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eb3ae0aa | 1 | // SPDX-License-Identifier: GPL-2.0-only |
12eb4683 FH |
2 | /** |
3 | * IBM Accelerator Family 'GenWQE' | |
4 | * | |
5 | * (C) Copyright IBM Corp. 2013 | |
6 | * | |
7 | * Author: Frank Haverkamp <haver@linux.vnet.ibm.com> | |
8 | * Author: Joerg-Stephan Vogt <jsvogt@de.ibm.com> | |
26d8f6f1 | 9 | * Author: Michael Jung <mijung@gmx.net> |
12eb4683 | 10 | * Author: Michael Ruettger <michael@ibmra.de> |
12eb4683 FH |
11 | */ |
12 | ||
13 | /* | |
14 | * Module initialization and PCIe setup. Card health monitoring and | |
15 | * recovery functionality. Character device creation and deletion are | |
16 | * controlled from here. | |
17 | */ | |
18 | ||
12eb4683 FH |
19 | #include <linux/types.h> |
20 | #include <linux/pci.h> | |
21 | #include <linux/err.h> | |
22 | #include <linux/aer.h> | |
23 | #include <linux/string.h> | |
24 | #include <linux/sched.h> | |
25 | #include <linux/wait.h> | |
26 | #include <linux/delay.h> | |
27 | #include <linux/dma-mapping.h> | |
28 | #include <linux/module.h> | |
29 | #include <linux/notifier.h> | |
30 | #include <linux/device.h> | |
31 | #include <linux/log2.h> | |
12eb4683 FH |
32 | |
33 | #include "card_base.h" | |
34 | #include "card_ddcb.h" | |
35 | ||
36 | MODULE_AUTHOR("Frank Haverkamp <haver@linux.vnet.ibm.com>"); | |
37 | MODULE_AUTHOR("Michael Ruettger <michael@ibmra.de>"); | |
38 | MODULE_AUTHOR("Joerg-Stephan Vogt <jsvogt@de.ibm.com>"); | |
26d8f6f1 | 39 | MODULE_AUTHOR("Michael Jung <mijung@gmx.net>"); |
12eb4683 FH |
40 | |
41 | MODULE_DESCRIPTION("GenWQE Card"); | |
64df2ec5 | 42 | MODULE_VERSION(DRV_VERSION); |
12eb4683 FH |
43 | MODULE_LICENSE("GPL"); |
44 | ||
45 | static char genwqe_driver_name[] = GENWQE_DEVNAME; | |
46 | static struct class *class_genwqe; | |
47 | static struct dentry *debugfs_genwqe; | |
48 | static struct genwqe_dev *genwqe_devices[GENWQE_CARD_NO_MAX]; | |
49 | ||
50 | /* PCI structure for identifying device by PCI vendor and device ID */ | |
32182cd3 | 51 | static const struct pci_device_id genwqe_device_table[] = { |
12eb4683 FH |
52 | { .vendor = PCI_VENDOR_ID_IBM, |
53 | .device = PCI_DEVICE_GENWQE, | |
54 | .subvendor = PCI_SUBVENDOR_ID_IBM, | |
55 | .subdevice = PCI_SUBSYSTEM_ID_GENWQE5, | |
56 | .class = (PCI_CLASSCODE_GENWQE5 << 8), | |
57 | .class_mask = ~0, | |
58 | .driver_data = 0 }, | |
59 | ||
60 | /* Initial SR-IOV bring-up image */ | |
61 | { .vendor = PCI_VENDOR_ID_IBM, | |
62 | .device = PCI_DEVICE_GENWQE, | |
63 | .subvendor = PCI_SUBVENDOR_ID_IBM_SRIOV, | |
64 | .subdevice = PCI_SUBSYSTEM_ID_GENWQE5_SRIOV, | |
65 | .class = (PCI_CLASSCODE_GENWQE5_SRIOV << 8), | |
66 | .class_mask = ~0, | |
67 | .driver_data = 0 }, | |
68 | ||
69 | { .vendor = PCI_VENDOR_ID_IBM, /* VF Vendor ID */ | |
70 | .device = 0x0000, /* VF Device ID */ | |
71 | .subvendor = PCI_SUBVENDOR_ID_IBM_SRIOV, | |
72 | .subdevice = PCI_SUBSYSTEM_ID_GENWQE5_SRIOV, | |
73 | .class = (PCI_CLASSCODE_GENWQE5_SRIOV << 8), | |
74 | .class_mask = ~0, | |
75 | .driver_data = 0 }, | |
76 | ||
77 | /* Fixed up image */ | |
78 | { .vendor = PCI_VENDOR_ID_IBM, | |
79 | .device = PCI_DEVICE_GENWQE, | |
80 | .subvendor = PCI_SUBVENDOR_ID_IBM_SRIOV, | |
81 | .subdevice = PCI_SUBSYSTEM_ID_GENWQE5, | |
82 | .class = (PCI_CLASSCODE_GENWQE5_SRIOV << 8), | |
83 | .class_mask = ~0, | |
84 | .driver_data = 0 }, | |
85 | ||
86 | { .vendor = PCI_VENDOR_ID_IBM, /* VF Vendor ID */ | |
87 | .device = 0x0000, /* VF Device ID */ | |
88 | .subvendor = PCI_SUBVENDOR_ID_IBM_SRIOV, | |
89 | .subdevice = PCI_SUBSYSTEM_ID_GENWQE5, | |
90 | .class = (PCI_CLASSCODE_GENWQE5_SRIOV << 8), | |
91 | .class_mask = ~0, | |
92 | .driver_data = 0 }, | |
93 | ||
94 | /* Even one more ... */ | |
95 | { .vendor = PCI_VENDOR_ID_IBM, | |
96 | .device = PCI_DEVICE_GENWQE, | |
97 | .subvendor = PCI_SUBVENDOR_ID_IBM, | |
98 | .subdevice = PCI_SUBSYSTEM_ID_GENWQE5_NEW, | |
99 | .class = (PCI_CLASSCODE_GENWQE5 << 8), | |
100 | .class_mask = ~0, | |
101 | .driver_data = 0 }, | |
102 | ||
103 | { 0, } /* 0 terminated list. */ | |
104 | }; | |
105 | ||
106 | MODULE_DEVICE_TABLE(pci, genwqe_device_table); | |
107 | ||
108 | /** | |
109 | * genwqe_dev_alloc() - Create and prepare a new card descriptor | |
110 | * | |
111 | * Return: Pointer to card descriptor, or ERR_PTR(err) on error | |
112 | */ | |
113 | static struct genwqe_dev *genwqe_dev_alloc(void) | |
114 | { | |
115 | unsigned int i = 0, j; | |
116 | struct genwqe_dev *cd; | |
117 | ||
118 | for (i = 0; i < GENWQE_CARD_NO_MAX; i++) { | |
119 | if (genwqe_devices[i] == NULL) | |
120 | break; | |
121 | } | |
122 | if (i >= GENWQE_CARD_NO_MAX) | |
123 | return ERR_PTR(-ENODEV); | |
124 | ||
125 | cd = kzalloc(sizeof(struct genwqe_dev), GFP_KERNEL); | |
126 | if (!cd) | |
127 | return ERR_PTR(-ENOMEM); | |
128 | ||
129 | cd->card_idx = i; | |
130 | cd->class_genwqe = class_genwqe; | |
131 | cd->debugfs_genwqe = debugfs_genwqe; | |
132 | ||
fb145456 KSS |
133 | /* |
134 | * This comes from kernel config option and can be overritten via | |
135 | * debugfs. | |
136 | */ | |
137 | cd->use_platform_recovery = CONFIG_GENWQE_PLATFORM_ERROR_RECOVERY; | |
138 | ||
12eb4683 FH |
139 | init_waitqueue_head(&cd->queue_waitq); |
140 | ||
141 | spin_lock_init(&cd->file_lock); | |
142 | INIT_LIST_HEAD(&cd->file_list); | |
143 | ||
144 | cd->card_state = GENWQE_CARD_UNUSED; | |
145 | spin_lock_init(&cd->print_lock); | |
146 | ||
9d14e766 GP |
147 | cd->ddcb_software_timeout = GENWQE_DDCB_SOFTWARE_TIMEOUT; |
148 | cd->kill_timeout = GENWQE_KILL_TIMEOUT; | |
12eb4683 FH |
149 | |
150 | for (j = 0; j < GENWQE_MAX_VFS; j++) | |
9d14e766 | 151 | cd->vf_jobtimeout_msec[j] = GENWQE_VF_JOBTIMEOUT_MSEC; |
12eb4683 FH |
152 | |
153 | genwqe_devices[i] = cd; | |
154 | return cd; | |
155 | } | |
156 | ||
