727 lines
15 KiB
C
727 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Linux/SPARC PROM Configuration Driver
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* Copyright (C) 1996 Thomas K. Dyas (tdyas@noc.rutgers.edu)
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* Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
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*
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* This character device driver allows user programs to access the
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* PROM device tree. It is compatible with the SunOS /dev/openprom
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* driver and the NetBSD /dev/openprom driver. The SunOS eeprom
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* utility works without any modifications.
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*
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* The driver uses a minor number under the misc device major. The
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* file read/write mode determines the type of access to the PROM.
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* Interrupts are disabled whenever the driver calls into the PROM for
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* sanity's sake.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/mutex.h>
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#include <linux/string.h>
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#include <linux/miscdevice.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <asm/oplib.h>
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#include <asm/prom.h>
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#include <linux/uaccess.h>
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#include <asm/openpromio.h>
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#ifdef CONFIG_PCI
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#include <linux/pci.h>
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#endif
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MODULE_AUTHOR("Thomas K. Dyas (tdyas@noc.rutgers.edu) and Eddie C. Dost (ecd@skynet.be)");
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MODULE_DESCRIPTION("OPENPROM Configuration Driver");
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MODULE_LICENSE("GPL");
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MODULE_VERSION("1.0");
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MODULE_ALIAS_MISCDEV(SUN_OPENPROM_MINOR);
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/* Private data kept by the driver for each descriptor. */
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typedef struct openprom_private_data
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{
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struct device_node *current_node; /* Current node for SunOS ioctls. */
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struct device_node *lastnode; /* Last valid node used by BSD ioctls. */
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} DATA;
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/* ID of the PROM node containing all of the EEPROM options. */
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static DEFINE_MUTEX(openprom_mutex);
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static struct device_node *options_node;
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/*
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* Copy an openpromio structure into kernel space from user space.
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* This routine does error checking to make sure that all memory
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* accesses are within bounds. A pointer to the allocated openpromio
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* structure will be placed in "*opp_p". Return value is the length
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* of the user supplied buffer.
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*/
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static int copyin(struct openpromio __user *info, struct openpromio **opp_p)
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{
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unsigned int bufsize;
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if (!info || !opp_p)
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return -EFAULT;
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if (get_user(bufsize, &info->oprom_size))
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return -EFAULT;
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if (bufsize == 0)
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return -EINVAL;
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/* If the bufsize is too large, just limit it.
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* Fix from Jason Rappleye.
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*/
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if (bufsize > OPROMMAXPARAM)
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bufsize = OPROMMAXPARAM;
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if (!(*opp_p = kzalloc(sizeof(int) + bufsize + 1, GFP_KERNEL)))
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return -ENOMEM;
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if (copy_from_user(&(*opp_p)->oprom_array,
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&info->oprom_array, bufsize)) {
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kfree(*opp_p);
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return -EFAULT;
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}
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return bufsize;
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}
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static int getstrings(struct openpromio __user *info, struct openpromio **opp_p)
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{
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int n, bufsize;
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char c;
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if (!info || !opp_p)
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return -EFAULT;
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if (!(*opp_p = kzalloc(sizeof(int) + OPROMMAXPARAM + 1, GFP_KERNEL)))
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return -ENOMEM;
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(*opp_p)->oprom_size = 0;
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n = bufsize = 0;
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while ((n < 2) && (bufsize < OPROMMAXPARAM)) {
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if (get_user(c, &info->oprom_array[bufsize])) {
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kfree(*opp_p);
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return -EFAULT;
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}
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if (c == '\0')
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n++;
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(*opp_p)->oprom_array[bufsize++] = c;
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}
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if (!n) {
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kfree(*opp_p);
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return -EINVAL;
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}
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return bufsize;
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}
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/*
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* Copy an openpromio structure in kernel space back to user space.
