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Linux/arch/s390/pci/pci_event.c

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  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 }
165 

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