drm/ttm: use an operation ctx for ttm_mem_global_alloc_page

forward the operation context to ttm_mem_global_alloc_page as well,
and the ultimate goal is swapout enablement for reserved BOs.

Here reserved BOs refer to all the BOs which share same reservation object

Reviewed-by: Christian König <[e-mail]>
Signed-off-by: Roger He <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/ttm/ttm_memory.c

···
 EXPORT_SYMBOL(ttm_mem_global_alloc);
 
 int ttm_mem_global_alloc_page(struct ttm_mem_global *glob,
-			      struct page *page, uint64_t size)
+			      struct page *page, uint64_t size,
+			      struct ttm_operation_ctx *ctx)
 {
-
 	struct ttm_mem_zone *zone = NULL;
-	struct ttm_operation_ctx ctx = {
-		.interruptible = false,
-		.no_wait_gpu = false
-	};
 
 	/**
 	 * Page allocations may be registed in a single zone
···
 	if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
 		zone = glob->zone_kernel;
 #endif
-	return ttm_mem_global_alloc_zone(glob, zone, size, &ctx);
+	return ttm_mem_global_alloc_zone(glob, zone, size, ctx);
 }
 
 void ttm_mem_global_free_page(struct ttm_mem_global *glob, struct page *page,

drivers/gpu/drm/ttm/ttm_page_alloc.c

···
 int ttm_pool_populate(struct ttm_tt *ttm)
 {
 	struct ttm_mem_global *mem_glob = ttm->glob->mem_glob;
+	struct ttm_operation_ctx ctx = {
+		.interruptible = false,
+		.no_wait_gpu = false
+	};
 	unsigned i;
 	int ret;
 
···
 
 	for (i = 0; i < ttm->num_pages; ++i) {
 		ret = ttm_mem_global_alloc_page(mem_glob, ttm->pages[i],
-						PAGE_SIZE);
+						PAGE_SIZE, &ctx);
 		if (unlikely(ret != 0)) {
 			ttm_pool_unpopulate(ttm);
 			return -ENOMEM;

drivers/gpu/drm/ttm/ttm_page_alloc_dma.c

···
 {
 	struct ttm_tt *ttm = &ttm_dma->ttm;
 	struct ttm_mem_global *mem_glob = ttm->glob->mem_glob;
+	struct ttm_operation_ctx ctx = {
+		.interruptible = false,
+		.no_wait_gpu = false
+	};
 	unsigned long num_pages = ttm->num_pages;
 	struct dma_pool *pool;
 	enum pool_type type;
···
 			break;
 
 		ret = ttm_mem_global_alloc_page(mem_glob, ttm->pages[i],
-						pool->size);
+						pool->size, &ctx);
 		if (unlikely(ret != 0)) {
 			ttm_dma_unpopulate(ttm_dma, dev);
 			return -ENOMEM;
···
 		}
 
 		ret = ttm_mem_global_alloc_page(mem_glob, ttm->pages[i],
-						pool->size);
+						pool->size, &ctx);
 		if (unlikely(ret != 0)) {
 			ttm_dma_unpopulate(ttm_dma, dev);
 			return -ENOMEM;

include/drm/ttm/ttm_memory.h

···
 extern void ttm_mem_global_free(struct ttm_mem_global *glob,
 				uint64_t amount);
 extern int ttm_mem_global_alloc_page(struct ttm_mem_global *glob,
-				     struct page *page, uint64_t size);
+				     struct page *page, uint64_t size,
+				     struct ttm_operation_ctx *ctx);
 extern void ttm_mem_global_free_page(struct ttm_mem_global *glob,
 				     struct page *page, uint64_t size);
 extern size_t ttm_round_pot(size_t size);