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powerpc: Implement nvram ioctls

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Add the powerpc-specific ioctls to the nvram module. This allows the nvram
module to replace the generic_nvram module.

Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Finn Thain 2019-01-15 15:18:56 +11:00 committed by Greg Kroah-Hartman
parent ebcebc7f45
commit 95ac14b8a3
2 changed files with 40 additions and 0 deletions
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38
drivers/char/nvram.c
View File

@ -48,6 +48,9 @@
#include <linux/mutex.h>
#include <linux/pagemap.h>
#ifdef CONFIG_PPC
#include <asm/nvram.h>
#endif
static DEFINE_MUTEX(nvram_mutex);
static DEFINE_SPINLOCK(nvram_state_lock);
@ -283,6 +286,38 @@ static long nvram_misc_ioctl(struct file *file, unsigned int cmd,
long ret = -ENOTTY;
switch (cmd) {
#ifdef CONFIG_PPC
case OBSOLETE_PMAC_NVRAM_GET_OFFSET:
pr_warn("nvram: Using obsolete PMAC_NVRAM_GET_OFFSET ioctl\n");
/* fall through */
case IOC_NVRAM_GET_OFFSET:
ret = -EINVAL;
#ifdef CONFIG_PPC_PMAC
if (machine_is(powermac)) {
int part, offset;
if (copy_from_user(&part, (void __user *)arg,
sizeof(part)) != 0)
return -EFAULT;
if (part < pmac_nvram_OF || part > pmac_nvram_NR)
return -EINVAL;
offset = pmac_get_partition(part);
if (copy_to_user((void __user *)arg,
&offset, sizeof(offset)) != 0)
return -EFAULT;
ret = 0;
}
#endif
break;
case IOC_NVRAM_SYNC:
if (ppc_md.nvram_sync != NULL) {
mutex_lock(&nvram_mutex);
ppc_md.nvram_sync();
mutex_unlock(&nvram_mutex);
}
ret = 0;
break;
#elif defined(CONFIG_X86) || defined(CONFIG_M68K)
case NVRAM_INIT:
/* initialize NVRAM contents and checksum */
if (!capable(CAP_SYS_ADMIN))
@ -306,6 +341,7 @@ static long nvram_misc_ioctl(struct file *file, unsigned int cmd,
mutex_unlock(&nvram_mutex);
}
break;
#endif /* CONFIG_X86 || CONFIG_M68K */
}
return ret;
}
@ -321,12 +357,14 @@ static int nvram_misc_open(struct inode *inode, struct file *file)
return -EBUSY;
}
#if defined(CONFIG_X86) || defined(CONFIG_M68K)
/* Prevent multiple writers if the set_checksum ioctl is implemented. */
if ((arch_nvram_ops.set_checksum != NULL) &&
(file->f_mode & FMODE_WRITE) && (nvram_open_mode & NVRAM_WRITE)) {
spin_unlock(&nvram_state_lock);
return -EBUSY;
}
#endif
if (file->f_flags & O_EXCL)
nvram_open_mode |= NVRAM_EXCL;

2
include/linux/nvram.h
View File

@ -31,8 +31,10 @@ struct nvram_ops {
void (*write_byte)(unsigned char, int);
ssize_t (*read)(char *, size_t, loff_t *);
ssize_t (*write)(char *, size_t, loff_t *);
#if defined(CONFIG_X86) || defined(CONFIG_M68K)
long (*initialize)(void);
long (*set_checksum)(void);
#endif
};
extern const struct nvram_ops arch_nvram_ops;