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-rw-r--r--drivers/pci/pci-sysfs.c1656
1 files changed, 1656 insertions, 0 deletions
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
new file mode 100644
index 000000000..df1c44a5c
--- /dev/null
+++ b/drivers/pci/pci-sysfs.c
@@ -0,0 +1,1656 @@
+// 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/bitfield.h>
+#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/msi.h>
+#include <linux/of.h>
+#include <linux/aperture.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 sysfs_emit(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");
+
+static ssize_t irq_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+
+#ifdef CONFIG_PCI_MSI
+ /*
+ * For MSI, show the first MSI IRQ; for all other cases including
+ * MSI-X, show the legacy INTx IRQ.
+ */
+ if (pdev->msi_enabled)
+ return sysfs_emit(buf, "%u\n", pci_irq_vector(pdev, 0));
+#endif
+
+ return sysfs_emit(buf, "%u\n", pdev->irq);
+}
+static DEVICE_ATTR_RO(irq);
+
+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 sysfs_emit(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
+ if (dev_to_node(dev) == NUMA_NO_NODE)
+ mask = cpu_online_mask;
+ else
+ 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);
+
+static ssize_t power_state_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+
+ return sysfs_emit(buf, "%s\n", pci_power_name(pdev->current_state));
+}
+static DEVICE_ATTR_RO(power_state);
+
+/* 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);
+ int i;
+ int max;
+ resource_size_t start, end;
+ size_t len = 0;
+
+ 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);
+ len += sysfs_emit_at(buf, len, "0x%016llx 0x%016llx 0x%016llx\n",
+ (unsigned long long)start,
+ (unsigned long long)end,
+ (unsigned long long)res->flags);
+ }
+ return len;
+}
+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 sysfs_emit(buf, "%s\n",
+ pci_speed_string(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 sysfs_emit(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;
+ enum pci_bus_speed speed;
+
+ err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
+ if (err)
+ return -EINVAL;
+
+ speed = pcie_link_speed[linkstat & PCI_EXP_LNKSTA_CLS];
+
+ return sysfs_emit(buf, "%s\n", pci_speed_string(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 sysfs_emit(buf, "%u\n", FIELD_GET(PCI_EXP_LNKSTA_NLW, linkstat));
+}
+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 sysfs_emit(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 sysfs_emit(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 sysfs_emit(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 sysfs_emit(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 = 0;
+
+ /* this can crash the machine when done on the "wrong" device */
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (kstrtoul(buf, 0, &val) < 0)
+ return -EINVAL;
+
+ 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 sysfs_emit(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;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (kstrtoint(buf, 0, &node) < 0)
+ return -EINVAL;
+
+ 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 sysfs_emit(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 sysfs_emit(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 sysfs_emit(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 sysfs_emit(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 (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (kstrtoul(buf, 0, &val) < 0)
+ return -EINVAL;
+
+ /*
+ * "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;
+ pci_bridge_d3_update(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 sysfs_emit(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 sysfs_emit(buf, "%pOF\n", 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);
+ int ret;
+
+ ret = driver_set_override(dev, &pdev->driver_override, buf, count);
