// SPDX-License-Identifier: GPL-2.0
/*
* Copyright IBM Corp. 2012
*
* Author(s):
* Jan Glauber <[email protected]>
*/
#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 int _do_recover(struct pci_dev *pdev, struct zpci_dev *zdev)
{
u8 status;
int ret;
pci_stop_and_remove_bus_device(pdev);
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)
return ret;
}
ret = zpci_enable_device(zdev);
if (ret)
return ret;
if (zdev->dma_table) {
ret = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
virt_to_phys(zdev->dma_table), &status);
if (ret)
zpci_disable_device(zdev);
}
return ret;
}
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 needs to be configured and state must not change */
mutex_lock(&zdev->state_lock);
if (zdev->state != ZPCI_FN_STATE_CONFIGURED)
goto out;
/* 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)) {
ret = _do_recover(pdev, zdev);
}
pci_rescan_bus(zdev->zbus->bus);
pci_unlock_rescan_remove();
out:
mutex_unlock(&zdev->state_lock);
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);
/* 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,
};
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,
&zpci_ident_attr_group,
NULL,
};
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