diff mbox

[151/190] drm/i915: Allow DMA pagetables to use highmem

Message ID 1452510091-6833-10-git-send-email-chris@chris-wilson.co.uk (mailing list archive)
State New, archived
Headers show

Commit Message

Chris Wilson Jan. 11, 2016, 11 a.m. UTC 
As we never need to directly access the pages we allocate for scratch and
the pagetables, and always remap them into the GTT through the dma
remapper, we do not need to limit the allocations to lowmem i.e. we can
pass in the __GFP_HIGHMEM flag to the page allocation.

For backwards compatibility, e.g. certain old GPUs not liking highmem
for certain functions that may be accidentally mapped to the scratch
page by userspace, keep the GMCH probe as only allocating form DMA32.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_gem_gtt.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)
diff mbox

Patch

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index fa7dedd395ee..faee28c807f2 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -32,6 +32,8 @@ 
 #include "i915_trace.h"
 #include "intel_drv.h"
 
+#define I915_GFP_DMA (GFP_KERNEL | __GFP_HIGHMEM)
+
 /**
  * DOC: Global GTT views
  *
@@ -330,7 +332,7 @@  static int __setup_page_dma(struct drm_device *dev,
 
 static int setup_page_dma(struct drm_device *dev, struct i915_page_dma *p)
 {
-	return __setup_page_dma(dev, p, GFP_KERNEL);
+	return __setup_page_dma(dev, p, I915_GFP_DMA);
 }
 
 static void cleanup_page_dma(struct drm_device *dev, struct i915_page_dma *p)
@@ -393,9 +395,9 @@  static void fill_page_dma_32(struct drm_device *dev, struct i915_page_dma *p,
 }
 
 static int
-setup_scratch_page(struct drm_device *dev, struct i915_page_dma *scratch)
+setup_scratch_page(struct drm_device *dev, struct i915_page_dma *scratch, gfp_t gfp)
 {
-	return __setup_page_dma(dev, scratch, GFP_DMA32 | __GFP_ZERO);
+	return __setup_page_dma(dev, scratch, gfp | __GFP_ZERO);
 }
 
 static void cleanup_scratch_page(struct drm_device *dev,
@@ -849,7 +851,7 @@  static int gen8_init_scratch(struct i915_address_space *vm)
 	struct drm_device *dev = vm->dev;
 	int ret;
 
-	ret = setup_scratch_page(dev, &vm->scratch_page);
+	ret = setup_scratch_page(dev, &vm->scratch_page, I915_GFP_DMA);
 	if (ret)
 		return ret;
 
@@ -1927,7 +1929,7 @@  static int gen6_init_scratch(struct i915_address_space *vm)
 	struct drm_device *dev = vm->dev;
 	int ret;
 
-	ret = setup_scratch_page(dev, &vm->scratch_page);
+	ret = setup_scratch_page(dev, &vm->scratch_page, I915_GFP_DMA);
 	if (ret)
 		return ret;
 
@@ -2879,7 +2881,7 @@  static int ggtt_probe_common(struct drm_device *dev,
 		return -ENOMEM;
 	}
 
-	ret = setup_scratch_page(dev, &dev_priv->gtt.base.scratch_page);
+	ret = setup_scratch_page(dev, &dev_priv->gtt.base.scratch_page, GFP_DMA32);
 	if (ret) {
 		DRM_ERROR("Scratch setup failed\n");
 		/* iounmap will also get called at remove, but meh */