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OpenCloudOS-Kernel/drivers/pci/pci-sysfs.c

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// SPDX-License-Identifier: GPL-2.0
/*
* (C) Copyright 2002-2004 Greg Kroah-Hartman <greg@kroah.com>
* (C) Copyright 2002-2004 IBM Corp.
* (C) Copyright 2003 Matthew Wilcox
* (C) Copyright 2003 Hewlett-Packard
* (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
* (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
*
* File attributes for PCI devices
*
* Modeled after usb's driverfs.c
*/
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/pci.h>
#include <linux/stat.h>
#include <linux/export.h>
#include <linux/topology.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/capability.h>
#include <linux/security.h>
#include <linux/slab.h>
#include <linux/vgaarb.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include "pci.h"
static int sysfs_initialized; /* = 0 */
/* show configuration fields */
#define pci_config_attr(field, format_string) \
static ssize_t \
field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
{ \
struct pci_dev *pdev; \
\
pdev = to_pci_dev(dev); \
return sprintf(buf, format_string, pdev->field); \
} \
static DEVICE_ATTR_RO(field)
pci_config_attr(vendor, "0x%04x\n");
pci_config_attr(device, "0x%04x\n");
pci_config_attr(subsystem_vendor, "0x%04x\n");
pci_config_attr(subsystem_device, "0x%04x\n");
pci_config_attr(revision, "0x%02x\n");
pci_config_attr(class, "0x%06x\n");
pci_config_attr(irq, "%u\n");
static ssize_t broken_parity_status_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct pci_dev *pdev = to_pci_dev(dev);
return sprintf(buf, "%u\n", pdev->broken_parity_status);
}
static ssize_t broken_parity_status_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct pci_dev *pdev = to_pci_dev(dev);
unsigned long val;
if (kstrtoul(buf, 0, &val) < 0)
return -EINVAL;
pdev->broken_parity_status = !!val;
return count;
}
static DEVICE_ATTR_RW(broken_parity_status);
static ssize_t pci_dev_show_local_cpu(struct device *dev, bool list,
struct device_attribute *attr, char *buf)
{
const struct cpumask *mask;
#ifdef CONFIG_NUMA
mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
cpumask_of_node(dev_to_node(dev));
#else
mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
#endif
return cpumap_print_to_pagebuf(list, buf, mask);
}
static ssize_t local_cpus_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return pci_dev_show_local_cpu(dev, false, attr, buf);
}
static DEVICE_ATTR_RO(local_cpus);
static ssize_t local_cpulist_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return pci_dev_show_local_cpu(dev, true, attr, buf);
}
static DEVICE_ATTR_RO(local_cpulist);
/*
* PCI Bus Class Devices
*/
static ssize_t cpuaffinity_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
return cpumap_print_to_pagebuf(false, buf, cpumask);
}
static DEVICE_ATTR_RO(cpuaffinity);
static ssize_t cpulistaffinity_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
return cpumap_print_to_pagebuf(true, buf, cpumask);
}
static DEVICE_ATTR_RO(cpulistaffinity);
/* show resources */
static ssize_t resource_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
char *str = buf;
int i;
int max;
resource_size_t start, end;
if (pci_dev->subordinate)
max = DEVICE_COUNT_RESOURCE;
else
max = PCI_BRIDGE_RESOURCES;
for (i = 0; i < max; i++) {
struct resource *res = &pci_dev->resource[i];
pci_resource_to_user(pci_dev, i, res, &start, &end);
str += sprintf(str, "0x%016llx 0x%016llx 0x%016llx\n",
(unsigned long long)start,
(unsigned long long)end,
(unsigned long long)res->flags);
}
return (str - buf);
}
static DEVICE_ATTR_RO(resource);
static ssize_t max_link_speed_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct pci_dev *pdev = to_pci_dev(dev);
return sprintf(buf, "%s\n", PCIE_SPEED2STR(pcie_get_speed_cap(pdev)));
}
static DEVICE_ATTR_RO(max_link_speed);
static ssize_t max_link_width_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct pci_dev *pdev = to_pci_dev(dev);
return sprintf(buf, "%u\n", pcie_get_width_cap(pdev));
}
static DEVICE_ATTR_RO(max_link_width);
static ssize_t current_link_speed_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
u16 linkstat;
int err;
const char *speed;
err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
if (err)
return -EINVAL;
switch (linkstat & PCI_EXP_LNKSTA_CLS) {
