gru: update gru kernel self tests
[linux-2.6.git] / drivers / misc / sgi-gru / grufile.c
1 /*
2  * SN Platform GRU Driver
3  *
4  *              FILE OPERATIONS & DRIVER INITIALIZATION
5  *
6  * This file supports the user system call for file open, close, mmap, etc.
7  * This also incudes the driver initialization code.
8  *
9  *  Copyright (c) 2008 Silicon Graphics, Inc.  All Rights Reserved.
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 as published by
13  *  the Free Software Foundation; either version 2 of the License, or
14  *  (at your option) any later version.
15  *
16  *  This program is distributed in the hope that it will be useful,
17  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
18  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19  *  GNU General Public License for more details.
20  *
21  *  You should have received a copy of the GNU General Public License
22  *  along with this program; if not, write to the Free Software
23  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
24  */
25
26 #include <linux/module.h>
27 #include <linux/kernel.h>
28 #include <linux/errno.h>
29 #include <linux/slab.h>
30 #include <linux/mm.h>
31 #include <linux/io.h>
32 #include <linux/smp_lock.h>
33 #include <linux/spinlock.h>
34 #include <linux/device.h>
35 #include <linux/miscdevice.h>
36 #include <linux/interrupt.h>
37 #include <linux/proc_fs.h>
38 #include <linux/uaccess.h>
39 #include <asm/uv/uv.h>
40 #include "gru.h"
41 #include "grulib.h"
42 #include "grutables.h"
43
44 #include <asm/uv/uv_hub.h>
45 #include <asm/uv/uv_mmrs.h>
46
47 struct gru_blade_state *gru_base[GRU_MAX_BLADES] __read_mostly;
48 unsigned long gru_start_paddr __read_mostly;
49 unsigned long gru_end_paddr __read_mostly;
50 unsigned int gru_max_gids __read_mostly;
51 struct gru_stats_s gru_stats;
52
53 /* Guaranteed user available resources on each node */
54 static int max_user_cbrs, max_user_dsr_bytes;
55
56 static struct file_operations gru_fops;
57 static struct miscdevice gru_miscdev;
58
59
60 /*
61  * gru_vma_close
62  *
63  * Called when unmapping a device mapping. Frees all gru resources
64  * and tables belonging to the vma.
65  */
66 static void gru_vma_close(struct vm_area_struct *vma)
67 {
68         struct gru_vma_data *vdata;
69         struct gru_thread_state *gts;
70         struct list_head *entry, *next;
71
72         if (!vma->vm_private_data)
73                 return;
74
75         vdata = vma->vm_private_data;
76         vma->vm_private_data = NULL;
77         gru_dbg(grudev, "vma %p, file %p, vdata %p\n", vma, vma->vm_file,
78                                 vdata);
79         list_for_each_safe(entry, next, &vdata->vd_head) {
80                 gts =
81                     list_entry(entry, struct gru_thread_state, ts_next);
82                 list_del(&gts->ts_next);
83                 mutex_lock(&gts->ts_ctxlock);
84                 if (gts->ts_gru)
85                         gru_unload_context(gts, 0);
86                 mutex_unlock(&gts->ts_ctxlock);
87                 gts_drop(gts);
88         }
89         kfree(vdata);
90         STAT(vdata_free);
91 }
92
93 /*
94  * gru_file_mmap
95  *
96  * Called when mmaping the device.  Initializes the vma with a fault handler
97  * and private data structure necessary to allocate, track, and free the
98  * underlying pages.
