linux/drivers/pci/proc.c
Linus Torvalds ac08b1c68d pci-v5.15-changes
-----BEGIN PGP SIGNATURE-----
 
 iQJIBAABCgAyFiEEgMe7l+5h9hnxdsnuWYigwDrT+vwFAmE3jjYUHGJoZWxnYWFz
 QGdvb2dsZS5jb20ACgkQWYigwDrT+vwrIA/8DYHYRQ6tR3lY0ZxVeBdnd/ryp/ag
 z35N8RFLPaFlifLWSldwDV/8dylXnRjS57WS9sppp5gKsLl6xYySvTeMpt5QHdXd
 gJw27sBqiBmecUGFHWVp9B3yF2LvgrtItjd9RadYaHhWEfWyB5AFK7qwxx02fzvo
 hoGA2XbpI/Hb1BvSOi1avmPYgly1BRu8RFvKMwB2cxQNv3TZOnekT/iFK5WVR1o2
 Z5BA+0nj9PrDO/axS0Vh+TqXhU+hOGox7bkOMcNmbDV7Yo8hgot5SsxddbZqJX+O
 BNNrRv72pbHGIwT/vOP7OQ49sRXledHYeyEGIixjLylBcROk9t8M1z1sfgJ6obVy
 1eM3TIx/+7OS5dxC+gTNMVgUiL1NQIdA1LVIBb0BrXm6yNqNxBlj3o/gQ+VGEiNI
 0lATmpe4P/N0/cOSI7tK9O2zsX3qzbLnJxsseGrwtK1L+GRYMUPhP4ciblhB0CIf
 BmK9j0ROmCBGN0Pz/5wIaQgkTro74dqO1BPX8n84M8KWByNZwTrJo/rCBdD4DGaJ
 eJvyt3hoYxhSxRQ1rp3zqZ9ytm4dJBGcZBKeO1IvKvJHEzfZBIqqq3M/hlNIaSDP
 v+8I9HaS1kI4SDB1Ia0LFRqKqvpN+WVLB+EoGkeDQozPO42tYSb43lYe83sEnZ+T
 KY0a/5feu975eLs=
 =g1WT
 -----END PGP SIGNATURE-----

Merge tag 'pci-v5.15-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci

Pull PCI updates from Bjorn Helgaas:
 "Enumeration:
   - Convert controller drivers to generic_handle_domain_irq() (Marc
     Zyngier)
   - Simplify VPD (Vital Product Data) access and search (Heiner
     Kallweit)
   - Update bnx2, bnx2x, bnxt, cxgb4, cxlflash, sfc, tg3 drivers to use
     simplified VPD interfaces (Heiner Kallweit)
   - Run Max Payload Size quirks before configuring MPS; work around
     ASMedia ASM1062 SATA MPS issue (Marek Behún)

  Resource management:
   - Refactor pci_ioremap_bar() and pci_ioremap_wc_bar() (Krzysztof
     Wilczyński)
   - Optimize pci_resource_len() to reduce kernel size (Zhen Lei)

  PCI device hotplug:
   - Fix a double unmap in ibmphp (Vishal Aslot)

  PCIe port driver:
   - Enable Bandwidth Notification only if port supports it (Stuart
     Hayes)

  Sysfs/proc/syscalls:
   - Add schedule point in proc_bus_pci_read() (Krzysztof Wilczyński)
   - Return ~0 data on pciconfig_read() CAP_SYS_ADMIN failure (Krzysztof
     Wilczyński)
   - Return "int" from pciconfig_read() syscall (Krzysztof Wilczyński)

  Virtualization:
   - Extend "pci=noats" to also turn on Translation Blocking to protect
     against some DMA attacks (Alex Williamson)
   - Add sysfs mechanism to control the type of reset used between
     device assignments to VMs (Amey Narkhede)
   - Add support for ACPI _RST reset method (Shanker Donthineni)
   - Add ACS quirks for Cavium multi-function devices (George Cherian)
   - Add ACS quirks for NXP LX2xx0 and LX2xx2 platforms (Wasim Khan)
   - Allow HiSilicon AMBA devices that appear as fake PCI devices to use
     PASID and SVA (Zhangfei Gao)

