bbefe77c67a93dd4f88ae2c5e139f2405986eb2c
[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 == 0 ||
139                                 req.data_segment_bytes > max_user_dsr_bytes)
140                 return -EINVAL;
141         if (!req.control_blocks || !req.maximum_thread_count ||
142                                 req.control_blocks > max_user_cbrs)
143                 return -EINVAL;
144
145         if (!(req.options & GRU_OPT_MISS_MASK))
146                 req.options |= GRU_OPT_MISS_FMM_INTR;
147
148         down_write(&current->mm->mmap_sem);
149         vma = gru_find_vma(req.gseg);
150         if (vma) {
151                 vdata = vma->vm_private_data;
152                 vdata->vd_user_options = req.options;
153                 vdata->vd_dsr_au_count =
154                     GRU_DS_BYTES_TO_AU(req.data_segment_bytes);
155                 vdata->vd_cbr_au_count = GRU_CB_COUNT_TO_AU(req.control_blocks);
156                 ret = 0;
157         }
158         up_write(&current->mm->mmap_sem);
159
160         return ret;
161 }
162
163 /*
164  * Get GRU configuration info (temp - for emulator testing)
165  */
166 static long gru_get_config_info(unsigned long arg)
167 {
168         struct gru_config_info info;
169         int nodesperblade;
170
171         if (num_online_nodes() > 1 &&
172                         (uv_node_to_blade_id(1) == uv_node_to_blade_id(0)))
173                 nodesperblade = 2;
174         else
175                 nodesperblade = 1;
176         info.cpus = num_online_cpus();
177         info.nodes = num_online_nodes();
178         info.blades = info.nodes / nodesperblade;
179         info.chiplets = GRU_CHIPLETS_PER_BLADE * info.blades;
180
181         if (copy_to_user((void __user *)arg, &info, sizeof(info)))
182                 return -EFAULT;
183         return 0;
184 }
185
186 /*
187  * Get GRU chiplet status
188  */
189 static long gru_get_chiplet_status(unsigned long arg)
190 {
191         struct gru_state *gru;
192         struct gru_chiplet_info info;
193
194         if (copy_from_user(&info, (void __user *)arg, sizeof(info)))
195                 return -EFAULT;
196
197         if (info.node == -1)
198                 info.node = numa_node_id();
199         if (info.node >= num_possible_nodes() ||
200                         info.chiplet >= GRU_CHIPLETS_PER_HUB ||
201                         info.node < 0 || info.chiplet < 0)
202                 return -EINVAL;
203
204         info.blade = uv_node_to_blade_id(info.node);
205         gru = get_gru(info.blade, info.chiplet);
206
207         info.total_dsr_bytes = GRU_NUM_DSR_BYTES;
208         info.total_cbr = GRU_NUM_CB;
209         info.total_user_dsr_bytes = GRU_NUM_DSR_BYTES -
210                 gru->gs_reserved_dsr_bytes;
211         info.total_user_cbr = GRU_NUM_CB - gru->gs_reserved_cbrs;
212         info.free_user_dsr_bytes = hweight64(gru->gs_dsr_map) *
213                         GRU_DSR_AU_BYTES;
214         info.free_user_cbr = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE;
215
216         if (copy_to_user((void __user *)arg, &info, sizeof(info)))
217                 return -EFAULT;
218         return 0;
219 }
220
221 /*
222  * gru_file_unlocked_ioctl
223  *
224  * Called to update file attributes via IOCTL calls.
225  */
226 static long gru_file_unlocked_ioctl(struct file *file, unsigned int req,
227                                     unsigned long arg)
228 {
229         int err = -EBADRQC;
230
231         gru_dbg(grudev, "file %p\n", file);
232
233         switch (req) {
234         case GRU_CREATE_CONTEXT:
235                 err = gru_create_new_context(arg);
236                 break;
237         case GRU_SET_TASK_SLICE:
238                 err = gru_set_task_slice(arg);
239                 break;
240         case GRU_USER_GET_EXCEPTION_DETAIL:
241                 err = gru_get_exception_detail(arg);
242                 break;
243         case GRU_USER_UNLOAD_CONTEXT:
244                 err = gru_user_unload_context(arg);
245                 break;
246         case GRU_GET_CHIPLET_STATUS:
247                 err = gru_get_chiplet_status(arg);
248                 break;
249         case GRU_USER_FLUSH_TLB:
250                 err = gru_user_flush_tlb(arg);
251                 break;
252         case GRU_USER_CALL_OS:
253                 err = gru_handle_user_call_os(arg);
254                 break;
255         case GRU_GET_CONFIG_INFO:
256                 err = gru_get_config_info(arg);
257                 break;
258         }
259         return err;
260 }
261
262 /*
263  * Called at init time to build tables for all GRUs that are present in the
264  * system.
