[mirror_ubuntu-bionic-kernel.git] / drivers / pci / pci-sysfs.c

/*
 * 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/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, 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);
	strcat(buf,"\n"); 
	return 1+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(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, 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, 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;
}

#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;
	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;

	/* 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;

	return pci_mmap_page_range(pdev, vma, mmap_type, 0);
}

/**
 * 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);
		}
	}
}

/**
 * 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++) {
		struct bin_attribute *res_attr;

		/* skip empty resources */
		if (!pci_resource_len(pdev, i))
			continue;

		/* allocate attribute structure, piggyback attribute name */
		res_attr = kzalloc(sizeof(*res_attr) + 10, GFP_ATOMIC);
		if (res_attr) {
			char *res_attr_name = (char *)(res_attr + 1);

			pdev->res_attr[i] = res_attr;
			sprintf(res_attr_name, "resource%d", i);
			res_attr->attr.name = res_attr_name;
			res_attr->attr.mode = S_IRUSR | S_IWUSR;
			res_attr->attr.owner = THIS_MODULE;
			res_attr->size = pci_resource_len(pdev, i);
			res_attr->mmap = pci_mmap_resource;
			res_attr->private = &pdev->resource[i];
			retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
			if (retval) {
				pci_remove_resource_files(pdev);
				return retval;
			}
		} else {
			return -ENOMEM;
		}
	}
	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, 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 __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
{
	struct bin_attribute *rom_attr = NULL;
	int retval;

	if (!sysfs_initialized)
		return -EACCES;

	if (pdev->cfg_size < 4096)
		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_bin_file;

	/* If the device has a ROM, try to expose it in sysfs. */
	if (pci_resource_len(pdev, PCI_ROM_RESOURCE) ||
	    (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)) {
		rom_attr = kzalloc(sizeof(*rom_attr), GFP_ATOMIC);
		if (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;
			retval = sysfs_create_bin_file(&pdev->dev.kobj, rom_attr);
			if (retval)
				goto err_rom;
		} else {
			retval = -ENOMEM;
			goto err_bin_file;
		}
	}
	/* add platform-specific attributes */
	pcibios_add_platform_entries(pdev);

	return 0;

err_rom:
	kfree(rom_attr);
err_bin_file:
	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);
err:
	return retval;
}

/**
 * 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;

	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;
	int retval;

	sysfs_initialized = 1;
	for_each_pci_dev(pdev) {
		retval = pci_create_sysfs_dev_files(pdev);
		if (retval)
			return retval;
	}