  Endpoint framework:
   - Add support for SR-IOV Endpoint devices (Kishon Vijay Abraham I)
   - Zero-initialize endpoint test tool parameters so we don't use
     random parameters (Shunyong Yang)

  APM X-Gene PCIe controller driver:
   - Remove redundant dev_err() call in xgene_msi_probe() (ErKun Yang)

  Broadcom iProc PCIe controller driver:
   - Don't fail devm_pci_alloc_host_bridge() on missing 'ranges' because
     it's optional on BCMA devices (Rob Herring)
   - Fix BCMA probe resource handling (Rob Herring)

  Cadence PCIe driver:
   - Work around J7200 Link training electrical issue by increasing
     delays in LTSSM (Nadeem Athani)

  Intel IXP4xx PCI controller driver:
   - Depend on ARCH_IXP4XX to avoid useless config questions (Geert
     Uytterhoeven)

  Intel Keembay PCIe controller driver:
   - Add Intel Keem Bay PCIe controller (Srikanth Thokala)

  Marvell Aardvark PCIe controller driver:
   - Work around config space completion handling issues (Evan Wang)
   - Increase timeout for config access completions (Pali Rohár)
   - Emulate CRS Software Visibility bit (Pali Rohár)
   - Configure resources from DT 'ranges' property to fix I/O space
     access (Pali Rohár)
   - Serialize INTx mask/unmask (Pali Rohár)

  MediaTek PCIe controller driver:
   - Add MT7629 support in DT (Chuanjia Liu)
   - Fix an MSI issue (Chuanjia Liu)
   - Get syscon regmap ("mediatek,generic-pciecfg"), IRQ number
     ("pci_irq"), PCI domain ("linux,pci-domain") from DT properties if
     present (Chuanjia Liu)

  Microsoft Hyper-V host bridge driver:
   - Add ARM64 support (Boqun Feng)
   - Support "Create Interrupt v3" message (Sunil Muthuswamy)

  NVIDIA Tegra PCIe controller driver:
   - Use seq_puts(), move err_msg from stack to static, fix OF node leak
     (Christophe JAILLET)

  NVIDIA Tegra194 PCIe driver:
   - Disable suspend when in Endpoint mode (Om Prakash Singh)
   - Fix MSI-X address programming error (Om Prakash Singh)
   - Disable interrupts during suspend to avoid spurious AER link down
     (Om Prakash Singh)

  Renesas R-Car PCIe controller driver:
   - Work around hardware issue that prevents Link L1->L0 transition
     (Marek Vasut)
   - Fix runtime PM refcount leak (Dinghao Liu)

  Rockchip DesignWare PCIe controller driver:
   - Add Rockchip RK356X host controller driver (Simon Xue)

  TI J721E PCIe driver:
   - Add support for J7200 and AM64 (Kishon Vijay Abraham I)

  Toshiba Visconti PCIe controller driver:
   - Add Toshiba Visconti PCIe host controller driver (Nobuhiro
     Iwamatsu)

  Xilinx NWL PCIe controller driver:
   - Enable PCIe reference clock via CCF (Hyun Kwon)

  Miscellaneous:
   - Convert sta2x11 from 'pci_' to 'dma_' API (Christophe JAILLET)
   - Fix pci_dev_str_match_path() alloc while atomic bug (used for
     kernel parameters that specify devices) (Dan Carpenter)
   - Remove pointless Precision Time Management warning when PTM is
     present but not enabled (Jakub Kicinski)
   - Remove surplus "break" statements (Krzysztof Wilczyński)"

