2 * Copyright IBM Corp. 2012
5 * Jan Glauber <jang@linux.vnet.ibm.com>
8 #define KMSG_COMPONENT "zpci"
9 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
11 #include <linux/compat.h>
12 #include <linux/kernel.h>
13 #include <linux/miscdevice.h>
14 #include <linux/slab.h>
15 #include <linux/err.h>
16 #include <linux/delay.h>
17 #include <linux/pci.h>
18 #include <linux/uaccess.h>
19 #include <asm/pci_debug.h>
20 #include <asm/pci_clp.h>
21 #include <asm/compat.h>
23 #include <uapi/asm/clp.h>
27 static inline void zpci_err_clp(unsigned int rsp, int rc)
32 } __packed data = {rsp, rc};
34 zpci_err_hex(&data, sizeof(data));
38 * Call Logical Processor with c=1, lps=0 and command 1
39 * to get the bit mask of installed logical processors
41 static inline int clp_get_ilp(unsigned long *ilp)
47 " .insn rrf,0xb9a00000,%[mask],%[cmd],8,0\n"
52 : [cc] "+d" (cc), [mask] "=d" (mask) : [cmd] "a" (1)
59 * Call Logical Processor with c=0, the give constant lps and an lpcb request.
61 static inline int clp_req(void *data, unsigned int lps)
63 struct { u8 _[CLP_BLK_SIZE]; } *req = data;
68 " .insn rrf,0xb9a00000,%[ign],%[req],0,%[lps]\n"
73 : [cc] "+d" (cc), [ign] "=d" (ignored), "+m" (*req)
74 : [req] "a" (req), [lps] "i" (lps)
79 static void *clp_alloc_block(gfp_t gfp_mask)
81 return (void *) __get_free_pages(gfp_mask, get_order(CLP_BLK_SIZE));
84 static void clp_free_block(void *ptr)
86 free_pages((unsigned long) ptr, get_order(CLP_BLK_SIZE));
89 static void clp_store_query_pci_fngrp(struct zpci_dev *zdev,
90 struct clp_rsp_query_pci_grp *response)
92 zdev->tlb_refresh = response->refresh;
93 zdev->dma_mask = response->dasm;
94 zdev->msi_addr = response->msia;
95 zdev->max_msi = response->noi;
96 zdev->fmb_update = response->mui;
98 switch (response->version) {
100 zdev->max_bus_speed = PCIE_SPEED_5_0GT;
103 zdev->max_bus_speed = PCI_SPEED_UNKNOWN;
108 static int clp_query_pci_fngrp(struct zpci_dev *zdev, u8 pfgid)
110 struct clp_req_rsp_query_pci_grp *rrb;
113 rrb = clp_alloc_block(GFP_KERNEL);
117 memset(rrb, 0, sizeof(*rrb));
118 rrb->request.hdr.len = sizeof(rrb->request);
119 rrb->request.hdr.cmd = CLP_QUERY_PCI_FNGRP;
120 rrb->response.hdr.len = sizeof(rrb->response);
121 rrb->request.pfgid = pfgid;
123 rc = clp_req(rrb, CLP_LPS_PCI);
124 if (!rc && rrb->response.hdr.rsp == CLP_RC_OK)
125 clp_store_query_pci_fngrp(zdev, &rrb->response);
127 zpci_err("Q PCI FGRP:\n");
128 zpci_err_clp(rrb->response.hdr.rsp, rc);
135 static int clp_store_query_pci_fn(struct zpci_dev *zdev,
136 struct clp_rsp_query_pci *response)
140 for (i = 0; i < PCI_BAR_COUNT; i++) {
141 zdev->bars[i].val = le32_to_cpu(response->bar[i]);
142 zdev->bars[i].size = response->bar_size[i];
144 zdev->start_dma = response->sdma;
145 zdev->end_dma = response->edma;
146 zdev->pchid = response->pchid;
147 zdev->pfgid = response->pfgid;
148 zdev->pft = response->pft;
149 zdev->vfn = response->vfn;
150 zdev->uid = response->uid;
152 memcpy(zdev->pfip, response->pfip, sizeof(zdev->pfip));
153 if (response->util_str_avail) {
154 memcpy(zdev->util_str, response->util_str,
155 sizeof(zdev->util_str));
161 static int clp_query_pci_fn(struct zpci_dev *zdev, u32 fh)
163 struct clp_req_rsp_query_pci *rrb;
166 rrb = clp_alloc_block(GFP_KERNEL);
170 memset(rrb, 0, sizeof(*rrb));
171 rrb->request.hdr.len = sizeof(rrb->request);
172 rrb->request.hdr.cmd = CLP_QUERY_PCI_FN;
173 rrb->response.hdr.len = sizeof(rrb->response);
174 rrb->request.fh = fh;
176 rc = clp_req(rrb, CLP_LPS_PCI);
177 if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
178 rc = clp_store_query_pci_fn(zdev, &rrb->response);
181 rc = clp_query_pci_fngrp(zdev, rrb->response.pfgid);
183 zpci_err("Q PCI FN:\n");
184 zpci_err_clp(rrb->response.hdr.rsp, rc);
192 int clp_add_pci_device(u32 fid, u32 fh, int configured)
194 struct zpci_dev *zdev;
197 zpci_dbg(3, "add fid:%x, fh:%x, c:%d\n", fid, fh, configured);
198 zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
205 /* Query function properties and update zdev */
206 rc = clp_query_pci_fn(zdev, fh);
211 zdev->state = ZPCI_FN_STATE_CONFIGURED;
213 zdev->state = ZPCI_FN_STATE_STANDBY;
215 rc = zpci_create_device(zdev);
226 * Enable/Disable a given PCI function defined by its function handle.
