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axon_ram: add dax_operations support

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Setup a dax_device to have the same lifetime as the axon_ram block
device and add a ->direct_access() method that is equivalent to
axon_ram_direct_access(). Once fs/dax.c has been converted to use
dax_operations the old axon_ram_direct_access() will be removed.

Reported-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2017-01-25 15:25:11 -08:00
parent c1d6e828a3
commit 60fcd55cc2
2 changed files with 43 additions and 6 deletions
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1
arch/powerpc/platforms/Kconfig
View File

@ -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

48
arch/powerpc/sysdev/axonram.c
View File

@ -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);