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 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));
170 static int clp_query_pci_fn(struct zpci_dev *zdev, u32 fh)
172 struct clp_req_rsp_query_pci *rrb;
175 rrb = clp_alloc_block(GFP_KERNEL);
179 memset(rrb, 0, sizeof(*rrb));
180 rrb->request.hdr.len = sizeof(rrb->request);
181 rrb->request.hdr.cmd = CLP_QUERY_PCI_FN;
182 rrb->response.hdr.len = sizeof(rrb->response);
183 rrb->request.fh = fh;
185 rc = clp_req(rrb, CLP_LPS_PCI);
186 if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
187 rc = clp_store_query_pci_fn(zdev, &rrb->response);
190 rc = clp_query_pci_fngrp(zdev, rrb->response.pfgid);
192 zpci_err("Q PCI FN:\n");
193 zpci_err_clp(rrb->response.hdr.rsp, rc);
201 int clp_add_pci_device(u32 fid, u32 fh, int configured)
203 struct zpci_dev *zdev;
206 zpci_dbg(3, "add fid:%x, fh:%x, c:%d\n", fid, fh, configured);
207 zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
214 /* Query function properties and update zdev */
215 rc = clp_query_pci_fn(zdev, fh);
220 zdev->state = ZPCI_FN_STATE_CONFIGURED;
222 zdev->state = ZPCI_FN_STATE_STANDBY;
224 rc = zpci_create_device(zdev);
230 zpci_dbg(0, "add fid:%x, rc:%d\n", fid, rc);
236 * Enable/Disable a given PCI function defined by its function handle.
238 static int clp_set_pci_fn(u32 *fh, u8 nr_dma_as, u8 command)
240 struct clp_req_rsp_set_pci *rrb;
241 int rc, retries = 100;
243 rrb = clp_alloc_block(GFP_KERNEL);
248 memset(rrb, 0, sizeof(*rrb));
249 rrb->request.hdr.len = sizeof(rrb->request);
250 rrb->request.hdr.cmd = CLP_SET_PCI_FN;
251 rrb->response.hdr.len = sizeof(rrb->response);
252 rrb->request.fh = *fh;
253 rrb->request.oc = command;
254 rrb->request.ndas = nr_dma_as;
256 rc = clp_req(rrb, CLP_LPS_PCI);
257 if (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY) {
263 } while (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY);
265 if (!rc && rrb->response.hdr.rsp == CLP_RC_OK)
266 *fh = rrb->response.fh;
268 zpci_err("Set PCI FN:\n");
269 zpci_err_clp(rrb->response.hdr.rsp, rc);
276 int clp_enable_fh(struct zpci_dev *zdev, u8 nr_dma_as)
281 rc = clp_set_pci_fn(&fh, nr_dma_as, CLP_SET_ENABLE_PCI_FN);
283 /* Success -> store enabled handle in zdev */
286 zpci_dbg(3, "ena fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
290 int clp_disable_fh(struct zpci_dev *zdev)
295 if (!zdev_enabled(zdev))
298 rc = clp_set_pci_fn(&fh, 0, CLP_SET_DISABLE_PCI_FN);
300 /* Success -> store disabled handle in zdev */
303 zpci_dbg(3, "dis fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
307 static int clp_list_pci(struct clp_req_rsp_list_pci *rrb, void *data,
308 void (*cb)(struct clp_fh_list_entry *, void *))
310 u64 resume_token = 0;
314 memset(rrb, 0, sizeof(*rrb));
315 rrb->request.hdr.len = sizeof(rrb->request);
316 rrb->request.hdr.cmd = CLP_LIST_PCI;
317 /* store as many entries as possible */
318 rrb->response.hdr.len = CLP_BLK_SIZE - LIST_PCI_HDR_LEN;
319 rrb->request.resume_token = resume_token;
321 /* Get PCI function handle list */
322 rc = clp_req(rrb, CLP_LPS_PCI);
323 if (rc || rrb->response.hdr.rsp != CLP_RC_OK) {
324 zpci_err("List PCI FN:\n");
325 zpci_err_clp(rrb->response.hdr.rsp, rc);
330 update_uid_checking(rrb->response.uid_checking);
331 WARN_ON_ONCE(rrb->response.entry_size !=
332 sizeof(struct clp_fh_list_entry));
334 entries = (rrb->response.hdr.len - LIST_PCI_HDR_LEN) /
335 rrb->response.entry_size;
337 resume_token = rrb->response.resume_token;
338 for (i = 0; i < entries; i++)
339 cb(&rrb->response.fh_list[i], data);
340 } while (resume_token);
345 static void __clp_add(struct clp_fh_list_entry *entry, void *data)
347 struct zpci_dev *zdev;
349 if (!entry->vendor_id)
352 zdev = get_zdev_by_fid(entry->fid);
354 clp_add_pci_device(entry->fid, entry->fh, entry->config_state);
357 static void __clp_update(struct clp_fh_list_entry *entry, void *data)
359 struct zpci_dev *zdev;
361 if (!entry->vendor_id)
364 zdev = get_zdev_by_fid(entry->fid);
368 zdev->fh = entry->fh;
371 int clp_scan_pci_devices(void)
373 struct clp_req_rsp_list_pci *rrb;
376 rrb = clp_alloc_block(GFP_KERNEL);
380 rc = clp_list_pci(rrb, NULL, __clp_add);
386 int clp_rescan_pci_devices(void)
388 struct clp_req_rsp_list_pci *rrb;
391 zpci_remove_reserved_devices();
393 rrb = clp_alloc_block(GFP_KERNEL);
397 rc = clp_list_pci(rrb, NULL, __clp_add);
403 int clp_rescan_pci_devices_simple(void)
