arch/s390/pci/pci_event.c

   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 }