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authorDave Airlie <airlied@linux.ie>2009-09-15 11:12:56 +1000
committerDave Airlie <airlied@linux.ie>2009-09-16 09:15:39 +1000
commitecb114a128d150422d22eda238cb812f6b20bf39 (patch)
tree6cd09599363f9760fed8a210c576c984cbbeec18 /drivers/gpu
parent42dea5ddb56fe10e1d9a7840ddcb1df97a208a99 (diff)
drm/radeon/kms: IB locking dumps out a lockdep ordering issue
We sometimes lock IB then the ring and sometimes the ring then the IB. This is mostly due to the IB locking not being well defined about what data in the structs it actually locks. Define what I believe is the correct behaviour and gets rid of the lock dep ordering warning. Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu')
-rw-r--r--drivers/gpu/drm/radeon/r600_blit_kms.c2
-rw-r--r--drivers/gpu/drm/radeon/radeon.h4
-rw-r--r--drivers/gpu/drm/radeon/radeon_ring.c24
3 files changed, 22 insertions, 8 deletions
diff --git a/drivers/gpu/drm/radeon/r600_blit_kms.c b/drivers/gpu/drm/radeon/r600_blit_kms.c
index 1ebfd5a6dfe..4f0d181a690 100644
--- a/drivers/gpu/drm/radeon/r600_blit_kms.c
+++ b/drivers/gpu/drm/radeon/r600_blit_kms.c
@@ -538,8 +538,8 @@ int r600_vb_ib_get(struct radeon_device *rdev)
void r600_vb_ib_put(struct radeon_device *rdev)
{
- mutex_lock(&rdev->ib_pool.mutex);
radeon_fence_emit(rdev, rdev->r600_blit.vb_ib->fence);
+ mutex_lock(&rdev->ib_pool.mutex);
list_add_tail(&rdev->r600_blit.vb_ib->list, &rdev->ib_pool.scheduled_ibs);
mutex_unlock(&rdev->ib_pool.mutex);
radeon_ib_free(rdev, &rdev->r600_blit.vb_ib);
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 99292be8bc9..ff9e4171559 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -402,6 +402,10 @@ struct radeon_ib {
uint32_t length_dw;
};
+/*
+ * locking -
+ * mutex protects scheduled_ibs, ready, alloc_bm
+ */
struct radeon_ib_pool {
struct mutex mutex;
struct radeon_object *robj;
diff --git a/drivers/gpu/drm/radeon/radeon_ring.c b/drivers/gpu/drm/radeon/radeon_ring.c
index 168a555d6fb..747b4bffb84 100644
--- a/drivers/gpu/drm/radeon/radeon_ring.c
+++ b/drivers/gpu/drm/radeon/radeon_ring.c
@@ -56,10 +56,12 @@ int radeon_ib_get(struct radeon_device *rdev, struct radeon_ib **ib)
set_bit(i, rdev->ib_pool.alloc_bm);
rdev->ib_pool.ibs[i].length_dw = 0;
*ib = &rdev->ib_pool.ibs[i];
+ mutex_unlock(&rdev->ib_pool.mutex);
goto out;
}
if (list_empty(&rdev->ib_pool.scheduled_ibs)) {
/* we go do nothings here */
+ mutex_unlock(&rdev->ib_pool.mutex);
DRM_ERROR("all IB allocated none scheduled.\n");
r = -EINVAL;
goto out;
@@ -69,10 +71,13 @@ int radeon_ib_get(struct radeon_device *rdev, struct radeon_ib **ib)
struct radeon_ib, list);
if (nib->fence == NULL) {
/* we go do nothings here */
+ mutex_unlock(&rdev->ib_pool.mutex);
DRM_ERROR("IB %lu scheduled without a fence.\n", nib->idx);
r = -EINVAL;
goto out;
}
+ mutex_unlock(&rdev->ib_pool.mutex);
+
r = radeon_fence_wait(nib->fence, false);
if (r) {
DRM_ERROR("radeon: IB(%lu:0x%016lX:%u)\n", nib->idx,
@@ -81,12 +86,17 @@ int radeon_ib_get(struct radeon_device *rdev, struct radeon_ib **ib)
goto out;
}
radeon_fence_unref(&nib->fence);
+
nib->length_dw = 0;
+
+ /* scheduled list is accessed here */
+ mutex_lock(&rdev->ib_pool.mutex);
list_del(&nib->list);
INIT_LIST_HEAD(&nib->list);
+ mutex_unlock(&rdev->ib_pool.mutex);
+
*ib = nib;
out:
- mutex_unlock(&rdev->ib_pool.mutex);
if (r) {
radeon_fence_unref(&fence);
} else {
@@ -110,9 +120,10 @@ void radeon_ib_free(struct radeon_device *rdev, struct radeon_ib **ib)
return;
}
list_del(&tmp->list);
- if (tmp->fence) {
+ INIT_LIST_HEAD(&tmp->list);
+ if (tmp->fence)
radeon_fence_unref(&tmp->fence);
- }
+
tmp->length_dw = 0;
clear_bit(tmp->idx, rdev->ib_pool.alloc_bm);
mutex_unlock(&rdev->ib_pool.mutex);
@@ -122,25 +133,24 @@ int radeon_ib_schedule(struct radeon_device *rdev, struct radeon_ib *ib)
{
int r = 0;
- mutex_lock(&rdev->ib_pool.mutex);
if (!ib->length_dw || !rdev->cp.ready) {
/* TODO: Nothings in the ib we should report. */
- mutex_unlock(&rdev->ib_pool.mutex);
DRM_ERROR("radeon: couldn't schedule IB(%lu).\n", ib->idx);
return -EINVAL;
}
+
/* 64 dwords should be enough for fence too */
r = radeon_ring_lock(rdev, 64);
if (r) {
DRM_ERROR("radeon: scheduling IB failled (%d).\n", r);
- mutex_unlock(&rdev->ib_pool.mutex);
return r;
}
radeon_ring_ib_execute(rdev, ib);
radeon_fence_emit(rdev, ib->fence);
- radeon_ring_unlock_commit(rdev);
+ mutex_lock(&rdev->ib_pool.mutex);
list_add_tail(&ib->list, &rdev->ib_pool.scheduled_ibs);
mutex_unlock(&rdev->ib_pool.mutex);
+ radeon_ring_unlock_commit(rdev);
return 0;
}