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/compat.h>
13 #include <linux/kernel.h>
14 #include <linux/miscdevice.h>
15 #include <linux/slab.h>
16 #include <linux/err.h>
17 #include <linux/delay.h>
18 #include <linux/pci.h>
19 #include <linux/uaccess.h>
20 #include <asm/pci_debug.h>
21 #include <asm/pci_clp.h>
23 #include <uapi/asm/clp.h>
27 void update_uid_checking(bool new)
29 if (zpci_unique_uid != new)
30 zpci_dbg(1, "uid checking:%d\n", new);
32 zpci_unique_uid = new;
35 static inline void zpci_err_clp(unsigned int rsp, int rc)
40 } __packed data = {rsp, rc};
42 zpci_err_hex(&data, sizeof(data));
46 * Call Logical Processor with c=1, lps=0 and command 1
47 * to get the bit mask of installed logical processors
49 static inline int clp_get_ilp(unsigned long *ilp)
55 " .insn rrf,0xb9a00000,%[mask],%[cmd],8,0\n"
60 : [cc] "+d" (cc), [mask] "=d" (mask) : [cmd] "a" (1)
67 * Call Logical Processor with c=0, the give constant lps and an lpcb request.
69 static __always_inline int clp_req(void *data, unsigned int lps)
71 struct { u8 _[CLP_BLK_SIZE]; } *req = data;
76 " .insn rrf,0xb9a00000,%[ign],%[req],0,%[lps]\n"
81 : [cc] "+d" (cc), [ign] "=d" (ignored), "+m" (*req)
82 : [req] "a" (req), [lps] "i" (lps)
87 static void *clp_alloc_block(gfp_t gfp_mask)
89 return (void *) __get_free_pages(gfp_mask, get_order(CLP_BLK_SIZE));
92 static void clp_free_block(void *ptr)
94 free_pages((unsigned long) ptr, get_order(CLP_BLK_SIZE));
97 static void clp_store_query_pci_fngrp(struct zpci_dev *zdev,
98 struct clp_rsp_query_pci_grp *response)
100 zdev->tlb_refresh = response->refresh;
101 zdev->dma_mask = response->dasm;
102 zdev->msi_addr = response->msia;
103 zdev->max_msi = response->noi;
104 zdev->fmb_update = response->mui;
105 zdev->version = response->version;
107 switch (response->version) {
109 zdev->max_bus_speed = PCIE_SPEED_5_0GT;
112 zdev->max_bus_speed = PCI_SPEED_UNKNOWN;
117 static int clp_query_pci_fngrp(struct zpci_dev *zdev, u8 pfgid)
119 struct clp_req_rsp_query_pci_grp *rrb;
122 rrb = clp_alloc_block(GFP_KERNEL);
126 memset(rrb, 0, sizeof(*rrb));
127 rrb->request.hdr.len = sizeof(rrb->request);
128 rrb->request.hdr.cmd = CLP_QUERY_PCI_FNGRP;
129 rrb->response.hdr.len = sizeof(rrb->response);
130 rrb->request.pfgid = pfgid;
132 rc = clp_req(rrb, CLP_LPS_PCI);
133 if (!rc && rrb->response.hdr.rsp == CLP_RC_OK)
134 clp_store_query_pci_fngrp(zdev, &rrb->response);
136 zpci_err("Q PCI FGRP:\n");
137 zpci_err_clp(rrb->response.hdr.rsp, rc);
144 static int clp_store_query_pci_fn(struct zpci_dev *zdev,
145 struct clp_rsp_query_pci *response)
149 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
150 zdev->bars[i].val = le32_to_cpu(response->bar[i]);
151 zdev->bars[i].size = response->bar_size[i];
153 zdev->start_dma = response->sdma;
154 zdev->end_dma = response->edma;
155 zdev->pchid = response->pchid;
156 zdev->pfgid = response->pfgid;
157 zdev->pft = response->pft;
158 zdev->vfn = response->vfn;
159 zdev->port = response->port;
160 zdev->uid = response->uid;
161 zdev->fmb_length = sizeof(u32) * response->fmb_len;
162 zdev->rid_available = response->rid_avail;
163 zdev->is_physfn = response->is_physfn;
164 if (!s390_pci_no_rid && zdev->rid_available)
165 zdev->devfn = response->rid & ZPCI_RID_MASK_DEVFN;
167 memcpy(zdev->pfip, response->pfip, sizeof(zdev->pfip));
