static int via_lock_all_dma_pages(drm_via_sg_info_t *vsg, drm_via_dmablit_t *xfer) { int ret; unsigned long first_pfn = VIA_PFN(xfer->mem_addr); vsg->num_pages = VIA_PFN(xfer->mem_addr + (xfer->num_lines * xfer->mem_stride -1)) - first_pfn + 1; if (NULL == (vsg->pages = vmalloc(sizeof(struct page *) * vsg->num_pages))) return DRM_ERR(ENOMEM); memset(vsg->pages, 0, sizeof(struct page *) * vsg->num_pages); down_read(¤t->mm->mmap_sem); ret = get_user_pages(current, current->mm, (unsigned long) xfer->mem_addr, vsg->num_pages, (vsg->direction == DMA_FROM_DEVICE), 0, vsg->pages, NULL); up_read(¤t->mm->mmap_sem); if (ret != vsg->num_pages) { if (ret < 0) return ret; vsg->state = dr_via_pages_locked; return DRM_ERR(EINVAL); } vsg->state = dr_via_pages_locked; DRM_DEBUG("DMA pages locked\n"); return 0; }
/* * Obtain a page pointer array and lock all pages into system memory. A segmentation violation will * occur here if the calling user does not have access to the submitted address. */ static int via_lock_all_dma_pages(drm_via_sg_info_t *vsg, drm_via_dmablit_t *xfer) { unsigned long first_pfn = VIA_PFN(xfer->mem_addr); vm_page_t m; int i; vsg->num_pages = VIA_PFN(xfer->mem_addr + (xfer->num_lines * xfer->mem_stride -1)) - first_pfn + 1; if (NULL == (vsg->pages = malloc(sizeof(vm_page_t) * vsg->num_pages, DRM_MEM_DRIVER, M_NOWAIT))) return -ENOMEM; vsg->state = dr_via_pages_alloc; if (vm_fault_quick_hold_pages(&curproc->p_vmspace->vm_map, (vm_offset_t)xfer->mem_addr, vsg->num_pages * PAGE_SIZE, VM_PROT_READ | VM_PROT_WRITE, vsg->pages, vsg->num_pages) < 0) return -EACCES; for (i = 0; i < vsg->num_pages; i++) { m = vsg->pages[i]; vm_page_lock(m); vm_page_wire(m); vm_page_unhold(m); vm_page_unlock(m); } vsg->state = dr_via_pages_locked; DRM_DEBUG("DMA pages locked\n"); return 0; }
static void via_map_blit_for_device(struct pci_dev *pdev, const drm_via_dmablit_t *xfer, drm_via_sg_info_t *vsg, int mode) { unsigned cur_descriptor_page = 0; unsigned num_descriptors_this_page = 0; unsigned char *mem_addr = xfer->mem_addr; unsigned char *cur_mem; unsigned char *first_addr = (unsigned char *)VIA_PGDN(mem_addr); uint32_t fb_addr = xfer->fb_addr; uint32_t cur_fb; unsigned long line_len; unsigned remaining_len; int num_desc = 0; int cur_line; dma_addr_t next = 0 | VIA_DMA_DPR_EC; drm_via_descriptor_t *desc_ptr = NULL; if (mode == 1) desc_ptr = vsg->desc_pages[cur_descriptor_page]; for (cur_line = 0; cur_line < xfer->num_lines; ++cur_line) { line_len = xfer->line_length; cur_fb = fb_addr; cur_mem = mem_addr; while (line_len > 0) { remaining_len = min(PAGE_SIZE-VIA_PGOFF(cur_mem), line_len); line_len -= remaining_len; if (mode == 1) { desc_ptr->mem_addr = dma_map_page(&pdev->dev, vsg->pages[VIA_PFN(cur_mem) - VIA_PFN(first_addr)], VIA_PGOFF(cur_mem), remaining_len, vsg->direction); desc_ptr->dev_addr = cur_fb; desc_ptr->size = remaining_len; desc_ptr->next = (uint32_t) next; next = dma_map_single(&pdev->dev, desc_ptr, sizeof(*desc_ptr), DMA_TO_DEVICE); desc_ptr++; if (++num_descriptors_this_page >= vsg->descriptors_per_page) { num_descriptors_this_page = 0; desc_ptr = vsg->desc_pages[++cur_descriptor_page]; } } num_desc++; cur_mem += remaining_len; cur_fb += remaining_len; } mem_addr += xfer->mem_stride; fb_addr += xfer->fb_stride; } if (mode == 1) { vsg->chain_start = next; vsg->state = dr_via_device_mapped; } vsg->num_desc = num_desc; }