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![Michael Ellerman](/assets/img/avatar_default.png)
This is an updated version of Ben's fix-pci-mmap-on-ppc-and-ppc64.patch which is in 2.6.12-rc4-mm1. It fixes the patch to work on PPC iSeries, removes some debug printks at Ben's request, and incorporates your fix-pci-mmap-on-ppc-and-ppc64-fix.patch also. Originally from Benjamin Herrenschmidt <benh@kernel.crashing.org> This patch was discussed at length on linux-pci and so far, the last iteration of it didn't raise any comment. It's effect is a nop on architecture that don't define the new pci_resource_to_user() callback anyway. It allows architecture like ppc who put weird things inside of PCI resource structures to convert to some different value for user visible ones. It also fixes mmap'ing of IO space on those archs. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
626 lines
13 KiB
C
626 lines
13 KiB
C
/*
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* $Id: proc.c,v 1.13 1998/05/12 07:36:07 mj Exp $
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*
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* Procfs interface for the PCI bus.
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*
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* Copyright (c) 1997--1999 Martin Mares <mj@ucw.cz>
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*/
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/module.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/smp_lock.h>
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#include <asm/uaccess.h>
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#include <asm/byteorder.h>
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#include "pci.h"
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static int proc_initialized; /* = 0 */
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static loff_t
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proc_bus_pci_lseek(struct file *file, loff_t off, int whence)
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{
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loff_t new = -1;
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struct inode *inode = file->f_dentry->d_inode;
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down(&inode->i_sem);
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switch (whence) {
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case 0:
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new = off;
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break;
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case 1:
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new = file->f_pos + off;
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break;
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case 2:
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new = inode->i_size + off;
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break;
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}
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if (new < 0 || new > inode->i_size)
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new = -EINVAL;
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else
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file->f_pos = new;
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up(&inode->i_sem);
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return new;
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}
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static ssize_t
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proc_bus_pci_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
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{
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const struct inode *ino = file->f_dentry->d_inode;
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const struct proc_dir_entry *dp = PDE(ino);
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struct pci_dev *dev = dp->data;
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unsigned int pos = *ppos;
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unsigned int cnt, size;
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/*
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* Normal users can read only the standardized portion of the
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* configuration space as several chips lock up when trying to read
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* undefined locations (think of Intel PIIX4 as a typical example).
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*/
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if (capable(CAP_SYS_ADMIN))
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size = dev->cfg_size;
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else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
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size = 128;
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else
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size = 64;
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if (pos >= size)
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return 0;
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if (nbytes >= size)
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nbytes = size;
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if (pos + nbytes > size)
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nbytes = size - pos;
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cnt = nbytes;
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if (!access_ok(VERIFY_WRITE, buf, cnt))
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return -EINVAL;
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if ((pos & 1) && cnt) {
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unsigned char val;
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pci_read_config_byte(dev, pos, &val);
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__put_user(val, buf);
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buf++;
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pos++;
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cnt--;
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}
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if ((pos & 3) && cnt > 2) {
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unsigned short val;
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pci_read_config_word(dev, pos, &val);
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__put_user(cpu_to_le16(val), (unsigned short __user *) buf);
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buf += 2;
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pos += 2;
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cnt -= 2;
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}
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while (cnt >= 4) {
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unsigned int val;
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pci_read_config_dword(dev, pos, &val);
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__put_user(cpu_to_le32(val), (unsigned int __user *) buf);
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buf += 4;
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pos += 4;
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cnt -= 4;
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}
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if (cnt >= 2) {
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unsigned short val;
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pci_read_config_word(dev, pos, &val);
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__put_user(cpu_to_le16(val), (unsigned short __user *) buf);
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buf += 2;
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pos += 2;
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cnt -= 2;
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}
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if (cnt) {
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unsigned char val;
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pci_read_config_byte(dev, pos, &val);
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__put_user(val, buf);
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buf++;
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pos++;
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cnt--;
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}
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*ppos = pos;
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return nbytes;
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}
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static ssize_t
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proc_bus_pci_write(struct file *file, const char __user *buf, size_t nbytes, loff_t *ppos)
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{
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const struct inode *ino = file->f_dentry->d_inode;
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const struct proc_dir_entry *dp = PDE(ino);
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struct pci_dev *dev = dp->data;
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int pos = *ppos;
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int size = dev->cfg_size;
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int cnt;
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if (pos >= size)
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return 0;
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if (nbytes >= size)
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nbytes = size;
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if (pos + nbytes > size)
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nbytes = size - pos;
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cnt = nbytes;
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if (!access_ok(VERIFY_READ, buf, cnt))
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return -EINVAL;
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if ((pos & 1) && cnt) {
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unsigned char val;
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__get_user(val, buf);
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pci_write_config_byte(dev, pos, val);
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buf++;
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pos++;
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cnt--;
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}
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if ((pos & 3) && cnt > 2) {
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unsigned short val;
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__get_user(val, (unsigned short __user *) buf);
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pci_write_config_word(dev, pos, le16_to_cpu(val));
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buf += 2;
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pos += 2;
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cnt -= 2;
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}
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while (cnt >= 4) {
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unsigned int val;
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__get_user(val, (unsigned int __user *) buf);
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pci_write_config_dword(dev, pos, le32_to_cpu(val));
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buf += 4;
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pos += 4;
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cnt -= 4;
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}
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if (cnt >= 2) {
