summaryrefslogtreecommitdiff
path: root/drivers/misc/sgi-gru/grufile.c
blob: a2a142ae087bfa6deb4b3c0b2f967f7e2cc890ea (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * SN Platform GRU Driver
 *
 *              FILE OPERATIONS & DRIVER INITIALIZATION
 *
 * This file supports the user system call for file open, close, mmap, etc.
 * This also incudes the driver initialization code.
 *
 *  Copyright (c) 2008-2014 Silicon Graphics, Inc.  All Rights Reserved.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/io.h>
#include <linux/spinlock.h>
#include <linux/device.h>
#include <linux/miscdevice.h>
#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include <linux/uaccess.h>
#ifdef CONFIG_X86_64
#include <asm/uv/uv_irq.h>
#endif
#include <asm/uv/uv.h>
#include "gru.h"
#include "grulib.h"
#include "grutables.h"

#include <asm/uv/uv_hub.h>
#include <asm/uv/uv_mmrs.h>

struct gru_blade_state *gru_base[GRU_MAX_BLADES] __read_mostly;
unsigned long gru_start_paddr __read_mostly;
void *gru_start_vaddr __read_mostly;
unsigned long gru_end_paddr __read_mostly;
unsigned int gru_max_gids __read_mostly;
struct gru_stats_s gru_stats;

/* Guaranteed user available resources on each node */
static int max_user_cbrs, max_user_dsr_bytes;

static struct miscdevice gru_miscdev;

static int gru_supported(void)
{
	return is_uv_system() &&
		(uv_hub_info->hub_revision < UV3_HUB_REVISION_BASE);
}

/*
 * gru_vma_close
 *
 * Called when unmapping a device mapping. Frees all gru resources
 * and tables belonging to the vma.
 */
static void gru_vma_close(struct vm_area_struct *vma)
{
	struct gru_vma_data *vdata;
	struct gru_thread_state *gts;
	struct list_head *entry, *next;

	if (!vma->vm_private_data)
		return;

	vdata = vma->vm_private_data;
	vma->vm_private_data = NULL;
	gru_dbg(grudev, "vma %p, file %p, vdata %p\n", vma, vma->vm_file,
				vdata);
	list_for_each_safe(entry, next, &vdata->vd_head) {
		gts =
		    list_entry(entry, struct gru_thread_state, ts_next);
		list_del(&gts->ts_next);
		mutex_lock(&gts->ts_ctxlock);
		if (gts->ts_gru)
			gru_unload_context(gts, 0);
		mutex_unlock(&gts->ts_ctxlock);
		gts_drop(gts);
	}
	kfree(vdata);
	STAT(vdata_free);
}

/*
 * gru_file_mmap
 *
 * Called when mmapping the device.  Initializes the vma with a fault handler
 * and private data structure necessary to allocate, track, and free the
 * underlying pages.
 */
static int gru_file_mmap(struct file *file, struct vm_area_struct *vma)
{
	if ((vma->vm_flags & (VM_SHARED | VM_WRITE)) != (VM_SHARED | VM_WRITE))
		return -EPERM;

	if (vma->vm_start & (GRU_GSEG_PAGESIZE - 1) ||
				vma->vm_end & (GRU_GSEG_PAGESIZE - 1))
		return -EINVAL;

	vma->vm_flags |= VM_IO | VM_PFNMAP | VM_LOCKED |
			 VM_DONTCOPY | VM_DONTEXPAND | VM_DONTDUMP;
	vma->vm_page_prot = PAGE_SHARED;
	vma->vm_ops = &gru_vm_ops;

	vma->vm_private_data = gru_alloc_vma_data(vma, 0);
	if (!vma->vm_private_data)
		return -ENOMEM;

	gru_dbg(grudev, "file %p, vaddr 0x%lx, vma %p, vdata %p\n",
		file, vma->vm_start, vma, vma->vm_private_data);
	return 0;
}

