![Zhang Yanfei](/assets/img/avatar_default.png)
remove cast for kmalloc/kzalloc return value. Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: linuxppc-dev@lists.ozlabs.org Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
564 lines
14 KiB
C
564 lines
14 KiB
C
/*
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* c 2001 PPC 64 Team, IBM Corp
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* /dev/nvram driver for PPC64
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*
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* This perhaps should live in drivers/char
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*
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* TODO: Split the /dev/nvram part (that one can use
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* drivers/char/generic_nvram.c) from the arch & partition
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* parsing code.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/miscdevice.h>
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#include <linux/fcntl.h>
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#include <linux/nvram.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <asm/uaccess.h>
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#include <asm/nvram.h>
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#include <asm/rtas.h>
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#include <asm/prom.h>
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#include <asm/machdep.h>
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#undef DEBUG_NVRAM
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#define NVRAM_HEADER_LEN sizeof(struct nvram_header)
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#define NVRAM_BLOCK_LEN NVRAM_HEADER_LEN
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/* If change this size, then change the size of NVNAME_LEN */
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struct nvram_header {
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unsigned char signature;
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unsigned char checksum;
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unsigned short length;
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/* Terminating null required only for names < 12 chars. */
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char name[12];
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};
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struct nvram_partition {
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struct list_head partition;
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struct nvram_header header;
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unsigned int index;
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};
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static LIST_HEAD(nvram_partitions);
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static loff_t dev_nvram_llseek(struct file *file, loff_t offset, int origin)
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{
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int size;
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if (ppc_md.nvram_size == NULL)
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return -ENODEV;
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size = ppc_md.nvram_size();
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switch (origin) {
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case 1:
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offset += file->f_pos;
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break;
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case 2:
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offset += size;
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break;
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}
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if (offset < 0)
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return -EINVAL;
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file->f_pos = offset;
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return file->f_pos;
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}
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static ssize_t dev_nvram_read(struct file *file, char __user *buf,
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size_t count, loff_t *ppos)
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{
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ssize_t ret;
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char *tmp = NULL;
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ssize_t size;
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ret = -ENODEV;
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if (!ppc_md.nvram_size)
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goto out;
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ret = 0;
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size = ppc_md.nvram_size();
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if (*ppos >= size || size < 0)
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goto out;
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count = min_t(size_t, count, size - *ppos);
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count = min(count, PAGE_SIZE);
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ret = -ENOMEM;
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tmp = kmalloc(count, GFP_KERNEL);
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if (!tmp)
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goto out;
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ret = ppc_md.nvram_read(tmp, count, ppos);
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if (ret <= 0)
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goto out;
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if (copy_to_user(buf, tmp, ret))
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ret = -EFAULT;
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out:
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kfree(tmp);
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return ret;
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}
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static ssize_t dev_nvram_write(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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ssize_t ret;
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char *tmp = NULL;
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ssize_t size;
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ret = -ENODEV;
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if (!ppc_md.nvram_size)
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goto out;
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ret = 0;
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size = ppc_md.nvram_size();
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if (*ppos >= size || size < 0)
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goto out;
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count = min_t(size_t, count, size - *ppos);
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count = min(count, PAGE_SIZE);
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ret = -ENOMEM;
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tmp = kmalloc(count, GFP_KERNEL);
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if (!tmp)
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goto out;
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ret = -EFAULT;
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if (copy_from_user(tmp, buf, count))
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goto out;
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ret = ppc_md.nvram_write(tmp, count, ppos);
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out:
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kfree(tmp);
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return ret;
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}
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static long dev_nvram_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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switch(cmd) {
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#ifdef CONFIG_PPC_PMAC
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case OBSOLETE_PMAC_NVRAM_GET_OFFSET:
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printk(KERN_WARNING "nvram: Using obsolete PMAC_NVRAM_GET_OFFSET ioctl\n");
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case IOC_NVRAM_GET_OFFSET: {
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int part, offset;
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if (!machine_is(powermac))
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return -EINVAL;
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if (copy_from_user(&part, (void __user*)arg, sizeof(part)) != 0)
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return -EFAULT;
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if (part < pmac_nvram_OF || part > pmac_nvram_NR)
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return -EINVAL;
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offset = pmac_get_partition(part);
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if (offset < 0)
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return offset;
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if (copy_to_user((void __user*)arg, &offset, sizeof(offset)) != 0)
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return -EFAULT;
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return 0;
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}
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#endif /* CONFIG_PPC_PMAC */
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default:
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return -EINVAL;
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}
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}
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const struct file_operations nvram_fops = {
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.owner = THIS_MODULE,
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.llseek = dev_nvram_llseek,