case PCI_EXP_LNKSTA_CLS_32_0GB:
speed = "32 GT/s";
break;
case PCI_EXP_LNKSTA_CLS_16_0GB:
speed = "16 GT/s";
break;
case PCI_EXP_LNKSTA_CLS_8_0GB:
speed = "8 GT/s";
break;
case PCI_EXP_LNKSTA_CLS_5_0GB:
speed = "5 GT/s";
break;
case PCI_EXP_LNKSTA_CLS_2_5GB:
speed = "2.5 GT/s";
break;
default:
speed = "Unknown speed";
}
return sprintf(buf, "%s\n", speed);
}
static DEVICE_ATTR_RO(current_link_speed);
static ssize_t current_link_width_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
u16 linkstat;
int err;
err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
if (err)
return -EINVAL;
return sprintf(buf, "%u\n",
(linkstat & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT);
}
static DEVICE_ATTR_RO(current_link_width);
static ssize_t secondary_bus_number_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
u8 sec_bus;
int err;
err = pci_read_config_byte(pci_dev, PCI_SECONDARY_BUS, &sec_bus);
if (err)
return -EINVAL;
return sprintf(buf, "%u\n", sec_bus);
}
static DEVICE_ATTR_RO(secondary_bus_number);
static ssize_t subordinate_bus_number_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
u8 sub_bus;
int err;
err = pci_read_config_byte(pci_dev, PCI_SUBORDINATE_BUS, &sub_bus);
if (err)
return -EINVAL;
return sprintf(buf, "%u\n", sub_bus);
}
static DEVICE_ATTR_RO(subordinate_bus_number);
static ssize_t ari_enabled_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
return sprintf(buf, "%u\n", pci_ari_enabled(pci_dev->bus));
}
static DEVICE_ATTR_RO(ari_enabled);
static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n",
pci_dev->vendor, pci_dev->device,
pci_dev->subsystem_vendor, pci_dev->subsystem_device,
(u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
(u8)(pci_dev->class));
}
static DEVICE_ATTR_RO(modalias);
static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct pci_dev *pdev = to_pci_dev(dev);
unsigned long val;
ssize_t result = kstrtoul(buf, 0, &val);
if (result < 0)
return result;
/* this can crash the machine when done on the "wrong" device */
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
device_lock(dev);
if (dev->driver)
result = -EBUSY;
else if (val)
result = pci_enable_device(pdev);
else if (pci_is_enabled(pdev))
pci_disable_device(pdev);
else
result = -EIO;
device_unlock(dev);
return result < 0 ? result : count;
}
static ssize_t enable_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct pci_dev *pdev;
pdev = to_pci_dev(dev);
return sprintf(buf, "%u\n", atomic_read(&pdev->enable_cnt));
}
static DEVICE_ATTR_RW(enable);
#ifdef CONFIG_NUMA
static ssize_t numa_node_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
struct pci_dev *pdev = to_pci_dev(dev);
int node, ret;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
ret = kstrtoint(buf, 0, &node);
if (ret)
return ret;
if ((node < 0 && node != NUMA_NO_NODE) || node >= MAX_NUMNODES)
return -EINVAL;
if (node != NUMA_NO_NODE && !node_online(node))
return -EINVAL;
add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
pci_alert(pdev, FW_BUG "Overriding NUMA node to %d. Contact your vendor for updates.",
node);
dev->numa_node = node;
return count;
}
static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
return sprintf(buf, "%d\n", dev->numa_node);
}
static DEVICE_ATTR_RW(numa_node);
#endif
static ssize_t dma_mask_bits_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct pci_dev *pdev = to_pci_dev(dev);
return sprintf(buf, "%d\n", fls64(pdev->dma_mask));
}
static DEVICE_ATTR_RO(dma_mask_bits);
static ssize_t consistent_dma_mask_bits_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
return sprintf(buf, "%d\n", fls64(dev->coherent_dma_mask));
}
static DEVICE_ATTR_RO(consistent_dma_mask_bits);
static ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct pci_dev *pdev = to_pci_dev(dev);
struct pci_bus *subordinate = pdev->subordinate;
return sprintf(buf, "%u\n", subordinate ?
!(subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI)
: !pdev->no_msi);
}
static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct pci_dev *pdev = to_pci_dev(dev);
struct pci_bus *subordinate = pdev->subordinate;
unsigned long val;
if (kstrtoul(buf, 0, &val) < 0)
return -EINVAL;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
/*
* "no_msi" and "bus_flags" only affect what happens when a driver
* requests MSI or MSI-X. They don't affect any drivers that have
* already requested MSI or MSI-X.