/*
 * Create a new GRU context
 */
static int gru_create_new_context(unsigned long arg)
{
	struct gru_create_context_req req;
	struct vm_area_struct *vma;
	struct gru_vma_data *vdata;
	int ret = -EINVAL;

	if (copy_from_user(&req, (void __user *)arg, sizeof(req)))
		return -EFAULT;

	if (req.data_segment_bytes > max_user_dsr_bytes)
		return -EINVAL;
	if (req.control_blocks > max_user_cbrs || !req.maximum_thread_count)
		return -EINVAL;

	if (!(req.options & GRU_OPT_MISS_MASK))
		req.options |= GRU_OPT_MISS_FMM_INTR;

	down_write(&current->mm->mmap_sem);
	vma = gru_find_vma(req.gseg);
	if (vma) {
		vdata = vma->vm_private_data;
		vdata->vd_user_options = req.options;
		vdata->vd_dsr_au_count =
		    GRU_DS_BYTES_TO_AU(req.data_segment_bytes);
		vdata->vd_cbr_au_count = GRU_CB_COUNT_TO_AU(req.control_blocks);
		vdata->vd_tlb_preload_count = req.tlb_preload_count;
		ret = 0;
	}
	up_write(&current->mm->mmap_sem);

	return ret;
}

/*
 * Get GRU configuration info (temp - for emulator testing)
 */
static long gru_get_config_info(unsigned long arg)
{
	struct gru_config_info info;
	int nodesperblade;

	if (num_online_nodes() > 1 &&
			(uv_node_to_blade_id(1) == uv_node_to_blade_id(0)))
		nodesperblade = 2;
	else
		nodesperblade = 1;
	memset(&info, 0, sizeof(info));
	info.cpus = num_online_cpus();
	info.nodes = num_online_nodes();
	info.blades = info.nodes / nodesperblade;
	info.chiplets = GRU_CHIPLETS_PER_BLADE * info.blades;

	if (copy_to_user((void __user *)arg, &info, sizeof(info)))
		return -EFAULT;
	return 0;
}

/*
 * gru_file_unlocked_ioctl
 *
 * Called to update file attributes via IOCTL calls.
 */
static long gru_file_unlocked_ioctl(struct file *file, unsigned int req,
				    unsigned long arg)
{
	int err = -EBADRQC;

	gru_dbg(grudev, "file %p, req 0x%x, 0x%lx\n", file, req, arg);

	switch (req) {
	case GRU_CREATE_CONTEXT:
		err = gru_create_new_context(arg);
		break;
	case GRU_SET_CONTEXT_OPTION:
		err = gru_set_context_option(arg);
		break;
	case GRU_USER_GET_EXCEPTION_DETAIL:
		err = gru_get_exception_detail(arg);
		break;
	case GRU_USER_UNLOAD_CONTEXT:
		err = gru_user_unload_context(arg);
		break;
	case GRU_USER_FLUSH_TLB:
		err = gru_user_flush_tlb(arg);
		break;
	case GRU_USER_CALL_OS:
		err = gru_handle_user_call_os(arg);
		break;
	case GRU_GET_GSEG_STATISTICS:
		err = gru_get_gseg_statistics(arg);
		break;
	case GRU_KTEST:
		err = gru_ktest(arg);
		break;
	case GRU_GET_CONFIG_INFO:
		err = gru_get_config_info(arg);
		break;
	case GRU_DUMP_CHIPLET_STATE:
		err = gru_dump_chiplet_request(arg);
		break;
	}
	return err;
}

/*
 * Called at init time to build tables for all GRUs that are present in the
 * system.
 */
static void gru_init_chiplet(struct gru_state *gru, unsigned long paddr,
			     void *vaddr, int blade_id, int chiplet_id)
{
	spin_lock_init(&gru->gs_lock);
	spin_lock_init(&gru->gs_asid_lock);
	gru->gs_gru_base_paddr = paddr;
	gru->gs_gru_base_vaddr = vaddr;
	gru->gs_gid = blade_id * GRU_CHIPLETS_PER_BLADE + chiplet_id;
	gru->gs_blade = gru_base[blade_id];
	gru->gs_blade_id = blade_id;
	gru->gs_chiplet_id = chiplet_id;
	gru->gs_cbr_map = (GRU_CBR_AU == 64) ? ~0 : (1UL << GRU_CBR_AU) - 1;
	gru->gs_dsr_map = (1UL << GRU_DSR_AU) - 1;
	gru->gs_asid_limit = MAX_ASID;
	gru_tgh_flush_init(gru);
	if (gru->gs_gid >= gru_max_gids)
		gru_max_gids = gru->gs_gid + 1;
	gru_dbg(grudev, "bid %d, gid %d, vaddr %p (0x%lx)\n",
		blade_id, gru->gs_gid, gru->gs_gru_base_vaddr,
		gru->gs_gru_base_paddr);
}

