[linux-block.git] / arch / s390 / pci / pci_sysfs.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright IBM Corp. 2012
 *
 * Author(s):
 *   Jan Glauber <jang@linux.vnet.ibm.com>
 */

#define KMSG_COMPONENT "zpci"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/kernel.h>
#include <linux/stat.h>
#include <linux/pci.h>

#include "../../../drivers/pci/pci.h"

#include <asm/sclp.h>

#define zpci_attr(name, fmt, member)					\
static ssize_t name##_show(struct device *dev,				\
			   struct device_attribute *attr, char *buf)	\
{									\
	struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));		\
									\
	return sprintf(buf, fmt, zdev->member);				\
}									\
static DEVICE_ATTR_RO(name)

zpci_attr(function_id, "0x%08x\n", fid);
zpci_attr(function_handle, "0x%08x\n", fh);
zpci_attr(pchid, "0x%04x\n", pchid);
zpci_attr(pfgid, "0x%02x\n", pfgid);
zpci_attr(vfn, "0x%04x\n", vfn);
zpci_attr(pft, "0x%02x\n", pft);
zpci_attr(port, "%d\n", port);
zpci_attr(uid, "0x%x\n", uid);
zpci_attr(segment0, "0x%02x\n", pfip[0]);
zpci_attr(segment1, "0x%02x\n", pfip[1]);
zpci_attr(segment2, "0x%02x\n", pfip[2]);
zpci_attr(segment3, "0x%02x\n", pfip[3]);

static ssize_t mio_enabled_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));

	return sprintf(buf, zpci_use_mio(zdev) ? "1\n" : "0\n");
}
static DEVICE_ATTR_RO(mio_enabled);

static ssize_t recover_store(struct device *dev, struct device_attribute *attr,
			     const char *buf, size_t count)
{
	struct kernfs_node *kn;
	struct pci_dev *pdev = to_pci_dev(dev);
	struct zpci_dev *zdev = to_zpci(pdev);
	int ret = 0;

	/* Can't use device_remove_self() here as that would lead us to lock
	 * the pci_rescan_remove_lock while holding the device' kernfs lock.
	 * This would create a possible deadlock with disable_slot() which is
	 * not directly protected by the device' kernfs lock but takes it
	 * during the device removal which happens under
	 * pci_rescan_remove_lock.
	 *
	 * This is analogous to sdev_store_delete() in
	 * drivers/scsi/scsi_sysfs.c
	 */
	kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
	WARN_ON_ONCE(!kn);
	/* device_remove_file() serializes concurrent calls ignoring all but
	 * the first
	 */
	device_remove_file(dev, attr);

	/* A concurrent call to recover_store() may slip between
	 * sysfs_break_active_protection() and the sysfs file removal.
	 * Once it unblocks from pci_lock_rescan_remove() the original pdev
	 * will already be removed.
	 */
	pci_lock_rescan_remove();
	if (pci_dev_is_added(pdev)) {
		pci_stop_and_remove_bus_device(pdev);
		if (zdev->dma_table) {
			ret = zpci_dma_exit_device(zdev);
			if (ret)
				goto out;
		}

		if (zdev_enabled(zdev)) {
			ret = zpci_disable_device(zdev);
			/*
			 * Due to a z/VM vs LPAR inconsistency in the error
			 * state the FH may indicate an enabled device but
			 * disable says the device is already disabled don't
			 * treat it as an error here.
			 */
			if (ret == -EINVAL)
				ret = 0;
			if (ret)
				goto out;
		}

		ret = zpci_enable_device(zdev);
		if (ret)
			goto out;
		ret = zpci_dma_init_device(zdev);
		if (ret) {
			zpci_disable_device(zdev);
			goto out;
		}
		pci_rescan_bus(zdev->zbus->bus);
	}
out:
	pci_unlock_rescan_remove();
	if (kn)
		sysfs_unbreak_active_protection(kn);
	return ret ? ret : count;
}
static DEVICE_ATTR_WO(recover);

static ssize_t util_string_read(struct file *filp, struct kobject *kobj,
				struct bin_attribute *attr, char *buf,
				loff_t off, size_t count)
{
	struct device *dev = kobj_to_dev(kobj);
	struct pci_dev *pdev = to_pci_dev(dev);
	struct zpci_dev *zdev = to_zpci(pdev);

	return memory_read_from_buffer(buf, count, &off, zdev->util_str,
				       sizeof(zdev->util_str));
}
static BIN_ATTR_RO(util_string, CLP_UTIL_STR_LEN);