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.read = dev_nvram_read,
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.write = dev_nvram_write,
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.unlocked_ioctl = dev_nvram_ioctl,
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};
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static struct miscdevice nvram_dev = {
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NVRAM_MINOR,
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"nvram",
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&nvram_fops
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};
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#ifdef DEBUG_NVRAM
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static void __init nvram_print_partitions(char * label)
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{
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struct nvram_partition * tmp_part;
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printk(KERN_WARNING "--------%s---------\n", label);
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printk(KERN_WARNING "indx\t\tsig\tchks\tlen\tname\n");
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list_for_each_entry(tmp_part, &nvram_partitions, partition) {
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printk(KERN_WARNING "%4d \t%02x\t%02x\t%d\t%12s\n",
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tmp_part->index, tmp_part->header.signature,
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tmp_part->header.checksum, tmp_part->header.length,
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tmp_part->header.name);
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}
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}
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#endif
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static int __init nvram_write_header(struct nvram_partition * part)
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{
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loff_t tmp_index;
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int rc;
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tmp_index = part->index;
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rc = ppc_md.nvram_write((char *)&part->header, NVRAM_HEADER_LEN, &tmp_index);
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return rc;
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}
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static unsigned char __init nvram_checksum(struct nvram_header *p)
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{
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unsigned int c_sum, c_sum2;
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unsigned short *sp = (unsigned short *)p->name; /* assume 6 shorts */
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c_sum = p->signature + p->length + sp[0] + sp[1] + sp[2] + sp[3] + sp[4] + sp[5];
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/* The sum may have spilled into the 3rd byte. Fold it back. */
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c_sum = ((c_sum & 0xffff) + (c_sum >> 16)) & 0xffff;
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/* The sum cannot exceed 2 bytes. Fold it into a checksum */
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c_sum2 = (c_sum >> 8) + (c_sum << 8);
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c_sum = ((c_sum + c_sum2) >> 8) & 0xff;
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return c_sum;
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}
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/*
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* Per the criteria passed via nvram_remove_partition(), should this
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* partition be removed? 1=remove, 0=keep
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*/
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static int nvram_can_remove_partition(struct nvram_partition *part,
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const char *name, int sig, const char *exceptions[])
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{
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if (part->header.signature != sig)
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return 0;
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if (name) {
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if (strncmp(name, part->header.name, 12))
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return 0;
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} else if (exceptions) {
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const char **except;
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for (except = exceptions; *except; except++) {
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if (!strncmp(*except, part->header.name, 12))
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return 0;
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}
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}
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return 1;
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}
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/**
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* nvram_remove_partition - Remove one or more partitions in nvram
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* @name: name of the partition to remove, or NULL for a
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* signature only match
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* @sig: signature of the partition(s) to remove
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* @exceptions: When removing all partitions with a matching signature,
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* leave these alone.
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*/
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int __init nvram_remove_partition(const char *name, int sig,
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const char *exceptions[])
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{
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struct nvram_partition *part, *prev, *tmp;
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int rc;
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list_for_each_entry(part, &nvram_partitions, partition) {
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if (!nvram_can_remove_partition(part, name, sig, exceptions))
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continue;
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/* Make partition a free partition */
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part->header.signature = NVRAM_SIG_FREE;
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strncpy(part->header.name, "wwwwwwwwwwww", 12);
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part->header.checksum = nvram_checksum(&part->header);
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rc = nvram_write_header(part);
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if (rc <= 0) {
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printk(KERN_ERR "nvram_remove_partition: nvram_write failed (%d)\n", rc);
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return rc;
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}
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}
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/* Merge contiguous ones */
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prev = NULL;
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list_for_each_entry_safe(part, tmp, &nvram_partitions, partition) {
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if (part->header.signature != NVRAM_SIG_FREE) {
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prev = NULL;
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continue;
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}
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if (prev) {
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prev->header.length += part->header.length;
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prev->header.checksum = nvram_checksum(&part->header);
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rc = nvram_write_header(part);
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if (rc <= 0) {
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printk(KERN_ERR "nvram_remove_partition: nvram_write failed (%d)\n", rc);
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return rc;
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}
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list_del(&part->partition);
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kfree(part);
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} else
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prev = part;
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}
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return 0;
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}
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/**
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* nvram_create_partition - Create a partition in nvram
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* @name: name of the partition to create
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* @sig: signature of the partition to create
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* @req_size: size of data to allocate in bytes
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* @min_size: minimum acceptable size (0 means req_size)
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*
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* Returns a negative error code or a positive nvram index
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* of the beginning of the data area of the newly created
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* partition. If you provided a min_size smaller than req_size
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* you need to query for the actual size yourself after the
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* call using nvram_partition_get_size().