157 | static void genwqe_dev_free(struct genwqe_dev *cd) | |
158 | { | |
159 | if (!cd) | |
160 | return; | |
161 | ||
162 | genwqe_devices[cd->card_idx] = NULL; | |
163 | kfree(cd); | |
164 | } | |
165 | ||
166 | /** | |
167 | * genwqe_bus_reset() - Card recovery | |
a562c0c3 | 168 | * @cd: GenWQE device information |
12eb4683 FH |
169 | * |
170 | * pci_reset_function() will recover the device and ensure that the | |
171 | * registers are accessible again when it completes with success. If | |
172 | * not, the card will stay dead and registers will be unaccessible | |
173 | * still. | |
174 | */ | |
175 | static int genwqe_bus_reset(struct genwqe_dev *cd) | |
176 | { | |
f03774bd | 177 | int rc = 0; |
12eb4683 FH |
178 | struct pci_dev *pci_dev = cd->pci_dev; |
179 | void __iomem *mmio; | |
180 | ||
181 | if (cd->err_inject & GENWQE_INJECT_BUS_RESET_FAILURE) | |
182 | return -EIO; | |
183 | ||
184 | mmio = cd->mmio; | |
185 | cd->mmio = NULL; | |
186 | pci_iounmap(pci_dev, mmio); | |
187 | ||
f03774bd | 188 | pci_release_mem_regions(pci_dev); |
12eb4683 FH |
189 | |
190 | /* | |
191 | * Firmware/BIOS might change memory mapping during bus reset. | |
192 | * Settings like enable bus-mastering, ... are backuped and | |
193 | * restored by the pci_reset_function(). | |
194 | */ | |
195 | dev_dbg(&pci_dev->dev, "[%s] pci_reset function ...\n", __func__); | |
196 | rc = pci_reset_function(pci_dev); | |
197 | if (rc) { | |
198 | dev_err(&pci_dev->dev, | |
199 | "[%s] err: failed reset func (rc %d)\n", __func__, rc); | |
200 | return rc; | |
201 | } | |
202 | dev_dbg(&pci_dev->dev, "[%s] done with rc=%d\n", __func__, rc); | |
203 | ||
204 | /* | |
205 | * Here is the right spot to clear the register read | |
206 | * failure. pci_bus_reset() does this job in real systems. | |
207 | */ | |
208 | cd->err_inject &= ~(GENWQE_INJECT_HARDWARE_FAILURE | | |
209 | GENWQE_INJECT_GFIR_FATAL | | |
210 | GENWQE_INJECT_GFIR_INFO); | |
211 | ||
f03774bd | 212 | rc = pci_request_mem_regions(pci_dev, genwqe_driver_name); |
12eb4683 FH |
213 | if (rc) { |
214 | dev_err(&pci_dev->dev, | |
215 | "[%s] err: request bars failed (%d)\n", __func__, rc); | |
216 | return -EIO; | |
217 | } | |
218 | ||
219 | cd->mmio = pci_iomap(pci_dev, 0, 0); | |
220 | if (cd->mmio == NULL) { | |
221 | dev_err(&pci_dev->dev, | |
222 | "[%s] err: mapping BAR0 failed\n", __func__); | |
223 | return -ENOMEM; | |
224 | } | |
225 | return 0; | |
226 | } | |
227 | ||
228 | /* | |
229 | * Hardware circumvention section. Certain bitstreams in our test-lab | |
230 | * had different kinds of problems. Here is where we adjust those | |
231 | * bitstreams to function will with this version of our device driver. | |
232 | * | |
233 | * Thise circumventions are applied to the physical function only. | |
234 | * The magical numbers below are identifying development/manufacturing | |
235 | * versions of the bitstream used on the card. | |
236 | * | |
237 | * Turn off error reporting for old/manufacturing images. | |
238 | */ | |
239 | ||
240 | bool genwqe_need_err_masking(struct genwqe_dev *cd) | |
241 | { | |
242 | return (cd->slu_unitcfg & 0xFFFF0ull) < 0x32170ull; | |
243 | } | |
244 | ||
245 | static void genwqe_tweak_hardware(struct genwqe_dev *cd) | |
246 | { | |
247 | struct pci_dev *pci_dev = cd->pci_dev; | |
248 | ||
249 | /* Mask FIRs for development images */ | |
250 | if (((cd->slu_unitcfg & 0xFFFF0ull) >= 0x32000ull) && | |
251 | ((cd->slu_unitcfg & 0xFFFF0ull) <= 0x33250ull)) { | |
252 | dev_warn(&pci_dev->dev, | |
253 | "FIRs masked due to bitstream %016llx.%016llx\n", | |
254 | cd->slu_unitcfg, cd->app_unitcfg); | |
255 | ||
256 | __genwqe_writeq(cd, IO_APP_SEC_LEM_DEBUG_OVR, | |
257 | 0xFFFFFFFFFFFFFFFFull); | |
258 | ||
259 | __genwqe_writeq(cd, IO_APP_ERR_ACT_MASK, | |
260 | 0x0000000000000000ull); | |
261 | } | |
262 | } | |
263 | ||
264 | /** | |
265 | * genwqe_recovery_on_fatal_gfir_required() - Version depended actions | |
a562c0c3 | 266 | * @cd: GenWQE device information |
12eb4683 FH |
267 | * |
268 | * Bitstreams older than 2013-02-17 have a bug where fatal GFIRs must | |
269 | * be ignored. This is e.g. true for the bitstream we gave to the card | |
270 | * manufacturer, but also for some old bitstreams we released to our | |
271 | * test-lab. | |
272 | */ | |
273 | int genwqe_recovery_on_fatal_gfir_required(struct genwqe_dev *cd) | |
274 | { | |
275 | return (cd->slu_unitcfg & 0xFFFF0ull) >= 0x32170ull; | |
276 | } | |
277 | ||
278 | int genwqe_flash_readback_fails(struct genwqe_dev *cd) | |
279 | { | |
280 | return (cd->slu_unitcfg & 0xFFFF0ull) < 0x32170ull; | |
281 | } | |
282 | ||
283 | /** | |
284 | * genwqe_T_psec() - Calculate PF/VF timeout register content | |
a562c0c3 | 285 | * @cd: GenWQE device information |
12eb4683 FH |
286 | * |
287 | * Note: From a design perspective it turned out to be a bad idea to | |
288 | * use codes here to specifiy the frequency/speed values. An old | |
289 | * driver cannot understand new codes and is therefore always a | |
290 | * problem. Better is to measure out the value or put the | |
291 | * speed/frequency directly into a register which is always a valid | |
292 | * value for old as well as for new software. | |
293 | */ | |
294 | /* T = 1/f */ | |
295 | static int genwqe_T_psec(struct genwqe_dev *cd) | |
296 | { | |
297 | u16 speed; /* 1/f -> 250, 200, 166, 175 */ | |
298 | static const int T[] = { 4000, 5000, 6000, 5714 }; | |
299 | ||
300 | speed = (u16)((cd->slu_unitcfg >> 28) & 0x0full); | |
301 | if (speed >= ARRAY_SIZE(T)) | |
302 | return -1; /* illegal value */ | |
303 | ||
304 | return T[speed]; | |
305 | } | |
306 | ||
307 | /** | |
308 | * genwqe_setup_pf_jtimer() - Setup PF hardware timeouts for DDCB execution | |
a562c0c3 | 309 | * @cd: GenWQE device information |
12eb4683 FH |
