patch-2.1.82 linux/drivers/pci/proc.c

• Lines: 293
• Date: Mon Jan 26 11:43:18 1998
• Orig file: v2.1.81/linux/drivers/pci/proc.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.81/linux/drivers/pci/proc.c linux/drivers/pci/proc.c
@@ -0,0 +1,292 @@
+/*
+ *	$Id: proc.c,v 1.1 1997/12/22 17:22:31 mj Exp $
+ *
+ *	Procfs interface for the PCI bus.
+ *
+ *	Copyright (c) 1997 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
+ */
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/bios32.h>
+#include <linux/pci.h>
+#include <linux/proc_fs.h>
+#include <linux/init.h>
+#include <asm/uaccess.h>
+#include <asm/byteorder.h>
+
+#define PCI_CFG_SPACE_SIZE 256
+
+static loff_t
+proc_bus_pci_lseek(struct file *file, loff_t off, int whence)
+{
+	loff_t new;
+
+	switch (whence) {
+	case 0:
+		new = off;
+		break;
+	case 1:
+		new = file->f_pos + off;
+		break;
+	case 2:
+		new = PCI_CFG_SPACE_SIZE + off;
+		break;
+	default:
+		return -EINVAL;
+	}
+	if (new < 0 || new > PCI_CFG_SPACE_SIZE)
+		return -EINVAL;
+	return (file->f_pos = new);
+}
+
+static ssize_t
+proc_bus_pci_read(struct file *file, char *buf, size_t nbytes, loff_t *ppos)
+{
+	struct inode *ino = file->f_dentry->d_inode;
+	struct proc_dir_entry *dp = ino->u.generic_ip;
+	struct pci_dev *dev = dp->data;
+	int pos = *ppos;
+	unsigned char bus = dev->bus->number;
+	unsigned char dfn = dev->devfn;
+	int cnt;
+
+	if (pos >= PCI_CFG_SPACE_SIZE)
+		return 0;
+	if (nbytes >= PCI_CFG_SPACE_SIZE)
+		nbytes = PCI_CFG_SPACE_SIZE;
+	if (pos + nbytes > PCI_CFG_SPACE_SIZE)
+		nbytes = PCI_CFG_SPACE_SIZE - pos;
+	cnt = nbytes;
+
+	if (!access_ok(VERIFY_WRITE, buf, cnt))
+		return -EINVAL;
+
+	if ((pos & 1) && cnt) {
+		unsigned char val;
+		pcibios_read_config_byte(bus, dfn, pos, &val);
+		__put_user(val, buf);
+		buf++;
+		pos++;
+		cnt--;
+	}
+
+	if ((pos & 3) && cnt > 2) {
+		unsigned short val;
+		pcibios_read_config_word(bus, dfn, pos, &val);
+		__put_user(cpu_to_le16(val), (unsigned short *) buf);
+		buf += 2;
+		pos += 2;
+		cnt -= 2;
+	}
+
+	while (cnt >= 4) {
+		unsigned int val;
+		pcibios_read_config_dword(bus, dfn, pos, &val);
+		__put_user(cpu_to_le32(val), (unsigned int *) buf);
+		buf += 4;
+		pos += 4;
+		cnt -= 4;
+	}
+
+	if (cnt >= 2) {
+		unsigned short val;
+		pcibios_read_config_word(bus, dfn, pos, &val);
+		__put_user(cpu_to_le16(val), (unsigned short *) buf);
+		buf += 2;
+		pos += 2;
+		cnt -= 2;
+	}
+
+	if (cnt) {
+		unsigned char val;
+		pcibios_read_config_byte(bus, dfn, pos, &val);
+		__put_user(val, buf);
+		buf++;
+		pos++;
+		cnt--;
+	}
+
+	*ppos = pos;
+	return nbytes;
+}
+
+static ssize_t
+proc_bus_pci_write(struct file *file, const char *buf, size_t nbytes, loff_t *ppos)
+{
+	struct inode *ino = file->f_dentry->d_inode;
+	struct proc_dir_entry *dp = ino->u.generic_ip;
+	struct pci_dev *dev = dp->data;
+	int pos = *ppos;
+	unsigned char bus = dev->bus->number;
+	unsigned char dfn = dev->devfn;
+	int cnt;
+
+	if (pos >= PCI_CFG_SPACE_SIZE)
+		return 0;
+	if (nbytes >= PCI_CFG_SPACE_SIZE)
+		nbytes = PCI_CFG_SPACE_SIZE;
+	if (pos + nbytes > PCI_CFG_SPACE_SIZE)
+		nbytes = PCI_CFG_SPACE_SIZE - pos;
+	cnt = nbytes;
+
+	if (!access_ok(VERIFY_READ, buf, cnt))
+		return -EINVAL;
+
+	if ((pos & 1) && cnt) {
+		unsigned char val;
+		__get_user(val, buf);
+		pcibios_write_config_byte(bus, dfn, pos, val);
+		buf++;
+		pos++;
