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/pci.h> 14 #include <asm/pci_debug.h> 15 #include <asm/pci_dma.h> 16 #include <asm/sclp.h> 17 18 #include "pci_bus.h" 19 20 /* Content Code Description for PCI Function Error */ 21 struct zpci_ccdf_err { 22 u32 reserved1; 23 u32 fh; /* function handle */ 24 u32 fid; /* function id */ 25 u32 ett : 4; /* expected table type */ 26 u32 mvn : 12; /* MSI vector number */ 27 u32 dmaas : 8; /* DMA address space */ 28 u32 : 6; 29 u32 q : 1; /* event qualifier */ 30 u32 rw : 1; /* read/write */ 31 u64 faddr; /* failing address */ 32 u32 reserved3; 33 u16 reserved4; 34 u16 pec; /* PCI event code */ 35 } __packed; 36 37 /* Content Code Description for PCI Function Availability */ 38 struct zpci_ccdf_avail { 39 u32 reserved1; 40 u32 fh; /* function handle */ 41 u32 fid; /* function id */ 42 u32 reserved2; 43 u32 reserved3; 44 u32 reserved4; 45 u32 reserved5; 46 u16 reserved6; 47 u16 pec; /* PCI event code */ 48 } __packed; 49 50 static void __zpci_event_error(struct zpci_ccdf_err *ccdf) 51 { 52 struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid); 53 struct pci_dev *pdev = NULL; 54 55 zpci_err("error CCDF:\n"); 56 zpci_err_hex(ccdf, sizeof(*ccdf)); 57 58 if (zdev) 59 pdev = pci_get_slot(zdev->zbus->bus, zdev->devfn); 60 61 pr_err("%s: Event 0x%x reports an error for PCI function 0x%x\n", 62 pdev ? pci_name(pdev) : "n/a", ccdf->pec, ccdf->fid); 63 64 if (!pdev) 65 return; 66 67 pdev->error_state = pci_channel_io_perm_failure; 68 pci_dev_put(pdev); 69 } 70 71 void zpci_event_error(void *data) 72 { 73 if (zpci_is_enabled()) 74 __zpci_event_error(data); 75 } 76 77 static void zpci_event_hard_deconfigured(struct zpci_dev *zdev, u32 fh) 78 { 79 zdev->fh = fh; 80 /* Give the driver a hint that the function is 81 * already unusable. 82 */ 83 zpci_bus_remove_device(zdev, true); 84 /* Even though the device is already gone we still 85 * need to free zPCI resources as part of the disable. 86 */ 87 zpci_disable_device(zdev); 88 zdev->state = ZPCI_FN_STATE_STANDBY; 89 } 90 91 static void __zpci_event_availability(struct zpci_ccdf_avail *ccdf) 92 { 93 struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid); 94 enum zpci_state state; 95 96 zpci_err("avail CCDF:\n"); 97 zpci_err_hex(ccdf, sizeof(*ccdf)); 98 99 switch (ccdf->pec) { 100 case 0x0301: /* Reserved|Standby -> Configured */ 101 if (!zdev) { 102 zdev = zpci_create_device(ccdf->fid, ccdf->fh, ZPCI_FN_STATE_CONFIGURED); 103 if (IS_ERR(zdev)) 104 break; 105 } else { 106 /* the configuration request may be stale */ 107 if (zdev->state != ZPCI_FN_STATE_STANDBY) 108 break; 109 zdev->state = ZPCI_FN_STATE_CONFIGURED; 110 } 111 zpci_scan_configured_device(zdev, ccdf->fh); 112 break; 113 case 0x0302: /* Reserved -> Standby */ 114 if (!zdev) 115 zpci_create_device(ccdf->fid, ccdf->fh, ZPCI_FN_STATE_STANDBY); 116 else 117 zdev->fh = ccdf->fh; 118 break; 119 case 0x0303: /* Deconfiguration requested */ 120 if (zdev) { 121 /* The event may have been queued before we confirgured 122 * the device. 123 */ 124 if (zdev->state != ZPCI_FN_STATE_CONFIGURED) 125 break; 126 zdev->fh = ccdf->fh; 127 zpci_deconfigure_device(zdev); 128 } 129 break; 130 case 0x0304: /* Configured -> Standby|Reserved */ 131 if (zdev) { 132 /* The event may have been queued before we confirgured 133 * the device.: 134 */ 135 if (zdev->state == ZPCI_FN_STATE_CONFIGURED) 136 zpci_event_hard_deconfigured(zdev, ccdf->fh); 137 /* The 0x0304 event may immediately reserve the device */ 138 if (!clp_get_state(zdev->fid, &state) && 139 state == ZPCI_FN_STATE_RESERVED) { 140 zpci_zdev_put(zdev); 141 } 142 } 143 break; 144 case 0x0306: /* 0x308 or 0x302 for multiple devices */ 145 zpci_remove_reserved_devices(); 146 clp_scan_pci_devices(); 147 break; 148 case 0x0308: /* Standby -> Reserved */ 149 if (!zdev) 150 break; 151 zpci_zdev_put(zdev); 152 break; 153 default: 154 break; 155 } 156 } 157 158 void zpci_event_availability(void *data) 159 { 160 if (zpci_is_enabled()) 161 __zpci_event_availability(data); 162 } 163