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path: root/drivers/pci/pci-sysfs.c
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Diffstat (limited to 'drivers/pci/pci-sysfs.c')
-rw-r--r--drivers/pci/pci-sysfs.c490
1 files changed, 490 insertions, 0 deletions
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
new file mode 100644
index 000000000000..d57ae71d32b1
--- /dev/null
+++ b/drivers/pci/pci-sysfs.c
@@ -0,0 +1,490 @@
+/*
+ * 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/config.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/stat.h>
+#include <linux/topology.h>
+#include <linux/mm.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, 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 local_cpus_show(struct device *dev, char *buf)
+{
+ cpumask_t mask = pcibus_to_cpumask(to_pci_dev(dev)->bus);
+ int len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
+ strcat(buf,"\n");
+ return 1+len;
+}
+
+/* show resources */
+static ssize_t
+resource_show(struct device * dev, char * buf)
+{
+ struct pci_dev * pci_dev = to_pci_dev(dev);
+ char * str = buf;
+ int i;
+ int max = 7;
+
+ if (pci_dev->subordinate)
+ max = DEVICE_COUNT_RESOURCE;
+
+ for (i = 0; i < max; i++) {
+ str += sprintf(str,"0x%016lx 0x%016lx 0x%016lx\n",
+ pci_resource_start(pci_dev,i),
+ pci_resource_end(pci_dev,i),
+ pci_resource_flags(pci_dev,i));
+ }
+ return (str - buf);
+}
+
+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_NULL,
+};
+
+static ssize_t
+pci_read_config(struct kobject *kobj, 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;
+
+ /* 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;
+ }
+
+ while (off & 3) {
+ unsigned char val;
+ pci_read_config_byte(dev, off, &val);
+ buf[off - init_off] = val;
+ off++;
+ if (--size == 0)
+ break;
+ }
+
+ while (size > 3) {
+ unsigned int val;
+ pci_read_config_dword(dev, off, &val);
+ buf[off - init_off] = val & 0xff;
+ buf[off - init_off + 1] = (val >> 8) & 0xff;
+ buf[off - init_off + 2] = (val >> 16) & 0xff;
+ buf[off - init_off + 3] = (val >> 24) & 0xff;
+ off += 4;
+ size -= 4;
+ }
+
+ while (size > 0) {
+ unsigned char val;
+ pci_read_config_byte(dev, off, &val);
+ buf[off - init_off] = val;
+ off++;
+ --size;
+ }
+
+ return count;
+}
+
+static ssize_t
+pci_write_config(struct kobject *kobj, 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;
+
+ if (off > dev->cfg_size)
+ return 0;
+ if (off + count > dev->cfg_size) {
+ size = dev->cfg_size - off;
+ count = size;
+ }
+
+ while (off & 3) {
+ pci_write_config_byte(dev, off, buf[off - init_off]);
+ off++;
+ if (--size == 0)
+ break;
+ }
+
+ while (size > 3) {
+ unsigned int val = buf[off - init_off];
+ val |= (unsigned int) buf[off - init_off + 1] << 8;
+ val |= (unsigned int) buf[off - init_off + 2] << 16;
+ val |= (unsigned int) buf[off - init_off + 3] << 24;
+ pci_write_config_dword(dev, off, val);
+ off += 4;
+ size -= 4;
+ }
+
+ while (size > 0) {
+ pci_write_config_byte(dev, off, buf[off - init_off]);
+ off++;
+ --size;
+ }
+
+ 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).
+ */
+ssize_t
+pci_read_legacy_io(struct kobject *kobj, char *buf, loff_t off, size_t count)
+{
+ struct pci_bus *bus = to_pci_bus(container_of(kobj,
+ struct class_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).
+ */
+ssize_t
+pci_write_legacy_io(struct kobject *kobj, char *buf, loff_t off, size_t count)
+{
+ struct pci_bus *bus = to_pci_bus(container_of(kobj,
+ struct class_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_page_range, to mmap
+ * legacy memory space (first meg of bus space) into application virtual
+ * memory space.