static int gru_init_tables(unsigned long gru_base_paddr, void *gru_base_vaddr)
{
	int pnode, nid, bid, chip;
	int cbrs, dsrbytes, n;
	int order = get_order(sizeof(struct gru_blade_state));
	struct page *page;
	struct gru_state *gru;
	unsigned long paddr;
	void *vaddr;

	max_user_cbrs = GRU_NUM_CB;
	max_user_dsr_bytes = GRU_NUM_DSR_BYTES;
	for_each_possible_blade(bid) {
		pnode = uv_blade_to_pnode(bid);
		nid = uv_blade_to_memory_nid(bid);/* -1 if no memory on blade */
		page = alloc_pages_node(nid, GFP_KERNEL, order);
		if (!page)
			goto fail;
		gru_base[bid] = page_address(page);
		memset(gru_base[bid], 0, sizeof(struct gru_blade_state));
		gru_base[bid]->bs_lru_gru = &gru_base[bid]->bs_grus[0];
		spin_lock_init(&gru_base[bid]->bs_lock);
		init_rwsem(&gru_base[bid]->bs_kgts_sema);

		dsrbytes = 0;
		cbrs = 0;
		for (gru = gru_base[bid]->bs_grus, chip = 0;
				chip < GRU_CHIPLETS_PER_BLADE;
				chip++, gru++) {
			paddr = gru_chiplet_paddr(gru_base_paddr, pnode, chip);
			vaddr = gru_chiplet_vaddr(gru_base_vaddr, pnode, chip);
			gru_init_chiplet(gru, paddr, vaddr, bid, chip);
			n = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE;
			cbrs = max(cbrs, n);
			n = hweight64(gru->gs_dsr_map) * GRU_DSR_AU_BYTES;
			dsrbytes = max(dsrbytes, n);
		}
		max_user_cbrs = min(max_user_cbrs, cbrs);
		max_user_dsr_bytes = min(max_user_dsr_bytes, dsrbytes);
	}

	return 0;

fail:
	for (bid--; bid >= 0; bid--)
		free_pages((unsigned long)gru_base[bid], order);
	return -ENOMEM;
}

static void gru_free_tables(void)
{
	int bid;
	int order = get_order(sizeof(struct gru_state) *
			      GRU_CHIPLETS_PER_BLADE);

	for (bid = 0; bid < GRU_MAX_BLADES; bid++)
		free_pages((unsigned long)gru_base[bid], order);
}

static unsigned long gru_chiplet_cpu_to_mmr(int chiplet, int cpu, int *corep)
{
	unsigned long mmr = 0;
	int core;

	/*
	 * We target the cores of a blade and not the hyperthreads themselves.
	 * There is a max of 8 cores per socket and 2 sockets per blade,
	 * making for a max total of 16 cores (i.e., 16 CPUs without
	 * hyperthreading and 32 CPUs with hyperthreading).
	 */
	core = uv_cpu_core_number(cpu) + UV_MAX_INT_CORES * uv_cpu_socket_number(cpu);
	if (core >= GRU_NUM_TFM || uv_cpu_ht_number(cpu))
		return 0;

	if (chiplet == 0) {
		mmr = UVH_GR0_TLB_INT0_CONFIG +
		    core * (UVH_GR0_TLB_INT1_CONFIG - UVH_GR0_TLB_INT0_CONFIG);
	} else if (chiplet == 1) {
		mmr = UVH_GR1_TLB_INT0_CONFIG +
		    core * (UVH_GR1_TLB_INT1_CONFIG - UVH_GR1_TLB_INT0_CONFIG);
	} else {
		BUG();
	}

