1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright IBM Corp. 2012
6 * Jan Glauber <jang@linux.vnet.ibm.com>
9 #define KMSG_COMPONENT "zpci"
10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
12 #include <linux/kernel.h>
13 #include <linux/pci.h>
14 #include <asm/pci_debug.h>
19 /* Content Code Description for PCI Function Error */
20 struct zpci_ccdf_err {
22 u32 fh; /* function handle */
23 u32 fid; /* function id */
24 u32 ett : 4; /* expected table type */
25 u32 mvn : 12; /* MSI vector number */
26 u32 dmaas : 8; /* DMA address space */
28 u32 q : 1; /* event qualifier */
29 u32 rw : 1; /* read/write */
30 u64 faddr; /* failing address */
33 u16 pec; /* PCI event code */
36 /* Content Code Description for PCI Function Availability */
37 struct zpci_ccdf_avail {
39 u32 fh; /* function handle */
40 u32 fid; /* function id */
46 u16 pec; /* PCI event code */
49 static void __zpci_event_error(struct zpci_ccdf_err *ccdf)
51 struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
52 struct pci_dev *pdev = NULL;
54 zpci_err("error CCDF:\n");
55 zpci_err_hex(ccdf, sizeof(*ccdf));
58 pdev = pci_get_slot(zdev->zbus->bus, zdev->devfn);
60 pr_err("%s: Event 0x%x reports an error for PCI function 0x%x\n",
61 pdev ? pci_name(pdev) : "n/a", ccdf->pec, ccdf->fid);
66 pdev->error_state = pci_channel_io_perm_failure;
70 void zpci_event_error(void *data)
72 if (zpci_is_enabled())
73 __zpci_event_error(data);
76 static void __zpci_event_availability(struct zpci_ccdf_avail *ccdf)
78 struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
79 struct pci_dev *pdev = NULL;
80 enum zpci_state state;
83 if (zdev && zdev->zbus && zdev->zbus->bus)
84 pdev = pci_get_slot(zdev->zbus->bus, zdev->devfn);
86 zpci_err("avail CCDF:\n");
87 zpci_err_hex(ccdf, sizeof(*ccdf));
90 case 0x0301: /* Reserved|Standby -> Configured */
92 ret = clp_add_pci_device(ccdf->fid, ccdf->fh, 1);
96 zdev->state = ZPCI_FN_STATE_CONFIGURED;
97 ret = zpci_enable_device(zdev);
101 pdev = pci_scan_single_device(zdev->zbus->bus, zdev->devfn);
105 pci_bus_add_device(pdev);
106 pci_lock_rescan_remove();
107 pci_bus_add_devices(zdev->zbus->bus);
108 pci_unlock_rescan_remove();
110 case 0x0302: /* Reserved -> Standby */
112 clp_add_pci_device(ccdf->fid, ccdf->fh, 0);
117 case 0x0303: /* Deconfiguration requested */
121 pci_stop_and_remove_bus_device_locked(pdev);
123 ret = zpci_disable_device(zdev);
127 ret = sclp_pci_deconfigure(zdev->fid);
128 zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret);
130 zdev->state = ZPCI_FN_STATE_STANDBY;
133 case 0x0304: /* Configured -> Standby|Reserved */
137 /* Give the driver a hint that the function is
138 * already unusable. */
139 pdev->error_state = pci_channel_io_perm_failure;
140 pci_stop_and_remove_bus_device_locked(pdev);
143 zdev->state = ZPCI_FN_STATE_STANDBY;
144 if (!clp_get_state(ccdf->fid, &state) &&
145 state == ZPCI_FN_STATE_RESERVED) {
149 case 0x0306: /* 0x308 or 0x302 for multiple devices */
150 clp_rescan_pci_devices();
152 case 0x0308: /* Standby -> Reserved */
162 void zpci_event_availability(void *data)
164 if (zpci_is_enabled())
165 __zpci_event_availability(data);