	return 0;
}

late_initcall(pci_sysfs_init);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* drivers/pci/pci-sysfs.c
	3	*
	4	* (C) Copyright 2002-2004 Greg Kroah-Hartman <greg@kroah.com>
	5	* (C) Copyright 2002-2004 IBM Corp.
	6	* (C) Copyright 2003 Matthew Wilcox
	7	* (C) Copyright 2003 Hewlett-Packard
	8	* (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
	9	* (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
	10	*
	11	* File attributes for PCI devices
	12	*
	13	* Modeled after usb's driverfs.c
	14	*
	15	*/
	16
	17
1da177e4 LT	18	#include <linux/kernel.h>
	19	#include <linux/pci.h>
	20	#include <linux/stat.h>
	21	#include <linux/topology.h>
	22	#include <linux/mm.h>
	23
	24	#include "pci.h"
	25
	26	static int sysfs_initialized; /* = 0 */
	27
	28	/* show configuration fields */
	29	#define pci_config_attr(field, format_string) \
	30	static ssize_t \
e404e274	31	field##_show(struct device dev, struct device_attribute attr, char *buf) \
1da177e4 LT	32	{ \
	33	struct pci_dev *pdev; \
	34	\
	35	pdev = to_pci_dev (dev); \
	36	return sprintf (buf, format_string, pdev->field); \
	37	}
	38
	39	pci_config_attr(vendor, "0x%04x\n");
	40	pci_config_attr(device, "0x%04x\n");
	41	pci_config_attr(subsystem_vendor, "0x%04x\n");
	42	pci_config_attr(subsystem_device, "0x%04x\n");
	43	pci_config_attr(class, "0x%06x\n");
	44	pci_config_attr(irq, "%u\n");
	45
bdee9d98 DT	46	static ssize_t broken_parity_status_show(struct device *dev,
	47	struct device_attribute *attr,
	48	char *buf)
	49	{
	50	struct pci_dev *pdev = to_pci_dev(dev);
	51	return sprintf (buf, "%u\n", pdev->broken_parity_status);
	52	}
	53
	54	static ssize_t broken_parity_status_store(struct device *dev,
	55	struct device_attribute *attr,
	56	const char *buf, size_t count)
	57	{
	58	struct pci_dev *pdev = to_pci_dev(dev);
	59	ssize_t consumed = -EINVAL;
	60
	61	if ((count > 0) && (buf == '0' \|\| buf == '1')) {
	62	pdev->broken_parity_status = *buf == '1' ? 1 : 0;
	63	consumed = count;
	64	}
	65	return consumed;
	66	}
	67
4327edf6 AC	68	static ssize_t local_cpus_show(struct device *dev,
4327edf6 AC	69	struct device_attribute attr, char buf)
1da177e4	70	{
4327edf6 AC	71	cpumask_t mask;
	72	int len;
	73
	74	mask = pcibus_to_cpumask(to_pci_dev(dev)->bus);
	75	len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
1da177e4 LT	76	strcat(buf,"\n");
	77	return 1+len;
	78	}
	79
	80	/* show resources */
	81	static ssize_t
e404e274	82	resource_show(struct device * dev, struct device_attribute attr, char buf)
1da177e4 LT	83	{
	84	struct pci_dev * pci_dev = to_pci_dev(dev);
	85	char * str = buf;
	86	int i;
	87	int max = 7;
e31dd6e4	88	resource_size_t start, end;
1da177e4 LT	89
	90	if (pci_dev->subordinate)
	91	max = DEVICE_COUNT_RESOURCE;
	92
	93	for (i = 0; i < max; i++) {
2311b1f2 ME	94	struct resource *res = &pci_dev->resource[i];
	95	pci_resource_to_user(pci_dev, i, res, &start, &end);
	96	str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
	97	(unsigned long long)start,
	98	(unsigned long long)end,
	99	(unsigned long long)res->flags);
1da177e4 LT	100	}
	101	return (str - buf);
	102	}
	103
87c8a443	104	static ssize_t modalias_show(struct device dev, struct device_attribute attr, char *buf)
9888549e GKH	105	{
	106	struct pci_dev *pci_dev = to_pci_dev(dev);
	107
	108	return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
	109	pci_dev->vendor, pci_dev->device,
	110	pci_dev->subsystem_vendor, pci_dev->subsystem_device,
	111	(u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
	112	(u8)(pci_dev->class));
	113	}