*/
if (!subordinate) {
pdev->no_msi = !val;
pci_info(pdev, "MSI/MSI-X %s for future drivers\n",
val ? "allowed" : "disallowed");
return count;
}
if (val)
subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
else
subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
dev_info(&subordinate->dev, "MSI/MSI-X %s for future drivers of devices on this bus\n",
val ? "allowed" : "disallowed");
return count;
}
static DEVICE_ATTR_RW(msi_bus);
static ssize_t rescan_store(struct bus_type *bus, const char *buf, size_t count)
{
unsigned long val;
struct pci_bus *b = NULL;
if (kstrtoul(buf, 0, &val) < 0)
return -EINVAL;
if (val) {
pci_lock_rescan_remove();
while ((b = pci_find_next_bus(b)) != NULL)
pci_rescan_bus(b);
pci_unlock_rescan_remove();
}
return count;
}
static BUS_ATTR_WO(rescan);
static struct attribute *pci_bus_attrs[] = {
&bus_attr_rescan.attr,
NULL,
};
static const struct attribute_group pci_bus_group = {
.attrs = pci_bus_attrs,
};
const struct attribute_group *pci_bus_groups[] = {
&pci_bus_group,
NULL,
};
static ssize_t dev_rescan_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
unsigned long val;
struct pci_dev *pdev = to_pci_dev(dev);
if (kstrtoul(buf, 0, &val) < 0)
return -EINVAL;
if (val) {
pci_lock_rescan_remove();
pci_rescan_bus(pdev->bus);
pci_unlock_rescan_remove();
}
return count;
}
static struct device_attribute dev_attr_dev_rescan = __ATTR(rescan, 0200, NULL,
dev_rescan_store);
static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
unsigned long val;
if (kstrtoul(buf, 0, &val) < 0)
return -EINVAL;
if (val && device_remove_file_self(dev, attr))
pci_stop_and_remove_bus_device_locked(to_pci_dev(dev));
return count;
}
static DEVICE_ATTR_IGNORE_LOCKDEP(remove, 0220, NULL,
remove_store);
static ssize_t bus_rescan_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
unsigned long val;
struct pci_bus *bus = to_pci_bus(dev);
if (kstrtoul(buf, 0, &val) < 0)
return -EINVAL;
if (val) {
pci_lock_rescan_remove();
if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
pci_rescan_bus_bridge_resize(bus->self);
else
pci_rescan_bus(bus);
pci_unlock_rescan_remove();
}
return count;
}
static struct device_attribute dev_attr_bus_rescan = __ATTR(rescan, 0200, NULL,
bus_rescan_store);
#if defined(CONFIG_PM) && defined(CONFIG_ACPI)
static ssize_t d3cold_allowed_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct pci_dev *pdev = to_pci_dev(dev);
unsigned long val;
if (kstrtoul(buf, 0, &val) < 0)
return -EINVAL;
pdev->d3cold_allowed = !!val;
if (pdev->d3cold_allowed)
pci_d3cold_enable(pdev);
else
pci_d3cold_disable(pdev);
pm_runtime_resume(dev);
return count;
}
static ssize_t d3cold_allowed_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct pci_dev *pdev = to_pci_dev(dev);
return sprintf(buf, "%u\n", pdev->d3cold_allowed);
}
static DEVICE_ATTR_RW(d3cold_allowed);
#endif
#ifdef CONFIG_OF
static ssize_t devspec_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct pci_dev *pdev = to_pci_dev(dev);
struct device_node *np = pci_device_to_OF_node(pdev);
if (np == NULL)
return 0;
return sprintf(buf, "%pOF", np);
}
static DEVICE_ATTR_RO(devspec);
#endif
static ssize_t driver_override_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct pci_dev *pdev = to_pci_dev(dev);
char *driver_override, *old, *cp;
/* We need to keep extra room for a newline */
if (count >= (PAGE_SIZE - 1))
return -EINVAL;
driver_override = kstrndup(buf, count, GFP_KERNEL);
if (!driver_override)
return -ENOMEM;
cp = strchr(driver_override, '\n');
if (cp)
*cp = '\0';
device_lock(dev);
old = pdev->driver_override;
if (strlen(driver_override)) {
pdev->driver_override = driver_override;
} else {
kfree(driver_override);
pdev->driver_override = NULL;
}
device_unlock(dev);
kfree(old);
return count;
}
static ssize_t driver_override_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct pci_dev *pdev = to_pci_dev(dev);
ssize_t len;
device_lock(dev);
len = snprintf(buf, PAGE_SIZE, "%s\n", pdev->driver_override);
device_unlock(dev);
return len;
}
static DEVICE_ATTR_RW(driver_override);
static struct attribute *pci_dev_attrs[] = {
&dev_attr_resource.attr,
&dev_attr_vendor.attr,
&dev_attr_device.attr,
&dev_attr_subsystem_vendor.attr,
&dev_attr_subsystem_device.attr,
&dev_attr_revision.attr,
&dev_attr_class.attr,
&dev_attr_irq.attr,
&dev_attr_local_cpus.attr,
&dev_attr_local_cpulist.attr,
&dev_attr_modalias.attr,
#ifdef CONFIG_NUMA
&dev_attr_numa_node.attr,
#endif
&dev_attr_dma_mask_bits.attr,
&dev_attr_consistent_dma_mask_bits.attr,
&dev_attr_enable.attr,