* tag 'pci-v5.15-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: (132 commits)
  PCI: ibmphp: Fix double unmap of io_mem
  x86/PCI: sta2x11: switch from 'pci_' to 'dma_' API
  PCI/VPD: Use unaligned access helpers
  PCI/VPD: Clean up public VPD defines and inline functions
  cxgb4: Use pci_vpd_find_id_string() to find VPD ID string
  PCI/VPD: Add pci_vpd_find_id_string()
  PCI/VPD: Include post-processing in pci_vpd_find_tag()
  PCI/VPD: Stop exporting pci_vpd_find_info_keyword()
  PCI/VPD: Stop exporting pci_vpd_find_tag()
  PCI: Set dma-can-stall for HiSilicon chips
  PCI: rockchip-dwc: Add Rockchip RK356X host controller driver
  PCI: dwc: Remove surplus break statement after return
  PCI: artpec6: Remove local code block from switch statement
  PCI: artpec6: Remove surplus break statement after return
  MAINTAINERS: Add entries for Toshiba Visconti PCIe controller
  PCI: visconti: Add Toshiba Visconti PCIe host controller driver
  PCI/portdrv: Enable Bandwidth Notification only if port supports it
  PCI: Allow PASID on fake PCIe devices without TLP prefixes
  PCI: mediatek: Use PCI domain to handle ports detection
  PCI: mediatek: Add new method to get irq number
  ...
2021-09-07 19:13:42 -07:00

