1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright IBM Corp. 2012
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 static 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 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;
106 switch (response->version) {
108 zdev->max_bus_speed = PCIE_SPEED_5_0GT;
111 zdev->max_bus_speed = PCI_SPEED_UNKNOWN;
116 static int clp_query_pci_fngrp(struct zpci_dev *zdev, u8 pfgid)
118 struct clp_req_rsp_query_pci_grp *rrb;
121 rrb = clp_alloc_block(GFP_KERNEL);
125 memset(rrb, 0, sizeof(*rrb));
126 rrb->request.hdr.len = sizeof(rrb->request);
127 rrb->request.hdr.cmd = CLP_QUERY_PCI_FNGRP;
128 rrb->response.hdr.len = sizeof(rrb->response);
129 rrb->request.pfgid = pfgid;
131 rc = clp_req(rrb, CLP_LPS_PCI);
132 if (!rc && rrb->response.hdr.rsp == CLP_RC_OK)
133 clp_store_query_pci_fngrp(zdev, &rrb->response);
135 zpci_err("Q PCI FGRP:\n");
136 zpci_err_clp(rrb->response.hdr.rsp, rc);
143 static int clp_store_query_pci_fn(struct zpci_dev *zdev,
144 struct clp_rsp_query_pci *response)
148 for (i = 0; i < PCI_BAR_COUNT; i++) {
149 zdev->bars[i].val = le32_to_cpu(response->bar[i]);
150 zdev->bars[i].size = response->bar_size[i];
152 zdev->start_dma = response->sdma;
153 zdev->end_dma = response->edma;
154 zdev->pchid = response->pchid;
155 zdev->pfgid = response->pfgid;
156 zdev->pft = response->pft;
157 zdev->vfn = response->vfn;
158 zdev->uid = response->uid;
159 zdev->fmb_length = sizeof(u32) * response->fmb_len;
161 memcpy(zdev->pfip, response->pfip, sizeof(zdev->pfip));
162 if (response->util_str_avail) {
163 memcpy(zdev->util_str, response->util_str,
164 sizeof(zdev->util_str));
166 zdev->mio_capable = response->mio_addr_avail;
167 for (i = 0; i < PCI_BAR_COUNT; i++) {
168 if (!(response->mio_valid & (1 << (PCI_BAR_COUNT - i - 1))))
171 zdev->bars[i].mio_wb = (void __iomem *) response->addr[i].wb;
172 zdev->bars[i].mio_wt = (void __iomem *) response->addr[i].wt;
177 static int clp_query_pci_fn(struct zpci_dev *zdev, u32 fh)
179 struct clp_req_rsp_query_pci *rrb;
182 rrb = clp_alloc_block(GFP_KERNEL);
186 memset(rrb, 0, sizeof(*rrb));
187 rrb->request.hdr.len = sizeof(rrb->request);
188 rrb->request.hdr.cmd = CLP_QUERY_PCI_FN;
189 rrb->response.hdr.len = sizeof(rrb->response);
190 rrb->request.fh = fh;
192 rc = clp_req(rrb, CLP_LPS_PCI);
193 if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
194 rc = clp_store_query_pci_fn(zdev, &rrb->response);
197 rc = clp_query_pci_fngrp(zdev, rrb->response.pfgid);
199 zpci_err("Q PCI FN:\n");
200 zpci_err_clp(rrb->response.hdr.rsp, rc);
208 int clp_add_pci_device(u32 fid, u32 fh, int configured)
210 struct zpci_dev *zdev;
213 zpci_dbg(3, "add fid:%x, fh:%x, c:%d\n", fid, fh, configured);
214 zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
221 /* Query function properties and update zdev */
222 rc = clp_query_pci_fn(zdev, fh);
227 zdev->state = ZPCI_FN_STATE_CONFIGURED;
229 zdev->state = ZPCI_FN_STATE_STANDBY;
231 rc = zpci_create_device(zdev);
237 zpci_dbg(0, "add fid:%x, rc:%d\n", fid, rc);
243 * Enable/Disable a given PCI function defined by its function handle.
