drm/i915: push set_pages down to the callers
Each backend is now responsible for calling __i915_gem_object_set_pages
upon successfully gathering its backing storage. This eliminates the
inconsistency between the async and sync paths, which stands out even
more when we start throwing around an sg_mask in a later patch.
Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171006145041.21673-6-matthew.auld@intel.com
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171006221833.32439-5-chris@chris-wilson.co.uk
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 1da1f52..42f2ca1 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -162,8 +162,7 @@ i915_gem_get_aperture_ioctl(struct drm_device *dev, void *data,
return 0;
}
-static struct sg_table *
-i915_gem_object_get_pages_phys(struct drm_i915_gem_object *obj)
+static int i915_gem_object_get_pages_phys(struct drm_i915_gem_object *obj)
{
struct address_space *mapping = obj->base.filp->f_mapping;
drm_dma_handle_t *phys;
@@ -171,9 +170,10 @@ i915_gem_object_get_pages_phys(struct drm_i915_gem_object *obj)
struct scatterlist *sg;
char *vaddr;
int i;
+ int err;
if (WARN_ON(i915_gem_object_needs_bit17_swizzle(obj)))
- return ERR_PTR(-EINVAL);
+ return -EINVAL;
/* Always aligning to the object size, allows a single allocation
* to handle all possible callers, and given typical object sizes,
@@ -183,7 +183,7 @@ i915_gem_object_get_pages_phys(struct drm_i915_gem_object *obj)
roundup_pow_of_two(obj->base.size),
roundup_pow_of_two(obj->base.size));
if (!phys)
- return ERR_PTR(-ENOMEM);
+ return -ENOMEM;
vaddr = phys->vaddr;
for (i = 0; i < obj->base.size / PAGE_SIZE; i++) {
@@ -192,7 +192,7 @@ i915_gem_object_get_pages_phys(struct drm_i915_gem_object *obj)
page = shmem_read_mapping_page(mapping, i);
if (IS_ERR(page)) {
- st = ERR_CAST(page);
+ err = PTR_ERR(page);
goto err_phys;
}
@@ -209,13 +209,13 @@ i915_gem_object_get_pages_phys(struct drm_i915_gem_object *obj)
st = kmalloc(sizeof(*st), GFP_KERNEL);
if (!st) {
- st = ERR_PTR(-ENOMEM);
+ err = -ENOMEM;
goto err_phys;
}
if (sg_alloc_table(st, 1, GFP_KERNEL)) {
kfree(st);
- st = ERR_PTR(-ENOMEM);
+ err = -ENOMEM;
goto err_phys;
}
@@ -227,11 +227,15 @@ i915_gem_object_get_pages_phys(struct drm_i915_gem_object *obj)
sg_dma_len(sg) = obj->base.size;
obj->phys_handle = phys;
- return st;
+
+ __i915_gem_object_set_pages(obj, st);
+
+ return 0;
err_phys:
drm_pci_free(obj->base.dev, phys);
- return st;
+
+ return err;
}
static void __start_cpu_write(struct drm_i915_gem_object *obj)
@@ -2292,8 +2296,7 @@ static bool i915_sg_trim(struct sg_table *orig_st)
return true;
}
-static struct sg_table *
-i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj)
+static int i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj)
{
struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
const unsigned long page_count = obj->base.size / PAGE_SIZE;
@@ -2317,12 +2320,12 @@ i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj)
st = kmalloc(sizeof(*st), GFP_KERNEL);
if (st == NULL)
- return ERR_PTR(-ENOMEM);
+ return -ENOMEM;
rebuild_st:
if (sg_alloc_table(st, page_count, GFP_KERNEL)) {
kfree(st);
- return ERR_PTR(-ENOMEM);
+ return -ENOMEM;
}
/* Get the list of pages out of our struct file. They'll be pinned
@@ -2430,7 +2433,9 @@ i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj)
if (i915_gem_object_needs_bit17_swizzle(obj))
i915_gem_object_do_bit_17_swizzle(obj, st);
- return st;
+ __i915_gem_object_set_pages(obj, st);
+
+ return 0;
err_sg:
sg_mark_end(sg);
@@ -2451,7 +2456,7 @@ i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj)
if (ret == -ENOSPC)
ret = -ENOMEM;
- return ERR_PTR(ret);
+ return ret;
}
void __i915_gem_object_set_pages(struct drm_i915_gem_object *obj,
@@ -2474,19 +2479,17 @@ void __i915_gem_object_set_pages(struct drm_i915_gem_object *obj,
static int ____i915_gem_object_get_pages(struct drm_i915_gem_object *obj)
{
- struct sg_table *pages;
+ int err;
if (unlikely(obj->mm.madv != I915_MADV_WILLNEED)) {
DRM_DEBUG("Attempting to obtain a purgeable object\n");
return -EFAULT;
}
- pages = obj->ops->get_pages(obj);
- if (unlikely(IS_ERR(pages)))
- return PTR_ERR(pages);
+ err = obj->ops->get_pages(obj);
+ GEM_BUG_ON(!err && IS_ERR_OR_NULL(obj->mm.pages));
- __i915_gem_object_set_pages(obj, pages);
- return 0;
+ return err;
}
/* Ensure that the associated pages are gathered from the backing storage