Lines Matching defs:region
27 * afu_dma_pin_pages - pin pages of given dma memory region
29 * @region: dma memory region to be pinned
35 struct dfl_afu_dma_region *region)
37 int npages = region->length >> PAGE_SHIFT;
45 region->pages = kcalloc(npages, sizeof(struct page *), GFP_KERNEL);
46 if (!region->pages) {
51 pinned = pin_user_pages_fast(region->user_addr, npages, FOLL_WRITE,
52 region->pages);
66 unpin_user_pages(region->pages, pinned);
68 kfree(region->pages);
75 * afu_dma_unpin_pages - unpin pages of given dma memory region
77 * @region: dma memory region to be unpinned
83 struct dfl_afu_dma_region *region)
85 long npages = region->length >> PAGE_SHIFT;
88 unpin_user_pages(region->pages, npages);
89 kfree(region->pages);
97 * @region: dma memory region
99 * Return true if pages of given dma memory region have continuous physical
102 static bool afu_dma_check_continuous_pages(struct dfl_afu_dma_region *region)
104 int npages = region->length >> PAGE_SHIFT;
108 if (page_to_pfn(region->pages[i]) + 1 !=
109 page_to_pfn(region->pages[i + 1]))
116 * dma_region_check_iova - check if memory area is fully contained in the region
117 * @region: dma memory region
121 * Compare the dma memory area defined by @iova and @size with given dma region.
122 * Return true if memory area is fully contained in the region, otherwise false.
124 static bool dma_region_check_iova(struct dfl_afu_dma_region *region,
127 if (!size && region->iova != iova)
130 return (region->iova <= iova) &&
131 (region->length + region->iova >= iova + size);
135 * afu_dma_region_add - add given dma region to rbtree
137 * @region: dma region to be added
139 * Return 0 for success, -EEXIST if dma region has already been added.
144 struct dfl_afu_dma_region *region)
149 dev_dbg(&pdata->dev->dev, "add region (iova = %llx)\n",
150 (unsigned long long)region->iova);
161 if (dma_region_check_iova(this, region->iova, region->length))
164 if (region->iova < this->iova)
166 else if (region->iova > this->iova)
172 rb_link_node(®ion->node, parent, new);
173 rb_insert_color(®ion->node, &afu->dma_regions);
179 * afu_dma_region_remove - remove given dma region from rbtree
181 * @region: dma region to be removed
186 struct dfl_afu_dma_region *region)
190 dev_dbg(&pdata->dev->dev, "del region (iova = %llx)\n",
191 (unsigned long long)region->iova);
194 rb_erase(®ion->node, &afu->dma_regions);
207 struct dfl_afu_dma_region *region;
210 region = container_of(node, struct dfl_afu_dma_region, node);
212 dev_dbg(&pdata->dev->dev, "del region (iova = %llx)\n",
213 (unsigned long long)region->iova);
217 if (region->iova)
219 region->iova, region->length,
222 if (region->pages)
223 afu_dma_unpin_pages(pdata, region);
226 kfree(region);
231 * afu_dma_region_find - find the dma region from rbtree based on iova and size
236 * It finds the dma region from the rbtree based on @iova and @size:
237 * - if @size == 0, it finds the dma region which starts from @iova
238 * - otherwise, it finds the dma region which fully contains
252 struct dfl_afu_dma_region *region;
254 region = container_of(node, struct dfl_afu_dma_region, node);
256 if (dma_region_check_iova(region, iova, size)) {
257 dev_dbg(dev, "find region (iova = %llx)\n",
258 (unsigned long long)region->iova);
259 return region;
262 if (iova < region->iova)
264 else if (iova > region->iova)
267 /* the iova region is not fully covered. */
271 dev_dbg(dev, "region with iova %llx and size %llx is not found\n",
278 * afu_dma_region_find_iova - find the dma region from rbtree by iova
280 * @iova: address of the dma region
291 * afu_dma_map_region - map memory region for dma
293 * @user_addr: address of the memory region
294 * @length: size of the memory region
297 * Map memory region defined by @user_addr and @length, and return dma address
298 * of the memory region via @iova.
304 struct dfl_afu_dma_region *region;
308 * Check Inputs, only accept page-aligned user memory region with
318 region = kzalloc(sizeof(*region), GFP_KERNEL);
319 if (!region)
322 region->user_addr = user_addr;
323 region->length = length;
325 /* Pin the user memory region */
326 ret = afu_dma_pin_pages(pdata, region);
328 dev_err(&pdata->dev->dev, "failed to pin memory region\n");
333 if (!afu_dma_check_continuous_pages(region)) {
340 region->iova = dma_map_page(dfl_fpga_pdata_to_parent(pdata),
341 region->pages[0], 0,
342 region->length,
344 if (dma_mapping_error(dfl_fpga_pdata_to_parent(pdata), region->iova)) {
350 *iova = region->iova;
353 ret = afu_dma_region_add(pdata, region);
356 dev_err(&pdata->dev->dev, "failed to add dma region\n");
364 region->iova, region->length, DMA_BIDIRECTIONAL);
366 afu_dma_unpin_pages(pdata, region);
368 kfree(region);
373 * afu_dma_unmap_region - unmap dma memory region
375 * @iova: dma address of the region
377 * Unmap dma memory region based on @iova.
382 struct dfl_afu_dma_region *region;
385 region = afu_dma_region_find_iova(pdata, iova);
386 if (!region) {
391 if (region->in_use) {
396 afu_dma_region_remove(pdata, region);
400 region->iova, region->length, DMA_BIDIRECTIONAL);
401 afu_dma_unpin_pages(pdata, region);
402 kfree(region);