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