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*/
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static int copyout(void __user *info, struct openpromio *opp, int len)
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{
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if (copy_to_user(info, opp, len))
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return -EFAULT;
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return 0;
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}
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static int opromgetprop(void __user *argp, struct device_node *dp, struct openpromio *op, int bufsize)
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{
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const void *pval;
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int len;
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if (!dp ||
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!(pval = of_get_property(dp, op->oprom_array, &len)) ||
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len <= 0 || len > bufsize)
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return copyout(argp, op, sizeof(int));
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memcpy(op->oprom_array, pval, len);
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op->oprom_array[len] = '\0';
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op->oprom_size = len;
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return copyout(argp, op, sizeof(int) + bufsize);
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}
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static int opromnxtprop(void __user *argp, struct device_node *dp, struct openpromio *op, int bufsize)
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{
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struct property *prop;
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int len;
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if (!dp)
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return copyout(argp, op, sizeof(int));
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if (op->oprom_array[0] == '\0') {
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prop = dp->properties;
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if (!prop)
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return copyout(argp, op, sizeof(int));
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len = strlen(prop->name);
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} else {
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prop = of_find_property(dp, op->oprom_array, NULL);
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if (!prop ||
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!prop->next ||
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(len = strlen(prop->next->name)) + 1 > bufsize)
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return copyout(argp, op, sizeof(int));
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prop = prop->next;
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}
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memcpy(op->oprom_array, prop->name, len);
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op->oprom_array[len] = '\0';
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op->oprom_size = ++len;
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return copyout(argp, op, sizeof(int) + bufsize);
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}
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static int opromsetopt(struct device_node *dp, struct openpromio *op, int bufsize)
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{
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char *buf = op->oprom_array + strlen(op->oprom_array) + 1;
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int len = op->oprom_array + bufsize - buf;
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return of_set_property(options_node, op->oprom_array, buf, len);
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}
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static int opromnext(void __user *argp, unsigned int cmd, struct device_node *dp, struct openpromio *op, int bufsize, DATA *data)
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{
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phandle ph;
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BUILD_BUG_ON(sizeof(phandle) != sizeof(int));
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if (bufsize < sizeof(phandle))
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return -EINVAL;
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ph = *((int *) op->oprom_array);
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if (ph) {
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dp = of_find_node_by_phandle(ph);
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if (!dp)
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return -EINVAL;
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switch (cmd) {
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case OPROMNEXT:
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dp = dp->sibling;
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break;
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case OPROMCHILD:
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dp = dp->child;
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break;
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case OPROMSETCUR:
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default:
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break;
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}
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} else {
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/* Sibling of node zero is the root node. */
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if (cmd != OPROMNEXT)
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return -EINVAL;
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dp = of_find_node_by_path("/");
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}
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ph = 0;
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if (dp)
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ph = dp->phandle;
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data->current_node = dp;
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*((int *) op->oprom_array) = ph;
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op->oprom_size = sizeof(phandle);
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return copyout(argp, op, bufsize + sizeof(int));
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}
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static int oprompci2node(void __user *argp, struct device_node *dp, struct openpromio *op, int bufsize, DATA *data)
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{
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int err = -EINVAL;
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if (bufsize >= 2*sizeof(int)) {
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#ifdef CONFIG_PCI
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struct pci_dev *pdev;
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struct device_node *dp;
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pdev = pci_get_domain_bus_and_slot(0,
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((int *) op->oprom_array)[0],
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((int *) op->oprom_array)[1]);
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dp = pci_device_to_OF_node(pdev);
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data->current_node = dp;
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*((int *)op->oprom_array) = dp->phandle;
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op->oprom_size = sizeof(int);
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err = copyout(argp, op, bufsize + sizeof(int));
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pci_dev_put(pdev);
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#endif
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}
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return err;
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}
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static int oprompath2node(void __user *argp, struct device_node *dp, struct openpromio *op, int bufsize, DATA *data)
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{
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phandle ph = 0;
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dp = of_find_node_by_path(op->oprom_array);
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if (dp)
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ph = dp->phandle;
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data->current_node = dp;
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*((int *)op->oprom_array) = ph;
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op->oprom_size = sizeof(int);
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return copyout(argp, op, bufsize + sizeof(int));
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}
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static int opromgetbootargs(void __user *argp, struct openpromio *op, int bufsize)
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{
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char *buf = saved_command_line;
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int len = strlen(buf);
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if (len > bufsize)
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return -EINVAL;
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strcpy(op->oprom_array, buf);
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op->oprom_size = len;
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return copyout(argp, op, bufsize + sizeof(int));
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}
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/*
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* SunOS and Solaris /dev/openprom ioctl calls.
