1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * SN Platform GRU Driver
4 *
5 * FILE OPERATIONS & DRIVER INITIALIZATION
6 *
7 * This file supports the user system call for file open, close, mmap, etc.
8 * This also incudes the driver initialization code.
9 *
10 * (C) Copyright 2020 Hewlett Packard Enterprise Development LP
11 * Copyright (c) 2008-2014 Silicon Graphics, Inc. All Rights Reserved.
12 */
13
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/errno.h>
17 #include <linux/slab.h>
18 #include <linux/mm.h>
19 #include <linux/io.h>
20 #include <linux/spinlock.h>
21 #include <linux/device.h>
22 #include <linux/miscdevice.h>
23 #include <linux/interrupt.h>
24 #include <linux/proc_fs.h>
25 #include <linux/uaccess.h>
26 #ifdef CONFIG_X86_64
27 #include <asm/uv/uv_irq.h>
28 #endif
29 #include <asm/uv/uv.h>
30 #include "gru.h"
31 #include "grulib.h"
32 #include "grutables.h"
33
34 #include <asm/uv/uv_hub.h>
35 #include <asm/uv/uv_mmrs.h>
36
37 struct gru_blade_state *gru_base[GRU_MAX_BLADES] __read_mostly;
38 unsigned long gru_start_paddr __read_mostly;
39 void *gru_start_vaddr __read_mostly;
40 unsigned long gru_end_paddr __read_mostly;
41 unsigned int gru_max_gids __read_mostly;
42 struct gru_stats_s gru_stats;
43
44 /* Guaranteed user available resources on each node */
45 static int max_user_cbrs, max_user_dsr_bytes;
46
47 static struct miscdevice gru_miscdev;
48
gru_supported(void)49 static int gru_supported(void)
50 {
51 return is_uv_system() &&
52 (uv_hub_info->hub_revision < UV3_HUB_REVISION_BASE);
53 }
54
55 /*
56 * gru_vma_close
57 *
58 * Called when unmapping a device mapping. Frees all gru resources
59 * and tables belonging to the vma.
60 */
gru_vma_close(struct vm_area_struct * vma)61 static void gru_vma_close(struct vm_area_struct *vma)
62 {
63 struct gru_vma_data *vdata;
64 struct gru_thread_state *gts;
65 struct list_head *entry, *next;
66
67 if (!vma->vm_private_data)
68 return;
69
70 vdata = vma->vm_private_data;
71 vma->vm_private_data = NULL;
72 gru_dbg(grudev, "vma %p, file %p, vdata %p\n", vma, vma->vm_file,
73 vdata);
74 list_for_each_safe(entry, next, &vdata->vd_head) {
75 gts =
76 list_entry(entry, struct gru_thread_state, ts_next);
77 list_del(>s->ts_next);
78 mutex_lock(>s->ts_ctxlock);
79 if (gts->ts_gru)
80 gru_unload_context(gts, 0);
81 mutex_unlock(>s->ts_ctxlock);
82 gts_drop(gts);
83 }
84 kfree(vdata);
85 STAT(vdata_free);
86 }
87
88 /*
89 * gru_file_mmap
90 *
91 * Called when mmapping the device. Initializes the vma with a fault handler
92 * and private data structure necessary to allocate, track, and free the
93 * underlying pages.