245 static int clp_set_pci_fn(u32 *fh, u8 nr_dma_as, u8 command)
247 struct clp_req_rsp_set_pci *rrb;
248 int rc, retries = 100;
250 rrb = clp_alloc_block(GFP_KERNEL);
255 memset(rrb, 0, sizeof(*rrb));
256 rrb->request.hdr.len = sizeof(rrb->request);
257 rrb->request.hdr.cmd = CLP_SET_PCI_FN;
258 rrb->response.hdr.len = sizeof(rrb->response);
259 rrb->request.fh = *fh;
260 rrb->request.oc = command;
261 rrb->request.ndas = nr_dma_as;
263 rc = clp_req(rrb, CLP_LPS_PCI);
264 if (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY) {
270 } while (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY);
272 if (!rc && rrb->response.hdr.rsp == CLP_RC_OK)
273 *fh = rrb->response.fh;
275 zpci_err("Set PCI FN:\n");
276 zpci_err_clp(rrb->response.hdr.rsp, rc);
283 int clp_enable_fh(struct zpci_dev *zdev, u8 nr_dma_as)
288 rc = clp_set_pci_fn(&fh, nr_dma_as, CLP_SET_ENABLE_PCI_FN);
289 zpci_dbg(3, "ena fid:%x, fh:%x, rc:%d\n", zdev->fid, fh, rc);
294 if (zdev->mio_capable) {
295 rc = clp_set_pci_fn(&fh, nr_dma_as, CLP_SET_ENABLE_MIO);
296 zpci_dbg(3, "ena mio fid:%x, fh:%x, rc:%d\n", zdev->fid, fh, rc);
298 clp_disable_fh(zdev);
304 int clp_disable_fh(struct zpci_dev *zdev)
309 if (!zdev_enabled(zdev))
312 rc = clp_set_pci_fn(&fh, 0, CLP_SET_DISABLE_PCI_FN);
313 zpci_dbg(3, "dis fid:%x, fh:%x, rc:%d\n", zdev->fid, fh, rc);
320 static int clp_list_pci(struct clp_req_rsp_list_pci *rrb, void *data,
321 void (*cb)(struct clp_fh_list_entry *, void *))
323 u64 resume_token = 0;
327 memset(rrb, 0, sizeof(*rrb));
328 rrb->request.hdr.len = sizeof(rrb->request);
329 rrb->request.hdr.cmd = CLP_LIST_PCI;
330 /* store as many entries as possible */
331 rrb->response.hdr.len = CLP_BLK_SIZE - LIST_PCI_HDR_LEN;
332 rrb->request.resume_token = resume_token;
334 /* Get PCI function handle list */
335 rc = clp_req(rrb, CLP_LPS_PCI);
336 if (rc || rrb->response.hdr.rsp != CLP_RC_OK) {
337 zpci_err("List PCI FN:\n");
338 zpci_err_clp(rrb->response.hdr.rsp, rc);
343 update_uid_checking(rrb->response.uid_checking);
344 WARN_ON_ONCE(rrb->response.entry_size !=
345 sizeof(struct clp_fh_list_entry));
347 entries = (rrb->response.hdr.len - LIST_PCI_HDR_LEN) /
348 rrb->response.entry_size;
350 resume_token = rrb->response.resume_token;
351 for (i = 0; i < entries; i++)
352 cb(&rrb->response.fh_list[i], data);
353 } while (resume_token);
358 static void __clp_add(struct clp_fh_list_entry *entry, void *data)
360 struct zpci_dev *zdev;
362 if (!entry->vendor_id)
365 zdev = get_zdev_by_fid(entry->fid);
367 clp_add_pci_device(entry->fid, entry->fh, entry->config_state);
370 static void __clp_update(struct clp_fh_list_entry *entry, void *data)
372 struct zpci_dev *zdev;
374 if (!entry->vendor_id)
377 zdev = get_zdev_by_fid(entry->fid);
381 zdev->fh = entry->fh;
384 int clp_scan_pci_devices(void)
386 struct clp_req_rsp_list_pci *rrb;
389 rrb = clp_alloc_block(GFP_KERNEL);
393 rc = clp_list_pci(rrb, NULL, __clp_add);
399 int clp_rescan_pci_devices(void)
401 struct clp_req_rsp_list_pci *rrb;
404 zpci_remove_reserved_devices();
406 rrb = clp_alloc_block(GFP_KERNEL);
410 rc = clp_list_pci(rrb, NULL, __clp_add);
416 int clp_rescan_pci_devices_simple(void)
418 struct clp_req_rsp_list_pci *rrb;
421 rrb = clp_alloc_block(GFP_NOWAIT);
425 rc = clp_list_pci(rrb, NULL, __clp_update);
431 struct clp_state_data {
433 enum zpci_state state;
436 static void __clp_get_state(struct clp_fh_list_entry *entry, void *data)
438 struct clp_state_data *sd = data;
440 if (entry->fid != sd->fid)
443 sd->state = entry->config_state;
446 int clp_get_state(u32 fid, enum zpci_state *state)
448 struct clp_req_rsp_list_pci *rrb;
449 struct clp_state_data sd = {fid, ZPCI_FN_STATE_RESERVED};
452 rrb = clp_alloc_block(GFP_ATOMIC);
456 rc = clp_list_pci(rrb, &sd, __clp_get_state);
464 static int clp_base_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
466 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