168 if (response->util_str_avail) {
169 memcpy(zdev->util_str, response->util_str,
170 sizeof(zdev->util_str));
171 zdev->util_str_avail = 1;
173 zdev->mio_capable = response->mio_addr_avail;
174 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
175 if (!(response->mio.valid & (1 << (PCI_STD_NUM_BARS - i - 1))))
178 zdev->bars[i].mio_wb = (void __iomem *) response->mio.addr[i].wb;
179 zdev->bars[i].mio_wt = (void __iomem *) response->mio.addr[i].wt;
184 int clp_query_pci_fn(struct zpci_dev *zdev)
186 struct clp_req_rsp_query_pci *rrb;
189 rrb = clp_alloc_block(GFP_KERNEL);
193 memset(rrb, 0, sizeof(*rrb));
194 rrb->request.hdr.len = sizeof(rrb->request);
195 rrb->request.hdr.cmd = CLP_QUERY_PCI_FN;
196 rrb->response.hdr.len = sizeof(rrb->response);
197 rrb->request.fh = zdev->fh;
199 rc = clp_req(rrb, CLP_LPS_PCI);
200 if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
201 rc = clp_store_query_pci_fn(zdev, &rrb->response);
204 rc = clp_query_pci_fngrp(zdev, rrb->response.pfgid);
206 zpci_err("Q PCI FN:\n");
207 zpci_err_clp(rrb->response.hdr.rsp, rc);
216 * clp_set_pci_fn() - Execute a command on a PCI function
217 * @zdev: Function that will be affected
218 * @fh: Out parameter for updated function handle
219 * @nr_dma_as: DMA address space number
220 * @command: The command code to execute
222 * Returns: 0 on success, < 0 for Linux errors (e.g. -ENOMEM), and
223 * > 0 for non-success platform responses
225 static int clp_set_pci_fn(struct zpci_dev *zdev, u32 *fh, u8 nr_dma_as, u8 command)
227 struct clp_req_rsp_set_pci *rrb;
228 int rc, retries = 100;
231 rrb = clp_alloc_block(GFP_KERNEL);
236 memset(rrb, 0, sizeof(*rrb));
237 rrb->request.hdr.len = sizeof(rrb->request);
238 rrb->request.hdr.cmd = CLP_SET_PCI_FN;
239 rrb->response.hdr.len = sizeof(rrb->response);
240 rrb->request.fh = zdev->fh;
241 rrb->request.oc = command;
242 rrb->request.ndas = nr_dma_as;
244 rc = clp_req(rrb, CLP_LPS_PCI);
245 if (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY) {
251 } while (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY);
253 if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
254 *fh = rrb->response.fh;
256 zpci_err("Set PCI FN:\n");
257 zpci_err_clp(rrb->response.hdr.rsp, rc);
259 rc = rrb->response.hdr.rsp;
265 int clp_setup_writeback_mio(void)
267 struct clp_req_rsp_slpc_pci *rrb;
271 rrb = clp_alloc_block(GFP_KERNEL);
275 memset(rrb, 0, sizeof(*rrb));
276 rrb->request.hdr.len = sizeof(rrb->request);
277 rrb->request.hdr.cmd = CLP_SLPC;
278 rrb->response.hdr.len = sizeof(rrb->response);
280 rc = clp_req(rrb, CLP_LPS_PCI);
281 if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
282 if (rrb->response.vwb) {
283 wb_bit_pos = rrb->response.mio_wb;
284 set_bit_inv(wb_bit_pos, &mio_wb_bit_mask);
285 zpci_dbg(3, "wb bit: %d\n", wb_bit_pos);
287 zpci_dbg(3, "wb bit: n.a.\n");
291 zpci_err("SLPC PCI:\n");
292 zpci_err_clp(rrb->response.hdr.rsp, rc);
299 int clp_enable_fh(struct zpci_dev *zdev, u32 *fh, u8 nr_dma_as)
303 rc = clp_set_pci_fn(zdev, fh, nr_dma_as, CLP_SET_ENABLE_PCI_FN);
304 zpci_dbg(3, "ena fid:%x, fh:%x, rc:%d\n", zdev->fid, *fh, rc);
305 if (!rc && zpci_use_mio(zdev)) {
306 rc = clp_set_pci_fn(zdev, fh, nr_dma_as, CLP_SET_ENABLE_MIO);
307 zpci_dbg(3, "ena mio fid:%x, fh:%x, rc:%d\n",
310 clp_disable_fh(zdev, fh);
315 int clp_disable_fh(struct zpci_dev *zdev, u32 *fh)
