C++ (Cpp) phys_to_pfn_t Examples

Example #1

/**
 * axon_ram_direct_access - direct_access() method for block device
 * @device, @sector, @data: see block_device_operations method
 */
static long
axon_ram_direct_access(struct block_device *device, sector_t sector,
		       void **kaddr, pfn_t *pfn)
{
	struct axon_ram_bank *bank = device->bd_disk->private_data;
	loff_t offset = (loff_t)sector << AXON_RAM_SECTOR_SHIFT;

	*kaddr = (void *) bank->io_addr + offset;
	*pfn = phys_to_pfn_t(bank->ph_addr + offset, PFN_DEV);
	return bank->size - offset;
}

Example #2

File: pmem-dax.c Project: sjp38/linux.doc_trans_membarrier

long pmem_direct_access(struct block_device *bdev, sector_t sector,
		void __pmem **kaddr, pfn_t *pfn, long size)
{
	struct pmem_device *pmem = bdev->bd_queue->queuedata;
	resource_size_t offset = sector * 512 + pmem->data_offset;

	if (unlikely(is_bad_pmem(&pmem->bb, sector, size)))
		return -EIO;

	/*
	 * Limit dax to a single page at a time given vmalloc()-backed
	 * in the nfit_test case.
	 */
	if (get_nfit_res(pmem->phys_addr + offset)) {
		struct page *page;

		*kaddr = pmem->virt_addr + offset;
		page = vmalloc_to_page(pmem->virt_addr + offset);
		*pfn = page_to_pfn_t(page);
		dev_dbg_ratelimited(disk_to_dev(bdev->bd_disk)->parent,
				"%s: sector: %#llx pfn: %#lx\n", __func__,
				(unsigned long long) sector, page_to_pfn(page));

		return PAGE_SIZE;
	}

	*kaddr = pmem->virt_addr + offset;
	*pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags);

	/*
	 * If badblocks are present, limit known good range to the
	 * requested range.
	 */
	if (unlikely(pmem->bb.count))
		return size;
	return pmem->size - pmem->pfn_pad - offset;
}