&dev_attr_broken_parity_status.attr,
&dev_attr_msi_bus.attr,
#if defined(CONFIG_PM) && defined(CONFIG_ACPI)
&dev_attr_d3cold_allowed.attr,
#endif
#ifdef CONFIG_OF
&dev_attr_devspec.attr,
#endif
&dev_attr_driver_override.attr,
&dev_attr_ari_enabled.attr,
NULL,
};
static struct attribute *pci_bridge_attrs[] = {
&dev_attr_subordinate_bus_number.attr,
&dev_attr_secondary_bus_number.attr,
NULL,
};
static struct attribute *pcie_dev_attrs[] = {
&dev_attr_current_link_speed.attr,
&dev_attr_current_link_width.attr,
&dev_attr_max_link_width.attr,
&dev_attr_max_link_speed.attr,
NULL,
};
static struct attribute *pcibus_attrs[] = {
&dev_attr_bus_rescan.attr,
&dev_attr_cpuaffinity.attr,
&dev_attr_cpulistaffinity.attr,
NULL,
};
static const struct attribute_group pcibus_group = {
.attrs = pcibus_attrs,
};
const struct attribute_group *pcibus_groups[] = {
&pcibus_group,
NULL,
};
static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct pci_dev *pdev = to_pci_dev(dev);
struct pci_dev *vga_dev = vga_default_device();
if (vga_dev)
return sprintf(buf, "%u\n", (pdev == vga_dev));
return sprintf(buf, "%u\n",
!!(pdev->resource[PCI_ROM_RESOURCE].flags &
IORESOURCE_ROM_SHADOW));
}
static DEVICE_ATTR_RO(boot_vga);
static ssize_t pci_read_config(struct file *filp, struct kobject *kobj,
struct bin_attribute *bin_attr, char *buf,
loff_t off, size_t count)
{
struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
unsigned int size = 64;
loff_t init_off = off;
u8 *data = (u8 *) buf;
/* Several chips lock up trying to read undefined config space */
if (file_ns_capable(filp, &init_user_ns, CAP_SYS_ADMIN))
size = dev->cfg_size;
else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
size = 128;
if (off > size)
return 0;
if (off + count > size) {
size -= off;
count = size;
} else {
size = count;
}
pci_config_pm_runtime_get(dev);
if ((off & 1) && size) {
u8 val;
pci_user_read_config_byte(dev, off, &val);
data[off - init_off] = val;
off++;
size--;
}
if ((off & 3) && size > 2) {
u16 val;
pci_user_read_config_word(dev, off, &val);
data[off - init_off] = val & 0xff;
data[off - init_off + 1] = (val >> 8) & 0xff;
off += 2;
size -= 2;
}
while (size > 3) {
u32 val;
pci_user_read_config_dword(dev, off, &val);
data[off - init_off] = val & 0xff;
data[off - init_off + 1] = (val >> 8) & 0xff;
data[off - init_off + 2] = (val >> 16) & 0xff;
data[off - init_off + 3] = (val >> 24) & 0xff;
off += 4;
size -= 4;
}
if (size >= 2) {
u16 val;
pci_user_read_config_word(dev, off, &val);
data[off - init_off] = val & 0xff;
data[off - init_off + 1] = (val >> 8) & 0xff;
off += 2;
size -= 2;
}
if (size > 0) {
u8 val;
pci_user_read_config_byte(dev, off, &val);
data[off - init_off] = val;
off++;
--size;
}
pci_config_pm_runtime_put(dev);
return count;
}
static ssize_t pci_write_config(struct file *filp, struct kobject *kobj,
struct bin_attribute *bin_attr, char *buf,
loff_t off, size_t count)
{
struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
unsigned int size = count;
loff_t init_off = off;
u8 *data = (u8 *) buf;
int ret;
ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
if (ret)
return ret;
if (off > dev->cfg_size)
return 0;
if (off + count > dev->cfg_size) {
size = dev->cfg_size - off;
count = size;
}
pci_config_pm_runtime_get(dev);
if ((off & 1) && size) {
pci_user_write_config_byte(dev, off, data[off - init_off]);
off++;
size--;
}
if ((off & 3) && size > 2) {
u16 val = data[off - init_off];
val |= (u16) data[off - init_off + 1] << 8;
pci_user_write_config_word(dev, off, val);
off += 2;
size -= 2;
}
while (size > 3) {
u32 val = data[off - init_off];
val |= (u32) data[off - init_off + 1] << 8;
val |= (u32) data[off - init_off + 2] << 16;
val |= (u32) data[off - init_off + 3] << 24;
pci_user_write_config_dword(dev, off, val);
off += 4;
size -= 4;
}
if (size >= 2) {
u16 val = data[off - init_off];
val |= (u16) data[off - init_off + 1] << 8;
pci_user_write_config_word(dev, off, val);
off += 2;
size -= 2;
}
if (size) {
pci_user_write_config_byte(dev, off, data[off - init_off]);
off++;
--size;
}
pci_config_pm_runtime_put(dev);
return count;
}
#ifdef HAVE_PCI_LEGACY
/**
* pci_read_legacy_io - read byte(s) from legacy I/O port space
* @filp: open sysfs file
* @kobj: kobject corresponding to file to read from
* @bin_attr: struct bin_attribute for this file
* @buf: buffer to store results
* @off: offset into legacy I/O port space
* @count: number of bytes to read
*
* Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
* callback routine (pci_legacy_read).