static ssize_t report_error_write(struct file *filp, struct kobject *kobj,
				  struct bin_attribute *attr, char *buf,
				  loff_t off, size_t count)
{
	struct zpci_report_error_header *report = (void *) buf;
	struct device *dev = kobj_to_dev(kobj);
	struct pci_dev *pdev = to_pci_dev(dev);
	struct zpci_dev *zdev = to_zpci(pdev);
	int ret;

	if (off || (count < sizeof(*report)))
		return -EINVAL;

	ret = sclp_pci_report(report, zdev->fh, zdev->fid);

	return ret ? ret : count;
}
static BIN_ATTR(report_error, S_IWUSR, NULL, report_error_write, PAGE_SIZE);

static ssize_t uid_is_unique_show(struct device *dev,
				  struct device_attribute *attr, char *buf)
{
	return sysfs_emit(buf, "%d\n", zpci_unique_uid ? 1 : 0);
}
static DEVICE_ATTR_RO(uid_is_unique);

#ifndef CONFIG_DMI
/* analogous to smbios index */
static ssize_t index_show(struct device *dev,
			  struct device_attribute *attr, char *buf)
{
	struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
	u32 index = ~0;

	if (zpci_unique_uid)
		index = zdev->uid;

	return sysfs_emit(buf, "%u\n", index);
}
static DEVICE_ATTR_RO(index);

static umode_t zpci_index_is_visible(struct kobject *kobj,
				     struct attribute *attr, int n)
{
	return zpci_unique_uid ? attr->mode : 0;
}

static struct attribute *zpci_ident_attrs[] = {
	&dev_attr_index.attr,
	NULL,
};

static struct attribute_group zpci_ident_attr_group = {
	.attrs = zpci_ident_attrs,
	.is_visible = zpci_index_is_visible,
};
#endif

static struct bin_attribute *zpci_bin_attrs[] = {
	&bin_attr_util_string,
	&bin_attr_report_error,
	NULL,
};

static struct attribute *zpci_dev_attrs[] = {
	&dev_attr_function_id.attr,
	&dev_attr_function_handle.attr,
	&dev_attr_pchid.attr,
	&dev_attr_pfgid.attr,
	&dev_attr_pft.attr,
	&dev_attr_port.attr,
	&dev_attr_vfn.attr,
	&dev_attr_uid.attr,
	&dev_attr_recover.attr,
	&dev_attr_mio_enabled.attr,
	&dev_attr_uid_is_unique.attr,
	NULL,
};

static struct attribute_group zpci_attr_group = {
	.attrs = zpci_dev_attrs,
	.bin_attrs = zpci_bin_attrs,
};

static struct attribute *pfip_attrs[] = {
	&dev_attr_segment0.attr,
	&dev_attr_segment1.attr,
	&dev_attr_segment2.attr,
	&dev_attr_segment3.attr,
	NULL,
};
static struct attribute_group pfip_attr_group = {
	.name = "pfip",
	.attrs = pfip_attrs,
};