99  */
100 static int gru_file_mmap(struct file *file, struct vm_area_struct *vma)
101 {
102         if ((vma->vm_flags & (VM_SHARED | VM_WRITE)) != (VM_SHARED | VM_WRITE))
103                 return -EPERM;
104
105         if (vma->vm_start & (GRU_GSEG_PAGESIZE - 1) ||
106                                 vma->vm_end & (GRU_GSEG_PAGESIZE - 1))
107                 return -EINVAL;
108
109         vma->vm_flags |=
110             (VM_IO | VM_DONTCOPY | VM_LOCKED | VM_DONTEXPAND | VM_PFNMAP |
111                         VM_RESERVED);
112         vma->vm_page_prot = PAGE_SHARED;
113         vma->vm_ops = &gru_vm_ops;
114
115         vma->vm_private_data = gru_alloc_vma_data(vma, 0);
116         if (!vma->vm_private_data)
117                 return -ENOMEM;
118
119         gru_dbg(grudev, "file %p, vaddr 0x%lx, vma %p, vdata %p\n",
120                 file, vma->vm_start, vma, vma->vm_private_data);
121         return 0;
122 }
123
124 /*
125  * Create a new GRU context
126  */
127 static int gru_create_new_context(unsigned long arg)
128 {
129         struct gru_create_context_req req;
130         struct vm_area_struct *vma;
131         struct gru_vma_data *vdata;
132         int ret = -EINVAL;
133
134
135         if (copy_from_user(&req, (void __user *)arg, sizeof(req)))
136                 return -EFAULT;
137
138         if (req.data_segment_bytes > max_user_dsr_bytes)
139                 return -EINVAL;
140         if (req.control_blocks > max_user_cbrs || !req.maximum_thread_count)
141                 return -EINVAL;
142
143         if (!(req.options & GRU_OPT_MISS_MASK))
144                 req.options |= GRU_OPT_MISS_FMM_INTR;
145
146         down_write(&current->mm->mmap_sem);
147         vma = gru_find_vma(req.gseg);
148         if (vma) {
149                 vdata = vma->vm_private_data;
150                 vdata->vd_user_options = req.options;
151                 vdata->vd_dsr_au_count =
152                     GRU_DS_BYTES_TO_AU(req.data_segment_bytes);
153                 vdata->vd_cbr_au_count = GRU_CB_COUNT_TO_AU(req.control_blocks);
154                 ret = 0;
155         }
156         up_write(&current->mm->mmap_sem);
157
158         return ret;
159 }
160
161 /*
162  * Get GRU configuration info (temp - for emulator testing)
163  */
164 static long gru_get_config_info(unsigned long arg)
165 {
166         struct gru_config_info info;
167         int nodesperblade;
168
169         if (num_online_nodes() > 1 &&
170                         (uv_node_to_blade_id(1) == uv_node_to_blade_id(0)))
171                 nodesperblade = 2;
172         else
173                 nodesperblade = 1;
174         info.cpus = num_online_cpus();
175         info.nodes = num_online_nodes();
176         info.blades = info.nodes / nodesperblade;
177         info.chiplets = GRU_CHIPLETS_PER_BLADE * info.blades;
178
179         if (copy_to_user((void __user *)arg, &info, sizeof(info)))
180                 return -EFAULT;
181         return 0;
182 }
183
184 /*
185  * Get GRU chiplet status
186  */
187 static long gru_get_chiplet_status(unsigned long arg)
188 {
189         struct gru_state *gru;
190         struct gru_chiplet_info info;
191
192         if (copy_from_user(&info, (void __user *)arg, sizeof(info)))
193                 return -EFAULT;
194
195         if (info.node == -1)
196                 info.node = numa_node_id();
197         if (info.node >= num_possible_nodes() ||
198                         info.chiplet >= GRU_CHIPLETS_PER_HUB ||
199                         info.node < 0 || info.chiplet < 0)
200                 return -EINVAL;
201
202         info.blade = uv_node_to_blade_id(info.node);
203         gru = get_gru(info.blade, info.chiplet);
204
205         info.total_dsr_bytes = GRU_NUM_DSR_BYTES;
206         info.total_cbr = GRU_NUM_CB;
207         info.total_user_dsr_bytes = GRU_NUM_DSR_BYTES -
208                 gru->gs_reserved_dsr_bytes;
209         info.total_user_cbr = GRU_NUM_CB - gru->gs_reserved_cbrs;
210         info.free_user_dsr_bytes = hweight64(gru->gs_dsr_map) *
211                         GRU_DSR_AU_BYTES;
212         info.free_user_cbr = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE;
213
214         if (copy_to_user((void __user *)arg, &info, sizeof(info)))
215                 return -EFAULT;
216         return 0;
217 }
218
219 /*
220  * gru_file_unlocked_ioctl
221  *
222  * Called to update file attributes via IOCTL calls.
223  */
224 static long gru_file_unlocked_ioctl(struct file *file, unsigned int req,
225                                     unsigned long arg)
226 {
227         int err = -EBADRQC;
228
229         gru_dbg(grudev, "file %p\n", file);
230
231         switch (req) {
232         case GRU_CREATE_CONTEXT:
233                 err = gru_create_new_context(arg);
234                 break;
235         case GRU_SET_TASK_SLICE:
236                 err = gru_set_task_slice(arg);
237                 break;
238         case GRU_USER_GET_EXCEPTION_DETAIL:
239                 err = gru_get_exception_detail(arg);
240                 break;
241         case GRU_USER_UNLOAD_CONTEXT:
242                 err = gru_user_unload_context(arg);
243                 break;
244         case GRU_GET_CHIPLET_STATUS:
245                 err = gru_get_chiplet_status(arg);
246                 break;
247         case GRU_USER_FLUSH_TLB:
248                 err = gru_user_flush_tlb(arg);
249                 break;
250         case GRU_USER_CALL_OS:
251                 err = gru_handle_user_call_os(arg);
252                 break;
253         case GRU_KTEST:
254                 err = gru_ktest(arg);
255                 break;
256         case GRU_GET_CONFIG_INFO:
257                 err = gru_get_config_info(arg);
258                 break;
259         case GRU_DUMP_CHIPLET_STATE:
260                 err = gru_dump_chiplet_request(arg);
261                 break;
262         }
263         return err;
264 }
265
266 /*
267  * Called at init time to build tables for all GRUs that are present in the
268  * system.
