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 enum zpci_state state; 80 81 zdev->fh = fh; 82 /* Give the driver a hint that the function is 83 * already unusable. 84 */ 85 zpci_bus_remove_device(zdev, true); 86 /* Even though the device is already gone we still 87 * need to free zPCI resources as part of the disable. 88 */ 89 zpci_disable_device(zdev); 90 zdev->state = ZPCI_FN_STATE_STANDBY; 91 if (!clp_get_state(zdev->fid, &state) && 92 state == ZPCI_FN_STATE_RESERVED) { 93 zpci_zdev_put(zdev); 94 } 95 } 96 97 static void __zpci_event_availability(struct zpci_ccdf_avail *ccdf) 98 { 99 struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid); 100 101 zpci_err("avail CCDF:\n"); 102 zpci_err_hex(ccdf, sizeof(*ccdf)); 103 104 switch (ccdf->pec) { 105 case 0x0301: /* Reserved|Standby -> Configured */ 106 if (!zdev) { 107 zdev = zpci_create_device(ccdf->fid, ccdf->fh, ZPCI_FN_STATE_CONFIGURED); 108 if (IS_ERR(zdev)) 109 break; 110 } else { 111 /* the configuration request may be stale */ 112 if (zdev->state != ZPCI_FN_STATE_STANDBY) 113 break; 114 zdev->state = ZPCI_FN_STATE_CONFIGURED; 115 } 116 zpci_configure_device(zdev, ccdf->fh); 117 break; 118 case 0x0302: /* Reserved -> Standby */ 119 if (!zdev) 120 zpci_create_device(ccdf->fid, ccdf->fh, ZPCI_FN_STATE_STANDBY); 121 else 122 zdev->fh = ccdf->fh; 123 break; 124 case 0x0303: /* Deconfiguration requested */ 125 if (zdev) { 126 zdev->fh = ccdf->fh; 127 zpci_deconfigure_device(zdev); 128 } 129 break; 130 case 0x0304: /* Configured -> Standby|Reserved */ 131 if (zdev) 132 zpci_event_hard_deconfigured(zdev, ccdf->fh); 133 break; 134 case 0x0306: /* 0x308 or 0x302 for multiple devices */ 135 zpci_remove_reserved_devices(); 136 clp_scan_pci_devices(); 137 break; 138 case 0x0308: /* Standby -> Reserved */ 139 if (!zdev) 140 break; 141 zpci_zdev_put(zdev); 142 break; 143 default: 144 break; 145 } 146 } 147 148 void zpci_event_availability(void *data) 149 { 150 if (zpci_is_enabled()) 151 __zpci_event_availability(data); 152 } 153