228 static int clp_set_pci_fn(u32 *fh, u8 nr_dma_as, u8 command)
230 struct clp_req_rsp_set_pci *rrb;
231 int rc, retries = 100;
233 rrb = clp_alloc_block(GFP_KERNEL);
238 memset(rrb, 0, sizeof(*rrb));
239 rrb->request.hdr.len = sizeof(rrb->request);
240 rrb->request.hdr.cmd = CLP_SET_PCI_FN;
241 rrb->response.hdr.len = sizeof(rrb->response);
242 rrb->request.fh = *fh;
243 rrb->request.oc = command;
244 rrb->request.ndas = nr_dma_as;
246 rc = clp_req(rrb, CLP_LPS_PCI);
247 if (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY) {
253 } while (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY);
255 if (!rc && rrb->response.hdr.rsp == CLP_RC_OK)
256 *fh = rrb->response.fh;
258 zpci_err("Set PCI FN:\n");
259 zpci_err_clp(rrb->response.hdr.rsp, rc);
266 int clp_enable_fh(struct zpci_dev *zdev, u8 nr_dma_as)
271 rc = clp_set_pci_fn(&fh, nr_dma_as, CLP_SET_ENABLE_PCI_FN);
273 /* Success -> store enabled handle in zdev */
276 zpci_dbg(3, "ena fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
280 int clp_disable_fh(struct zpci_dev *zdev)
285 if (!zdev_enabled(zdev))
288 rc = clp_set_pci_fn(&fh, 0, CLP_SET_DISABLE_PCI_FN);
290 /* Success -> store disabled handle in zdev */
293 zpci_dbg(3, "dis fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
297 static int clp_list_pci(struct clp_req_rsp_list_pci *rrb,
298 void (*cb)(struct clp_fh_list_entry *entry))
300 u64 resume_token = 0;
304 memset(rrb, 0, sizeof(*rrb));
305 rrb->request.hdr.len = sizeof(rrb->request);
306 rrb->request.hdr.cmd = CLP_LIST_PCI;
307 /* store as many entries as possible */
308 rrb->response.hdr.len = CLP_BLK_SIZE - LIST_PCI_HDR_LEN;
309 rrb->request.resume_token = resume_token;
311 /* Get PCI function handle list */
312 rc = clp_req(rrb, CLP_LPS_PCI);
313 if (rc || rrb->response.hdr.rsp != CLP_RC_OK) {
314 zpci_err("List PCI FN:\n");
315 zpci_err_clp(rrb->response.hdr.rsp, rc);
320 zpci_unique_uid = rrb->response.uid_checking;
321 WARN_ON_ONCE(rrb->response.entry_size !=
322 sizeof(struct clp_fh_list_entry));
324 entries = (rrb->response.hdr.len - LIST_PCI_HDR_LEN) /
325 rrb->response.entry_size;
327 resume_token = rrb->response.resume_token;
328 for (i = 0; i < entries; i++)
329 cb(&rrb->response.fh_list[i]);
330 } while (resume_token);
335 static void __clp_add(struct clp_fh_list_entry *entry)
337 if (!entry->vendor_id)
340 clp_add_pci_device(entry->fid, entry->fh, entry->config_state);
343 static void __clp_rescan(struct clp_fh_list_entry *entry)
345 struct zpci_dev *zdev;
347 if (!entry->vendor_id)
350 zdev = get_zdev_by_fid(entry->fid);
352 clp_add_pci_device(entry->fid, entry->fh, entry->config_state);
356 if (!entry->config_state) {
358 * The handle is already disabled, that means no iota/irq freeing via
359 * the firmware interfaces anymore. Need to free resources manually
360 * (DMA memory, debug, sysfs)...
