1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright IBM Corp. 2012 4 * 5 * Author(s): 6 * Jan Glauber <jang@linux.vnet.ibm.com> 7 */ 8 9 #define KMSG_COMPONENT "zpci" 10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 11 12 #include <linux/kernel.h> 13 #include <linux/stat.h> 14 #include <linux/pci.h> 15 16 #include "../../../drivers/pci/pci.h" 17 18 #include <asm/sclp.h> 19 20 #define zpci_attr(name, fmt, member) \ 21 static ssize_t name##_show(struct device *dev, \ 22 struct device_attribute *attr, char *buf) \ 23 { \ 24 struct zpci_dev *zdev = to_zpci(to_pci_dev(dev)); \ 25 \ 26 return sprintf(buf, fmt, zdev->member); \ 27 } \ 28 static DEVICE_ATTR_RO(name) 29 30 zpci_attr(function_id, "0x%08x\n", fid); 31 zpci_attr(function_handle, "0x%08x\n", fh); 32 zpci_attr(pchid, "0x%04x\n", pchid); 33 zpci_attr(pfgid, "0x%02x\n", pfgid); 34 zpci_attr(vfn, "0x%04x\n", vfn); 35 zpci_attr(pft, "0x%02x\n", pft); 36 zpci_attr(port, "%d\n", port); 37 zpci_attr(uid, "0x%x\n", uid); 38 zpci_attr(segment0, "0x%02x\n", pfip[0]); 39 zpci_attr(segment1, "0x%02x\n", pfip[1]); 40 zpci_attr(segment2, "0x%02x\n", pfip[2]); 41 zpci_attr(segment3, "0x%02x\n", pfip[3]); 42 43 static ssize_t mio_enabled_show(struct device *dev, 44 struct device_attribute *attr, char *buf) 45 { 46 struct zpci_dev *zdev = to_zpci(to_pci_dev(dev)); 47 48 return sprintf(buf, zpci_use_mio(zdev) ? "1\n" : "0\n"); 49 } 50 static DEVICE_ATTR_RO(mio_enabled); 51 52 static ssize_t recover_store(struct device *dev, struct device_attribute *attr, 53 const char *buf, size_t count) 54 { 55 struct kernfs_node *kn; 56 struct pci_dev *pdev = to_pci_dev(dev); 57 struct zpci_dev *zdev = to_zpci(pdev); 58 int ret = 0; 59 60 /* Can't use device_remove_self() here as that would lead us to lock 61 * the pci_rescan_remove_lock while holding the device' kernfs lock. 62 * This would create a possible deadlock with disable_slot() which is 63 * not directly protected by the device' kernfs lock but takes it 64 * during the device removal which happens under 65 * pci_rescan_remove_lock. 66 * 67 * This is analogous to sdev_store_delete() in 68 * drivers/scsi/scsi_sysfs.c 69 */ 70 kn = sysfs_break_active_protection(&dev->kobj, &attr->attr); 71 WARN_ON_ONCE(!kn); 72 /* device_remove_file() serializes concurrent calls ignoring all but 73 * the first 74 */ 75 device_remove_file(dev, attr); 76 77 /* A concurrent call to recover_store() may slip between 78 * sysfs_break_active_protection() and the sysfs file removal. 79 * Once it unblocks from pci_lock_rescan_remove() the original pdev 80 * will already be removed. 81 */ 82 pci_lock_rescan_remove(); 83 if (pci_dev_is_added(pdev)) { 84 pci_stop_and_remove_bus_device(pdev); 85 if (zdev->dma_table) { 86 ret = zpci_dma_exit_device(zdev); 87 if (ret) 88 goto out; 89 } 90 91 if (zdev_enabled(zdev)) { 92 ret = zpci_disable_device(zdev); 93 /* 94 * Due to a z/VM vs LPAR inconsistency in the error 95 * state the FH may indicate an enabled device but 96 * disable says the device is already disabled don't 97 * treat it as an error here. 98 */ 99 if (ret == -EINVAL) 100 ret = 0; 101 if (ret) 102 goto out; 103 } 104 105 ret = zpci_enable_device(zdev); 106 if (ret) 107 goto out; 108 ret = zpci_dma_init_device(zdev); 109 if (ret) { 110 zpci_disable_device(zdev); 111 goto out; 112 } 113 pci_rescan_bus(zdev->zbus->bus); 114 } 115 