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12eb4683 FH |
1 | /** |
2 | * IBM Accelerator Family 'GenWQE' | |
3 | * | |
4 | * (C) Copyright IBM Corp. 2013 | |
5 | * | |
6 | * Author: Frank Haverkamp <haver@linux.vnet.ibm.com> | |
7 | * Author: Joerg-Stephan Vogt <jsvogt@de.ibm.com> | |
26d8f6f1 | 8 | * Author: Michael Jung <mijung@gmx.net> |
12eb4683 FH |
9 | * Author: Michael Ruettger <michael@ibmra.de> |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License (version 2 only) | |
13 | * as published by the Free Software Foundation. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | */ | |
20 | ||
21 | /* | |
22 | * Module initialization and PCIe setup. Card health monitoring and | |
23 | * recovery functionality. Character device creation and deletion are | |
24 | * controlled from here. | |
25 | */ | |
26 | ||
27 | #include <linux/module.h> | |
28 | #include <linux/types.h> | |
29 | #include <linux/pci.h> | |
30 | #include <linux/err.h> | |
31 | #include <linux/aer.h> | |
32 | #include <linux/string.h> | |
33 | #include <linux/sched.h> | |
34 | #include <linux/wait.h> | |
35 | #include <linux/delay.h> | |
36 | #include <linux/dma-mapping.h> | |
37 | #include <linux/module.h> | |
38 | #include <linux/notifier.h> | |
39 | #include <linux/device.h> | |
40 | #include <linux/log2.h> | |
12eb4683 FH |
41 | |
42 | #include "card_base.h" | |
43 | #include "card_ddcb.h" | |
44 | ||
45 | MODULE_AUTHOR("Frank Haverkamp <haver@linux.vnet.ibm.com>"); | |
46 | MODULE_AUTHOR("Michael Ruettger <michael@ibmra.de>"); | |
47 | MODULE_AUTHOR("Joerg-Stephan Vogt <jsvogt@de.ibm.com>"); | |
26d8f6f1 | 48 | MODULE_AUTHOR("Michael Jung <mijung@gmx.net>"); |
12eb4683 FH |
49 | |
50 | MODULE_DESCRIPTION("GenWQE Card"); | |
64df2ec5 | 51 | MODULE_VERSION(DRV_VERSION); |
12eb4683 FH |
52 | MODULE_LICENSE("GPL"); |
53 | ||
54 | static char genwqe_driver_name[] = GENWQE_DEVNAME; | |
55 | static struct class *class_genwqe; | |
56 | static struct dentry *debugfs_genwqe; | |
57 | static struct genwqe_dev *genwqe_devices[GENWQE_CARD_NO_MAX]; | |
58 | ||
59 | /* PCI structure for identifying device by PCI vendor and device ID */ | |
32182cd3 | 60 | static const struct pci_device_id genwqe_device_table[] = { |
12eb4683 FH |
61 | { .vendor = PCI_VENDOR_ID_IBM, |
62 | .device = PCI_DEVICE_GENWQE, | |
63 | .subvendor = PCI_SUBVENDOR_ID_IBM, | |
64 | .subdevice = PCI_SUBSYSTEM_ID_GENWQE5, | |
65 | .class = (PCI_CLASSCODE_GENWQE5 << 8), | |
66 | .class_mask = ~0, | |
67 | .driver_data = 0 }, | |
68 | ||
69 | /* Initial SR-IOV bring-up image */ | |
70 | { .vendor = PCI_VENDOR_ID_IBM, | |
71 | .device = PCI_DEVICE_GENWQE, | |
72 | .subvendor = PCI_SUBVENDOR_ID_IBM_SRIOV, | |
73 | .subdevice = PCI_SUBSYSTEM_ID_GENWQE5_SRIOV, | |
74 | .class = (PCI_CLASSCODE_GENWQE5_SRIOV << 8), | |
75 | .class_mask = ~0, | |
76 | .driver_data = 0 }, | |
77 | ||
78 | { .vendor = PCI_VENDOR_ID_IBM, /* VF Vendor ID */ | |
79 | .device = 0x0000, /* VF Device ID */ | |
80 | .subvendor = PCI_SUBVENDOR_ID_IBM_SRIOV, | |
81 | .subdevice = PCI_SUBSYSTEM_ID_GENWQE5_SRIOV, | |
82 | .class = (PCI_CLASSCODE_GENWQE5_SRIOV << 8), | |
83 | .class_mask = ~0, | |
84 | .driver_data = 0 }, | |
85 | ||
86 | /* Fixed up image */ | |
87 | { .vendor = PCI_VENDOR_ID_IBM, | |
88 | .device = PCI_DEVICE_GENWQE, | |
89 | .subvendor = PCI_SUBVENDOR_ID_IBM_SRIOV, | |
90 | .subdevice = PCI_SUBSYSTEM_ID_GENWQE5, | |
91 | .class = (PCI_CLASSCODE_GENWQE5_SRIOV << 8), | |
92 | .class_mask = ~0, | |
93 | .driver_data = 0 }, | |
94 | ||
95 | { .vendor = PCI_VENDOR_ID_IBM, /* VF Vendor ID */ | |
96 | .device = 0x0000, /* VF Device ID */ | |
97 | .subvendor = PCI_SUBVENDOR_ID_IBM_SRIOV, | |
98 | .subdevice = PCI_SUBSYSTEM_ID_GENWQE5, | |
99 | .class = (PCI_CLASSCODE_GENWQE5_SRIOV << 8), | |
100 | .class_mask = ~0, | |
101 | .driver_data = 0 }, | |
102 | ||
103 | /* Even one more ... */ | |
104 | { .vendor = PCI_VENDOR_ID_IBM, | |
105 | .device = PCI_DEVICE_GENWQE, | |
106 | .subvendor = PCI_SUBVENDOR_ID_IBM, | |
107 | .subdevice = PCI_SUBSYSTEM_ID_GENWQE5_NEW, | |
108 | .class = (PCI_CLASSCODE_GENWQE5 << 8), | |
109 | .class_mask = ~0, | |
110 | .driver_data = 0 }, | |
111 | ||
112 | { 0, } /* 0 terminated list. */ | |
113 | }; | |
114 | ||
115 | MODULE_DEVICE_TABLE(pci, genwqe_device_table); | |
116 | ||
117 | /** | |
118 | * genwqe_dev_alloc() - Create and prepare a new card descriptor | |
119 | * | |
120 | * Return: Pointer to card descriptor, or ERR_PTR(err) on error | |
121 | */ | |
122 | static struct genwqe_dev *genwqe_dev_alloc(void) | |
123 | { | |
124 | unsigned int i = 0, j; | |
125 | struct genwqe_dev *cd; | |
126 | ||
127 | for (i = 0; i < GENWQE_CARD_NO_MAX; i++) { | |
128 | if (genwqe_devices[i] == NULL) | |
129 | break; | |
130 | } | |
131 | if (i >= GENWQE_CARD_NO_MAX) | |
132 | return ERR_PTR(-ENODEV); | |
133 | ||
134 | cd = kzalloc(sizeof(struct genwqe_dev), GFP_KERNEL); | |
135 | if (!cd) | |
136 | return ERR_PTR(-ENOMEM); | |
137 | ||
138 | cd->card_idx = i; | |
139 | cd->class_genwqe = class_genwqe; | |
140 | cd->debugfs_genwqe = debugfs_genwqe; | |
141 | ||
fb145456 KSS |
142 | /* |
143 | * This comes from kernel config option and can be overritten via | |
144 | * debugfs. | |
145 | */ | |
146 | cd->use_platform_recovery = CONFIG_GENWQE_PLATFORM_ERROR_RECOVERY; | |
147 | ||
12eb4683 FH |
148 | init_waitqueue_head(&cd->queue_waitq); |
149 | ||
150 | spin_lock_init(&cd->file_lock); | |
151 | INIT_LIST_HEAD(&cd->file_list); | |
152 | ||
153 | cd->card_state = GENWQE_CARD_UNUSED; | |
154 | spin_lock_init(&cd->print_lock); | |
155 | ||
156 | cd->ddcb_software_timeout = genwqe_ddcb_software_timeout; | |
157 | cd->kill_timeout = genwqe_kill_timeout; | |
158 | ||
159 | for (j = 0; j < GENWQE_MAX_VFS; j++) | |
160 | cd->vf_jobtimeout_msec[j] = genwqe_vf_jobtimeout_msec; | |
161 | ||
162 | genwqe_devices[i] = cd; | |
163 | return cd; | |
164 | } | |
165 | ||
166 | static void genwqe_dev_free(struct genwqe_dev *cd) | |
167 | { | |
168 | if (!cd) | |