*/
static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj,
struct bin_attribute *bin_attr, char *buf,
loff_t off, size_t count)
{
struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
/* Only support 1, 2 or 4 byte accesses */
if (count != 1 && count != 2 && count != 4)
return -EINVAL;
return pci_legacy_read(bus, off, (u32 *)buf, count);
}
/**
* pci_write_legacy_io - write byte(s) to legacy I/O port space
* @filp: open sysfs file
* @kobj: kobject corresponding to file to read from
* @bin_attr: struct bin_attribute for this file
* @buf: buffer containing value to be written
* @off: offset into legacy I/O port space
* @count: number of bytes to write
*
* Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
* callback routine (pci_legacy_write).
*/
static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj,
struct bin_attribute *bin_attr, char *buf,
loff_t off, size_t count)
{
struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
/* Only support 1, 2 or 4 byte accesses */
if (count != 1 && count != 2 && count != 4)
return -EINVAL;
return pci_legacy_write(bus, off, *(u32 *)buf, count);
}
/**
* pci_mmap_legacy_mem - map legacy PCI memory into user memory space
* @filp: open sysfs file
* @kobj: kobject corresponding to device to be mapped
* @attr: struct bin_attribute for this file
* @vma: struct vm_area_struct passed to mmap
*
* Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
* legacy memory space (first meg of bus space) into application virtual
* memory space.
*/
static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr,
struct vm_area_struct *vma)
{
struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
}
/**
* pci_mmap_legacy_io - map legacy PCI IO into user memory space
* @filp: open sysfs file
* @kobj: kobject corresponding to device to be mapped
* @attr: struct bin_attribute for this file
* @vma: struct vm_area_struct passed to mmap
*
* Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
* legacy IO space (first meg of bus space) into application virtual
* memory space. Returns -ENOSYS if the operation isn't supported
*/
static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr,
struct vm_area_struct *vma)
{
struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
}
/**
* pci_adjust_legacy_attr - adjustment of legacy file attributes
* @b: bus to create files under
* @mmap_type: I/O port or memory
*
* Stub implementation. Can be overridden by arch if necessary.
*/
void __weak pci_adjust_legacy_attr(struct pci_bus *b,
enum pci_mmap_state mmap_type)
{
}
/**
* pci_create_legacy_files - create legacy I/O port and memory files
* @b: bus to create files under
*
* Some platforms allow access to legacy I/O port and ISA memory space on
* a per-bus basis. This routine creates the files and ties them into
* their associated read, write and mmap files from pci-sysfs.c
*
* On error unwind, but don't propagate the error to the caller
* as it is ok to set up the PCI bus without these files.
*/
void pci_create_legacy_files(struct pci_bus *b)
{
int error;
b->legacy_io = kcalloc(2, sizeof(struct bin_attribute),
GFP_ATOMIC);
if (!b->legacy_io)
goto kzalloc_err;
sysfs_bin_attr_init(b->legacy_io);
b->legacy_io->attr.name = "legacy_io";
b->legacy_io->size = 0xffff;
b->legacy_io->attr.mode = 0600;
b->legacy_io->read = pci_read_legacy_io;
b->legacy_io->write = pci_write_legacy_io;
b->legacy_io->mmap = pci_mmap_legacy_io;
pci_adjust_legacy_attr(b, pci_mmap_io);
error = device_create_bin_file(&b->dev, b->legacy_io);
if (error)
goto legacy_io_err;
/* Allocated above after the legacy_io struct */
b->legacy_mem = b->legacy_io + 1;
sysfs_bin_attr_init(b->legacy_mem);
b->legacy_mem->attr.name = "legacy_mem";
b->legacy_mem->size = 1024*1024;
b->legacy_mem->attr.mode = 0600;
b->legacy_mem->mmap = pci_mmap_legacy_mem;
pci_adjust_legacy_attr(b, pci_mmap_mem);
error = device_create_bin_file(&b->dev, b->legacy_mem);
if (error)
goto legacy_mem_err;
return;
legacy_mem_err:
device_remove_bin_file(&b->dev, b->legacy_io);
legacy_io_err:
kfree(b->legacy_io);
b->legacy_io = NULL;
kzalloc_err:
dev_warn(&b->dev, "could not create legacy I/O port and ISA memory resources in sysfs\n");
}
void pci_remove_legacy_files(struct pci_bus *b)
{
if (b->legacy_io) {
device_remove_bin_file(&b->dev, b->legacy_io);
device_remove_bin_file(&b->dev, b->legacy_mem);
kfree(b->legacy_io); /* both are allocated here */
}
}
#endif /* HAVE_PCI_LEGACY */
#if defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)
int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
enum pci_mmap_api mmap_api)
{
unsigned long nr, start, size;
resource_size_t pci_start = 0, pci_end;
if (pci_resource_len(pdev, resno) == 0)
