[05/22] drm/i915: Make use of the new sg_map helper function

Commit Message

Logan Gunthorpe April 13, 2017, 10:05 p.m. UTC

This is a single straightforward conversion from kmap to sg_map.

Signed-off-by: Logan Gunthorpe <[e-mail]>
---
 drivers/gpu/drm/i915/i915_gem.c | 27 ++++++++++++++++-----------
 1 file changed, 16 insertions(+), 11 deletions(-)

Comments

Logan Gunthorpe April 18, 2017, 3:44 p.m. UTC | #1

On 18/04/17 12:44 AM, Daniel Vetter wrote:
> On Thu, Apr 13, 2017 at 04:05:18PM -0600, Logan Gunthorpe wrote:
>> This is a single straightforward conversion from kmap to sg_map.
>>
>> Signed-off-by: Logan Gunthorpe <[e-mail]>
> 
> Acked-by: Daniel Vetter <[e-mail]>
> 
> Probably makes sense to merge through some other tree, but please be aware
> of the considerable churn rate in i915 (i.e. make sure your tree is in
> linux-next before you send a pull request for this). Plane B would be to
> get the prep patch in first and then merge the i915 conversion one kernel
> release later.

Yes, as per what I said in my cover letter, I was leaning towards a
"Plan B" style approach.

Logan

Patch

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 67b1fc5..1b1b91a 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2188,6 +2188,15 @@  static void __i915_gem_object_reset_page_iter(struct drm_i915_gem_object *obj)
 		radix_tree_delete(&obj->mm.get_page.radix, iter.index);
 }
 
+static void i915_gem_object_unmap(const struct drm_i915_gem_object *obj,
+				  void *ptr)
+{
+	if (is_vmalloc_addr(ptr))
+		vunmap(ptr);
+	else
+		sg_unmap(obj->mm.pages->sgl, ptr, SG_KMAP);
+}
+
 void __i915_gem_object_put_pages(struct drm_i915_gem_object *obj,
 				 enum i915_mm_subclass subclass)
 {
@@ -2215,10 +2224,7 @@  void __i915_gem_object_put_pages(struct drm_i915_gem_object *obj,
 		void *ptr;
 
 		ptr = ptr_mask_bits(obj->mm.mapping);
-		if (is_vmalloc_addr(ptr))
-			vunmap(ptr);
-		else
-			kunmap(kmap_to_page(ptr));
+		i915_gem_object_unmap(obj, ptr);
 
 		obj->mm.mapping = NULL;
 	}
@@ -2475,8 +2481,11 @@  static void *i915_gem_object_map(const struct drm_i915_gem_object *obj,
 	void *addr;
 
 	/* A single page can always be kmapped */
-	if (n_pages == 1 && type == I915_MAP_WB)
-		return kmap(sg_page(sgt->sgl));
+	if (n_pages == 1 && type == I915_MAP_WB) {
+		addr = sg_map(sgt->sgl, SG_KMAP);
+		if (IS_ERR(addr))
+			return NULL;
+	}
 
 	if (n_pages > ARRAY_SIZE(stack_pages)) {
 		/* Too big for stack -- allocate temporary array instead */
@@ -2543,11 +2552,7 @@  void *i915_gem_object_pin_map(struct drm_i915_gem_object *obj,
 			goto err_unpin;
 		}
 
-		if (is_vmalloc_addr(ptr))
-			vunmap(ptr);
-		else
-			kunmap(kmap_to_page(ptr));
-
+		i915_gem_object_unmap(obj, ptr);
 		ptr = obj->mm.mapping = NULL;
 	}