169 | return; | |
170 | ||
171 | genwqe_devices[cd->card_idx] = NULL; | |
172 | kfree(cd); | |
173 | } | |
174 | ||
175 | /** | |
176 | * genwqe_bus_reset() - Card recovery | |
177 | * | |
178 | * pci_reset_function() will recover the device and ensure that the | |
179 | * registers are accessible again when it completes with success. If | |
180 | * not, the card will stay dead and registers will be unaccessible | |
181 | * still. | |
182 | */ | |
183 | static int genwqe_bus_reset(struct genwqe_dev *cd) | |
184 | { | |
185 | int bars, rc = 0; | |
186 | struct pci_dev *pci_dev = cd->pci_dev; | |
187 | void __iomem *mmio; | |
188 | ||
189 | if (cd->err_inject & GENWQE_INJECT_BUS_RESET_FAILURE) | |
190 | return -EIO; | |
191 | ||
192 | mmio = cd->mmio; | |
193 | cd->mmio = NULL; | |
194 | pci_iounmap(pci_dev, mmio); | |
195 | ||
196 | bars = pci_select_bars(pci_dev, IORESOURCE_MEM); | |
197 | pci_release_selected_regions(pci_dev, bars); | |
198 | ||
199 | /* | |
200 | * Firmware/BIOS might change memory mapping during bus reset. | |
201 | * Settings like enable bus-mastering, ... are backuped and | |
202 | * restored by the pci_reset_function(). | |
203 | */ | |
204 | dev_dbg(&pci_dev->dev, "[%s] pci_reset function ...\n", __func__); | |
205 | rc = pci_reset_function(pci_dev); | |
206 | if (rc) { | |
207 | dev_err(&pci_dev->dev, | |
208 | "[%s] err: failed reset func (rc %d)\n", __func__, rc); | |
209 | return rc; | |
210 | } | |
211 | dev_dbg(&pci_dev->dev, "[%s] done with rc=%d\n", __func__, rc); | |
212 | ||
213 | /* | |
214 | * Here is the right spot to clear the register read | |
215 | * failure. pci_bus_reset() does this job in real systems. | |
216 | */ | |
217 | cd->err_inject &= ~(GENWQE_INJECT_HARDWARE_FAILURE | | |
218 | GENWQE_INJECT_GFIR_FATAL | | |
219 | GENWQE_INJECT_GFIR_INFO); | |
220 | ||
221 | rc = pci_request_selected_regions(pci_dev, bars, genwqe_driver_name); | |
222 | if (rc) { | |
223 | dev_err(&pci_dev->dev, | |
224 | "[%s] err: request bars failed (%d)\n", __func__, rc); | |
225 | return -EIO; | |
226 | } | |
227 | ||
228 | cd->mmio = pci_iomap(pci_dev, 0, 0); | |
229 | if (cd->mmio == NULL) { | |
230 | dev_err(&pci_dev->dev, | |
231 | "[%s] err: mapping BAR0 failed\n", __func__); | |
232 | return -ENOMEM; | |
233 | } | |
234 | return 0; | |
235 | } | |
236 | ||
237 | /* | |
238 | * Hardware circumvention section. Certain bitstreams in our test-lab | |
239 | * had different kinds of problems. Here is where we adjust those | |
240 | * bitstreams to function will with this version of our device driver. | |
241 | * | |
242 | * Thise circumventions are applied to the physical function only. | |
243 | * The magical numbers below are identifying development/manufacturing | |
244 | * versions of the bitstream used on the card. | |
245 | * | |
246 | * Turn off error reporting for old/manufacturing images. | |
247 | */ | |
248 | ||
249 | bool genwqe_need_err_masking(struct genwqe_dev *cd) | |
250 | { | |
251 | return (cd->slu_unitcfg & 0xFFFF0ull) < 0x32170ull; | |
252 | } | |
253 | ||
254 | static void genwqe_tweak_hardware(struct genwqe_dev *cd) | |
255 | { | |
256 | struct pci_dev *pci_dev = cd->pci_dev; | |
257 | ||
258 | /* Mask FIRs for development images */ | |
259 | if (((cd->slu_unitcfg & 0xFFFF0ull) >= 0x32000ull) && | |
260 | ((cd->slu_unitcfg & 0xFFFF0ull) <= 0x33250ull)) { | |
261 | dev_warn(&pci_dev->dev, | |
262 | "FIRs masked due to bitstream %016llx.%016llx\n", | |
263 | cd->slu_unitcfg, cd->app_unitcfg); | |
264 | ||
265 | __genwqe_writeq(cd, IO_APP_SEC_LEM_DEBUG_OVR, | |
266 | 0xFFFFFFFFFFFFFFFFull); | |
267 | ||
268 | __genwqe_writeq(cd, IO_APP_ERR_ACT_MASK, | |
269 | 0x0000000000000000ull); | |
270 | } | |
271 | } | |
272 | ||
273 | /** | |
274 | * genwqe_recovery_on_fatal_gfir_required() - Version depended actions | |
275 | * | |
276 | * Bitstreams older than 2013-02-17 have a bug where fatal GFIRs must | |
277 | * be ignored. This is e.g. true for the bitstream we gave to the card | |
278 | * manufacturer, but also for some old bitstreams we released to our | |
279 | * test-lab. | |
280 | */ | |
281 | int genwqe_recovery_on_fatal_gfir_required(struct genwqe_dev *cd) | |
282 | { | |
283 | return (cd->slu_unitcfg & 0xFFFF0ull) >= 0x32170ull; | |
284 | } | |
285 | ||
286 | int genwqe_flash_readback_fails(struct genwqe_dev *cd) | |
287 | { | |
288 | return (cd->slu_unitcfg & 0xFFFF0ull) < 0x32170ull; | |
289 | } | |
290 | ||
291 | /** | |
292 | * genwqe_T_psec() - Calculate PF/VF timeout register content | |
293 | * | |
294 | * Note: From a design perspective it turned out to be a bad idea to | |
295 | * use codes here to specifiy the frequency/speed values. An old | |
296 | * driver cannot understand new codes and is therefore always a | |
297 | * problem. Better is to measure out the value or put the | |
298 | * speed/frequency directly into a register which is always a valid | |
299 | * value for old as well as for new software. | |
300 | */ | |
301 | /* T = 1/f */ | |
302 | static int genwqe_T_psec(struct genwqe_dev *cd) | |
303 | { | |
304 | u16 speed; /* 1/f -> 250, 200, 166, 175 */ | |
305 | static const int T[] = { 4000, 5000, 6000, 5714 }; | |
306 | ||
307 | speed = (u16)((cd->slu_unitcfg >> 28) & 0x0full); | |
308 | if (speed >= ARRAY_SIZE(T)) | |
309 | return -1; /* illegal value */ | |
310 | ||
311 | return T[speed]; | |
312 | } | |
313 | ||
314 | /** | |
315 | * genwqe_setup_pf_jtimer() - Setup PF hardware timeouts for DDCB execution | |
316 | * | |
317 | * Do this _after_ card_reset() is called. Otherwise the values will | |
318 | * vanish. The settings need to be done when the queues are inactive. | |
319 | * | |
320 | * The max. timeout value is 2^(10+x) * T (6ns for 166MHz) * 15/16. | |
321 | * The min. timeout value is 2^(10+x) * T (6ns for 166MHz) * 14/16. | |
322 | */ | |
323 | static bool genwqe_setup_pf_jtimer(struct genwqe_dev *cd) | |
324 | { | |
325 | u32 T = genwqe_T_psec(cd); | |
326 | u64 x; | |
327 | ||
328 | if (genwqe_pf_jobtimeout_msec == 0) | |
