[Intel-gfx] [PATCH v2 1/2] drm/i915: refactor i915_gem_object_pin_map()

[Dave Gordon]

The recently-added i915_gem_object_pin_map() can be further optimised
for "small" objects. To facilitate this, and simplify the error paths
before adding the new code, this patch pulls out the "mapping" part of
the operation (involving local allocations which must be undone before
return) into its own subfunction.

The next patch will then insert the new optimisation into the middle of
the now-separated subfunction.

This reorganisation will probably not affect the generated code, as the
compiler will most likely inline it anyway, but it makes the logical
structure a bit clearer and easier to modify.

v2:
    Restructure loop-over-pages & error check (Chris Wilson)

Signed-off-by: Dave Gordon <david.s.gordon at intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_gem.c | 58 ++++++++++++++++++++++++++---------------
 1 file changed, 37 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 6ce2c31..5344b6d 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2396,6 +2396,42 @@ static void i915_gem_object_free_mmap_offset(struct drm_i915_gem_object *obj)
 	return 0;
 }
 
+/* The 'mapping' part of i915_gem_object_pin_map() below */
+static void *i915_gem_object_map(const struct drm_i915_gem_object *obj)
+{
+	unsigned long n_pages = obj->base.size >> PAGE_SHIFT;
+	struct scatterlist *sg = obj->pages->sgl;
+	struct sg_page_iter sg_iter;
+	struct page **pages;
+	unsigned long i = 0;
+	void *addr = NULL;
+
+	/* A single page can always be kmapped */
+	if (n_pages == 1)
+		return kmap(sg_page(sg));
+
+	pages = drm_malloc_gfp(n_pages, sizeof(*pages), GFP_TEMPORARY);
+	if (pages == NULL) {
+		DRM_DEBUG_DRIVER("Failed to get space for pages\n");
+		return NULL;
+	}
+
+	for_each_sg_page(sg, &sg_iter, n_pages, 0)
+		pages[i++] = sg_page_iter_page(&sg_iter);
+
+	/* Check that we have the expected number of pages */
+	if (!WARN_ON(i != n_pages))
+		addr = vmap(pages, n_pages, 0, PAGE_KERNEL);
+
+	if (addr == NULL)
+		DRM_DEBUG_DRIVER("Failed to vmap pages\n");
+
+	drm_free_large(pages);
+
+	return addr;
+}
+
+/* get, pin, and map the pages of the object into kernel space */
 void *i915_gem_object_pin_map(struct drm_i915_gem_object *obj)
 {
 	int ret;
@@ -2409,27 +2445,7 @@ void *i915_gem_object_pin_map(struct drm_i915_gem_object *obj)
 	i915_gem_object_pin_pages(obj);
 
 	if (obj->mapping == NULL) {
-		struct page **pages;
-
-		pages = NULL;
-		if (obj->base.size == PAGE_SIZE)
-			obj->mapping = kmap(sg_page(obj->pages->sgl));
-		else
-			pages = drm_malloc_gfp(obj->base.size >> PAGE_SHIFT,
-					       sizeof(*pages),
-					       GFP_TEMPORARY);
-		if (pages != NULL) {
-			struct sg_page_iter sg_iter;
-			int n;
-
-			n = 0;
-			for_each_sg_page(obj->pages->sgl, &sg_iter,
-					 obj->pages->nents, 0)
-				pages[n++] = sg_page_iter_page(&sg_iter);
-
-			obj->mapping = vmap(pages, n, 0, PAGE_KERNEL);
-			drm_free_large(pages);
-		}
+		obj->mapping = i915_gem_object_map(obj);
 		if (obj->mapping == NULL) {
 			i915_gem_object_unpin_pages(obj);
 			return ERR_PTR(-ENOMEM);
-- 
1.9.1