470 lines
9.7 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Procfs interface for the PCI bus
*
* Copyright (c) 1997--1999 Martin Mares <mj@ucw.cz>
*/
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/capability.h>
#include <linux/uaccess.h>
#include <linux/security.h>
#include <asm/byteorder.h>
#include "pci.h"
static int proc_initialized; /* = 0 */
static loff_t proc_bus_pci_lseek(struct file *file, loff_t off, int whence)
{
struct pci_dev *dev = PDE_DATA(file_inode(file));
return fixed_size_llseek(file, off, whence, dev->cfg_size);
}
static ssize_t proc_bus_pci_read(struct file *file, char __user *buf,
size_t nbytes, loff_t *ppos)
{
struct pci_dev *dev = PDE_DATA(file_inode(file));
unsigned int pos = *ppos;
unsigned int cnt, size;
/*
* Normal users can read only the standardized portion of the
* configuration space as several chips lock up when trying to read
* undefined locations (think of Intel PIIX4 as a typical example).
*/
if (capable(CAP_SYS_ADMIN))
size = dev->cfg_size;
else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
size = 128;
else
size = 64;
if (pos >= size)
return 0;
if (nbytes >= size)
nbytes = size;
if (pos + nbytes > size)
nbytes = size - pos;
cnt = nbytes;
if (!access_ok(buf, cnt))
return -EINVAL;
pci_config_pm_runtime_get(dev);
if ((pos & 1) && cnt) {
unsigned char val;
pci_user_read_config_byte(dev, pos, &val);
__put_user(val, buf);
buf++;
pos++;
cnt--;
}
if ((pos & 3) && cnt > 2) {
unsigned short val;
pci_user_read_config_word(dev, pos, &val);
__put_user(cpu_to_le16(val), (__le16 __user *) buf);
buf += 2;
pos += 2;
cnt -= 2;
}
while (cnt >= 4) {
unsigned int val;
pci_user_read_config_dword(dev, pos, &val);
__put_user(cpu_to_le32(val), (__le32 __user *) buf);
buf += 4;
pos += 4;
cnt -= 4;
cond_resched();
}
if (cnt >= 2) {
unsigned short val;
pci_user_read_config_word(dev, pos, &val);
__put_user(cpu_to_le16(val), (__le16 __user *) buf);
buf += 2;
pos += 2;
cnt -= 2;
}
if (cnt) {
unsigned char val;
pci_user_read_config_byte(dev, pos, &val);
__put_user(val, buf);
buf++;
pos++;
cnt--;
}
pci_config_pm_runtime_put(dev);
*ppos = pos;
return nbytes;
}
static ssize_t proc_bus_pci_write(struct file *file, const char __user *buf,
size_t nbytes, loff_t *ppos)
{
struct inode *ino = file_inode(file);
struct pci_dev *dev = PDE_DATA(ino);
int pos = *ppos;
int size = dev->cfg_size;
int cnt, ret;
ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
if (ret)
return ret;
if (pos >= size)
return 0;
if (nbytes >= size)
nbytes = size;
if (pos + nbytes > size)
nbytes = size - pos;
cnt = nbytes;
if (!access_ok(buf, cnt))
return -EINVAL;
pci_config_pm_runtime_get(dev);
if ((pos & 1) && cnt) {
unsigned char val;
__get_user(val, buf);
pci_user_write_config_byte(dev, pos, val);
buf++;
pos++;
cnt--;
}
if ((pos & 3) && cnt > 2) {
__le16 val;
__get_user(val, (__le16 __user *) buf);
pci_user_write_config_word(dev, pos, le16_to_cpu(val));
buf += 2;
pos += 2;
cnt -= 2;
}
while (cnt >= 4) {
__le32 val;
__get_user(val, (__le32 __user *) buf);
pci_user_write_config_dword(dev, pos, le32_to_cpu(val));
buf += 4;
pos += 4;
cnt -= 4;
}
if (cnt >= 2) {
__le16 val;
__get_user(val, (__le16 __user *) buf);
pci_user_write_config_word(dev, pos, le16_to_cpu(val));
buf += 2;
pos += 2;
cnt -= 2;
}
if (cnt) {
unsigned char val;
__get_user(val, buf);
pci_user_write_config_byte(dev, pos, val);
buf++;
pos++;
cnt--;
}
pci_config_pm_runtime_put(dev);
*ppos = pos;
i_size_write(ino, dev->cfg_size);
return nbytes;
}
struct pci_filp_private {
enum pci_mmap_state mmap_state;
int write_combine;
};
static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
struct pci_dev *dev = PDE_DATA(file_inode(file));
#ifdef HAVE_PCI_MMAP
struct pci_filp_private *fpriv = file->private_data;
#endif /* HAVE_PCI_MMAP */
int ret = 0;
ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
if (ret)
return ret;
switch (cmd) {
case PCIIOC_CONTROLLER:
ret = pci_domain_nr(dev->bus);
break;
#ifdef HAVE_PCI_MMAP
case PCIIOC_MMAP_IS_IO:
if (!arch_can_pci_mmap_io())
return -EINVAL;
fpriv->mmap_state = pci_mmap_io;
break;
case PCIIOC_MMAP_IS_MEM:
fpriv->mmap_state = pci_mmap_mem;
break;
case PCIIOC_WRITE_COMBINE:
if (arch_can_pci_mmap_wc()) {
if (arg)
fpriv->write_combine = 1;
else
fpriv->write_combine = 0;
break;
}
/* If arch decided it can't, fall through... */
fallthrough;
#endif /* HAVE_PCI_MMAP */
default:
ret = -EINVAL;
break;
}
return ret;
}
#ifdef HAVE_PCI_MMAP
static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
{
struct pci_dev *dev = PDE_DATA(file_inode(file));
struct pci_filp_private *fpriv = file->private_data;
int i, ret, write_combine = 0, res_bit = IORESOURCE_MEM;