return 0;
nr = vma_pages(vma);
start = vma->vm_pgoff;
size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
if (mmap_api == PCI_MMAP_PROCFS) {
pci_resource_to_user(pdev, resno, &pdev->resource[resno],
&pci_start, &pci_end);
pci_start >>= PAGE_SHIFT;
}
if (start >= pci_start && start < pci_start + size &&
start + nr <= pci_start + size)
return 1;
return 0;
}
/**
* pci_mmap_resource - map a PCI resource into user memory space
* @kobj: kobject for mapping
* @attr: struct bin_attribute for the file being mapped
* @vma: struct vm_area_struct passed into the mmap
* @write_combine: 1 for write_combine mapping
*
* Use the regular PCI mapping routines to map a PCI resource into userspace.
*/
static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
struct vm_area_struct *vma, int write_combine)
{
struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
int bar = (unsigned long)attr->private;
enum pci_mmap_state mmap_type;
struct resource *res = &pdev->resource[bar];
int ret;
ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
if (ret)
return ret;
if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start))
return -EINVAL;
if (!pci_mmap_fits(pdev, bar, vma, PCI_MMAP_SYSFS))
return -EINVAL;
mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
return pci_mmap_resource_range(pdev, bar, vma, mmap_type, write_combine);
}
static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr,
struct vm_area_struct *vma)
{
return pci_mmap_resource(kobj, attr, vma, 0);
}
static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr,
struct vm_area_struct *vma)
{
return pci_mmap_resource(kobj, attr, vma, 1);
}
static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr, char *buf,
loff_t off, size_t count, bool write)
{
struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
int bar = (unsigned long)attr->private;
unsigned long port = off;
port += pci_resource_start(pdev, bar);
if (port > pci_resource_end(pdev, bar))
return 0;
if (port + count - 1 > pci_resource_end(pdev, bar))
return -EINVAL;
switch (count) {
case 1:
if (write)
outb(*(u8 *)buf, port);
else
*(u8 *)buf = inb(port);
return 1;
case 2:
if (write)
outw(*(u16 *)buf, port);
else
*(u16 *)buf = inw(port);
return 2;
case 4:
if (write)
outl(*(u32 *)buf, port);
else
*(u32 *)buf = inl(port);
return 4;
}
return -EINVAL;
}
static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr, char *buf,
loff_t off, size_t count)
{
return pci_resource_io(filp, kobj, attr, buf, off, count, false);
}
static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr, char *buf,
loff_t off, size_t count)
{
int ret;
ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
if (ret)
return ret;
return pci_resource_io(filp, kobj, attr, buf, off, count, true);
}
/**
* pci_remove_resource_files - cleanup resource files
* @pdev: dev to cleanup
*
* If we created resource files for @pdev, remove them from sysfs and
* free their resources.
*/
static void pci_remove_resource_files(struct pci_dev *pdev)
{
int i;
for (i = 0; i < PCI_ROM_RESOURCE; i++) {
struct bin_attribute *res_attr;
res_attr = pdev->res_attr[i];
if (res_attr) {
sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
kfree(res_attr);
}
res_attr = pdev->res_attr_wc[i];
if (res_attr) {
sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
kfree(res_attr);
}
}
}
static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
{
/* allocate attribute structure, piggyback attribute name */
int name_len = write_combine ? 13 : 10;
struct bin_attribute *res_attr;
char *res_attr_name;
int retval;
res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
if (!res_attr)
return -ENOMEM;
res_attr_name = (char *)(res_attr + 1);
sysfs_bin_attr_init(res_attr);
if (write_combine) {
sprintf(res_attr_name, "resource%d_wc", num);
res_attr->mmap = pci_mmap_resource_wc;
} else {
sprintf(res_attr_name, "resource%d", num);
if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
res_attr->read = pci_read_resource_io;
res_attr->write = pci_write_resource_io;
if (arch_can_pci_mmap_io())
res_attr->mmap = pci_mmap_resource_uc;
} else {
res_attr->mmap = pci_mmap_resource_uc;
}
}
res_attr->attr.name = res_attr_name;
res_attr->attr.mode = 0600;
res_attr->size = pci_resource_len(pdev, num);
res_attr->private = (void *)(unsigned long)num;
retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
if (retval) {
kfree(res_attr);
return retval;
}
if (write_combine)
pdev->res_attr_wc[num] = res_attr;
else
pdev->res_attr[num] = res_attr;
return 0;
}
/**
* pci_create_resource_files - create resource files in sysfs for @dev
* @pdev: dev in question
*
* Walk the resources in @pdev creating files for each resource available.
