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 <[email protected]>
   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/pci_dma.h>
  16 #include <asm/sclp.h>
  17
  18 #include "pci_bus.h"
  19
  20 /* Content Code Description for PCI Function Error */
  21 struct zpci_ccdf_err {
  22         u32 reserved1;
  23         u32 fh;                         /* function handle */
  24         u32 fid;                        /* function id */
  25         u32 ett         :  4;           /* expected table type */
  26         u32 mvn         : 12;           /* MSI vector number */
  27         u32 dmaas       :  8;           /* DMA address space */
  28         u32             :  6;
  29         u32 q           :  1;           /* event qualifier */
  30         u32 rw          :  1;           /* read/write */
  31         u64 faddr;                      /* failing address */
  32         u32 reserved3;
  33         u16 reserved4;
  34         u16 pec;                        /* PCI event code */
  35 } __packed;
  36
  37 /* Content Code Description for PCI Function Availability */
  38 struct zpci_ccdf_avail {
  39         u32 reserved1;
  40         u32 fh;                         /* function handle */
  41         u32 fid;                        /* function id */
  42         u32 reserved2;
  43         u32 reserved3;
  44         u32 reserved4;
  45         u32 reserved5;
  46         u16 reserved6;
  47         u16 pec;                        /* PCI event code */
  48 } __packed;
  49
  50 static void __zpci_event_error(struct zpci_ccdf_err *ccdf)
  51 {
  52         struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
  53         struct pci_dev *pdev = NULL;
  54
  55         zpci_err("error CCDF:\n");
  56         zpci_err_hex(ccdf, sizeof(*ccdf));
  57
  58         if (zdev)
  59                 pdev = pci_get_slot(zdev->zbus->bus, zdev->devfn);
  60
  61         pr_err("%s: Event 0x%x reports an error for PCI function 0x%x\n",
  62                pdev ? pci_name(pdev) : "n/a", ccdf->pec, ccdf->fid);
  63
  64         if (!pdev)
  65                 return;
  66
  67         pdev->error_state = pci_channel_io_perm_failure;
  68         pci_dev_put(pdev);
  69 }
  70
  71 void zpci_event_error(void *data)
  72 {
  73         if (zpci_is_enabled())
  74                 __zpci_event_error(data);
  75 }
  76
  77 static void zpci_event_hard_deconfigured(struct zpci_dev *zdev, u32 fh)
  78 {
  79         zdev->fh = fh;
  80         /* Give the driver a hint that the function is
  81          * already unusable.
  82          */
  83         zpci_bus_remove_device(zdev, true);
  84         /* Even though the device is already gone we still
  85          * need to free zPCI resources as part of the disable.
  86          */
  87         if (zdev->dma_table)
  88                 zpci_dma_exit_device(zdev);
  89         if (zdev_enabled(zdev))
  90                 zpci_disable_device(zdev);
  91         zdev->state = ZPCI_FN_STATE_STANDBY;
  92 }
  93
  94 static void __zpci_event_availability(struct zpci_ccdf_avail *ccdf)
  95 {
  96         struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
  97         enum zpci_state state;
  98
  99         zpci_err("avail CCDF:\n");
 100         zpci_err_hex(ccdf, sizeof(*ccdf));
 101
 102         switch (ccdf->pec) {
 103         case 0x0301: /* Reserved|Standby -> Configured */
 104                 if (!zdev) {
 105                         zdev = zpci_create_device(ccdf->fid, ccdf->fh, ZPCI_FN_STATE_CONFIGURED);
 106                         if (IS_ERR(zdev))
 107                                 break;
 108                 } else {
 109                         /* the configuration request may be stale */
 110                         if (zdev->state != ZPCI_FN_STATE_STANDBY)
 111                                 break;
 112                         zdev->state = ZPCI_FN_STATE_CONFIGURED;
 113                 }
 114                 zpci_scan_configured_device(zdev, ccdf->fh);
 115                 break;
 116         case 0x0302: /* Reserved -> Standby */
 117                 if (!zdev)
 118                         zpci_create_device(ccdf->fid, ccdf->fh, ZPCI_FN_STATE_STANDBY);
 119                 else
 120                         zdev->fh = ccdf->fh;
 121                 break;
 122         case 0x0303: /* Deconfiguration requested */
 123                 if (zdev) {
 124                         /* The event may have been queued before we confirgured
 125                          * the device.
 126                          */
 127                         if (zdev->state != ZPCI_FN_STATE_CONFIGURED)
 128                                 break;
 129                         zdev->fh = ccdf->fh;
 130                         zpci_deconfigure_device(zdev);
 131                 }
 132                 break;
 133         case 0x0304: /* Configured -> Standby|Reserved */
 134                 if (zdev) {
 135                         /* The event may have been queued before we confirgured
 136                          * the device.:
 137                          */
 138                         if (zdev->state == ZPCI_FN_STATE_CONFIGURED)
 139                                 zpci_event_hard_deconfigured(zdev, ccdf->fh);
 140                         /* The 0x0304 event may immediately reserve the device */
 141                         if (!clp_get_state(zdev->fid, &state) &&
 142                             state == ZPCI_FN_STATE_RESERVED) {
 143                                 zpci_zdev_put(zdev);
 144                         }
 145                 }
 146                 break;
 147         case 0x0306: /* 0x308 or 0x302 for multiple devices */
 148                 zpci_remove_reserved_devices();
 149                 clp_scan_pci_devices();
 150                 break;
 151         case 0x0308: /* Standby -> Reserved */
 152                 if (!zdev)
 153                         break;
 154                 zpci_zdev_put(zdev);
 155                 break;
 156         default:
 157                 break;
 158         }
 159 }
 160
 161 void zpci_event_availability(void *data)
 162 {
 163         if (zpci_is_enabled())
 164                 __zpci_event_availability(data);
 165 }