bae94d02 IPG	114
	115	static ssize_t is_enabled_store(struct device *dev,
	116	struct device_attribute attr, const char buf,
	117	size_t count)
9f125d30	118	{
bae94d02	119	ssize_t result = -EINVAL;
9f125d30 AV	120	struct pci_dev *pdev = to_pci_dev(dev);
	121
	122	/* this can crash the machine when done on the "wrong" device */
	123	if (!capable(CAP_SYS_ADMIN))
	124	return count;
	125
bae94d02 IPG	126	if (*buf == '0') {
	127	if (atomic_read(&pdev->enable_cnt) != 0)
	128	pci_disable_device(pdev);
	129	else
	130	result = -EIO;
	131	} else if (*buf == '1')
	132	result = pci_enable_device(pdev);
9f125d30	133
bae94d02 IPG	134	return result < 0 ? result : count;
	135	}
	136
	137	static ssize_t is_enabled_show(struct device *dev,
	138	struct device_attribute attr, char buf)
	139	{
	140	struct pci_dev *pdev;
9f125d30	141
bae94d02 IPG	142	pdev = to_pci_dev (dev);
bae94d02 IPG	143	return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
9f125d30 AV	144	}
9f125d30 AV	145
81bb0e19 BG	146	#ifdef CONFIG_NUMA
	147	static ssize_t
	148	numa_node_show(struct device dev, struct device_attribute attr, char *buf)
	149	{
	150	return sprintf (buf, "%d\n", dev->numa_node);
	151	}
	152	#endif
	153
fe97064c BG	154	static ssize_t
	155	msi_bus_show(struct device dev, struct device_attribute attr, char *buf)
	156	{
	157	struct pci_dev *pdev = to_pci_dev(dev);
	158
	159	if (!pdev->subordinate)
	160	return 0;
	161
	162	return sprintf (buf, "%u\n",
	163	!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
	164	}
	165
	166	static ssize_t
	167	msi_bus_store(struct device dev, struct device_attribute attr,
	168	const char *buf, size_t count)
	169	{
	170	struct pci_dev *pdev = to_pci_dev(dev);
	171
	172	/* bad things may happen if the no_msi flag is changed
	173	* while some drivers are loaded */
	174	if (!capable(CAP_SYS_ADMIN))
	175	return count;
	176
	177	if (!pdev->subordinate)
	178	return count;
	179
	180	if (*buf == '0') {
	181	pdev->subordinate->bus_flags \|= PCI_BUS_FLAGS_NO_MSI;
	182	dev_warn(&pdev->dev, "forced subordinate bus to not support MSI,"
	183	" bad things could happen.\n");
	184	}
	185
	186	if (*buf == '1') {
	187	pdev->subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
	188	dev_warn(&pdev->dev, "forced subordinate bus to support MSI,"
	189	" bad things could happen.\n");
	190	}
	191
	192	return count;
	193	}
9888549e	194
1da177e4 LT	195	struct device_attribute pci_dev_attrs[] = {
	196	__ATTR_RO(resource),
	197	__ATTR_RO(vendor),
	198	__ATTR_RO(device),
	199	__ATTR_RO(subsystem_vendor),
	200	__ATTR_RO(subsystem_device),
	201	__ATTR_RO(class),
	202	__ATTR_RO(irq),
	203	__ATTR_RO(local_cpus),
9888549e	204	__ATTR_RO(modalias),
81bb0e19 BG	205	#ifdef CONFIG_NUMA
	206	__ATTR_RO(numa_node),
	207	#endif
9f125d30	208	__ATTR(enable, 0600, is_enabled_show, is_enabled_store),
bdee9d98 DT	209	__ATTR(broken_parity_status,(S_IRUGO\|S_IWUSR),
bdee9d98 DT	210	broken_parity_status_show,broken_parity_status_store),
fe97064c	211	__ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
1da177e4 LT	212	__ATTR_NULL,
	213	};
	214
	215	static ssize_t
	216	pci_read_config(struct kobject kobj, char buf, loff_t off, size_t count)
	217	{
	218	struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
	219	unsigned int size = 64;
	220	loff_t init_off = off;
4c0619ad	221	u8 data = (u8) buf;
1da177e4 LT	222
	223	/* Several chips lock up trying to read undefined config space */
	224	if (capable(CAP_SYS_ADMIN)) {
	225	size = dev->cfg_size;
	226	} else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
	227	size = 128;