94 */
gru_file_mmap(struct file * file,struct vm_area_struct * vma)95 static int gru_file_mmap(struct file *file, struct vm_area_struct *vma)
96 {
97 if ((vma->vm_flags & (VM_SHARED | VM_WRITE)) != (VM_SHARED | VM_WRITE))
98 return -EPERM;
99
100 if (vma->vm_start & (GRU_GSEG_PAGESIZE - 1) ||
101 vma->vm_end & (GRU_GSEG_PAGESIZE - 1))
102 return -EINVAL;
103
104 vm_flags_set(vma, VM_IO | VM_PFNMAP | VM_LOCKED |
105 VM_DONTCOPY | VM_DONTEXPAND | VM_DONTDUMP);
106 vma->vm_page_prot = PAGE_SHARED;
107 vma->vm_ops = &gru_vm_ops;
108
109 vma->vm_private_data = gru_alloc_vma_data(vma, 0);
110 if (!vma->vm_private_data)
111 return -ENOMEM;
112
113 gru_dbg(grudev, "file %p, vaddr 0x%lx, vma %p, vdata %p\n",
114 file, vma->vm_start, vma, vma->vm_private_data);
115 return 0;
116 }
117
118 /*
119 * Create a new GRU context
120 */
gru_create_new_context(unsigned long arg)121 static int gru_create_new_context(unsigned long arg)
122 {
123 struct gru_create_context_req req;
124 struct vm_area_struct *vma;
125 struct gru_vma_data *vdata;
126 int ret = -EINVAL;
127
128 if (copy_from_user(&req, (void __user *)arg, sizeof(req)))
129 return -EFAULT;
130
131 if (req.data_segment_bytes > max_user_dsr_bytes)
132 return -EINVAL;
133 if (req.control_blocks > max_user_cbrs || !req.maximum_thread_count)
134 return -EINVAL;
135
136 if (!(req.options & GRU_OPT_MISS_MASK))
137 req.options |= GRU_OPT_MISS_FMM_INTR;
138
139 mmap_write_lock(current->mm);
140 vma = gru_find_vma(req.gseg);
141 if (vma) {
142 vdata = vma->vm_private_data;
143 vdata->vd_user_options = req.options;
144 vdata->vd_dsr_au_count =
145 GRU_DS_BYTES_TO_AU(req.data_segment_bytes);
146 vdata->vd_cbr_au_count = GRU_CB_COUNT_TO_AU(req.control_blocks);
147 vdata->vd_tlb_preload_count = req.tlb_preload_count;
148 ret = 0;
149 }
150 mmap_write_unlock(current->mm);
151
152 return ret;
153 }
154
155 /*
156 * Get GRU configuration info (temp - for emulator testing)
157 */
gru_get_config_info(unsigned long arg)158 static long gru_get_config_info(unsigned long arg)
159 {
160 struct gru_config_info info;
161 int nodesperblade;
162
163 if (num_online_nodes() > 1 &&
164 (uv_node_to_blade_id(1) == uv_node_to_blade_id(0)))
165 nodesperblade = 2;
166 else
167 nodesperblade = 1;
168 memset(&info, 0, sizeof(info));
169 info.cpus = num_online_cpus();
170 info.nodes = num_online_nodes();
171 info.blades = info.nodes / nodesperblade;
172 info.chiplets = GRU_CHIPLETS_PER_BLADE * info.blades;
173
174 if (copy_to_user((void __user *)arg, &info, sizeof(info)))
175 return -EFAULT;
176 return 0;
177 }
178
179 /*
180 * gru_file_unlocked_ioctl
181 *
182 * Called to update file attributes via IOCTL calls.
183 */
gru_file_unlocked_ioctl(struct file * file,unsigned int req,unsigned long arg)184 static long gru_file_unlocked_ioctl(struct file *file, unsigned int req,
185 unsigned long arg)
186 {
187 int err = -EBADRQC;
188
189 gru_dbg(grudev, "file %p, req 0x%x, 0x%lx\n", file, req, arg);
190
191 switch (req) {
192 case GRU_CREATE_CONTEXT:
193 err = gru_create_new_context(arg);
194 break;
195 case GRU_SET_CONTEXT_OPTION:
196 err = gru_set_context_option(arg);
197 break;
198 case GRU_USER_GET_EXCEPTION_DETAIL:
199 err = gru_get_exception_detail(arg);
200 break;
201 case GRU_USER_UNLOAD_CONTEXT:
202 err = gru_user_unload_context(arg);
203 break;
204 case GRU_USER_FLUSH_TLB:
205 err = gru_user_flush_tlb(arg);
206 break;
207 case GRU_USER_CALL_OS:
208 err = gru_handle_user_call_os(arg);
209 break;
210 case GRU_GET_GSEG_STATISTICS:
211 err = gru_get_gseg_statistics(arg);
212 break;
213 case GRU_KTEST:
214 err = gru_ktest(arg);
215 break;
216 case GRU_GET_CONFIG_INFO:
217 err = gru_get_config_info(arg);
218 break;
219 case GRU_DUMP_CHIPLET_STATE:
220 err = gru_dump_chiplet_request(arg);
221 break;
222 }
223 return err;
224 }
225
226 /*
227 * Called at init time to build tables for all GRUs that are present in the
228 * system.