269  */
270 static void gru_init_chiplet(struct gru_state *gru, unsigned long paddr,
271                              void *vaddr, int nid, int bid, int grunum)
272 {
273         spin_lock_init(&gru->gs_lock);
274         spin_lock_init(&gru->gs_asid_lock);
275         gru->gs_gru_base_paddr = paddr;
276         gru->gs_gru_base_vaddr = vaddr;
277         gru->gs_gid = bid * GRU_CHIPLETS_PER_BLADE + grunum;
278         gru->gs_blade = gru_base[bid];
279         gru->gs_blade_id = bid;
280         gru->gs_cbr_map = (GRU_CBR_AU == 64) ? ~0 : (1UL << GRU_CBR_AU) - 1;
281         gru->gs_dsr_map = (1UL << GRU_DSR_AU) - 1;
282         gru->gs_asid_limit = MAX_ASID;
283         gru_tgh_flush_init(gru);
284         if (gru->gs_gid >= gru_max_gids)
285                 gru_max_gids = gru->gs_gid + 1;
286         gru_dbg(grudev, "bid %d, nid %d, gid %d, vaddr %p (0x%lx)\n",
287                 bid, nid, gru->gs_gid, gru->gs_gru_base_vaddr,
288                 gru->gs_gru_base_paddr);
289         gru_kservices_init(gru);
290 }
291
292 static int gru_init_tables(unsigned long gru_base_paddr, void *gru_base_vaddr)
293 {
294         int pnode, nid, bid, chip;
295         int cbrs, dsrbytes, n;
296         int order = get_order(sizeof(struct gru_blade_state));
297         struct page *page;
298         struct gru_state *gru;
299         unsigned long paddr;
300         void *vaddr;
301
302         max_user_cbrs = GRU_NUM_CB;
303         max_user_dsr_bytes = GRU_NUM_DSR_BYTES;
304         for_each_online_node(nid) {
305                 bid = uv_node_to_blade_id(nid);
306                 pnode = uv_node_to_pnode(nid);
307                 if (bid < 0 || gru_base[bid])
308                         continue;
309                 page = alloc_pages_exact_node(nid, GFP_KERNEL, order);
310                 if (!page)
311                         goto fail;
312                 gru_base[bid] = page_address(page);
313                 memset(gru_base[bid], 0, sizeof(struct gru_blade_state));
314                 gru_base[bid]->bs_lru_gru = &gru_base[bid]->bs_grus[0];
315                 spin_lock_init(&gru_base[bid]->bs_lock);
316
317                 dsrbytes = 0;
318                 cbrs = 0;
319                 for (gru = gru_base[bid]->bs_grus, chip = 0;
320                                 chip < GRU_CHIPLETS_PER_BLADE;
321                                 chip++, gru++) {
322                         paddr = gru_chiplet_paddr(gru_base_paddr, pnode, chip);
323                         vaddr = gru_chiplet_vaddr(gru_base_vaddr, pnode, chip);
324                         gru_init_chiplet(gru, paddr, vaddr, nid, bid, chip);
325                         n = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE;
326                         cbrs = max(cbrs, n);
327                         n = hweight64(gru->gs_dsr_map) * GRU_DSR_AU_BYTES;
328                         dsrbytes = max(dsrbytes, n);
329                 }
330                 max_user_cbrs = min(max_user_cbrs, cbrs);
331                 max_user_dsr_bytes = min(max_user_dsr_bytes, dsrbytes);
332         }
333
334         return 0;
335
336 fail:
337         for (nid--; nid >= 0; nid--)
338                 free_pages((unsigned long)gru_base[nid], order);
339         return -ENOMEM;
340 }
341
342 #ifdef CONFIG_IA64
343
344 static int get_base_irq(void)
345 {
346         return IRQ_GRU;
347 }
348
349 #elif defined CONFIG_X86_64
350
351 static void noop(unsigned int irq)
352 {
353 }
354
355 static struct irq_chip gru_chip = {
356         .name           = "gru",
357         .mask           = noop,
358         .unmask         = noop,
359         .ack            = noop,
360 };
361
362 static int get_base_irq(void)
363 {
364         set_irq_chip(IRQ_GRU, &gru_chip);
365         set_irq_chip(IRQ_GRU + 1, &gru_chip);
366         return IRQ_GRU;
367 }
368 #endif
369
370 /*
371  * gru_init
372  *
373  * Called at boot or module load time to initialize the GRUs.