	228	}
	229
	230	if (off > size)
	231	return 0;
	232	if (off + count > size) {
	233	size -= off;
	234	count = size;
	235	} else {
	236	size = count;
	237	}
	238
4c0619ad SS	239	if ((off & 1) && size) {
4c0619ad SS	240	u8 val;
e04b0ea2	241	pci_user_read_config_byte(dev, off, &val);
4c0619ad	242	data[off - init_off] = val;
1da177e4	243	off++;
4c0619ad SS	244	size--;
	245	}
	246
	247	if ((off & 3) && size > 2) {
	248	u16 val;
e04b0ea2	249	pci_user_read_config_word(dev, off, &val);
4c0619ad SS	250	data[off - init_off] = val & 0xff;
	251	data[off - init_off + 1] = (val >> 8) & 0xff;
	252	off += 2;
	253	size -= 2;
1da177e4 LT	254	}
	255
	256	while (size > 3) {
4c0619ad	257	u32 val;
e04b0ea2	258	pci_user_read_config_dword(dev, off, &val);
4c0619ad SS	259	data[off - init_off] = val & 0xff;
	260	data[off - init_off + 1] = (val >> 8) & 0xff;
	261	data[off - init_off + 2] = (val >> 16) & 0xff;
	262	data[off - init_off + 3] = (val >> 24) & 0xff;
1da177e4 LT	263	off += 4;
	264	size -= 4;
	265	}
	266
4c0619ad SS	267	if (size >= 2) {
4c0619ad SS	268	u16 val;
e04b0ea2	269	pci_user_read_config_word(dev, off, &val);
4c0619ad SS	270	data[off - init_off] = val & 0xff;
	271	data[off - init_off + 1] = (val >> 8) & 0xff;
	272	off += 2;
	273	size -= 2;
	274	}
	275
	276	if (size > 0) {
	277	u8 val;
e04b0ea2	278	pci_user_read_config_byte(dev, off, &val);
4c0619ad	279	data[off - init_off] = val;
1da177e4 LT	280	off++;
	281	--size;
	282	}
	283
	284	return count;
	285	}
	286
	287	static ssize_t
	288	pci_write_config(struct kobject kobj, char buf, loff_t off, size_t count)
	289	{
	290	struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
	291	unsigned int size = count;
	292	loff_t init_off = off;
4c0619ad	293	u8 data = (u8) buf;
1da177e4 LT	294
	295	if (off > dev->cfg_size)
	296	return 0;
	297	if (off + count > dev->cfg_size) {
	298	size = dev->cfg_size - off;
	299	count = size;
	300	}
4c0619ad SS	301
4c0619ad SS	302	if ((off & 1) && size) {
e04b0ea2	303	pci_user_write_config_byte(dev, off, data[off - init_off]);
1da177e4	304	off++;
4c0619ad	305	size--;
1da177e4	306	}
4c0619ad SS	307
	308	if ((off & 3) && size > 2) {
	309	u16 val = data[off - init_off];
	310	val \|= (u16) data[off - init_off + 1] << 8;
e04b0ea2	311	pci_user_write_config_word(dev, off, val);
4c0619ad SS	312	off += 2;
	313	size -= 2;
	314	}
1da177e4 LT	315
1da177e4 LT	316	while (size > 3) {
4c0619ad SS	317	u32 val = data[off - init_off];
	318	val \|= (u32) data[off - init_off + 1] << 8;
	319	val \|= (u32) data[off - init_off + 2] << 16;
	320	val \|= (u32) data[off - init_off + 3] << 24;
e04b0ea2	321	pci_user_write_config_dword(dev, off, val);
1da177e4 LT	322	off += 4;
	323	size -= 4;
	324	}
4c0619ad SS	325
	326	if (size >= 2) {
	327	u16 val = data[off - init_off];
	328	val \|= (u16) data[off - init_off + 1] << 8;
e04b0ea2	329	pci_user_write_config_word(dev, off, val);
4c0619ad SS	330	off += 2;
	331	size -= 2;
	332	}
1da177e4	333
4c0619ad	334	if (size) {
e04b0ea2	335	pci_user_write_config_byte(dev, off, data[off - init_off]);
1da177e4 LT	336	off++;
	337	--size;
	338	}
	339
	340	return count;
	341	}
	342
	343	#ifdef HAVE_PCI_LEGACY
	344	/**
	345	* pci_read_legacy_io - read byte(s) from legacy I/O port space
	346	* @kobj: kobject corresponding to file to read from
	347	* @buf: buffer to store results
	348	* @off: offset into legacy I/O port space
	349	* @count: number of bytes to read
	350	*
	351	* Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
	352	* callback routine (pci_legacy_read).
	353	*/
	354	ssize_t
