/*
* This is the /proc/ide/ filesystem implementation.
*
+ * The major reason this exists is to provide sufficient access
+ * to driver and config data, such that user-mode programs can
+ * be developed to handle chipset tuning for most PCI interfaces.
+ * This should provide better utilities, and less kernel bloat.
+ *
+ * The entire pci config space for a PCI interface chipset can be
+ * retrieved by just reading it. e.g. "cat /proc/ide3/config"
+ *
+ * To modify registers *safely*, do something like:
+ * echo "P40:88" >/proc/ide/ide3/config
+ * That expression writes 0x88 to pci config register 0x40
+ * on the chip which controls ide3. Multiple tuples can be issued,
+ * and the writes will be completed as an atomic set:
+ * echo "P40:88 P41:35 P42:00 P43:00" >/proc/ide/ide3/config
+ *
+ * All numbers must be specified using pairs of ascii hex digits.
+ * It is important to note that these writes will be performed
+ * after waiting for the IDE controller (both interfaces)
+ * to be completely idle, to ensure no corruption of I/O in progress.
+ *
+ * Non-PCI registers can also be written, using "R" in place of "P"
+ * in the above examples. The size of the port transfer is determined
+ * by the number of pairs of hex digits given for the data. If a two
+ * digit value is given, the write will be a byte operation; if four
+ * digits are used, the write will be performed as a 16-bit operation;
+ * and if eight digits are specified, a 32-bit "dword" write will be
+ * performed. Odd numbers of digits are not permitted.
+ *
+ * If there is an error *anywhere* in the string of registers/data
+ * then *none* of the writes will be performed.
+ *
* Drive/Driver settings can be retrieved by reading the drive's
* "settings" files. e.g. "cat /proc/ide0/hda/settings"
* To write a new value "val" into a specific setting "name", use:
* returned data as 256 16-bit words. The "hdparm" utility will
* be updated someday soon to use this mechanism.
*
+ * Feel free to develop and distribute fancy GUI configuration
+ * utilities for your favorite PCI chipsets. I'll be working on
+ * one for the Promise 20246 someday soon. -ml
+ *
*/
#include <linux/config.h>
#include <asm/io.h>
+static int do_proc_ide_write_config(struct file *file, const char __user *buffer,
+ unsigned long count, void *data)
+{
+ ide_hwif_t *hwif = ide_hwif_from_key(data);
+ ide_hwgroup_t *mygroup = (ide_hwgroup_t *)(hwif->hwgroup);
+ ide_hwgroup_t *mategroup = NULL;
+ unsigned long timeout;
+ unsigned long flags;
+ const char *start = NULL, *msg = NULL;
+ struct entry { u32 val; u16 reg; u8 size; u8 pci; } *prog, *q, *r;
+ int want_pci = 0;
+ char *buf, *s;
+ int err;
+
+ if (hwif->mate && hwif->mate->hwgroup)
+ mategroup = (ide_hwgroup_t *)(hwif->mate->hwgroup);
+
+ if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
+ return -EACCES;
+
+ if (count >= PAGE_SIZE)
+ return -EINVAL;
+
+ s = buf = (char *)__get_free_page(GFP_USER);
+ if (!buf)
+ return -ENOMEM;
+
+ err = -ENOMEM;
+ q = prog = (struct entry *)__get_free_page(GFP_USER);
+ if (!prog)
+ goto out;
+
+ err = -EFAULT;
+ if (copy_from_user(buf, buffer, count))
+ goto out1;
+
+ buf[count] = '\0';
+
+ while (isspace(*s))
+ s++;
+
+ while (*s) {
+ char *p;
+ int digits;
+
+ start = s;
+
+ if ((char *)(q + 1) > (char *)prog + PAGE_SIZE) {
+ msg = "too many entries";
+ goto parse_error;
+ }
+
+ switch (*s++) {
+ case 'R': q->pci = 0;
+ break;
+ case 'P': q->pci = 1;
+ want_pci = 1;
+ break;
+ default: msg = "expected 'R' or 'P'";
+ goto parse_error;
+ }
+
+ q->reg = simple_strtoul(s, &p, 16);
+ digits = p - s;
+ if (!digits || digits > 4 || (q->pci && q->reg > 0xff)) {
+ msg = "bad/missing register number";
+ goto parse_error;
+ }
+ if (*p++ != ':') {
+ msg = "missing ':'";
+ goto parse_error;
+ }
+ q->val = simple_strtoul(p, &s, 16);
+ digits = s - p;
+ if (digits != 2 && digits != 4 && digits != 8) {
+ msg = "bad data, 2/4/8 digits required";
+ goto parse_error;
+ }
+ q->size = digits / 2;
+
+ if (q->pci) {
+#ifdef CONFIG_BLK_DEV_IDEPCI
+ if (q->reg & (q->size - 1)) {
+ msg = "misaligned access";
+ goto parse_error;
+ }
+#else
+ msg = "not a PCI device";
+ goto parse_error;
+#endif /* CONFIG_BLK_DEV_IDEPCI */
+ }
+
+ q++;
+
+ if (*s && !isspace(*s++)) {
+ msg = "expected whitespace after data";
+ goto parse_error;
+ }
+ while (isspace(*s))
+ s++;
+ }
+
+ /*
+ * What follows below is fucking insane, even for IDE people.