374  */
375 static int __init gru_init(void)
376 {
377         int ret, irq, chip;
378         char id[10];
379         void *gru_start_vaddr;
380
381         if (!is_uv_system())
382                 return 0;
383
384 #if defined CONFIG_IA64
385         gru_start_paddr = 0xd000000000UL; /* ZZZZZZZZZZZZZZZZZZZ fixme */
386 #else
387         gru_start_paddr = uv_read_local_mmr(UVH_RH_GAM_GRU_OVERLAY_CONFIG_MMR) &
388                                 0x7fffffffffffUL;
389 #endif
390         gru_start_vaddr = __va(gru_start_paddr);
391         gru_end_paddr = gru_start_paddr + GRU_MAX_BLADES * GRU_SIZE;
392         printk(KERN_INFO "GRU space: 0x%lx - 0x%lx\n",
393                gru_start_paddr, gru_end_paddr);
394         irq = get_base_irq();
395         for (chip = 0; chip < GRU_CHIPLETS_PER_BLADE; chip++) {
396                 ret = request_irq(irq + chip, gru_intr, 0, id, NULL);
397                 /* TODO: fix irq handling on x86. For now ignore failure because
398                  * interrupts are not required & not yet fully supported */
399                 if (ret) {
400                         printk(KERN_WARNING
401                                "!!!WARNING: GRU ignoring request failure!!!\n");
402                         ret = 0;
403                 }
404                 if (ret) {
405                         printk(KERN_ERR "%s: request_irq failed\n",
406                                GRU_DRIVER_ID_STR);
407                         goto exit1;
408                 }
409         }
410
411         ret = misc_register(&gru_miscdev);
412         if (ret) {
413                 printk(KERN_ERR "%s: misc_register failed\n",
414                        GRU_DRIVER_ID_STR);
415                 goto exit1;
416         }
417
418         ret = gru_proc_init();
419         if (ret) {
420                 printk(KERN_ERR "%s: proc init failed\n", GRU_DRIVER_ID_STR);
421                 goto exit2;
422         }
423
424         ret = gru_init_tables(gru_start_paddr, gru_start_vaddr);
425         if (ret) {
426                 printk(KERN_ERR "%s: init tables failed\n", GRU_DRIVER_ID_STR);
427                 goto exit3;
428         }
429
430         printk(KERN_INFO "%s: v%s\n", GRU_DRIVER_ID_STR,
431                GRU_DRIVER_VERSION_STR);
432         return 0;
433
434 exit3:
435         gru_proc_exit();
436 exit2:
437         misc_deregister(&gru_miscdev);
438 exit1:
439         for (--chip; chip >= 0; chip--)
440                 free_irq(irq + chip, NULL);
441         return ret;
442
443 }
444
445 static void __exit gru_exit(void)
446 {
447         int i, bid, gid;
448         int order = get_order(sizeof(struct gru_state) *
449                               GRU_CHIPLETS_PER_BLADE);
450
451         if (!is_uv_system())
452                 return;
453
454         for (i = 0; i < GRU_CHIPLETS_PER_BLADE; i++)
455                 free_irq(IRQ_GRU + i, NULL);
456
457         foreach_gid(gid)
458                 gru_kservices_exit(GID_TO_GRU(gid));
459
460         for (bid = 0; bid < GRU_MAX_BLADES; bid++)
461                 free_pages((unsigned long)gru_base[bid], order);
462
463         misc_deregister(&gru_miscdev);
464         gru_proc_exit();
465 }
466
467 static struct file_operations gru_fops = {
468         .owner          = THIS_MODULE,
469         .unlocked_ioctl = gru_file_unlocked_ioctl,
470         .mmap           = gru_file_mmap,
471 };
472
473 static struct miscdevice gru_miscdev = {
474         .minor          = MISC_DYNAMIC_MINOR,
475         .name           = "gru",
476         .fops           = &gru_fops,
477 };
478
479 struct vm_operations_struct gru_vm_ops = {
480         .close          = gru_vma_close,
481         .fault          = gru_fault,
482 };
483
484 #ifndef MODULE
485 fs_initcall(gru_init);
486 #else
487 module_init(gru_init);
488 #endif
489 module_exit(gru_exit);
490
491 module_param(gru_options, ulong, 0644);
492 MODULE_PARM_DESC(gru_options, "Various debug options");
493
494 MODULE_AUTHOR("Silicon Graphics, Inc.");
495 MODULE_LICENSE("GPL");
496 MODULE_DESCRIPTION(GRU_DRIVER_ID_STR GRU_DRIVER_VERSION_STR);
497 MODULE_VERSION(GRU_DRIVER_VERSION_STR);
498