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![Ingo Molnar](/assets/img/avatar_default.png)
Fix: drivers/block/pmem.c: In function ‘pmem_alloc’: drivers/block/pmem.c:138:7: warning: format ‘%llx’ expects argument of type ‘long long unsigned int’, but argument 3 has type ‘phys_addr_t’ [-Wformat=] By using the proper %pa format specifier we use for 'phys_addr_t' arguments. Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Boaz Harrosh <boaz@plexistor.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Christoph Hellwig <hch@lst.de> Cc: Dan Williams <dan.j.williams@intel.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Jens Axboe <axboe@fb.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Keith Busch <keith.busch@intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Matthew Wilcox <willy@linux.intel.com> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-nvdimm@ml01.01.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
262 lines
6 KiB
C
262 lines
6 KiB
C
/*
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* Persistent Memory Driver
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*
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* Copyright (c) 2014, Intel Corporation.
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* Copyright (c) 2015, Christoph Hellwig <hch@lst.de>.
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* Copyright (c) 2015, Boaz Harrosh <boaz@plexistor.com>.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <asm/cacheflush.h>
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#include <linux/blkdev.h>
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#include <linux/hdreg.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/slab.h>
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#define PMEM_MINORS 16
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struct pmem_device {
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struct request_queue *pmem_queue;
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struct gendisk *pmem_disk;
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/* One contiguous memory region per device */
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phys_addr_t phys_addr;
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void *virt_addr;
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size_t size;
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};
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static int pmem_major;
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static atomic_t pmem_index;
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static void pmem_do_bvec(struct pmem_device *pmem, struct page *page,
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unsigned int len, unsigned int off, int rw,
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sector_t sector)
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{
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void *mem = kmap_atomic(page);
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size_t pmem_off = sector << 9;
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if (rw == READ) {
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memcpy(mem + off, pmem->virt_addr + pmem_off, len);
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flush_dcache_page(page);
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} else {
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flush_dcache_page(page);
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memcpy(pmem->virt_addr + pmem_off, mem + off, len);
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}
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kunmap_atomic(mem);
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}
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static void pmem_make_request(struct request_queue *q, struct bio *bio)
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{
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struct block_device *bdev = bio->bi_bdev;
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struct pmem_device *pmem = bdev->bd_disk->private_data;
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int rw;
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struct bio_vec bvec;
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sector_t sector;
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struct bvec_iter iter;
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int err = 0;
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if (bio_end_sector(bio) > get_capacity(bdev->bd_disk)) {
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err = -EIO;
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goto out;
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}
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BUG_ON(bio->bi_rw & REQ_DISCARD);
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rw = bio_data_dir(bio);
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sector = bio->bi_iter.bi_sector;
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bio_for_each_segment(bvec, bio, iter) {
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pmem_do_bvec(pmem, bvec.bv_page, bvec.bv_len, bvec.bv_offset,
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rw, sector);
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sector += bvec.bv_len >> 9;
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}
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out:
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bio_endio(bio, err);
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}
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static int pmem_rw_page(struct block_device *bdev, sector_t sector,
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struct page *page, int rw)
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{
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struct pmem_device *pmem = bdev->bd_disk->private_data;
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pmem_do_bvec(pmem, page, PAGE_CACHE_SIZE, 0, rw, sector);
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page_endio(page, rw & WRITE, 0);
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return 0;
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}
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static long pmem_direct_access(struct block_device *bdev, sector_t sector,
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void **kaddr, unsigned long *pfn, long size)
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{
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struct pmem_device *pmem = bdev->bd_disk->private_data;
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size_t offset = sector << 9;
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if (!pmem)
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return -ENODEV;
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*kaddr = pmem->virt_addr + offset;
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*pfn = (pmem->phys_addr + offset) >> PAGE_SHIFT;
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return pmem->size - offset;
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}
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static const struct block_device_operations pmem_fops = {
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.owner = THIS_MODULE,
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.rw_page = pmem_rw_page,
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.direct_access = pmem_direct_access,
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};
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static struct pmem_device *pmem_alloc(struct device *dev, struct resource *res)
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{
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struct pmem_device *pmem;
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struct gendisk *disk;
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int idx, err;
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err = -ENOMEM;
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pmem = kzalloc(sizeof(*pmem), GFP_KERNEL);
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if (!pmem)
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goto out;
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pmem->phys_addr = res->start;
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pmem->size = resource_size(res);
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err = -EINVAL;
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if (!request_mem_region(pmem->phys_addr, pmem->size, "pmem")) {
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dev_warn(dev, "could not reserve region [0x%pa:0x%zx]\n", &pmem->phys_addr, pmem->size);
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goto out_free_dev;
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}
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/*
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* Map the memory as non-cachable, as we can't write back the contents
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* of the CPU caches in case of a crash.
