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>
25 static inline void zpci_err_clp(unsigned int rsp, int rc)
30 } __packed data = {rsp, rc};
32 zpci_err_hex(&data, sizeof(data));
36 * Call Logical Processor with c=1, lps=0 and command 1
37 * to get the bit mask of installed logical processors
39 static inline int clp_get_ilp(unsigned long *ilp)
45 " .insn rrf,0xb9a00000,%[mask],%[cmd],8,0\n"
50 : [cc] "+d" (cc), [mask] "=d" (mask) : [cmd] "a" (1)
57 * Call Logical Processor with c=0, the give constant lps and an lpcb request.
59 static inline int clp_req(void *data, unsigned int lps)
61 struct { u8 _[CLP_BLK_SIZE]; } *req = data;
66 " .insn rrf,0xb9a00000,%[ign],%[req],0,%[lps]\n"
71 : [cc] "+d" (cc), [ign] "=d" (ignored), "+m" (*req)
72 : [req] "a" (req), [lps] "i" (lps)
77 static void *clp_alloc_block(gfp_t gfp_mask)
79 return (void *) __get_free_pages(gfp_mask, get_order(CLP_BLK_SIZE));
82 static void clp_free_block(void *ptr)
84 free_pages((unsigned long) ptr, get_order(CLP_BLK_SIZE));
87 static void clp_store_query_pci_fngrp(struct zpci_dev *zdev,
88 struct clp_rsp_query_pci_grp *response)
90 zdev->tlb_refresh = response->refresh;
91 zdev->dma_mask = response->dasm;
92 zdev->msi_addr = response->msia;
93 zdev->max_msi = response->noi;
94 zdev->fmb_update = response->mui;
96 switch (response->version) {
98 zdev->max_bus_speed = PCIE_SPEED_5_0GT;
101 zdev->max_bus_speed = PCI_SPEED_UNKNOWN;
106 static int clp_query_pci_fngrp(struct zpci_dev *zdev, u8 pfgid)
108 struct clp_req_rsp_query_pci_grp *rrb;
111 rrb = clp_alloc_block(GFP_KERNEL);
115 memset(rrb, 0, sizeof(*rrb));
116 rrb->request.hdr.len = sizeof(rrb->request);
117 rrb->request.hdr.cmd = CLP_QUERY_PCI_FNGRP;
118 rrb->response.hdr.len = sizeof(rrb->response);
119 rrb->request.pfgid = pfgid;
121 rc = clp_req(rrb, CLP_LPS_PCI);
122 if (!rc && rrb->response.hdr.rsp == CLP_RC_OK)
123 clp_store_query_pci_fngrp(zdev, &rrb->response);
125 zpci_err("Q PCI FGRP:\n");
126 zpci_err_clp(rrb->response.hdr.rsp, rc);
133 static int clp_store_query_pci_fn(struct zpci_dev *zdev,
134 struct clp_rsp_query_pci *response)
138 for (i = 0; i < PCI_BAR_COUNT; i++) {
139 zdev->bars[i].val = le32_to_cpu(response->bar[i]);
140 zdev->bars[i].size = response->bar_size[i];
142 zdev->start_dma = response->sdma;
143 zdev->end_dma = response->edma;
144 zdev->pchid = response->pchid;
145 zdev->pfgid = response->pfgid;
146 zdev->pft = response->pft;
147 zdev->vfn = response->vfn;
148 zdev->uid = response->uid;
150 memcpy(zdev->pfip, response->pfip, sizeof(zdev->pfip));
151 if (response->util_str_avail) {
152 memcpy(zdev->util_str, response->util_str,
153 sizeof(zdev->util_str));
159 static int clp_query_pci_fn(struct zpci_dev *zdev, u32 fh)
161 struct clp_req_rsp_query_pci *rrb;
164 rrb = clp_alloc_block(GFP_KERNEL);
168 memset(rrb, 0, sizeof(*rrb));
169 rrb->request.hdr.len = sizeof(rrb->request);
170 rrb->request.hdr.cmd = CLP_QUERY_PCI_FN;
171 rrb->response.hdr.len = sizeof(rrb->response);
172 rrb->request.fh = fh;
174 rc = clp_req(rrb, CLP_LPS_PCI);
175 if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
176 rc = clp_store_query_pci_fn(zdev, &rrb->response);
179 rc = clp_query_pci_fngrp(zdev, rrb->response.pfgid);
181 zpci_err("Q PCI FN:\n");
182 zpci_err_clp(rrb->response.hdr.rsp, rc);
190 int clp_add_pci_device(u32 fid, u32 fh, int configured)
192 struct zpci_dev *zdev;
195 zpci_dbg(3, "add fid:%x, fh:%x, c:%d\n", fid, fh, configured);
196 zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
203 /* Query function properties and update zdev */
204 rc = clp_query_pci_fn(zdev, fh);
209 zdev->state = ZPCI_FN_STATE_CONFIGURED;
211 zdev->state = ZPCI_FN_STATE_STANDBY;
213 rc = zpci_create_device(zdev);
224 * Enable/Disable a given PCI function defined by its function handle.