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*/
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loff_t __init nvram_create_partition(const char *name, int sig,
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int req_size, int min_size)
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{
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struct nvram_partition *part;
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struct nvram_partition *new_part;
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struct nvram_partition *free_part = NULL;
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static char nv_init_vals[16];
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loff_t tmp_index;
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long size = 0;
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int rc;
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/* Convert sizes from bytes to blocks */
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req_size = _ALIGN_UP(req_size, NVRAM_BLOCK_LEN) / NVRAM_BLOCK_LEN;
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min_size = _ALIGN_UP(min_size, NVRAM_BLOCK_LEN) / NVRAM_BLOCK_LEN;
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/* If no minimum size specified, make it the same as the
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* requested size
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*/
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if (min_size == 0)
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min_size = req_size;
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if (min_size > req_size)
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return -EINVAL;
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/* Now add one block to each for the header */
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req_size += 1;
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min_size += 1;
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/* Find a free partition that will give us the maximum needed size
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If can't find one that will give us the minimum size needed */
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list_for_each_entry(part, &nvram_partitions, partition) {
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if (part->header.signature != NVRAM_SIG_FREE)
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continue;
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if (part->header.length >= req_size) {
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size = req_size;
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free_part = part;
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break;
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}
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if (part->header.length > size &&
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part->header.length >= min_size) {
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size = part->header.length;
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free_part = part;
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}
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}
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if (!size)
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return -ENOSPC;
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/* Create our OS partition */
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new_part = kmalloc(sizeof(*new_part), GFP_KERNEL);
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if (!new_part) {
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pr_err("nvram_create_os_partition: kmalloc failed\n");
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return -ENOMEM;
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}
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new_part->index = free_part->index;
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new_part->header.signature = sig;
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new_part->header.length = size;
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strncpy(new_part->header.name, name, 12);
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new_part->header.checksum = nvram_checksum(&new_part->header);
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rc = nvram_write_header(new_part);
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if (rc <= 0) {
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pr_err("nvram_create_os_partition: nvram_write_header "
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"failed (%d)\n", rc);
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return rc;
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}
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list_add_tail(&new_part->partition, &free_part->partition);
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/* Adjust or remove the partition we stole the space from */
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if (free_part->header.length > size) {
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free_part->index += size * NVRAM_BLOCK_LEN;
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free_part->header.length -= size;
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free_part->header.checksum = nvram_checksum(&free_part->header);
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rc = nvram_write_header(free_part);
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if (rc <= 0) {
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pr_err("nvram_create_os_partition: nvram_write_header "
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"failed (%d)\n", rc);
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return rc;
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}
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} else {
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list_del(&free_part->partition);
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kfree(free_part);
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}
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/* Clear the new partition */
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for (tmp_index = new_part->index + NVRAM_HEADER_LEN;
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tmp_index < ((size - 1) * NVRAM_BLOCK_LEN);
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tmp_index += NVRAM_BLOCK_LEN) {
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rc = ppc_md.nvram_write(nv_init_vals, NVRAM_BLOCK_LEN, &tmp_index);
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if (rc <= 0) {
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pr_err("nvram_create_partition: nvram_write failed (%d)\n", rc);
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return rc;
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}
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}
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return new_part->index + NVRAM_HEADER_LEN;
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}
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/**
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* nvram_get_partition_size - Get the data size of an nvram partition
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* @data_index: This is the offset of the start of the data of
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* the partition. The same value that is returned by
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* nvram_create_partition().