265  */
266 static void gru_init_chiplet(struct gru_state *gru, unsigned long paddr,
267                              void *vaddr, int nid, int bid, int grunum)
268 {
269         spin_lock_init(&gru->gs_lock);
270         spin_lock_init(&gru->gs_asid_lock);
271         gru->gs_gru_base_paddr = paddr;
272         gru->gs_gru_base_vaddr = vaddr;
273         gru->gs_gid = bid * GRU_CHIPLETS_PER_BLADE + grunum;
274         gru->gs_blade = gru_base[bid];
275         gru->gs_blade_id = bid;
276         gru->gs_cbr_map = (GRU_CBR_AU == 64) ? ~0 : (1UL << GRU_CBR_AU) - 1;
277         gru->gs_dsr_map = (1UL << GRU_DSR_AU) - 1;
278         gru->gs_asid_limit = MAX_ASID;
279         gru_tgh_flush_init(gru);
280         if (gru->gs_gid >= gru_max_gids)
281                 gru_max_gids = gru->gs_gid + 1;
282         gru_dbg(grudev, "bid %d, nid %d, gid %d, vaddr %p (0x%lx)\n",
283                 bid, nid, gru->gs_gid, gru->gs_gru_base_vaddr,
284                 gru->gs_gru_base_paddr);
285         gru_kservices_init(gru);
286 }
287
288 static int gru_init_tables(unsigned long gru_base_paddr, void *gru_base_vaddr)
289 {
290         int pnode, nid, bid, chip;
291         int cbrs, dsrbytes, n;
292         int order = get_order(sizeof(struct gru_blade_state));
293         struct page *page;
294         struct gru_state *gru;
295         unsigned long paddr;
296         void *vaddr;
297
298         max_user_cbrs = GRU_NUM_CB;
299         max_user_dsr_bytes = GRU_NUM_DSR_BYTES;
300         for_each_online_node(nid) {
301                 bid = uv_node_to_blade_id(nid);
302                 pnode = uv_node_to_pnode(nid);
303                 if (bid < 0 || gru_base[bid])
304                         continue;
305                 page = alloc_pages_node(nid, GFP_KERNEL, order);
306                 if (!page)
307                         goto fail;
308                 gru_base[bid] = page_address(page);
309                 memset(gru_base[bid], 0, sizeof(struct gru_blade_state));
310                 gru_base[bid]->bs_lru_gru = &gru_base[bid]->bs_grus[0];
311                 spin_lock_init(&gru_base[bid]->bs_lock);
312
313                 dsrbytes = 0;
314                 cbrs = 0;
315                 for (gru = gru_base[bid]->bs_grus, chip = 0;
316                                 chip < GRU_CHIPLETS_PER_BLADE;
317                                 chip++, gru++) {
318                         paddr = gru_chiplet_paddr(gru_base_paddr, pnode, chip);
319                         vaddr = gru_chiplet_vaddr(gru_base_vaddr, pnode, chip);
320                         gru_init_chiplet(gru, paddr, vaddr, nid, bid, chip);
321                         n = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE;
322                         cbrs = max(cbrs, n);
323                         n = hweight64(gru->gs_dsr_map) * GRU_DSR_AU_BYTES;
324                         dsrbytes = max(dsrbytes, n);
325                 }
326                 max_user_cbrs = min(max_user_cbrs, cbrs);
327                 max_user_dsr_bytes = min(max_user_dsr_bytes, dsrbytes);
328         }
329
330         return 0;
331
332 fail:
333         for (nid--; nid >= 0; nid--)
334                 free_pages((unsigned long)gru_base[nid], order);
335         return -ENOMEM;
336 }
337
338 #ifdef CONFIG_IA64
339
340 static int get_base_irq(void)
341 {
342         return IRQ_GRU;
343 }
344
345 #elif defined CONFIG_X86_64
346
347 static void noop(unsigned int irq)
348 {
349 }
350
351 static struct irq_chip gru_chip = {
352         .name           = "gru",
353         .mask           = noop,
354         .unmask         = noop,
355         .ack            = noop,
356 };
357
358 static int get_base_irq(void)
359 {
360         set_irq_chip(IRQ_GRU, &gru_chip);
361         set_irq_chip(IRQ_GRU + 1, &gru_chip);
362         return IRQ_GRU;
363 }
364 #endif
365
366 /*
367  * gru_init
368  *
369  * Called at boot or module load time to initialize the GRUs.