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*/
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static long openprom_sunos_ioctl(struct file * file,
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unsigned int cmd, unsigned long arg,
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struct device_node *dp)
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{
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DATA *data = file->private_data;
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struct openpromio *opp = NULL;
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int bufsize, error = 0;
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static int cnt;
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void __user *argp = (void __user *)arg;
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if (cmd == OPROMSETOPT)
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bufsize = getstrings(argp, &opp);
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else
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bufsize = copyin(argp, &opp);
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if (bufsize < 0)
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return bufsize;
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mutex_lock(&openprom_mutex);
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switch (cmd) {
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case OPROMGETOPT:
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case OPROMGETPROP:
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error = opromgetprop(argp, dp, opp, bufsize);
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break;
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case OPROMNXTOPT:
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case OPROMNXTPROP:
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error = opromnxtprop(argp, dp, opp, bufsize);
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break;
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case OPROMSETOPT:
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case OPROMSETOPT2:
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error = opromsetopt(dp, opp, bufsize);
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break;
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case OPROMNEXT:
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case OPROMCHILD:
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case OPROMSETCUR:
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error = opromnext(argp, cmd, dp, opp, bufsize, data);
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break;
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case OPROMPCI2NODE:
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error = oprompci2node(argp, dp, opp, bufsize, data);
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break;
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case OPROMPATH2NODE:
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error = oprompath2node(argp, dp, opp, bufsize, data);
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break;
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case OPROMGETBOOTARGS:
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error = opromgetbootargs(argp, opp, bufsize);
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break;
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case OPROMU2P:
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case OPROMGETCONS:
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case OPROMGETFBNAME:
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if (cnt++ < 10)
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printk(KERN_INFO "openprom_sunos_ioctl: unimplemented ioctl\n");
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error = -EINVAL;
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break;
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default:
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if (cnt++ < 10)
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printk(KERN_INFO "openprom_sunos_ioctl: cmd 0x%X, arg 0x%lX\n", cmd, arg);
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error = -EINVAL;
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break;
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}
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kfree(opp);
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mutex_unlock(&openprom_mutex);
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return error;
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}
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static struct device_node *get_node(phandle n, DATA *data)
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{
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struct device_node *dp = of_find_node_by_phandle(n);
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if (dp)
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data->lastnode = dp;
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return dp;
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}
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/* Copy in a whole string from userspace into kernelspace. */
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static char * copyin_string(char __user *user, size_t len)
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{
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if ((ssize_t)len < 0 || (ssize_t)(len + 1) < 0)
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return ERR_PTR(-EINVAL);
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return memdup_user_nul(user, len);
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}
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/*
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* NetBSD /dev/openprom ioctl calls.
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*/
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static int opiocget(void __user *argp, DATA *data)
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{
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struct opiocdesc op;
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struct device_node *dp;
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char *str;
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const void *pval;
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int err, len;
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if (copy_from_user(&op, argp, sizeof(op)))
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return -EFAULT;
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dp = get_node(op.op_nodeid, data);
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str = copyin_string(op.op_name, op.op_namelen);
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if (IS_ERR(str))
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return PTR_ERR(str);
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pval = of_get_property(dp, str, &len);
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err = 0;
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if (!pval || len > op.op_buflen) {
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err = -EINVAL;
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} else {
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op.op_buflen = len;
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if (copy_to_user(argp, &op, sizeof(op)) ||
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copy_to_user(op.op_buf, pval, len))
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err = -EFAULT;
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}
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kfree(str);
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return err;
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}
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static int opiocnextprop(void __user *argp, DATA *data)
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{
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struct opiocdesc op;
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struct device_node *dp;