	355	pci_read_legacy_io(struct kobject kobj, char buf, loff_t off, size_t count)
	356	{
	357	struct pci_bus *bus = to_pci_bus(container_of(kobj,
	358	struct class_device,
	359	kobj));
	360
	361	/* Only support 1, 2 or 4 byte accesses */
	362	if (count != 1 && count != 2 && count != 4)
	363	return -EINVAL;
	364
	365	return pci_legacy_read(bus, off, (u32 *)buf, count);
	366	}
	367
	368	/**
	369	* pci_write_legacy_io - write byte(s) to legacy I/O port space
	370	* @kobj: kobject corresponding to file to read from
	371	* @buf: buffer containing value to be written
	372	* @off: offset into legacy I/O port space
	373	* @count: number of bytes to write
	374	*
	375	* Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
	376	* callback routine (pci_legacy_write).
	377	*/
	378	ssize_t
	379	pci_write_legacy_io(struct kobject kobj, char buf, loff_t off, size_t count)
	380	{
	381	struct pci_bus *bus = to_pci_bus(container_of(kobj,
	382	struct class_device,
	383	kobj));
	384	/* Only support 1, 2 or 4 byte accesses */
	385	if (count != 1 && count != 2 && count != 4)
	386	return -EINVAL;
	387
	388	return pci_legacy_write(bus, off, (u32 )buf, count);
	389	}
	390
	391	/**
	392	* pci_mmap_legacy_mem - map legacy PCI memory into user memory space
	393	* @kobj: kobject corresponding to device to be mapped
	394	* @attr: struct bin_attribute for this file
	395	* @vma: struct vm_area_struct passed to mmap
	396	*
	397	* Uses an arch specific callback, pci_mmap_legacy_page_range, to mmap
	398	* legacy memory space (first meg of bus space) into application virtual
	399	* memory space.
400	*/
401	int
402	pci_mmap_legacy_mem(struct kobject kobj, struct bin_attribute attr,
403	struct vm_area_struct *vma)
404	{
405	struct pci_bus *bus = to_pci_bus(container_of(kobj,
406	struct class_device,
407	kobj));
408
409	return pci_mmap_legacy_page_range(bus, vma);
410	}
411	#endif /* HAVE_PCI_LEGACY */
412
413	#ifdef HAVE_PCI_MMAP
414	/**
415	* pci_mmap_resource - map a PCI resource into user memory space
416	* @kobj: kobject for mapping
417	* @attr: struct bin_attribute for the file being mapped
418	* @vma: struct vm_area_struct passed into the mmap
419	*
420	* Use the regular PCI mapping routines to map a PCI resource into userspace.
421	* FIXME: write combining? maybe automatic for prefetchable regions?
422	*/
423	static int
424	pci_mmap_resource(struct kobject kobj, struct bin_attribute attr,
425	struct vm_area_struct *vma)
426	{
427	struct pci_dev *pdev = to_pci_dev(container_of(kobj,
428	struct device, kobj));
429	struct resource res = (struct resource )attr->private;
430	enum pci_mmap_state mmap_type;
e31dd6e4	431	resource_size_t start, end;
2311b1f2	432	int i;
1da177e4	433
2311b1f2 ME	434	for (i = 0; i < PCI_ROM_RESOURCE; i++)
	435	if (res == &pdev->resource[i])
	436	break;
	437	if (i >= PCI_ROM_RESOURCE)
	438	return -ENODEV;
	439
	440	/* pci_mmap_page_range() expects the same kind of entry as coming
	441	* from /proc/bus/pci/ which is a "user visible" value. If this is
	442	* different from the resource itself, arch will do necessary fixup.
	443	*/
	444	pci_resource_to_user(pdev, i, res, &start, &end);
	445	vma->vm_pgoff += start >> PAGE_SHIFT;
1da177e4 LT	446	mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
	447
	448	return pci_mmap_page_range(pdev, vma, mmap_type, 0);
	449	}
	450
b19441af GKH	451	/**
	452	* pci_remove_resource_files - cleanup resource files
	453	* @dev: dev to cleanup
	454	*
	455	* If we created resource files for @dev, remove them from sysfs and
	456	* free their resources.
	457	*/
	458	static void