319 if (!zdev_enabled(zdev))
322 rc = clp_set_pci_fn(zdev, fh, 0, CLP_SET_DISABLE_PCI_FN);
323 zpci_dbg(3, "dis fid:%x, fh:%x, rc:%d\n", zdev->fid, *fh, rc);
327 static int clp_list_pci_req(struct clp_req_rsp_list_pci *rrb,
328 u64 *resume_token, int *nentries)
332 memset(rrb, 0, sizeof(*rrb));
333 rrb->request.hdr.len = sizeof(rrb->request);
334 rrb->request.hdr.cmd = CLP_LIST_PCI;
335 /* store as many entries as possible */
336 rrb->response.hdr.len = CLP_BLK_SIZE - LIST_PCI_HDR_LEN;
337 rrb->request.resume_token = *resume_token;
339 /* Get PCI function handle list */
340 rc = clp_req(rrb, CLP_LPS_PCI);
341 if (rc || rrb->response.hdr.rsp != CLP_RC_OK) {
342 zpci_err("List PCI FN:\n");
343 zpci_err_clp(rrb->response.hdr.rsp, rc);
347 update_uid_checking(rrb->response.uid_checking);
348 WARN_ON_ONCE(rrb->response.entry_size !=
349 sizeof(struct clp_fh_list_entry));
351 *nentries = (rrb->response.hdr.len - LIST_PCI_HDR_LEN) /
352 rrb->response.entry_size;
353 *resume_token = rrb->response.resume_token;
358 static int clp_list_pci(struct clp_req_rsp_list_pci *rrb, void *data,
359 void (*cb)(struct clp_fh_list_entry *, void *))
361 u64 resume_token = 0;
365 rc = clp_list_pci_req(rrb, &resume_token, &nentries);
368 for (i = 0; i < nentries; i++)
369 cb(&rrb->response.fh_list[i], data);
370 } while (resume_token);
375 static int clp_find_pci(struct clp_req_rsp_list_pci *rrb, u32 fid,
376 struct clp_fh_list_entry *entry)
378 struct clp_fh_list_entry *fh_list;
379 u64 resume_token = 0;
383 rc = clp_list_pci_req(rrb, &resume_token, &nentries);
386 for (i = 0; i < nentries; i++) {
387 fh_list = rrb->response.fh_list;
388 if (fh_list[i].fid == fid) {
393 } while (resume_token);
398 static void __clp_add(struct clp_fh_list_entry *entry, void *data)
400 struct zpci_dev *zdev;
402 if (!entry->vendor_id)
405 zdev = get_zdev_by_fid(entry->fid);
407 zpci_create_device(entry->fid, entry->fh, entry->config_state);
410 int clp_scan_pci_devices(void)
412 struct clp_req_rsp_list_pci *rrb;
415 rrb = clp_alloc_block(GFP_KERNEL);
419 rc = clp_list_pci(rrb, NULL, __clp_add);
426 * Get the current function handle of the function matching @fid
428 int clp_refresh_fh(u32 fid, u32 *fh)
430 struct clp_req_rsp_list_pci *rrb;
431 struct clp_fh_list_entry entry;
434 rrb = clp_alloc_block(GFP_NOWAIT);
438 rc = clp_find_pci(rrb, fid, &entry);
446 int clp_get_state(u32 fid, enum zpci_state *state)
448 struct clp_req_rsp_list_pci *rrb;
449 struct clp_fh_list_entry entry;
452 *state = ZPCI_FN_STATE_RESERVED;
453 rrb = clp_alloc_block(GFP_ATOMIC);
457 rc = clp_find_pci(rrb, fid, &entry);
459 *state = entry.config_state;
465 static int clp_base_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
467 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
469 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
470 lpcb->response.hdr.len > limit)
472 return clp_req(lpcb, CLP_LPS_BASE) ? -EOPNOTSUPP : 0;
475 static int clp_base_command(struct clp_req *req, struct clp_req_hdr *lpcb)
478 case 0x0001: /* store logical-processor characteristics */
479 return clp_base_slpc(req, (void *) lpcb);
485 static int clp_pci_slpc(struct clp_req *req, struct clp_req_rsp_slpc_pci *lpcb)
487 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
489 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
490 lpcb->response.hdr.len > limit)