+ * For now I've dealt with the obvious problems on the parsing
+ * side, but IMNSHO we should simply remove the write access
+ * to /proc/ide/.../config, killing that FPOS completely.
+ */
+
+ err = -EBUSY;
+ timeout = jiffies + (3 * HZ);
+ spin_lock_irqsave(&ide_lock, flags);
+ while (mygroup->busy ||
+ (mategroup && mategroup->busy)) {
+ spin_unlock_irqrestore(&ide_lock, flags);
+ if (time_after(jiffies, timeout)) {
+ printk("/proc/ide/%s/config: channel(s) busy, cannot write\n", hwif->name);
+ goto out1;
+ }
+ spin_lock_irqsave(&ide_lock, flags);
+ }
+
+#ifdef CONFIG_BLK_DEV_IDEPCI
+ if (want_pci && (!hwif->pci_dev || hwif->pci_dev->vendor)) {
+ spin_unlock_irqrestore(&ide_lock, flags);
+ printk("proc_ide: PCI registers not accessible for %s\n",
+ hwif->name);
+ err = -EINVAL;
+ goto out1;
+ }
+#endif /* CONFIG_BLK_DEV_IDEPCI */
+
+ for (r = prog; r < q; r++) {
+ unsigned int reg = r->reg, val = r->val;
+ if (r->pci) {
+#ifdef CONFIG_BLK_DEV_IDEPCI
+ int rc = 0;
+ struct pci_dev *dev = hwif->pci_dev;
+ switch (q->size) {
+ case 1: msg = "byte";
+ rc = pci_write_config_byte(dev, reg, val);
+ break;
+ case 2: msg = "word";
+ rc = pci_write_config_word(dev, reg, val);
+ break;
+ case 4: msg = "dword";
+ rc = pci_write_config_dword(dev, reg, val);
+ break;
+ }
+ if (rc) {
+ spin_unlock_irqrestore(&ide_lock, flags);
+ printk("proc_ide_write_config: error writing %s at bus %02x dev %02x reg 0x%x value 0x%x\n",
+ msg, dev->bus->number, dev->devfn, reg, val);
+ printk("proc_ide_write_config: error %d\n", rc);
+ err = -EIO;
+ goto out1;
+ }
+#endif /* CONFIG_BLK_DEV_IDEPCI */
+ } else { /* not pci */
+ switch (r->size) {
+ case 1: hwif->OUTB(val, reg);
+ break;
+ case 2: hwif->OUTW(val, reg);
+ break;
+ case 4: hwif->OUTL(val, reg);
+ break;
+ }
+ }
+ }
+ spin_unlock_irqrestore(&ide_lock, flags);
+ err = count;
+out1:
+ free_page((unsigned long)prog);
+out:
+ free_page((unsigned long)buf);
+ return err;
+
+parse_error:
+ printk("parse error\n");
+ printk("proc_ide: error: %s: '%s'\n", msg, start);
+ err = -EINVAL;
+ goto out1;
+}
+
+static int proc_ide_write_config(struct file *file, const char __user *buffer,
+ unsigned long count, void *data)
+{
+ int ret;
+ down(&ide_cfg_sem);
+ ret = do_proc_ide_write_config(file, buffer, count, data);
+ up(&ide_cfg_sem);
+ return ret;
+}
+
+static int proc_ide_read_config
+ (char *page, char **start, off_t off, int count, int *eof, void *data)
+{
+ char *out = page;
+ int len;
+
+#ifdef CONFIG_BLK_DEV_IDEPCI
+ ide_hwif_t *hwif = ide_hwif_from_key(data);
+
+ down(&ide_cfg_sem);
+ hwif = ide_hwif_from_key(data);
+
+ if(hwif)
+ {
+ struct pci_dev *dev = hwif->pci_dev;
+ if ((hwif->pci_dev && hwif->pci_dev->vendor) && dev && dev->bus)
+ {
+ int reg = 0;
+
+ out += sprintf(out, "pci bus %02x device %02x vendor %04x "
+ "device %04x channel %d\n",
+ dev->bus->number, dev->devfn,
+ hwif->pci_dev->vendor, hwif->pci_dev->device,
+ hwif->channel);
+ do {
+ u8 val;
+ int rc = pci_read_config_byte(dev, reg, &val);
+ if (rc) {
+ printk("proc_ide_read_config: error %d reading"
+ " bus %02x dev %02x reg 0x%02x\n",
+ rc, dev->bus->number, dev->devfn, reg);
+ out += sprintf(out, "??%c",
+ (++reg & 0xf) ? ' ' : '\n');
+ } else
+ out += sprintf(out, "%02x%c",
+ val, (++reg & 0xf) ? ' ' : '\n');
+ } while (reg < 0x100);
+ }
+ else
+ out += sprintf(out, "(none)\n");
+ }
+#else /* CONFIG_BLK_DEV_IDEPCI */
+ out += sprintf(out, "(none)\n");
+#endif
+ up(&ide_cfg_sem);
+ len = out - page;
+ PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
+}
+
static int proc_ide_read_imodel
(char *page, char **start, off_t off, int count, int *eof, void *data)
{
down(&ide_cfg_sem);
hwif = ide_hwif_from_key(data);
- if(hwif) {
+ if(hwif)
+ {
/*
* Neither ide_unknown nor ide_forced should be set at this point.
