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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
commit5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch)
treea94efe259b9009378be6d90eb30d2b019d95c194 /arch/s390/pci/pci_sysfs.c
parentInitial commit. (diff)
downloadlinux-upstream.tar.xz
linux-upstream.zip
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--arch/s390/pci/pci_sysfs.c174
1 files changed, 174 insertions, 0 deletions
diff --git a/arch/s390/pci/pci_sysfs.c b/arch/s390/pci/pci_sysfs.c
new file mode 100644
index 000000000..5c028bee9
--- /dev/null
+++ b/arch/s390/pci/pci_sysfs.c
@@ -0,0 +1,174 @@
+// 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);
+ ret = zpci_disable_device(zdev);
+ if (ret)
+ goto out;
+
+ ret = zpci_enable_device(zdev);
+ if (ret)
+ 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 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,
+ 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,
+ NULL,
+};