468 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
469 lpcb->response.hdr.len > limit)
471 return clp_req(lpcb, CLP_LPS_BASE) ? -EOPNOTSUPP : 0;
474 static int clp_base_command(struct clp_req *req, struct clp_req_hdr *lpcb)
477 case 0x0001: /* store logical-processor characteristics */
478 return clp_base_slpc(req, (void *) lpcb);
484 static int clp_pci_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
486 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
488 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
489 lpcb->response.hdr.len > limit)
491 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
494 static int clp_pci_list(struct clp_req *req, struct clp_req_rsp_list_pci *lpcb)
496 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
498 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
499 lpcb->response.hdr.len > limit)
501 if (lpcb->request.reserved2 != 0)
503 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
506 static int clp_pci_query(struct clp_req *req,
507 struct clp_req_rsp_query_pci *lpcb)
509 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
511 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
512 lpcb->response.hdr.len > limit)
514 if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0)
516 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
519 static int clp_pci_query_grp(struct clp_req *req,
520 struct clp_req_rsp_query_pci_grp *lpcb)
522 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
524 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
525 lpcb->response.hdr.len > limit)
527 if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0 ||
528 lpcb->request.reserved4 != 0)
530 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
533 static int clp_pci_command(struct clp_req *req, struct clp_req_hdr *lpcb)
536 case 0x0001: /* store logical-processor characteristics */
537 return clp_pci_slpc(req, (void *) lpcb);
538 case 0x0002: /* list PCI functions */
539 return clp_pci_list(req, (void *) lpcb);
540 case 0x0003: /* query PCI function */
541 return clp_pci_query(req, (void *) lpcb);
542 case 0x0004: /* query PCI function group */
543 return clp_pci_query_grp(req, (void *) lpcb);
549 static int clp_normal_command(struct clp_req *req)
551 struct clp_req_hdr *lpcb;
556 if (req->lps != 0 && req->lps != 2)
560 lpcb = clp_alloc_block(GFP_KERNEL);
565 uptr = (void __force __user *)(unsigned long) req->data_p;
566 if (copy_from_user(lpcb, uptr, PAGE_SIZE) != 0)
570 if (lpcb->fmt != 0 || lpcb->reserved1 != 0 || lpcb->reserved2 != 0)
575 rc = clp_base_command(req, lpcb);
578 rc = clp_pci_command(req, lpcb);
585 if (copy_to_user(uptr, lpcb, PAGE_SIZE) != 0)
591 clp_free_block(lpcb);
596 static int clp_immediate_command(struct clp_req *req)
602 if (req->cmd > 1 || clp_get_ilp(&ilp) != 0)
605 uptr = (void __force __user *)(unsigned long) req->data_p;
607 /* Command code 0: test for a specific processor */
608 exists = test_bit_inv(req->lps, &ilp);
609 return put_user(exists, (int __user *) uptr);
611 /* Command code 1: return bit mask of installed processors */
612 return put_user(ilp, (unsigned long __user *) uptr);
615 static long clp_misc_ioctl(struct file *filp, unsigned int cmd,
624 argp = is_compat_task() ? compat_ptr(arg) : (void __user *) arg;
625 if (copy_from_user(&req, argp, sizeof(req)))
629 return req.c ? clp_immediate_command(&req) : clp_normal_command(&req);
632 static int clp_misc_release(struct inode *inode, struct file *filp)
637 static const struct file_operations clp_misc_fops = {
638 .owner = THIS_MODULE,
639 .open = nonseekable_open,
640 .release = clp_misc_release,
641 .unlocked_ioctl = clp_misc_ioctl,
642 .compat_ioctl = clp_misc_ioctl,
646 static struct miscdevice clp_misc_device = {
647 .minor = MISC_DYNAMIC_MINOR,
649 .fops = &clp_misc_fops,
652 static int __init clp_misc_init(void)
654 return misc_register(&clp_misc_device);
657 device_initcall(clp_misc_init);