From 9c52c3dc4763336884277d8005eac7e6efb77600 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Kristian=20H=C3=B8gsberg?= Date: Thu, 10 Oct 2013 14:40:58 -0700 Subject: [PATCH] intel: Set bo size from lseek if kernel supports it MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 --- intel/intel_bufmgr_gem.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) 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;