310 | * |
311 | * Do this _after_ card_reset() is called. Otherwise the values will | |
312 | * vanish. The settings need to be done when the queues are inactive. | |
313 | * | |
314 | * The max. timeout value is 2^(10+x) * T (6ns for 166MHz) * 15/16. | |
315 | * The min. timeout value is 2^(10+x) * T (6ns for 166MHz) * 14/16. | |
316 | */ | |
317 | static bool genwqe_setup_pf_jtimer(struct genwqe_dev *cd) | |
318 | { | |
319 | u32 T = genwqe_T_psec(cd); | |
320 | u64 x; | |
321 | ||
9d14e766 | 322 | if (GENWQE_PF_JOBTIMEOUT_MSEC == 0) |
12eb4683 FH |
323 | return false; |
324 | ||
325 | /* PF: large value needed, flash update 2sec per block */ | |
9d14e766 | 326 | x = ilog2(GENWQE_PF_JOBTIMEOUT_MSEC * |
12eb4683 FH |
327 | 16000000000uL/(T * 15)) - 10; |
328 | ||
329 | genwqe_write_vreg(cd, IO_SLC_VF_APPJOB_TIMEOUT, | |
330 | 0xff00 | (x & 0xff), 0); | |
331 | return true; | |
332 | } | |
333 | ||
334 | /** | |
335 | * genwqe_setup_vf_jtimer() - Setup VF hardware timeouts for DDCB execution | |
a562c0c3 | 336 | * @cd: GenWQE device information |
12eb4683 FH |
337 | */ |
338 | static bool genwqe_setup_vf_jtimer(struct genwqe_dev *cd) | |
339 | { | |
340 | struct pci_dev *pci_dev = cd->pci_dev; | |
341 | unsigned int vf; | |
342 | u32 T = genwqe_T_psec(cd); | |
343 | u64 x; | |
95a8825c | 344 | int totalvfs; |
12eb4683 | 345 | |
95a8825c FH |
346 | totalvfs = pci_sriov_get_totalvfs(pci_dev); |
347 | if (totalvfs <= 0) | |
348 | return false; | |
349 | ||
350 | for (vf = 0; vf < totalvfs; vf++) { | |
12eb4683 FH |
351 | |
352 | if (cd->vf_jobtimeout_msec[vf] == 0) | |
353 | continue; | |
354 | ||
355 | x = ilog2(cd->vf_jobtimeout_msec[vf] * | |
356 | 16000000000uL/(T * 15)) - 10; | |
357 | ||
358 | genwqe_write_vreg(cd, IO_SLC_VF_APPJOB_TIMEOUT, | |
359 | 0xff00 | (x & 0xff), vf + 1); | |
360 | } | |
361 | return true; | |
362 | } | |
363 | ||
364 | static int genwqe_ffdc_buffs_alloc(struct genwqe_dev *cd) | |
365 | { | |
366 | unsigned int type, e = 0; | |
367 | ||
368 | for (type = 0; type < GENWQE_DBG_UNITS; type++) { | |
369 | switch (type) { | |
370 | case GENWQE_DBG_UNIT0: | |
371 | e = genwqe_ffdc_buff_size(cd, 0); | |
372 | break; | |
373 | case GENWQE_DBG_UNIT1: | |
374 | e = genwqe_ffdc_buff_size(cd, 1); | |
375 | break; | |
376 | case GENWQE_DBG_UNIT2: | |
377 | e = genwqe_ffdc_buff_size(cd, 2); | |
378 | break; | |
379 | case GENWQE_DBG_REGS: | |
380 | e = GENWQE_FFDC_REGS; | |
381 | break; | |
382 | } | |
383 | ||
384 | /* currently support only the debug units mentioned here */ | |
385 | cd->ffdc[type].entries = e; | |
d9c11d45 FH |
386 | cd->ffdc[type].regs = |
387 | kmalloc_array(e, sizeof(struct genwqe_reg), | |
388 | GFP_KERNEL); | |
12eb4683 FH |
389 | /* |
390 | * regs == NULL is ok, the using code treats this as no regs, | |
391 | * Printing warning is ok in this case. | |
392 | */ | |
393 | } | |
394 | return 0; | |
395 | } | |
396 | ||
397 | static void genwqe_ffdc_buffs_free(struct genwqe_dev *cd) | |
398 | { | |
399 | unsigned int type; | |
400 | ||
401 | for (type = 0; type < GENWQE_DBG_UNITS; type++) { | |
402 | kfree(cd->ffdc[type].regs); | |
403 | cd->ffdc[type].regs = NULL; | |
404 | } | |
405 | } | |
406 | ||
407 | static int genwqe_read_ids(struct genwqe_dev *cd) | |
408 | { | |
409 | int err = 0; | |
410 | int slu_id; | |
411 | struct pci_dev *pci_dev = cd->pci_dev; | |
412 | ||
413 | cd->slu_unitcfg = __genwqe_readq(cd, IO_SLU_UNITCFG); | |
414 | if (cd->slu_unitcfg == IO_ILLEGAL_VALUE) { | |
415 | dev_err(&pci_dev->dev, | |
416 | "err: SLUID=%016llx\n", cd->slu_unitcfg); | |
417 | err = -EIO; | |
418 | goto out_err; | |
419 | } | |
420 | ||
421 | slu_id = genwqe_get_slu_id(cd); | |
422 | if (slu_id < GENWQE_SLU_ARCH_REQ || slu_id == 0xff) { | |
423 | dev_err(&pci_dev->dev, | |
424 | "err: incompatible SLU Architecture %u\n", slu_id); | |
425 | err = -ENOENT; | |
426 | goto out_err; | |
427 | } | |
428 | ||
429 | cd->app_unitcfg = __genwqe_readq(cd, IO_APP_UNITCFG); | |
430 | if (cd->app_unitcfg == IO_ILLEGAL_VALUE) { | |
431 | dev_err(&pci_dev->dev, | |
432 | "err: APPID=%016llx\n", cd->app_unitcfg); | |
433 | err = -EIO; | |
434 | goto out_err; | |
435 | } | |
436 | genwqe_read_app_id(cd, cd->app_name, sizeof(cd->app_name)); | |
437 | ||
438 | /* | |
439 | * Is access to all registers possible? If we are a VF the | |
440 | * answer is obvious. If we run fully virtualized, we need to | |
441 | * check if we can access all registers. If we do not have | |
442 | * full access we will cause an UR and some informational FIRs | |
443 | * in the PF, but that should not harm. | |
444 | */ | |
445 | if (pci_dev->is_virtfn) | |
446 | cd->is_privileged = 0; | |
447 | else | |
448 | cd->is_privileged = (__genwqe_readq(cd, IO_SLU_BITSTREAM) | |
449 | != IO_ILLEGAL_VALUE); | |
450 | ||
451 | out_err: | |
452 | return err; | |
453 | } | |
454 | ||
455 | static int genwqe_start(struct genwqe_dev *cd) | |
456 | { | |
457 | int err; | |
458 | struct pci_dev *pci_dev = cd->pci_dev; | |
459 | ||
460 | err = genwqe_read_ids(cd); | |
461 | if (err) | |
462 | return err; | |
463 | ||
464 | if (genwqe_is_privileged(cd)) { | |
465 | /* do this after the tweaks. alloc fail is acceptable */ | |
466 | genwqe_ffdc_buffs_alloc(cd); | |
467 | genwqe_stop_traps(cd); | |
468 | ||
469 | /* Collect registers e.g. FIRs, UNITIDs, traces ... */ | |
470 | genwqe_read_ffdc_regs(cd, cd->ffdc[GENWQE_DBG_REGS].regs, | |
471 | cd->ffdc[GENWQE_DBG_REGS].entries, 0); | |
472 | ||
473 | genwqe_ffdc_buff_read(cd, GENWQE_DBG_UNIT0, | |
474 | cd->ffdc[GENWQE_DBG_UNIT0].regs, | |
475 | cd->ffdc[GENWQE_DBG_UNIT0].entries); | |
476 | ||
477 | genwqe_ffdc_buff_read(cd, GENWQE_DBG_UNIT1, | |
478 | cd->ffdc[GENWQE_DBG_UNIT1].regs, | |
479 | cd->ffdc[GENWQE_DBG_UNIT1].entries); | |
480 | ||
481 | genwqe_ffdc_buff_read(cd, GENWQE_DBG_UNIT2, | |