+ if (ret)
+ return ret;
+
+ 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 = sysfs_emit(buf, "%s\n", pdev->driver_override);
+ device_unlock(dev);
+ return len;
+}
+static DEVICE_ATTR_RW(driver_override);
+
+static struct attribute *pci_dev_attrs[] = {
+ &dev_attr_power_state.attr,
+ &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 sysfs_emit(buf, "%u\n", (pdev == vga_dev));
+
+ return sysfs_emit(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;
+ cond_resched();
+ }
+
+ 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;
+ }
+
+ 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 (resource_is_exclusive(&dev->driver_exclusive_resource, off,
+ count)) {
+ pci_warn_once(dev, "%s: Unexpected write to kernel-exclusive config offset %llx",
+ current->comm, off);
+ add_taint(TAINT_USER, LOCKDEP_STILL_OK);
+ }
+
+ 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]);
+
+ pci_config_pm_runtime_put(dev);
+
+ return count;
+}
+static BIN_ATTR(config, 0644, pci_read_config, pci_write_config, 0);
+
+static struct bin_attribute *pci_dev_config_attrs[] = {
+ &bin_attr_config,
+ NULL,
+};
+
+static umode_t pci_dev_config_attr_is_visible(struct kobject *kobj,
+ struct bin_attribute *a, int n)
+{
+ struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
+
+ a->size = PCI_CFG_SPACE_SIZE;
+ if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
+ a->size = PCI_CFG_SPACE_EXP_SIZE;
+
+ return a->attr.mode;
+}
+
+static const struct attribute_group pci_dev_config_attr_group = {
+ .bin_attrs = pci_dev_config_attrs,
+ .is_bin_visible = pci_dev_config_attr_is_visible,
+};
+
+#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;
+
+ if (!sysfs_initialized)
+ return;
+
+ 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;
+ b->legacy_io->f_mapping = iomem_get_mapping;
+ 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;
+ b->legacy_mem->f_mapping = iomem_get_mapping;
+ 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_STD_NUM_BARS; 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;
+ }
+ }
+ if (res_attr->mmap)
+ res_attr->f_mapping = iomem_get_mapping;
+ 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_STD_NUM_BARS; 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 /* !(defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)) */
+int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
+void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
+#endif
+
+/**
+ * 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 BIN_ATTR(rom, 0600, pci_read_rom, pci_write_rom, 0);
+
+static struct bin_attribute *pci_dev_rom_attrs[] = {
+ &bin_attr_rom,
+ NULL,
+};
+
+static umode_t pci_dev_rom_attr_is_visible(struct kobject *kobj,
+ struct bin_attribute *a, int n)
+{
+ struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
+ size_t rom_size;
+
+ /* If the device has a ROM, try to expose it in sysfs. */
+ rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
+ if (!rom_size)
+ return 0;
+
+ a->size = rom_size;
+
+ return a->attr.mode;
+}
+
+static const struct attribute_group pci_dev_rom_attr_group = {
+ .bin_attrs = pci_dev_rom_attrs,
+ .is_bin_visible = pci_dev_rom_attr_is_visible,
+};
+
+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;
+
+ if (kstrtoul(buf, 0, &val) < 0)
+ return -EINVAL;
+
+ 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_WO(reset);
+
+static struct attribute *pci_dev_reset_attrs[] = {
+ &dev_attr_reset.attr,
+ NULL,
+};
+
+static umode_t pci_dev_reset_attr_is_visible(struct kobject *kobj,
+ struct attribute *a, int n)
+{
+ struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
+
+ if (!pci_reset_supported(pdev))
+ return 0;
+
+ return a->mode;
+}
+
+static const struct attribute_group pci_dev_reset_attr_group = {
+ .attrs = pci_dev_reset_attrs,
+ .is_visible = pci_dev_reset_attr_is_visible,
+};
+
+#define pci_dev_resource_resize_attr(n) \
