| /* |
| * 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/topology.h> |
| #include <linux/mm.h> |
| #include <linux/capability.h> |
| #include <linux/pci-aspm.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); |
| ssize_t consumed = -EINVAL; |
| |
| if ((count > 0) && (*buf == '0' || *buf == '1')) { |
| pdev->broken_parity_status = *buf == '1' ? 1 : 0; |
| consumed = count; |
| } |
| return consumed; |
| } |
| |
| static ssize_t local_cpus_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| cpumask_t mask; |
| int len; |
| |
| mask = pcibus_to_cpumask(to_pci_dev(dev)->bus); |
| 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) |
| { |
| cpumask_t mask; |
| int len; |
| |
| mask = pcibus_to_cpumask(to_pci_dev(dev)->bus); |
| len = cpulist_scnprintf(buf, PAGE_SIZE-2, &mask); |
| buf[len++] = '\n'; |
| buf[len] = '\0'; |
| return len; |
| } |
| |
| /* 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 = 7; |
| resource_size_t start, end; |
| |
| if (pci_dev->subordinate) |
| max = DEVICE_COUNT_RESOURCE; |
| |
| 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) |
| { |
| ssize_t result = -EINVAL; |
| struct pci_dev *pdev = to_pci_dev(dev); |
| |
| /* this can crash the machine when done on the "wrong" device */ |
| if (!capable(CAP_SYS_ADMIN)) |
| return count; |
| |
| if (*buf == '0') { |
| if (atomic_read(&pdev->enable_cnt) != 0) |
| pci_disable_device(pdev); |
| else |
| result = -EIO; |
| } else if (*buf == '1') |
| 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 |
| 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); |
| |
| /* bad things may happen if the no_msi flag is changed |
| * while some drivers are loaded */ |
| if (!capable(CAP_SYS_ADMIN)) |
| return count; |
| |
| if (!pdev->subordinate) |
| return count; |
| |
| if (*buf == '0') { |
| pdev->subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI; |
| dev_warn(&pdev->dev, "forced subordinate bus to not support MSI," |
| " bad things could happen.\n"); |
| } |
| |
| if (*buf == '1') { |
| pdev->subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI; |
| dev_warn(&pdev->dev, "forced subordinate bus to support MSI," |
| " bad things could happen.\n"); |
| } |
| |
| return count; |
| } |
| |
| 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(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), |
| __ATTR_NULL, |
| }; |
| |
| static ssize_t |
| pci_read_config(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 (capable(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; |
| } |
| |
| 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 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 |
| pci_read_vpd(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)); |
| int end; |
| int ret; |
| |
| if (off > bin_attr->size) |
| count = 0; |
| else if (count > bin_attr->size - off) |
| count = bin_attr->size - off; |
| end = off + count; |
| |
| while (off < end) { |
| ret = dev->vpd->ops->read(dev, off, end - off, buf); |
| if (ret < 0) |
| return ret; |
| buf += ret; |
| off += ret; |
| } |
| |
| return count; |
| } |
| |
| static ssize_t |
| pci_write_vpd(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)); |
| int end; |
| int ret; |
| |
| if (off > bin_attr->size) |
| count = 0; |
| else if (count > bin_attr->size - off) |
| count = bin_attr->size - off; |
| end = off + count; |
| |
| while (off < end) { |
| ret = dev->vpd->ops->write(dev, off, end - off, buf); |
| if (ret < 0) |
| return ret; |
| buf += ret; |
| off += ret; |
| } |
| |
| return count; |
| } |
| |
| #ifdef HAVE_PCI_LEGACY |
| /** |
| * pci_read_legacy_io - read byte(s) from legacy I/O port space |
| * @kobj: kobject corresponding to file to read from |
| * @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 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 |
| * @kobj: kobject corresponding to file to read from |
| * @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 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 |
| * @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 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 |
| * @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 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_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 propogate 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; |
| |
| 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; |
| 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; |
| 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; |
| 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) |
| { |
| unsigned long nr, start, size; |
| |
| nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; |
| start = vma->vm_pgoff; |
| size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1; |
| if (start < size && size - start >= nr) |
| return 1; |
| WARN(1, "process \"%s\" tried to map 0x%08lx-0x%08lx on %s BAR %d (size 0x%08lx)\n", |
| current->comm, start, start+nr, pci_name(pdev), resno, size); |
| 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 = (struct resource *)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)) |
| 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 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 kobject *kobj, struct bin_attribute *attr, |
| struct vm_area_struct *vma) |
| { |
| return pci_mmap_resource(kobj, attr, vma, 1); |
| } |
| |
| /** |
| * pci_remove_resource_files - cleanup resource files |
| * @dev: dev to cleanup |
| * |
| * If we created resource files for @dev, 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); |
| |
| 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; |
| } |
| 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 |
| * @dev: dev in question |
| * |
| * Walk the resources in @dev 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 */ |
| static inline int pci_create_resource_files(struct pci_dev *dev) { return 0; } |
| static inline void 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 |
| * @kobj: kernel object handle |
| * @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 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 |
| * @kobj: kernel object handle |
| * @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 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) |
| return 0; |
| |
| 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 __attribute__ ((weak)) pcibios_add_platform_entries(struct pci_dev *dev) |
| { |
| return 0; |
| } |
| |
| 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; |
| |
| attr->size = dev->vpd->len; |
| attr->attr.name = "vpd"; |
| attr->attr.mode = S_IRUSR | S_IWUSR; |
| attr->read = pci_read_vpd; |
| attr->write = pci_write_vpd; |
| retval = sysfs_create_bin_file(&dev->dev.kobj, attr); |
| if (retval) { |
| kfree(dev->vpd->attr); |
| return retval; |
| } |
| dev->vpd->attr = attr; |
| } |
| |
| /* Active State Power Management */ |
| pcie_aspm_create_sysfs_dev_files(dev); |
| |
| return 0; |
| } |
| |
| 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; |
| } |
| attr->size = rom_size; |
| attr->attr.name = "rom"; |
| attr->attr.mode = S_IRUSR; |
| 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 platform-specific attributes */ |
| retval = pcibios_add_platform_entries(pdev); |
| if (retval) |
| goto err_rom_file; |
| |
| /* add sysfs entries for various capabilities */ |
| retval = pci_create_capabilities_sysfs(pdev); |
| if (retval) |
| goto err_rom_file; |
| |
| return 0; |
| |
| 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); |
| } |
| |
| /** |
| * 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); |
| } |
| } |
| |
| 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); |