329 | return false; | |
330 | ||
331 | /* PF: large value needed, flash update 2sec per block */ | |
332 | x = ilog2(genwqe_pf_jobtimeout_msec * | |
333 | 16000000000uL/(T * 15)) - 10; | |
334 | ||
335 | genwqe_write_vreg(cd, IO_SLC_VF_APPJOB_TIMEOUT, | |
336 | 0xff00 | (x & 0xff), 0); | |
337 | return true; | |
338 | } | |
339 | ||
340 | /** | |
341 | * genwqe_setup_vf_jtimer() - Setup VF hardware timeouts for DDCB execution | |
342 | */ | |
343 | static bool genwqe_setup_vf_jtimer(struct genwqe_dev *cd) | |
344 | { | |
345 | struct pci_dev *pci_dev = cd->pci_dev; | |
346 | unsigned int vf; | |
347 | u32 T = genwqe_T_psec(cd); | |
348 | u64 x; | |
95a8825c | 349 | int totalvfs; |
12eb4683 | 350 | |
95a8825c FH |
351 | totalvfs = pci_sriov_get_totalvfs(pci_dev); |
352 | if (totalvfs <= 0) | |
353 | return false; | |
354 | ||
355 | for (vf = 0; vf < totalvfs; vf++) { | |
12eb4683 FH |
356 | |
357 | if (cd->vf_jobtimeout_msec[vf] == 0) | |
358 | continue; | |
359 | ||
360 | x = ilog2(cd->vf_jobtimeout_msec[vf] * | |
361 | 16000000000uL/(T * 15)) - 10; | |
362 | ||
363 | genwqe_write_vreg(cd, IO_SLC_VF_APPJOB_TIMEOUT, | |
364 | 0xff00 | (x & 0xff), vf + 1); | |
365 | } | |
366 | return true; | |
367 | } | |
368 | ||
369 | static int genwqe_ffdc_buffs_alloc(struct genwqe_dev *cd) | |
370 | { | |
371 | unsigned int type, e = 0; | |
372 | ||
373 | for (type = 0; type < GENWQE_DBG_UNITS; type++) { | |
374 | switch (type) { | |
375 | case GENWQE_DBG_UNIT0: | |
376 | e = genwqe_ffdc_buff_size(cd, 0); | |
377 | break; | |
378 | case GENWQE_DBG_UNIT1: | |
379 | e = genwqe_ffdc_buff_size(cd, 1); | |
380 | break; | |
381 | case GENWQE_DBG_UNIT2: | |
382 | e = genwqe_ffdc_buff_size(cd, 2); | |
383 | break; | |
384 | case GENWQE_DBG_REGS: | |
385 | e = GENWQE_FFDC_REGS; | |
386 | break; | |
387 | } | |
388 | ||
389 | /* currently support only the debug units mentioned here */ | |
390 | cd->ffdc[type].entries = e; | |
d9c11d45 FH |
391 | cd->ffdc[type].regs = |
392 | kmalloc_array(e, sizeof(struct genwqe_reg), | |
393 | GFP_KERNEL); | |
12eb4683 FH |
394 | /* |
395 | * regs == NULL is ok, the using code treats this as no regs, | |
396 | * Printing warning is ok in this case. | |
397 | */ | |
398 | } | |
399 | return 0; | |
400 | } | |
401 | ||
402 | static void genwqe_ffdc_buffs_free(struct genwqe_dev *cd) | |
403 | { | |
404 | unsigned int type; | |
405 | ||
406 | for (type = 0; type < GENWQE_DBG_UNITS; type++) { | |
407 | kfree(cd->ffdc[type].regs); | |
408 | cd->ffdc[type].regs = NULL; | |
409 | } | |
410 | } | |
411 | ||
412 | static int genwqe_read_ids(struct genwqe_dev *cd) | |
413 | { | |
414 | int err = 0; | |
415 | int slu_id; | |
416 | struct pci_dev *pci_dev = cd->pci_dev; | |
417 | ||
418 | cd->slu_unitcfg = __genwqe_readq(cd, IO_SLU_UNITCFG); | |
419 | if (cd->slu_unitcfg == IO_ILLEGAL_VALUE) { | |
420 | dev_err(&pci_dev->dev, | |
421 | "err: SLUID=%016llx\n", cd->slu_unitcfg); | |
422 | err = -EIO; | |
423 | goto out_err; | |
424 | } | |
425 | ||
426 | slu_id = genwqe_get_slu_id(cd); | |
427 | if (slu_id < GENWQE_SLU_ARCH_REQ || slu_id == 0xff) { | |
428 | dev_err(&pci_dev->dev, | |
429 | "err: incompatible SLU Architecture %u\n", slu_id); | |
430 | err = -ENOENT; | |
431 | goto out_err; | |
432 | } | |
433 | ||
434 | cd->app_unitcfg = __genwqe_readq(cd, IO_APP_UNITCFG); | |
435 | if (cd->app_unitcfg == IO_ILLEGAL_VALUE) { | |
436 | dev_err(&pci_dev->dev, | |
437 | "err: APPID=%016llx\n", cd->app_unitcfg); | |
438 | err = -EIO; | |
439 | goto out_err; | |
440 | } | |
441 | genwqe_read_app_id(cd, cd->app_name, sizeof(cd->app_name)); | |
442 | ||
443 | /* | |
444 | * Is access to all registers possible? If we are a VF the | |
445 | * answer is obvious. If we run fully virtualized, we need to | |
446 | * check if we can access all registers. If we do not have | |
447 | * full access we will cause an UR and some informational FIRs | |
448 | * in the PF, but that should not harm. | |
449 | */ | |
450 | if (pci_dev->is_virtfn) | |
451 | cd->is_privileged = 0; | |
452 | else | |
453 | cd->is_privileged = (__genwqe_readq(cd, IO_SLU_BITSTREAM) | |
454 | != IO_ILLEGAL_VALUE); | |
455 | ||
456 | out_err: | |
457 | return err; | |
458 | } | |
459 | ||
460 | static int genwqe_start(struct genwqe_dev *cd) | |
461 | { | |
462 | int err; | |
463 | struct pci_dev *pci_dev = cd->pci_dev; | |
464 | ||
465 | err = genwqe_read_ids(cd); | |
466 | if (err) | |
467 | return err; | |
468 | ||
469 | if (genwqe_is_privileged(cd)) { | |
470 | /* do this after the tweaks. alloc fail is acceptable */ | |
471 | genwqe_ffdc_buffs_alloc(cd); | |
472 | genwqe_stop_traps(cd); | |
473 | ||
474 | /* Collect registers e.g. FIRs, UNITIDs, traces ... */ | |
475 | genwqe_read_ffdc_regs(cd, cd->ffdc[GENWQE_DBG_REGS].regs, | |
476 | cd->ffdc[GENWQE_DBG_REGS].entries, 0); | |
477 | ||
478 | genwqe_ffdc_buff_read(cd, GENWQE_DBG_UNIT0, | |
479 | cd->ffdc[GENWQE_DBG_UNIT0].regs, | |
480 | cd->ffdc[GENWQE_DBG_UNIT0].entries); | |
481 | ||
482 | genwqe_ffdc_buff_read(cd, GENWQE_DBG_UNIT1, | |
483 | cd->ffdc[GENWQE_DBG_UNIT1].regs, | |
484 | cd->ffdc[GENWQE_DBG_UNIT1].entries); | |
485 | ||
486 | genwqe_ffdc_buff_read(cd, GENWQE_DBG_UNIT2, | |
487 | cd->ffdc[GENWQE_DBG_UNIT2].regs, | |
488 | cd->ffdc[GENWQE_DBG_UNIT2].entries); | |
489 | ||
490 | genwqe_start_traps(cd); | |
491 | ||
492 | if (cd->card_state == GENWQE_CARD_FATAL_ERROR) { | |
493 | dev_warn(&pci_dev->dev, | |
494 | "[%s] chip reload/recovery!\n", __func__); | |
495 | ||
496 | /* | |
497 | * Stealth Mode: Reload chip on either hot | |
498 | * reset or PERST. | |
499 | */ | |
500 | cd->softreset = 0x7Cull; | |
501 | __genwqe_writeq(cd, IO_SLC_CFGREG_SOFTRESET, | |
502 | cd->softreset); | |
503 | ||
504 | err = genwqe_bus_reset(cd); | |
505 | if (err != 0) { | |
506 | dev_err(&pci_dev->dev, | |
507 | "[%s] err: bus reset failed!\n", | |
508 | __func__); | |
509 | goto out; | |
510 | } | |
511 | ||
512 | /* | |
513 | * Re-read the IDs because | |
