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drm/i915: pwrite/pread do not require obj->base.filp, just pages

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The idea behind relaxing the restriction for pread/pwrite was to handle
!obj->base.flip, i.e. non-shmemfs backed objects, which only requires
that the object provide struct pages.

v2: Remove excess (). Note enough editing after copy'n'paste.
v3: Use new i915_gem_object_has_struct_page()

Testcase: igt/prime_vgem/read
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Ankitprasad Sharma <ankitprasad.r.sharma@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1466431552-17860-2-git-send-email-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2016-06-20 15:05:52 +01:00
parent b9bcd14a2b
commit 6eae0059f9
1 changed files with 4 additions and 3 deletions
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7
drivers/gpu/drm/i915/i915_gem.c
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@ -760,7 +760,7 @@ i915_gem_shmem_pread(struct drm_device *dev,
int needs_clflush = 0;
struct sg_page_iter sg_iter;
if (!obj->base.filp)
if (!i915_gem_object_has_struct_page(obj))
return -ENODEV;
user_data = u64_to_user_ptr(args->data_ptr);
@ -1298,7 +1298,8 @@ i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
* pread/pwrite currently are reading and writing from the CPU
* perspective, requiring manual detiling by the client.
*/
if (!obj->base.filp || cpu_write_needs_clflush(obj)) {
if (!i915_gem_object_has_struct_page(obj) ||
cpu_write_needs_clflush(obj)) {
ret = i915_gem_gtt_pwrite_fast(dev_priv, obj, args, file);
/* Note that the gtt paths might fail with non-page-backed user
* pointers (e.g. gtt mappings when moving data between
@ -1308,7 +1309,7 @@ i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
if (ret == -EFAULT) {
if (obj->phys_handle)
ret = i915_gem_phys_pwrite(obj, args, file);
else if (obj->base.filp)
else if (i915_gem_object_has_struct_page(obj))
ret = i915_gem_shmem_pwrite(dev, obj, args, file);
else
ret = -ENODEV;