diff options
| -rw-r--r-- | arch/powerpc/platforms/Kconfig | 1 | ||||
| -rw-r--r-- | arch/powerpc/sysdev/axonram.c | 48 |
2 files changed, 43 insertions, 6 deletions
diff --git a/arch/powerpc/platforms/Kconfig b/arch/powerpc/platforms/Kconfig index 7e3a2ebba29b..33244e3d9375 100644 --- a/arch/powerpc/platforms/Kconfig +++ b/arch/powerpc/platforms/Kconfig @@ -284,6 +284,7 @@ config CPM2 config AXON_RAM tristate "Axon DDR2 memory device driver" depends on PPC_IBM_CELL_BLADE && BLOCK + select DAX default m help It registers one block device per Axon's DDR2 memory bank found diff --git a/arch/powerpc/sysdev/axonram.c b/arch/powerpc/sysdev/axonram.c index f523ac883150..171ba86a3494 100644 --- a/arch/powerpc/sysdev/axonram.c +++ b/arch/powerpc/sysdev/axonram.c @@ -25,6 +25,7 @@ #include <linux/bio.h> #include <linux/blkdev.h> +#include <linux/dax.h> #include <linux/device.h> #include <linux/errno.h> #include <linux/fs.h> @@ -62,6 +63,7 @@ static int azfs_major, azfs_minor; struct axon_ram_bank { struct platform_device *device; struct gendisk *disk; + struct dax_device *dax_dev; unsigned int irq_id; unsigned long ph_addr; unsigned long io_addr; @@ -137,25 +139,47 @@ axon_ram_make_request(struct request_queue *queue, struct bio *bio) return BLK_QC_T_NONE; } +static long +__axon_ram_direct_access(struct axon_ram_bank *bank, pgoff_t pgoff, long nr_pages, + void **kaddr, pfn_t *pfn) +{ + resource_size_t offset = pgoff * PAGE_SIZE; + + *kaddr = (void *) bank->io_addr + offset; + *pfn = phys_to_pfn_t(bank->ph_addr + offset, PFN_DEV); + 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_direct_access(struct block_device *device, sector_t sector, +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; - 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; + 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_direct_access + .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) +{ + struct axon_ram_bank *bank = dax_get_private(dax_dev); + + return __axon_ram_direct_access(bank, pgoff, nr_pages, kaddr, pfn); +} + +static const struct dax_operations axon_ram_dax_ops = { + .direct_access = axon_ram_dax_direct_access, }; /** @@ -219,6 +243,7 @@ static int axon_ram_probe(struct platform_device *device) goto failed; } + bank->disk->major = azfs_major; bank->disk->first_minor = azfs_minor; bank->disk->fops = &axon_ram_devops; @@ -227,6 +252,13 @@ static int axon_ram_probe(struct platform_device *device) sprintf(bank->disk->disk_name, "%s%d", AXON_RAM_DEVICE_NAME, axon_ram_bank_id); + bank->dax_dev = alloc_dax(bank, bank->disk->disk_name, + &axon_ram_dax_ops); + if (!bank->dax_dev) { + rc = -ENOMEM; + goto failed; + } + bank->disk->queue = blk_alloc_queue(GFP_KERNEL); if (bank->disk->queue == NULL) { dev_err(&device->dev, "Cannot register disk queue\n"); @@ -278,6 +310,8 @@ failed: del_gendisk(bank->disk); put_disk(bank->disk); } + kill_dax(bank->dax_dev); + put_dax(bank->dax_dev); device->dev.platform_data = NULL; if (bank->io_addr != 0) iounmap((void __iomem *) bank->io_addr); @@ -300,6 +334,8 @@ axon_ram_remove(struct platform_device *device) device_remove_file(&device->dev, &dev_attr_ecc); free_irq(bank->irq_id, device); + kill_dax(bank->dax_dev); + put_dax(bank->dax_dev); del_gendisk(bank->disk); put_disk(bank->disk); iounmap((void __iomem *) bank->io_addr); |