);
reg_state = kmap_atomic(page); reg_state = kmap_atomic(page);
reg_state[CTX_RING_TAIL+1] = rq->tail; reg_state[CTX_RING_TAIL+1] = rq->tail;
...@@ -1425,7 +1425,7 @@ static int intel_init_workaround_bb(struct intel_engine_cs *ring) ...@@ -1425,7 +1425,7 @@ static int intel_init_workaround_bb(struct intel_engine_cs *ring)
return ret; return ret;
} }
page = i915_gem_object_get_page(wa_ctx->obj, 0); page = i915_gem_object_get_dirty_page(wa_ctx->obj, 0);
batch = kmap_atomic(page); batch = kmap_atomic(page);
offset = 0; offset = 0;
...@@ -2264,7 +2264,7 @@ populate_lr_context(struct intel_context *ctx, struct drm_i915_gem_object *ctx_o ...@@ -2264,7 +2264,7 @@ populate_lr_context(struct intel_context *ctx, struct drm_i915_gem_object *ctx_o
/* The second page of the context object contains some fields which must /* The second page of the context object contains some fields which must
* be set up prior to the first execution. */ * be set up prior to the first execution. */
page = i915_gem_object_get_page(ctx_obj, LRC_STATE_PN); page = i915_gem_object_get_dirty_page(ctx_obj, LRC_STATE_PN);
reg_state = kmap_atomic(page); reg_state = kmap_atomic(page);
/* A context is actually a big batch buffer with several MI_LOAD_REGISTER_IMM /* A context is actually a big batch buffer with several MI_LOAD_REGISTER_IMM
...@@ -2350,9 +2350,6 @@ populate_lr_context(struct intel_context *ctx, struct drm_i915_gem_object *ctx_o ...@@ -2350,9 +2350,6 @@ populate_lr_context(struct intel_context *ctx, struct drm_i915_gem_object *ctx_o
} }
kunmap_atomic(reg_state); kunmap_atomic(reg_state);
ctx_obj->dirty = 1;
set_page_dirty(page);
i915_gem_object_unpin_pages(ctx_obj); i915_gem_object_unpin_pages(ctx_obj);
return 0; return 0;
...@@ -2536,7 +2533,7 @@ void intel_lr_context_reset(struct drm_device *dev, ...@@ -2536,7 +2533,7 @@ void intel_lr_context_reset(struct drm_device *dev,
WARN(1, "Failed get_pages for context obj\n"); WARN(1, "Failed get_pages for context obj\n");
continue; continue;
} }
page = i915_gem_object_get_page(ctx_obj, LRC_STATE_PN); page = i915_gem_object_get_dirty_page(ctx_obj, LRC_STATE_PN);
reg_state = kmap_atomic(page); reg_state = kmap_atomic(page);
reg_state[CTX_RING_HEAD+1] = 0; reg_state[CTX_RING_HEAD+1] = 0;
......
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