out: 116 pci_unlock_rescan_remove(); 117 if (kn) 118 sysfs_unbreak_active_protection(kn); 119 return ret ? ret : count; 120 } 121 static DEVICE_ATTR_WO(recover); 122 123 static ssize_t util_string_read(struct file *filp, struct kobject *kobj, 124 struct bin_attribute *attr, char *buf, 125 loff_t off, size_t count) 126 { 127 struct device *dev = kobj_to_dev(kobj); 128 struct pci_dev *pdev = to_pci_dev(dev); 129 struct zpci_dev *zdev = to_zpci(pdev); 130 131 return memory_read_from_buffer(buf, count, &off, zdev->util_str, 132 sizeof(zdev->util_str)); 133 } 134 static BIN_ATTR_RO(util_string, CLP_UTIL_STR_LEN); 135 136 static ssize_t report_error_write(struct file *filp, struct kobject *kobj, 137 struct bin_attribute *attr, char *buf, 138 loff_t off, size_t count) 139 { 140 struct zpci_report_error_header *report = (void *) buf; 141 struct device *dev = kobj_to_dev(kobj); 142 struct pci_dev *pdev = to_pci_dev(dev); 143 struct zpci_dev *zdev = to_zpci(pdev); 144 int ret; 145 146 if (off || (count < sizeof(*report))) 147 return -EINVAL; 148 149 ret = sclp_pci_report(report, zdev->fh, zdev->fid); 150 151 return ret ? ret : count; 152 } 153 static BIN_ATTR(report_error, S_IWUSR, NULL, report_error_write, PAGE_SIZE); 154 155 static ssize_t uid_is_unique_show(struct device *dev, 156 struct device_attribute *attr, char *buf) 157 { 158 return sysfs_emit(buf, "%d\n", zpci_unique_uid ? 1 : 0); 159 } 160 static DEVICE_ATTR_RO(uid_is_unique); 161 162 #ifndef CONFIG_DMI 163 /* analogous to smbios index */ 164 static ssize_t index_show(struct device *dev, 165 struct device_attribute *attr, char *buf) 166 { 167 struct zpci_dev *zdev = to_zpci(to_pci_dev(dev)); 168 u32 index = ~0; 169 170 if (zpci_unique_uid) 171 index = zdev->uid; 172 173 return sysfs_emit(buf, "%u\n", index); 174 } 175 static DEVICE_ATTR_RO(index); 176 177 static umode_t zpci_index_is_visible(struct kobject *kobj, 178 struct attribute *attr, int n) 179 { 180 return zpci_unique_uid ? attr->mode : 0; 181 } 182 183 static struct attribute *zpci_ident_attrs[] = { 184 &dev_attr_index.attr, 185 NULL, 186 }; 187 188 static struct attribute_group zpci_ident_attr_group = { 189 .attrs = zpci_ident_attrs, 190 .is_visible = zpci_index_is_visible, 191 }; 192 #endif 193 194 static struct bin_attribute *zpci_bin_attrs[] = { 195 &bin_attr_util_string, 196 &bin_attr_report_error, 197 NULL, 198 }; 199 200 static struct attribute *zpci_dev_attrs[] = { 201 &dev_attr_function_id.attr, 202 &dev_attr_function_handle.attr, 203 &dev_attr_pchid.attr, 204 &dev_attr_pfgid.attr, 205 &dev_attr_pft.attr, 206 &dev_attr_port.attr, 207 &dev_attr_vfn.attr, 208 &dev_attr_uid.attr, 209 &dev_attr_recover.attr, 210 &dev_attr_mio_enabled.attr, 211 &dev_attr_uid_is_unique.attr, 212 NULL, 213 }; 214 215 static struct attribute_group zpci_attr_group = { 216 .attrs = zpci_dev_attrs, 217 .bin_attrs = zpci_bin_attrs, 218 }; 219 220 static struct attribute *pfip_attrs[] = { 221 &dev_attr_segment0.attr, 222 &dev_attr_segment1.attr, 223 &dev_attr_segment2.attr, 224 &dev_attr_segment3.attr, 225 NULL, 226 }; 227 static struct attribute_group pfip_attr_group = { 228 .name = "pfip", 229 .attrs = pfip_attrs, 230 }; 231 232 const struct attribute_group *zpci_attr_groups[] = { 233 &zpci_attr_group, 234 &pfip_attr_group, 235 #ifndef CONFIG_DMI 236 &zpci_ident_attr_group, 237 #endif 238 NULL, 239 }; 240