514 | * it could happen that the bitstream load | |
515 | * failed! | |
516 | */ | |
517 | err = genwqe_read_ids(cd); | |
518 | if (err) | |
519 | goto out; | |
520 | } | |
521 | } | |
522 | ||
523 | err = genwqe_setup_service_layer(cd); /* does a reset to the card */ | |
524 | if (err != 0) { | |
525 | dev_err(&pci_dev->dev, | |
526 | "[%s] err: could not setup servicelayer!\n", __func__); | |
527 | err = -ENODEV; | |
528 | goto out; | |
529 | } | |
530 | ||
531 | if (genwqe_is_privileged(cd)) { /* code is running _after_ reset */ | |
532 | genwqe_tweak_hardware(cd); | |
533 | ||
534 | genwqe_setup_pf_jtimer(cd); | |
535 | genwqe_setup_vf_jtimer(cd); | |
536 | } | |
537 | ||
538 | err = genwqe_device_create(cd); | |
539 | if (err < 0) { | |
540 | dev_err(&pci_dev->dev, | |
541 | "err: chdev init failed! (err=%d)\n", err); | |
542 | goto out_release_service_layer; | |
543 | } | |
544 | return 0; | |
545 | ||
546 | out_release_service_layer: | |
547 | genwqe_release_service_layer(cd); | |
548 | out: | |
549 | if (genwqe_is_privileged(cd)) | |
550 | genwqe_ffdc_buffs_free(cd); | |
551 | return -EIO; | |
552 | } | |
553 | ||
554 | /** | |
555 | * genwqe_stop() - Stop card operation | |
556 | * | |
557 | * Recovery notes: | |
558 | * As long as genwqe_thread runs we might access registers during | |
559 | * error data capture. Same is with the genwqe_health_thread. | |
560 | * When genwqe_bus_reset() fails this function might called two times: | |
561 | * first by the genwqe_health_thread() and later by genwqe_remove() to | |
562 | * unbind the device. We must be able to survive that. | |
563 | * | |
564 | * This function must be robust enough to be called twice. | |
565 | */ | |
566 | static int genwqe_stop(struct genwqe_dev *cd) | |
567 | { | |
568 | genwqe_finish_queue(cd); /* no register access */ | |
569 | genwqe_device_remove(cd); /* device removed, procs killed */ | |
570 | genwqe_release_service_layer(cd); /* here genwqe_thread is stopped */ | |
571 | ||
572 | if (genwqe_is_privileged(cd)) { | |
573 | pci_disable_sriov(cd->pci_dev); /* access pci config space */ | |
574 | genwqe_ffdc_buffs_free(cd); | |
575 | } | |
576 | ||
577 | return 0; | |
578 | } | |
579 | ||
580 | /** | |
581 | * genwqe_recover_card() - Try to recover the card if it is possible | |
582 | * | |
583 | * If fatal_err is set no register access is possible anymore. It is | |
584 | * likely that genwqe_start fails in that situation. Proper error | |
585 | * handling is required in this case. | |
586 | * | |
587 | * genwqe_bus_reset() will cause the pci code to call genwqe_remove() | |
588 | * and later genwqe_probe() for all virtual functions. | |
589 | */ | |
590 | static int genwqe_recover_card(struct genwqe_dev *cd, int fatal_err) | |
591 | { | |
592 | int rc; | |
593 | struct pci_dev *pci_dev = cd->pci_dev; | |
594 | ||
595 | genwqe_stop(cd); | |
596 | ||
597 | /* | |
598 | * Make sure chip is not reloaded to maintain FFDC. Write SLU | |
599 | * Reset Register, CPLDReset field to 0. | |
600 | */ | |
601 | if (!fatal_err) { | |
602 | cd->softreset = 0x70ull; | |
603 | __genwqe_writeq(cd, IO_SLC_CFGREG_SOFTRESET, cd->softreset); | |
604 | } | |
605 | ||
606 | rc = genwqe_bus_reset(cd); | |
607 | if (rc != 0) { | |
608 | dev_err(&pci_dev->dev, | |
609 | "[%s] err: card recovery impossible!\n", __func__); | |
610 | return rc; | |
611 | } | |
612 | ||
613 | rc = genwqe_start(cd); | |
614 | if (rc < 0) { | |
615 | dev_err(&pci_dev->dev, | |
616 | "[%s] err: failed to launch device!\n", __func__); | |
617 | return rc; | |
618 | } | |
619 | return 0; | |
620 | } | |
621 | ||
622 | static int genwqe_health_check_cond(struct genwqe_dev *cd, u64 *gfir) | |
623 | { | |
624 | *gfir = __genwqe_readq(cd, IO_SLC_CFGREG_GFIR); | |
625 | return (*gfir & GFIR_ERR_TRIGGER) && | |
626 | genwqe_recovery_on_fatal_gfir_required(cd); | |
627 | } | |
628 | ||
629 | /** | |
630 | * genwqe_fir_checking() - Check the fault isolation registers of the card | |
631 | * | |
632 | * If this code works ok, can be tried out with help of the genwqe_poke tool: | |
633 | * sudo ./tools/genwqe_poke 0x8 0xfefefefefef | |
634 | * | |
635 | * Now the relevant FIRs/sFIRs should be printed out and the driver should | |
636 | * invoke recovery (devices are removed and readded). | |
637 | */ | |
638 | static u64 genwqe_fir_checking(struct genwqe_dev *cd) | |
639 | { | |
640 | int j, iterations = 0; | |
641 | u64 mask, fir, fec, uid, gfir, gfir_masked, sfir, sfec; | |
642 | u32 fir_addr, fir_clr_addr, fec_addr, sfir_addr, sfec_addr; | |
643 | struct pci_dev *pci_dev = cd->pci_dev; | |
644 | ||
645 | healthMonitor: | |
646 | iterations++; | |
647 | if (iterations > 16) { | |
648 | dev_err(&pci_dev->dev, "* exit looping after %d times\n", | |
649 | iterations); | |
650 | goto fatal_error; | |
651 | } | |
652 | ||
653 | gfir = __genwqe_readq(cd, IO_SLC_CFGREG_GFIR); | |
654 | if (gfir != 0x0) | |
655 | dev_err(&pci_dev->dev, "* 0x%08x 0x%016llx\n", | |
656 | IO_SLC_CFGREG_GFIR, gfir); | |
657 | if (gfir == IO_ILLEGAL_VALUE) | |
658 | goto fatal_error; | |
659 | ||
660 | /* | |
661 | * Avoid printing when to GFIR bit is on prevents contignous | |
662 | * printout e.g. for the following bug: | |
663 | * FIR set without a 2ndary FIR/FIR cannot be cleared | |
664 | * Comment out the following if to get the prints: | |
665 | */ | |
666 | if (gfir == 0) | |
667 | return 0; | |
668 | ||
669 | gfir_masked = gfir & GFIR_ERR_TRIGGER; /* fatal errors */ | |
670 | ||
671 | for (uid = 0; uid < GENWQE_MAX_UNITS; uid++) { /* 0..2 in zEDC */ | |
672 | ||
673 | /* read the primary FIR (pfir) */ | |
674 | fir_addr = (uid << 24) + 0x08; | |
675 | fir = __genwqe_readq(cd, fir_addr); | |
676 | if (fir == 0x0) | |
677 | continue; /* no error in this unit */ | |
678 | ||
679 | dev_err(&pci_dev->dev, "* 0x%08x 0x%016llx\n", fir_addr, fir); | |
680 | if (fir == IO_ILLEGAL_VALUE) | |
681 | goto fatal_error; | |
682 | ||
683 | /* read primary FEC */ | |
684 | fec_addr = (uid << 24) + 0x18; | |
