sgi-gru: call fs_initcall() if statically linked
[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 "gru.h"
40 #include "grulib.h"
41 #include "grutables.h"
42
43 #if defined CONFIG_X86_64
44 #include <asm/genapic.h>
45 #include <asm/irq.h>
46 #define IS_UV()         is_uv_system()
47 #elif defined CONFIG_IA64
48 #include <asm/system.h>
49 #include <asm/sn/simulator.h>
50 /* temp support for running on hardware simulator */
51 #define IS_UV()         IS_MEDUSA() || ia64_platform_is("uv")
52 #else
53 #define IS_UV()         0
54 #endif
55
56 #include <asm/uv/uv_hub.h>
57 #include <asm/uv/uv_mmrs.h>
58
59 struct gru_blade_state *gru_base[GRU_MAX_BLADES] __read_mostly;
60 unsigned long gru_start_paddr, gru_end_paddr __read_mostly;
61 struct gru_stats_s gru_stats;
62
63 /* Guaranteed user available resources on each node */
64 static int max_user_cbrs, max_user_dsr_bytes;
65
66 static struct file_operations gru_fops;
67 static struct miscdevice gru_miscdev;
68
69
70 /*
71  * gru_vma_close
72  *
73  * Called when unmapping a device mapping. Frees all gru resources
74  * and tables belonging to the vma.
75  */
76 static void gru_vma_close(struct vm_area_struct *vma)
77 {
78         struct gru_vma_data *vdata;
79         struct gru_thread_state *gts;
80         struct list_head *entry, *next;
81
82         if (!vma->vm_private_data)
83                 return;
84
85         vdata = vma->vm_private_data;
86         vma->vm_private_data = NULL;
87         gru_dbg(grudev, "vma %p, file %p, vdata %p\n", vma, vma->vm_file,
88                                 vdata);
89         list_for_each_safe(entry, next, &vdata->vd_head) {
90                 gts =
91                     list_entry(entry, struct gru_thread_state, ts_next);
92                 list_del(&gts->ts_next);
93                 mutex_lock(&gts->ts_ctxlock);
94                 if (gts->ts_gru)
95                         gru_unload_context(gts, 0);
96                 mutex_unlock(&gts->ts_ctxlock);
97                 gts_drop(gts);
98         }
99         kfree(vdata);
100         STAT(vdata_free);
101 }
102
103 /*
104  * gru_file_mmap
105  *
106  * Called when mmaping the device.  Initializes the vma with a fault handler
107  * and private data structure necessary to allocate, track, and free the
108  * underlying pages.
109  */
110 static int gru_file_mmap(struct file *file, struct vm_area_struct *vma)
111 {
112         if ((vma->vm_flags & (VM_SHARED | VM_WRITE)) != (VM_SHARED | VM_WRITE))
113                 return -EPERM;
114
115         if (vma->vm_start & (GRU_GSEG_PAGESIZE - 1) ||
116                                 vma->vm_end & (GRU_GSEG_PAGESIZE - 1))
117                 return -EINVAL;
118
119         vma->vm_flags |=
120             (VM_IO | VM_DONTCOPY | VM_LOCKED | VM_DONTEXPAND | VM_PFNMAP |
121                         VM_RESERVED);
122         vma->vm_page_prot = PAGE_SHARED;
123         vma->vm_ops = &gru_vm_ops;
124
125         vma->vm_private_data = gru_alloc_vma_data(vma, 0);
126         if (!vma->vm_private_data)
127                 return -ENOMEM;
128
129         gru_dbg(grudev, "file %p, vaddr 0x%lx, vma %p, vdata %p\n",
130                 file, vma->vm_start, vma, vma->vm_private_data);
131         return 0;
132 }
133
134 /*
135  * Create a new GRU context
136  */
137 static int gru_create_new_context(unsigned long arg)
138 {
139         struct gru_create_context_req req;
140         struct vm_area_struct *vma;
141         struct gru_vma_data *vdata;
142         int ret = -EINVAL;
143
144
145         if (copy_from_user(&req, (void __user *)arg, sizeof(req)))
146                 return -EFAULT;
147
148         if (req.data_segment_bytes == 0 ||
149                                 req.data_segment_bytes > max_user_dsr_bytes)
150                 return -EINVAL;
151         if (!req.control_blocks || !req.maximum_thread_count ||
152                                 req.control_blocks > max_user_cbrs)
153                 return -EINVAL;
154
155         if (!(req.options & GRU_OPT_MISS_MASK))
156                 req.options |= GRU_OPT_MISS_FMM_INTR;
157
158         down_write(&current->mm->mmap_sem);