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*/
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err = -ENOMEM;
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pmem->virt_addr = ioremap_nocache(pmem->phys_addr, pmem->size);
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if (!pmem->virt_addr)
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goto out_release_region;
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pmem->pmem_queue = blk_alloc_queue(GFP_KERNEL);
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if (!pmem->pmem_queue)
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goto out_unmap;
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blk_queue_make_request(pmem->pmem_queue, pmem_make_request);
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blk_queue_max_hw_sectors(pmem->pmem_queue, 1024);
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blk_queue_bounce_limit(pmem->pmem_queue, BLK_BOUNCE_ANY);
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disk = alloc_disk(PMEM_MINORS);
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if (!disk)
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goto out_free_queue;
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idx = atomic_inc_return(&pmem_index) - 1;
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disk->major = pmem_major;
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disk->first_minor = PMEM_MINORS * idx;
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disk->fops = &pmem_fops;
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disk->private_data = pmem;
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disk->queue = pmem->pmem_queue;
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disk->flags = GENHD_FL_EXT_DEVT;
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sprintf(disk->disk_name, "pmem%d", idx);
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disk->driverfs_dev = dev;
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set_capacity(disk, pmem->size >> 9);
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pmem->pmem_disk = disk;
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add_disk(disk);
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return pmem;
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out_free_queue:
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blk_cleanup_queue(pmem->pmem_queue);
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out_unmap:
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iounmap(pmem->virt_addr);
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out_release_region:
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release_mem_region(pmem->phys_addr, pmem->size);
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out_free_dev:
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kfree(pmem);
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out:
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return ERR_PTR(err);
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}
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static void pmem_free(struct pmem_device *pmem)
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{
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del_gendisk(pmem->pmem_disk);
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put_disk(pmem->pmem_disk);
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blk_cleanup_queue(pmem->pmem_queue);
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iounmap(pmem->virt_addr);
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release_mem_region(pmem->phys_addr, pmem->size);
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kfree(pmem);
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}
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static int pmem_probe(struct platform_device *pdev)
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{
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struct pmem_device *pmem;
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struct resource *res;
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if (WARN_ON(pdev->num_resources > 1))
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return -ENXIO;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res)
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return -ENXIO;
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pmem = pmem_alloc(&pdev->dev, res);
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if (IS_ERR(pmem))
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return PTR_ERR(pmem);
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platform_set_drvdata(pdev, pmem);
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return 0;
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}
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static int pmem_remove(struct platform_device *pdev)
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{
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struct pmem_device *pmem = platform_get_drvdata(pdev);
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pmem_free(pmem);
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return 0;
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}
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static struct platform_driver pmem_driver = {
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.probe = pmem_probe,
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.remove = pmem_remove,
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.driver = {
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.owner = THIS_MODULE,
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.name = "pmem",
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},
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};
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static int __init pmem_init(void)
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{
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int error;
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pmem_major = register_blkdev(0, "pmem");
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if (pmem_major < 0)
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return pmem_major;
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error = platform_driver_register(&pmem_driver);
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if (error)
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unregister_blkdev(pmem_major, "pmem");
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return error;
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}
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module_init(pmem_init);
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static void pmem_exit(void)
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{
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platform_driver_unregister(&pmem_driver);
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unregister_blkdev(pmem_major, "pmem");
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}
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module_exit(pmem_exit);
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MODULE_AUTHOR("Ross Zwisler <ross.zwisler@linux.intel.com>");
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MODULE_LICENSE("GPL v2");
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