	*corep = core;
	return mmr;
}

#ifdef CONFIG_IA64

static int gru_irq_count[GRU_CHIPLETS_PER_BLADE];

static void gru_noop(struct irq_data *d)
{
}

static struct irq_chip gru_chip[GRU_CHIPLETS_PER_BLADE] = {
	[0 ... GRU_CHIPLETS_PER_BLADE - 1] {
		.irq_mask	= gru_noop,
		.irq_unmask	= gru_noop,
		.irq_ack	= gru_noop
	}
};

static int gru_chiplet_setup_tlb_irq(int chiplet, char *irq_name,
			irq_handler_t irq_handler, int cpu, int blade)
{
	unsigned long mmr;
	int irq = IRQ_GRU + chiplet;
	int ret, core;

	mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core);
	if (mmr == 0)
		return 0;

	if (gru_irq_count[chiplet] == 0) {
		gru_chip[chiplet].name = irq_name;
		ret = irq_set_chip(irq, &gru_chip[chiplet]);
		if (ret) {
			printk(KERN_ERR "%s: set_irq_chip failed, errno=%d\n",
			       GRU_DRIVER_ID_STR, -ret);
			return ret;
		}

		ret = request_irq(irq, irq_handler, 0, irq_name, NULL);
		if (ret) {
			printk(KERN_ERR "%s: request_irq failed, errno=%d\n",
			       GRU_DRIVER_ID_STR, -ret);
			return ret;
		}
	}
	gru_irq_count[chiplet]++;

	return 0;
}

static void gru_chiplet_teardown_tlb_irq(int chiplet, int cpu, int blade)
{
	unsigned long mmr;
	int core, irq = IRQ_GRU + chiplet;

	if (gru_irq_count[chiplet] == 0)
		return;

	mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core);
	if (mmr == 0)
		return;

	if (--gru_irq_count[chiplet] == 0)
		free_irq(irq, NULL);
}

#elif defined CONFIG_X86_64

static int gru_chiplet_setup_tlb_irq(int chiplet, char *irq_name,
			irq_handler_t irq_handler, int cpu, int blade)
{
	unsigned long mmr;
	int irq, core;
	int ret;

	mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core);
	if (mmr == 0)
		return 0;

	irq = uv_setup_irq(irq_name, cpu, blade, mmr, UV_AFFINITY_CPU);
	if (irq < 0) {
		printk(KERN_ERR "%s: uv_setup_irq failed, errno=%d\n",
		       GRU_DRIVER_ID_STR, -irq);
		return irq;
	}

	ret = request_irq(irq, irq_handler, 0, irq_name, NULL);
	if (ret) {
		uv_teardown_irq(irq);
		printk(KERN_ERR "%s: request_irq failed, errno=%d\n",
		       GRU_DRIVER_ID_STR, -ret);
		return ret;
	}
	gru_base[blade]->bs_grus[chiplet].gs_irq[core] = irq;
	return 0;
}

static void gru_chiplet_teardown_tlb_irq(int chiplet, int cpu, int blade)
{
	int irq, core;
	unsigned long mmr;

	mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core);
	if (mmr) {
		irq = gru_base[blade]->bs_grus[chiplet].gs_irq[core];
		if (irq) {
			free_irq(irq, NULL);
			uv_teardown_irq(irq);
		}
	}
}

#endif

static void gru_teardown_tlb_irqs(void)
{
	int blade;
	int cpu;

	for_each_online_cpu(cpu) {
		blade = uv_cpu_to_blade_id(cpu);
		gru_chiplet_teardown_tlb_irq(0, cpu, blade);
		gru_chiplet_teardown_tlb_irq(1, cpu, blade);
	}
	for_each_possible_blade(blade) {
		if (uv_blade_nr_possible_cpus(blade))
			continue;
		gru_chiplet_teardown_tlb_irq(0, 0, blade);
		gru_chiplet_teardown_tlb_irq(1, 0, blade);
	}
}

static int gru_setup_tlb_irqs(void)
{
	int blade;
	int cpu;
	int ret;