482 | cd->ffdc[GENWQE_DBG_UNIT2].regs, | |
483 | cd->ffdc[GENWQE_DBG_UNIT2].entries); | |
484 | ||
485 | genwqe_start_traps(cd); | |
486 | ||
487 | if (cd->card_state == GENWQE_CARD_FATAL_ERROR) { | |
488 | dev_warn(&pci_dev->dev, | |
489 | "[%s] chip reload/recovery!\n", __func__); | |
490 | ||
491 | /* | |
492 | * Stealth Mode: Reload chip on either hot | |
493 | * reset or PERST. | |
494 | */ | |
495 | cd->softreset = 0x7Cull; | |
496 | __genwqe_writeq(cd, IO_SLC_CFGREG_SOFTRESET, | |
497 | cd->softreset); | |
498 | ||
499 | err = genwqe_bus_reset(cd); | |
500 | if (err != 0) { | |
501 | dev_err(&pci_dev->dev, | |
502 | "[%s] err: bus reset failed!\n", | |
503 | __func__); | |
504 | goto out; | |
505 | } | |
506 | ||
507 | /* | |
508 | * Re-read the IDs because | |
509 | * it could happen that the bitstream load | |
510 | * failed! | |
511 | */ | |
512 | err = genwqe_read_ids(cd); | |
513 | if (err) | |
514 | goto out; | |
515 | } | |
516 | } | |
517 | ||
518 | err = genwqe_setup_service_layer(cd); /* does a reset to the card */ | |
519 | if (err != 0) { | |
520 | dev_err(&pci_dev->dev, | |
521 | "[%s] err: could not setup servicelayer!\n", __func__); | |
522 | err = -ENODEV; | |
523 | goto out; | |
524 | } | |
525 | ||
526 | if (genwqe_is_privileged(cd)) { /* code is running _after_ reset */ | |
527 | genwqe_tweak_hardware(cd); | |
528 | ||
529 | genwqe_setup_pf_jtimer(cd); | |
530 | genwqe_setup_vf_jtimer(cd); | |
531 | } | |
532 | ||
533 | err = genwqe_device_create(cd); | |
534 | if (err < 0) { | |
535 | dev_err(&pci_dev->dev, | |
536 | "err: chdev init failed! (err=%d)\n", err); | |
537 | goto out_release_service_layer; | |
538 | } | |
539 | return 0; | |
540 | ||
541 | out_release_service_layer: | |
542 | genwqe_release_service_layer(cd); | |
543 | out: | |
544 | if (genwqe_is_privileged(cd)) | |
545 | genwqe_ffdc_buffs_free(cd); | |
546 | return -EIO; | |
547 | } | |
548 | ||
549 | /** | |
550 | * genwqe_stop() - Stop card operation | |
a562c0c3 | 551 | * @cd: GenWQE device information |
12eb4683 FH |
552 | * |
553 | * Recovery notes: | |
554 | * As long as genwqe_thread runs we might access registers during | |
555 | * error data capture. Same is with the genwqe_health_thread. | |
556 | * When genwqe_bus_reset() fails this function might called two times: | |
557 | * first by the genwqe_health_thread() and later by genwqe_remove() to | |
558 | * unbind the device. We must be able to survive that. | |
559 | * | |
560 | * This function must be robust enough to be called twice. | |
561 | */ | |
562 | static int genwqe_stop(struct genwqe_dev *cd) | |
563 | { | |
564 | genwqe_finish_queue(cd); /* no register access */ | |
565 | genwqe_device_remove(cd); /* device removed, procs killed */ | |
566 | genwqe_release_service_layer(cd); /* here genwqe_thread is stopped */ | |
567 | ||
568 | if (genwqe_is_privileged(cd)) { | |
569 | pci_disable_sriov(cd->pci_dev); /* access pci config space */ | |
570 | genwqe_ffdc_buffs_free(cd); | |
571 | } | |
572 | ||
573 | return 0; | |
574 | } | |
575 | ||
576 | /** | |
577 | * genwqe_recover_card() - Try to recover the card if it is possible | |
f5721c7a LJ |
578 | * @cd: GenWQE device information |
579 | * @fatal_err: Indicate whether to attempt soft reset | |
12eb4683 FH |
580 | * |
581 | * If fatal_err is set no register access is possible anymore. It is | |
582 | * likely that genwqe_start fails in that situation. Proper error | |
583 | * handling is required in this case. | |
584 | * | |
585 | * genwqe_bus_reset() will cause the pci code to call genwqe_remove() | |
586 | * and later genwqe_probe() for all virtual functions. | |
587 | */ | |
588 | static int genwqe_recover_card(struct genwqe_dev *cd, int fatal_err) | |
589 | { | |
590 | int rc; | |
591 | struct pci_dev *pci_dev = cd->pci_dev; | |
592 | ||
593 | genwqe_stop(cd); | |
594 | ||
595 | /* | |
596 | * Make sure chip is not reloaded to maintain FFDC. Write SLU | |
597 | * Reset Register, CPLDReset field to 0. | |
598 | */ | |
599 | if (!fatal_err) { | |
600 | cd->softreset = 0x70ull; | |
601 | __genwqe_writeq(cd, IO_SLC_CFGREG_SOFTRESET, cd->softreset); | |
602 | } | |
603 | ||
604 | rc = genwqe_bus_reset(cd); | |
605 | if (rc != 0) { | |
606 | dev_err(&pci_dev->dev, | |
607 | "[%s] err: card recovery impossible!\n", __func__); | |
608 | return rc; | |
609 | } | |
610 | ||
611 | rc = genwqe_start(cd); | |
612 | if (rc < 0) { | |
613 | dev_err(&pci_dev->dev, | |
614 | "[%s] err: failed to launch device!\n", __func__); | |
615 | return rc; | |
616 | } | |
617 | return 0; | |
618 | } | |
619 | ||
620 | static int genwqe_health_check_cond(struct genwqe_dev *cd, u64 *gfir) | |
621 | { | |
622 | *gfir = __genwqe_readq(cd, IO_SLC_CFGREG_GFIR); | |
623 | return (*gfir & GFIR_ERR_TRIGGER) && | |
624 | genwqe_recovery_on_fatal_gfir_required(cd); | |
625 | } | |
626 | ||
627 | /** | |
628 | * genwqe_fir_checking() - Check the fault isolation registers of the card | |
a562c0c3 | 629 | * @cd: GenWQE device information |
12eb4683 FH |
630 | * |
631 | * If this code works ok, can be tried out with help of the genwqe_poke tool: | |
632 | * sudo ./tools/genwqe_poke 0x8 0xfefefefefef | |
633 | * | |
634 | * Now the relevant FIRs/sFIRs should be printed out and the driver should | |
635 | * invoke recovery (devices are removed and readded). | |
636 | */ | |
637 | static u64 genwqe_fir_checking(struct genwqe_dev *cd) | |
638 | { | |
639 | int j, iterations = 0; | |
640 | u64 mask, fir, fec, uid, gfir, gfir_masked, sfir, sfec; | |
641 | u32 fir_addr, fir_clr_addr, fec_addr, sfir_addr, sfec_addr; | |
642 | struct pci_dev *pci_dev = cd->pci_dev; | |
643 | ||
644 | healthMonitor: | |
645 | iterations++; | |
646 | if (iterations > 16) { | |
647 | dev_err(&pci_dev->dev, "* exit looping after %d times\n", | |