685 | fec = __genwqe_readq(cd, fec_addr); | |
686 | ||
687 | dev_err(&pci_dev->dev, "* 0x%08x 0x%016llx\n", fec_addr, fec); | |
688 | if (fec == IO_ILLEGAL_VALUE) | |
689 | goto fatal_error; | |
690 | ||
691 | for (j = 0, mask = 1ULL; j < 64; j++, mask <<= 1) { | |
692 | ||
693 | /* secondary fir empty, skip it */ | |
694 | if ((fir & mask) == 0x0) | |
695 | continue; | |
696 | ||
697 | sfir_addr = (uid << 24) + 0x100 + 0x08 * j; | |
698 | sfir = __genwqe_readq(cd, sfir_addr); | |
699 | ||
700 | if (sfir == IO_ILLEGAL_VALUE) | |
701 | goto fatal_error; | |
702 | dev_err(&pci_dev->dev, | |
703 | "* 0x%08x 0x%016llx\n", sfir_addr, sfir); | |
704 | ||
705 | sfec_addr = (uid << 24) + 0x300 + 0x08 * j; | |
706 | sfec = __genwqe_readq(cd, sfec_addr); | |
707 | ||
708 | if (sfec == IO_ILLEGAL_VALUE) | |
709 | goto fatal_error; | |
710 | dev_err(&pci_dev->dev, | |
711 | "* 0x%08x 0x%016llx\n", sfec_addr, sfec); | |
712 | ||
713 | gfir = __genwqe_readq(cd, IO_SLC_CFGREG_GFIR); | |
714 | if (gfir == IO_ILLEGAL_VALUE) | |
715 | goto fatal_error; | |
716 | ||
717 | /* gfir turned on during routine! get out and | |
718 | start over. */ | |
719 | if ((gfir_masked == 0x0) && | |
720 | (gfir & GFIR_ERR_TRIGGER)) { | |
721 | goto healthMonitor; | |
722 | } | |
723 | ||
724 | /* do not clear if we entered with a fatal gfir */ | |
725 | if (gfir_masked == 0x0) { | |
726 | ||
727 | /* NEW clear by mask the logged bits */ | |
728 | sfir_addr = (uid << 24) + 0x100 + 0x08 * j; | |
729 | __genwqe_writeq(cd, sfir_addr, sfir); | |
730 | ||
731 | dev_dbg(&pci_dev->dev, | |
d9c11d45 FH |
732 | "[HM] Clearing 2ndary FIR 0x%08x with 0x%016llx\n", |
733 | sfir_addr, sfir); | |
12eb4683 FH |
734 | |
735 | /* | |
736 | * note, these cannot be error-Firs | |
737 | * since gfir_masked is 0 after sfir | |
738 | * was read. Also, it is safe to do | |
739 | * this write if sfir=0. Still need to | |
740 | * clear the primary. This just means | |
741 | * there is no secondary FIR. | |
742 | */ | |
743 | ||
744 | /* clear by mask the logged bit. */ | |
745 | fir_clr_addr = (uid << 24) + 0x10; | |
746 | __genwqe_writeq(cd, fir_clr_addr, mask); | |
747 | ||
748 | dev_dbg(&pci_dev->dev, | |
d9c11d45 FH |
749 | "[HM] Clearing primary FIR 0x%08x with 0x%016llx\n", |
750 | fir_clr_addr, mask); | |
12eb4683 FH |
751 | } |
752 | } | |
753 | } | |
754 | gfir = __genwqe_readq(cd, IO_SLC_CFGREG_GFIR); | |
755 | if (gfir == IO_ILLEGAL_VALUE) | |
756 | goto fatal_error; | |
757 | ||
758 | if ((gfir_masked == 0x0) && (gfir & GFIR_ERR_TRIGGER)) { | |
759 | /* | |
760 | * Check once more that it didn't go on after all the | |
761 | * FIRS were cleared. | |
762 | */ | |
763 | dev_dbg(&pci_dev->dev, "ACK! Another FIR! Recursing %d!\n", | |
764 | iterations); | |
765 | goto healthMonitor; | |
766 | } | |
767 | return gfir_masked; | |
768 | ||
769 | fatal_error: | |
770 | return IO_ILLEGAL_VALUE; | |
771 | } | |
772 | ||
c1f732ad KSS |
773 | /** |
774 | * genwqe_pci_fundamental_reset() - trigger a PCIe fundamental reset on the slot | |
775 | * | |
776 | * Note: pci_set_pcie_reset_state() is not implemented on all archs, so this | |
777 | * reset method will not work in all cases. | |
778 | * | |
779 | * Return: 0 on success or error code from pci_set_pcie_reset_state() | |
780 | */ | |
781 | static int genwqe_pci_fundamental_reset(struct pci_dev *pci_dev) | |
782 | { | |
783 | int rc; | |
784 | ||
785 | /* | |
786 | * lock pci config space access from userspace, | |
787 | * save state and issue PCIe fundamental reset | |
788 | */ | |
789 | pci_cfg_access_lock(pci_dev); | |
790 | pci_save_state(pci_dev); | |
791 | rc = pci_set_pcie_reset_state(pci_dev, pcie_warm_reset); | |
792 | if (!rc) { | |
793 | /* keep PCIe reset asserted for 250ms */ | |
794 | msleep(250); | |
795 | pci_set_pcie_reset_state(pci_dev, pcie_deassert_reset); | |
796 | /* Wait for 2s to reload flash and train the link */ | |
797 | msleep(2000); | |
798 | } | |
799 | pci_restore_state(pci_dev); | |
800 | pci_cfg_access_unlock(pci_dev); | |
801 | return rc; | |
802 | } | |
803 | ||
93b772b2 KSS |
804 | |
805 | static int genwqe_platform_recovery(struct genwqe_dev *cd) | |
806 | { | |
807 | struct pci_dev *pci_dev = cd->pci_dev; | |
808 | int rc; | |
809 | ||
810 | dev_info(&pci_dev->dev, | |
811 | "[%s] resetting card for error recovery\n", __func__); | |
812 | ||
813 | /* Clear out error injection flags */ | |
814 | cd->err_inject &= ~(GENWQE_INJECT_HARDWARE_FAILURE | | |
815 | GENWQE_INJECT_GFIR_FATAL | | |
816 | GENWQE_INJECT_GFIR_INFO); | |
817 | ||
818 | genwqe_stop(cd); | |
819 | ||
820 | /* Try recoverying the card with fundamental reset */ | |
821 | rc = genwqe_pci_fundamental_reset(pci_dev); | |
822 | if (!rc) { | |
823 | rc = genwqe_start(cd); | |
824 | if (!rc) | |
825 | dev_info(&pci_dev->dev, | |
826 | "[%s] card recovered\n", __func__); | |
827 | else | |
828 | dev_err(&pci_dev->dev, | |
829 | "[%s] err: cannot start card services! (err=%d)\n", | |
830 | __func__, rc); | |
831 | } else { | |
832 | dev_err(&pci_dev->dev, | |
833 | "[%s] card reset failed\n", __func__); | |
834 | } | |
835 | ||
836 | return rc; | |
837 | } | |
838 | ||
c1f732ad KSS |
839 | /* |
840 | * genwqe_reload_bistream() - reload card bitstream | |
841 | * | |
842 | * Set the appropriate register and call fundamental reset to reaload the card | |
843 | * bitstream. | |
844 | * | |
845 | * Return: 0 on success, error code otherwise | |
846 | */ | |
847 | static int genwqe_reload_bistream(struct genwqe_dev *cd) | |
848 | { | |
849 | struct pci_dev *pci_dev = cd->pci_dev; | |
850 | int rc; | |
851 | ||
852 | dev_info(&pci_dev->dev, | |
853 | "[%s] resetting card for bitstream reload\n", | |
854 | __func__); | |
855 | ||
856 | genwqe_stop(cd); | |
857 | ||
858 | /* | |
859 | * Cause a CPLD reprogram with the 'next_bitstream' | |
860 | * partition on PCIe hot or fundamental reset | |
861 | */ | |
862 | __genwqe_writeq(cd, IO_SLC_CFGREG_SOFTRESET, | |
863 | (cd->softreset & 0xcull) | 0x70ull); | |
864 | ||
