diff options
Diffstat (limited to 'mm/hmm.c')
| -rw-r--r-- | mm/hmm.c | 147 |
1 files changed, 0 insertions, 147 deletions
@@ -691,150 +691,3 @@ long hmm_range_fault(struct hmm_range *range, unsigned int flags) return (hmm_vma_walk.last - range->start) >> PAGE_SHIFT; } EXPORT_SYMBOL(hmm_range_fault); - -/** - * hmm_range_dma_map - hmm_range_fault() and dma map page all in one. - * @range: range being faulted - * @device: device to map page to - * @daddrs: array of dma addresses for the mapped pages - * @flags: HMM_FAULT_* - * - * Return: the number of pages mapped on success (including zero), or any - * status return from hmm_range_fault() otherwise. - */ -long hmm_range_dma_map(struct hmm_range *range, struct device *device, - dma_addr_t *daddrs, unsigned int flags) -{ - unsigned long i, npages, mapped; - long ret; - - ret = hmm_range_fault(range, flags); - if (ret <= 0) - return ret ? ret : -EBUSY; - - npages = (range->end - range->start) >> PAGE_SHIFT; - for (i = 0, mapped = 0; i < npages; ++i) { - enum dma_data_direction dir = DMA_TO_DEVICE; - struct page *page; - - /* - * FIXME need to update DMA API to provide invalid DMA address - * value instead of a function to test dma address value. This - * would remove lot of dumb code duplicated accross many arch. - * - * For now setting it to 0 here is good enough as the pfns[] - * value is what is use to check what is valid and what isn't. - */ - daddrs[i] = 0; - - page = hmm_device_entry_to_page(range, range->pfns[i]); - if (page == NULL) - continue; - - /* Check if range is being invalidated */ - if (mmu_interval_check_retry(range->notifier, - range->notifier_seq)) { - ret = -EBUSY; - goto unmap; - } - - /* If it is read and write than map bi-directional. */ - if (range->pfns[i] & range->flags[HMM_PFN_WRITE]) - dir = DMA_BIDIRECTIONAL; - - daddrs[i] = dma_map_page(device, page, 0, PAGE_SIZE, dir); - if (dma_mapping_error(device, daddrs[i])) { - ret = -EFAULT; - goto unmap; - } - - mapped++; - } - - return mapped; - -unmap: - for (npages = i, i = 0; (i < npages) && mapped; ++i) { - enum dma_data_direction dir = DMA_TO_DEVICE; - struct page *page; - - page = hmm_device_entry_to_page(range, range->pfns[i]); - if (page == NULL) - continue; - - if (dma_mapping_error(device, daddrs[i])) - continue; - - /* If it is read and write than map bi-directional. */ - if (range->pfns[i] & range->flags[HMM_PFN_WRITE]) - dir = DMA_BIDIRECTIONAL; - - dma_unmap_page(device, daddrs[i], PAGE_SIZE, dir); - mapped--; - } - - return ret; -} -EXPORT_SYMBOL(hmm_range_dma_map); - -/** - * hmm_range_dma_unmap() - unmap range of that was map with hmm_range_dma_map() - * @range: range being unmapped - * @device: device against which dma map was done - * @daddrs: dma address of mapped pages - * @dirty: dirty page if it had the write flag set - * Return: number of page unmapped on success, -EINVAL otherwise - * - * Note that caller MUST abide by mmu notifier or use HMM mirror and abide - * to the sync_cpu_device_pagetables() callback so that it is safe here to - * call set_page_dirty(). Caller must also take appropriate locks to avoid - * concurrent mmu notifier or sync_cpu_device_pagetables() to make progress. - */ -long hmm_range_dma_unmap(struct hmm_range *range, - struct device *device, - dma_addr_t *daddrs, - bool dirty) -{ - unsigned long i, npages; - long cpages = 0; - - /* Sanity check. */ - if (range->end <= range->start) - return -EINVAL; - if (!daddrs) - return -EINVAL; - if (!range->pfns) - return -EINVAL; - - npages = (range->end - range->start) >> PAGE_SHIFT; - for (i = 0; i < npages; ++i) { - enum dma_data_direction dir = DMA_TO_DEVICE; - struct page *page; - - page = hmm_device_entry_to_page(range, range->pfns[i]); - if (page == NULL) - continue; - - /* If it is read and write than map bi-directional. */ - if (range->pfns[i] & range->flags[HMM_PFN_WRITE]) { - dir = DMA_BIDIRECTIONAL; - - /* - * See comments in function description on why it is - * safe here to call set_page_dirty() - */ - if (dirty) - set_page_dirty(page); - } - - /* Unmap and clear pfns/dma address */ - dma_unmap_page(device, daddrs[i], PAGE_SIZE, dir); - range->pfns[i] = range->values[HMM_PFN_NONE]; - /* FIXME see comments in hmm_vma_dma_map() */ - daddrs[i] = 0; - cpages++; - } - - return cpages; -} -EXPORT_SYMBOL(hmm_range_dma_unmap); |