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drm/i915: Replace 4096 with PAGE_SIZE or I915_GTT_PAGE_SIZE

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Start converting over from the byte count to its semantic macro, either
we want to allocate the size of a physical page in main memory or we
want the size of a virtual page in the GTT. 4096 could mean either, but
PAGE_SIZE and I915_GTT_PAGE_SIZE are explicit and should help improve
code comprehension and future changes. In the future, we may want to use
variable GTT page sizes and so have the challenge of knowing which
hardcoded values were used to represent a physical page vs the virtual
page.

v2: Look for a few more 4096s to convert, discover IS_ALIGNED().
v3: 4096ul paranoia, make fence alignment a distinct value of 4096, keep
bdw stolen w/a as 4096 until we know better.
v4: Add asserts that i915_vma_insert() start/end are aligned to GTT page
sizes.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/20170110144734.26052-1-chris@chris-wilson.co.uk
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
This commit is contained in:
Chris Wilson
2017-01-10 14:47:34 +00:00
parent 2a20d6f858
commit f51455d442
15 changed files with 62 additions and 45 deletions
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10
drivers/gpu/drm/i915/intel_ringbuffer.c
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@@ -1736,7 +1736,7 @@ static int init_status_page(struct intel_engine_cs *engine)
void *vaddr;
int ret;
obj = i915_gem_object_create_internal(engine->i915, 4096);
obj = i915_gem_object_create_internal(engine->i915, PAGE_SIZE);
if (IS_ERR(obj)) {
DRM_ERROR("Failed to allocate status page\n");
return PTR_ERR(obj);
@@ -1777,7 +1777,7 @@ static int init_status_page(struct intel_engine_cs *engine)
engine->status_page.vma = vma;
engine->status_page.ggtt_offset = i915_ggtt_offset(vma);
engine->status_page.page_addr = memset(vaddr, 0, 4096);
engine->status_page.page_addr = memset(vaddr, 0, PAGE_SIZE);
DRM_DEBUG_DRIVER("%s hws offset: 0x%08x\n",
engine->name, i915_ggtt_offset(vma));
@@ -2049,7 +2049,7 @@ static int intel_init_ring_buffer(struct intel_engine_cs *engine)
}
/* Ring wraparound at offset 0 sometimes hangs. No idea why. */
ret = intel_ring_pin(ring, 4096);
ret = intel_ring_pin(ring, I915_GTT_PAGE_SIZE);
if (ret) {
intel_ring_free(ring);
goto error;
@@ -2466,7 +2466,7 @@ static void intel_ring_init_semaphores(struct drm_i915_private *dev_priv,
if (INTEL_GEN(dev_priv) >= 8 && !dev_priv->semaphore) {
struct i915_vma *vma;
obj = i915_gem_object_create(dev_priv, 4096);
obj = i915_gem_object_create(dev_priv, PAGE_SIZE);
if (IS_ERR(obj))
goto err;
@@ -2683,7 +2683,7 @@ int intel_init_render_ring_buffer(struct intel_engine_cs *engine)
return ret;
if (INTEL_GEN(dev_priv) >= 6) {
ret = intel_engine_create_scratch(engine, 4096);
ret = intel_engine_create_scratch(engine, PAGE_SIZE);
if (ret)
return ret;
} else if (HAS_BROKEN_CS_TLB(dev_priv)) {