648 | iterations); | |
649 | goto fatal_error; | |
650 | } | |
651 | ||
652 | gfir = __genwqe_readq(cd, IO_SLC_CFGREG_GFIR); | |
653 | if (gfir != 0x0) | |
654 | dev_err(&pci_dev->dev, "* 0x%08x 0x%016llx\n", | |
655 | IO_SLC_CFGREG_GFIR, gfir); | |
656 | if (gfir == IO_ILLEGAL_VALUE) | |
657 | goto fatal_error; | |
658 | ||
659 | /* | |
660 | * Avoid printing when to GFIR bit is on prevents contignous | |
661 | * printout e.g. for the following bug: | |
662 | * FIR set without a 2ndary FIR/FIR cannot be cleared | |
663 | * Comment out the following if to get the prints: | |
664 | */ | |
665 | if (gfir == 0) | |
666 | return 0; | |
667 | ||
668 | gfir_masked = gfir & GFIR_ERR_TRIGGER; /* fatal errors */ | |
669 | ||
670 | for (uid = 0; uid < GENWQE_MAX_UNITS; uid++) { /* 0..2 in zEDC */ | |
671 | ||
672 | /* read the primary FIR (pfir) */ | |
673 | fir_addr = (uid << 24) + 0x08; | |
674 | fir = __genwqe_readq(cd, fir_addr); | |
675 | if (fir == 0x0) | |
676 | continue; /* no error in this unit */ | |
677 | ||
678 | dev_err(&pci_dev->dev, "* 0x%08x 0x%016llx\n", fir_addr, fir); | |
679 | if (fir == IO_ILLEGAL_VALUE) | |
680 | goto fatal_error; | |
681 | ||
682 | /* read primary FEC */ | |
683 | fec_addr = (uid << 24) + 0x18; | |
684 | fec = __genwqe_readq(cd, fec_addr); | |
685 | ||
686 | dev_err(&pci_dev->dev, "* 0x%08x 0x%016llx\n", fec_addr, fec); | |
687 | if (fec == IO_ILLEGAL_VALUE) | |
688 | goto fatal_error; | |
689 | ||
690 | for (j = 0, mask = 1ULL; j < 64; j++, mask <<= 1) { | |
691 | ||
692 | /* secondary fir empty, skip it */ | |
693 | if ((fir & mask) == 0x0) | |
694 | continue; | |
695 | ||
696 | sfir_addr = (uid << 24) + 0x100 + 0x08 * j; | |
697 | sfir = __genwqe_readq(cd, sfir_addr); | |
698 | ||
699 | if (sfir == IO_ILLEGAL_VALUE) | |
700 | goto fatal_error; | |
701 | dev_err(&pci_dev->dev, | |
702 | "* 0x%08x 0x%016llx\n", sfir_addr, sfir); | |
703 | ||
704 | sfec_addr = (uid << 24) + 0x300 + 0x08 * j; | |
705 | sfec = __genwqe_readq(cd, sfec_addr); | |
706 | ||
707 | if (sfec == IO_ILLEGAL_VALUE) | |
708 | goto fatal_error; | |
709 | dev_err(&pci_dev->dev, | |
710 | "* 0x%08x 0x%016llx\n", sfec_addr, sfec); | |
711 | ||
712 | gfir = __genwqe_readq(cd, IO_SLC_CFGREG_GFIR); | |
713 | if (gfir == IO_ILLEGAL_VALUE) | |
714 | goto fatal_error; | |
715 | ||
716 | /* gfir turned on during routine! get out and | |
717 | start over. */ | |
718 | if ((gfir_masked == 0x0) && | |
719 | (gfir & GFIR_ERR_TRIGGER)) { | |
720 | goto healthMonitor; | |
721 | } | |
722 | ||
723 | /* do not clear if we entered with a fatal gfir */ | |
724 | if (gfir_masked == 0x0) { | |
725 | ||
726 | /* NEW clear by mask the logged bits */ | |
727 | sfir_addr = (uid << 24) + 0x100 + 0x08 * j; | |
728 | __genwqe_writeq(cd, sfir_addr, sfir); | |
729 | ||
730 | dev_dbg(&pci_dev->dev, | |
d9c11d45 FH |
731 | "[HM] Clearing 2ndary FIR 0x%08x with 0x%016llx\n", |
732 | sfir_addr, sfir); | |
12eb4683 FH |
733 | |
734 | /* | |
735 | * note, these cannot be error-Firs | |
736 | * since gfir_masked is 0 after sfir | |
737 | * was read. Also, it is safe to do | |
738 | * this write if sfir=0. Still need to | |
739 | * clear the primary. This just means | |
740 | * there is no secondary FIR. | |
741 | */ | |
742 | ||
743 | /* clear by mask the logged bit. */ | |
744 | fir_clr_addr = (uid << 24) + 0x10; | |
745 | __genwqe_writeq(cd, fir_clr_addr, mask); | |
746 | ||
747 | dev_dbg(&pci_dev->dev, | |
d9c11d45 FH |
748 | "[HM] Clearing primary FIR 0x%08x with 0x%016llx\n", |
749 | fir_clr_addr, mask); | |
12eb4683 FH |
750 | } |
751 | } | |
752 | } | |
753 | gfir = __genwqe_readq(cd, IO_SLC_CFGREG_GFIR); | |
754 | if (gfir == IO_ILLEGAL_VALUE) | |
755 | goto fatal_error; | |
756 | ||
757 | if ((gfir_masked == 0x0) && (gfir & GFIR_ERR_TRIGGER)) { | |
758 | /* | |
759 | * Check once more that it didn't go on after all the | |
760 | * FIRS were cleared. | |
761 | */ | |
762 | dev_dbg(&pci_dev->dev, "ACK! Another FIR! Recursing %d!\n", | |
763 | iterations); | |
764 | goto healthMonitor; | |
765 | } | |
766 | return gfir_masked; | |
767 | ||
768 | fatal_error: | |
769 | return IO_ILLEGAL_VALUE; | |
770 | } | |
771 | ||
c1f732ad KSS |
772 | /** |
773 | * genwqe_pci_fundamental_reset() - trigger a PCIe fundamental reset on the slot | |
a562c0c3 | 774 | * @pci_dev: PCI device information struct |
c1f732ad KSS |
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 | ||
a562c0c3 | 839 | /** |
c1f732ad | 840 | * genwqe_reload_bistream() - reload card bitstream |
a562c0c3 | 841 | * @cd: GenWQE device information |
c1f732ad KSS |
842 | * |
843 | * Set the appropriate register and call fundamental reset to reaload the card | |
844 | * bitstream. | |
845 | * | |
846 | * Return: 0 on success, error code otherwise | |
847 | */ | |
848 | static int genwqe_reload_bistream(struct genwqe_dev *cd) | |
849 | { | |
850 | struct pci_dev *pci_dev = cd->pci_dev; | |
851 | int rc; | |
852 | ||
853 | dev_info(&pci_dev->dev, | |
854 | "[%s] resetting card for bitstream reload\n", | |
855 | __func__); | |
856 | ||
857 | genwqe_stop(cd); | |
858 | ||
859 | /* | |
860 | * Cause a CPLD reprogram with the 'next_bitstream' | |
861 | * partition on PCIe hot or fundamental reset | |
862 | */ | |
863 | __genwqe_writeq(cd, IO_SLC_CFGREG_SOFTRESET, | |
864 | (cd->softreset & 0xcull) | 0x70ull); | |
865 | ||
866 | rc = genwqe_pci_fundamental_reset(pci_dev); | |
867 | if (rc) { | |
868 | /* | |
869 | * A fundamental reset failure can be caused | |
870 | * by lack of support on the arch, so we just | |
871 | * log the error and try to start the card | |
872 | * again. | |
873 | */ | |
874 | dev_err(&pci_dev->dev, | |
875 | "[%s] err: failed to reset card for bitstream reload\n", | |
876 | __func__); | |
877 | } | |
878 | ||
879 | rc = genwqe_start(cd); | |
880 | if (rc) { | |