*/
static int pci_create_resource_files(struct pci_dev *pdev)
{
int i;
int retval;
/* Expose the PCI resources from this device as files */
for (i = 0; i < PCI_ROM_RESOURCE; i++) {
/* skip empty resources */
if (!pci_resource_len(pdev, i))
continue;
retval = pci_create_attr(pdev, i, 0);
/* for prefetchable resources, create a WC mappable file */
if (!retval && arch_can_pci_mmap_wc() &&
pdev->resource[i].flags & IORESOURCE_PREFETCH)
retval = pci_create_attr(pdev, i, 1);
if (retval) {
pci_remove_resource_files(pdev);
return retval;
}
}
return 0;
}
#else /* !HAVE_PCI_MMAP */
int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
#endif /* HAVE_PCI_MMAP */
/**
* pci_write_rom - used to enable access to the PCI ROM display
* @filp: sysfs file
* @kobj: kernel object handle
* @bin_attr: struct bin_attribute for this file
* @buf: user input
* @off: file offset
* @count: number of byte in input
*
* writing anything except 0 enables it
*/
static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj,
struct bin_attribute *bin_attr, char *buf,
loff_t off, size_t count)
{
struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
if ((off == 0) && (*buf == '0') && (count == 2))
pdev->rom_attr_enabled = 0;
else
pdev->rom_attr_enabled = 1;
return count;
}
/**
* pci_read_rom - read a PCI ROM
* @filp: sysfs file
* @kobj: kernel object handle
* @bin_attr: struct bin_attribute for this file
* @buf: where to put the data we read from the ROM
* @off: file offset
* @count: number of bytes to read
*
* Put @count bytes starting at @off into @buf from the ROM in the PCI
* device corresponding to @kobj.
*/
static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj,
struct bin_attribute *bin_attr, char *buf,
loff_t off, size_t count)
{
struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
void __iomem *rom;
size_t size;
if (!pdev->rom_attr_enabled)
return -EINVAL;
rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
if (!rom || !size)
return -EIO;
if (off >= size)
count = 0;
else {
if (off + count > size)
count = size - off;
memcpy_fromio(buf, rom + off, count);
}
pci_unmap_rom(pdev, rom);
return count;
}
static const struct bin_attribute pci_config_attr = {
.attr = {
.name = "config",
.mode = 0644,
},
.size = PCI_CFG_SPACE_SIZE,
.read = pci_read_config,
.write = pci_write_config,
};
static const struct bin_attribute pcie_config_attr = {
.attr = {
.name = "config",
.mode = 0644,
},
.size = PCI_CFG_SPACE_EXP_SIZE,
.read = pci_read_config,
.write = pci_write_config,
};
static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct pci_dev *pdev = to_pci_dev(dev);
unsigned long val;
ssize_t result = kstrtoul(buf, 0, &val);
if (result < 0)
return result;
if (val != 1)
return -EINVAL;
pm_runtime_get_sync(dev);
result = pci_reset_function(pdev);
pm_runtime_put(dev);
if (result < 0)
return result;
return count;
}
static DEVICE_ATTR(reset, 0200, NULL, reset_store);
static int pci_create_capabilities_sysfs(struct pci_dev *dev)
{
int retval;
pcie_vpd_create_sysfs_dev_files(dev);
pcie_aspm_create_sysfs_dev_files(dev);
if (dev->reset_fn) {
retval = device_create_file(&dev->dev, &dev_attr_reset);
if (retval)
goto error;
}
return 0;
error:
pcie_aspm_remove_sysfs_dev_files(dev);
pcie_vpd_remove_sysfs_dev_files(dev);
return retval;
}
int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
{
int retval;
int rom_size;
struct bin_attribute *attr;
if (!sysfs_initialized)
return -EACCES;
if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
else
retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
if (retval)
goto err;
retval = pci_create_resource_files(pdev);
if (retval)
goto err_config_file;
/* If the device has a ROM, try to expose it in sysfs. */
rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
if (rom_size) {
attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
if (!attr) {
retval = -ENOMEM;
goto err_resource_files;
}
sysfs_bin_attr_init(attr);
attr->size = rom_size;
attr->attr.name = "rom";
attr->attr.mode = 0600;
attr->read = pci_read_rom;
attr->write = pci_write_rom;
retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
if (retval) {
kfree(attr);
goto err_resource_files;
}
pdev->rom_attr = attr;
}
/* add sysfs entries for various capabilities */
retval = pci_create_capabilities_sysfs(pdev);
if (retval)
goto err_rom_file;
pci_create_firmware_label_files(pdev);
return 0;
err_rom_file:
if (pdev->rom_attr) {
sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
kfree(pdev->rom_attr);
pdev->rom_attr = NULL;
}
err_resource_files:
pci_remove_resource_files(pdev);
err_config_file:
if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
else
sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
err:
return retval;
}
static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
{
pcie_vpd_remove_sysfs_dev_files(dev);
pcie_aspm_remove_sysfs_dev_files(dev);
if (dev->reset_fn) {
device_remove_file(&dev->dev, &dev_attr_reset);
dev->reset_fn = 0;
}
}
/**
* pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
* @pdev: device whose entries we should free
*
* Cleanup when @pdev is removed from sysfs.