362 zpci_stop_device(zdev);
366 static void __clp_update(struct clp_fh_list_entry *entry)
368 struct zpci_dev *zdev;
370 if (!entry->vendor_id)
373 zdev = get_zdev_by_fid(entry->fid);
377 zdev->fh = entry->fh;
380 int clp_scan_pci_devices(void)
382 struct clp_req_rsp_list_pci *rrb;
385 rrb = clp_alloc_block(GFP_KERNEL);
389 rc = clp_list_pci(rrb, __clp_add);
395 int clp_rescan_pci_devices(void)
397 struct clp_req_rsp_list_pci *rrb;
400 rrb = clp_alloc_block(GFP_KERNEL);
404 rc = clp_list_pci(rrb, __clp_rescan);
410 int clp_rescan_pci_devices_simple(void)
412 struct clp_req_rsp_list_pci *rrb;
415 rrb = clp_alloc_block(GFP_NOWAIT);
419 rc = clp_list_pci(rrb, __clp_update);
425 static int clp_base_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
427 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
429 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
430 lpcb->response.hdr.len > limit)
432 return clp_req(lpcb, CLP_LPS_BASE) ? -EOPNOTSUPP : 0;
435 static int clp_base_command(struct clp_req *req, struct clp_req_hdr *lpcb)
438 case 0x0001: /* store logical-processor characteristics */
439 return clp_base_slpc(req, (void *) lpcb);
445 static int clp_pci_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
447 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
449 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
450 lpcb->response.hdr.len > limit)
452 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
455 static int clp_pci_list(struct clp_req *req, struct clp_req_rsp_list_pci *lpcb)
457 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
459 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
460 lpcb->response.hdr.len > limit)
462 if (lpcb->request.reserved2 != 0)
464 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
467 static int clp_pci_query(struct clp_req *req,
468 struct clp_req_rsp_query_pci *lpcb)
470 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
472 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
473 lpcb->response.hdr.len > limit)
475 if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0)
477 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
480 static int clp_pci_query_grp(struct clp_req *req,
481 struct clp_req_rsp_query_pci_grp *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 || lpcb->request.reserved3 != 0 ||
489 lpcb->request.reserved4 != 0)
491 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
494 static int clp_pci_command(struct clp_req *req, struct clp_req_hdr *lpcb)
497 case 0x0001: /* store logical-processor characteristics */
498 return clp_pci_slpc(req, (void *) lpcb);
499 case 0x0002: /* list PCI functions */
500 return clp_pci_list(req, (void *) lpcb);
501 case 0x0003: /* query PCI function */
502 return clp_pci_query(req, (void *) lpcb);
503 case 0x0004: /* query PCI function group */
504 return clp_pci_query_grp(req, (void *) lpcb);
510 static int clp_normal_command(struct clp_req *req)
512 struct clp_req_hdr *lpcb;
517 if (req->lps != 0 && req->lps != 2)
521 lpcb = clp_alloc_block(GFP_KERNEL);
526 uptr = (void __force __user *)(unsigned long) req->data_p;
527 if (copy_from_user(lpcb, uptr, PAGE_SIZE) != 0)
531 if (lpcb->fmt != 0 || lpcb->reserved1 != 0 || lpcb->reserved2 != 0)
536 rc = clp_base_command(req, lpcb);
539 rc = clp_pci_command(req, lpcb);
546 if (copy_to_user(uptr, lpcb, PAGE_SIZE) != 0)
552 clp_free_block(lpcb);
557 static int clp_immediate_command(struct clp_req *req)
563 if (req->cmd > 1 || clp_get_ilp(&ilp) != 0)
566 uptr = (void __force __user *)(unsigned long) req->data_p;
568 /* Command code 0: test for a specific processor */
569 exists = test_bit_inv(req->lps, &ilp);
570 return put_user(exists, (int __user *) uptr);
572 /* Command code 1: return bit mask of installed processors */
573 return put_user(ilp, (unsigned long __user *) uptr);
576 static long clp_misc_ioctl(struct file *filp, unsigned int cmd,
585 argp = is_compat_task() ? compat_ptr(arg) : (void __user *) arg;
586 if (copy_from_user(&req, argp, sizeof(req)))
590 return req.c ? clp_immediate_command(&req) : clp_normal_command(&req);
593 static int clp_misc_release(struct inode *inode, struct file *filp)
598 static const struct file_operations clp_misc_fops = {
599 .owner = THIS_MODULE,
600 .open = nonseekable_open,
601 .release = clp_misc_release,
602 .unlocked_ioctl = clp_misc_ioctl,
603 .compat_ioctl = clp_misc_ioctl,
607 static struct miscdevice clp_misc_device = {
608 .minor = MISC_DYNAMIC_MINOR,
610 .fops = &clp_misc_fops,
613 static int __init clp_misc_init(void)
615 return misc_register(&clp_misc_device);
618 device_initcall(clp_misc_init);