+ */
+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 class_device,
+ kobj));
+
+ return pci_mmap_legacy_page_range(bus, vma);
+}
+#endif /* HAVE_PCI_LEGACY */
+
+#ifdef HAVE_PCI_MMAP
+/**
+ * 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
+ *
+ * Use the regular PCI mapping routines to map a PCI resource into userspace.
+ * FIXME: write combining? maybe automatic for prefetchable regions?
+ */
+static int
+pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
+ struct vm_area_struct *vma)
+{
+ 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;
+
+ vma->vm_pgoff += res->start >> PAGE_SHIFT;
+ mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
+
+ return pci_mmap_page_range(pdev, vma, mmap_type, 0);
+}
+
+/**
+ * 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 void
+pci_create_resource_files(struct pci_dev *pdev)
+{
+ int i;
+
+ /* Expose the PCI resources from this device as files */
+ for (i = 0; i < PCI_ROM_RESOURCE; i++) {
+ struct bin_attribute *res_attr;
+
+ /* skip empty resources */
+ if (!pci_resource_len(pdev, i))
+ continue;
+
+ res_attr = kmalloc(sizeof(*res_attr) + 10, GFP_ATOMIC);
+ if (res_attr) {
+ memset(res_attr, 0, sizeof(*res_attr) + 10);
+ pdev->res_attr[i] = res_attr;
+ /* Allocated above after the res_attr struct */
+ res_attr->attr.name = (char *)(res_attr + 1);
+ sprintf(res_attr->attr.name, "resource%d", i);
+ res_attr->size = pci_resource_len(pdev, i);
+ res_attr->attr.mode = S_IRUSR | S_IWUSR;
+ res_attr->attr.owner = THIS_MODULE;
+ res_attr->mmap = pci_mmap_resource;
+ res_attr->private = &pdev->resource[i];
+ sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
+ }
+ }
+}
+
+/**
+ * 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);
+ }
+ }
+}
+#else /* !HAVE_PCI_MMAP */
+static inline void pci_create_resource_files(struct pci_dev *dev) { return; }
+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, 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, 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,
+ .owner = THIS_MODULE,
+ },
+ .size = 256,
+ .read = pci_read_config,
+ .write = pci_write_config,
+};
+
+static struct bin_attribute pcie_config_attr = {
+ .attr = {
+ .name = "config",
+ .mode = S_IRUGO | S_IWUSR,
+ .owner = THIS_MODULE,
+ },
+ .size = 4096,
+ .read = pci_read_config,
+ .write = pci_write_config,
+};
+
+int pci_create_sysfs_dev_files (struct pci_dev *pdev)
+{
+ if (!sysfs_initialized)
+ return -EACCES;
+
+ if (pdev->cfg_size < 4096)
+ sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
+ else
+ sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
+
+ pci_create_resource_files(pdev);
+
+ /* If the device has a ROM, try to expose it in sysfs. */
+ if (pci_resource_len(pdev, PCI_ROM_RESOURCE)) {
+ struct bin_attribute *rom_attr;
+
+ rom_attr = kmalloc(sizeof(*rom_attr), GFP_ATOMIC);
+ if (rom_attr) {
+ memset(rom_attr, 0x00, sizeof(*rom_attr));
+ pdev->rom_attr = rom_attr;
+ rom_attr->size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
+ rom_attr->attr.name = "rom";
+ rom_attr->attr.mode = S_IRUSR;
+ rom_attr->attr.owner = THIS_MODULE;
+ rom_attr->read = pci_read_rom;
+ rom_attr->write = pci_write_rom;
+ sysfs_create_bin_file(&pdev->dev.kobj, rom_attr);
+ }
+ }
+ /* add platform-specific attributes */
+ pcibios_add_platform_entries(pdev);
+
+ return 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 (pdev->cfg_size < 4096)
+ 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)) {
+ if (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;
+
+ sysfs_initialized = 1;
+ for_each_pci_dev(pdev)
+ pci_create_sysfs_dev_files(pdev);
+
+ return 0;
+}
+
+__initcall(pci_sysfs_init);
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-11-06 18:03:14 +0100