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unsigned short val;
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__get_user(val, (unsigned short __user *) buf);
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pci_write_config_word(dev, pos, le16_to_cpu(val));
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buf += 2;
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pos += 2;
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cnt -= 2;
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}
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if (cnt) {
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unsigned char val;
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__get_user(val, buf);
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pci_write_config_byte(dev, pos, val);
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buf++;
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pos++;
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cnt--;
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}
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*ppos = pos;
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return nbytes;
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}
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struct pci_filp_private {
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enum pci_mmap_state mmap_state;
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int write_combine;
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};
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static int proc_bus_pci_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
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{
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const struct proc_dir_entry *dp = PDE(inode);
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struct pci_dev *dev = dp->data;
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#ifdef HAVE_PCI_MMAP
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struct pci_filp_private *fpriv = file->private_data;
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#endif /* HAVE_PCI_MMAP */
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int ret = 0;
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switch (cmd) {
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case PCIIOC_CONTROLLER:
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ret = pci_domain_nr(dev->bus);
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break;
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#ifdef HAVE_PCI_MMAP
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case PCIIOC_MMAP_IS_IO:
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fpriv->mmap_state = pci_mmap_io;
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break;
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case PCIIOC_MMAP_IS_MEM:
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fpriv->mmap_state = pci_mmap_mem;
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break;
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case PCIIOC_WRITE_COMBINE:
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if (arg)
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fpriv->write_combine = 1;
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else
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fpriv->write_combine = 0;
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break;
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#endif /* HAVE_PCI_MMAP */
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default:
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ret = -EINVAL;
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break;
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};
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return ret;
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}
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#ifdef HAVE_PCI_MMAP
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static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
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{
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struct inode *inode = file->f_dentry->d_inode;
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const struct proc_dir_entry *dp = PDE(inode);
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struct pci_dev *dev = dp->data;
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struct pci_filp_private *fpriv = file->private_data;
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int ret;
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if (!capable(CAP_SYS_RAWIO))
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return -EPERM;
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ret = pci_mmap_page_range(dev, vma,
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fpriv->mmap_state,
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fpriv->write_combine);
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if (ret < 0)
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return ret;
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return 0;
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}
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static int proc_bus_pci_open(struct inode *inode, struct file *file)
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{
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struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL);
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if (!fpriv)
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return -ENOMEM;
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fpriv->mmap_state = pci_mmap_io;
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fpriv->write_combine = 0;
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file->private_data = fpriv;
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return 0;
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}
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static int proc_bus_pci_release(struct inode *inode, struct file *file)
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{
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kfree(file->private_data);
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file->private_data = NULL;
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return 0;
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}
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#endif /* HAVE_PCI_MMAP */
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static struct file_operations proc_bus_pci_operations = {
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.llseek = proc_bus_pci_lseek,
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.read = proc_bus_pci_read,
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.write = proc_bus_pci_write,
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.ioctl = proc_bus_pci_ioctl,
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#ifdef HAVE_PCI_MMAP
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.open = proc_bus_pci_open,
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.release = proc_bus_pci_release,
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.mmap = proc_bus_pci_mmap,
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#ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA
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.get_unmapped_area = get_pci_unmapped_area,
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#endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */
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#endif /* HAVE_PCI_MMAP */
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};
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#if BITS_PER_LONG == 32
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#define LONG_FORMAT "\t%08lx"
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#else
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#define LONG_FORMAT "\t%16lx"
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#endif
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/* iterator */
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static void *pci_seq_start(struct seq_file *m, loff_t *pos)
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{
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struct pci_dev *dev = NULL;
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loff_t n = *pos;
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for_each_pci_dev(dev) {
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if (!n--)
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break;
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}
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return dev;
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}
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static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos)
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{
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struct pci_dev *dev = v;
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(*pos)++;
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dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
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return dev;
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}
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static void pci_seq_stop(struct seq_file *m, void *v)
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{
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if (v) {
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struct pci_dev *dev = v;
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pci_dev_put(dev);
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}
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}
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static int show_device(struct seq_file *m, void *v)
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{
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const struct pci_dev *dev = v;
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const struct pci_driver *drv;
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int i;
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if (dev == NULL)
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return 0;
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drv = pci_dev_driver(dev);
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seq_printf(m, "%02x%02x\t%04x%04x\t%x",
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dev->bus->number,
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dev->devfn,
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dev->vendor,
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dev->device,
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dev->irq);
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/* Here should be 7 and not PCI_NUM_RESOURCES as we need to preserve compatibility */
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for (i=0; i<7; i++) {
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u64 start, end;
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pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
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seq_printf(m, LONG_FORMAT,
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((unsigned long)start) |
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(dev->resource[i].flags & PCI_REGION_FLAG_MASK));
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}
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for (i=0; i<7; i++) {
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u64 start, end;
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pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
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seq_printf(m, LONG_FORMAT,
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dev->resource[i].start < dev->resource[i].end ?
