011f2c26f1
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>
75 lines
2.2 KiB
Diff
75 lines
2.2 KiB
Diff
From 08d3b4a8535a142d79c30fe6a558ac8c97de11f1 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. We only need to hold
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struct_mutex for object unreferencing.
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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 | 13 ++++++-------
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1 file changed, 6 insertions(+), 7 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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@@ -439,10 +439,12 @@ fail:
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}
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static void
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-vc4_complete_exec(struct vc4_exec_info *exec)
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+vc4_complete_exec(struct drm_device *dev, struct vc4_exec_info *exec)
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{
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unsigned i;
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+ /* Need the struct lock for drm_gem_object_unreference(). */
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+ mutex_lock(&dev->struct_mutex);
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if (exec->bo) {
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for (i = 0; i < exec->bo_count; i++)
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drm_gem_object_unreference(&exec->bo[i].bo->base);
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@@ -455,6 +457,7 @@ vc4_complete_exec(struct vc4_exec_info *
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list_del(&bo->unref_head);
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drm_gem_object_unreference(&bo->base.base);
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}
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+ mutex_unlock(&dev->struct_mutex);
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kfree(exec);
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}
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@@ -473,7 +476,7 @@ vc4_job_handle_completed(struct vc4_dev
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list_del(&exec->head);
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spin_unlock_irqrestore(&vc4->job_lock, irqflags);
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- vc4_complete_exec(exec);
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+ vc4_complete_exec(vc4->dev, exec);
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spin_lock_irqsave(&vc4->job_lock, irqflags);
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}
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@@ -525,12 +528,8 @@ vc4_job_done_work(struct work_struct *wo
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{
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struct vc4_dev *vc4 =
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container_of(work, struct vc4_dev, job_done_work);
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- struct drm_device *dev = vc4->dev;
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- /* Need the struct lock for drm_gem_object_unreference(). */
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- mutex_lock(&dev->struct_mutex);
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vc4_job_handle_completed(vc4);
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- mutex_unlock(&dev->struct_mutex);
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}
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static int
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@@ -639,7 +638,7 @@ vc4_submit_cl_ioctl(struct drm_device *d
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return 0;
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fail:
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- vc4_complete_exec(exec);
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+ vc4_complete_exec(vc4->dev, exec);
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return ret;
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}
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