881 | dev_err(&pci_dev->dev, | |
882 | "[%s] err: cannot start card services! (err=%d)\n", | |
883 | __func__, rc); | |
884 | return rc; | |
885 | } | |
886 | dev_info(&pci_dev->dev, | |
887 | "[%s] card reloaded\n", __func__); | |
888 | return 0; | |
889 | } | |
890 | ||
891 | ||
12eb4683 FH |
892 | /** |
893 | * genwqe_health_thread() - Health checking thread | |
a562c0c3 | 894 | * @data: GenWQE device information |
12eb4683 FH |
895 | * |
896 | * This thread is only started for the PF of the card. | |
897 | * | |
898 | * This thread monitors the health of the card. A critical situation | |
899 | * is when we read registers which contain -1 (IO_ILLEGAL_VALUE). In | |
900 | * this case we need to be recovered from outside. Writing to | |
901 | * registers will very likely not work either. | |
902 | * | |
903 | * This thread must only exit if kthread_should_stop() becomes true. | |
904 | * | |
905 | * Condition for the health-thread to trigger: | |
906 | * a) when a kthread_stop() request comes in or | |
907 | * b) a critical GFIR occured | |
908 | * | |
909 | * Informational GFIRs are checked and potentially printed in | |
9d14e766 | 910 | * GENWQE_HEALTH_CHECK_INTERVAL seconds. |
12eb4683 FH |
911 | */ |
912 | static int genwqe_health_thread(void *data) | |
913 | { | |
914 | int rc, should_stop = 0; | |
915 | struct genwqe_dev *cd = data; | |
916 | struct pci_dev *pci_dev = cd->pci_dev; | |
917 | u64 gfir, gfir_masked, slu_unitcfg, app_unitcfg; | |
918 | ||
93b772b2 | 919 | health_thread_begin: |
12eb4683 FH |
920 | while (!kthread_should_stop()) { |
921 | rc = wait_event_interruptible_timeout(cd->health_waitq, | |
922 | (genwqe_health_check_cond(cd, &gfir) || | |
923 | (should_stop = kthread_should_stop())), | |
9d14e766 | 924 | GENWQE_HEALTH_CHECK_INTERVAL * HZ); |
12eb4683 FH |
925 | |
926 | if (should_stop) | |
927 | break; | |
928 | ||
929 | if (gfir == IO_ILLEGAL_VALUE) { | |
930 | dev_err(&pci_dev->dev, | |
931 | "[%s] GFIR=%016llx\n", __func__, gfir); | |
932 | goto fatal_error; | |
933 | } | |
934 | ||
935 | slu_unitcfg = __genwqe_readq(cd, IO_SLU_UNITCFG); | |
936 | if (slu_unitcfg == IO_ILLEGAL_VALUE) { | |
937 | dev_err(&pci_dev->dev, | |
938 | "[%s] SLU_UNITCFG=%016llx\n", | |
939 | __func__, slu_unitcfg); | |
940 | goto fatal_error; | |
941 | } | |
942 | ||
943 | app_unitcfg = __genwqe_readq(cd, IO_APP_UNITCFG); | |
944 | if (app_unitcfg == IO_ILLEGAL_VALUE) { | |
945 | dev_err(&pci_dev->dev, | |
946 | "[%s] APP_UNITCFG=%016llx\n", | |
947 | __func__, app_unitcfg); | |
948 | goto fatal_error; | |
949 | } | |
950 | ||
951 | gfir = __genwqe_readq(cd, IO_SLC_CFGREG_GFIR); | |
952 | if (gfir == IO_ILLEGAL_VALUE) { | |
953 | dev_err(&pci_dev->dev, | |
954 | "[%s] %s: GFIR=%016llx\n", __func__, | |
955 | (gfir & GFIR_ERR_TRIGGER) ? "err" : "info", | |
956 | gfir); | |
957 | goto fatal_error; | |
958 | } | |
959 | ||
960 | gfir_masked = genwqe_fir_checking(cd); | |
961 | if (gfir_masked == IO_ILLEGAL_VALUE) | |
962 | goto fatal_error; | |
963 | ||
964 | /* | |
965 | * GFIR ErrorTrigger bits set => reset the card! | |
966 | * Never do this for old/manufacturing images! | |
967 | */ | |
968 | if ((gfir_masked) && !cd->skip_recovery && | |
969 | genwqe_recovery_on_fatal_gfir_required(cd)) { | |
970 | ||
971 | cd->card_state = GENWQE_CARD_FATAL_ERROR; | |
972 | ||
973 | rc = genwqe_recover_card(cd, 0); | |
974 | if (rc < 0) { | |
975 | /* FIXME Card is unusable and needs unbind! */ | |
976 | goto fatal_error; | |
977 | } | |
978 | } | |
979 | ||
c1f732ad KSS |
980 | if (cd->card_state == GENWQE_CARD_RELOAD_BITSTREAM) { |
981 | /* Userspace requested card bitstream reload */ | |
982 | rc = genwqe_reload_bistream(cd); | |
983 | if (rc) | |
984 | goto fatal_error; | |
985 | } | |
986 | ||
12eb4683 FH |
987 | cd->last_gfir = gfir; |
988 | cond_resched(); | |
989 | } | |
990 | ||
991 | return 0; | |
992 | ||
993 | fatal_error: | |
fb145456 KSS |
994 | if (cd->use_platform_recovery) { |
995 | /* | |
996 | * Since we use raw accessors, EEH errors won't be detected | |
997 | * by the platform until we do a non-raw MMIO or config space | |
998 | * read | |
999 | */ | |
1000 | readq(cd->mmio + IO_SLC_CFGREG_GFIR); | |
1001 | ||
1002 | /* We do nothing if the card is going over PCI recovery */ | |
1003 | if (pci_channel_offline(pci_dev)) | |
1004 | return -EIO; | |
93b772b2 KSS |
1005 | |
1006 | /* | |
1007 | * If it's supported by the platform, we try a fundamental reset | |
1008 | * to recover from a fatal error. Otherwise, we continue to wait | |
1009 | * for an external recovery procedure to take care of it. | |
1010 | */ | |
1011 | rc = genwqe_platform_recovery(cd); | |
1012 | if (!rc) | |
1013 | goto health_thread_begin; | |
fb145456 KSS |
1014 | } |
1015 | ||
12eb4683 FH |
1016 | dev_err(&pci_dev->dev, |
1017 | "[%s] card unusable. Please trigger unbind!\n", __func__); | |
1018 | ||
1019 | /* Bring down logical devices to inform user space via udev remove. */ | |
1020 | cd->card_state = GENWQE_CARD_FATAL_ERROR; | |
1021 | genwqe_stop(cd); | |
1022 | ||
1023 | /* genwqe_bus_reset failed(). Now wait for genwqe_remove(). */ | |
1024 | while (!kthread_should_stop()) | |
1025 | cond_resched(); | |
1026 | ||
1027 | return -EIO; | |
1028 | } | |
1029 | ||
1030 | static int genwqe_health_check_start(struct genwqe_dev *cd) | |
1031 | { | |
1032 | int rc; | |
1033 | ||
9d14e766 | 1034 | if (GENWQE_HEALTH_CHECK_INTERVAL <= 0) |
12eb4683 FH |
1035 | return 0; /* valid for disabling the service */ |
1036 | ||
1037 | /* moved before request_irq() */ | |
1038 | /* init_waitqueue_head(&cd->health_waitq); */ | |
1039 | ||
1040 | cd->health_thread = kthread_run(genwqe_health_thread, cd, | |
1041 | GENWQE_DEVNAME "%d_health", | |
1042 | cd->card_idx); | |
1043 | if (IS_ERR(cd->health_thread)) { | |
