lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

drm/ttm: Fix up io_mem_reserve / io_mem_free calling

Browse Source 
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>
This commit is contained in:
Thomas Hellstrom
2010-11-11 09:41:57 +01:00
committed by Dave Airlie
parent 6570596202
commit eba67093f5
5 changed files with 226 additions and 80 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
include/drm/ttm/ttm_bo_api.h
View File

@@ -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;