229 */
gru_init_chiplet(struct gru_state * gru,unsigned long paddr,void * vaddr,int blade_id,int chiplet_id)230 static void gru_init_chiplet(struct gru_state *gru, unsigned long paddr,
231 void *vaddr, int blade_id, int chiplet_id)
232 {
233 spin_lock_init(&gru->gs_lock);
234 spin_lock_init(&gru->gs_asid_lock);
235 gru->gs_gru_base_paddr = paddr;
236 gru->gs_gru_base_vaddr = vaddr;
237 gru->gs_gid = blade_id * GRU_CHIPLETS_PER_BLADE + chiplet_id;
238 gru->gs_blade = gru_base[blade_id];
239 gru->gs_blade_id = blade_id;
240 gru->gs_chiplet_id = chiplet_id;
241 gru->gs_cbr_map = (GRU_CBR_AU == 64) ? ~0 : (1UL << GRU_CBR_AU) - 1;
242 gru->gs_dsr_map = (1UL << GRU_DSR_AU) - 1;
243 gru->gs_asid_limit = MAX_ASID;
244 gru_tgh_flush_init(gru);
245 if (gru->gs_gid >= gru_max_gids)
246 gru_max_gids = gru->gs_gid + 1;
247 gru_dbg(grudev, "bid %d, gid %d, vaddr %p (0x%lx)\n",
248 blade_id, gru->gs_gid, gru->gs_gru_base_vaddr,
249 gru->gs_gru_base_paddr);
250 }
251
gru_init_tables(unsigned long gru_base_paddr,void * gru_base_vaddr)252 static int gru_init_tables(unsigned long gru_base_paddr, void *gru_base_vaddr)
253 {
254 int pnode, nid, bid, chip;
255 int cbrs, dsrbytes, n;
256 int order = get_order(sizeof(struct gru_blade_state));
257 struct page *page;
258 struct gru_state *gru;
259 unsigned long paddr;
260 void *vaddr;
261
262 max_user_cbrs = GRU_NUM_CB;
263 max_user_dsr_bytes = GRU_NUM_DSR_BYTES;
264 for_each_possible_blade(bid) {
265 pnode = uv_blade_to_pnode(bid);
266 nid = uv_blade_to_memory_nid(bid);/* -1 if no memory on blade */
267 page = alloc_pages_node(nid, GFP_KERNEL, order);
268 if (!page)
269 goto fail;
270 gru_base[bid] = page_address(page);
271 memset(gru_base[bid], 0, sizeof(struct gru_blade_state));
272 gru_base[bid]->bs_lru_gru = &gru_base[bid]->bs_grus[0];
273 spin_lock_init(&gru_base[bid]->bs_lock);
274 init_rwsem(&gru_base[bid]->bs_kgts_sema);
275
276 dsrbytes = 0;
277 cbrs = 0;
278 for (gru = gru_base[bid]->bs_grus, chip = 0;
279 chip < GRU_CHIPLETS_PER_BLADE;
280 chip++, gru++) {
281 paddr = gru_chiplet_paddr(gru_base_paddr, pnode, chip);
282 vaddr = gru_chiplet_vaddr(gru_base_vaddr, pnode, chip);
283 gru_init_chiplet(gru, paddr, vaddr, bid, chip);
284 n = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE;
285 cbrs = max(cbrs, n);
286 n = hweight64(gru->gs_dsr_map) * GRU_DSR_AU_BYTES;
287 dsrbytes = max(dsrbytes, n);
288 }
289 max_user_cbrs = min(max_user_cbrs, cbrs);
290 max_user_dsr_bytes = min(max_user_dsr_bytes, dsrbytes);
291 }
292
293 return 0;
294
295 fail:
296 for (bid--; bid >= 0; bid--)
297 free_pages((unsigned long)gru_base[bid], order);
298 return -ENOMEM;
299 }
300
gru_free_tables(void)301 static void gru_free_tables(void)
302 {
303 int bid;
304 int order = get_order(sizeof(struct gru_state) *
305 GRU_CHIPLETS_PER_BLADE);
306
307 for (bid = 0; bid < GRU_MAX_BLADES; bid++)
308 free_pages((unsigned long)gru_base[bid], order);
309 }
310
gru_chiplet_cpu_to_mmr(int chiplet,int cpu,int * corep)311 static unsigned long gru_chiplet_cpu_to_mmr(int chiplet, int cpu, int *corep)
312 {
313 unsigned long mmr = 0;
314 int core;
315
316 /*
317 * We target the cores of a blade and not the hyperthreads themselves.