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struct property *prop;
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char *str;
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int len;
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if (copy_from_user(&op, argp, sizeof(op)))
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return -EFAULT;
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dp = get_node(op.op_nodeid, data);
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if (!dp)
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return -EINVAL;
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str = copyin_string(op.op_name, op.op_namelen);
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if (IS_ERR(str))
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return PTR_ERR(str);
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if (str[0] == '\0') {
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prop = dp->properties;
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} else {
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prop = of_find_property(dp, str, NULL);
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if (prop)
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prop = prop->next;
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}
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kfree(str);
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if (!prop)
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len = 0;
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else
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len = prop->length;
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if (len > op.op_buflen)
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len = op.op_buflen;
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if (copy_to_user(argp, &op, sizeof(op)))
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return -EFAULT;
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if (len &&
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copy_to_user(op.op_buf, prop->value, len))
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return -EFAULT;
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return 0;
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}
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static int opiocset(void __user *argp, DATA *data)
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{
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struct opiocdesc op;
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struct device_node *dp;
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char *str, *tmp;
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int err;
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if (copy_from_user(&op, argp, sizeof(op)))
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return -EFAULT;
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dp = get_node(op.op_nodeid, data);
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if (!dp)
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return -EINVAL;
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str = copyin_string(op.op_name, op.op_namelen);
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if (IS_ERR(str))
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return PTR_ERR(str);
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tmp = copyin_string(op.op_buf, op.op_buflen);
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if (IS_ERR(tmp)) {
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kfree(str);
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return PTR_ERR(tmp);
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}
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err = of_set_property(dp, str, tmp, op.op_buflen);
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kfree(str);
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kfree(tmp);
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return err;
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}
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static int opiocgetnext(unsigned int cmd, void __user *argp)
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{
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struct device_node *dp;
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phandle nd;
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BUILD_BUG_ON(sizeof(phandle) != sizeof(int));
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if (copy_from_user(&nd, argp, sizeof(phandle)))
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return -EFAULT;
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if (nd == 0) {
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if (cmd != OPIOCGETNEXT)
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return -EINVAL;
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dp = of_find_node_by_path("/");
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} else {
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dp = of_find_node_by_phandle(nd);
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nd = 0;
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if (dp) {
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if (cmd == OPIOCGETNEXT)
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dp = dp->sibling;
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else
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dp = dp->child;
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}
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}
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if (dp)
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nd = dp->phandle;
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if (copy_to_user(argp, &nd, sizeof(phandle)))
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return -EFAULT;
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return 0;
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}
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static int openprom_bsd_ioctl(struct file * file,
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unsigned int cmd, unsigned long arg)
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{
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DATA *data = file->private_data;
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void __user *argp = (void __user *)arg;
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int err;
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mutex_lock(&openprom_mutex);
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switch (cmd) {
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case OPIOCGET:
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err = opiocget(argp, data);
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break;
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case OPIOCNEXTPROP:
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err = opiocnextprop(argp, data);
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break;
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case OPIOCSET:
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err = opiocset(argp, data);
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break;
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case OPIOCGETOPTNODE:
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BUILD_BUG_ON(sizeof(phandle) != sizeof(int));
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err = 0;
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if (copy_to_user(argp, &options_node->phandle, sizeof(phandle)))
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err = -EFAULT;
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break;
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case OPIOCGETNEXT:
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case OPIOCGETCHILD:
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|
err = opiocgetnext(cmd, argp);
|
|
break;
|
|
|
|
default:
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
mutex_unlock(&openprom_mutex);
|
|
|
|
return err;
|
|
}
|
|
|
|
|
|
/*
|
|
* Handoff control to the correct ioctl handler.
