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pci-sysfs.c
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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_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_rescan_attr = __ATTR(rescan,
(S_IWUSR|S_IWGRP),
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 struct device_attribute dev_remove_attr = __ATTR(remove,
(S_IWUSR|S_IWGRP),
NULL, remove_store);
static ssize_t dev_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 DEVICE_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_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
#ifdef CONFIG_PCI_IOV
static ssize_t sriov_totalvfs_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct pci_dev *pdev = to_pci_dev(dev);
return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
}
static ssize_t sriov_numvfs_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct pci_dev *pdev = to_pci_dev(dev);
return sprintf(buf, "%u\n", pdev->sriov->num_VFs);
}
/*
* num_vfs > 0; number of VFs to enable
* num_vfs = 0; disable all VFs
*
* Note: SRIOV spec doesn't allow partial VF
* disable, so it's all or none.
*/
static ssize_t sriov_numvfs_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct pci_dev *pdev = to_pci_dev(dev);
int ret;
u16 num_vfs;
ret = kstrtou16(buf, 0, &num_vfs);
if (ret < 0)
return ret;
if (num_vfs > pci_sriov_get_totalvfs(pdev))
return -ERANGE;
device_lock(&pdev->dev);
if (num_vfs == pdev->sriov->num_VFs)
goto exit;
/* is PF driver loaded w/callback */
if (!pdev->driver || !pdev->driver->sriov_configure) {
pci_info(pdev, "Driver doesn't support SRIOV configuration via sysfs\n");
ret = -ENOENT;
goto exit;
}
if (num_vfs == 0) {
/* disable VFs */
ret = pdev->driver->sriov_configure(pdev, 0);
goto exit;
}
/* enable VFs */
if (pdev->sriov->num_VFs) {
pci_warn(pdev, "%d VFs already enabled. Disable before enabling %d VFs\n",
pdev->sriov->num_VFs, num_vfs);
ret = -EBUSY;
goto exit;
}
ret = pdev->driver->sriov_configure(pdev, num_vfs);
if (ret < 0)
goto exit;
if (ret != num_vfs)
pci_warn(pdev, "%d VFs requested; only %d enabled\n",
num_vfs, ret);
exit:
device_unlock(&pdev->dev);
if (ret < 0)
return ret;
return count;
}
static ssize_t sriov_offset_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct pci_dev *pdev = to_pci_dev(dev);
return sprintf(buf, "%u\n", pdev->sriov->offset);
}
static ssize_t sriov_stride_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct pci_dev *pdev = to_pci_dev(dev);
return sprintf(buf, "%u\n", pdev->sriov->stride);
}
static ssize_t sriov_vf_device_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct pci_dev *pdev = to_pci_dev(dev);
return sprintf(buf, "%x\n", pdev->sriov->vf_device);
}
static ssize_t sriov_drivers_autoprobe_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct pci_dev *pdev = to_pci_dev(dev);
return sprintf(buf, "%u\n", pdev->sriov->drivers_autoprobe);
}
static ssize_t sriov_drivers_autoprobe_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct pci_dev *pdev = to_pci_dev(dev);
bool drivers_autoprobe;
if (kstrtobool(buf, &drivers_autoprobe) < 0)
return -EINVAL;
pdev->sriov->drivers_autoprobe = drivers_autoprobe;
return count;
}
static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
static struct device_attribute sriov_numvfs_attr =
__ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP),
sriov_numvfs_show, sriov_numvfs_store);
static struct device_attribute sriov_offset_attr = __ATTR_RO(sriov_offset);
static struct device_attribute sriov_stride_attr = __ATTR_RO(sriov_stride);
static struct device_attribute sriov_vf_device_attr = __ATTR_RO(sriov_vf_device);
static struct device_attribute sriov_drivers_autoprobe_attr =
__ATTR(sriov_drivers_autoprobe, (S_IRUGO|S_IWUSR|S_IWGRP),
sriov_drivers_autoprobe_show, sriov_drivers_autoprobe_store);
#endif /* CONFIG_PCI_IOV */
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_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 struct device_attribute vga_attr = __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;
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)
{