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(unsigned long)(end - start) + 1 : 0);
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}
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seq_putc(m, '\t');
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if (drv)
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seq_printf(m, "%s", drv->name);
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seq_putc(m, '\n');
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return 0;
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}
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static struct seq_operations proc_bus_pci_devices_op = {
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.start = pci_seq_start,
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.next = pci_seq_next,
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.stop = pci_seq_stop,
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.show = show_device
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};
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static struct proc_dir_entry *proc_bus_pci_dir;
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int pci_proc_attach_device(struct pci_dev *dev)
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{
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struct pci_bus *bus = dev->bus;
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struct proc_dir_entry *e;
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char name[16];
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if (!proc_initialized)
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return -EACCES;
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if (!bus->procdir) {
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if (pci_proc_domain(bus)) {
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sprintf(name, "%04x:%02x", pci_domain_nr(bus),
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bus->number);
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} else {
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sprintf(name, "%02x", bus->number);
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}
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bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
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if (!bus->procdir)
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return -ENOMEM;
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}
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sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
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e = create_proc_entry(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir);
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if (!e)
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return -ENOMEM;
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e->proc_fops = &proc_bus_pci_operations;
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e->data = dev;
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e->size = dev->cfg_size;
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dev->procent = e;
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return 0;
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}
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int pci_proc_detach_device(struct pci_dev *dev)
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{
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struct proc_dir_entry *e;
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if ((e = dev->procent)) {
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if (atomic_read(&e->count))
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return -EBUSY;
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remove_proc_entry(e->name, dev->bus->procdir);
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dev->procent = NULL;
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}
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return 0;
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}
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int pci_proc_attach_bus(struct pci_bus* bus)
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{
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struct proc_dir_entry *de = bus->procdir;
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if (!proc_initialized)
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return -EACCES;
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if (!de) {
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char name[16];
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sprintf(name, "%02x", bus->number);
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de = bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
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if (!de)
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return -ENOMEM;
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}
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return 0;
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}
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int pci_proc_detach_bus(struct pci_bus* bus)
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{
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struct proc_dir_entry *de = bus->procdir;
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if (de)
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remove_proc_entry(de->name, proc_bus_pci_dir);
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return 0;
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}
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#ifdef CONFIG_PCI_LEGACY_PROC
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/*
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* Backward compatible /proc/pci interface.
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*/
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/*
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* Convert some of the configuration space registers of the device at
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* address (bus,devfn) into a string (possibly several lines each).
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* The configuration string is stored starting at buf[len]. If the
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* string would exceed the size of the buffer (SIZE), 0 is returned.