865 | rc = genwqe_pci_fundamental_reset(pci_dev); | |
866 | if (rc) { | |
867 | /* | |
868 | * A fundamental reset failure can be caused | |
869 | * by lack of support on the arch, so we just | |
870 | * log the error and try to start the card | |
871 | * again. | |
872 | */ | |
873 | dev_err(&pci_dev->dev, | |
874 | "[%s] err: failed to reset card for bitstream reload\n", | |
875 | __func__); | |
876 | } | |
877 | ||
878 | rc = genwqe_start(cd); | |
879 | if (rc) { | |
880 | dev_err(&pci_dev->dev, | |
881 | "[%s] err: cannot start card services! (err=%d)\n", | |
882 | __func__, rc); | |
883 | return rc; | |
884 | } | |
885 | dev_info(&pci_dev->dev, | |
886 | "[%s] card reloaded\n", __func__); | |
887 | return 0; | |
888 | } | |
889 | ||
890 | ||
12eb4683 FH |
891 | /** |
892 | * genwqe_health_thread() - Health checking thread | |
893 | * | |
894 | * This thread is only started for the PF of the card. | |
895 | * | |
896 | * This thread monitors the health of the card. A critical situation | |
897 | * is when we read registers which contain -1 (IO_ILLEGAL_VALUE). In | |
898 | * this case we need to be recovered from outside. Writing to | |
899 | * registers will very likely not work either. | |
900 | * | |
901 | * This thread must only exit if kthread_should_stop() becomes true. | |
902 | * | |
903 | * Condition for the health-thread to trigger: | |
904 | * a) when a kthread_stop() request comes in or | |
905 | * b) a critical GFIR occured | |
906 | * | |
907 | * Informational GFIRs are checked and potentially printed in | |
908 | * health_check_interval seconds. | |
909 | */ | |
910 | static int genwqe_health_thread(void *data) | |
911 | { | |
912 | int rc, should_stop = 0; | |
913 | struct genwqe_dev *cd = data; | |
914 | struct pci_dev *pci_dev = cd->pci_dev; | |
915 | u64 gfir, gfir_masked, slu_unitcfg, app_unitcfg; | |
916 | ||
93b772b2 | 917 | health_thread_begin: |
12eb4683 FH |
918 | while (!kthread_should_stop()) { |
919 | rc = wait_event_interruptible_timeout(cd->health_waitq, | |
920 | (genwqe_health_check_cond(cd, &gfir) || | |
921 | (should_stop = kthread_should_stop())), | |
922 | genwqe_health_check_interval * HZ); | |
923 | ||
924 | if (should_stop) | |
925 | break; | |
926 | ||
927 | if (gfir == IO_ILLEGAL_VALUE) { | |
928 | dev_err(&pci_dev->dev, | |
929 | "[%s] GFIR=%016llx\n", __func__, gfir); | |
930 | goto fatal_error; | |
931 | } | |
932 | ||
933 | slu_unitcfg = __genwqe_readq(cd, IO_SLU_UNITCFG); | |
934 | if (slu_unitcfg == IO_ILLEGAL_VALUE) { | |
935 | dev_err(&pci_dev->dev, | |
936 | "[%s] SLU_UNITCFG=%016llx\n", | |
937 | __func__, slu_unitcfg); | |
938 | goto fatal_error; | |
939 | } | |
940 | ||
941 | app_unitcfg = __genwqe_readq(cd, IO_APP_UNITCFG); | |
942 | if (app_unitcfg == IO_ILLEGAL_VALUE) { | |
943 | dev_err(&pci_dev->dev, | |
944 | "[%s] APP_UNITCFG=%016llx\n", | |
945 | __func__, app_unitcfg); | |
946 | goto fatal_error; | |
947 | } | |
948 | ||
949 | gfir = __genwqe_readq(cd, IO_SLC_CFGREG_GFIR); | |
950 | if (gfir == IO_ILLEGAL_VALUE) { | |
951 | dev_err(&pci_dev->dev, | |
952 | "[%s] %s: GFIR=%016llx\n", __func__, | |
953 | (gfir & GFIR_ERR_TRIGGER) ? "err" : "info", | |
954 | gfir); | |
955 | goto fatal_error; | |
956 | } | |
957 | ||
958 | gfir_masked = genwqe_fir_checking(cd); | |
959 | if (gfir_masked == IO_ILLEGAL_VALUE) | |
960 | goto fatal_error; | |
961 | ||
962 | /* | |
963 | * GFIR ErrorTrigger bits set => reset the card! | |
964 | * Never do this for old/manufacturing images! | |
965 | */ | |
966 | if ((gfir_masked) && !cd->skip_recovery && | |
967 | genwqe_recovery_on_fatal_gfir_required(cd)) { | |
968 | ||
969 | cd->card_state = GENWQE_CARD_FATAL_ERROR; | |
970 | ||
971 | rc = genwqe_recover_card(cd, 0); | |
972 | if (rc < 0) { | |
973 | /* FIXME Card is unusable and needs unbind! */ | |
974 | goto fatal_error; | |
975 | } | |
976 | } | |
977 | ||
c1f732ad KSS |
978 | if (cd->card_state == GENWQE_CARD_RELOAD_BITSTREAM) { |
979 | /* Userspace requested card bitstream reload */ | |
980 | rc = genwqe_reload_bistream(cd); | |
981 | if (rc) | |
982 | goto fatal_error; | |
983 | } | |
984 | ||
12eb4683 FH |
985 | cd->last_gfir = gfir; |
986 | cond_resched(); | |
987 | } | |
988 | ||
989 | return 0; | |
990 | ||
991 | fatal_error: | |
fb145456 KSS |
992 | if (cd->use_platform_recovery) { |
993 | /* | |
994 | * Since we use raw accessors, EEH errors won't be detected | |
995 | * by the platform until we do a non-raw MMIO or config space | |
996 | * read | |
997 | */ | |
998 | readq(cd->mmio + IO_SLC_CFGREG_GFIR); | |
999 | ||
1000 | /* We do nothing if the card is going over PCI recovery */ | |
1001 | if (pci_channel_offline(pci_dev)) | |
1002 | return -EIO; | |
93b772b2 KSS |
1003 | |
1004 | /* | |
1005 | * If it's supported by the platform, we try a fundamental reset | |
1006 | * to recover from a fatal error. Otherwise, we continue to wait | |
1007 | * for an external recovery procedure to take care of it. | |
1008 | */ | |
1009 | rc = genwqe_platform_recovery(cd); | |
1010 | if (!rc) | |
1011 | goto health_thread_begin; | |
fb145456 KSS |
1012 | } |
1013 | ||
12eb4683 FH |
1014 | dev_err(&pci_dev->dev, |
1015 | "[%s] card unusable. Please trigger unbind!\n", __func__); | |
1016 | ||
1017 | /* Bring down logical devices to inform user space via udev remove. */ | |
1018 | cd->card_state = GENWQE_CARD_FATAL_ERROR; | |
1019 | genwqe_stop(cd); | |
1020 | ||
1021 | /* genwqe_bus_reset failed(). Now wait for genwqe_remove(). */ | |
1022 | while (!kthread_should_stop()) | |
1023 | cond_resched(); | |
1024 | ||
1025 | return -EIO; | |
1026 | } | |
1027 | ||
1028 | static int genwqe_health_check_start(struct genwqe_dev *cd) | |
1029 | { | |
1030 | int rc; | |
1031 | ||
1032 | if (genwqe_health_check_interval <= 0) | |
1033 | return 0; /* valid for disabling the service */ | |
1034 | ||
1035 | /* moved before request_irq() */ | |
1036 | /* init_waitqueue_head(&cd->health_waitq); */ | |
1037 | ||
1038 | cd->health_thread = kthread_run(genwqe_health_thread, cd, | |
