/* * drivers/pci/pci-sysfs.c * * (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/pci-aspm.h> #include <linux/slab.h> #include <linux/vgaarb.h> #include <linux/pm_runtime.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); \ } 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(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 (strict_strtoul(buf, 0, &val) < 0) return -EINVAL; pdev->broken_parity_status = !!val; return count; } static ssize_t local_cpus_show(struct device *dev, struct device_attribute *attr, char *buf) { const struct cpumask *mask; int len; #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 len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask); buf[len++] = '\n'; buf[len] = '\0'; return len; } static ssize_t local_cpulist_show(struct device *dev, struct device_attribute *attr, char *buf) { const struct cpumask *mask; int len; #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 len = cpulist_scnprintf(buf, PAGE_SIZE-2, mask); buf[len++] = '\n'; buf[len] = '\0'; return len; } /* * PCI Bus Class Devices */ static ssize_t pci_bus_show_cpuaffinity(struct device *dev, int type, struct device_attribute *attr, char *buf) { int ret; const struct cpumask *cpumask; cpumask = cpumask_of_pcibus(to_pci_bus(dev)); ret = type ? cpulist_scnprintf(buf, PAGE_SIZE-2, cpumask) : cpumask_scnprintf(buf, PAGE_SIZE-2, cpumask); buf[ret++] = '\n'; buf[ret] = '\0'; return ret; } static inline ssize_t pci_bus_show_cpumaskaffinity(struct device *dev, struct device_attribute *attr, char *buf) { return pci_bus_show_cpuaffinity(dev, 0, attr, buf); } static inline ssize_t pci_bus_show_cpulistaffinity(struct device *dev, struct device_attribute *attr, char *buf) { return pci_bus_show_cpuaffinity(dev, 1, attr, buf); } /* 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 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 ssize_t is_enabled_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 = strict_strtoul(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; if (!val) { if (pci_is_enabled(pdev)) pci_disable_device(pdev); else result = -EIO; } else result = pci_enable_device(pdev); return result < 0 ? result : count; } static ssize_t is_enabled_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)); } #ifdef CONFIG_NUMA static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr, char *buf) { return sprintf (buf, "%d\n", dev->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 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 ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf) { struct pci_dev *pdev = to_pci_dev(dev); if (!pdev->subordinate) return 0; return sprintf (buf, "%u\n", !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_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); unsigned long val; if (strict_strtoul(buf, 0, &val) < 0) return -EINVAL; /* bad things may happen if the no_msi flag is changed * while some drivers are loaded */ if (!capable(CAP_SYS_ADMIN)) return -EPERM; /* Maybe pci devices without subordinate busses shouldn't even have this * attribute in the first place? */ if (!pdev->subordinate) return count; /* Is the flag going to change, or keep the value it already had? */ if (!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) ^ !!val) { pdev->subordinate->bus_flags ^= PCI_BUS_FLAGS_NO_MSI; dev_warn(&pdev->dev, "forced subordinate bus to%s support MSI," " bad things could happen\n", val ? "" : " not"); } return count; } #ifdef CONFIG_HOTPLUG static DEFINE_MUTEX(pci_remove_rescan_mutex); static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf, size_t count) { unsigned long val; struct pci_bus *b = NULL; if (strict_strtoul(buf, 0, &val) < 0) return -EINVAL; if (val) { mutex_lock(&pci_remove_rescan_mutex); while ((b = pci_find_next_bus(b)) != NULL) pci_rescan_bus(b); mutex_unlock(&pci_remove_rescan_mutex); } return count; } struct bus_attribute pci_bus_attrs[] = { __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store), __ATTR_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 (strict_strtoul(buf, 0, &val) < 0) return -EINVAL; if (val) { mutex_lock(&pci_remove_rescan_mutex); pci_rescan_bus(pdev->bus); mutex_unlock(&pci_remove_rescan_mutex); } return count; } static void remove_callback(struct device *dev) { struct pci_dev *pdev = to_pci_dev(dev); mutex_lock(&pci_remove_rescan_mutex); pci_stop_and_remove_bus_device(pdev); mutex_unlock(&pci_remove_rescan_mutex); } static