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 if (zdev->dma_table) 88 zpci_dma_exit_device(zdev); 89 if (zdev_enabled(zdev)) 90 zpci_disable_device(zdev); 91 zdev->state = ZPCI_FN_STATE_STANDBY; 92 } 93 94 static void __zpci_event_availability(struct zpci_ccdf_avail *ccdf) 95 { 96 struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid); 97 enum zpci_state state; 98 99 zpci_err("avail CCDF:\n"); 100 zpci_err_hex(ccdf, sizeof(*ccdf)); 101 102 switch (ccdf->pec) { 103 case 0x0301: /* Reserved|Standby -> Configured */ 104 if (!zdev) { 105 zdev = zpci_create_device(ccdf->fid, ccdf->fh, ZPCI_FN_STATE_CONFIGURED); 106 if (IS_ERR(zdev)) 107 break; 108 } else { 109 /* the configuration request may be stale */ 110 if (zdev->state != ZPCI_FN_STATE_STANDBY) 111 break; 112 zdev->state = ZPCI_FN_STATE_CONFIGURED; 113 } 114 zpci_scan_configured_device(zdev, ccdf->fh); 115 break; 116 case 0x0302: /* Reserved -> Standby */ 117 if (!zdev) 118 zpci_create_device(ccdf->fid, ccdf->fh, ZPCI_FN_STATE_STANDBY); 119 else 120 zdev->fh = ccdf->fh; 121 break; 122 case 0x0303: /* Deconfiguration requested */ 123 if (zdev) { 124 /* The event may have been queued before we confirgured 125 * the device. 126 */ 127 if (zdev->state != ZPCI_FN_STATE_CONFIGURED) 128 break; 129 zdev->fh = ccdf->fh; 130 zpci_deconfigure_device(zdev); 131 } 132 break; 133 case 0x0304: /* Configured -> Standby|Reserved */ 134 if (zdev) { 135 /* The event may have been queued before we confirgured 136 * the device.: 137 */ 138 if (zdev->state == ZPCI_FN_STATE_CONFIGURED) 139 zpci_event_hard_deconfigured(zdev, ccdf->fh); 140 /* The 0x0304 event may immediately reserve the device */ 141 if (!clp_get_state(zdev->fid, &state) && 142 state == ZPCI_FN_STATE_RESERVED) { 143 zpci_zdev_put(zdev); 144 } 145 } 146 break; 147 case 0x0306: /* 0x308 or 0x302 for multiple devices */ 148 zpci_remove_reserved_devices(); 149 clp_scan_pci_devices(); 150 break; 151 case 0x0308: /* Standby -> Reserved */ 152 if (!zdev) 153 break; 154 zpci_zdev_put(zdev); 155 break; 156 default: 157 break; 158 } 159 } 160 161 void zpci_event_availability(void *data) 162 { 163 if (zpci_is_enabled()) 164 __zpci_event_availability(data); 165 } 166