diff options
| author | Maarten Lankhorst <maarten.lankhorst@linux.intel.com> | 2021-03-23 16:50:52 +0100 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2021-03-24 17:59:37 +0100 |
| commit | 5b0a78ec0b5738046ab170e67cc28491cbee3f3f (patch) | |
| tree | ea4a8045daffb3301e2b55284d2fea24740bda86 /drivers/gpu/drm/i915/gt/intel_reset.c | |
| parent | fd995a3cc432da2d18c28c2731f41da9b751897b (diff) | |
| download | linux-5b0a78ec0b5738046ab170e67cc28491cbee3f3f.tar.gz | |
drm/i915: Move gt_revoke() slightly
We get a lockdep splat when the reset mutex is held, because it can be
taken from fence_wait. This conflicts with the mmu notifier we have,
because we recurse between reset mutex and mmap lock -> mmu notifier.
Remove this recursion by calling revoke_mmaps before taking the lock.
The reset code still needs fixing, as taking mmap locks during reset
is not allowed.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
[danvet: Add FIXME.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210323155059.628690-64-maarten.lankhorst@linux.intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/gt/intel_reset.c')
| -rw-r--r-- | drivers/gpu/drm/i915/gt/intel_reset.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/gt/intel_reset.c b/drivers/gpu/drm/i915/gt/intel_reset.c index afe0342dcd47..c20fba1abc74 100644 --- a/drivers/gpu/drm/i915/gt/intel_reset.c +++ b/drivers/gpu/drm/i915/gt/intel_reset.c @@ -974,8 +974,6 @@ static int do_reset(struct intel_gt *gt, intel_engine_mask_t stalled_mask) { int err, i; - gt_revoke(gt); - err = __intel_gt_reset(gt, ALL_ENGINES); for (i = 0; err && i < RESET_MAX_RETRIES; i++) { msleep(10 * (i + 1)); @@ -1030,6 +1028,13 @@ void intel_gt_reset(struct intel_gt *gt, might_sleep(); GEM_BUG_ON(!test_bit(I915_RESET_BACKOFF, >->reset.flags)); + + /* + * FIXME: Revoking cpu mmap ptes cannot be done from a dma_fence + * critical section like gpu reset. + */ + gt_revoke(gt); + mutex_lock(>->reset.mutex); /* Clear any previous failed attempts at recovery. Time to try again. */ |