451 lines
9.3 KiB
C
451 lines
9.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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/slab.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/capability.h>
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#include <linux/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 proc_bus_pci_lseek(struct file *file, loff_t off, int whence)
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{
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struct pci_dev *dev = PDE_DATA(file_inode(file));
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return fixed_size_llseek(file, off, whence, dev->cfg_size);
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}
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static ssize_t proc_bus_pci_read(struct file *file, char __user *buf,
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size_t nbytes, loff_t *ppos)
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{
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struct pci_dev *dev = PDE_DATA(file_inode(file));
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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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pci_config_pm_runtime_get(dev);
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if ((pos & 1) && cnt) {
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unsigned char val;
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pci_user_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_user_read_config_word(dev, pos, &val);
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__put_user(cpu_to_le16(val), (__le16 __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_user_read_config_dword(dev, pos, &val);
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__put_user(cpu_to_le32(val), (__le32 __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_user_read_config_word(dev, pos, &val);
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__put_user(cpu_to_le16(val), (__le16 __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_user_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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pci_config_pm_runtime_put(dev);
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*ppos = pos;
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return nbytes;
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}
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static ssize_t proc_bus_pci_write(struct file *file, const char __user *buf,
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size_t nbytes, loff_t *ppos)
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{
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struct inode *ino = file_inode(file);
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struct pci_dev *dev = PDE_DATA(ino);
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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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pci_config_pm_runtime_get(dev);
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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_user_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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__le16 val;
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__get_user(val, (__le16 __user *) buf);
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pci_user_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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__le32 val;
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__get_user(val, (__le32 __user *) buf);
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pci_user_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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__le16 val;
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__get_user(val, (__le16 __user *) buf);
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pci_user_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_user_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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pci_config_pm_runtime_put(dev);
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*ppos = pos;
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i_size_write(ino, dev->cfg_size);
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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 long proc_bus_pci_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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struct pci_dev *dev = PDE_DATA(file_inode(file));
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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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if (!arch_can_pci_mmap_io())
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return -EINVAL;
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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 (arch_can_pci_mmap_wc()) {
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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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}
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/* If arch decided it can't, fall through... */
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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 pci_dev *dev = PDE_DATA(file_inode(file));
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struct pci_filp_private *fpriv = file->private_data;
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int i, ret, write_combine = 0, res_bit = IORESOURCE_MEM;
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if (!capable(CAP_SYS_RAWIO))
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return -EPERM;
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if (fpriv->mmap_state == pci_mmap_io) {
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if (!arch_can_pci_mmap_io())
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return -EINVAL;
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res_bit = IORESOURCE_IO;
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}
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/* Make sure the caller is mapping a real resource for this device */
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for (i = 0; i < PCI_ROM_RESOURCE; i++) {
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if (dev->resource[i].flags & res_bit &&
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pci_mmap_fits(dev, i, vma, PCI_MMAP_PROCFS))
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break;
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}
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if (i >= PCI_ROM_RESOURCE)
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return -ENODEV;
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if (fpriv->mmap_state == pci_mmap_mem &&
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fpriv->write_combine) {
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if (dev->resource[i].flags & IORESOURCE_PREFETCH)
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write_combine = 1;
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else
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return -EINVAL;
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}
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ret = pci_mmap_page_range(dev, i, vma,
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fpriv->mmap_state, 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 const struct file_operations proc_bus_pci_operations = {
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.owner = THIS_MODULE,
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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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.unlocked_ioctl = proc_bus_pci_ioctl,
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.compat_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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/* 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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/* only print standard and ROM resources to preserve compatibility */
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for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
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resource_size_t start, end;
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pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
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seq_printf(m, "\t%16llx",
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(unsigned long 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 <= PCI_ROM_RESOURCE; i++) {
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resource_size_t start, end;
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pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
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seq_printf(m, "\t%16llx",
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dev->resource[i].start < dev->resource[i].end ?
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(unsigned long 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 const 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 = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir,
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&proc_bus_pci_operations, dev);
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if (!e)
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return -ENOMEM;
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proc_set_size(e, 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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proc_remove(dev->procent);
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dev->procent = NULL;
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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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proc_remove(bus->procdir);
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return 0;
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}
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static int __init pci_proc_init(void)
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{
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struct pci_dev *dev = NULL;
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proc_bus_pci_dir = proc_mkdir("bus/pci", NULL);
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proc_create_seq("devices", 0, proc_bus_pci_dir,
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&proc_bus_pci_devices_op);
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proc_initialized = 1;
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for_each_pci_dev(dev)
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pci_proc_attach_device(dev);
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return 0;
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}
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device_initcall(pci_proc_init);
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