318 * There is a max of 8 cores per socket and 2 sockets per blade,
319 * making for a max total of 16 cores (i.e., 16 CPUs without
320 * hyperthreading and 32 CPUs with hyperthreading).
321 */
322 core = uv_cpu_core_number(cpu) + UV_MAX_INT_CORES * uv_cpu_socket_number(cpu);
323 if (core >= GRU_NUM_TFM || uv_cpu_ht_number(cpu))
324 return 0;
325
326 if (chiplet == 0) {
327 mmr = UVH_GR0_TLB_INT0_CONFIG +
328 core * (UVH_GR0_TLB_INT1_CONFIG - UVH_GR0_TLB_INT0_CONFIG);
329 } else if (chiplet == 1) {
330 mmr = UVH_GR1_TLB_INT0_CONFIG +
331 core * (UVH_GR1_TLB_INT1_CONFIG - UVH_GR1_TLB_INT0_CONFIG);
332 } else {
333 BUG();
334 }
335
336 *corep = core;
337 return mmr;
338 }
339
340 #ifdef CONFIG_IA64
341
342 static int gru_irq_count[GRU_CHIPLETS_PER_BLADE];
343
gru_noop(struct irq_data * d)344 static void gru_noop(struct irq_data *d)
345 {
346 }
347
348 static struct irq_chip gru_chip[GRU_CHIPLETS_PER_BLADE] = {
349 [0 ... GRU_CHIPLETS_PER_BLADE - 1] {
350 .irq_mask = gru_noop,
351 .irq_unmask = gru_noop,
352 .irq_ack = gru_noop
353 }
354 };
355
gru_chiplet_setup_tlb_irq(int chiplet,char * irq_name,irq_handler_t irq_handler,int cpu,int blade)356 static int gru_chiplet_setup_tlb_irq(int chiplet, char *irq_name,
357 irq_handler_t irq_handler, int cpu, int blade)
358 {
359 unsigned long mmr;
360 int irq = IRQ_GRU + chiplet;
361 int ret, core;
362
363 mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core);
364 if (mmr == 0)
365 return 0;
366
367 if (gru_irq_count[chiplet] == 0) {
368 gru_chip[chiplet].name = irq_name;
369 ret = irq_set_chip(irq, &gru_chip[chiplet]);
370 if (ret) {
371 printk(KERN_ERR "%s: set_irq_chip failed, errno=%d\n",
372 GRU_DRIVER_ID_STR, -ret);
373 return ret;
374 }
375
376 ret = request_irq(irq, irq_handler, 0, irq_name, NULL);
377 if (ret) {
378 printk(KERN_ERR "%s: request_irq failed, errno=%d\n",
379 GRU_DRIVER_ID_STR, -ret);
380 return ret;
381 }
382 }
383 gru_irq_count[chiplet]++;
384
385 return 0;
386 }
387
gru_chiplet_teardown_tlb_irq(int chiplet,int cpu,int blade)388 static void gru_chiplet_teardown_tlb_irq(int chiplet, int cpu, int blade)
389 {
390 unsigned long mmr;
391 int core, irq = IRQ_GRU + chiplet;
392
393 if (gru_irq_count[chiplet] == 0)
394 return;
395
396 mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core);
397 if (mmr == 0)
398 return;
399
400 if (--gru_irq_count[chiplet] == 0)
401 free_irq(irq, NULL);
402 }
403
404 #elif defined CONFIG_X86_64
405
gru_chiplet_setup_tlb_irq(int chiplet,char * irq_name,irq_handler_t irq_handler,int cpu,int blade)406 static int gru_chiplet_setup_tlb_irq(int chiplet, char *irq_name,