ssize_t remove_store(struct device *dev, struct device_attribute *dummy, const char *buf, size_t count) { int ret = 0; unsigned long val; if (strict_strtoul(buf, 0, &val) < 0) return -EINVAL; /* An attribute cannot be unregistered by one of its own methods, * so we have to use this roundabout approach. */ if (val) ret = device_schedule_callback(dev, remove_callback); if (ret) count = ret; return count; } 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 (strict_strtoul(buf, 0, &val) < 0) return -EINVAL; if (val) { mutex_lock(&pci_remove_rescan_mutex); if (!pci_is_root_bus(bus) && list_empty(&bus->devices)) pci_rescan_bus_bridge_resize(bus->self); else pci_rescan_bus(bus); mutex_unlock(&pci_remove_rescan_mutex); } return count; } #endif #if defined(CONFIG_PM_RUNTIME) && 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 (strict_strtoul(buf, 0, &val) < 0) return -EINVAL; pdev->d3cold_allowed = !!val; 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); } #endif struct device_attribute pci_dev_attrs[] = { __ATTR_RO(resource), __ATTR_RO(vendor), __ATTR_RO(device), __ATTR_RO(subsystem_vendor), __ATTR_RO(subsystem_device), __ATTR_RO(class), __ATTR_RO(irq), __ATTR_RO(local_cpus), __ATTR_RO(local_cpulist), __ATTR_RO(modalias), #ifdef CONFIG_NUMA __ATTR_RO(numa_node), #endif __ATTR_RO(dma_mask_bits), __ATTR_RO(consistent_dma_mask_bits), __ATTR(enable, 0600, is_enabled_show, is_enabled_store), __ATTR(broken_parity_status,(S_IRUGO|S_IWUSR), broken_parity_status_show,broken_parity_status_store), __ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store), #ifdef CONFIG_HOTPLUG __ATTR(remove, (S_IWUSR|S_IWGRP), NULL, remove_store), __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_rescan_store), #endif #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI) __ATTR(d3cold_allowed, 0644, d3cold_allowed_show, d3cold_allowed_store), #endif __ATTR_NULL, }; struct device_attribute pcibus_dev_attrs[] = { #ifdef CONFIG_HOTPLUG __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store), #endif __ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpumaskaffinity, NULL), __ATTR(cpulistaffinity, S_IRUGO, pci_bus_show_cpulistaffinity, NULL), __ATTR_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)); } 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(container_of(kobj,struct device,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 (security_capable(filp->f_cred, &init_user_ns, CAP_SYS_ADMIN) == 0) { 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; } 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; } 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(container_of(kobj,struct device,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; } 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; } return count; } static ssize_t read_vpd_attr(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(container_of(kobj, struct device, kobj)); if (off > bin_attr->size) count = 0; else if (count > bin_attr->size - off) count = bin_attr->size - off; return pci_read_vpd(dev, off, count, buf); } static ssize_t write_vpd_attr(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(container_of(kobj, struct device, kobj)); if (off > bin_attr->size) count = 0; else if (count > bin_attr->size - off) count = bin_attr->size - off; return pci_write_vpd(dev, off, count, buf); } #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(container_of(kobj, struct device, 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(container_of(kobj, struct device, 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(container_of(kobj, struct device, 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(container_of(kobj, struct device, 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) { return; } /** * 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 = kzalloc(sizeof(struct bin_attribute) * 2, 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 = S_IRUSR | S_IWUSR; 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 = S_IRUSR | S_IWUSR; 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: printk(KERN_WARNING "pci: warning: could not create legacy I/O port " "and ISA memory resources to sysfs\n"); return; } 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 */ #ifdef HAVE_PCI_MMAP 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, pci_start; if (pci_resource_len(pdev, resno) == 0) return 0; nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; start = vma->vm_pgoff; size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1; pci_start = (mmap_api == PCI_MMAP_PROCFS) ? pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0; 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(container_of(kobj, struct device, kobj)); struct resource *res = attr->private; enum pci_mmap_state mmap_type; resource_size_t start, end; int i; for (i = 0; i < PCI_ROM_RESOURCE; i++) if (res == &pdev->resource[i]) break; if (i >= PCI_ROM_RESOURCE) return -ENODEV; if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) { WARN(1, "process \"%s\" tried to map 0x%08lx bytes " "at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n", current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff, pci_name(pdev), i, (u64)pci_resource_start(pdev, i), (u64)pci_resource_len(pdev, i)); return -EINVAL; } /* pci_mmap_page_range() expects the same kind of entry as coming * from /proc/bus/pci/ which is a "user visible" value. If this is * different from the resource itself, arch will do necessary fixup. */ pci_resource_to_user(pdev, i, res, &start, &end); vma->vm_pgoff += start >> PAGE_SHIFT; mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io; if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start)) return -EINVAL; return pci_mmap_page_range(pdev, 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(container_of(kobj, struct device, kobj)); struct resource *res = attr->private; unsigned long port = off; int i; for (i = 0; i < PCI_ROM_RESOURCE; i++) if (res == &pdev->resource[i]) break; if (i >= PCI_ROM_RESOURCE) return -ENODEV; port += pci_resource_start(pdev, i); if (port > pci_resource_end(pdev, i)) return 0; if (port + count - 1 > pci_resource_end(pdev, i)) 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) { return pci_resource_io(filp, kobj, attr, buf, off, count, true); } /** * pci_remove_resource_files - cleanup resource files * @pdev: dev to cleanup * * If we created resource files for @pdev, remove them from sysfs and * free their resources. */ static void pci_remove_resource_files(struct pci_dev *pdev) { int i; for (i = 0; i < PCI_ROM_RESOURCE; i++) { struct bin_attribute *res_attr; res_attr = pdev->res_attr[i]; if (res_attr) { sysfs_remove_bin_file(&pdev->dev.kobj, res_attr); kfree(res_attr); } res_attr = pdev->res_attr_wc[i]; if (res_attr) { sysfs_remove_bin_file(&pdev->dev.kobj, res_attr); kfree(res_attr); } } } static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine) { /* allocate attribute structure, piggyback attribute name */ int name_len = write_combine ? 13 : 10; struct bin_attribute *res_attr; int retval; res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC); if (res_attr) { char *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); res_attr->mmap = pci_mmap_resource_uc; } if (pci_resource_flags(pdev, num) & IORESOURCE_IO) { res_attr->read = pci_read_resource_io; res_attr->write = pci_write_resource_io; } res_attr->attr.name = res_attr_name; res_attr->attr.mode = S_IRUSR | S_IWUSR; res_attr->size = pci_resource_len(pdev, num); res_attr->private = &pdev->resource[num]; retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr); } else retval = -ENOMEM; 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_ROM_RESOURCE; i++) { /* skip empty resources */ if (!pci_resource_len(pdev, i)) continue; retval = pci_create_attr(pdev, i, 0); /* for prefetchable resources, create a WC mappable file */ if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH) retval = pci_create_attr(pdev, i, 1); if (retval) { pci_remove_resource_files(pdev); return retval; } } return 0; } #else /* !HAVE_PCI_MMAP */ int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; } void __weak pci_remove_resource_files(struct pci_dev *dev) { return; } #endif /* HAVE_PCI_MMAP */ /** * pci_write_rom - used to enable access to the PCI ROM display * @filp: sysfs file * @kobj: kernel object handle * @bin_attr: struct bin_attribute for this file * @buf: user input * @off: file offset * @count: number of byte in input * * writing anything except 0 enables it */ static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj, struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count) { struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, 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(container_of(kobj, struct