405 struct clp_req_rsp_list_pci *rrb;
408 rrb = clp_alloc_block(GFP_NOWAIT);
412 rc = clp_list_pci(rrb, NULL, __clp_update);
418 struct clp_state_data {
420 enum zpci_state state;
423 static void __clp_get_state(struct clp_fh_list_entry *entry, void *data)
425 struct clp_state_data *sd = data;
427 if (entry->fid != sd->fid)
430 sd->state = entry->config_state;
433 int clp_get_state(u32 fid, enum zpci_state *state)
435 struct clp_req_rsp_list_pci *rrb;
436 struct clp_state_data sd = {fid, ZPCI_FN_STATE_RESERVED};
439 rrb = clp_alloc_block(GFP_ATOMIC);
443 rc = clp_list_pci(rrb, &sd, __clp_get_state);
451 static int clp_base_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
453 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
455 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
456 lpcb->response.hdr.len > limit)
458 return clp_req(lpcb, CLP_LPS_BASE) ? -EOPNOTSUPP : 0;
461 static int clp_base_command(struct clp_req *req, struct clp_req_hdr *lpcb)
464 case 0x0001: /* store logical-processor characteristics */
465 return clp_base_slpc(req, (void *) lpcb);
471 static int clp_pci_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
473 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
475 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
476 lpcb->response.hdr.len > limit)
478 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
481 static int clp_pci_list(struct clp_req *req, struct clp_req_rsp_list_pci *lpcb)
483 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
485 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
486 lpcb->response.hdr.len > limit)
488 if (lpcb->request.reserved2 != 0)
490 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
493 static int clp_pci_query(struct clp_req *req,
494 struct clp_req_rsp_query_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 || lpcb->request.reserved3 != 0)
503 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
506 static int clp_pci_query_grp(struct clp_req *req,
507 struct clp_req_rsp_query_pci_grp *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 ||
515 lpcb->request.reserved4 != 0)
517 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
520 static int clp_pci_command(struct clp_req *req, struct clp_req_hdr *lpcb)
523 case 0x0001: /* store logical-processor characteristics */
524 return clp_pci_slpc(req, (void *) lpcb);
525 case 0x0002: /* list PCI functions */
526 return clp_pci_list(req, (void *) lpcb);
527 case 0x0003: /* query PCI function */
528 return clp_pci_query(req, (void *) lpcb);
529 case 0x0004: /* query PCI function group */
530 return clp_pci_query_grp(req, (void *) lpcb);
536 static int clp_normal_command(struct clp_req *req)
538 struct clp_req_hdr *lpcb;
543 if (req->lps != 0 && req->lps != 2)
547 lpcb = clp_alloc_block(GFP_KERNEL);
552 uptr = (void __force __user *)(unsigned long) req->data_p;
553 if (copy_from_user(lpcb, uptr, PAGE_SIZE) != 0)
557 if (lpcb->fmt != 0 || lpcb->reserved1 != 0 || lpcb->reserved2 != 0)
562 rc = clp_base_command(req, lpcb);
565 rc = clp_pci_command(req, lpcb);
572 if (copy_to_user(uptr, lpcb, PAGE_SIZE) != 0)
578 clp_free_block(lpcb);
583 static int clp_immediate_command(struct clp_req *req)
589 if (req->cmd > 1 || clp_get_ilp(&ilp) != 0)
592 uptr = (void __force __user *)(unsigned long) req->data_p;
594 /* Command code 0: test for a specific processor */
595 exists = test_bit_inv(req->lps, &ilp);
596 return put_user(exists, (int __user *) uptr);
598 /* Command code 1: return bit mask of installed processors */
599 return put_user(ilp, (unsigned long __user *) uptr);
602 static long clp_misc_ioctl(struct file *filp, unsigned int cmd,
611 argp = is_compat_task() ? compat_ptr(arg) : (void __user *) arg;
612 if (copy_from_user(&req, argp, sizeof(req)))
616 return req.c ? clp_immediate_command(&req) : clp_normal_command(&req);
619 static int clp_misc_release(struct inode *inode, struct file *filp)
624 static const struct file_operations clp_misc_fops = {
625 .owner = THIS_MODULE,
626 .open = nonseekable_open,
627 .release = clp_misc_release,
628 .unlocked_ioctl = clp_misc_ioctl,
629 .compat_ioctl = clp_misc_ioctl,
633 static struct miscdevice clp_misc_device = {
634 .minor = MISC_DYNAMIC_MINOR,
636 .fops = &clp_misc_fops,
639 static int __init clp_misc_init(void)
641 return misc_register(&clp_misc_device);
644 device_initcall(clp_misc_init);