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231 lines
5.8 KiB
231 lines
5.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright IBM Corp. 2012 |
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* |
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* Author(s): |
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* Jan Glauber <[email protected]> |
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*/ |
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#define KMSG_COMPONENT "zpci" |
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
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#include <linux/kernel.h> |
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#include <linux/stat.h> |
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#include <linux/pci.h> |
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#include "../../../drivers/pci/pci.h" |
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#include <asm/sclp.h> |
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#define zpci_attr(name, fmt, member) \ |
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static ssize_t name##_show(struct device *dev, \ |
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struct device_attribute *attr, char *buf) \ |
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{ \ |
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struct zpci_dev *zdev = to_zpci(to_pci_dev(dev)); \ |
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\ |
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return sprintf(buf, fmt, zdev->member); \ |
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} \ |
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static DEVICE_ATTR_RO(name) |
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zpci_attr(function_id, "0x%08x\n", fid); |
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zpci_attr(function_handle, "0x%08x\n", fh); |
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zpci_attr(pchid, "0x%04x\n", pchid); |
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zpci_attr(pfgid, "0x%02x\n", pfgid); |
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zpci_attr(vfn, "0x%04x\n", vfn); |
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zpci_attr(pft, "0x%02x\n", pft); |
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zpci_attr(port, "%d\n", port); |
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zpci_attr(uid, "0x%x\n", uid); |
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zpci_attr(segment0, "0x%02x\n", pfip[0]); |
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zpci_attr(segment1, "0x%02x\n", pfip[1]); |
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zpci_attr(segment2, "0x%02x\n", pfip[2]); |
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zpci_attr(segment3, "0x%02x\n", pfip[3]); |
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static ssize_t mio_enabled_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct zpci_dev *zdev = to_zpci(to_pci_dev(dev)); |
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return sprintf(buf, zpci_use_mio(zdev) ? "1\n" : "0\n"); |
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} |
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static DEVICE_ATTR_RO(mio_enabled); |
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static ssize_t recover_store(struct device *dev, struct device_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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struct kernfs_node *kn; |
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struct pci_dev *pdev = to_pci_dev(dev); |
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struct zpci_dev *zdev = to_zpci(pdev); |
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int ret = 0; |
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/* Can't use device_remove_self() here as that would lead us to lock |
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* the pci_rescan_remove_lock while holding the device' kernfs lock. |
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* This would create a possible deadlock with disable_slot() which is |
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* not directly protected by the device' kernfs lock but takes it |
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* during the device removal which happens under |
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* pci_rescan_remove_lock. |
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* |
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* This is analogous to sdev_store_delete() in |
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* drivers/scsi/scsi_sysfs.c |
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*/ |
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kn = sysfs_break_active_protection(&dev->kobj, &attr->attr); |
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WARN_ON_ONCE(!kn); |
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/* device_remove_file() serializes concurrent calls ignoring all but |
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* the first |
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*/ |
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device_remove_file(dev, attr); |
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/* A concurrent call to recover_store() may slip between |
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* sysfs_break_active_protection() and the sysfs file removal. |
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* Once it unblocks from pci_lock_rescan_remove() the original pdev |
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* will already be removed. |
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*/ |
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pci_lock_rescan_remove(); |
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if (pci_dev_is_added(pdev)) { |
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pci_stop_and_remove_bus_device(pdev); |
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if (zdev->dma_table) { |
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ret = zpci_dma_exit_device(zdev); |
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if (ret) |
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goto out; |
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} |
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if (zdev_enabled(zdev)) { |
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ret = zpci_disable_device(zdev); |
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if (ret) |
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goto out; |
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} |
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ret = zpci_enable_device(zdev); |
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if (ret) |
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goto out; |
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ret = zpci_dma_init_device(zdev); |
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if (ret) { |
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zpci_disable_device(zdev); |
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goto out; |
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} |
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pci_rescan_bus(zdev->zbus->bus); |
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} |
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out: |
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pci_unlock_rescan_remove(); |
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if (kn) |
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sysfs_unbreak_active_protection(kn); |
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return ret ? ret : count; |
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} |
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static DEVICE_ATTR_WO(recover); |