1039 | GENWQE_DEVNAME "%d_health", | |
1040 | cd->card_idx); | |
1041 | if (IS_ERR(cd->health_thread)) { | |
1042 | rc = PTR_ERR(cd->health_thread); | |
1043 | cd->health_thread = NULL; | |
1044 | return rc; | |
1045 | } | |
1046 | return 0; | |
1047 | } | |
1048 | ||
1049 | static int genwqe_health_thread_running(struct genwqe_dev *cd) | |
1050 | { | |
1051 | return cd->health_thread != NULL; | |
1052 | } | |
1053 | ||
1054 | static int genwqe_health_check_stop(struct genwqe_dev *cd) | |
1055 | { | |
1056 | int rc; | |
1057 | ||
1058 | if (!genwqe_health_thread_running(cd)) | |
1059 | return -EIO; | |
1060 | ||
1061 | rc = kthread_stop(cd->health_thread); | |
1062 | cd->health_thread = NULL; | |
1063 | return 0; | |
1064 | } | |
1065 | ||
1066 | /** | |
1067 | * genwqe_pci_setup() - Allocate PCIe related resources for our card | |
1068 | */ | |
1069 | static int genwqe_pci_setup(struct genwqe_dev *cd) | |
1070 | { | |
1071 | int err, bars; | |
1072 | struct pci_dev *pci_dev = cd->pci_dev; | |
1073 | ||
1074 | bars = pci_select_bars(pci_dev, IORESOURCE_MEM); | |
1075 | err = pci_enable_device_mem(pci_dev); | |
1076 | if (err) { | |
1077 | dev_err(&pci_dev->dev, | |
1078 | "err: failed to enable pci memory (err=%d)\n", err); | |
1079 | goto err_out; | |
1080 | } | |
1081 | ||
1082 | /* Reserve PCI I/O and memory resources */ | |
1083 | err = pci_request_selected_regions(pci_dev, bars, genwqe_driver_name); | |
1084 | if (err) { | |
1085 | dev_err(&pci_dev->dev, | |
1086 | "[%s] err: request bars failed (%d)\n", __func__, err); | |
1087 | err = -EIO; | |
1088 | goto err_disable_device; | |
1089 | } | |
1090 | ||
1091 | /* check for 64-bit DMA address supported (DAC) */ | |
1092 | if (!pci_set_dma_mask(pci_dev, DMA_BIT_MASK(64))) { | |
1093 | err = pci_set_consistent_dma_mask(pci_dev, DMA_BIT_MASK(64)); | |
1094 | if (err) { | |
1095 | dev_err(&pci_dev->dev, | |
1096 | "err: DMA64 consistent mask error\n"); | |
1097 | err = -EIO; | |
1098 | goto out_release_resources; | |
1099 | } | |
1100 | /* check for 32-bit DMA address supported (SAC) */ | |
1101 | } else if (!pci_set_dma_mask(pci_dev, DMA_BIT_MASK(32))) { | |
1102 | err = pci_set_consistent_dma_mask(pci_dev, DMA_BIT_MASK(32)); | |
1103 | if (err) { | |
1104 | dev_err(&pci_dev->dev, | |
1105 | "err: DMA32 consistent mask error\n"); | |
1106 | err = -EIO; | |
1107 | goto out_release_resources; | |
1108 | } | |
1109 | } else { | |
1110 | dev_err(&pci_dev->dev, | |
1111 | "err: neither DMA32 nor DMA64 supported\n"); | |
1112 | err = -EIO; | |
1113 | goto out_release_resources; | |
1114 | } | |
1115 | ||
1116 | pci_set_master(pci_dev); | |
1117 | pci_enable_pcie_error_reporting(pci_dev); | |
1118 | ||
fb145456 KSS |
1119 | /* EEH recovery requires PCIe fundamental reset */ |
1120 | pci_dev->needs_freset = 1; | |
1121 | ||
12eb4683 FH |
1122 | /* request complete BAR-0 space (length = 0) */ |
1123 | cd->mmio_len = pci_resource_len(pci_dev, 0); | |
1124 | cd->mmio = pci_iomap(pci_dev, 0, 0); | |
1125 | if (cd->mmio == NULL) { | |
1126 | dev_err(&pci_dev->dev, | |
1127 | "[%s] err: mapping BAR0 failed\n", __func__); | |
1128 | err = -ENOMEM; | |
1129 | goto out_release_resources; | |
1130 | } | |
1131 | ||
1132 | cd->num_vfs = pci_sriov_get_totalvfs(pci_dev); | |
95a8825c FH |
1133 | if (cd->num_vfs < 0) |
1134 | cd->num_vfs = 0; | |
12eb4683 FH |
1135 | |
1136 | err = genwqe_read_ids(cd); | |
1137 | if (err) | |
1138 | goto out_iounmap; | |
1139 | ||
1140 | return 0; | |
1141 | ||
1142 | out_iounmap: | |
1143 | pci_iounmap(pci_dev, cd->mmio); | |
1144 | out_release_resources: | |
1145 | pci_release_selected_regions(pci_dev, bars); | |
1146 | err_disable_device: | |
1147 | pci_disable_device(pci_dev); | |
1148 | err_out: | |
1149 | return err; | |
1150 | } | |
1151 | ||
1152 | /** | |
1153 | * genwqe_pci_remove() - Free PCIe related resources for our card | |
1154 | */ | |
1155 | static void genwqe_pci_remove(struct genwqe_dev *cd) | |
1156 | { | |
1157 | int bars; | |
1158 | struct pci_dev *pci_dev = cd->pci_dev; | |
1159 | ||
1160 | if (cd->mmio) | |
1161 | pci_iounmap(pci_dev, cd->mmio); | |
1162 | ||
1163 | bars = pci_select_bars(pci_dev, IORESOURCE_MEM); | |
1164 | pci_release_selected_regions(pci_dev, bars); | |
1165 | pci_disable_device(pci_dev); | |
1166 | } | |
1167 | ||
1168 | /** | |
1169 | * genwqe_probe() - Device initialization | |
1170 | * @pdev: PCI device information struct | |
1171 | * | |
1172 | * Callable for multiple cards. This function is called on bind. | |
1173 | * | |
1174 | * Return: 0 if succeeded, < 0 when failed | |
1175 | */ | |
1176 | static int genwqe_probe(struct pci_dev *pci_dev, | |
1177 | const struct pci_device_id *id) | |
1178 | { | |
1179 | int err; | |
1180 | struct genwqe_dev *cd; | |
1181 | ||
1182 | genwqe_init_crc32(); | |
1183 | ||
1184 | cd = genwqe_dev_alloc(); | |
1185 | if (IS_ERR(cd)) { | |
1186 | dev_err(&pci_dev->dev, "err: could not alloc mem (err=%d)!\n", | |
1187 | (int)PTR_ERR(cd)); | |
1188 | return PTR_ERR(cd); | |
1189 | } | |
1190 | ||
1191 | dev_set_drvdata(&pci_dev->dev, cd); | |
1192 | cd->pci_dev = pci_dev; | |
1193 | ||
1194 | err = genwqe_pci_setup(cd); | |
1195 | if (err < 0) { | |
1196 | dev_err(&pci_dev->dev, | |
1197 | "err: problems with PCI setup (err=%d)\n", err); | |
1198 | goto out_free_dev; | |
1199 | } | |
1200 | ||
1201 | err = genwqe_start(cd); | |
1202 | if (err < 0) { | |
1203 | dev_err(&pci_dev->dev, | |
1204 | "err: cannot start card services! (err=%d)\n", err); | |
1205 | goto out_pci_remove; | |
1206 | } | |
1207 | ||
1208 | if (genwqe_is_privileged(cd)) { | |
1209 | err = genwqe_health_check_start(cd); | |
1210 | if (err < 0) { | |
1211 | dev_err(&pci_dev->dev, | |
d9c11d45 FH |
1212 | "err: cannot start health checking! (err=%d)\n", |
1213 | err); | |
12eb4683 FH |
1214 | goto out_stop_services; |
1215 | } | |
1216 | } | |
1217 | return 0; | |
1218 | ||
1219 | out_stop_services: | |
1220 | genwqe_stop(cd); | |
1221 | out_pci_remove: | |