device, 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 struct bin_attribute pci_config_attr = { .attr = { .name = "config", .mode = S_IRUGO | S_IWUSR, }, .size = PCI_CFG_SPACE_SIZE, .read = pci_read_config, .write = pci_write_config, }; static struct bin_attribute pcie_config_attr = { .attr = { .name = "config", .mode = S_IRUGO | S_IWUSR, }, .size = PCI_CFG_SPACE_EXP_SIZE, .read = pci_read_config, .write = pci_write_config, }; int __weak pcibios_add_platform_entries(struct pci_dev *dev) { return 0; } 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 = strict_strtoul(buf, 0, &val); if (result < 0) return result; if (val != 1) return -EINVAL; result = pci_reset_function(pdev); if (result < 0) return result; return count; } static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store); static int pci_create_capabilities_sysfs(struct pci_dev *dev) { int retval; struct bin_attribute *attr; /* If the device has VPD, try to expose it in sysfs. */ if (dev->vpd) { attr = kzalloc(sizeof(*attr), GFP_ATOMIC); if (!attr) return -ENOMEM; sysfs_bin_attr_init(attr); attr->size = dev->vpd->len; attr->attr.name = "vpd"; attr->attr.mode = S_IRUSR | S_IWUSR; attr->read = read_vpd_attr; attr->write = write_vpd_attr; retval = sysfs_create_bin_file(&dev->dev.kobj, attr); if (retval) { kfree(attr); return retval; } dev->vpd->attr = attr; } /* Active State Power Management */ pcie_aspm_create_sysfs_dev_files(dev); if (!pci_probe_reset_function(dev)) { retval = device_create_file(&dev->dev, &reset_attr); if (retval) goto error; dev->reset_fn = 1; } return 0; error: pcie_aspm_remove_sysfs_dev_files(dev); if (dev->vpd && dev->vpd->attr) { sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr); kfree(dev->vpd->attr); } return retval; } int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev) { int retval; int rom_size = 0; struct bin_attribute *attr; if (!sysfs_initialized) return -EACCES; if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE) retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr); else retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr); if (retval) goto err; retval = pci_create_resource_files(pdev); if (retval) goto err_config_file; if (pci_resource_len(pdev, PCI_ROM_RESOURCE)) rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE); else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW) rom_size = 0x20000; /* If the device has a ROM, try to expose it in sysfs. */ 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 = S_IRUSR | S_IWUSR; 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; } if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA) { retval = device_create_file(&pdev->dev, &vga_attr); if (retval) goto err_rom_file; } /* add platform-specific attributes */ retval = pcibios_add_platform_entries(pdev); if (retval) goto err_vga_file; /* add sysfs entries for various capabilities */ retval = pci_create_capabilities_sysfs(pdev); if (retval) goto err_vga_file; pci_create_firmware_label_files(pdev); return 0; err_vga_file: if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA) device_remove_file(&pdev->dev, &vga_attr); err_rom_file: if (rom_size) { 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_EXP_SIZE) sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr); else sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr); err: return retval; } static void pci_remove_capabilities_sysfs(struct pci_dev *dev) { if (dev->vpd && dev->vpd->attr) { sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr); kfree(dev->vpd->attr); } pcie_aspm_remove_sysfs_dev_files(dev); if (dev->reset_fn) { device_remove_file(&dev->dev, &reset_attr); 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) { int rom_size = 0; if (!sysfs_initialized) return; pci_remove_capabilities_sysfs(pdev); if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE) sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr); else sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr); pci_remove_resource_files(pdev); if (pci_resource_len(pdev, PCI_ROM_RESOURCE)) rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE); else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW) rom_size = 0x20000; if (rom_size && pdev->rom_attr) { sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr); kfree(pdev->rom_attr); } 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);