	for_each_online_cpu(cpu) {
		blade = uv_cpu_to_blade_id(cpu);
		ret = gru_chiplet_setup_tlb_irq(0, "GRU0_TLB", gru0_intr, cpu, blade);
		if (ret != 0)
			goto exit1;

		ret = gru_chiplet_setup_tlb_irq(1, "GRU1_TLB", gru1_intr, cpu, blade);
		if (ret != 0)
			goto exit1;
	}
	for_each_possible_blade(blade) {
		if (uv_blade_nr_possible_cpus(blade))
			continue;
		ret = gru_chiplet_setup_tlb_irq(0, "GRU0_TLB", gru_intr_mblade, 0, blade);
		if (ret != 0)
			goto exit1;

		ret = gru_chiplet_setup_tlb_irq(1, "GRU1_TLB", gru_intr_mblade, 0, blade);
		if (ret != 0)
			goto exit1;
	}

	return 0;

exit1:
	gru_teardown_tlb_irqs();
	return ret;
}

/*
 * gru_init
 *
 * Called at boot or module load time to initialize the GRUs.
 */
static int __init gru_init(void)
{
	int ret;

	if (!gru_supported())
		return 0;

#if defined CONFIG_IA64
	gru_start_paddr = 0xd000000000UL; /* ZZZZZZZZZZZZZZZZZZZ fixme */
#else
	gru_start_paddr = uv_read_local_mmr(UVH_RH_GAM_GRU_OVERLAY_CONFIG_MMR) &
				0x7fffffffffffUL;
#endif
	gru_start_vaddr = __va(gru_start_paddr);
	gru_end_paddr = gru_start_paddr + GRU_MAX_BLADES * GRU_SIZE;
	printk(KERN_INFO "GRU space: 0x%lx - 0x%lx\n",
	       gru_start_paddr, gru_end_paddr);
	ret = misc_register(&gru_miscdev);
	if (ret) {
		printk(KERN_ERR "%s: misc_register failed\n",
		       GRU_DRIVER_ID_STR);
		goto exit0;
	}

	ret = gru_proc_init();
	if (ret) {
		printk(KERN_ERR "%s: proc init failed\n", GRU_DRIVER_ID_STR);
		goto exit1;
	}

	ret = gru_init_tables(gru_start_paddr, gru_start_vaddr);
	if (ret) {
		printk(KERN_ERR "%s: init tables failed\n", GRU_DRIVER_ID_STR);
		goto exit2;
	}

	ret = gru_setup_tlb_irqs();
	if (ret != 0)
		goto exit3;

	gru_kservices_init();

	printk(KERN_INFO "%s: v%s\n", GRU_DRIVER_ID_STR,
	       GRU_DRIVER_VERSION_STR);
	return 0;

exit3:
	gru_free_tables();
exit2:
	gru_proc_exit();
exit1:
	misc_deregister(&gru_miscdev);
exit0:
	return ret;

}

static void __exit gru_exit(void)
{
	if (!gru_supported())
		return;

	gru_teardown_tlb_irqs();
	gru_kservices_exit();
	gru_free_tables();
	misc_deregister(&gru_miscdev);
	gru_proc_exit();
}

static const struct file_operations gru_fops = {
	.owner		= THIS_MODULE,
	.unlocked_ioctl	= gru_file_unlocked_ioctl,
	.mmap		= gru_file_mmap,
	.llseek		= noop_llseek,
};

static struct miscdevice gru_miscdev = {
	.minor		= MISC_DYNAMIC_MINOR,
	.name		= "gru",
	.fops		= &gru_fops,
};

const struct vm_operations_struct gru_vm_ops = {
	.close		= gru_vma_close,
	.fault		= gru_fault,
};

#ifndef MODULE
fs_initcall(gru_init);
#else
module_init(gru_init);
#endif
module_exit(gru_exit);

module_param(gru_options, ulong, 0644);
MODULE_PARM_DESC(gru_options, "Various debug options");

MODULE_AUTHOR("Silicon Graphics, Inc.");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION(GRU_DRIVER_ID_STR GRU_DRIVER_VERSION_STR);
MODULE_VERSION(GRU_DRIVER_VERSION_STR);