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authorThomas Hellstrom <thellstrom@vmware.com>2010-11-11 09:41:57 +0100
committerDave Airlie <airlied@redhat.com>2010-11-22 13:25:22 +1000
commiteba67093f535322cb4f1c4b737319c0907a0c81d (patch)
tree695b9a43d558a2870b23d6813f60387d7d61c614 /include/drm/ttm/ttm_bo_api.h
parent65705962025df490d13df59ec57c5329d1bd0a16 (diff)
drm/ttm: Fix up io_mem_reserve / io_mem_free calling
This patch attempts to fix up shortcomings with the current calling sequences. 1) There's a fastpath where no locking occurs and only io_mem_reserved is called to obtain needed info for mapping. The fastpath is set per memory type manager. 2) If the fastpath is disabled, io_mem_reserve and io_mem_free will be exactly balanced and not called recursively for the same struct ttm_mem_reg. 3) Optionally the driver can choose to enable a per memory type manager LRU eviction mechanism that, when io_mem_reserve returns -EAGAIN will attempt to kill user-space mappings of memory in that manager to free up needed resources Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Reviewed-by: Ben Skeggs <bskeggs@redhat.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'include/drm/ttm/ttm_bo_api.h')
-rw-r--r--include/drm/ttm/ttm_bo_api.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
index edacd483c59c..50852aad260a 100644
--- a/include/drm/ttm/ttm_bo_api.h
+++ b/include/drm/ttm/ttm_bo_api.h
@@ -74,6 +74,8 @@ struct ttm_placement {
* @is_iomem: is this io memory ?
* @size: size in byte
* @offset: offset from the base address
+ * @io_reserved_vm: The VM system has a refcount in @io_reserved_count
+ * @io_reserved_count: Refcounting the numbers of callers to ttm_mem_io_reserve
*
* Structure indicating the bus placement of an object.
*/
@@ -83,7 +85,8 @@ struct ttm_bus_placement {
unsigned long size;
unsigned long offset;
bool is_iomem;
- bool io_reserved;
+ bool io_reserved_vm;
+ uint64_t io_reserved_count;
};
@@ -235,6 +238,7 @@ struct ttm_buffer_object {
struct list_head lru;
struct list_head ddestroy;
struct list_head swap;
+ struct list_head io_reserve_lru;
uint32_t val_seq;
bool seq_valid;