*/
- switch (hwif->chipset) {
+ switch (hwif->chipset) {
case ide_generic: name = "generic"; break;
case ide_pci: name = "pci"; break;
case ide_cmd640: name = "cmd640"; break;
case ide_qd65xx: name = "qd65xx"; break;
case ide_umc8672: name = "umc8672"; break;
case ide_ht6560b: name = "ht6560b"; break;
+ case ide_pdc4030: name = "pdc4030"; break;
case ide_rz1000: name = "rz1000"; break;
case ide_trm290: name = "trm290"; break;
case ide_cmd646: name = "cmd646"; break;
case ide_4drives: name = "4drives"; break;
case ide_pmac: name = "mac-io"; break;
default: name = "(unknown)"; break;
- }
+ }
}
len = sprintf(page, "%s\n", name);
up(&ide_cfg_sem);
ide_hwif_t *hwif;
int len;
- down(&ide_cfg_sem);
+ down(&ide_cfg_sem);
hwif = ide_hwif_from_key(data);
if (hwif && hwif->mate && hwif->mate->present)
len = sprintf(page, "%s\n", hwif->mate->name);
PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
}
-static void proc_ide_settings_warn(void)
-{
- static int warned = 0;
-
- if (warned)
- return;
-
- printk(KERN_WARNING "Warning: /proc/ide/hd?/settings interface is "
- "obsolete, and will be removed soon!\n");
- warned = 1;
-}
-
static int proc_ide_read_settings
(char *page, char **start, off_t off, int count, int *eof, void *data)
{
ide_settings_t *setting;
char *out = page;
int len, rc, mul_factor, div_factor;
-
- proc_ide_settings_warn();
-
+
down(&ide_cfg_sem);
drive = ide_drive_from_key(data);
- if(drive == NULL) {
+ if(drive == NULL)
+ {
up(&ide_cfg_sem);
return -EIO;
}
if (drive == NULL)
return -EIO;
- proc_ide_settings_warn();
-
if (count >= PAGE_SIZE)
return -EINVAL;
ide_drive_t *drive;
int len;
+ down(&ide_cfg_sem);
drive = ide_drive_from_key(data);
- if(drive == NULL) {
+ if(drive == NULL)
+ {
up(&ide_cfg_sem);
return -EIO;
}
ide_drive_t *drive;
char *out = page;
int len;
-
+
down(&ide_cfg_sem);
drive = ide_drive_from_key(data);
- if(drive == NULL) {
+ if(drive == NULL)
+ {
up(&ide_cfg_sem);
return -EIO;
}
+
out += sprintf(out,"physical %d/%d/%d\n",
drive->cyl, drive->head, drive->sect);
out += sprintf(out,"logical %d/%d/%d\n",
down(&ide_cfg_sem);
drive = ide_drive_from_key(data);
- if(drive == NULL) {
+ if(drive == NULL)
+ {
up(&ide_cfg_sem);
return -EIO;
}
down(&ide_cfg_sem);
drive = ide_drive_from_key(data);
- if(drive == NULL) {
+ if(drive == NULL)
+ {
up(&ide_cfg_sem);
return -EIO;
}
down(&ide_cfg_sem);
drive = ide_drive_from_key(data);
- if(drive == NULL) {
+ if(drive == NULL)
+ {
up(&ide_cfg_sem);
return -EIO;
}
}
}
-static void destroy_proc_ide_drives(ide_hwif_t *hwif)
+void destroy_proc_ide_drives(ide_hwif_t *hwif)
{
int d;
static ide_proc_entry_t hwif_entries[] = {
{ "channel", S_IFREG|S_IRUGO, proc_ide_read_channel, NULL },
+ { "config", S_IFREG|S_IRUGO|S_IWUSR,proc_ide_read_config, proc_ide_write_config },
{ "mate", S_IFREG|S_IRUGO, proc_ide_read_mate, NULL },
{ "model", S_IFREG|S_IRUGO, proc_ide_read_imodel, NULL },
{ NULL, 0, NULL, NULL }
void destroy_proc_ide_interface(ide_hwif_t *hwif)
{
- if (hwif->proc) {
+ int exist = (hwif->proc != NULL);
+#if 0
+ if (!hwif->present)
+ continue;
+#endif
+ if (exist) {
destroy_proc_ide_drives(hwif);
ide_remove_proc_entries(hwif->proc, hwif_entries);
remove_proc_entry(hwif->name, proc_ide_root);
for (h = 0; h < MAX_HWIFS; h++) {
ide_hwif_t *hwif = &ide_hwifs[h];
-#if 0
- if (!hwif->present)
- continue;
-#endif
destroy_proc_ide_interface(hwif);
}
}
git://git.onelab.eu / linux-2.6.git / blobdiff