226 static int clp_set_pci_fn(u32 *fh, u8 nr_dma_as, u8 command)
228 struct clp_req_rsp_set_pci *rrb;
229 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 = *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);
264 int clp_enable_fh(struct zpci_dev *zdev, u8 nr_dma_as)
269 rc = clp_set_pci_fn(&fh, nr_dma_as, CLP_SET_ENABLE_PCI_FN);
271 /* Success -> store enabled handle in zdev */
274 zpci_dbg(3, "ena fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
278 int clp_disable_fh(struct zpci_dev *zdev)
283 if (!zdev_enabled(zdev))
286 rc = clp_set_pci_fn(&fh, 0, CLP_SET_DISABLE_PCI_FN);
288 /* Success -> store disabled handle in zdev */
291 zpci_dbg(3, "dis fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
295 static int clp_list_pci(struct clp_req_rsp_list_pci *rrb,
296 void (*cb)(struct clp_fh_list_entry *entry))
298 u64 resume_token = 0;
302 memset(rrb, 0, sizeof(*rrb));
303 rrb->request.hdr.len = sizeof(rrb->request);
304 rrb->request.hdr.cmd = CLP_LIST_PCI;
305 /* store as many entries as possible */
306 rrb->response.hdr.len = CLP_BLK_SIZE - LIST_PCI_HDR_LEN;
307 rrb->request.resume_token = resume_token;
309 /* Get PCI function handle list */
310 rc = clp_req(rrb, CLP_LPS_PCI);
311 if (rc || rrb->response.hdr.rsp != CLP_RC_OK) {
312 zpci_err("List PCI FN:\n");
313 zpci_err_clp(rrb->response.hdr.rsp, rc);
318 WARN_ON_ONCE(rrb->response.entry_size !=
319 sizeof(struct clp_fh_list_entry));
321 entries = (rrb->response.hdr.len - LIST_PCI_HDR_LEN) /
322 rrb->response.entry_size;
324 resume_token = rrb->response.resume_token;
325 for (i = 0; i < entries; i++)
326 cb(&rrb->response.fh_list[i]);
327 } while (resume_token);
332 static void __clp_add(struct clp_fh_list_entry *entry)
334 if (!entry->vendor_id)
337 clp_add_pci_device(entry->fid, entry->fh, entry->config_state);
340 static void __clp_rescan(struct clp_fh_list_entry *entry)
342 struct zpci_dev *zdev;
344 if (!entry->vendor_id)
347 zdev = get_zdev_by_fid(entry->fid);
349 clp_add_pci_device(entry->fid, entry->fh, entry->config_state);
353 if (!entry->config_state) {
355 * The handle is already disabled, that means no iota/irq freeing via
356 * the firmware interfaces anymore. Need to free resources manually
357 * (DMA memory, debug, sysfs)...