const struct attribute_group *zpci_attr_groups[] = {
	&zpci_attr_group,
	&pfip_attr_group,
#ifndef CONFIG_DMI
	&zpci_ident_attr_group,
#endif
	NULL,
};
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1e8da956 JG	2	/*
	3	* Copyright IBM Corp. 2012
	4	*
	5	* Author(s):
	6	* Jan Glauber <jang@linux.vnet.ibm.com>
	7	*/
	8
896cb7e6 GS	9	#define KMSG_COMPONENT "zpci"
896cb7e6 GS	10	#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
1e8da956 JG	11
	12	#include <linux/kernel.h>
	13	#include <linux/stat.h>
	14	#include <linux/pci.h>
	15
576c75e3 NS	16	#include "../../../drivers/pci/pci.h"
576c75e3 NS	17
368704a6 SO	18	#include <asm/sclp.h>
368704a6 SO	19
b346953d SO	20	#define zpci_attr(name, fmt, member) \
	21	static ssize_t name##_show(struct device *dev, \
	22	struct device_attribute attr, char buf) \
	23	{ \
198a5278	24	struct zpci_dev *zdev = to_zpci(to_pci_dev(dev)); \
b346953d SO	25	\
	26	return sprintf(buf, fmt, zdev->member); \
	27	} \
	28	static DEVICE_ATTR_RO(name)
	29
	30	zpci_attr(function_id, "0x%08x\n", fid);
	31	zpci_attr(function_handle, "0x%08x\n", fh);
	32	zpci_attr(pchid, "0x%04x\n", pchid);
	33	zpci_attr(pfgid, "0x%02x\n", pfgid);
ac4995b9 SO	34	zpci_attr(vfn, "0x%04x\n", vfn);
ac4995b9 SO	35	zpci_attr(pft, "0x%02x\n", pft);
e6ab7490	36	zpci_attr(port, "%d\n", port);
ac4995b9 SO	37	zpci_attr(uid, "0x%x\n", uid);
	38	zpci_attr(segment0, "0x%02x\n", pfip[0]);
	39	zpci_attr(segment1, "0x%02x\n", pfip[1]);
	40	zpci_attr(segment2, "0x%02x\n", pfip[2]);
	41	zpci_attr(segment3, "0x%02x\n", pfip[3]);
b346953d	42
8e4708b3 SO	43	static ssize_t mio_enabled_show(struct device *dev,
	44	struct device_attribute attr, char buf)
	45	{
	46	struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
	47
	48	return sprintf(buf, zpci_use_mio(zdev) ? "1\n" : "0\n");
	49	}
	50	static DEVICE_ATTR_RO(mio_enabled);
	51
b346953d	52	static ssize_t recover_store(struct device dev, struct device_attribute attr,
0b60f9ea	53	const char *buf, size_t count)
0ff70ec8	54	{
576c75e3	55	struct kernfs_node *kn;
0ff70ec8	56	struct pci_dev *pdev = to_pci_dev(dev);
198a5278	57	struct zpci_dev *zdev = to_zpci(pdev);
576c75e3 NS	58	int ret = 0;
	59
	60	/* Can't use device_remove_self() here as that would lead us to lock
	61	* the pci_rescan_remove_lock while holding the device' kernfs lock.
	62	* This would create a possible deadlock with disable_slot() which is
	63	* not directly protected by the device' kernfs lock but takes it
	64	* during the device removal which happens under
	65	* pci_rescan_remove_lock.
	66	*
	67	* This is analogous to sdev_store_delete() in
	68	* drivers/scsi/scsi_sysfs.c
	69	*/
	70	kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
	71	WARN_ON_ONCE(!kn);
	72	/* device_remove_file() serializes concurrent calls ignoring all but
	73	* the first
	74	*/
	75	device_remove_file(dev, attr);
	76
	77	/* A concurrent call to recover_store() may slip between
	78	* sysfs_break_active_protection() and the sysfs file removal.
	79	* Once it unblocks from pci_lock_rescan_remove() the original pdev
	80	* will already be removed.
	81	*/
2a01bd1b	82	pci_lock_rescan_remove();
576c75e3 NS	83	if (pci_dev_is_added(pdev)) {
576c75e3 NS	84	pci_stop_and_remove_bus_device(pdev);
1f3f7681 NS	85	if (zdev->dma_table) {
	86	ret = zpci_dma_exit_device(zdev);
	87	if (ret)
	88	goto out;
	89	}
	90
	91	if (zdev_enabled(zdev)) {
	92	ret = zpci_disable_device(zdev);
1c8174fd NS	93	/*
	94	* Due to a z/VM vs LPAR inconsistency in the error
	95	* state the FH may indicate an enabled device but
	96	* disable says the device is already disabled don't
	97	* treat it as an error here.
	98	*/
	99	if (ret == -EINVAL)
	100	ret = 0;
1f3f7681 NS	101	if (ret)
	102	goto out;
	103	}
576c75e3 NS	104
	105	ret = zpci_enable_device(zdev);
	106	if (ret)
	107	goto out;
1f3f7681 NS	108	ret = zpci_dma_init_device(zdev);
	109	if (ret) {
	110	zpci_disable_device(zdev);
	111	goto out;
	112	}