492 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
495 static int clp_pci_list(struct clp_req *req, struct clp_req_rsp_list_pci *lpcb)
497 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
499 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
500 lpcb->response.hdr.len > limit)
502 if (lpcb->request.reserved2 != 0)
504 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
507 static int clp_pci_query(struct clp_req *req,
508 struct clp_req_rsp_query_pci *lpcb)
510 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
512 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
513 lpcb->response.hdr.len > limit)
515 if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0)
517 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
520 static int clp_pci_query_grp(struct clp_req *req,
521 struct clp_req_rsp_query_pci_grp *lpcb)
523 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
525 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
526 lpcb->response.hdr.len > limit)
528 if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0 ||
529 lpcb->request.reserved4 != 0)
531 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
534 static int clp_pci_command(struct clp_req *req, struct clp_req_hdr *lpcb)
537 case 0x0001: /* store logical-processor characteristics */
538 return clp_pci_slpc(req, (void *) lpcb);
539 case 0x0002: /* list PCI functions */
540 return clp_pci_list(req, (void *) lpcb);
541 case 0x0003: /* query PCI function */
542 return clp_pci_query(req, (void *) lpcb);
543 case 0x0004: /* query PCI function group */
544 return clp_pci_query_grp(req, (void *) lpcb);
550 static int clp_normal_command(struct clp_req *req)
552 struct clp_req_hdr *lpcb;
557 if (req->lps != 0 && req->lps != 2)
561 lpcb = clp_alloc_block(GFP_KERNEL);
566 uptr = (void __force __user *)(unsigned long) req->data_p;
567 if (copy_from_user(lpcb, uptr, PAGE_SIZE) != 0)
571 if (lpcb->fmt != 0 || lpcb->reserved1 != 0 || lpcb->reserved2 != 0)
576 rc = clp_base_command(req, lpcb);
579 rc = clp_pci_command(req, lpcb);
586 if (copy_to_user(uptr, lpcb, PAGE_SIZE) != 0)
592 clp_free_block(lpcb);
597 static int clp_immediate_command(struct clp_req *req)
603 if (req->cmd > 1 || clp_get_ilp(&ilp) != 0)
606 uptr = (void __force __user *)(unsigned long) req->data_p;
608 /* Command code 0: test for a specific processor */
609 exists = test_bit_inv(req->lps, &ilp);
610 return put_user(exists, (int __user *) uptr);
612 /* Command code 1: return bit mask of installed processors */
613 return put_user(ilp, (unsigned long __user *) uptr);
616 static long clp_misc_ioctl(struct file *filp, unsigned int cmd,
625 argp = is_compat_task() ? compat_ptr(arg) : (void __user *) arg;
626 if (copy_from_user(&req, argp, sizeof(req)))
630 return req.c ? clp_immediate_command(&req) : clp_normal_command(&req);
633 static int clp_misc_release(struct inode *inode, struct file *filp)
638 static const struct file_operations clp_misc_fops = {
639 .owner = THIS_MODULE,
640 .open = nonseekable_open,
641 .release = clp_misc_release,
642 .unlocked_ioctl = clp_misc_ioctl,
643 .compat_ioctl = clp_misc_ioctl,
647 static struct miscdevice clp_misc_device = {
648 .minor = MISC_DYNAMIC_MINOR,
650 .fops = &clp_misc_fops,
653 static int __init clp_misc_init(void)
655 return misc_register(&clp_misc_device);
658 device_initcall(clp_misc_init);