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As usual these patches were extracted and rebased from the raspberry pi repo: https://github.com/raspberrypi/linux/tree/rpi-4.4.y Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
64 lines
1.8 KiB
Diff
64 lines
1.8 KiB
Diff
From 775a3408d94a474101066ac8dd8939a4cd5c793a Mon Sep 17 00:00:00 2001
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From: Eric Anholt <eric@anholt.net>
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Date: Mon, 19 Oct 2015 08:44:35 -0700
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Subject: [PATCH] drm/vc4: Drop struct_mutex around CL validation.
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We were using it so that we could make sure that shader validation
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state didn't change while we were validating, but now shader
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validation state is immutable. The bcl/rcl generation doesn't do any
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other BO dereferencing, and seems to have no other global state
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dependency not covered by job_lock / bo_lock.
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Fixes a lock order reversal between mmap_sem and struct_mutex.
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Signed-off-by: Eric Anholt <eric@anholt.net>
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---
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drivers/gpu/drm/vc4/vc4_gem.c | 12 ++++--------
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1 file changed, 4 insertions(+), 8 deletions(-)
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--- a/drivers/gpu/drm/vc4/vc4_gem.c
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+++ b/drivers/gpu/drm/vc4/vc4_gem.c
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@@ -244,13 +244,15 @@ static void
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vc4_queue_submit(struct drm_device *dev, struct vc4_exec_info *exec)
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{
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struct vc4_dev *vc4 = to_vc4_dev(dev);
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- uint64_t seqno = ++vc4->emit_seqno;
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+ uint64_t seqno;
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unsigned long irqflags;
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+ spin_lock_irqsave(&vc4->job_lock, irqflags);
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+
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+ seqno = ++vc4->emit_seqno;
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exec->seqno = seqno;
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vc4_update_bo_seqnos(exec, seqno);
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- spin_lock_irqsave(&vc4->job_lock, irqflags);
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list_add_tail(&exec->head, &vc4->job_list);
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/* If no job was executing, kick ours off. Otherwise, it'll
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@@ -608,8 +610,6 @@ vc4_submit_cl_ioctl(struct drm_device *d
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exec->args = args;
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INIT_LIST_HEAD(&exec->unref_list);
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- mutex_lock(&dev->struct_mutex);
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-
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ret = vc4_cl_lookup_bos(dev, file_priv, exec);
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if (ret)
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goto fail;
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@@ -636,15 +636,11 @@ vc4_submit_cl_ioctl(struct drm_device *d
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/* Return the seqno for our job. */
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args->seqno = vc4->emit_seqno;
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- mutex_unlock(&dev->struct_mutex);
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-
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return 0;
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fail:
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vc4_complete_exec(exec);
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- mutex_unlock(&dev->struct_mutex);
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-
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return ret;
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}
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