// SPDX-License-Identifier: GPL-2.0 /* * (C) Copyright 2002-2004 Greg Kroah-Hartman * (C) Copyright 2002-2004 IBM Corp. * (C) Copyright 2003 Matthew Wilcox * (C) Copyright 2003 Hewlett-Packard * (C) Copyright 2004 Jon Smirl * (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes * * File attributes for PCI devices * * Modeled after usb's driverfs.c */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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", 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 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; 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 sprintf(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 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 = scnprintf(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_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) { pdev->res_attr_wc[num] = res_attr; sprintf(res_attr_name, "resource%d_wc", num); res_attr->mmap = pci_mmap_resource_wc; } else { pdev->res_attr[num] = res_attr; 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; } /** * 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 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); if (dev->reset_fn) { retval = device_create_file(&dev->dev, &dev_attr_reset); if (retval) goto error; } return 0; error: 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); 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_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 #ifdef CONFIG_PCIEASPM &aspm_ctrl_attr_group, #endif NULL, }; const struct device_type pci_dev_type = { .groups = pci_dev_attr_groups, };