1222 | genwqe_pci_remove(cd); | |
1223 | out_free_dev: | |
1224 | genwqe_dev_free(cd); | |
1225 | return err; | |
1226 | } | |
1227 | ||
1228 | /** | |
1229 | * genwqe_remove() - Called when device is removed (hot-plugable) | |
1230 | * | |
1231 | * Or when driver is unloaded respecitively when unbind is done. | |
1232 | */ | |
1233 | static void genwqe_remove(struct pci_dev *pci_dev) | |
1234 | { | |
1235 | struct genwqe_dev *cd = dev_get_drvdata(&pci_dev->dev); | |
1236 | ||
1237 | genwqe_health_check_stop(cd); | |
1238 | ||
1239 | /* | |
1240 | * genwqe_stop() must survive if it is called twice | |
1241 | * sequentially. This happens when the health thread calls it | |
1242 | * and fails on genwqe_bus_reset(). | |
1243 | */ | |
1244 | genwqe_stop(cd); | |
1245 | genwqe_pci_remove(cd); | |
1246 | genwqe_dev_free(cd); | |
1247 | } | |
1248 | ||
1249 | /* | |
1250 | * genwqe_err_error_detected() - Error detection callback | |
1251 | * | |
1252 | * This callback is called by the PCI subsystem whenever a PCI bus | |
1253 | * error is detected. | |
1254 | */ | |
1255 | static pci_ers_result_t genwqe_err_error_detected(struct pci_dev *pci_dev, | |
1256 | enum pci_channel_state state) | |
1257 | { | |
1258 | struct genwqe_dev *cd; | |
1259 | ||
1260 | dev_err(&pci_dev->dev, "[%s] state=%d\n", __func__, state); | |
1261 | ||
12eb4683 FH |
1262 | cd = dev_get_drvdata(&pci_dev->dev); |
1263 | if (cd == NULL) | |
fb145456 | 1264 | return PCI_ERS_RESULT_DISCONNECT; |
12eb4683 | 1265 | |
fb145456 KSS |
1266 | /* Stop the card */ |
1267 | genwqe_health_check_stop(cd); | |
1268 | genwqe_stop(cd); | |
1269 | ||
1270 | /* | |
1271 | * On permanent failure, the PCI code will call device remove | |
1272 | * after the return of this function. | |
1273 | * genwqe_stop() can be called twice. | |
1274 | */ | |
1275 | if (state == pci_channel_io_perm_failure) { | |
12eb4683 | 1276 | return PCI_ERS_RESULT_DISCONNECT; |
fb145456 KSS |
1277 | } else { |
1278 | genwqe_pci_remove(cd); | |
1279 | return PCI_ERS_RESULT_NEED_RESET; | |
12eb4683 | 1280 | } |
fb145456 KSS |
1281 | } |
1282 | ||
1283 | static pci_ers_result_t genwqe_err_slot_reset(struct pci_dev *pci_dev) | |
1284 | { | |
1285 | int rc; | |
1286 | struct genwqe_dev *cd = dev_get_drvdata(&pci_dev->dev); | |
12eb4683 | 1287 | |
fb145456 KSS |
1288 | rc = genwqe_pci_setup(cd); |
1289 | if (!rc) { | |
1290 | return PCI_ERS_RESULT_RECOVERED; | |
1291 | } else { | |
1292 | dev_err(&pci_dev->dev, | |
1293 | "err: problems with PCI setup (err=%d)\n", rc); | |
1294 | return PCI_ERS_RESULT_DISCONNECT; | |
1295 | } | |
12eb4683 FH |
1296 | } |
1297 | ||
1298 | static pci_ers_result_t genwqe_err_result_none(struct pci_dev *dev) | |
1299 | { | |
1300 | return PCI_ERS_RESULT_NONE; | |
1301 | } | |
1302 | ||
fb145456 | 1303 | static void genwqe_err_resume(struct pci_dev *pci_dev) |
12eb4683 | 1304 | { |
fb145456 KSS |
1305 | int rc; |
1306 | struct genwqe_dev *cd = dev_get_drvdata(&pci_dev->dev); | |
1307 | ||
1308 | rc = genwqe_start(cd); | |
1309 | if (!rc) { | |
1310 | rc = genwqe_health_check_start(cd); | |
1311 | if (rc) | |
1312 | dev_err(&pci_dev->dev, | |
1313 | "err: cannot start health checking! (err=%d)\n", | |
1314 | rc); | |
1315 | } else { | |
1316 | dev_err(&pci_dev->dev, | |
1317 | "err: cannot start card services! (err=%d)\n", rc); | |
1318 | } | |
12eb4683 FH |
1319 | } |
1320 | ||
1321 | static int genwqe_sriov_configure(struct pci_dev *dev, int numvfs) | |
1322 | { | |
bc407dd3 | 1323 | int rc; |
12eb4683 FH |
1324 | struct genwqe_dev *cd = dev_get_drvdata(&dev->dev); |
1325 | ||
1326 | if (numvfs > 0) { | |
1327 | genwqe_setup_vf_jtimer(cd); | |
bc407dd3 FH |
1328 | rc = pci_enable_sriov(dev, numvfs); |
1329 | if (rc < 0) | |
1330 | return rc; | |
12eb4683 FH |
1331 | return numvfs; |
1332 | } | |
1333 | if (numvfs == 0) { | |
1334 | pci_disable_sriov(dev); | |
1335 | return 0; | |
1336 | } | |
1337 | return 0; | |
1338 | } | |
1339 | ||
1340 | static struct pci_error_handlers genwqe_err_handler = { | |
1341 | .error_detected = genwqe_err_error_detected, | |
1342 | .mmio_enabled = genwqe_err_result_none, | |
1343 | .link_reset = genwqe_err_result_none, | |
fb145456 | 1344 | .slot_reset = genwqe_err_slot_reset, |
12eb4683 FH |
1345 | .resume = genwqe_err_resume, |
1346 | }; | |
1347 | ||
1348 | static struct pci_driver genwqe_driver = { | |
1349 | .name = genwqe_driver_name, | |
1350 | .id_table = genwqe_device_table, | |
1351 | .probe = genwqe_probe, | |
1352 | .remove = genwqe_remove, | |
1353 | .sriov_configure = genwqe_sriov_configure, | |
1354 | .err_handler = &genwqe_err_handler, | |
1355 | }; | |
1356 | ||
1357 | /** | |
1358 | * genwqe_init_module() - Driver registration and initialization | |
1359 | */ | |
1360 | static int __init genwqe_init_module(void) | |
1361 | { | |
1362 | int rc; | |
1363 | ||
1364 | class_genwqe = class_create(THIS_MODULE, GENWQE_DEVNAME); | |
1365 | if (IS_ERR(class_genwqe)) { | |
1366 | pr_err("[%s] create class failed\n", __func__); | |
1367 | return -ENOMEM; | |
1368 | } | |
1369 | ||
1370 | debugfs_genwqe = debugfs_create_dir(GENWQE_DEVNAME, NULL); | |
1371 | if (!debugfs_genwqe) { | |
1372 | rc = -ENOMEM; | |
1373 | goto err_out; | |
1374 | } | |
1375 | ||
1376 | rc = pci_register_driver(&genwqe_driver); | |
1377 | if (rc != 0) { | |
1378 | pr_err("[%s] pci_reg_driver (rc=%d)\n", __func__, rc); | |
1379 | goto err_out0; | |
1380 | } | |
1381 | ||
1382 | return rc; | |
1383 | ||
1384 | err_out0: | |
1385 | debugfs_remove(debugfs_genwqe); | |
1386 | err_out: | |
1387 | class_destroy(class_genwqe); | |
1388 | return rc; | |
1389 | } | |
1390 | ||
1391 | /** | |
1392 | * genwqe_exit_module() - Driver exit | |
1393 | */ | |
1394 | static void __exit genwqe_exit_module(void) | |
1395 | { | |
1396 | pci_unregister_driver(&genwqe_driver); | |
1397 | debugfs_remove(debugfs_genwqe); | |
1398 | class_destroy(class_genwqe); | |
1399 | } | |
1400 | ||
1401 | module_init(genwqe_init_module); | |
1402 | module_exit(genwqe_exit_module); |