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 = 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         if (!pdev)
  58                 return;
  59
  60         pdev->error_state = pci_channel_io_perm_failure;
  61 }
  62
  63 void zpci_event_error(void *data)
  64 {
  65         if (zpci_is_enabled())
  66                 __zpci_event_error(data);
  67 }
  68
  69 static void __zpci_event_availability(struct zpci_ccdf_avail *ccdf)
  70 {
  71         struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
  72         struct pci_dev *pdev = zdev ? zdev->pdev : NULL;
  73         int ret;
  74
  75         pr_info("%s: Event 0x%x reconfigured PCI function 0x%x\n",
  76                 pdev ? pci_name(pdev) : "n/a", ccdf->pec, ccdf->fid);
  77         zpci_err("avail CCDF:\n");
  78         zpci_err_hex(ccdf, sizeof(*ccdf));
  79
  80         switch (ccdf->pec) {
  81         case 0x0301: /* Reserved|Standby -> Configured */
  82                 if (!zdev) {
  83                         ret = clp_add_pci_device(ccdf->fid, ccdf->fh, 0);
  84                         if (ret)
  85                                 break;
  86                         zdev = get_zdev_by_fid(ccdf->fid);
  87                 }
  88                 if (!zdev || zdev->state != ZPCI_FN_STATE_STANDBY)
  89                         break;
  90                 zdev->state = ZPCI_FN_STATE_CONFIGURED;
  91                 zdev->fh = ccdf->fh;
  92                 ret = zpci_enable_device(zdev);
  93                 if (ret)
  94                         break;
  95                 pci_lock_rescan_remove();
  96                 pci_rescan_bus(zdev->bus);
  97                 pci_unlock_rescan_remove();
  98                 break;
  99         case 0x0302: /* Reserved -> Standby */
 100                 if (!zdev)
 101                         clp_add_pci_device(ccdf->fid, ccdf->fh, 0);
 102                 break;
 103         case 0x0303: /* Deconfiguration requested */
 104                 if (pdev)
 105                         pci_stop_and_remove_bus_device_locked(pdev);
 106
 107                 ret = zpci_disable_device(zdev);
 108                 if (ret)
 109                         break;
 110
 111                 ret = sclp_pci_deconfigure(zdev->fid);
 112                 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret);
 113                 if (!ret)
 114                         zdev->state = ZPCI_FN_STATE_STANDBY;
 115
 116                 break;
 117         case 0x0304: /* Configured -> Standby */
 118                 if (pdev) {
 119                         /* Give the driver a hint that the function is
 120                          * already unusable. */
 121                         pdev->error_state = pci_channel_io_perm_failure;
 122                         pci_stop_and_remove_bus_device_locked(pdev);
 123                 }
 124
 125                 zdev->fh = ccdf->fh;
 126                 zpci_disable_device(zdev);
 127                 zdev->state = ZPCI_FN_STATE_STANDBY;
 128                 break;
 129         case 0x0306: /* 0x308 or 0x302 for multiple devices */
 130                 clp_rescan_pci_devices();
 131                 break;
 132         case 0x0308: /* Standby -> Reserved */
 133                 if (!zdev)
 134                         break;
 135                 pci_stop_root_bus(zdev->bus);
 136                 pci_remove_root_bus(zdev->bus);
 137                 break;
 138         default:
 139                 break;
 140         }
 141 }
 142
 143 void zpci_event_availability(void *data)
 144 {
 145         if (zpci_is_enabled())
 146                 __zpci_event_availability(data);
 147 }