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authorKristian Høgsberg <krh@bitplanet.net>2013-10-10 14:40:58 -0700
committerKristian Høgsberg <krh@bitplanet.net>2013-10-10 14:41:40 -0700
commit9c52c3dc4763336884277d8005eac7e6efb77600 (patch)
tree1a197243e8166926a2970d13ed21c1c3e3c80f36
parentddbbdb13d80ea7f60e6f71356a444995b905366b (diff)
intel: Set bo size from lseek if kernel supports it
The various create and open functions set the buffer size, but drm_intel_bo_gem_create_from_prime() is an exception. In the 3.12 kernel we can now use lseek on the prime fd to determine the size of the bo. Use that and override the userprovided size. If the kernel doesn't support this, we get an error and fall back to the user provided size. Signed-off-by: Kristian Høgsberg <krh@bitplanet.net>
-rw-r--r--intel/intel_bufmgr_gem.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/intel/intel_bufmgr_gem.c b/intel/intel_bufmgr_gem.c
index f98f7a72..278f5c87 100644
--- a/intel/intel_bufmgr_gem.c
+++ b/intel/intel_bufmgr_gem.c
@@ -2452,7 +2452,17 @@ drm_intel_bo_gem_create_from_prime(drm_intel_bufmgr *bufmgr, int prime_fd, int s
if (!bo_gem)
return NULL;
- bo_gem->bo.size = size;
+ /* Determine size of bo. The fd-to-handle ioctl really should
+ * return the size, but it doesn't. If we have kernel 3.12 or
+ * later, we can lseek on the prime fd to get the size. Older
+ * kernels will just fail, in which case we fall back to the
+ * provided (estimated or guess size). */
+ ret = lseek(prime_fd, 0, SEEK_END);
+ if (ret != -1)
+ bo_gem->bo.size = ret;
+ else
+ bo_gem->bo.size = size;
+
bo_gem->bo.handle = handle;
bo_gem->bo.bufmgr = bufmgr;