	459	pci_remove_resource_files(struct pci_dev *pdev)
	460	{
	461	int i;
	462
	463	for (i = 0; i < PCI_ROM_RESOURCE; i++) {
	464	struct bin_attribute *res_attr;
	465
	466	res_attr = pdev->res_attr[i];
	467	if (res_attr) {
	468	sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
	469	kfree(res_attr);
	470	}
	471	}
	472	}
	473
1da177e4 LT	474	/**
	475	* pci_create_resource_files - create resource files in sysfs for @dev
	476	* @dev: dev in question
	477	*
	478	* Walk the resources in @dev creating files for each resource available.
	479	*/
b19441af	480	static int pci_create_resource_files(struct pci_dev *pdev)
1da177e4 LT	481	{
1da177e4 LT	482	int i;
b19441af	483	int retval;
1da177e4 LT	484
	485	/* Expose the PCI resources from this device as files */
	486	for (i = 0; i < PCI_ROM_RESOURCE; i++) {
	487	struct bin_attribute *res_attr;
	488
	489	/* skip empty resources */
	490	if (!pci_resource_len(pdev, i))
	491	continue;
	492
d48593bf	493	/* allocate attribute structure, piggyback attribute name */
656da9da	494	res_attr = kzalloc(sizeof(*res_attr) + 10, GFP_ATOMIC);
1da177e4	495	if (res_attr) {
d48593bf DT	496	char res_attr_name = (char )(res_attr + 1);
d48593bf DT	497
1da177e4	498	pdev->res_attr[i] = res_attr;
d48593bf DT	499	sprintf(res_attr_name, "resource%d", i);
d48593bf DT	500	res_attr->attr.name = res_attr_name;
1da177e4 LT	501	res_attr->attr.mode = S_IRUSR \| S_IWUSR;
1da177e4 LT	502	res_attr->attr.owner = THIS_MODULE;
d48593bf	503	res_attr->size = pci_resource_len(pdev, i);
1da177e4 LT	504	res_attr->mmap = pci_mmap_resource;
1da177e4 LT	505	res_attr->private = &pdev->resource[i];
b19441af GKH	506	retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
	507	if (retval) {
	508	pci_remove_resource_files(pdev);
	509	return retval;
	510	}
	511	} else {
	512	return -ENOMEM;
1da177e4 LT	513	}
1da177e4 LT	514	}
b19441af	515	return 0;
1da177e4 LT	516	}
1da177e4 LT	517	#else /* !HAVE_PCI_MMAP */
b19441af	518	static inline int pci_create_resource_files(struct pci_dev *dev) { return 0; }
1da177e4 LT	519	static inline void pci_remove_resource_files(struct pci_dev *dev) { return; }
	520	#endif /* HAVE_PCI_MMAP */
	521
	522	/**
	523	* pci_write_rom - used to enable access to the PCI ROM display
	524	* @kobj: kernel object handle
	525	* @buf: user input
	526	* @off: file offset
	527	* @count: number of byte in input
	528	*
	529	* writing anything except 0 enables it
	530	*/
	531	static ssize_t
	532	pci_write_rom(struct kobject kobj, char buf, loff_t off, size_t count)
	533	{
	534	struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
	535
	536	if ((off == 0) && (*buf == '0') && (count == 2))
	537	pdev->rom_attr_enabled = 0;
	538	else
	539	pdev->rom_attr_enabled = 1;
	540
	541	return count;
	542	}
	543
	544	/**
	545	* pci_read_rom - read a PCI ROM
	546	* @kobj: kernel object handle
	547	* @buf: where to put the data we read from the ROM
	548	* @off: file offset
	549	* @count: number of bytes to read
	550	*
	551	* Put @count bytes starting at @off into @buf from the ROM in the PCI
	552	* device corresponding to @kobj.
	553	*/
	554	static ssize_t
	555	pci_read_rom(struct kobject kobj, char buf, loff_t off, size_t count)
	556	{
	557	struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
	558	void __iomem *rom;
	559	size_t size;
	560
	561	if (!pdev->rom_attr_enabled)
	562	return -EINVAL;
	563
	564	rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
	565	if (!rom)
	566	return 0;
	567
	568	if (off >= size)
	569	count = 0;
	570	else {
	571	if (off + count > size)
