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/sclp.h> 16 17 #include "pci_bus.h" 18 19 /* Content Code Description for PCI Function Error */ 20 struct zpci_ccdf_err { 21 u32 reserved1; 22 u32 fh; /* function handle */ 23 u32 fid; /* function id */ 24 u32 ett : 4; /* expected table type */ 25 u32 mvn : 12; /* MSI vector number */ 26 u32 dmaas : 8; /* DMA address space */ 27 u32 : 6; 28 u32 q : 1; /* event qualifier */ 29 u32 rw : 1; /* read/write */ 30 u64 faddr; /* failing address */ 31 u32 reserved3; 32 u16 reserved4; 33 u16 pec; /* PCI event code */ 34 } __packed; 35 36 /* Content Code Description for PCI Function Availability */ 37 struct zpci_ccdf_avail { 38 u32 reserved1; 39 u32 fh; /* function handle */ 40 u32 fid; /* function id */ 41 u32 reserved2; 42 u32 reserved3; 43 u32 reserved4; 44 u32 reserved5; 45 u16 reserved6; 46 u16 pec; /* PCI event code */ 47 } __packed; 48 49 static void __zpci_event_error(struct zpci_ccdf_err *ccdf) 50 { 51 struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid); 52 struct pci_dev *pdev = NULL; 53 54 zpci_err("error CCDF:\n"); 55 zpci_err_hex(ccdf, sizeof(*ccdf)); 56 57 if (zdev) 58 pdev = pci_get_slot(zdev->zbus->bus, zdev->devfn); 59 60 pr_err("%s: Event 0x%x reports an error for PCI function 0x%x\n", 61 pdev ? pci_name(pdev) : "n/a", ccdf->pec, ccdf->fid); 62 63 if (!pdev) 64 return; 65 66 pdev->error_state = pci_channel_io_perm_failure; 67 pci_dev_put(pdev); 68 } 69 70 void zpci_event_error(void *data) 71 { 72 if (zpci_is_enabled()) 73 __zpci_event_error(data); 74 } 75 76 static void __zpci_event_availability(struct zpci_ccdf_avail *ccdf) 77 { 78 struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid); 79 struct pci_dev *pdev = NULL; 80 enum zpci_state state; 81 int ret; 82 83 if (zdev && zdev->zbus && zdev->zbus->bus) 84 pdev = pci_get_slot(zdev->zbus->bus, zdev->devfn); 85 86 zpci_err("avail CCDF:\n"); 87 zpci_err_hex(ccdf, sizeof(*ccdf)); 88 89 switch (ccdf->pec) { 90 case 0x0301: /* Reserved|Standby -> Configured */ 91 if (!zdev) { 92 ret = clp_add_pci_device(ccdf->fid, ccdf->fh, 1); 93 break; 94 } 95 zdev->fh = ccdf->fh; 96 zdev->state = ZPCI_FN_STATE_CONFIGURED; 97 zpci_create_device(zdev); 98 break; 99 case 0x0302: /* Reserved -> Standby */ 100 if (!zdev) { 101 clp_add_pci_device(ccdf->fid, ccdf->fh, 0); 102 break; 103 } 104 zdev->fh = ccdf->fh; 105 break; 106 case 0x0303: /* Deconfiguration requested */ 107 if (!zdev) 108 break; 109 if (pdev) 110 pci_stop_and_remove_bus_device_locked(pdev); 111 112 ret = zpci_disable_device(zdev); 113 if (ret) 114 break; 115 116 ret = sclp_pci_deconfigure(zdev->fid); 117 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret); 118 if (!ret) 119 zdev->state = ZPCI_FN_STATE_STANDBY; 120 121 break; 122 case 0x0304: /* Configured -> Standby|Reserved */ 123 if (!zdev) 124 break; 125 if (pdev) { 126 /* Give the driver a hint that the function is 127 * already unusable. */ 128 pdev->error_state = pci_channel_io_perm_failure; 129 pci_stop_and_remove_bus_device_locked(pdev); 130 } 131 132 zdev->state = ZPCI_FN_STATE_STANDBY; 133 if (!clp_get_state(ccdf->fid, &state) && 134 state == ZPCI_FN_STATE_RESERVED) { 135 zpci_zdev_put(zdev); 136 } 137 break; 138 case 0x0306: /* 0x308 or 0x302 for multiple devices */ 139 clp_rescan_pci_devices(); 140 break; 141 case 0x0308: /* Standby -> Reserved */ 142 if (!zdev) 143 break; 144 zpci_zdev_put(zdev); 145 break; 146 default: 147 break; 148 } 149 } 150 151 void zpci_event_availability(void *data) 152 { 153 if (zpci_is_enabled()) 154 __zpci_event_availability(data); 155 } 156