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 u8 status; 60 61 /* Can't use device_remove_self() here as that would lead us to lock 62 * the pci_rescan_remove_lock while holding the device' kernfs lock. 63 * This would create a possible deadlock with disable_slot() which is 64 * not directly protected by the device' kernfs lock but takes it 65 * during the device removal which happens under 66 * pci_rescan_remove_lock. 67 * 68 * This is analogous to sdev_store_delete() in 69 * drivers/scsi/scsi_sysfs.c 70 */ 71 kn = sysfs_break_active_protection(&dev->kobj, &attr->attr); 72 WARN_ON_ONCE(!kn); 73 /* device_remove_file() serializes concurrent calls ignoring all but 74 * the first 75 */ 76 device_remove_file(dev, attr); 77 78 /* A concurrent call to recover_store() may slip between 79 * sysfs_break_active_protection() and the sysfs file removal. 80 * Once it unblocks from pci_lock_rescan_remove() the original pdev 81 * will already be removed. 82 */ 83 pci_lock_rescan_remove(); 84 if (pci_dev_is_added(pdev)) { 85 pci_stop_and_remove_bus_device(pdev); 86 if (zdev_enabled(zdev)) { 87 ret = zpci_disable_device(zdev); 88 /* 89 * Due to a z/VM vs LPAR inconsistency in the error 90 * state the FH may indicate an enabled device but 91 * disable says the device is already disabled don't 92 * treat it as an error here. 93 */ 94 if (ret == -EINVAL) 95 ret = 0; 96 if (ret) 97 goto out; 98 } 99 100 ret = zpci_enable_device(zdev); 101 if (ret) 102 goto out; 103 104 if (zdev->dma_table) { 105 ret = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma, 106 virt_to_phys(zdev->dma_table), &status); 107 if (ret) 108 zpci_disable_device(zdev); 109 } 110 } 111 out: 112 pci_rescan_bus(zdev->zbus->bus); 113 pci_unlock_rescan_remove(); 114 if (kn) 115 sysfs_unbreak_active_protection(kn); 116 return ret ? ret : count; 117 } 118 static DEVICE_ATTR_WO(recover); 119 120 static ssize_t util_string_read(struct file *filp, struct kobject *kobj, 121 struct bin_attribute *attr, char *buf, 122 loff_t off, size_t count) 123 { 124 struct device *dev = kobj_to_dev(kobj); 125 struct pci_dev *pdev = to_pci_dev(dev); 126 struct zpci_dev *zdev = to_zpci(pdev); 127 128 return memory_read_from_buffer(buf, count, &off, zdev->util_str, 129 sizeof(zdev->util_str)); 130 } 131 static BIN_ATTR_RO(util_string, CLP_UTIL_STR_LEN); 132 133 static ssize_t report_error_write(struct file *filp, struct kobject *kobj, 134 struct bin_attribute *attr, char *buf, 135 loff_t off, size_t count) 136 { 137 struct zpci_report_error_header *report = (void *) buf; 138 struct device *dev = kobj_to_dev(kobj); 139 struct pci_dev *pdev = to_pci_dev(dev); 140 struct zpci_dev *zdev = to_zpci(pdev); 141 int ret; 142 143 if (off || (count < sizeof(*report))) 144 return -EINVAL; 145 146 ret = sclp_pci_report(report, zdev->fh, zdev->fid); 147 148 return ret ? ret : count; 149 } 150 static BIN_ATTR(report_error, S_IWUSR, NULL, report_error_write, PAGE_SIZE); 151 152 static ssize_t uid_is_unique_show(struct device *dev, 153 struct device_attribute *attr, char *buf) 154 { 155 return sysfs_emit(buf, "%d\n", zpci_unique_uid ? 1 : 0); 156 } 157 static DEVICE_ATTR_RO(uid_is_unique); 158 159 #ifndef CONFIG_DMI 160 /* analogous to smbios index */ 161 static ssize_t index_show(struct device *dev, 162 struct device_attribute *attr, char *buf) 163 { 164 struct zpci_dev *zdev = to_zpci(to_pci_dev(dev)); 165 u32 index = ~0; 166 167 if (zpci_unique_uid) 168 index = zdev->uid; 169 170 return sysfs_emit(buf, "%u\n", index); 171 } 172 static DEVICE_ATTR_RO(index); 173 174 static umode_t zpci_index_is_visible(struct kobject *kobj, 175 struct attribute *attr, int n) 176 { 177 return zpci_unique_uid ? attr->mode : 0; 178 } 179 180 static struct attribute *zpci_ident_attrs[] = { 181 &dev_attr_index.attr, 182 NULL, 183 }; 184 185 static struct attribute_group zpci_ident_attr_group = { 186 .attrs = zpci_ident_attrs, 187 .is_visible = zpci_index_is_visible, 188 }; 189 #endif 190 191 static struct bin_attribute *zpci_bin_attrs[] = { 192 &bin_attr_util_string, 193 &bin_attr_report_error, 194 NULL, 195 }; 196 197 static struct attribute *zpci_dev_attrs[] = { 198 &dev_attr_function_id.attr, 199 &dev_attr_function_handle.attr, 200 &dev_attr_pchid.attr, 201 &dev_attr_pfgid.attr, 202 &dev_attr_pft.attr, 203 &dev_attr_port.attr, 204 &dev_attr_vfn.attr, 205 &dev_attr_uid.attr, 206 &dev_attr_recover.attr, 207 &dev_attr_mio_enabled.attr, 208 &dev_attr_uid_is_unique.attr, 209 NULL, 210 }; 211 212 static struct attribute_group zpci_attr_group = { 213 .attrs = zpci_dev_attrs, 214 .bin_attrs = zpci_bin_attrs, 215 }; 216 217 static struct attribute *pfip_attrs[] = { 218 &dev_attr_segment0.attr, 219 &dev_attr_segment1.attr, 220 &dev_attr_segment2.attr, 221 &dev_attr_segment3.attr, 222 NULL, 223 }; 224 static struct attribute_group pfip_attr_group = { 225 .name = "pfip", 226 .attrs = pfip_attrs, 227 }; 228 229 const struct attribute_group *zpci_attr_groups[] = { 230 &zpci_attr_group, 231 &pfip_attr_group, 232 #ifndef CONFIG_DMI 233 &zpci_ident_attr_group, 234 #endif 235 NULL, 236 }; 237