+static ssize_t resource##n##_resize_show(struct device *dev, \
+ struct device_attribute *attr, \
+ char * buf) \
+{ \
+ struct pci_dev *pdev = to_pci_dev(dev); \
+ ssize_t ret; \
+ \
+ pci_config_pm_runtime_get(pdev); \
+ \
+ ret = sysfs_emit(buf, "%016llx\n", \
+ (u64)pci_rebar_get_possible_sizes(pdev, n)); \
+ \
+ pci_config_pm_runtime_put(pdev); \
+ \
+ return ret; \
+} \
+ \
+static ssize_t resource##n##_resize_store(struct device *dev, \
+ struct device_attribute *attr,\
+ const char *buf, size_t count)\
+{ \
+ struct pci_dev *pdev = to_pci_dev(dev); \
+ unsigned long size, flags; \
+ int ret, i; \
+ u16 cmd; \
+ \
+ if (kstrtoul(buf, 0, &size) < 0) \
+ return -EINVAL; \
+ \
+ device_lock(dev); \
+ if (dev->driver) { \
+ ret = -EBUSY; \
+ goto unlock; \
+ } \
+ \
+ pci_config_pm_runtime_get(pdev); \
+ \
+ if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA) { \
+ ret = aperture_remove_conflicting_pci_devices(pdev, \
+ "resourceN_resize"); \
+ if (ret) \
+ goto pm_put; \
+ } \
+ \
+ pci_read_config_word(pdev, PCI_COMMAND, &cmd); \
+ pci_write_config_word(pdev, PCI_COMMAND, \
+ cmd & ~PCI_COMMAND_MEMORY); \
+ \
+ flags = pci_resource_flags(pdev, n); \
+ \
+ pci_remove_resource_files(pdev); \
+ \
+ for (i = 0; i < PCI_STD_NUM_BARS; i++) { \
+ if (pci_resource_len(pdev, i) && \
+ pci_resource_flags(pdev, i) == flags) \
+ pci_release_resource(pdev, i); \
+ } \
+ \
+ ret = pci_resize_resource(pdev, n, size); \
+ \
+ pci_assign_unassigned_bus_resources(pdev->bus); \
+ \
+ if (pci_create_resource_files(pdev)) \
+ pci_warn(pdev, "Failed to recreate resource files after BAR resizing\n");\
+ \
+ pci_write_config_word(pdev, PCI_COMMAND, cmd); \
+pm_put: \
+ pci_config_pm_runtime_put(pdev); \
+unlock: \
+ device_unlock(dev); \
+ \
+ return ret ? ret : count; \
+} \
+static DEVICE_ATTR_RW(resource##n##_resize)
+
+pci_dev_resource_resize_attr(0);
+pci_dev_resource_resize_attr(1);
+pci_dev_resource_resize_attr(2);
+pci_dev_resource_resize_attr(3);
+pci_dev_resource_resize_attr(4);
+pci_dev_resource_resize_attr(5);
+
+static struct attribute *resource_resize_attrs[] = {
+ &dev_attr_resource0_resize.attr,
+ &dev_attr_resource1_resize.attr,
+ &dev_attr_resource2_resize.attr,
+ &dev_attr_resource3_resize.attr,
+ &dev_attr_resource4_resize.attr,
+ &dev_attr_resource5_resize.attr,
+ NULL,
+};
+
+static umode_t resource_resize_is_visible(struct kobject *kobj,
+ struct attribute *a, int n)
+{
+ struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
+
+ return pci_rebar_get_current_size(pdev, n) < 0 ? 0 : a->mode;
+}
+
+static const struct attribute_group pci_dev_resource_resize_group = {
+ .attrs = resource_resize_attrs,
+ .is_visible = resource_resize_is_visible,
+};
+
+int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
+{
+ if (!sysfs_initialized)
+ return -EACCES;
+
+ return pci_create_resource_files(pdev);
+}
+
+/**
+ * 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_resource_files(pdev);
+}
+
+static int __init pci_sysfs_init(void)
+{
+ struct pci_dev *pdev = NULL;
+ struct pci_bus *pbus = 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;
+ }
+ }
+
+ while ((pbus = pci_find_next_bus(pbus)))
+ pci_create_legacy_files(pbus);
+
+ 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,
+ &pci_dev_config_attr_group,
+ &pci_dev_rom_attr_group,
+ &pci_dev_reset_attr_group,
+ &pci_dev_reset_method_attr_group,
+ &pci_dev_vpd_attr_group,
+#ifdef CONFIG_DMI
+ &pci_dev_smbios_attr_group,
+#endif
+#ifdef CONFIG_ACPI
+ &pci_dev_acpi_attr_group,
+#endif
+ &pci_dev_resource_resize_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_pf_dev_attr_group,
+ &sriov_vf_dev_attr_group,
+#endif
+ &pci_bridge_attr_group,
+ &pcie_dev_attr_group,
+#ifdef CONFIG_PCIEAER
+ &aer_stats_attr_group,
+#endif
+#ifdef CONFIG_PCIEASPM
+ &aspm_ctrl_attr_group,
+#endif
+ NULL,
+};
+
+const struct device_type pci_dev_type = {
+ .groups = pci_dev_attr_groups,
+};