drm/xe/xe_res_cursor.h

65  * @cur: cursor object to initialize
71 				struct xe_res_cursor *cur)
73 	cur->sgl = NULL;
79 	cur->mem_type = res->mem_type;
81 	switch (cur->mem_type) {
106 		cur->mm = mm;
107 		cur->start = drm_buddy_block_offset(block) + start;
108 		cur->size = min(drm_buddy_block_size(mm, block) - start,
110 		cur->remaining = size;
111 		cur->node = block;
121 	cur->start = start;
122 	cur->size = size;
123 	cur->remaining = size;
124 	cur->node = NULL;
125 	cur->mem_type = XE_PL_TT;
129 static inline void __xe_res_sg_next(struct xe_res_cursor *cur)
131 	struct scatterlist *sgl = cur->sgl;
132 	u64 start = cur->start;
140 	cur->start = start;
141 	cur->size = sg_dma_len(sgl) - start;
142 	cur->sgl = sgl;
151  * @cur: cursor object to initialize
157 				   struct xe_res_cursor *cur)
162 	cur->node = NULL;
163 	cur->start = start;
164 	cur->remaining = size;
165 	cur->size = 0;
166 	cur->sgl = sg->sgl;
167 	cur->mem_type = XE_PL_TT;
168 	__xe_res_sg_next(cur);
174  * @cur: the cursor to advance
179 static inline void xe_res_next(struct xe_res_cursor *cur, u64 size)
185 	XE_WARN_ON(size > cur->remaining);
187 	cur->remaining -= size;
188 	if (!cur->remaining)
191 	if (cur->size > size) {
192 		cur->size -= size;
193 		cur->start += size;
197 	if (cur->sgl) {
198 		cur->start += size;
199 		__xe_res_sg_next(cur);
203 	switch (cur->mem_type) {
207 		start = size - cur->size;
208 		block = cur->node;
214 		while (start >= drm_buddy_block_size(cur->mm, block)) {
215 			start -= drm_buddy_block_size(cur->mm, block);
221 		cur->start = drm_buddy_block_offset(block) + start;
222 		cur->size = min(drm_buddy_block_size(cur->mm, block) - start,
223 				cur->remaining);
224 		cur->node = block;
234  * @cur: the cursor to return the dma address from
236 static inline u64 xe_res_dma(const struct xe_res_cursor *cur)
238 	return cur->sgl ? sg_dma_address(cur->sgl) + cur->start : cur->start;