159         vma = gru_find_vma(req.gseg);
160         if (vma) {
161                 vdata = vma->vm_private_data;
162                 vdata->vd_user_options = req.options;
163                 vdata->vd_dsr_au_count =
164                     GRU_DS_BYTES_TO_AU(req.data_segment_bytes);
165                 vdata->vd_cbr_au_count = GRU_CB_COUNT_TO_AU(req.control_blocks);
166                 ret = 0;
167         }
168         up_write(&current->mm->mmap_sem);
169
170         return ret;
171 }
172
173 /*
174  * Get GRU configuration info (temp - for emulator testing)
175  */
176 static long gru_get_config_info(unsigned long arg)
177 {
178         struct gru_config_info info;
179         int nodesperblade;
180
181         if (num_online_nodes() > 1 &&
182                         (uv_node_to_blade_id(1) == uv_node_to_blade_id(0)))
183                 nodesperblade = 2;
184         else
185                 nodesperblade = 1;
186         info.cpus = num_online_cpus();
187         info.nodes = num_online_nodes();
188         info.blades = info.nodes / nodesperblade;
189         info.chiplets = GRU_CHIPLETS_PER_BLADE * info.blades;
190
191         if (copy_to_user((void __user *)arg, &info, sizeof(info)))
192                 return -EFAULT;
193         return 0;
194 }
195
196 /*
197  * Get GRU chiplet status
198  */
199 static long gru_get_chiplet_status(unsigned long arg)
200 {
201         struct gru_state *gru;
202         struct gru_chiplet_info info;
203
204         if (copy_from_user(&info, (void __user *)arg, sizeof(info)))
205                 return -EFAULT;
206
207         if (info.node == -1)
208                 info.node = numa_node_id();
209         if (info.node >= num_possible_nodes() ||
210                         info.chiplet >= GRU_CHIPLETS_PER_HUB ||
211                         info.node < 0 || info.chiplet < 0)
212                 return -EINVAL;
213
214         info.blade = uv_node_to_blade_id(info.node);
215         gru = get_gru(info.blade, info.chiplet);
216
217         info.total_dsr_bytes = GRU_NUM_DSR_BYTES;
218         info.total_cbr = GRU_NUM_CB;
219         info.total_user_dsr_bytes = GRU_NUM_DSR_BYTES -
220                 gru->gs_reserved_dsr_bytes;
221         info.total_user_cbr = GRU_NUM_CB - gru->gs_reserved_cbrs;
222         info.free_user_dsr_bytes = hweight64(gru->gs_dsr_map) *
223                         GRU_DSR_AU_BYTES;
224         info.free_user_cbr = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE;
225
226         if (copy_to_user((void __user *)arg, &info, sizeof(info)))
227                 return -EFAULT;
228         return 0;
229 }
230
231 /*
232  * gru_file_unlocked_ioctl
233  *
234  * Called to update file attributes via IOCTL calls.
235  */
236 static long gru_file_unlocked_ioctl(struct file *file, unsigned int req,
237                                     unsigned long arg)
238 {
239         int err = -EBADRQC;
240
241         gru_dbg(grudev, "file %p\n", file);
242
243         switch (req) {
244         case GRU_CREATE_CONTEXT:
245                 err = gru_create_new_context(arg);
246                 break;
247         case GRU_SET_TASK_SLICE:
248                 err = gru_set_task_slice(arg);
249                 break;
250         case GRU_USER_GET_EXCEPTION_DETAIL:
251                 err = gru_get_exception_detail(arg);
252                 break;
253         case GRU_USER_UNLOAD_CONTEXT:
254                 err = gru_user_unload_context(arg);
255                 break;
256         case GRU_GET_CHIPLET_STATUS:
257                 err = gru_get_chiplet_status(arg);
258                 break;
259         case GRU_USER_FLUSH_TLB:
260                 err = gru_user_flush_tlb(arg);
261                 break;
262         case GRU_USER_CALL_OS:
263                 err = gru_handle_user_call_os(arg);
264                 break;
265         case GRU_GET_CONFIG_INFO:
266                 err = gru_get_config_info(arg);
267                 break;
268         }
269         return err;
270 }
271
272 /*
273  * Called at init time to build tables for all GRUs that are present in the
274  * system.