05bc1be6	113	pci_rescan_bus(zdev->zbus->bus);
576c75e3 NS	114	}
576c75e3 NS	115	out:
2a01bd1b	116	pci_unlock_rescan_remove();
576c75e3 NS	117	if (kn)
	118	sysfs_unbreak_active_protection(kn);
	119	return ret ? ret : count;
0ff70ec8	120	}
b346953d	121	static DEVICE_ATTR_WO(recover);
0ff70ec8	122
ac4995b9 SO	123	static ssize_t util_string_read(struct file filp, struct kobject kobj,
	124	struct bin_attribute attr, char buf,
	125	loff_t off, size_t count)
	126	{
	127	struct device *dev = kobj_to_dev(kobj);
	128	struct pci_dev *pdev = to_pci_dev(dev);
198a5278	129	struct zpci_dev *zdev = to_zpci(pdev);
ac4995b9 SO	130
	131	return memory_read_from_buffer(buf, count, &off, zdev->util_str,
	132	sizeof(zdev->util_str));
	133	}
	134	static BIN_ATTR_RO(util_string, CLP_UTIL_STR_LEN);
368704a6 SO	135
	136	static ssize_t report_error_write(struct file filp, struct kobject kobj,
	137	struct bin_attribute attr, char buf,
	138	loff_t off, size_t count)
	139	{
	140	struct zpci_report_error_header report = (void ) buf;
	141	struct device *dev = kobj_to_dev(kobj);
	142	struct pci_dev *pdev = to_pci_dev(dev);
	143	struct zpci_dev *zdev = to_zpci(pdev);
	144	int ret;
	145
	146	if (off \|\| (count < sizeof(*report)))
	147	return -EINVAL;
	148
	149	ret = sclp_pci_report(report, zdev->fh, zdev->fid);
	150
	151	return ret ? ret : count;
	152	}
	153	static BIN_ATTR(report_error, S_IWUSR, NULL, report_error_write, PAGE_SIZE);
	154
408f2c9c NS	155	static ssize_t uid_is_unique_show(struct device *dev,
	156	struct device_attribute attr, char buf)
	157	{
	158	return sysfs_emit(buf, "%d\n", zpci_unique_uid ? 1 : 0);
	159	}
	160	static DEVICE_ATTR_RO(uid_is_unique);
	161
81bbf039 NS	162	#ifndef CONFIG_DMI
	163	/* analogous to smbios index */
	164	static ssize_t index_show(struct device *dev,
	165	struct device_attribute attr, char buf)
	166	{
	167	struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
	168	u32 index = ~0;
	169
	170	if (zpci_unique_uid)
	171	index = zdev->uid;
	172
	173	return sysfs_emit(buf, "%u\n", index);
	174	}
	175	static DEVICE_ATTR_RO(index);
	176
	177	static umode_t zpci_index_is_visible(struct kobject *kobj,
	178	struct attribute *attr, int n)
	179	{
	180	return zpci_unique_uid ? attr->mode : 0;
	181	}
	182
	183	static struct attribute *zpci_ident_attrs[] = {
	184	&dev_attr_index.attr,
	185	NULL,
	186	};
	187
	188	static struct attribute_group zpci_ident_attr_group = {
	189	.attrs = zpci_ident_attrs,
	190	.is_visible = zpci_index_is_visible,
	191	};
	192	#endif
	193
ac4995b9 SO	194	static struct bin_attribute *zpci_bin_attrs[] = {
ac4995b9 SO	195	&bin_attr_util_string,
368704a6	196	&bin_attr_report_error,
ac4995b9 SO	197	NULL,
	198	};
	199
93065d04 SO	200	static struct attribute *zpci_dev_attrs[] = {
	201	&dev_attr_function_id.attr,
	202	&dev_attr_function_handle.attr,
	203	&dev_attr_pchid.attr,
	204	&dev_attr_pfgid.attr,
ac4995b9	205	&dev_attr_pft.attr,
e6ab7490	206	&dev_attr_port.attr,
ac4995b9 SO	207	&dev_attr_vfn.attr,
ac4995b9 SO	208	&dev_attr_uid.attr,
93065d04	209	&dev_attr_recover.attr,
8e4708b3	210	&dev_attr_mio_enabled.attr,
408f2c9c	211	&dev_attr_uid_is_unique.attr,
93065d04 SO	212	NULL,
93065d04 SO	213	};
408f2c9c	214
93065d04 SO	215	static struct attribute_group zpci_attr_group = {
93065d04 SO	216	.attrs = zpci_dev_attrs,
ac4995b9 SO	217	.bin_attrs = zpci_bin_attrs,
	218	};
	219
	220	static struct attribute *pfip_attrs[] = {
	221	&dev_attr_segment0.attr,
	222	&dev_attr_segment1.attr,
	223	&dev_attr_segment2.attr,
	224	&dev_attr_segment3.attr,
	225	NULL,
	226	};
	227	static struct attribute_group pfip_attr_group = {
	228	.name = "pfip",
	229	.attrs = pfip_attrs,
93065d04	230	};
ac4995b9	231
93065d04 SO	232	const struct attribute_group *zpci_attr_groups[] = {
93065d04 SO	233	&zpci_attr_group,
ac4995b9	234	&pfip_attr_group,
81bbf039 NS	235	#ifndef CONFIG_DMI
	236	&zpci_ident_attr_group,
	237	#endif
1e8da956 JG	238	NULL,
1e8da956 JG	239	};