|
|
*/
|
|
static long openprom_ioctl(struct file * file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
DATA *data = file->private_data;
|
|
|
|
switch (cmd) {
|
|
case OPROMGETOPT:
|
|
case OPROMNXTOPT:
|
|
if ((file->f_mode & FMODE_READ) == 0)
|
|
return -EPERM;
|
|
return openprom_sunos_ioctl(file, cmd, arg,
|
|
options_node);
|
|
|
|
case OPROMSETOPT:
|
|
case OPROMSETOPT2:
|
|
if ((file->f_mode & FMODE_WRITE) == 0)
|
|
return -EPERM;
|
|
return openprom_sunos_ioctl(file, cmd, arg,
|
|
options_node);
|
|
|
|
case OPROMNEXT:
|
|
case OPROMCHILD:
|
|
case OPROMGETPROP:
|
|
case OPROMNXTPROP:
|
|
if ((file->f_mode & FMODE_READ) == 0)
|
|
return -EPERM;
|
|
return openprom_sunos_ioctl(file, cmd, arg,
|
|
data->current_node);
|
|
|
|
case OPROMU2P:
|
|
case OPROMGETCONS:
|
|
case OPROMGETFBNAME:
|
|
case OPROMGETBOOTARGS:
|
|
case OPROMSETCUR:
|
|
case OPROMPCI2NODE:
|
|
case OPROMPATH2NODE:
|
|
if ((file->f_mode & FMODE_READ) == 0)
|
|
return -EPERM;
|
|
return openprom_sunos_ioctl(file, cmd, arg, NULL);
|
|
|
|
case OPIOCGET:
|
|
case OPIOCNEXTPROP:
|
|
case OPIOCGETOPTNODE:
|
|
case OPIOCGETNEXT:
|
|
case OPIOCGETCHILD:
|
|
if ((file->f_mode & FMODE_READ) == 0)
|
|
return -EBADF;
|
|
return openprom_bsd_ioctl(file,cmd,arg);
|
|
|
|
case OPIOCSET:
|
|
if ((file->f_mode & FMODE_WRITE) == 0)
|
|
return -EBADF;
|
|
return openprom_bsd_ioctl(file,cmd,arg);
|
|
|
|
default:
|
|
return -EINVAL;
|
|
};
|
|
}
|
|
|
|
static long openprom_compat_ioctl(struct file *file, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
long rval = -ENOTTY;
|
|
|
|
/*
|
|
* SunOS/Solaris only, the NetBSD one's have embedded pointers in
|
|
* the arg which we'd need to clean up...
|
|
*/
|
|
switch (cmd) {
|
|
case OPROMGETOPT:
|
|
case OPROMSETOPT:
|
|
case OPROMNXTOPT:
|
|
case OPROMSETOPT2:
|
|
case OPROMNEXT:
|
|
case OPROMCHILD:
|
|
case OPROMGETPROP:
|
|
case OPROMNXTPROP:
|
|
case OPROMU2P:
|
|
case OPROMGETCONS:
|
|
case OPROMGETFBNAME:
|
|
case OPROMGETBOOTARGS:
|
|
case OPROMSETCUR:
|
|
case OPROMPCI2NODE:
|
|
case OPROMPATH2NODE:
|
|
rval = openprom_ioctl(file, cmd, arg);
|
|
break;
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
static int openprom_open(struct inode * inode, struct file * file)
|
|
{
|
|
DATA *data;
|
|
|
|
data = kmalloc(sizeof(DATA), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
mutex_lock(&openprom_mutex);
|
|
data->current_node = of_find_node_by_path("/");
|
|
data->lastnode = data->current_node;
|
|
file->private_data = (void *) data;
|
|
mutex_unlock(&openprom_mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int openprom_release(struct inode * inode, struct file * file)
|
|
{
|
|
kfree(file->private_data);
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations openprom_fops = {
|
|
.owner = THIS_MODULE,
|
|
.llseek = no_llseek,
|
|
.unlocked_ioctl = openprom_ioctl,
|
|
.compat_ioctl = openprom_compat_ioctl,
|
|
.open = openprom_open,
|
|
.release = openprom_release,
|
|
};
|
|
|
|
static struct miscdevice openprom_dev = {
|
|
.minor = SUN_OPENPROM_MINOR,
|
|
.name = "openprom",
|
|
.fops = &openprom_fops,
|
|
};
|
|
|
|
static int __init openprom_init(void)
|
|
{
|
|
int err;
|
|
|
|
err = misc_register(&openprom_dev);
|
|
if (err)
|
|
return err;
|
|
|
|
options_node = of_get_child_by_name(of_find_node_by_path("/"), "options");
|
|
if (!options_node) {
|
|
misc_deregister(&openprom_dev);
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit openprom_cleanup(void)
|
|
{
|
|
misc_deregister(&openprom_dev);
|
|
}
|
|
|
|
module_init(openprom_init);
|
|
module_exit(openprom_cleanup);
|