[PATCH] drm/radeon: reject bo creation from ioctl when the gpu is disabled

[Julien Isorce]

Like done in radeon_cs_ioctl.

In particular it avoids mesa to call map/unmap:
  radeon_create_bo
    ioctl(DRM_RADEON_GEM_CREATE) -> ok
    ioctl(DRM_RADEON_GEM_VA-MAP)
  radeon_destroy_bo
    ioctl(DRM_RADEON_GEM_VA-UNMAP)

Encountered also cases where the vm_manager succeeded to be enabled after
a gpu reset while the GFX ring was not responding so accel was disabled.

https://bugs.freedesktop.org/show_bug.cgi?id=96271

Signed-off-by: Julien Isorce <jisorce at oblong.com>
---
 drivers/gpu/drm/radeon/radeon_gem.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/radeon/radeon_gem.c b/drivers/gpu/drm/radeon/radeon_gem.c
index b97c92b..1030001 100644
--- a/drivers/gpu/drm/radeon/radeon_gem.c
+++ b/drivers/gpu/drm/radeon/radeon_gem.c
@@ -259,6 +259,13 @@ int radeon_gem_create_ioctl(struct drm_device *dev, void *data,
 	int r;
 
 	down_read(&rdev->exclusive_lock);
+
+	if (!rdev->accel_working &&
+	    args->initial_domain != RADEON_GEM_DOMAIN_CPU) {
+		up_read(&rdev->exclusive_lock);
+		return -EBUSY;
+	}
+
 	/* create a gem object to contain this object in */
 	args->size = roundup(args->size, PAGE_SIZE);
 	r = radeon_gem_object_create(rdev, args->size, args->alignment,
-- 
2.7.4