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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: Dave 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.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Dave Gordon 2015-12-10 18:51:23 +00:00 committed by Daniel Vetter
parent c5baa566db
commit 033908aed5
6 changed files with 28 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/gpu/drm/i915/i915_drv.h
View File

@ -2907,6 +2907,9 @@ static inline int __sg_page_count(struct scatterlist *sg)
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 *
i915_gem_object_get_page(struct drm_i915_gem_object *obj, int n)
{

15
drivers/gpu/drm/i915/i915_gem.c
View File

@ -5185,6 +5185,21 @@ bool i915_gem_obj_is_pinned(struct drm_i915_gem_object *obj)
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 */
struct drm_i915_gem_object *
i915_gem_object_create_from_data(struct drm_device *dev,

8
drivers/gpu/drm/i915/i915_gem_execbuffer.c
View File

@ -264,7 +264,7 @@ relocate_entry_cpu(struct drm_i915_gem_object *obj,
if (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));
*(uint32_t *)(vaddr + page_offset) = lower_32_bits(delta);
@ -273,7 +273,7 @@ relocate_entry_cpu(struct drm_i915_gem_object *obj,
if (page_offset == 0) {
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));
}
@ -355,7 +355,7 @@ relocate_entry_clflush(struct drm_i915_gem_object *obj,
if (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));
clflush_write32(vaddr + page_offset, lower_32_bits(delta));
@ -364,7 +364,7 @@ relocate_entry_clflush(struct drm_i915_gem_object *obj,
if (page_offset == 0) {
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));
}

2
drivers/gpu/drm/i915/i915_gem_render_state.c
View File

@ -103,7 +103,7 @@ static int render_state_setup(struct render_state *so)
if (ret)
return ret;
page = sg_page(so->obj->pages->sgl);
page = i915_gem_object_get_dirty_page(so->obj, 0);
d = kmap(page);
while (i < rodata->batch_items) {

2
drivers/gpu/drm/i915/i915_guc_submission.c
View File

@ -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(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[CTX_RING_BUFFER_START+1] = i915_gem_obj_ggtt_offset(rb_obj);

11
drivers/gpu/drm/i915/intel_lrc.c
View File

@ -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(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[CTX_RING_TAIL+1] = rq->tail;
@ -1425,7 +1425,7 @@ static int intel_init_workaround_bb(struct intel_engine_cs *ring)
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);
offset = 0;
@ -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
* 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);
/* 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
}
kunmap_atomic(reg_state);
ctx_obj->dirty = 1;
set_page_dirty(page);
i915_gem_object_unpin_pages(ctx_obj);
return 0;
@ -2536,7 +2533,7 @@ void intel_lr_context_reset(struct drm_device *dev,
WARN(1, "Failed get_pages for context obj\n");
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[CTX_RING_HEAD+1] = 0;