From 7a2765f6e82063f348ebce78c28eceff741689d4 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Thu, 26 Jan 2017 13:54:35 -0800 Subject: dcssblk: add dax_operations support Setup a dax_dev to have the same lifetime as the dcssblk block device and add a ->direct_access() method that is equivalent to dcssblk_direct_access(). Once fs/dax.c has been converted to use dax_operations the old dcssblk_direct_access() will be removed. Reported-by: Gerald Schaefer Acked-by: Gerald Schaefer Signed-off-by: Dan Williams --- drivers/s390/block/Kconfig | 1 + drivers/s390/block/dcssblk.c | 55 ++++++++++++++++++++++++++++++++++++-------- 2 files changed, 47 insertions(+), 9 deletions(-) (limited to 'drivers/s390') diff --git a/drivers/s390/block/Kconfig b/drivers/s390/block/Kconfig index 4a3b62326183..0acb8c2f9475 100644 --- a/drivers/s390/block/Kconfig +++ b/drivers/s390/block/Kconfig @@ -14,6 +14,7 @@ config BLK_DEV_XPRAM config DCSSBLK def_tristate m + select DAX prompt "DCSSBLK support" depends on S390 && BLOCK help diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c index 415d10a67b7a..dc84cfd4e438 100644 --- a/drivers/s390/block/dcssblk.c +++ b/drivers/s390/block/dcssblk.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include @@ -30,8 +31,10 @@ static int dcssblk_open(struct block_device *bdev, fmode_t mode); static void dcssblk_release(struct gendisk *disk, fmode_t mode); static blk_qc_t dcssblk_make_request(struct request_queue *q, struct bio *bio); -static long dcssblk_direct_access(struct block_device *bdev, sector_t secnum, +static long dcssblk_blk_direct_access(struct block_device *bdev, sector_t secnum, void **kaddr, pfn_t *pfn, long size); +static long dcssblk_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, + long nr_pages, void **kaddr, pfn_t *pfn); static char dcssblk_segments[DCSSBLK_PARM_LEN] = "\0"; @@ -40,7 +43,11 @@ static const struct block_device_operations dcssblk_devops = { .owner = THIS_MODULE, .open = dcssblk_open, .release = dcssblk_release, - .direct_access = dcssblk_direct_access, + .direct_access = dcssblk_blk_direct_access, +}; + +static const struct dax_operations dcssblk_dax_ops = { + .direct_access = dcssblk_dax_direct_access, }; struct dcssblk_dev_info { @@ -57,6 +64,7 @@ struct dcssblk_dev_info { struct request_queue *dcssblk_queue; int num_of_segments; struct list_head seg_list; + struct dax_device *dax_dev; }; struct segment_info { @@ -389,6 +397,8 @@ removeseg: } list_del(&dev_info->lh); + kill_dax(dev_info->dax_dev); + put_dax(dev_info->dax_dev); del_gendisk(dev_info->gd); blk_cleanup_queue(dev_info->dcssblk_queue); dev_info->gd->queue = NULL; @@ -654,6 +664,13 @@ dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char if (rc) goto put_dev; + dev_info->dax_dev = alloc_dax(dev_info, dev_info->gd->disk_name, + &dcssblk_dax_ops); + if (!dev_info->dax_dev) { + rc = -ENOMEM; + goto put_dev; + } + get_device(&dev_info->dev); device_add_disk(&dev_info->dev, dev_info->gd); @@ -752,6 +769,8 @@ dcssblk_remove_store(struct device *dev, struct device_attribute *attr, const ch } list_del(&dev_info->lh); + kill_dax(dev_info->dax_dev); + put_dax(dev_info->dax_dev); del_gendisk(dev_info->gd); blk_cleanup_queue(dev_info->dcssblk_queue); dev_info->gd->queue = NULL; @@ -883,21 +902,39 @@ fail: } static long -dcssblk_direct_access (struct block_device *bdev, sector_t secnum, +__dcssblk_direct_access(struct dcssblk_dev_info *dev_info, pgoff_t pgoff, + long nr_pages, void **kaddr, pfn_t *pfn) +{ + resource_size_t offset = pgoff * PAGE_SIZE; + unsigned long dev_sz; + + dev_sz = dev_info->end - dev_info->start + 1; + *kaddr = (void *) dev_info->start + offset; + *pfn = __pfn_to_pfn_t(PFN_DOWN(dev_info->start + offset), PFN_DEV); + + return (dev_sz - offset) / PAGE_SIZE; +} + +static long +dcssblk_blk_direct_access(struct block_device *bdev, sector_t secnum, void **kaddr, pfn_t *pfn, long size) { struct dcssblk_dev_info *dev_info; - unsigned long offset, dev_sz; dev_info = bdev->bd_disk->private_data; if (!dev_info) return -ENODEV; - dev_sz = dev_info->end - dev_info->start + 1; - offset = secnum * 512; - *kaddr = (void *) dev_info->start + offset; - *pfn = __pfn_to_pfn_t(PFN_DOWN(dev_info->start + offset), PFN_DEV); + return __dcssblk_direct_access(dev_info, PHYS_PFN(secnum * 512), + PHYS_PFN(size), kaddr, pfn) * PAGE_SIZE; +} + +static long +dcssblk_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, + long nr_pages, void **kaddr, pfn_t *pfn) +{ + struct dcssblk_dev_info *dev_info = dax_get_private(dax_dev); - return dev_sz - offset; + return __dcssblk_direct_access(dev_info, pgoff, nr_pages, kaddr, pfn); } static void -- cgit v1.2.3 From d4b29fd78ea6fc2be219be3af1a992149b4ff0f6 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Fri, 27 Jan 2017 17:22:03 -0800 Subject: block: remove block_device_operations ->direct_access() Now that all the producers and consumers of dax interfaces have been converted to using dax_operations on a dax_device, remove the block device direct_access enabling. Signed-off-by: Dan Williams --- arch/powerpc/sysdev/axonram.c | 23 ++++------------------ drivers/block/brd.c | 15 --------------- drivers/md/dm.c | 13 ------------- drivers/nvdimm/pmem.c | 10 ---------- drivers/s390/block/dcssblk.c | 16 --------------- fs/block_dev.c | 45 ------------------------------------------- include/linux/blkdev.h | 17 ---------------- 7 files changed, 4 insertions(+), 135 deletions(-) (limited to 'drivers/s390') diff --git a/arch/powerpc/sysdev/axonram.c b/arch/powerpc/sysdev/axonram.c index 171ba86a3494..a7fe5fee744f 100644 --- a/arch/powerpc/sysdev/axonram.c +++ b/arch/powerpc/sysdev/axonram.c @@ -139,6 +139,10 @@ axon_ram_make_request(struct request_queue *queue, struct bio *bio) return BLK_QC_T_NONE; } +static const struct block_device_operations axon_ram_devops = { + .owner = THIS_MODULE, +}; + static long __axon_ram_direct_access(struct axon_ram_bank *bank, pgoff_t pgoff, long nr_pages, void **kaddr, pfn_t *pfn) @@ -150,25 +154,6 @@ __axon_ram_direct_access(struct axon_ram_bank *bank, pgoff_t pgoff, long nr_page return (bank->size - offset) / PAGE_SIZE; } -/** - * axon_ram_direct_access - direct_access() method for block device - * @device, @sector, @data: see block_device_operations method - */ -static long -axon_ram_blk_direct_access(struct block_device *device, sector_t sector, - void **kaddr, pfn_t *pfn, long size) -{ - struct axon_ram_bank *bank = device->bd_disk->private_data; - - return __axon_ram_direct_access(bank, (sector * 512) / PAGE_SIZE, - size / PAGE_SIZE, kaddr, pfn) * PAGE_SIZE; -} - -static const struct block_device_operations axon_ram_devops = { - .owner = THIS_MODULE, - .direct_access = axon_ram_blk_direct_access -}; - static long axon_ram_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, long nr_pages, void **kaddr, pfn_t *pfn) diff --git a/drivers/block/brd.c b/drivers/block/brd.c index 60f3193c9ce2..bfa4ed2c75ef 100644 --- a/drivers/block/brd.c +++ b/drivers/block/brd.c @@ -395,18 +395,6 @@ static long __brd_direct_access(struct brd_device *brd, pgoff_t pgoff, return 1; } -static long brd_blk_direct_access(struct block_device *bdev, sector_t sector, - void **kaddr, pfn_t *pfn, long size) -{ - struct brd_device *brd = bdev->bd_disk->private_data; - long nr_pages = __brd_direct_access(brd, PHYS_PFN(sector * 512), - PHYS_PFN(size), kaddr, pfn); - - if (nr_pages < 0) - return nr_pages; - return nr_pages * PAGE_SIZE; -} - static long brd_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, long nr_pages, void **kaddr, pfn_t *pfn) { @@ -418,14 +406,11 @@ static long brd_dax_direct_access(struct dax_device *dax_dev, static const struct dax_operations brd_dax_ops = { .direct_access = brd_dax_direct_access, }; -#else -#define brd_blk_direct_access NULL #endif static const struct block_device_operations brd_fops = { .owner = THIS_MODULE, .rw_page = brd_rw_page, - .direct_access = brd_blk_direct_access, }; /* diff --git a/drivers/md/dm.c b/drivers/md/dm.c index ef4c6f8cad47..79d5f5fd823e 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -957,18 +957,6 @@ static long dm_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, return ret; } -static long dm_blk_direct_access(struct block_device *bdev, sector_t sector, - void **kaddr, pfn_t *pfn, long size) -{ - struct mapped_device *md = bdev->bd_disk->private_data; - struct dax_device *dax_dev = md->dax_dev; - long nr_pages = size / PAGE_SIZE; - - nr_pages = dm_dax_direct_access(dax_dev, sector / PAGE_SECTORS, - nr_pages, kaddr, pfn); - return nr_pages < 0 ? nr_pages : nr_pages * PAGE_SIZE; -} - /* * A target may call dm_accept_partial_bio only from the map routine. It is * allowed for all bio types except REQ_PREFLUSH. @@ -2823,7 +2811,6 @@ static const struct block_device_operations dm_blk_dops = { .open = dm_blk_open, .release = dm_blk_close, .ioctl = dm_blk_ioctl, - .direct_access = dm_blk_direct_access, .getgeo = dm_blk_getgeo, .pr_ops = &dm_pr_ops, .owner = THIS_MODULE diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index fbbcf8154eec..85b85633d674 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -220,19 +220,9 @@ __weak long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff, return PHYS_PFN(pmem->size - pmem->pfn_pad - offset); } -static long pmem_blk_direct_access(struct block_device *bdev, sector_t sector, - void **kaddr, pfn_t *pfn, long size) -{ - struct pmem_device *pmem = bdev->bd_queue->queuedata; - - return __pmem_direct_access(pmem, PHYS_PFN(sector * 512), - PHYS_PFN(size), kaddr, pfn); -} - static const struct block_device_operations pmem_fops = { .owner = THIS_MODULE, .rw_page = pmem_rw_page, - .direct_access = pmem_blk_direct_access, .revalidate_disk = nvdimm_revalidate_disk, }; diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c index dc84cfd4e438..36e5280af3e4 100644 --- a/drivers/s390/block/dcssblk.c +++ b/drivers/s390/block/dcssblk.c @@ -31,8 +31,6 @@ static int dcssblk_open(struct block_device *bdev, fmode_t mode); static void dcssblk_release(struct gendisk *disk, fmode_t mode); static blk_qc_t dcssblk_make_request(struct request_queue *q, struct bio *bio); -static long dcssblk_blk_direct_access(struct block_device *bdev, sector_t secnum, - void **kaddr, pfn_t *pfn, long size); static long dcssblk_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, long nr_pages, void **kaddr, pfn_t *pfn); @@ -43,7 +41,6 @@ static const struct block_device_operations dcssblk_devops = { .owner = THIS_MODULE, .open = dcssblk_open, .release = dcssblk_release, - .direct_access = dcssblk_blk_direct_access, }; static const struct dax_operations dcssblk_dax_ops = { @@ -915,19 +912,6 @@ __dcssblk_direct_access(struct dcssblk_dev_info *dev_info, pgoff_t pgoff, return (dev_sz - offset) / PAGE_SIZE; } -static long -dcssblk_blk_direct_access(struct block_device *bdev, sector_t secnum, - void **kaddr, pfn_t *pfn, long size) -{ - struct dcssblk_dev_info *dev_info; - - dev_info = bdev->bd_disk->private_data; - if (!dev_info) - return -ENODEV; - return __dcssblk_direct_access(dev_info, PHYS_PFN(secnum * 