359 zpci_stop_device(zdev);
363 static void __clp_update(struct clp_fh_list_entry *entry)
365 struct zpci_dev *zdev;
367 if (!entry->vendor_id)
370 zdev = get_zdev_by_fid(entry->fid);
374 zdev->fh = entry->fh;
377 int clp_scan_pci_devices(void)
379 struct clp_req_rsp_list_pci *rrb;
382 rrb = clp_alloc_block(GFP_KERNEL);
386 rc = clp_list_pci(rrb, __clp_add);
392 int clp_rescan_pci_devices(void)
394 struct clp_req_rsp_list_pci *rrb;
397 rrb = clp_alloc_block(GFP_KERNEL);
401 rc = clp_list_pci(rrb, __clp_rescan);
407 int clp_rescan_pci_devices_simple(void)
409 struct clp_req_rsp_list_pci *rrb;
412 rrb = clp_alloc_block(GFP_NOWAIT);
416 rc = clp_list_pci(rrb, __clp_update);
422 static int clp_base_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
424 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
426 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
427 lpcb->response.hdr.len > limit)
429 return clp_req(lpcb, CLP_LPS_BASE) ? -EOPNOTSUPP : 0;
432 static int clp_base_command(struct clp_req *req, struct clp_req_hdr *lpcb)
435 case 0x0001: /* store logical-processor characteristics */
436 return clp_base_slpc(req, (void *) lpcb);
442 static int clp_pci_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
444 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
446 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
447 lpcb->response.hdr.len > limit)
449 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
452 static int clp_pci_list(struct clp_req *req, struct clp_req_rsp_list_pci *lpcb)
454 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
456 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
457 lpcb->response.hdr.len > limit)
459 if (lpcb->request.reserved2 != 0)
461 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
464 static int clp_pci_query(struct clp_req *req,
465 struct clp_req_rsp_query_pci *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 if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0)
474 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
477 static int clp_pci_query_grp(struct clp_req *req,
478 struct clp_req_rsp_query_pci_grp *lpcb)
480 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
482 if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
483 lpcb->response.hdr.len > limit)
485 if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0 ||
486 lpcb->request.reserved4 != 0)
488 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
491 static int clp_pci_command(struct clp_req *req, struct clp_req_hdr *lpcb)
494 case 0x0001: /* store logical-processor characteristics */
495 return clp_pci_slpc(req, (void *) lpcb);
496 case 0x0002: /* list PCI functions */
497 return clp_pci_list(req, (void *) lpcb);
498 case 0x0003: /* query PCI function */
499 return clp_pci_query(req, (void *) lpcb);
500 case 0x0004: /* query PCI function group */
501 return clp_pci_query_grp(req, (void *) lpcb);
507 static int clp_normal_command(struct clp_req *req)
509 struct clp_req_hdr *lpcb;
514 if (req->lps != 0 && req->lps != 2)
518 lpcb = clp_alloc_block(GFP_KERNEL);
523 uptr = (void __force __user *)(unsigned long) req->data_p;
524 if (copy_from_user(lpcb, uptr, PAGE_SIZE) != 0)
528 if (lpcb->fmt != 0 || lpcb->reserved1 != 0 || lpcb->reserved2 != 0)
533 rc = clp_base_command(req, lpcb);
536 rc = clp_pci_command(req, lpcb);
543 if (copy_to_user(uptr, lpcb, PAGE_SIZE) != 0)
549 clp_free_block(lpcb);
554 static int clp_immediate_command(struct clp_req *req)
560 if (req->cmd > 1 || clp_get_ilp(&ilp) != 0)
563 uptr = (void __force __user *)(unsigned long) req->data_p;
565 /* Command code 0: test for a specific processor */
566 exists = test_bit_inv(req->lps, &ilp);
567 return put_user(exists, (int __user *) uptr);
569 /* Command code 1: return bit mask of installed processors */
570 return put_user(ilp, (unsigned long __user *) uptr);
573 static long clp_misc_ioctl(struct file *filp, unsigned int cmd,
582 argp = is_compat_task() ? compat_ptr(arg) : (void __user *) arg;
583 if (copy_from_user(&req, argp, sizeof(req)))
587 return req.c ? clp_immediate_command(&req) : clp_normal_command(&req);
590 static int clp_misc_release(struct inode *inode, struct file *filp)
595 static const struct file_operations clp_misc_fops = {
596 .owner = THIS_MODULE,
597 .open = nonseekable_open,
598 .release = clp_misc_release,
599 .unlocked_ioctl = clp_misc_ioctl,
600 .compat_ioctl = clp_misc_ioctl,
604 static struct miscdevice clp_misc_device = {
605 .minor = MISC_DYNAMIC_MINOR,
607 .fops = &clp_misc_fops,
610 static int __init clp_misc_init(void)
612 return misc_register(&clp_misc_device);
615 device_initcall(clp_misc_init);