Adopt nvram module to reduce code duplication. The IOC_NVRAM_GET_OFFSET ioctl as implemented on PPC64 validates the offset returned by pmac_get_partition(). Add this test to the nvram module. Note that the old PPC32 generic_nvram module lacked this test. So when CONFIG_PPC32 && CONFIG_PPC_PMAC, the IOC_NVRAM_GET_OFFSET ioctl would have returned 0 (always). But when CONFIG_PPC64 && CONFIG_PPC_PMAC, the IOC_NVRAM_GET_OFFSET ioctl would have returned -1 (which is -EPERM) when the requested partition was not found. With this patch, the result is now -EINVAL on both PPC32 and PPC64 when the requested PowerMac NVRAM partition is not found. This is a userspace-visible change, in the non-existent partition case, which would be in an error path for an IOC_NVRAM_GET_OFFSET ioctl syscall. Signed-off-by: Finn Thain --- BTW, the IOC_NVRAM_SYNC ioctl call returns -EINVAL on PPC64. This patch retains this behaviour though it might be better to actually perform a sync. Both PPC64 and PPC32 kernels implement ppc_md.nvram_sync() for Core99, but on PPC64 the ioctl is unimplemented (unlike PPC32). --- Changed since v1: - The -ENOENT that appeared in v1 was changed to -EINVAL, to be consistent with existing logic, that is, if (part < pmac_nvram_OF || part > pmac_nvram_NR) return -EINVAL; Changed since v3: - Fixed comment in powerpc/platforms/pseries/nvram.c --- arch/powerpc/Kconfig | 3 arch/powerpc/kernel/nvram_64.c | 203 ++++--------------------------- arch/powerpc/platforms/powermac/Makefile | 5 arch/powerpc/platforms/powermac/setup.c | 2 arch/powerpc/platforms/pseries/nvram.c | 2 drivers/char/nvram.c | 2 6 files changed, 36 insertions(+), 181 deletions(-) Index: linux/arch/powerpc/Kconfig =================================================================== --- linux.orig/arch/powerpc/Kconfig 2015-07-25 17:45:48.000000000 +1000 +++ linux/arch/powerpc/Kconfig 2015-07-25 17:45:51.000000000 +1000 @@ -179,10 +179,9 @@ config SYSVIPC_COMPAT depends on COMPAT && SYSVIPC default y -# All PPC32s use generic nvram driver through ppc_md config HAVE_ARCH_NVRAM_OPS bool - default y if PPC32 + default y config SCHED_OMIT_FRAME_POINTER bool Index: linux/arch/powerpc/kernel/nvram_64.c =================================================================== --- linux.orig/arch/powerpc/kernel/nvram_64.c 2015-07-25 17:42:33.000000000 +1000 +++ linux/arch/powerpc/kernel/nvram_64.c 2015-07-25 17:45:51.000000000 +1000 @@ -7,12 +7,6 @@ * 2 of the License, or (at your option) any later version. * * /dev/nvram driver for PPC64 - * - * This perhaps should live in drivers/char - * - * TODO: Split the /dev/nvram part (that one can use - * drivers/char/generic_nvram.c) from the arch & partition - * parsing code. */ #include @@ -731,153 +725,6 @@ static void oops_to_nvram(struct kmsg_du spin_unlock_irqrestore(&lock, flags); } -static loff_t dev_nvram_llseek(struct file *file, loff_t offset, int origin) -{ - int size; - - if (ppc_md.nvram_size == NULL) - return -ENODEV; - size = ppc_md.nvram_size(); - - switch (origin) { - case 1: - offset += file->f_pos; - break; - case 2: - offset += size; - break; - } - if (offset < 0) - return -EINVAL; - file->f_pos = offset; - return file->f_pos; -} - - -static ssize_t dev_nvram_read(struct file *file, char __user *buf, - size_t count, loff_t *ppos) -{ - ssize_t ret; - char *tmp = NULL; - ssize_t size; - - if (!ppc_md.nvram_size) { - ret = -ENODEV; - goto out; - } - - size = ppc_md.nvram_size(); - if (size < 0) { - ret = size; - goto out; - } - - if (*ppos >= size) { - ret = 0; - goto out; - } - - count = min_t(size_t, count, size - *ppos); - count = min(count, PAGE_SIZE); - - tmp = kmalloc(count, GFP_KERNEL); - if (!tmp) { - ret = -ENOMEM; - goto out; - } - - ret = ppc_md.nvram_read(tmp, count, ppos); - if (ret <= 0) - goto out; - - if (copy_to_user(buf, tmp, ret)) - ret = -EFAULT; - -out: - kfree(tmp); - return ret; - -} - -static ssize_t dev_nvram_write(struct file *file, const char __user *buf, - size_t count, loff_t *ppos) -{ - ssize_t ret; - char *tmp = NULL; - ssize_t size; - - ret = -ENODEV; - if (!ppc_md.nvram_size) - goto out; - - ret = 0; - size = ppc_md.nvram_size(); - if (*ppos >= size || size < 0) - goto out; - - count = min_t(size_t, count, size - *ppos); - count = min(count, PAGE_SIZE); - - ret = -ENOMEM; - tmp = kmalloc(count, GFP_KERNEL); - if (!tmp) - goto out; - - ret = -EFAULT; - if (copy_from_user(tmp, buf, count)) - goto out; - - ret = ppc_md.nvram_write(tmp, count, ppos); - -out: - kfree(tmp); - return ret; - -} - -static long dev_nvram_ioctl(struct file *file, unsigned int cmd, - unsigned long arg) -{ - switch(cmd) { -#ifdef CONFIG_PPC_PMAC - case OBSOLETE_PMAC_NVRAM_GET_OFFSET: - printk(KERN_WARNING "nvram: Using obsolete PMAC_NVRAM_GET_OFFSET ioctl\n"); - case IOC_NVRAM_GET_OFFSET: { - int part, offset; - - if (!machine_is(powermac)) - return -EINVAL; - 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 (offset < 0) - return offset; - if (copy_to_user((void __user*)arg, &offset, sizeof(offset)) != 0) - return -EFAULT; - return 0; - } -#endif /* CONFIG_PPC_PMAC */ - default: - return -EINVAL; - } -} - -const struct file_operations nvram_fops = { - .owner = THIS_MODULE, - .llseek = dev_nvram_llseek, - .read = dev_nvram_read, - .write = dev_nvram_write, - .unlocked_ioctl = dev_nvram_ioctl, -}; - -static struct miscdevice nvram_dev = { - NVRAM_MINOR, - "nvram", - &nvram_fops -}; - #ifdef DEBUG_NVRAM static void __init nvram_print_partitions(char * label) @@ -1026,6 +873,8 @@ loff_t __init nvram_create_partition(con long size = 0; int rc; + BUILD_BUG_ON(NVRAM_BLOCK_LEN != 16); + /* Convert sizes from bytes to blocks */ req_size = _ALIGN_UP(req_size, NVRAM_BLOCK_LEN) / NVRAM_BLOCK_LEN; min_size = _ALIGN_UP(min_size, NVRAM_BLOCK_LEN) / NVRAM_BLOCK_LEN; @@ -1226,29 +1075,41 @@ int __init nvram_scan_partitions(void) return err; } -static int __init nvram_init(void) + +#if IS_ENABLED(CONFIG_NVRAM) + +static ssize_t ppc_nvram_read(char *buf, size_t count, loff_t *index) { - int rc; - - BUILD_BUG_ON(NVRAM_BLOCK_LEN != 16); + if (ppc_md.nvram_read) + return ppc_md.nvram_read(buf, count, index); + return -EINVAL; +} - if (ppc_md.nvram_size == NULL || ppc_md.nvram_size() <= 0) - return -ENODEV; +static ssize_t ppc_nvram_write(char *buf, size_t count, loff_t *index) +{ + if (ppc_md.nvram_write) + return ppc_md.nvram_write(buf, count, index); + return -EINVAL; +} - rc = misc_register(&nvram_dev); - if (rc != 0) { - printk(KERN_ERR "nvram_init: failed to register device\n"); - return rc; - } - - return rc; +static ssize_t ppc_nvram_get_size(void) +{ + if (ppc_md.nvram_size) + return ppc_md.nvram_size(); + return -ENODEV; } -static void __exit nvram_cleanup(void) +static long ppc_nvram_sync(void) { - misc_deregister( &nvram_dev ); + return -EINVAL; } -module_init(nvram_init); -module_exit(nvram_cleanup); -MODULE_LICENSE("GPL"); +const struct nvram_ops arch_nvram_ops = { + .read = ppc_nvram_read, + .write = ppc_nvram_write, + .get_size = ppc_nvram_get_size, + .sync = ppc_nvram_sync, +}; +EXPORT_SYMBOL(arch_nvram_ops); + +#endif /* CONFIG_NVRAM */ Index: linux/arch/powerpc/platforms/powermac/Makefile =================================================================== --- linux.orig/arch/powerpc/platforms/powermac/Makefile 2015-07-25 17:42:33.000000000 +1000 +++ linux/arch/powerpc/platforms/powermac/Makefile 2015-07-25 17:45:51.000000000 +1000 @@ -9,11 +9,6 @@ obj-y += pic.o setup.o time.o feature sleep.o low_i2c.o cache.o pfunc_core.o \ pfunc_base.o udbg_scc.o udbg_adb.o obj-$(CONFIG_PMAC_BACKLIGHT) += backlight.o -# CONFIG_NVRAM is an arch. independent tristate symbol, for pmac32 we really -# need this to be a bool. Cheat here and pretend CONFIG_NVRAM=m is really -# CONFIG_NVRAM=y obj-$(CONFIG_NVRAM:m=y) += nvram.o -# ppc64 pmac doesn't define CONFIG_NVRAM but needs nvram stuff -obj-$(CONFIG_PPC64) += nvram.o obj-$(CONFIG_PPC32) += bootx_init.o obj-$(CONFIG_SMP) += smp.o Index: linux/arch/powerpc/platforms/powermac/setup.c =================================================================== --- linux.orig/arch/powerpc/platforms/powermac/setup.c 2015-07-25 17:45:48.000000000 +1000 +++ linux/arch/powerpc/platforms/powermac/setup.c 2015-07-25 17:45:51.000000000 +1000 @@ -321,7 +321,7 @@ static void __init pmac_setup_arch(void) find_via_pmu(); smu_init(); -#if IS_ENABLED(CONFIG_NVRAM) || defined(CONFIG_PPC64) +#if IS_ENABLED(CONFIG_NVRAM) pmac_nvram_init(); #endif Index: linux/drivers/char/nvram.c =================================================================== --- linux.orig/drivers/char/nvram.c 2015-07-25 17:45:47.000000000 +1000 +++ linux/drivers/char/nvram.c 2015-07-25 17:45:51.000000000 +1000 @@ -342,6 +342,8 @@ static long nvram_misc_ioctl(struct file if (part < pmac_nvram_OF || part > pmac_nvram_NR) return -EINVAL; offset = pmac_get_partition(part); + if (offset < 0) + return -EINVAL; if (copy_to_user((void __user *)arg, &offset, sizeof(offset)) != 0) return -EFAULT; Index: linux/arch/powerpc/platforms/pseries/nvram.c =================================================================== --- linux.orig/arch/powerpc/platforms/pseries/nvram.c 2015-07-25 17:42:33.000000000 +1000 +++ linux/arch/powerpc/platforms/pseries/nvram.c 2015-07-25 17:45:51.000000000 +1000 @@ -7,8 +7,6 @@ * 2 of the License, or (at your option) any later version. * * /dev/nvram driver for PPC64 - * - * This perhaps should live in drivers/char */ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/