1 /* 2 * Copyright IBM Corp. 2012 3 * 4 * Author(s): 5 * Jan Glauber <jang@linux.vnet.ibm.com> 6 */ 7 8 #define COMPONENT "zPCI" 9 #define pr_fmt(fmt) 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 void zpci_event_error(void *data) 47 { 48 struct zpci_ccdf_err *ccdf = data; 49 struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid); 50 51 zpci_err("error CCDF:\n"); 52 zpci_err_hex(ccdf, sizeof(*ccdf)); 53 54 if (!zdev) 55 return; 56 57 pr_err("%s: Event 0x%x reports an error for PCI function 0x%x\n", 58 pci_name(zdev->pdev), ccdf->pec, ccdf->fid); 59 } 60 61 void zpci_event_availability(void *data) 62 { 63 struct zpci_ccdf_avail *ccdf = data; 64 struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid); 65 struct pci_dev *pdev = zdev ? zdev->pdev : NULL; 66 int ret; 67 68 pr_info("%s: Event 0x%x reconfigured PCI function 0x%x\n", 69 pdev ? pci_name(pdev) : "n/a", ccdf->pec, ccdf->fid); 70 zpci_err("avail CCDF:\n"); 71 zpci_err_hex(ccdf, sizeof(*ccdf)); 72 73 switch (ccdf->pec) { 74 case 0x0301: /* Standby -> Configured */ 75 if (!zdev || zdev->state == ZPCI_FN_STATE_CONFIGURED) 76 break; 77 zdev->state = ZPCI_FN_STATE_CONFIGURED; 78 ret = zpci_enable_device(zdev); 79 if (ret) 80 break; 81 pci_rescan_bus(zdev->bus); 82 break; 83 case 0x0302: /* Reserved -> Standby */ 84 clp_add_pci_device(ccdf->fid, ccdf->fh, 0); 85 break; 86 case 0x0303: /* Deconfiguration requested */ 87 if (pdev) 88 pci_stop_and_remove_bus_device(pdev); 89 90 ret = zpci_disable_device(zdev); 91 if (ret) 92 break; 93 94 ret = sclp_pci_deconfigure(zdev->fid); 95 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret); 96 if (!ret) 97 zdev->state = ZPCI_FN_STATE_STANDBY; 98 99 break; 100 case 0x0304: /* Configured -> Standby */ 101 if (pdev) 102 pci_stop_and_remove_bus_device(pdev); 103 104 zpci_disable_device(zdev); 105 zdev->state = ZPCI_FN_STATE_STANDBY; 106 break; 107 case 0x0306: /* 0x308 or 0x302 for multiple devices */ 108 clp_rescan_pci_devices(); 109 break; 110 case 0x0308: /* Standby -> Reserved */ 111 pci_stop_root_bus(zdev->bus); 112 pci_remove_root_bus(zdev->bus); 113 break; 114 default: 115 break; 116 } 117 } 118