diff options
Diffstat (limited to 'kernels/linux-libre-xen/0001-drm-i915-Disallow-pin-ioctl-completely-for-kms-drive.patch')
| -rw-r--r-- | kernels/linux-libre-xen/0001-drm-i915-Disallow-pin-ioctl-completely-for-kms-drive.patch | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/kernels/linux-libre-xen/0001-drm-i915-Disallow-pin-ioctl-completely-for-kms-drive.patch b/kernels/linux-libre-xen/0001-drm-i915-Disallow-pin-ioctl-completely-for-kms-drive.patch new file mode 100644 index 000000000..f9aa99342 --- /dev/null +++ b/kernels/linux-libre-xen/0001-drm-i915-Disallow-pin-ioctl-completely-for-kms-drive.patch @@ -0,0 +1,79 @@ +From d472fcc8379c062bd56a3876fc6ef22258f14a91 Mon Sep 17 00:00:00 2001 +From: Daniel Vetter <daniel.vetter@ffwll.ch> +Date: Mon, 24 Nov 2014 11:12:42 +0100 +Subject: [PATCH] drm/i915: Disallow pin ioctl completely for kms drivers + +The problem here is that SNA pins batchbuffers to etch out a bit more +performance. Iirc it started out as a w/a for i830M (which we've +implemented in the kernel since a long time already). The problem is +that the pin ioctl wasn't added in + +commit d23db88c3ab233daed18709e3a24d6c95344117f +Author: Chris Wilson <chris@chris-wilson.co.uk> +Date: Fri May 23 08:48:08 2014 +0200 + + drm/i915: Prevent negative relocation deltas from wrapping + +Fix this by simply disallowing pinning from userspace so that the +kernel is in full control of batch placement again. Especially since +distros are moving towards running X as non-root, so most users won't +even be able to see any benefits. + +UMS support is dead now, but we need this minimal patch for +backporting. Follow-up patch will remove the pin ioctl code +completely. + +Note to backporters: You must have both + +commit b45305fce5bb1abec263fcff9d81ebecd6306ede +Author: Daniel Vetter <daniel.vetter@ffwll.ch> +Date: Mon Dec 17 16:21:27 2012 +0100 + + drm/i915: Implement workaround for broken CS tlb on i830/845 + +which laned in 3.8 and + +commit c4d69da167fa967749aeb70bc0e94a457e5d00c1 +Author: Chris Wilson <chris@chris-wilson.co.uk> +Date: Mon Sep 8 14:25:41 2014 +0100 + + drm/i915: Evict CS TLBs between batches + +which is also marked cc: stable. Otherwise this could introduce a +regression by disabling the userspace w/a without the kernel w/a being +fully functional on i830/45. + +References: https://bugs.freedesktop.org/show_bug.cgi?id=76554#c116 +Cc: stable@vger.kernel.org # requires c4d69da167fa967749a and v3.8 +Cc: Chris Wilson <chris@chris-wilson.co.uk> +Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> +--- + drivers/gpu/drm/i915/i915_gem.c | 5 ++++- + 1 file changed, 4 insertions(+), 1 deletion(-) + +diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c +index fd17cca..97b86a5 100644 +--- a/drivers/gpu/drm/i915/i915_gem.c ++++ b/drivers/gpu/drm/i915/i915_gem.c +@@ -4263,7 +4263,7 @@ i915_gem_pin_ioctl(struct drm_device *dev, void *data, + struct drm_i915_gem_object *obj; + int ret; + +- if (INTEL_INFO(dev)->gen >= 6) ++ if (drm_core_check_feature(dev, DRIVER_MODESET)) + return -ENODEV; + + ret = i915_mutex_lock_interruptible(dev); +@@ -4319,6 +4319,9 @@ i915_gem_unpin_ioctl(struct drm_device *dev, void *data, + struct drm_i915_gem_object *obj; + int ret; + ++ if (drm_core_check_feature(dev, DRIVER_MODESET)) ++ return -ENODEV; ++ + ret = i915_mutex_lock_interruptible(dev); + if (ret) + return ret; +-- +2.2.0 + |