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*/
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static int show_dev_config(struct seq_file *m, void *v)
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{
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struct pci_dev *dev = v;
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struct pci_dev *first_dev;
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struct pci_driver *drv;
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u32 class_rev;
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unsigned char latency, min_gnt, max_lat, *class;
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int reg;
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first_dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL);
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if (dev == first_dev)
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seq_puts(m, "PCI devices found:\n");
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pci_dev_put(first_dev);
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drv = pci_dev_driver(dev);
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pci_read_config_dword(dev, PCI_CLASS_REVISION, &class_rev);
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pci_read_config_byte (dev, PCI_LATENCY_TIMER, &latency);
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pci_read_config_byte (dev, PCI_MIN_GNT, &min_gnt);
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pci_read_config_byte (dev, PCI_MAX_LAT, &max_lat);
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seq_printf(m, " Bus %2d, device %3d, function %2d:\n",
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dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
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class = pci_class_name(class_rev >> 16);
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if (class)
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seq_printf(m, " %s", class);
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else
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seq_printf(m, " Class %04x", class_rev >> 16);
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#ifdef CONFIG_PCI_NAMES
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seq_printf(m, ": %s", dev->pretty_name);
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#else
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seq_printf(m, ": PCI device %04x:%04x", dev->vendor, dev->device);
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#endif
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seq_printf(m, " (rev %d).\n", class_rev & 0xff);
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if (dev->irq)
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seq_printf(m, " IRQ %d.\n", dev->irq);
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if (latency || min_gnt || max_lat) {
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seq_printf(m, " Master Capable. ");
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if (latency)
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seq_printf(m, "Latency=%d. ", latency);
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else
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seq_puts(m, "No bursts. ");
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if (min_gnt)
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seq_printf(m, "Min Gnt=%d.", min_gnt);
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if (max_lat)
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seq_printf(m, "Max Lat=%d.", max_lat);
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seq_putc(m, '\n');
|
|
}
|
|
|
|
for (reg = 0; reg < 6; reg++) {
|
|
struct resource *res = dev->resource + reg;
|
|
unsigned long base, end, flags;
|
|
|
|
base = res->start;
|
|
end = res->end;
|
|
flags = res->flags;
|
|
if (!end)
|
|
continue;
|
|
|
|
if (flags & PCI_BASE_ADDRESS_SPACE_IO) {
|
|
seq_printf(m, " I/O at 0x%lx [0x%lx].\n",
|
|
base, end);
|
|
} else {
|
|
const char *pref, *type = "unknown";
|
|
|
|
if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH)
|
|
pref = "P";
|
|
else
|
|
pref = "Non-p";
|
|
switch (flags & PCI_BASE_ADDRESS_MEM_TYPE_MASK) {
|
|
case PCI_BASE_ADDRESS_MEM_TYPE_32:
|
|
type = "32 bit"; break;
|
|
case PCI_BASE_ADDRESS_MEM_TYPE_1M:
|
|
type = "20 bit"; break;
|
|
case PCI_BASE_ADDRESS_MEM_TYPE_64:
|
|
type = "64 bit"; break;
|
|
}
|
|
seq_printf(m, " %srefetchable %s memory at "
|
|
"0x%lx [0x%lx].\n", pref, type,
|
|
base,
|
|
end);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct seq_operations proc_pci_op = {
|
|
.start = pci_seq_start,
|
|
.next = pci_seq_next,
|
|
.stop = pci_seq_stop,
|
|
.show = show_dev_config
|
|
};
|
|
|
|
static int proc_pci_open(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &proc_pci_op);
|
|
}
|
|
static struct file_operations proc_pci_operations = {
|
|
.open = proc_pci_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release,
|
|
};
|
|
|
|
static void legacy_proc_init(void)
|
|
{
|
|
struct proc_dir_entry * entry = create_proc_entry("pci", 0, NULL);
|
|
if (entry)
|
|
entry->proc_fops = &proc_pci_operations;
|
|
}
|
|
|
|
#else
|
|
|
|
static void legacy_proc_init(void)
|
|
{
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_PCI_LEGACY_PROC */
|
|
|
|
static int proc_bus_pci_dev_open(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &proc_bus_pci_devices_op);
|
|
}
|
|
static struct file_operations proc_bus_pci_dev_operations = {
|
|
.open = proc_bus_pci_dev_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release,
|
|
};
|
|
|
|
static int __init pci_proc_init(void)
|
|
{
|
|
struct proc_dir_entry *entry;
|
|
struct pci_dev *dev = NULL;
|
|
proc_bus_pci_dir = proc_mkdir("pci", proc_bus);
|
|
entry = create_proc_entry("devices", 0, proc_bus_pci_dir);
|
|
if (entry)
|
|
entry->proc_fops = &proc_bus_pci_dev_operations;
|
|
proc_initialized = 1;
|
|
while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
|
|
pci_proc_attach_device(dev);
|
|
}
|
|
legacy_proc_init();
|
|
return 0;
|
|
}
|
|
|
|
__initcall(pci_proc_init);
|
|
|
|
#ifdef CONFIG_HOTPLUG
|
|
EXPORT_SYMBOL(pci_proc_attach_device);
|
|
EXPORT_SYMBOL(pci_proc_attach_bus);
|
|
EXPORT_SYMBOL(pci_proc_detach_bus);
|
|
#endif
|
|
|