*/
void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
{
if (!sysfs_initialized)
return;
pci_remove_capabilities_sysfs(pdev);
if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
else
sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
pci_remove_resource_files(pdev);
if (pdev->rom_attr) {
sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
kfree(pdev->rom_attr);
pdev->rom_attr = NULL;
}
pci_remove_firmware_label_files(pdev);
}
static int __init pci_sysfs_init(void)
{
struct pci_dev *pdev = NULL;
int retval;
sysfs_initialized = 1;
for_each_pci_dev(pdev) {
retval = pci_create_sysfs_dev_files(pdev);
if (retval) {
pci_dev_put(pdev);
return retval;
}
}
return 0;
}
late_initcall(pci_sysfs_init);
static struct attribute *pci_dev_dev_attrs[] = {
&dev_attr_boot_vga.attr,
NULL,
};
static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
struct attribute *a, int n)
{
struct device *dev = kobj_to_dev(kobj);
struct pci_dev *pdev = to_pci_dev(dev);
if (a == &dev_attr_boot_vga.attr)
if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
return 0;
return a->mode;
}
static struct attribute *pci_dev_hp_attrs[] = {
&dev_attr_remove.attr,
&dev_attr_dev_rescan.attr,
NULL,
};
static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
struct attribute *a, int n)
{
struct device *dev = kobj_to_dev(kobj);
struct pci_dev *pdev = to_pci_dev(dev);
if (pdev->is_virtfn)
return 0;
return a->mode;
}
static umode_t pci_bridge_attrs_are_visible(struct kobject *kobj,
struct attribute *a, int n)
{
struct device *dev = kobj_to_dev(kobj);
struct pci_dev *pdev = to_pci_dev(dev);
if (pci_is_bridge(pdev))
return a->mode;
return 0;
}
static umode_t pcie_dev_attrs_are_visible(struct kobject *kobj,
struct attribute *a, int n)
{
struct device *dev = kobj_to_dev(kobj);
struct pci_dev *pdev = to_pci_dev(dev);
if (pci_is_pcie(pdev))
return a->mode;
return 0;
}
static const struct attribute_group pci_dev_group = {
.attrs = pci_dev_attrs,
};
const struct attribute_group *pci_dev_groups[] = {
&pci_dev_group,
NULL,
};
static const struct attribute_group pci_bridge_group = {
.attrs = pci_bridge_attrs,
};
const struct attribute_group *pci_bridge_groups[] = {
&pci_bridge_group,
NULL,
};
static const struct attribute_group pcie_dev_group = {
.attrs = pcie_dev_attrs,
};
const struct attribute_group *pcie_dev_groups[] = {
&pcie_dev_group,
NULL,
};
static const struct attribute_group pci_dev_hp_attr_group = {
.attrs = pci_dev_hp_attrs,
.is_visible = pci_dev_hp_attrs_are_visible,
};
static const struct attribute_group pci_dev_attr_group = {
.attrs = pci_dev_dev_attrs,
.is_visible = pci_dev_attrs_are_visible,
};
static const struct attribute_group pci_bridge_attr_group = {
.attrs = pci_bridge_attrs,
.is_visible = pci_bridge_attrs_are_visible,
};
static const struct attribute_group pcie_dev_attr_group = {
.attrs = pcie_dev_attrs,
.is_visible = pcie_dev_attrs_are_visible,
};
static const struct attribute_group *pci_dev_attr_groups[] = {
&pci_dev_attr_group,
&pci_dev_hp_attr_group,
#ifdef CONFIG_PCI_IOV
&sriov_dev_attr_group,
#endif
&pci_bridge_attr_group,
&pcie_dev_attr_group,
#ifdef CONFIG_PCIEAER
&aer_stats_attr_group,
#endif
NULL,
};
const struct device_type pci_dev_type = {
.groups = pci_dev_attr_groups,
};
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