1044 | rc = PTR_ERR(cd->health_thread); | |
1045 | cd->health_thread = NULL; | |
1046 | return rc; | |
1047 | } | |
1048 | return 0; | |
1049 | } | |
1050 | ||
1051 | static int genwqe_health_thread_running(struct genwqe_dev *cd) | |
1052 | { | |
1053 | return cd->health_thread != NULL; | |
1054 | } | |
1055 | ||
1056 | static int genwqe_health_check_stop(struct genwqe_dev *cd) | |
1057 | { | |
12eb4683 FH |
1058 | if (!genwqe_health_thread_running(cd)) |
1059 | return -EIO; | |
1060 | ||
f33e92e5 | 1061 | kthread_stop(cd->health_thread); |
12eb4683 FH |
1062 | cd->health_thread = NULL; |
1063 | return 0; | |
1064 | } | |
1065 | ||
1066 | /** | |
1067 | * genwqe_pci_setup() - Allocate PCIe related resources for our card | |
a562c0c3 | 1068 | * @cd: GenWQE device information |
12eb4683 FH |
1069 | */ |
1070 | static int genwqe_pci_setup(struct genwqe_dev *cd) | |
1071 | { | |
f03774bd | 1072 | int err; |
12eb4683 FH |
1073 | struct pci_dev *pci_dev = cd->pci_dev; |
1074 | ||
12eb4683 FH |
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 */ | |
f03774bd | 1083 | err = pci_request_mem_regions(pci_dev, genwqe_driver_name); |
12eb4683 FH |
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) */ | |
12eb4683 | 1092 | /* check for 32-bit DMA address supported (SAC) */ |
8d753db5 | 1093 | if (dma_set_mask_and_coherent(&pci_dev->dev, DMA_BIT_MASK(64)) && |
505b0877 | 1094 | dma_set_mask_and_coherent(&pci_dev->dev, DMA_BIT_MASK(32))) { |
12eb4683 FH |
1095 | dev_err(&pci_dev->dev, |
1096 | "err: neither DMA32 nor DMA64 supported\n"); | |
1097 | err = -EIO; | |
1098 | goto out_release_resources; | |
1099 | } | |
1100 | ||
1101 | pci_set_master(pci_dev); | |
1102 | pci_enable_pcie_error_reporting(pci_dev); | |
1103 | ||
fb145456 KSS |
1104 | /* EEH recovery requires PCIe fundamental reset */ |
1105 | pci_dev->needs_freset = 1; | |
1106 | ||
12eb4683 FH |
1107 | /* request complete BAR-0 space (length = 0) */ |
1108 | cd->mmio_len = pci_resource_len(pci_dev, 0); | |
1109 | cd->mmio = pci_iomap(pci_dev, 0, 0); | |
1110 | if (cd->mmio == NULL) { | |
1111 | dev_err(&pci_dev->dev, | |
1112 | "[%s] err: mapping BAR0 failed\n", __func__); | |
1113 | err = -ENOMEM; | |
1114 | goto out_release_resources; | |
1115 | } | |
1116 | ||
1117 | cd->num_vfs = pci_sriov_get_totalvfs(pci_dev); | |
95a8825c FH |
1118 | if (cd->num_vfs < 0) |
1119 | cd->num_vfs = 0; | |
12eb4683 FH |
1120 | |
1121 | err = genwqe_read_ids(cd); | |
1122 | if (err) | |
1123 | goto out_iounmap; | |
1124 | ||
1125 | return 0; | |
1126 | ||
1127 | out_iounmap: | |
1128 | pci_iounmap(pci_dev, cd->mmio); | |
1129 | out_release_resources: | |
f03774bd | 1130 | pci_release_mem_regions(pci_dev); |
12eb4683 FH |
1131 | err_disable_device: |
1132 | pci_disable_device(pci_dev); | |
1133 | err_out: | |
1134 | return err; | |
1135 | } | |
1136 | ||
1137 | /** | |
1138 | * genwqe_pci_remove() - Free PCIe related resources for our card | |
a562c0c3 | 1139 | * @cd: GenWQE device information |
12eb4683 FH |
1140 | */ |
1141 | static void genwqe_pci_remove(struct genwqe_dev *cd) | |
1142 | { | |
12eb4683 FH |
1143 | struct pci_dev *pci_dev = cd->pci_dev; |
1144 | ||
1145 | if (cd->mmio) | |
1146 | pci_iounmap(pci_dev, cd->mmio); | |
1147 | ||
f03774bd | 1148 | pci_release_mem_regions(pci_dev); |
12eb4683 FH |
1149 | pci_disable_device(pci_dev); |
1150 | } | |
1151 | ||
1152 | /** | |
1153 | * genwqe_probe() - Device initialization | |
a562c0c3 LJ |
1154 | * @pci_dev: PCI device information struct |
1155 | * @id: PCI device ID | |
12eb4683 FH |
1156 | * |
1157 | * Callable for multiple cards. This function is called on bind. | |
1158 | * | |
1159 | * Return: 0 if succeeded, < 0 when failed | |
1160 | */ | |
1161 | static int genwqe_probe(struct pci_dev *pci_dev, | |
1162 | const struct pci_device_id *id) | |
1163 | { | |
1164 | int err; | |
1165 | struct genwqe_dev *cd; | |
1166 | ||
1167 | genwqe_init_crc32(); | |
1168 | ||
1169 | cd = genwqe_dev_alloc(); | |
1170 | if (IS_ERR(cd)) { | |
1171 | dev_err(&pci_dev->dev, "err: could not alloc mem (err=%d)!\n", | |
1172 | (int)PTR_ERR(cd)); | |
1173 | return PTR_ERR(cd); | |
1174 | } | |
1175 | ||
1176 | dev_set_drvdata(&pci_dev->dev, cd); | |
1177 | cd->pci_dev = pci_dev; | |
1178 | ||
1179 | err = genwqe_pci_setup(cd); | |
1180 | if (err < 0) { | |
1181 | dev_err(&pci_dev->dev, | |
1182 | "err: problems with PCI setup (err=%d)\n", err); | |
1183 | goto out_free_dev; | |
1184 | } | |
1185 | ||
1186 | err = genwqe_start(cd); | |
1187 | if (err < 0) { | |
1188 | dev_err(&pci_dev->dev, | |
1189 | "err: cannot start card services! (err=%d)\n", err); | |
1190 | goto out_pci_remove; | |
1191 | } | |
1192 | ||
1193 | if (genwqe_is_privileged(cd)) { | |
1194 | err = genwqe_health_check_start(cd); | |
1195 | if (err < 0) { | |
1196 | dev_err(&pci_dev->dev, | |
d9c11d45 FH |
1197 | "err: cannot start health checking! (err=%d)\n", |
1198 | err); | |
12eb4683 FH |
1199 | goto out_stop_services; |
1200 | } | |
1201 | } | |
1202 | return 0; | |
1203 | ||
1204 | out_stop_services: | |
1205 | genwqe_stop(cd); | |
1206 | out_pci_remove: | |
1207 | genwqe_pci_remove(cd); | |
1208 | out_free_dev: | |
1209 | genwqe_dev_free(cd); | |
1210 | return err; | |
1211 | } | |
1212 | ||
1213 | /** | |
1214 | * genwqe_remove() - Called when device is removed (hot-plugable) | |
a562c0c3 | 1215 | * @pci_dev: PCI device information struct |
12eb4683 FH |
1216 | * |
1217 | * Or when driver is unloaded respecitively when unbind is done. | |
1218 | */ | |
1219 | static void genwqe_remove(struct pci_dev *pci_dev) | |
1220 | { | |
1221 | struct genwqe_dev *cd = dev_get_drvdata(&pci_dev->dev); | |
1222 | ||
1223 | genwqe_health_check_stop(cd); | |
1224 | ||
1225 | /* | |
1226 | * genwqe_stop() must survive if it is called twice | |
1227 | * sequentially. This happens when the health thread calls it | |