370  */
371 static int __init gru_init(void)
372 {
373         int ret, irq, chip;
374         char id[10];
375         void *gru_start_vaddr;
376
377         if (!is_uv_system())
378                 return 0;
379
380 #if defined CONFIG_IA64
381         gru_start_paddr = 0xd000000000UL; /* ZZZZZZZZZZZZZZZZZZZ fixme */
382 #else
383         gru_start_paddr = uv_read_local_mmr(UVH_RH_GAM_GRU_OVERLAY_CONFIG_MMR) &
384                                 0x7fffffffffffUL;
385 #endif
386         gru_start_vaddr = __va(gru_start_paddr);
387         gru_end_paddr = gru_start_paddr + GRU_MAX_BLADES * GRU_SIZE;
388         printk(KERN_INFO "GRU space: 0x%lx - 0x%lx\n",
389                gru_start_paddr, gru_end_paddr);
390         irq = get_base_irq();
391         for (chip = 0; chip < GRU_CHIPLETS_PER_BLADE; chip++) {
392                 ret = request_irq(irq + chip, gru_intr, 0, id, NULL);
393                 /* TODO: fix irq handling on x86. For now ignore failure because
394                  * interrupts are not required & not yet fully supported */
395                 if (ret) {
396                         printk(KERN_WARNING
397                                "!!!WARNING: GRU ignoring request failure!!!\n");
398                         ret = 0;
399                 }
400                 if (ret) {
401                         printk(KERN_ERR "%s: request_irq failed\n",
402                                GRU_DRIVER_ID_STR);
403                         goto exit1;
404                 }
405         }
406
407         ret = misc_register(&gru_miscdev);
408         if (ret) {
409                 printk(KERN_ERR "%s: misc_register failed\n",
410                        GRU_DRIVER_ID_STR);
411                 goto exit1;
412         }
413
414         ret = gru_proc_init();
415         if (ret) {
416                 printk(KERN_ERR "%s: proc init failed\n", GRU_DRIVER_ID_STR);
417                 goto exit2;
418         }
419
420         ret = gru_init_tables(gru_start_paddr, gru_start_vaddr);
421         if (ret) {
422                 printk(KERN_ERR "%s: init tables failed\n", GRU_DRIVER_ID_STR);
423                 goto exit3;
424         }
425
426         printk(KERN_INFO "%s: v%s\n", GRU_DRIVER_ID_STR,
427                GRU_DRIVER_VERSION_STR);
428         return 0;
429
430 exit3:
431         gru_proc_exit();
432 exit2:
433         misc_deregister(&gru_miscdev);
434 exit1:
435         for (--chip; chip >= 0; chip--)
436                 free_irq(irq + chip, NULL);
437         return ret;
438
439 }
440
441 static void __exit gru_exit(void)
442 {
443         int i, bid, gid;
444         int order = get_order(sizeof(struct gru_state) *
445                               GRU_CHIPLETS_PER_BLADE);
446
447         if (!is_uv_system())
448                 return;
449
450         for (i = 0; i < GRU_CHIPLETS_PER_BLADE; i++)
451                 free_irq(IRQ_GRU + i, NULL);
452
453         foreach_gid(gid)
454                 gru_kservices_exit(GID_TO_GRU(gid));
455
456         for (bid = 0; bid < GRU_MAX_BLADES; bid++)
457                 free_pages((unsigned long)gru_base[bid], order);
458
459         misc_deregister(&gru_miscdev);
460         gru_proc_exit();
461 }
462
463 static struct file_operations gru_fops = {
464         .owner          = THIS_MODULE,
465         .unlocked_ioctl = gru_file_unlocked_ioctl,
466         .mmap           = gru_file_mmap,
467 };
468
469 static struct miscdevice gru_miscdev = {
470         .minor          = MISC_DYNAMIC_MINOR,
471         .name           = "gru",
472         .fops           = &gru_fops,
473 };
474
475 struct vm_operations_struct gru_vm_ops = {
476         .close          = gru_vma_close,
477         .fault          = gru_fault,
478 };
479
480 #ifndef MODULE
481 fs_initcall(gru_init);
482 #else
483 module_init(gru_init);
484 #endif
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