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 = zdev ? zdev->pdev : NULL; 50 51 zpci_err("error CCDF:\n"); 52 zpci_err_hex(ccdf, sizeof(*ccdf)); 53 54 pr_err("%s: Event 0x%x reports an error for PCI function 0x%x\n", 55 pdev ? pci_name(pdev) : "n/a", ccdf->pec, ccdf->fid); 56 } 57 58 void zpci_event_error(void *data) 59 { 60 if (zpci_is_enabled()) 61 __zpci_event_error(data); 62 } 63 64 static void __zpci_event_availability(struct zpci_ccdf_avail *ccdf) 65 { 66 struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid); 67 struct pci_dev *pdev = zdev ? zdev->pdev : NULL; 68 int ret; 69 70 pr_info("%s: Event 0x%x reconfigured PCI function 0x%x\n", 71 pdev ? pci_name(pdev) : "n/a", ccdf->pec, ccdf->fid); 72 zpci_err("avail CCDF:\n"); 73 zpci_err_hex(ccdf, sizeof(*ccdf)); 74 75 switch (ccdf->pec) { 76 case 0x0301: /* Reserved|Standby -> Configured */ 77 if (!zdev) { 78 ret = clp_add_pci_device(ccdf->fid, ccdf->fh, 0); 79 if (ret) 80 break; 81 zdev = get_zdev_by_fid(ccdf->fid); 82 } 83 if (!zdev || zdev->state != ZPCI_FN_STATE_STANDBY) 84 break; 85 zdev->state = ZPCI_FN_STATE_CONFIGURED; 86 zdev->fh = ccdf->fh; 87 ret = zpci_enable_device(zdev); 88 if (ret) 89 break; 90 pci_lock_rescan_remove(); 91 pci_rescan_bus(zdev->bus); 92 pci_unlock_rescan_remove(); 93 break; 94 case 0x0302: /* Reserved -> Standby */ 95 if (!zdev) 96 clp_add_pci_device(ccdf->fid, ccdf->fh, 0); 97 break; 98 case 0x0303: /* Deconfiguration requested */ 99 if (pdev) 100 pci_stop_and_remove_bus_device_locked(pdev); 101 102 ret = zpci_disable_device(zdev); 103 if (ret) 104 break; 105 106 ret = sclp_pci_deconfigure(zdev->fid); 107 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret); 108 if (!ret) 109 zdev->state = ZPCI_FN_STATE_STANDBY; 110 111 break; 112 case 0x0304: /* Configured -> Standby */ 113 if (pdev) { 114 /* Give the driver a hint that the function is 115 * already unusable. */ 116 pdev->error_state = pci_channel_io_perm_failure; 117 pci_stop_and_remove_bus_device_locked(pdev); 118 } 119 120 zdev->fh = ccdf->fh; 121 zpci_disable_device(zdev); 122 zdev->state = ZPCI_FN_STATE_STANDBY; 123 break; 124 case 0x0306: /* 0x308 or 0x302 for multiple devices */ 125 clp_rescan_pci_devices(); 126 break; 127 case 0x0308: /* Standby -> Reserved */ 128 if (!zdev) 129 break; 130 pci_stop_root_bus(zdev->bus); 131 pci_remove_root_bus(zdev->bus); 132 break; 133 default: 134 break; 135 } 136 } 137 138 void zpci_event_availability(void *data) 139 { 140 if (zpci_is_enabled()) 141 __zpci_event_availability(data); 142 } 143