mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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0ff70ec88b
Add an arch specific attribute to recover a pci function from an error state or config space blockage. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
110 lines
2.4 KiB
C
110 lines
2.4 KiB
C
/*
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* Copyright IBM Corp. 2012
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*
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* Author(s):
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* Jan Glauber <jang@linux.vnet.ibm.com>
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*/
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#define COMPONENT "zPCI"
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#define pr_fmt(fmt) 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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static ssize_t show_fid(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct zpci_dev *zdev = get_zdev(to_pci_dev(dev));
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return sprintf(buf, "0x%08x\n", zdev->fid);
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}
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static DEVICE_ATTR(function_id, S_IRUGO, show_fid, NULL);
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static ssize_t show_fh(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct zpci_dev *zdev = get_zdev(to_pci_dev(dev));
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return sprintf(buf, "0x%08x\n", zdev->fh);
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}
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static DEVICE_ATTR(function_handle, S_IRUGO, show_fh, NULL);
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static ssize_t show_pchid(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct zpci_dev *zdev = get_zdev(to_pci_dev(dev));
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return sprintf(buf, "0x%04x\n", zdev->pchid);
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}
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static DEVICE_ATTR(pchid, S_IRUGO, show_pchid, NULL);
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static ssize_t show_pfgid(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct zpci_dev *zdev = get_zdev(to_pci_dev(dev));
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return sprintf(buf, "0x%02x\n", zdev->pfgid);
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}
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static DEVICE_ATTR(pfgid, S_IRUGO, show_pfgid, NULL);
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static void recover_callback(struct device *dev)
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{
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struct pci_dev *pdev = to_pci_dev(dev);
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struct zpci_dev *zdev = get_zdev(pdev);
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int ret;
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pci_stop_and_remove_bus_device(pdev);
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ret = zpci_disable_device(zdev);
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if (ret)
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return;
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ret = zpci_enable_device(zdev);
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if (ret)
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return;
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pci_rescan_bus(zdev->bus);
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}
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static ssize_t store_recover(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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int rc = device_schedule_callback(dev, recover_callback);
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return rc ? rc : count;
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}
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static DEVICE_ATTR(recover, S_IWUSR, NULL, store_recover);
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static struct device_attribute *zpci_dev_attrs[] = {
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&dev_attr_function_id,
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&dev_attr_function_handle,
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&dev_attr_pchid,
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&dev_attr_pfgid,
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&dev_attr_recover,
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NULL,
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};
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int zpci_sysfs_add_device(struct device *dev)
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{
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int i, rc = 0;
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for (i = 0; zpci_dev_attrs[i]; i++) {
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rc = device_create_file(dev, zpci_dev_attrs[i]);
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if (rc)
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goto error;
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}
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return 0;
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error:
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while (--i >= 0)
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device_remove_file(dev, zpci_dev_attrs[i]);
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return rc;
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}
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void zpci_sysfs_remove_device(struct device *dev)
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{
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int i;
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for (i = 0; zpci_dev_attrs[i]; i++)
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device_remove_file(dev, zpci_dev_attrs[i]);
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}
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