407 irq_handler_t irq_handler, int cpu, int blade)
408 {
409 unsigned long mmr;
410 int irq, core;
411 int ret;
412
413 mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core);
414 if (mmr == 0)
415 return 0;
416
417 irq = uv_setup_irq(irq_name, cpu, blade, mmr, UV_AFFINITY_CPU);
418 if (irq < 0) {
419 printk(KERN_ERR "%s: uv_setup_irq failed, errno=%d\n",
420 GRU_DRIVER_ID_STR, -irq);
421 return irq;
422 }
423
424 ret = request_irq(irq, irq_handler, 0, irq_name, NULL);
425 if (ret) {
426 uv_teardown_irq(irq);
427 printk(KERN_ERR "%s: request_irq failed, errno=%d\n",
428 GRU_DRIVER_ID_STR, -ret);
429 return ret;
430 }
431 gru_base[blade]->bs_grus[chiplet].gs_irq[core] = irq;
432 return 0;
433 }
434
gru_chiplet_teardown_tlb_irq(int chiplet,int cpu,int blade)435 static void gru_chiplet_teardown_tlb_irq(int chiplet, int cpu, int blade)
436 {
437 int irq, core;
438 unsigned long mmr;
439
440 mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core);
441 if (mmr) {
442 irq = gru_base[blade]->bs_grus[chiplet].gs_irq[core];
443 if (irq) {
444 free_irq(irq, NULL);
445 uv_teardown_irq(irq);
446 }
447 }
448 }
449
450 #endif
451
gru_teardown_tlb_irqs(void)452 static void gru_teardown_tlb_irqs(void)
453 {
454 int blade;
455 int cpu;
456
457 for_each_online_cpu(cpu) {
458 blade = uv_cpu_to_blade_id(cpu);
459 gru_chiplet_teardown_tlb_irq(0, cpu, blade);
460 gru_chiplet_teardown_tlb_irq(1, cpu, blade);
461 }
462 for_each_possible_blade(blade) {
463 if (uv_blade_nr_possible_cpus(blade))
464 continue;
465 gru_chiplet_teardown_tlb_irq(0, 0, blade);
466 gru_chiplet_teardown_tlb_irq(1, 0, blade);
467 }
468 }
469
gru_setup_tlb_irqs(void)470 static int gru_setup_tlb_irqs(void)
471 {
472 int blade;
473 int cpu;
474 int ret;
475
476 for_each_online_cpu(cpu) {
477 blade = uv_cpu_to_blade_id(cpu);
478 ret = gru_chiplet_setup_tlb_irq(0, "GRU0_TLB", gru0_intr, cpu, blade);
479 if (ret != 0)
480 goto exit1;
481
482 ret = gru_chiplet_setup_tlb_irq(1, "GRU1_TLB", gru1_intr, cpu, blade);
483 if (ret != 0)
484 goto exit1;
485 }
486 for_each_possible_blade(blade) {
487 if (uv_blade_nr_possible_cpus(blade))
488 continue;
489 ret = gru_chiplet_setup_tlb_irq(0, "GRU0_TLB", gru_intr_mblade, 0, blade);
490 if (ret != 0)
491 goto exit1;
492
493 ret = gru_chiplet_setup_tlb_irq(1, "GRU1_TLB", gru_intr_mblade, 0, blade);
494 if (ret != 0)
495 goto exit1;
496 }
497
498 return 0;
499
500 exit1:
501 gru_teardown_tlb_irqs();
502 return ret;
503 }
504
505 /*
506 * gru_init
507 *
508 * Called at boot or module load time to initialize the GRUs.
