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authorThomas Hellstrom <thellstrom@vmware.com>2009-12-06 21:46:26 +0100
committerDave Airlie <airlied@redhat.com>2009-12-07 15:22:05 +1000
commitc078aa2fc4d8e022c3b611e07b25ff77afdf9b73 (patch)
tree60349ecc7344001b3824529be376b4677012583d /drivers/gpu/drm/ttm
parent4aff1013f5e4ae08a24155c029a2c5e1a7929de6 (diff)
downloadtalos-op-linux-c078aa2fc4d8e022c3b611e07b25ff77afdf9b73.tar.gz
talos-op-linux-c078aa2fc4d8e022c3b611e07b25ff77afdf9b73.zip
drm/ttm: Add TTM execbuf utilities.
Utilities to reserve, unreserve and fence a list of TTM buffer objects in a deadlock-safe manner. Used by the vmwgfx driver. Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/ttm')
-rw-r--r--drivers/gpu/drm/ttm/Makefile2
-rw-r--r--drivers/gpu/drm/ttm/ttm_execbuf_util.c117
2 files changed, 118 insertions, 1 deletions
diff --git a/drivers/gpu/drm/ttm/Makefile b/drivers/gpu/drm/ttm/Makefile
index 4473549bc5d2..1e138f5bae09 100644
--- a/drivers/gpu/drm/ttm/Makefile
+++ b/drivers/gpu/drm/ttm/Makefile
@@ -4,6 +4,6 @@
ccflags-y := -Iinclude/drm
ttm-y := ttm_agp_backend.o ttm_memory.o ttm_tt.o ttm_bo.o \
ttm_bo_util.o ttm_bo_vm.o ttm_module.o ttm_global.o \
- ttm_object.o ttm_lock.o
+ ttm_object.o ttm_lock.o ttm_execbuf_util.o
obj-$(CONFIG_DRM_TTM) += ttm.o
diff --git a/drivers/gpu/drm/ttm/ttm_execbuf_util.c b/drivers/gpu/drm/ttm/ttm_execbuf_util.c
new file mode 100644
index 000000000000..c285c2902d15
--- /dev/null
+++ b/drivers/gpu/drm/ttm/ttm_execbuf_util.c
@@ -0,0 +1,117 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+#include "ttm/ttm_execbuf_util.h"
+#include "ttm/ttm_bo_driver.h"
+#include "ttm/ttm_placement.h"
+#include <linux/wait.h>
+#include <linux/sched.h>
+#include <linux/module.h>
+
+void ttm_eu_backoff_reservation(struct list_head *list)
+{
+ struct ttm_validate_buffer *entry;
+
+ list_for_each_entry(entry, list, head) {
+ struct ttm_buffer_object *bo = entry->bo;
+ if (!entry->reserved)
+ continue;
+
+ entry->reserved = false;
+ ttm_bo_unreserve(bo);
+ }
+}
+EXPORT_SYMBOL(ttm_eu_backoff_reservation);
+
+/*
+ * Reserve buffers for validation.
+ *
+ * If a buffer in the list is marked for CPU access, we back off and
+ * wait for that buffer to become free for GPU access.
+ *
+ * If a buffer is reserved for another validation, the validator with
+ * the highest validation sequence backs off and waits for that buffer
+ * to become unreserved. This prevents deadlocks when validating multiple
+ * buffers in different orders.
+ */
+
+int ttm_eu_reserve_buffers(struct list_head *list, uint32_t val_seq)
+{
+ struct ttm_validate_buffer *entry;
+ int ret;
+
+retry:
+ list_for_each_entry(entry, list, head) {
+ struct ttm_buffer_object *bo = entry->bo;
+
+ entry->reserved = false;
+ ret = ttm_bo_reserve(bo, true, false, true, val_seq);
+ if (ret != 0) {
+ ttm_eu_backoff_reservation(list);
+ if (ret == -EAGAIN) {
+ ret = ttm_bo_wait_unreserved(bo, true);
+ if (unlikely(ret != 0))
+ return ret;
+ goto retry;
+ } else
+ return ret;
+ }
+
+ entry->reserved = true;
+ if (unlikely(atomic_read(&bo->cpu_writers) > 0)) {
+ ttm_eu_backoff_reservation(list);
+ ret = ttm_bo_wait_cpu(bo, false);
+ if (ret)
+ return ret;
+ goto retry;
+ }
+ }
+ return 0;
+}
+EXPORT_SYMBOL(ttm_eu_reserve_buffers);
+
+void ttm_eu_fence_buffer_objects(struct list_head *list, void *sync_obj)
+{
+ struct ttm_validate_buffer *entry;
+
+ list_for_each_entry(entry, list, head) {
+ struct ttm_buffer_object *bo = entry->bo;
+ struct ttm_bo_driver *driver = bo->bdev->driver;
+ void *old_sync_obj;
+
+ spin_lock(&bo->lock);
+ old_sync_obj = bo->sync_obj;
+ bo->sync_obj = driver->sync_obj_ref(sync_obj);
+ bo->sync_obj_arg = entry->new_sync_obj_arg;
+ spin_unlock(&bo->lock);
+ ttm_bo_unreserve(bo);
+ entry->reserved = false;
+ if (old_sync_obj)
+ driver->sync_obj_unref(&old_sync_obj);
+ }
+}
+EXPORT_SYMBOL(ttm_eu_fence_buffer_objects);
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