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*/
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int nvram_get_partition_size(loff_t data_index)
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{
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struct nvram_partition *part;
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list_for_each_entry(part, &nvram_partitions, partition) {
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if (part->index + NVRAM_HEADER_LEN == data_index)
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return (part->header.length - 1) * NVRAM_BLOCK_LEN;
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}
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return -1;
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}
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/**
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* nvram_find_partition - Find an nvram partition by signature and name
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* @name: Name of the partition or NULL for any name
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* @sig: Signature to test against
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* @out_size: if non-NULL, returns the size of the data part of the partition
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*/
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loff_t nvram_find_partition(const char *name, int sig, int *out_size)
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{
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struct nvram_partition *p;
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list_for_each_entry(p, &nvram_partitions, partition) {
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if (p->header.signature == sig &&
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(!name || !strncmp(p->header.name, name, 12))) {
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if (out_size)
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*out_size = (p->header.length - 1) *
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NVRAM_BLOCK_LEN;
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return p->index + NVRAM_HEADER_LEN;
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}
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}
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return 0;
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}
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int __init nvram_scan_partitions(void)
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{
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loff_t cur_index = 0;
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struct nvram_header phead;
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struct nvram_partition * tmp_part;
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unsigned char c_sum;
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char * header;
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int total_size;
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int err;
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if (ppc_md.nvram_size == NULL || ppc_md.nvram_size() <= 0)
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return -ENODEV;
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total_size = ppc_md.nvram_size();
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header = kmalloc(NVRAM_HEADER_LEN, GFP_KERNEL);
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if (!header) {
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printk(KERN_ERR "nvram_scan_partitions: Failed kmalloc\n");
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return -ENOMEM;
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}
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while (cur_index < total_size) {
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err = ppc_md.nvram_read(header, NVRAM_HEADER_LEN, &cur_index);
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if (err != NVRAM_HEADER_LEN) {
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printk(KERN_ERR "nvram_scan_partitions: Error parsing "
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"nvram partitions\n");
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goto out;
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}
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cur_index -= NVRAM_HEADER_LEN; /* nvram_read will advance us */
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memcpy(&phead, header, NVRAM_HEADER_LEN);
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err = 0;
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c_sum = nvram_checksum(&phead);
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if (c_sum != phead.checksum) {
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printk(KERN_WARNING "WARNING: nvram partition checksum"
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" was %02x, should be %02x!\n",
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phead.checksum, c_sum);
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printk(KERN_WARNING "Terminating nvram partition scan\n");
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goto out;
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}
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if (!phead.length) {
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printk(KERN_WARNING "WARNING: nvram corruption "
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"detected: 0-length partition\n");
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goto out;
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}
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tmp_part = kmalloc(sizeof(struct nvram_partition), GFP_KERNEL);
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err = -ENOMEM;
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if (!tmp_part) {
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printk(KERN_ERR "nvram_scan_partitions: kmalloc failed\n");
|
|
goto out;
|
|
}
|
|
|
|
memcpy(&tmp_part->header, &phead, NVRAM_HEADER_LEN);
|
|
tmp_part->index = cur_index;
|
|
list_add_tail(&tmp_part->partition, &nvram_partitions);
|
|
|
|
cur_index += phead.length * NVRAM_BLOCK_LEN;
|
|
}
|
|
err = 0;
|
|
|
|
#ifdef DEBUG_NVRAM
|
|
nvram_print_partitions("NVRAM Partitions");
|
|
#endif
|
|
|
|
out:
|
|
kfree(header);
|
|
return err;
|
|
}
|
|
|
|
static int __init nvram_init(void)
|
|
{
|
|
int rc;
|
|
|
|
BUILD_BUG_ON(NVRAM_BLOCK_LEN != 16);
|
|
|
|
if (ppc_md.nvram_size == NULL || ppc_md.nvram_size() <= 0)
|
|
return -ENODEV;
|
|
|
|
rc = misc_register(&nvram_dev);
|
|
if (rc != 0) {
|
|
printk(KERN_ERR "nvram_init: failed to register device\n");
|
|
return rc;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
void __exit nvram_cleanup(void)
|
|
{
|
|
misc_deregister( &nvram_dev );
|
|
}
|
|
|
|
module_init(nvram_init);
|
|
module_exit(nvram_cleanup);
|
|
MODULE_LICENSE("GPL");
|