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drm/vmwgfx: Use a validation context allocator for relocations and validations

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A common trait of these objects are that they are allocated during the
command validation phase and freed after command submission. Furthermore
they are accessed by a single thread only. So provide a simple unprotected
stack-like allocator from which these objects can be allocated. Their
memory is freed with the validation context when the command submission
is done.

Note that the mm subsystem maintains a per-cpu cache of single pages to
make single page allocation and freeing efficient.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>
This commit is contained in:
Thomas Hellstrom
2018-09-26 15:36:52 +02:00
parent 2724b2d54c
commit fc18afcf5f
4 changed files with 132 additions and 64 deletions
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12
drivers/gpu/drm/vmwgfx/vmwgfx_validation.h
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@@ -40,19 +40,25 @@
* @resource_ctx_list: List head for resource validation metadata for
* resources that need to be validated before those in @resource_list
* @bo_list: List head for buffer objects
* @page_list: List of pages used by the memory allocator
* @ticket: Ticked used for ww mutex locking
* @res_mutex: Pointer to mutex used for resource reserving
* @merge_dups: Whether to merge metadata for duplicate resources or
* buffer objects
* @mem_size_left: Free memory left in the last page in @page_list
* @page_address: Kernel virtual address of the last page in @page_list
*/
struct vmw_validation_context {
struct drm_open_hash *ht;
struct list_head resource_list;
struct list_head resource_ctx_list;
struct list_head bo_list;
struct list_head page_list;
struct ww_acquire_ctx ticket;
struct mutex *res_mutex;
unsigned int merge_dups;
unsigned int mem_size_left;
u8 *page_address;
};
struct vmw_buffer_object;
@@ -76,8 +82,10 @@ struct vmw_fence_obj;
.resource_list = LIST_HEAD_INIT((_name).resource_list), \
.resource_ctx_list = LIST_HEAD_INIT((_name).resource_ctx_list), \
.bo_list = LIST_HEAD_INIT((_name).bo_list), \
.page_list = LIST_HEAD_INIT((_name).page_list), \
.res_mutex = NULL, \
.merge_dups = _merge_dups, \
.res_mutex = NULL \
.mem_size_left = 0, \
}
/**
@@ -199,4 +207,6 @@ void vmw_validation_revert(struct vmw_validation_context *ctx);
void vmw_validation_done(struct vmw_validation_context *ctx,
struct vmw_fence_obj *fence);
void *vmw_validation_mem_alloc(struct vmw_validation_context *ctx, size_t size);
#endif