arch/s390/pci/pci_event.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  Copyright IBM Corp. 2012
   4  *
   5  *  Author(s):
   6  *    Jan Glauber <jang@linux.vnet.ibm.com>
   7  */
   8
   9 #define KMSG_COMPONENT "zpci"
  10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  11
  12 #include <linux/kernel.h>
  13 #include <linux/pci.h>
  14 #include <asm/pci_debug.h>
  15 #include <asm/sclp.h>
  16
  17 /* Content Code Description for PCI Function Error */
  18 struct zpci_ccdf_err {
  19         u32 reserved1;
  20         u32 fh;                         /* function handle */
  21         u32 fid;                        /* function id */
  22         u32 ett         :  4;           /* expected table type */
  23         u32 mvn         : 12;           /* MSI vector number */
  24         u32 dmaas       :  8;           /* DMA address space */
  25         u32             :  6;
  26         u32 q           :  1;           /* event qualifier */
  27         u32 rw          :  1;           /* read/write */
  28         u64 faddr;                      /* failing address */
  29         u32 reserved3;
  30         u16 reserved4;
  31         u16 pec;                        /* PCI event code */
  32 } __packed;
  33
  34 /* Content Code Description for PCI Function Availability */
  35 struct zpci_ccdf_avail {
  36         u32 reserved1;
  37         u32 fh;                         /* function handle */
  38         u32 fid;                        /* function id */
  39         u32 reserved2;
  40         u32 reserved3;
  41         u32 reserved4;
  42         u32 reserved5;
  43         u16 reserved6;
  44         u16 pec;                        /* PCI event code */
  45 } __packed;
  46
  47 static void __zpci_event_error(struct zpci_ccdf_err *ccdf)
  48 {
  49         struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
  50         struct pci_dev *pdev = NULL;
  51
  52         zpci_err("error CCDF:\n");
  53         zpci_err_hex(ccdf, sizeof(*ccdf));
  54
  55         if (zdev)
  56                 pdev = pci_get_slot(zdev->bus, ZPCI_DEVFN);
  57
  58         pr_err("%s: Event 0x%x reports an error for PCI function 0x%x\n",
  59                pdev ? pci_name(pdev) : "n/a", ccdf->pec, ccdf->fid);
  60
  61         if (!pdev)
  62                 return;
  63
  64         pdev->error_state = pci_channel_io_perm_failure;
  65         pci_dev_put(pdev);
  66 }
  67
  68 void zpci_event_error(void *data)
  69 {
  70         if (zpci_is_enabled())
  71                 __zpci_event_error(data);
  72 }
  73
  74 static void __zpci_event_availability(struct zpci_ccdf_avail *ccdf)
  75 {
  76         struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
  77         struct pci_dev *pdev = NULL;
  78         enum zpci_state state;
  79         int ret;
  80
  81         if (zdev)
  82                 pdev = pci_get_slot(zdev->bus, ZPCI_DEVFN);
  83
  84         pr_info("%s: Event 0x%x reconfigured PCI function 0x%x\n",
  85                 pdev ? pci_name(pdev) : "n/a", ccdf->pec, ccdf->fid);
  86         zpci_err("avail CCDF:\n");
  87         zpci_err_hex(ccdf, sizeof(*ccdf));
  88
  89         switch (ccdf->pec) {
  90         case 0x0301: /* Reserved|Standby -> Configured */
  91                 if (!zdev) {
  92                         ret = clp_add_pci_device(ccdf->fid, ccdf->fh, 0);
  93                         if (ret)
  94                                 break;
  95                         zdev = get_zdev_by_fid(ccdf->fid);
  96                 }
  97                 if (!zdev || zdev->state != ZPCI_FN_STATE_STANDBY)
  98                         break;
  99                 zdev->state = ZPCI_FN_STATE_CONFIGURED;
 100                 zdev->fh = ccdf->fh;
 101                 ret = zpci_enable_device(zdev);
 102                 if (ret)
 103                         break;
 104                 pci_lock_rescan_remove();
 105                 pci_rescan_bus(zdev->bus);
 106                 pci_unlock_rescan_remove();
 107                 break;
 108         case 0x0302: /* Reserved -> Standby */
 109                 if (!zdev)
 110                         clp_add_pci_device(ccdf->fid, ccdf->fh, 0);
 111                 break;
 112         case 0x0303: /* Deconfiguration requested */
 113                 if (!zdev)
 114                         break;
 115                 if (pdev)
 116                         pci_stop_and_remove_bus_device_locked(pdev);
 117
 118                 ret = zpci_disable_device(zdev);
 119                 if (ret)
 120                         break;
 121
 122                 ret = sclp_pci_deconfigure(zdev->fid);
 123                 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret);
 124                 if (!ret)
 125                         zdev->state = ZPCI_FN_STATE_STANDBY;
 126
 127                 break;
 128         case 0x0304: /* Configured -> Standby|Reserved */
 129                 if (!zdev)
 130                         break;
 131                 if (pdev) {
 132                         /* Give the driver a hint that the function is
 133                          * already unusable. */
 134                         pdev->error_state = pci_channel_io_perm_failure;
 135                         pci_stop_and_remove_bus_device_locked(pdev);
 136                 }
 137
 138                 zdev->fh = ccdf->fh;
 139                 zpci_disable_device(zdev);
 140                 zdev->state = ZPCI_FN_STATE_STANDBY;
 141                 if (!clp_get_state(ccdf->fid, &state) &&
 142                     state == ZPCI_FN_STATE_RESERVED) {
 143                         zpci_remove_device(zdev);
 144                 }
 145                 break;
 146         case 0x0306: /* 0x308 or 0x302 for multiple devices */
 147                 clp_rescan_pci_devices();
 148                 break;
 149         case 0x0308: /* Standby -> Reserved */
 150                 if (!zdev)
 151                         break;
 152                 zpci_remove_device(zdev);
 153                 break;
 154         default:
 155                 break;
 156         }
 157         pci_dev_put(pdev);
 158 }
 159
 160 void zpci_event_availability(void *data)
 161 {
 162         if (zpci_is_enabled())
 163                 __zpci_event_availability(data);
 164 }