	572	count = size - off;
	573
	574	memcpy_fromio(buf, rom + off, count);
	575	}
	576	pci_unmap_rom(pdev, rom);
	577
	578	return count;
	579	}
	580
	581	static struct bin_attribute pci_config_attr = {
	582	.attr = {
583	.name = "config",
584	.mode = S_IRUGO \| S_IWUSR,
585	.owner = THIS_MODULE,
586	},
587	.size = 256,
588	.read = pci_read_config,
589	.write = pci_write_config,
590	};
591
592	static struct bin_attribute pcie_config_attr = {
593	.attr = {
594	.name = "config",
595	.mode = S_IRUGO \| S_IWUSR,
596	.owner = THIS_MODULE,
597	},
598	.size = 4096,
599	.read = pci_read_config,
600	.write = pci_write_config,
601	};
602
b19441af	603	int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
1da177e4	604	{
b19441af GKH	605	struct bin_attribute *rom_attr = NULL;
	606	int retval;
	607
1da177e4 LT	608	if (!sysfs_initialized)
	609	return -EACCES;
	610
	611	if (pdev->cfg_size < 4096)
b19441af	612	retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1da177e4	613	else
b19441af GKH	614	retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
	615	if (retval)
	616	goto err;
1da177e4	617
b19441af GKH	618	retval = pci_create_resource_files(pdev);
	619	if (retval)
	620	goto err_bin_file;
1da177e4 LT	621
1da177e4 LT	622	/* If the device has a ROM, try to expose it in sysfs. */
40ee9e9f JB	623	if (pci_resource_len(pdev, PCI_ROM_RESOURCE) \|\|
40ee9e9f JB	624	(pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)) {
f5afe806	625	rom_attr = kzalloc(sizeof(*rom_attr), GFP_ATOMIC);
1da177e4	626	if (rom_attr) {
1da177e4 LT	627	pdev->rom_attr = rom_attr;
	628	rom_attr->size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
	629	rom_attr->attr.name = "rom";
	630	rom_attr->attr.mode = S_IRUSR;
	631	rom_attr->attr.owner = THIS_MODULE;
	632	rom_attr->read = pci_read_rom;
	633	rom_attr->write = pci_write_rom;
b19441af GKH	634	retval = sysfs_create_bin_file(&pdev->dev.kobj, rom_attr);
	635	if (retval)
	636	goto err_rom;
	637	} else {
	638	retval = -ENOMEM;
	639	goto err_bin_file;
1da177e4 LT	640	}
	641	}
	642	/* add platform-specific attributes */
	643	pcibios_add_platform_entries(pdev);
b19441af	644
1da177e4	645	return 0;
b19441af GKH	646
	647	err_rom:
	648	kfree(rom_attr);
	649	err_bin_file:
	650	if (pdev->cfg_size < 4096)
	651	sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
	652	else
	653	sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
	654	err:
	655	return retval;
1da177e4 LT	656	}
	657
	658	/**
	659	* pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
	660	* @pdev: device whose entries we should free
	661	*
	662	* Cleanup when @pdev is removed from sysfs.
	663	*/
	664	void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
	665	{
d67afe5e DM	666	if (!sysfs_initialized)
	667	return;
	668
1da177e4 LT	669	if (pdev->cfg_size < 4096)
	670	sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
	671	else
	672	sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
	673
	674	pci_remove_resource_files(pdev);
	675
	676	if (pci_resource_len(pdev, PCI_ROM_RESOURCE)) {
	677	if (pdev->rom_attr) {
	678	sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
	679	kfree(pdev->rom_attr);
	680	}
	681	}
	682	}
	683
	684	static int __init pci_sysfs_init(void)
	685	{
	686	struct pci_dev *pdev = NULL;
b19441af GKH	687	int retval;
b19441af GKH	688
1da177e4	689	sysfs_initialized = 1;
b19441af GKH	690	for_each_pci_dev(pdev) {
	691	retval = pci_create_sysfs_dev_files(pdev);
	692	if (retval)
	693	return retval;
	694	}
1da177e4 LT	695
	696	return 0;
	697	}
	698
40ee9e9f	699	late_initcall(pci_sysfs_init);