1228 | * and fails on genwqe_bus_reset(). | |
1229 | */ | |
1230 | genwqe_stop(cd); | |
1231 | genwqe_pci_remove(cd); | |
1232 | genwqe_dev_free(cd); | |
1233 | } | |
1234 | ||
a562c0c3 | 1235 | /** |
12eb4683 | 1236 | * genwqe_err_error_detected() - Error detection callback |
a562c0c3 LJ |
1237 | * @pci_dev: PCI device information struct |
1238 | * @state: PCI channel state | |
12eb4683 FH |
1239 | * |
1240 | * This callback is called by the PCI subsystem whenever a PCI bus | |
1241 | * error is detected. | |
1242 | */ | |
1243 | static pci_ers_result_t genwqe_err_error_detected(struct pci_dev *pci_dev, | |
16d79cd4 | 1244 | pci_channel_state_t state) |
12eb4683 FH |
1245 | { |
1246 | struct genwqe_dev *cd; | |
1247 | ||
1248 | dev_err(&pci_dev->dev, "[%s] state=%d\n", __func__, state); | |
1249 | ||
12eb4683 FH |
1250 | cd = dev_get_drvdata(&pci_dev->dev); |
1251 | if (cd == NULL) | |
fb145456 | 1252 | return PCI_ERS_RESULT_DISCONNECT; |
12eb4683 | 1253 | |
fb145456 KSS |
1254 | /* Stop the card */ |
1255 | genwqe_health_check_stop(cd); | |
1256 | genwqe_stop(cd); | |
1257 | ||
1258 | /* | |
1259 | * On permanent failure, the PCI code will call device remove | |
1260 | * after the return of this function. | |
1261 | * genwqe_stop() can be called twice. | |
1262 | */ | |
1263 | if (state == pci_channel_io_perm_failure) { | |
12eb4683 | 1264 | return PCI_ERS_RESULT_DISCONNECT; |
fb145456 KSS |
1265 | } else { |
1266 | genwqe_pci_remove(cd); | |
1267 | return PCI_ERS_RESULT_NEED_RESET; | |
12eb4683 | 1268 | } |
fb145456 KSS |
1269 | } |
1270 | ||
1271 | static pci_ers_result_t genwqe_err_slot_reset(struct pci_dev *pci_dev) | |
1272 | { | |
1273 | int rc; | |
1274 | struct genwqe_dev *cd = dev_get_drvdata(&pci_dev->dev); | |
12eb4683 | 1275 | |
fb145456 KSS |
1276 | rc = genwqe_pci_setup(cd); |
1277 | if (!rc) { | |
1278 | return PCI_ERS_RESULT_RECOVERED; | |
1279 | } else { | |
1280 | dev_err(&pci_dev->dev, | |
1281 | "err: problems with PCI setup (err=%d)\n", rc); | |
1282 | return PCI_ERS_RESULT_DISCONNECT; | |
1283 | } | |
12eb4683 FH |
1284 | } |
1285 | ||
1286 | static pci_ers_result_t genwqe_err_result_none(struct pci_dev *dev) | |
1287 | { | |
1288 | return PCI_ERS_RESULT_NONE; | |
1289 | } | |
1290 | ||
fb145456 | 1291 | static void genwqe_err_resume(struct pci_dev *pci_dev) |
12eb4683 | 1292 | { |
fb145456 KSS |
1293 | int rc; |
1294 | struct genwqe_dev *cd = dev_get_drvdata(&pci_dev->dev); | |
1295 | ||
1296 | rc = genwqe_start(cd); | |
1297 | if (!rc) { | |
1298 | rc = genwqe_health_check_start(cd); | |
1299 | if (rc) | |
1300 | dev_err(&pci_dev->dev, | |
1301 | "err: cannot start health checking! (err=%d)\n", | |
1302 | rc); | |
1303 | } else { | |
1304 | dev_err(&pci_dev->dev, | |
1305 | "err: cannot start card services! (err=%d)\n", rc); | |
1306 | } | |
12eb4683 FH |
1307 | } |
1308 | ||
1309 | static int genwqe_sriov_configure(struct pci_dev *dev, int numvfs) | |
1310 | { | |
bc407dd3 | 1311 | int rc; |
12eb4683 FH |
1312 | struct genwqe_dev *cd = dev_get_drvdata(&dev->dev); |
1313 | ||
1314 | if (numvfs > 0) { | |
1315 | genwqe_setup_vf_jtimer(cd); | |
bc407dd3 FH |
1316 | rc = pci_enable_sriov(dev, numvfs); |
1317 | if (rc < 0) | |
1318 | return rc; | |
12eb4683 FH |
1319 | return numvfs; |
1320 | } | |
1321 | if (numvfs == 0) { | |
1322 | pci_disable_sriov(dev); | |
1323 | return 0; | |
1324 | } | |
1325 | return 0; | |
1326 | } | |
1327 | ||
f0838790 | 1328 | static const struct pci_error_handlers genwqe_err_handler = { |
12eb4683 FH |
1329 | .error_detected = genwqe_err_error_detected, |
1330 | .mmio_enabled = genwqe_err_result_none, | |
fb145456 | 1331 | .slot_reset = genwqe_err_slot_reset, |
12eb4683 FH |
1332 | .resume = genwqe_err_resume, |
1333 | }; | |
1334 | ||
1335 | static struct pci_driver genwqe_driver = { | |
1336 | .name = genwqe_driver_name, | |
1337 | .id_table = genwqe_device_table, | |
1338 | .probe = genwqe_probe, | |
1339 | .remove = genwqe_remove, | |
1340 | .sriov_configure = genwqe_sriov_configure, | |
1341 | .err_handler = &genwqe_err_handler, | |
1342 | }; | |
1343 | ||
5ed22ceb FH |
1344 | /** |
1345 | * genwqe_devnode() - Set default access mode for genwqe devices. | |
a562c0c3 LJ |
1346 | * @dev: Pointer to device (unused) |
1347 | * @mode: Carrier to pass-back given mode (permissions) | |
5ed22ceb FH |
1348 | * |
1349 | * Default mode should be rw for everybody. Do not change default | |
1350 | * device name. | |
1351 | */ | |
1352 | static char *genwqe_devnode(struct device *dev, umode_t *mode) | |
1353 | { | |
1354 | if (mode) | |
1355 | *mode = 0666; | |
1356 | return NULL; | |
1357 | } | |
1358 | ||
12eb4683 FH |
1359 | /** |
1360 | * genwqe_init_module() - Driver registration and initialization | |
1361 | */ | |
1362 | static int __init genwqe_init_module(void) | |
1363 | { | |
1364 | int rc; | |
1365 | ||
1366 | class_genwqe = class_create(THIS_MODULE, GENWQE_DEVNAME); | |
1367 | if (IS_ERR(class_genwqe)) { | |
1368 | pr_err("[%s] create class failed\n", __func__); | |
1369 | return -ENOMEM; | |
1370 | } | |
1371 | ||
5ed22ceb FH |
1372 | class_genwqe->devnode = genwqe_devnode; |
1373 | ||
12eb4683 | 1374 | debugfs_genwqe = debugfs_create_dir(GENWQE_DEVNAME, NULL); |
12eb4683 FH |
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); | |
12eb4683 FH |
1386 | class_destroy(class_genwqe); |
1387 | return rc; | |
1388 | } | |
1389 | ||
1390 | /** | |
1391 | * genwqe_exit_module() - Driver exit | |
1392 | */ | |
1393 | static void __exit genwqe_exit_module(void) | |
1394 | { | |
1395 | pci_unregister_driver(&genwqe_driver); | |
1396 | debugfs_remove(debugfs_genwqe); | |
1397 | class_destroy(class_genwqe); | |
1398 | } | |
1399 | ||
1400 | module_init(genwqe_init_module); | |
1401 | module_exit(genwqe_exit_module); |