509 */
gru_init(void)510 static int __init gru_init(void)
511 {
512 int ret;
513
514 if (!gru_supported())
515 return 0;
516
517 #if defined CONFIG_IA64
518 gru_start_paddr = 0xd000000000UL; /* ZZZZZZZZZZZZZZZZZZZ fixme */
519 #else
520 gru_start_paddr = uv_read_local_mmr(UVH_RH_GAM_GRU_OVERLAY_CONFIG) &
521 0x7fffffffffffUL;
522 #endif
523 gru_start_vaddr = __va(gru_start_paddr);
524 gru_end_paddr = gru_start_paddr + GRU_MAX_BLADES * GRU_SIZE;
525 printk(KERN_INFO "GRU space: 0x%lx - 0x%lx\n",
526 gru_start_paddr, gru_end_paddr);
527 ret = misc_register(&gru_miscdev);
528 if (ret) {
529 printk(KERN_ERR "%s: misc_register failed\n",
530 GRU_DRIVER_ID_STR);
531 goto exit0;
532 }
533
534 ret = gru_proc_init();
535 if (ret) {
536 printk(KERN_ERR "%s: proc init failed\n", GRU_DRIVER_ID_STR);
537 goto exit1;
538 }
539
540 ret = gru_init_tables(gru_start_paddr, gru_start_vaddr);
541 if (ret) {
542 printk(KERN_ERR "%s: init tables failed\n", GRU_DRIVER_ID_STR);
543 goto exit2;
544 }
545
546 ret = gru_setup_tlb_irqs();
547 if (ret != 0)
548 goto exit3;
549
550 gru_kservices_init();
551
552 printk(KERN_INFO "%s: v%s\n", GRU_DRIVER_ID_STR,
553 GRU_DRIVER_VERSION_STR);
554 return 0;
555
556 exit3:
557 gru_free_tables();
558 exit2:
559 gru_proc_exit();
560 exit1:
561 misc_deregister(&gru_miscdev);
562 exit0:
563 return ret;
564
565 }
566
gru_exit(void)567 static void __exit gru_exit(void)
568 {
569 if (!gru_supported())
570 return;
571
572 gru_teardown_tlb_irqs();
573 gru_kservices_exit();
574 gru_free_tables();
575 misc_deregister(&gru_miscdev);
576 gru_proc_exit();
577 mmu_notifier_synchronize();
578 }
579
580 static const struct file_operations gru_fops = {
581 .owner = THIS_MODULE,
582 .unlocked_ioctl = gru_file_unlocked_ioctl,
583 .mmap = gru_file_mmap,
584 .llseek = noop_llseek,
585 };
586
587 static struct miscdevice gru_miscdev = {
588 .minor = MISC_DYNAMIC_MINOR,
589 .name = "gru",
590 .fops = &gru_fops,
591 };
592
593 const struct vm_operations_struct gru_vm_ops = {
594 .close = gru_vma_close,
595 .fault = gru_fault,
596 };
597
598 #ifndef MODULE
599 fs_initcall(gru_init);
600 #else
601 module_init(gru_init);
602 #endif
603 module_exit(gru_exit);
604
605 module_param(gru_options, ulong, 0644);
606 MODULE_PARM_DESC(gru_options, "Various debug options");
607
608 MODULE_AUTHOR("Silicon Graphics, Inc.");
609 MODULE_LICENSE("GPL");
610 MODULE_DESCRIPTION(GRU_DRIVER_ID_STR GRU_DRIVER_VERSION_STR);
611 MODULE_VERSION(GRU_DRIVER_VERSION_STR);
612
613