[PATCH 5/6] drm,i915: Introduce drm_malloc_gfp()

[Chris Wilson]

I have instances where I want to use drm_malloc_ab() but with a custom
gfp mask. And with those, where I want a temporary allocation, I want to
try a high-order kmalloc() before using a vmalloc().

So refactor my usage into drm_malloc_gfp().

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: dri-devel at lists.freedesktop.org
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
Acked-by: Dave Airlie <airlied at redhat.com>
---
 drivers/gpu/drm/i915/i915_gem.c            |  4 +---
 drivers/gpu/drm/i915/i915_gem_execbuffer.c |  8 +++-----
 drivers/gpu/drm/i915/i915_gem_gtt.c        |  5 +++--
 drivers/gpu/drm/i915/i915_gem_userptr.c    | 15 ++++-----------
 include/drm/drm_mem_util.h                 | 19 +++++++++++++++++++
 5 files changed, 30 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index be4cf13343d5..985f067c1f0e 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2421,9 +2421,7 @@ void *i915_gem_object_pin_vmap(struct drm_i915_gem_object *obj)
 		int n;
 
 		n = obj->base.size >> PAGE_SHIFT;
-		pages = kmalloc(n*sizeof(*pages), GFP_TEMPORARY | __GFP_NOWARN);
-		if (pages == NULL)
-			pages = drm_malloc_ab(n, sizeof(*pages));
+		pages = drm_malloc_gfp(n, sizeof(*pages), GFP_TEMPORARY);
 		if (pages != NULL) {
 			n = 0;
 			for_each_sg_page(obj->pages->sgl, &sg_iter, obj->pages->nents, 0)
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 0ee61fd014df..6ee4f00f620c 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -1783,11 +1783,9 @@ i915_gem_execbuffer2(struct drm_device *dev, void *data,
 		return -EINVAL;
 	}
 
-	exec2_list = kmalloc(sizeof(*exec2_list)*args->buffer_count,
-			     GFP_TEMPORARY | __GFP_NOWARN | __GFP_NORETRY);
-	if (exec2_list == NULL)
-		exec2_list = drm_malloc_ab(sizeof(*exec2_list),
-					   args->buffer_count);
+	exec2_list = drm_malloc_gfp(args->buffer_count,
+				    sizeof(*exec2_list),
+				    GFP_TEMPORARY);
 	if (exec2_list == NULL) {
 		DRM_DEBUG("Failed to allocate exec list for %d buffers\n",
 			  args->buffer_count);
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index ae9cb2735767..18f2bd7caad5 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -3413,8 +3413,9 @@ intel_rotate_fb_obj_pages(struct intel_rotation_info *rot_info,
 	int ret = -ENOMEM;
 
 	/* Allocate a temporary list of source pages for random access. */
-	page_addr_list = drm_malloc_ab(obj->base.size / PAGE_SIZE,
-				       sizeof(dma_addr_t));
+	page_addr_list = drm_malloc_gfp(obj->base.size / PAGE_SIZE,
+					sizeof(dma_addr_t),
+					GFP_TEMPORARY);
 	if (!page_addr_list)
 		return ERR_PTR(ret);
 
diff --git a/drivers/gpu/drm/i915/i915_gem_userptr.c b/drivers/gpu/drm/i915/i915_gem_userptr.c
index 291a9393493d..67883ebf9504 100644
--- a/drivers/gpu/drm/i915/i915_gem_userptr.c
+++ b/drivers/gpu/drm/i915/i915_gem_userptr.c
@@ -494,10 +494,7 @@ __i915_gem_userptr_get_pages_worker(struct work_struct *_work)
 	ret = -ENOMEM;
 	pinned = 0;
 
-	pvec = kmalloc(npages*sizeof(struct page *),
-		       GFP_TEMPORARY | __GFP_NOWARN | __GFP_NORETRY);
-	if (pvec == NULL)
-		pvec = drm_malloc_ab(npages, sizeof(struct page *));
+	pvec = drm_malloc_gfp(npages, sizeof(struct page *), GFP_TEMPORARY);
 	if (pvec != NULL) {
 		struct mm_struct *mm = obj->userptr.mm->mm;
 
@@ -634,14 +631,10 @@ i915_gem_userptr_get_pages(struct drm_i915_gem_object *obj)
 	pvec = NULL;
 	pinned = 0;
 	if (obj->userptr.mm->mm == current->mm) {
-		pvec = kmalloc(num_pages*sizeof(struct page *),
-			       GFP_TEMPORARY | __GFP_NOWARN | __GFP_NORETRY);
+		pvec = drm_malloc_gfp(num_pages, sizeof(struct page *), GFP_TEMPORARY);
 		if (pvec == NULL) {
-			pvec = drm_malloc_ab(num_pages, sizeof(struct page *));
-			if (pvec == NULL) {
-				__i915_gem_userptr_set_active(obj, false);
-				return -ENOMEM;
-			}
+			__i915_gem_userptr_set_active(obj, false);
+			return -ENOMEM;
 		}
 
 		pinned = __get_user_pages_fast(obj->userptr.ptr, num_pages,
diff --git a/include/drm/drm_mem_util.h b/include/drm/drm_mem_util.h
index e42495ad8136..741ce75a72b4 100644
--- a/include/drm/drm_mem_util.h
+++ b/include/drm/drm_mem_util.h
@@ -54,6 +54,25 @@ static __inline__ void *drm_malloc_ab(size_t nmemb, size_t size)
 			 GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL);
 }
 
+static __inline__ void *drm_malloc_gfp(size_t nmemb, size_t size, gfp_t gfp)
+{
+	if (size != 0 && nmemb > SIZE_MAX / size)
+		return NULL;
+
+	if (size * nmemb <= PAGE_SIZE)
+	    return kmalloc(nmemb * size, gfp);
+
+	if (gfp & __GFP_RECLAIMABLE) {
+		void *ptr = kmalloc(nmemb * size,
+				    gfp | __GFP_NOWARN | __GFP_NORETRY);
+		if (ptr)
+			return ptr;
+	}
+
+	return __vmalloc(size * nmemb,
+			 gfp | __GFP_HIGHMEM, PAGE_KERNEL);
+}
+
 static __inline void drm_free_large(void *ptr)
 {
 	kvfree(ptr);
-- 
2.8.0.rc3