1 /* 2 * Copyright IBM Corp. 2012 3 * 4 * Author(s): 5 * Jan Glauber <jang@linux.vnet.ibm.com> 6 */ 7 8 #define KMSG_COMPONENT "zpci" 9 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 10 11 #include <linux/kernel.h> 12 #include <linux/pci.h> 13 #include <asm/pci_debug.h> 14 #include <asm/sclp.h> 15 16 /* Content Code Description for PCI Function Error */ 17 struct zpci_ccdf_err { 18 u32 reserved1; 19 u32 fh; /* function handle */ 20 u32 fid; /* function id */ 21 u32 ett : 4; /* expected table type */ 22 u32 mvn : 12; /* MSI vector number */ 23 u32 dmaas : 8; /* DMA address space */ 24 u32 : 6; 25 u32 q : 1; /* event qualifier */ 26 u32 rw : 1; /* read/write */ 27 u64 faddr; /* failing address */ 28 u32 reserved3; 29 u16 reserved4; 30 u16 pec; /* PCI event code */ 31 } __packed; 32 33 /* Content Code Description for PCI Function Availability */ 34 struct zpci_ccdf_avail { 35 u32 reserved1; 36 u32 fh; /* function handle */ 37 u32 fid; /* function id */ 38 u32 reserved2; 39 u32 reserved3; 40 u32 reserved4; 41 u32 reserved5; 42 u16 reserved6; 43 u16 pec; /* PCI event code */ 44 } __packed; 45 46 static void __zpci_event_error(struct zpci_ccdf_err *ccdf) 47 { 48 struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid); 49 struct pci_dev *pdev = NULL; 50 51 zpci_err("error CCDF:\n"); 52 zpci_err_hex(ccdf, sizeof(*ccdf)); 53 54 if (zdev) 55 pdev = pci_get_slot(zdev->bus, ZPCI_DEVFN); 56 57 pr_err("%s: Event 0x%x reports an error for PCI function 0x%x\n", 58 pdev ? pci_name(pdev) : "n/a", ccdf->pec, ccdf->fid); 59 60 if (!pdev) 61 return; 62 63 pdev->error_state = pci_channel_io_perm_failure; 64 pci_dev_put(pdev); 65 } 66 67 void zpci_event_error(void *data) 68 { 69 if (zpci_is_enabled()) 70 __zpci_event_error(data); 71 } 72 73 static void __zpci_event_availability(struct zpci_ccdf_avail *ccdf) 74 { 75 struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid); 76 struct pci_dev *pdev = NULL; 77 int ret; 78 79 if (zdev) 80 pdev = pci_get_slot(zdev->bus, ZPCI_DEVFN); 81 82 pr_info("%s: Event 0x%x reconfigured PCI function 0x%x\n", 83 pdev ? pci_name(pdev) : "n/a", ccdf->pec, ccdf->fid); 84 zpci_err("avail CCDF:\n"); 85 zpci_err_hex(ccdf, sizeof(*ccdf)); 86 87 switch (ccdf->pec) { 88 case 0x0301: /* Reserved|Standby -> Configured */ 89 if (!zdev) { 90 ret = clp_add_pci_device(ccdf->fid, ccdf->fh, 0); 91 if (ret) 92 break; 93 zdev = get_zdev_by_fid(ccdf->fid); 94 } 95 if (!zdev || zdev->state != ZPCI_FN_STATE_STANDBY) 96 break; 97 zdev->state = ZPCI_FN_STATE_CONFIGURED; 98 zdev->fh = ccdf->fh; 99 ret = zpci_enable_device(zdev); 100 if (ret) 101 break; 102 pci_lock_rescan_remove(); 103 pci_rescan_bus(zdev->bus); 104 pci_unlock_rescan_remove(); 105 break; 106 case 0x0302: /* Reserved -> Standby */ 107 if (!zdev) 108 clp_add_pci_device(ccdf->fid, ccdf->fh, 0); 109 break; 110 case 0x0303: /* Deconfiguration requested */ 111 if (pdev) 112 pci_stop_and_remove_bus_device_locked(pdev); 113 114 ret = zpci_disable_device(zdev); 115 if (ret) 116 break; 117 118 ret = sclp_pci_deconfigure(zdev->fid); 119 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret); 120 if (!ret) 121 zdev->state = ZPCI_FN_STATE_STANDBY; 122 123 break; 124 case 0x0304: /* Configured -> Standby */ 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->fh = ccdf->fh; 133 zpci_disable_device(zdev); 134 zdev->state = ZPCI_FN_STATE_STANDBY; 135 break; 136 case 0x0306: /* 0x308 or 0x302 for multiple devices */ 137 clp_rescan_pci_devices(); 138 break; 139 case 0x0308: /* Standby -> Reserved */ 140 if (!zdev) 141 break; 142 pci_stop_root_bus(zdev->bus); 143 pci_remove_root_bus(zdev->bus); 144 break; 145 default: 146 break; 147 } 148 if (pdev) 149 pci_dev_put(pdev); 150 } 151 152 void zpci_event_availability(void *data) 153 { 154 if (zpci_is_enabled()) 155 __zpci_event_availability(data); 156 } 157