512), - PHYS_PFN(size), kaddr, pfn) * PAGE_SIZE; -} - static long dcssblk_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, long nr_pages, void **kaddr, pfn_t *pfn) diff --git a/fs/block_dev.c b/fs/block_dev.c index ecbdc8f9f718..10e21465d5a9 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -718,51 +718,6 @@ int bdev_write_page(struct block_device *bdev, sector_t sector, } EXPORT_SYMBOL_GPL(bdev_write_page); -/** - * bdev_direct_access() - Get the address for directly-accessibly memory - * @bdev: The device containing the memory - * @dax: control and output parameters for ->direct_access - * - * If a block device is made up of directly addressable memory, this function - * will tell the caller the PFN and the address of the memory. The address - * may be directly dereferenced within the kernel without the need to call - * ioremap(), kmap() or similar. The PFN is suitable for inserting into - * page tables. - * - * Return: negative errno if an error occurs, otherwise the number of bytes - * accessible at this address. - */ -long bdev_direct_access(struct block_device *bdev, struct blk_dax_ctl *dax) -{ - sector_t sector = dax->sector; - long avail, size = dax->size; - const struct block_device_operations *ops = bdev->bd_disk->fops; - - /* - * The device driver is allowed to sleep, in order to make the - * memory directly accessible. - */ - might_sleep(); - - if (size < 0) - return size; - if (!blk_queue_dax(bdev_get_queue(bdev)) || !ops->direct_access) - return -EOPNOTSUPP; - if ((sector + DIV_ROUND_UP(size, 512)) > - part_nr_sects_read(bdev->bd_part)) - return -ERANGE; - sector += get_start_sect(bdev); - if (sector % (PAGE_SIZE / 512)) - return -EINVAL; - avail = ops->direct_access(bdev, sector, &dax->addr, &dax->pfn, size); - if (!avail) - return -ERANGE; - if (avail > 0 && avail & ~PAGE_MASK) - return -ENXIO; - return min(avail, size); -} -EXPORT_SYMBOL_GPL(bdev_direct_access); - int bdev_dax_pgoff(struct block_device *bdev, sector_t sector, size_t size, pgoff_t *pgoff) { diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 612c497d1461..848f87eb1905 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1916,28 +1916,12 @@ static inline bool integrity_req_gap_front_merge(struct request *req, #endif /* CONFIG_BLK_DEV_INTEGRITY */ -/** - * struct blk_dax_ctl - control and output parameters for ->direct_access - * @sector: (input) offset relative to a block_device - * @addr: (output) kernel virtual address for @sector populated by driver - * @pfn: (output) page frame number for @addr populated by driver - * @size: (input) number of bytes requested - */ -struct blk_dax_ctl { - sector_t sector; - void *addr; - long size; - pfn_t pfn; -}; - struct block_device_operations { int (*open) (struct block_device *, fmode_t); void (*release) (struct gendisk *, fmode_t); int (*rw_page)(struct block_device *, sector_t, struct page *, bool); int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); - long (*direct_access)(struct block_device *, sector_t, void **, pfn_t *, - long); unsigned int (*check_events) (struct gendisk *disk, unsigned int clearing); /* ->media_changed() is DEPRECATED, use ->check_events() instead */ @@ -1956,7 +1940,6 @@ extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, extern int bdev_read_page(struct block_device *, sector_t, struct page *); extern int bdev_write_page(struct block_device *, sector_t, struct page *, struct writeback_control *); -extern long bdev_direct_access(struct block_device *, struct blk_dax_ctl *); extern int bdev_dax_supported(struct super_block *, int); int bdev_dax_pgoff(struct block_device *, sector_t, size_t, pgoff_t *pgoff); #else /* CONFIG_BLOCK */ -- cgit v1.2.3