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static ssize_t util_string_read(struct file *filp, struct kobject *kobj, |
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struct bin_attribute *attr, char *buf, |
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loff_t off, size_t count) |
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{ |
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struct device *dev = kobj_to_dev(kobj); |
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struct pci_dev *pdev = to_pci_dev(dev); |
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struct zpci_dev *zdev = to_zpci(pdev); |
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return memory_read_from_buffer(buf, count, &off, zdev->util_str, |
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sizeof(zdev->util_str)); |
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} |
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static BIN_ATTR_RO(util_string, CLP_UTIL_STR_LEN); |
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static ssize_t report_error_write(struct file *filp, struct kobject *kobj, |
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struct bin_attribute *attr, char *buf, |
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loff_t off, size_t count) |
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{ |
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struct zpci_report_error_header *report = (void *) buf; |
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struct device *dev = kobj_to_dev(kobj); |
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struct pci_dev *pdev = to_pci_dev(dev); |
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struct zpci_dev *zdev = to_zpci(pdev); |
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int ret; |
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if (off || (count < sizeof(*report))) |
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return -EINVAL; |
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ret = sclp_pci_report(report, zdev->fh, zdev->fid); |
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return ret ? ret : count; |
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} |
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static BIN_ATTR(report_error, S_IWUSR, NULL, report_error_write, PAGE_SIZE); |
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static ssize_t uid_is_unique_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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return sysfs_emit(buf, "%d\n", zpci_unique_uid ? 1 : 0); |
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} |
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static DEVICE_ATTR_RO(uid_is_unique); |
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#ifndef CONFIG_DMI |
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/* analogous to smbios index */ |
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static ssize_t index_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct zpci_dev *zdev = to_zpci(to_pci_dev(dev)); |
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u32 index = ~0; |
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if (zpci_unique_uid) |
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index = zdev->uid; |
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return sysfs_emit(buf, "%u\n", index); |
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} |
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static DEVICE_ATTR_RO(index); |
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static umode_t zpci_index_is_visible(struct kobject *kobj, |
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struct attribute *attr, int n) |
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{ |
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return zpci_unique_uid ? attr->mode : 0; |
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} |
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static struct attribute *zpci_ident_attrs[] = { |
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&dev_attr_index.attr, |
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NULL, |
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}; |
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static struct attribute_group zpci_ident_attr_group = { |
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.attrs = zpci_ident_attrs, |
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.is_visible = zpci_index_is_visible, |
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}; |
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#endif |
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static struct bin_attribute *zpci_bin_attrs[] = { |
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&bin_attr_util_string, |
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&bin_attr_report_error, |
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NULL, |
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}; |
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static struct attribute *zpci_dev_attrs[] = { |
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&dev_attr_function_id.attr, |
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&dev_attr_function_handle.attr, |
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&dev_attr_pchid.attr, |
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&dev_attr_pfgid.attr, |
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&dev_attr_pft.attr, |
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&dev_attr_port.attr, |
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&dev_attr_vfn.attr, |
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&dev_attr_uid.attr, |
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&dev_attr_recover.attr, |
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&dev_attr_mio_enabled.attr, |
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&dev_attr_uid_is_unique.attr, |
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NULL, |
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}; |
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static struct attribute_group zpci_attr_group = { |
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.attrs = zpci_dev_attrs, |
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.bin_attrs = zpci_bin_attrs, |
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}; |
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static struct attribute *pfip_attrs[] = { |
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&dev_attr_segment0.attr, |
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&dev_attr_segment1.attr, |
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&dev_attr_segment2.attr, |
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&dev_attr_segment3.attr, |
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NULL, |
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}; |
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static struct attribute_group pfip_attr_group = { |
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.name = "pfip", |
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.attrs = pfip_attrs, |
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}; |
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const struct attribute_group *zpci_attr_groups[] = { |
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&zpci_attr_group, |
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&pfip_attr_group, |
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#ifndef CONFIG_DMI |
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&zpci_ident_attr_group, |
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#endif |
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NULL, |
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};
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