275  */
276 static void gru_init_chiplet(struct gru_state *gru, unsigned long paddr,
277                              void *vaddr, int nid, int bid, int grunum)
278 {
279         spin_lock_init(&gru->gs_lock);
280         spin_lock_init(&gru->gs_asid_lock);
281         gru->gs_gru_base_paddr = paddr;
282         gru->gs_gru_base_vaddr = vaddr;
283         gru->gs_gid = bid * GRU_CHIPLETS_PER_BLADE + grunum;
284         gru->gs_blade = gru_base[bid];
285         gru->gs_blade_id = bid;
286         gru->gs_cbr_map = (GRU_CBR_AU == 64) ? ~0 : (1UL << GRU_CBR_AU) - 1;
287         gru->gs_dsr_map = (1UL << GRU_DSR_AU) - 1;
288         gru_tgh_flush_init(gru);
289         gru_dbg(grudev, "bid %d, nid %d, gru %x, vaddr %p (0x%lx)\n",
290                 bid, nid, gru->gs_gid, gru->gs_gru_base_vaddr,
291                 gru->gs_gru_base_paddr);
292         gru_kservices_init(gru);
293 }
294
295 static int gru_init_tables(unsigned long gru_base_paddr, void *gru_base_vaddr)
296 {
297         int pnode, nid, bid, chip;
298         int cbrs, dsrbytes, n;
299         int order = get_order(sizeof(struct gru_blade_state));
300         struct page *page;
301         struct gru_state *gru;
302         unsigned long paddr;
303         void *vaddr;
304
305         max_user_cbrs = GRU_NUM_CB;
306         max_user_dsr_bytes = GRU_NUM_DSR_BYTES;
307         for_each_online_node(nid) {
308                 bid = uv_node_to_blade_id(nid);
309                 pnode = uv_node_to_pnode(nid);
310                 if (gru_base[bid])
311                         continue;
312                 page = alloc_pages_node(nid, GFP_KERNEL, order);
313                 if (!page)
314                         goto fail;
315                 gru_base[bid] = page_address(page);
316                 memset(gru_base[bid], 0, sizeof(struct gru_blade_state));
317                 gru_base[bid]->bs_lru_gru = &gru_base[bid]->bs_grus[0];
318                 spin_lock_init(&gru_base[bid]->bs_lock);
319
320                 dsrbytes = 0;
321                 cbrs = 0;
322                 for (gru = gru_base[bid]->bs_grus, chip = 0;
323                                 chip < GRU_CHIPLETS_PER_BLADE;
324                                 chip++, gru++) {
325                         paddr = gru_chiplet_paddr(gru_base_paddr, pnode, chip);
326                         vaddr = gru_chiplet_vaddr(gru_base_vaddr, pnode, chip);
327                         gru_init_chiplet(gru, paddr, vaddr, bid, nid, chip);
328                         n = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE;
329                         cbrs = max(cbrs, n);
330                         n = hweight64(gru->gs_dsr_map) * GRU_DSR_AU_BYTES;
331                         dsrbytes = max(dsrbytes, n);
332                 }
333                 max_user_cbrs = min(max_user_cbrs, cbrs);
334                 max_user_dsr_bytes = min(max_user_dsr_bytes, dsrbytes);
335         }
336
337         return 0;
338
339 fail:
340         for (nid--; nid >= 0; nid--)
341                 free_pages((unsigned long)gru_base[nid], order);
342         return -ENOMEM;
343 }
344
345 #ifdef CONFIG_IA64
346
347 static int get_base_irq(void)
348 {
349         return IRQ_GRU;
350 }
351
352 #elif defined CONFIG_X86_64
353
354 static void noop(unsigned int irq)
355 {
356 }
357
358 static struct irq_chip gru_chip = {
359         .name           = "gru",
360         .mask           = noop,
361         .unmask         = noop,
362         .ack            = noop,
363 };
364
365 static int get_base_irq(void)
366 {
367         set_irq_chip(IRQ_GRU, &gru_chip);
368         set_irq_chip(IRQ_GRU + 1, &gru_chip);
369         return IRQ_GRU;
370 }
371 #endif
372
373 /*
374  * gru_init
375  *
376  * Called at boot or module load time to initialize the GRUs.
