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