if (!capable(CAP_SYS_RAWIO) ||
security_locked_down(LOCKDOWN_PCI_ACCESS))
return -EPERM;
if (fpriv->mmap_state == pci_mmap_io) {
if (!arch_can_pci_mmap_io())
return -EINVAL;
res_bit = IORESOURCE_IO;
}
/* Make sure the caller is mapping a real resource for this device */
for (i = 0; i < PCI_STD_NUM_BARS; i++) {
if (dev->resource[i].flags & res_bit &&
pci_mmap_fits(dev, i, vma, PCI_MMAP_PROCFS))
break;
}
if (i >= PCI_STD_NUM_BARS)
return -ENODEV;
if (fpriv->mmap_state == pci_mmap_mem &&
fpriv->write_combine) {
if (dev->resource[i].flags & IORESOURCE_PREFETCH)
write_combine = 1;
else
return -EINVAL;
}
if (dev->resource[i].flags & IORESOURCE_MEM &&
iomem_is_exclusive(dev->resource[i].start))
return -EINVAL;
ret = pci_mmap_page_range(dev, i, vma,
fpriv->mmap_state, write_combine);
if (ret < 0)
return ret;
return 0;
}
static int proc_bus_pci_open(struct inode *inode, struct file *file)
{
struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL);
if (!fpriv)
return -ENOMEM;
fpriv->mmap_state = pci_mmap_io;
fpriv->write_combine = 0;
file->private_data = fpriv;
file->f_mapping = iomem_get_mapping();
return 0;
}
static int proc_bus_pci_release(struct inode *inode, struct file *file)
{
kfree(file->private_data);
file->private_data = NULL;
return 0;
}
#endif /* HAVE_PCI_MMAP */
static const struct proc_ops proc_bus_pci_ops = {
.proc_lseek = proc_bus_pci_lseek,
.proc_read = proc_bus_pci_read,
.proc_write = proc_bus_pci_write,
.proc_ioctl = proc_bus_pci_ioctl,
#ifdef CONFIG_COMPAT
.proc_compat_ioctl = proc_bus_pci_ioctl,
#endif
#ifdef HAVE_PCI_MMAP
.proc_open = proc_bus_pci_open,
.proc_release = proc_bus_pci_release,
.proc_mmap = proc_bus_pci_mmap,
#ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA
.proc_get_unmapped_area = get_pci_unmapped_area,
#endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */
#endif /* HAVE_PCI_MMAP */
};
/* iterator */
static void *pci_seq_start(struct seq_file *m, loff_t *pos)
{
struct pci_dev *dev = NULL;
loff_t n = *pos;
for_each_pci_dev(dev) {
if (!n--)
break;
}
return dev;
}
static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos)
{
struct pci_dev *dev = v;
(*pos)++;
dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
return dev;
}
static void pci_seq_stop(struct seq_file *m, void *v)
{
if (v) {
struct pci_dev *dev = v;
pci_dev_put(dev);
}
}
static int show_device(struct seq_file *m, void *v)
{
const struct pci_dev *dev = v;
const struct pci_driver *drv;
int i;
if (dev == NULL)
return 0;
drv = pci_dev_driver(dev);
seq_printf(m, "%02x%02x\t%04x%04x\t%x",
dev->bus->number,
dev->devfn,
dev->vendor,
dev->device,
dev->irq);
/* only print standard and ROM resources to preserve compatibility */
for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
resource_size_t start, end;
pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
seq_printf(m, "\t%16llx",
(unsigned long long)(start |
(dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
}
for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
resource_size_t start, end;
pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
seq_printf(m, "\t%16llx",
dev->resource[i].start < dev->resource[i].end ?
(unsigned long long)(end - start) + 1 : 0);
}
seq_putc(m, '\t');
if (drv)
seq_puts(m, drv->name);
seq_putc(m, '\n');
return 0;
}
static const struct seq_operations proc_bus_pci_devices_op = {
.start = pci_seq_start,
.next = pci_seq_next,
.stop = pci_seq_stop,
.show = show_device
};
static struct proc_dir_entry *proc_bus_pci_dir;
int pci_proc_attach_device(struct pci_dev *dev)
{
struct pci_bus *bus = dev->bus;
struct proc_dir_entry *e;
char name[16];
if (!proc_initialized)
return -EACCES;
if (!bus->procdir) {
if (pci_proc_domain(bus)) {
sprintf(name, "%04x:%02x", pci_domain_nr(bus),
bus->number);
} else {
sprintf(name, "%02x", bus->number);
}
bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
if (!bus->procdir)
return -ENOMEM;
}
sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
e = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir,
&proc_bus_pci_ops, dev);
if (!e)
return -ENOMEM;
proc_set_size(e, dev->cfg_size);
dev->procent = e;
return 0;
}
int pci_proc_detach_device(struct pci_dev *dev)
{
proc_remove(dev->procent);
dev->procent = NULL;
return 0;
}
int pci_proc_detach_bus(struct pci_bus *bus)
{
proc_remove(bus->procdir);
return 0;
}
static int __init pci_proc_init(void)
{
struct pci_dev *dev = NULL;
proc_bus_pci_dir = proc_mkdir("bus/pci", NULL);
proc_create_seq("devices", 0, proc_bus_pci_dir,
&proc_bus_pci_devices_op);
proc_initialized = 1;
for_each_pci_dev(dev)
pci_proc_attach_device(dev);
return 0;
}
device_initcall(pci_proc_init);