diff options
| author | Jerome Glisse <jglisse@redhat.com> | 2012-07-02 20:45:19 +0400 |
|---|---|---|
| committer | Christian König <deathsimple@vodafone.de> | 2012-07-17 12:32:02 +0400 |
| commit | dee53e7fb3ee01b83c75a8e8df8c444049d38058 (patch) | |
| tree | f9f0a669b4949f9d215759bcbd8f79a08ca1bdfa /drivers/gpu/drm/radeon/radeon_cs.c | |
| parent | 93bf888c5c730605e3470f5d2381f296eda88d79 (diff) | |
| download | linux-dee53e7fb3ee01b83c75a8e8df8c444049d38058.tar.xz | |
drm/radeon: add an exclusive lock for GPU reset v2
GPU reset need to be exclusive, one happening at a time. For this
add a rw semaphore so that any path that trigger GPU activities
have to take the semaphore as a reader thus allowing concurency.
The GPU reset path take the semaphore as a writer ensuring that
no concurrent reset take place.
v2: init rw semaphore
Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/radeon/radeon_cs.c')
| -rw-r--r-- | drivers/gpu/drm/radeon/radeon_cs.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_cs.c b/drivers/gpu/drm/radeon/radeon_cs.c index d5aec095d358..553da67a4cdd 100644 --- a/drivers/gpu/drm/radeon/radeon_cs.c +++ b/drivers/gpu/drm/radeon/radeon_cs.c @@ -499,7 +499,9 @@ int radeon_cs_ioctl(struct drm_device *dev, void *data, struct drm_file *filp) struct radeon_cs_parser parser; int r; + down_read(&rdev->exclusive_lock); if (!rdev->accel_working) { + up_read(&rdev->exclusive_lock); return -EBUSY; } /* initialize parser */ @@ -512,6 +514,7 @@ int radeon_cs_ioctl(struct drm_device *dev, void *data, struct drm_file *filp) if (r) { DRM_ERROR("Failed to initialize parser !\n"); radeon_cs_parser_fini(&parser, r); + up_read(&rdev->exclusive_lock); r = radeon_cs_handle_lockup(rdev, r); return r; } @@ -520,6 +523,7 @@ int radeon_cs_ioctl(struct drm_device *dev, void *data, struct drm_file *filp) if (r != -ERESTARTSYS) DRM_ERROR("Failed to parse relocation %d!\n", r); radeon_cs_parser_fini(&parser, r); + up_read(&rdev->exclusive_lock); r = radeon_cs_handle_lockup(rdev, r); return r; } @@ -533,6 +537,7 @@ int radeon_cs_ioctl(struct drm_device *dev, void *data, struct drm_file *filp) } out: radeon_cs_parser_fini(&parser, r); + up_read(&rdev->exclusive_lock); r = radeon_cs_handle_lockup(rdev, r); return r; } |