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 00000000000..d57ae71d32b
--- /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);