From 9a23409b69440e76d34dc23846cae44f46f60d98 Mon Sep 17 00:00:00 2001
From: Maxim Shchetynin <maxim@de.ibm.com>
Date: Wed, 16 Jul 2008 05:51:41 +1000
Subject: powerpc/axonram: Use only one block device major number
Axonram module registers one block device for each DDR2 DIMM found
on a system. This means that each DDR2 DIMM becomes its own block device
major number. This patch lets axonram module to register the only one
block device for all DDR2 DIMMs which also spares kernel resources.
Signed-off-by: Maxim Shchetynin <maxim@de.ibm.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
arch/powerpc/sysdev/axonram.c | 23 +++++++++++++++--------
1 file changed, 15 insertions(+), 8 deletions(-)
(limited to 'arch/powerpc/sysdev/axonram.c')
diff --git a/arch/powerpc/sysdev/axonram.c b/arch/powerpc/sysdev/axonram.c
index 7f59188cd9a..9b639ede06d 100644
--- a/arch/powerpc/sysdev/axonram.c
+++ b/arch/powerpc/sysdev/axonram.c
@@ -57,6 +57,8 @@
#define AXON_RAM_SECTOR_SIZE 1 << AXON_RAM_SECTOR_SHIFT
#define AXON_RAM_IRQ_FLAGS IRQF_SHARED | IRQF_TRIGGER_RISING
+static int azfs_major, azfs_minor;
+
struct axon_ram_bank {
struct of_device *device;
struct gendisk *disk;
@@ -227,19 +229,14 @@ axon_ram_probe(struct of_device *device, const struct of_device_id *device_id)
goto failed;
}
- bank->disk->first_minor = 0;
+ bank->disk->major = azfs_major;
+ bank->disk->first_minor = azfs_minor;
bank->disk->fops = &axon_ram_devops;
bank->disk->private_data = bank;
bank->disk->driverfs_dev = &device->dev;
sprintf(bank->disk->disk_name, "%s%d",
AXON_RAM_DEVICE_NAME, axon_ram_bank_id);
- bank->disk->major = register_blkdev(0, bank->disk->disk_name);
- if (bank->disk->major < 0) {
- dev_err(&device->dev, "Cannot register block device\n");
- rc = -EFAULT;
- goto failed;
- }
bank->disk->queue = blk_alloc_queue(GFP_KERNEL);
if (bank->disk->queue == NULL) {
@@ -276,6 +273,8 @@ axon_ram_probe(struct of_device *device, const struct of_device_id *device_id)
goto failed;
}
+ azfs_minor += bank->disk->minors;
+
return 0;
failed:
@@ -310,7 +309,6 @@ axon_ram_remove(struct of_device *device)
device_remove_file(&device->dev, &dev_attr_ecc);
free_irq(bank->irq_id, device);
- unregister_blkdev(bank->disk->major, bank->disk->disk_name);
del_gendisk(bank->disk);
iounmap((void __iomem *) bank->io_addr);
kfree(bank);
@@ -341,6 +339,14 @@ static struct of_platform_driver axon_ram_driver = {
static int __init
axon_ram_init(void)
{
+ azfs_major = register_blkdev(azfs_major, AXON_RAM_DEVICE_NAME);
+ if (azfs_major < 0) {
+ printk(KERN_ERR "%s cannot become block device major number\n",
+ AXON_RAM_MODULE_NAME);
+ return -EFAULT;
+ }
+ azfs_minor = 0;
+
return of_register_platform_driver(&axon_ram_driver);
}
@@ -351,6 +357,7 @@ static void __exit
axon_ram_exit(void)
{
of_unregister_platform_driver(&axon_ram_driver);
+ unregister_blkdev(azfs_major, AXON_RAM_DEVICE_NAME);
}
module_init(axon_ram_init);
--
cgit v1.2.3-70-g09d2
From 8204cba7fa0ca0752fdaec021dae2634788178aa Mon Sep 17 00:00:00 2001
From: Maxim Shchetynin <maxim@de.ibm.com>
Date: Wed, 16 Jul 2008 05:51:42 +1000
Subject: powerpc/axonram: Enable partitioning of the Axons DDR2 DIMMs
DDR2 memory DIMMs on the Axon could be accessed only as one partition
when using file system drivers which are using the direct_access() method.
This patch enables for such file system drivers to access Axon's DDR2 memory
even if it is splitted in several partitions.
Signed-off-by: Maxim Shchetynin <maxim@de.ibm.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
arch/powerpc/sysdev/axonram.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
(limited to 'arch/powerpc/sysdev/axonram.c')
diff --git a/arch/powerpc/sysdev/axonram.c b/arch/powerpc/sysdev/axonram.c
index 9b639ede06d..9e105cbc5e5 100644
--- a/arch/powerpc/sysdev/axonram.c
+++ b/arch/powerpc/sysdev/axonram.c
@@ -150,7 +150,10 @@ axon_ram_direct_access(struct block_device *device, sector_t sector,
struct axon_ram_bank *bank = device->bd_disk->private_data;
loff_t offset;
- offset = sector << AXON_RAM_SECTOR_SHIFT;
+ offset = sector;
+ if (device->bd_part != NULL)
+ offset += device->bd_part->start_sect;
+ offset <<= AXON_RAM_SECTOR_SHIFT;
if (offset >= bank->size) {
dev_err(&bank->device->dev, "Access outside of address space\n");
return -ERANGE;
--
cgit v1.2.3-70-g09d2