1 // SPDX-License-Identifier: GPL-2.0
3 * PCI I/O adapter configuration related functions.
5 * Copyright IBM Corp. 2016
7 #define KMSG_COMPONENT "sclp_cmd"
8 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
10 #include <linux/completion.h>
11 #include <linux/export.h>
12 #include <linux/mutex.h>
13 #include <linux/errno.h>
14 #include <linux/slab.h>
15 #include <linux/init.h>
16 #include <linux/err.h>
22 #define SCLP_CMDW_CONFIGURE_PCI 0x001a0001
23 #define SCLP_CMDW_DECONFIGURE_PCI 0x001b0001
25 #define SCLP_ATYPE_PCI 2
27 #define SCLP_ERRNOTIFY_AQ_RESET 0
28 #define SCLP_ERRNOTIFY_AQ_REPAIR 1
29 #define SCLP_ERRNOTIFY_AQ_INFO_LOG 2
30 #define SCLP_ERRNOTIFY_AQ_OPTICS_DATA 3
32 static DEFINE_MUTEX(sclp_pci_mutex);
33 static struct sclp_register sclp_pci_event = {
34 .send_mask = EVTYP_ERRNOTIFY_MASK,
37 struct err_notify_evbuf {
38 struct evbuf_header header;
46 struct err_notify_sccb {
47 struct sccb_header header;
48 struct err_notify_evbuf evbuf;
52 struct sccb_header header;
53 u8 atype; /* adapter type */
56 u32 aid; /* adapter identifier */
59 static int do_pci_configure(sclp_cmdw_t cmd, u32 fid)
61 struct pci_cfg_sccb *sccb;
64 if (!SCLP_HAS_PCI_RECONFIG)
67 sccb = (struct pci_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
71 sccb->header.length = PAGE_SIZE;
72 sccb->atype = SCLP_ATYPE_PCI;
74 rc = sclp_sync_request(cmd, sccb);
77 switch (sccb->header.response_code) {
82 pr_warn("configure PCI I/O adapter failed: cmd=0x%08x response=0x%04x\n",
83 cmd, sccb->header.response_code);
88 free_page((unsigned long) sccb);
92 int sclp_pci_configure(u32 fid)
94 return do_pci_configure(SCLP_CMDW_CONFIGURE_PCI, fid);
96 EXPORT_SYMBOL(sclp_pci_configure);
98 int sclp_pci_deconfigure(u32 fid)
100 return do_pci_configure(SCLP_CMDW_DECONFIGURE_PCI, fid);
102 EXPORT_SYMBOL(sclp_pci_deconfigure);
104 static void sclp_pci_callback(struct sclp_req *req, void *data)
106 struct completion *completion = data;
108 complete(completion);
111 static int sclp_pci_check_report(struct zpci_report_error_header *report)
113 if (report->version != 1)
116 switch (report->action) {
117 case SCLP_ERRNOTIFY_AQ_RESET:
118 case SCLP_ERRNOTIFY_AQ_REPAIR:
119 case SCLP_ERRNOTIFY_AQ_INFO_LOG:
120 case SCLP_ERRNOTIFY_AQ_OPTICS_DATA:
126 if (report->length > (PAGE_SIZE - sizeof(struct err_notify_sccb)))
132 int sclp_pci_report(struct zpci_report_error_header *report, u32 fh, u32 fid)
134 DECLARE_COMPLETION_ONSTACK(completion);
135 struct err_notify_sccb *sccb;
139 ret = sclp_pci_check_report(report);
143 mutex_lock(&sclp_pci_mutex);
144 ret = sclp_register(&sclp_pci_event);
148 if (!(sclp_pci_event.sclp_receive_mask & EVTYP_ERRNOTIFY_MASK)) {
153 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
159 memset(&req, 0, sizeof(req));
160 req.callback_data = &completion;
161 req.callback = sclp_pci_callback;
162 req.command = SCLP_CMDW_WRITE_EVENT_DATA;
163 req.status = SCLP_REQ_FILLED;
166 sccb->evbuf.header.length = sizeof(sccb->evbuf) + report->length;
167 sccb->evbuf.header.type = EVTYP_ERRNOTIFY;
168 sccb->header.length = sizeof(sccb->header) + sccb->evbuf.header.length;
170 sccb->evbuf.action = report->action;
171 sccb->evbuf.atype = SCLP_ATYPE_PCI;
173 sccb->evbuf.fid = fid;
175 memcpy(sccb->evbuf.data, report->data, report->length);
177 ret = sclp_add_request(&req);
181 wait_for_completion(&completion);
182 if (req.status != SCLP_REQ_DONE) {
183 pr_warn("request failed (status=0x%02x)\n",
189 if (sccb->header.response_code != 0x0020) {
190 pr_warn("request failed with response code 0x%x\n",
191 sccb->header.response_code);
196 free_page((unsigned long) sccb);
198 sclp_unregister(&sclp_pci_event);
200 mutex_unlock(&sclp_pci_mutex);