1 /* 2 * Copyright IBM Corp. 2012 3 * 4 * Author(s): 5 * Jan Glauber <jang@linux.vnet.ibm.com> 6 */ 7 8 #define COMPONENT "zPCI" 9 #define pr_fmt(fmt) COMPONENT ": " fmt 10 11 #include <linux/kernel.h> 12 #include <linux/stat.h> 13 #include <linux/pci.h> 14 15 static ssize_t show_fid(struct device *dev, struct device_attribute *attr, 16 char *buf) 17 { 18 struct zpci_dev *zdev = get_zdev(to_pci_dev(dev)); 19 20 return sprintf(buf, "0x%08x\n", zdev->fid); 21 } 22 static DEVICE_ATTR(function_id, S_IRUGO, show_fid, NULL); 23 24 static ssize_t show_fh(struct device *dev, struct device_attribute *attr, 25 char *buf) 26 { 27 struct zpci_dev *zdev = get_zdev(to_pci_dev(dev)); 28 29 return sprintf(buf, "0x%08x\n", zdev->fh); 30 } 31 static DEVICE_ATTR(function_handle, S_IRUGO, show_fh, NULL); 32 33 static ssize_t show_pchid(struct device *dev, struct device_attribute *attr, 34 char *buf) 35 { 36 struct zpci_dev *zdev = get_zdev(to_pci_dev(dev)); 37 38 return sprintf(buf, "0x%04x\n", zdev->pchid); 39 } 40 static DEVICE_ATTR(pchid, S_IRUGO, show_pchid, NULL); 41 42 static ssize_t show_pfgid(struct device *dev, struct device_attribute *attr, 43 char *buf) 44 { 45 struct zpci_dev *zdev = get_zdev(to_pci_dev(dev)); 46 47 return sprintf(buf, "0x%02x\n", zdev->pfgid); 48 } 49 static DEVICE_ATTR(pfgid, S_IRUGO, show_pfgid, NULL); 50 51 static void recover_callback(struct device *dev) 52 { 53 struct pci_dev *pdev = to_pci_dev(dev); 54 struct zpci_dev *zdev = get_zdev(pdev); 55 int ret; 56 57 pci_stop_and_remove_bus_device(pdev); 58 ret = zpci_disable_device(zdev); 59 if (ret) 60 return; 61 62 ret = zpci_enable_device(zdev); 63 if (ret) 64 return; 65 66 pci_rescan_bus(zdev->bus); 67 } 68 69 static ssize_t store_recover(struct device *dev, struct device_attribute *attr, 70 const char *buf, size_t count) 71 { 72 int rc = device_schedule_callback(dev, recover_callback); 73 return rc ? rc : count; 74 } 75 static DEVICE_ATTR(recover, S_IWUSR, NULL, store_recover); 76 77 static struct device_attribute *zpci_dev_attrs[] = { 78 &dev_attr_function_id, 79 &dev_attr_function_handle, 80 &dev_attr_pchid, 81 &dev_attr_pfgid, 82 &dev_attr_recover, 83 NULL, 84 }; 85 86 int zpci_sysfs_add_device(struct device *dev) 87 { 88 int i, rc = 0; 89 90 for (i = 0; zpci_dev_attrs[i]; i++) { 91 rc = device_create_file(dev, zpci_dev_attrs[i]); 92 if (rc) 93 goto error; 94 } 95 return 0; 96 97 error: 98 while (--i >= 0) 99 device_remove_file(dev, zpci_dev_attrs[i]); 100 return rc; 101 } 102 103 void zpci_sysfs_remove_device(struct device *dev) 104 { 105 int i; 106 107 for (i = 0; zpci_dev_attrs[i]; i++) 108 device_remove_file(dev, zpci_dev_attrs[i]); 109 } 110