377  */
378 static int __init gru_init(void)
379 {
380         int ret, irq, chip;
381         char id[10];
382         void *gru_start_vaddr;
383
384         if (!IS_UV())
385                 return 0;
386
387 #if defined CONFIG_IA64
388         gru_start_paddr = 0xd000000000UL; /* ZZZZZZZZZZZZZZZZZZZ fixme */
389 #else
390         gru_start_paddr = uv_read_local_mmr(UVH_RH_GAM_GRU_OVERLAY_CONFIG_MMR) &
391                                 0x7fffffffffffUL;
392
393 #endif
394         gru_start_vaddr = __va(gru_start_paddr);
395         gru_end_paddr = gru_start_paddr + MAX_NUMNODES * GRU_SIZE;
396         printk(KERN_INFO "GRU space: 0x%lx - 0x%lx\n",
397                gru_start_paddr, gru_end_paddr);
398         irq = get_base_irq();
399         for (chip = 0; chip < GRU_CHIPLETS_PER_BLADE; chip++) {
400                 ret = request_irq(irq + chip, gru_intr, 0, id, NULL);
401                 /* TODO: fix irq handling on x86. For now ignore failures because
402                  * interrupts are not required & not yet fully supported */
403                 if (ret) {
404                         printk("!!!WARNING: GRU ignoring request failure!!!\n");
405                         ret = 0;
406                 }
407                 if (ret) {
408                         printk(KERN_ERR "%s: request_irq failed\n",
409                                GRU_DRIVER_ID_STR);
410                         goto exit1;
411                 }
412         }
413
414         ret = misc_register(&gru_miscdev);
415         if (ret) {
416                 printk(KERN_ERR "%s: misc_register failed\n",
417                        GRU_DRIVER_ID_STR);
418                 goto exit1;
419         }
420
421         ret = gru_proc_init();
422         if (ret) {
423                 printk(KERN_ERR "%s: proc init failed\n", GRU_DRIVER_ID_STR);
424                 goto exit2;
425         }
426
427         ret = gru_init_tables(gru_start_paddr, gru_start_vaddr);
428         if (ret) {
429                 printk(KERN_ERR "%s: init tables failed\n", GRU_DRIVER_ID_STR);
430                 goto exit3;
431         }
432
433         printk(KERN_INFO "%s: v%s\n", GRU_DRIVER_ID_STR,
434                GRU_DRIVER_VERSION_STR);
435         return 0;
436
437 exit3:
438         gru_proc_exit();
439 exit2:
440         misc_deregister(&gru_miscdev);
441 exit1:
442         for (--chip; chip >= 0; chip--)
443                 free_irq(irq + chip, NULL);
444         return ret;
445
446 }
447
448 static void __exit gru_exit(void)
449 {
450         int i, bid;
451         int order = get_order(sizeof(struct gru_state) *
452                               GRU_CHIPLETS_PER_BLADE);
453
454         if (!IS_UV())
455                 return;
456
457         for (i = 0; i < GRU_CHIPLETS_PER_BLADE; i++)
458                 free_irq(IRQ_GRU + i, NULL);
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 fs_initcall(gru_init);
485 module_exit(gru_exit);
486
487 module_param(gru_options, ulong, 0644);
488 MODULE_PARM_DESC(gru_options, "Various debug options");
489
490 MODULE_AUTHOR("Silicon Graphics, Inc.");
491 MODULE_LICENSE("GPL");
492 MODULE_DESCRIPTION(GRU_DRIVER_ID_STR GRU_DRIVER_VERSION_STR);
493 MODULE_VERSION(GRU_DRIVER_VERSION_STR);
494