+		cnt--;
+	}
+
+	if ((pos & 3) && cnt > 2) {
+		unsigned short val;
+		__get_user(val, (unsigned short *) buf);
+		pcibios_write_config_word(bus, dfn, pos, le16_to_cpu(val));
+		buf += 2;
+		pos += 2;
+		cnt -= 2;
+	}
+
+	while (cnt >= 4) {
+		unsigned int val;
+		__get_user(val, (unsigned int *) buf);
+		pcibios_write_config_dword(bus, dfn, pos, le32_to_cpu(val));
+		buf += 4;
+		pos += 4;
+		cnt -= 4;
+	}
+
+	if (cnt >= 2) {
+		unsigned short val;
+		__get_user(val, (unsigned short *) buf);
+		pcibios_write_config_word(bus, dfn, pos, le16_to_cpu(val));
+		buf += 2;
+		pos += 2;
+		cnt -= 2;
+	}
+
+	if (cnt) {
+		unsigned char val;
+		__get_user(val, buf);
+		pcibios_write_config_byte(bus, dfn, pos, val);
+		buf++;
+		pos++;
+		cnt--;
+	}
+
+	*ppos = pos;
+	return nbytes;
+}
+
+static struct file_operations proc_bus_pci_operations = {
+	proc_bus_pci_lseek,
+	proc_bus_pci_read,
+	proc_bus_pci_write,
+	NULL,		/* readdir */
+	NULL,		/* poll */
+	NULL,		/* ioctl */
+	NULL,		/* mmap */
+	NULL,		/* no special open code */
+	NULL,		/* no special release code */
+	NULL		/* can't fsync */
+};
+
+static struct inode_operations proc_bus_pci_inode_operations = {
+	&proc_bus_pci_operations, /* default base directory file-ops */
+	NULL,			/* create */
+	NULL,			/* lookup */
+	NULL,			/* link */
+	NULL,			/* unlink */
+	NULL,			/* symlink */
+	NULL,			/* mkdir */
+	NULL,			/* rmdir */
+	NULL,			/* mknod */
+	NULL,			/* rename */
+	NULL,			/* readlink */
+	NULL,			/* follow_link */
+	NULL,			/* readpage */
+	NULL,			/* writepage */
+	NULL,			/* bmap */
+	NULL,			/* truncate */
+	NULL			/* permission */
+};
+
+int
+get_pci_dev_info(char *buf, char **start, off_t pos, int count, int wr)
+{
+	struct pci_dev *dev = pci_devices;
+	off_t at = 0;
+	int len, i, cnt;
+
+	cnt = 0;
+	while (dev && count > cnt) {
+		len = sprintf(buf, "%02x%02x\t%04x%04x\t%x",
+			dev->bus->number,
+			dev->devfn,
+			dev->vendor,
+			dev->device,
+			dev->irq);
+		for(i=0; i<6; i++)
+			len += sprintf(buf+len,
+#if BITS_PER_LONG == 32
+						"\t%08lx",
+#else
+						"\t%016lx",
+#endif
+					dev->base_address[i]);
+		buf[len++] = '\n';
+		at += len;
+		if (at >= pos) {
+			if (!*start) {
+				*start = buf + (pos - (at - len));
+				cnt = at - pos;
+			} else
+				cnt += len;
+			buf += len;
+		}
+		dev = dev->next;
+	}
+	return (count > cnt) ? cnt : count;
+}
+
+static struct proc_dir_entry proc_pci_devices = {
+	PROC_BUS_PCI_DEVICES, 7, "devices",
+	S_IFREG | S_IRUGO, 1, 0, 0,
+	0, &proc_array_inode_operations,
+	get_pci_dev_info
+};
+
+__initfunc(void proc_bus_pci_init(void))
+{
+	struct proc_dir_entry *proc_pci;
+	struct pci_bus *bus;
+
+	if (!pcibios_present())
+		return;
+	proc_pci = create_proc_entry("pci", S_IFDIR, proc_bus);
+	proc_register(proc_pci, &proc_pci_devices);
+	for(bus = &pci_root; bus; bus = bus->next) {
+		char name[16];
+		struct proc_dir_entry *de;
+		struct pci_dev *dev;
+
+		sprintf(name, "%02x", bus->number);
+		de = create_proc_entry(name, S_IFDIR, proc_pci);
+		for(dev = bus->devices; dev; dev = dev->sibling) {
+			struct proc_dir_entry *e;
+
+			sprintf(name, "%02x.%x",
+				PCI_SLOT(dev->devfn),
+				PCI_FUNC(dev->devfn));
+			e = create_proc_entry(name, S_IFREG | S_IRUGO | S_IWUSR, de);
+			e->ops = &proc_bus_pci_inode_operations;
+			e->data = dev;
+			e->size = PCI_CFG_SPACE_SIZE;
+		}
+	}
+}