mm-only debug patch...
[mmotm.git] / drivers / misc / sgi-gru / grufile.c
blob41c8fe2a928c6a76967890a7467038e7df703c3c
1 /*
2 * SN Platform GRU Driver
4 * FILE OPERATIONS & DRIVER INITIALIZATION
6 * This file supports the user system call for file open, close, mmap, etc.
7 * This also incudes the driver initialization code.
9 * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
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.
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.
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
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/spinlock.h>
33 #include <linux/device.h>
34 #include <linux/miscdevice.h>
35 #include <linux/interrupt.h>
36 #include <linux/proc_fs.h>
37 #include <linux/uaccess.h>
38 #include <asm/uv/uv.h>
39 #include "gru.h"
40 #include "grulib.h"
41 #include "grutables.h"
43 #include <asm/uv/uv_hub.h>
44 #include <asm/uv/uv_mmrs.h>
46 struct gru_blade_state *gru_base[GRU_MAX_BLADES] __read_mostly;
47 unsigned long gru_start_paddr __read_mostly;
48 void *gru_start_vaddr __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;
53 /* Guaranteed user available resources on each node */
54 static int max_user_cbrs, max_user_dsr_bytes;
56 static struct miscdevice gru_miscdev;
60 * gru_vma_close
62 * Called when unmapping a device mapping. Frees all gru resources
63 * and tables belonging to the vma.
65 static void gru_vma_close(struct vm_area_struct *vma)
67 struct gru_vma_data *vdata;
68 struct gru_thread_state *gts;
69 struct list_head *entry, *next;
71 if (!vma->vm_private_data)
72 return;
74 vdata = vma->vm_private_data;
75 vma->vm_private_data = NULL;
76 gru_dbg(grudev, "vma %p, file %p, vdata %p\n", vma, vma->vm_file,
77 vdata);
78 list_for_each_safe(entry, next, &vdata->vd_head) {
79 gts =
80 list_entry(entry, struct gru_thread_state, ts_next);
81 list_del(&gts->ts_next);
82 mutex_lock(&gts->ts_ctxlock);
83 if (gts->ts_gru)
84 gru_unload_context(gts, 0);
85 mutex_unlock(&gts->ts_ctxlock);
86 gts_drop(gts);
88 kfree(vdata);
89 STAT(vdata_free);
93 * gru_file_mmap
95 * Called when mmaping the device. Initializes the vma with a fault handler
96 * and private data structure necessary to allocate, track, and free the
97 * underlying pages.
99 static int gru_file_mmap(struct file *file, struct vm_area_struct *vma)
101 if ((vma->vm_flags & (VM_SHARED | VM_WRITE)) != (VM_SHARED | VM_WRITE))
102 return -EPERM;
104 if (vma->vm_start & (GRU_GSEG_PAGESIZE - 1) ||
105 vma->vm_end & (GRU_GSEG_PAGESIZE - 1))
106 return -EINVAL;
108 vma->vm_flags |=
109 (VM_IO | VM_DONTCOPY | VM_LOCKED | VM_DONTEXPAND | VM_PFNMAP |
110 VM_RESERVED);
111 vma->vm_page_prot = PAGE_SHARED;
112 vma->vm_ops = &gru_vm_ops;
114 vma->vm_private_data = gru_alloc_vma_data(vma, 0);
115 if (!vma->vm_private_data)
116 return -ENOMEM;
118 gru_dbg(grudev, "file %p, vaddr 0x%lx, vma %p, vdata %p\n",
119 file, vma->vm_start, vma, vma->vm_private_data);
120 return 0;
124 * Create a new GRU context
126 static int gru_create_new_context(unsigned long arg)
128 struct gru_create_context_req req;
129 struct vm_area_struct *vma;
130 struct gru_vma_data *vdata;
131 int ret = -EINVAL;
134 if (copy_from_user(&req, (void __user *)arg, sizeof(req)))
135 return -EFAULT;
137 if (req.data_segment_bytes > max_user_dsr_bytes)
138 return -EINVAL;
139 if (req.control_blocks > max_user_cbrs || !req.maximum_thread_count)
140 return -EINVAL;
142 if (!(req.options & GRU_OPT_MISS_MASK))
143 req.options |= GRU_OPT_MISS_FMM_INTR;
145 down_write(&current->mm->mmap_sem);
146 vma = gru_find_vma(req.gseg);
147 if (vma) {
148 vdata = vma->vm_private_data;
149 vdata->vd_user_options = req.options;
150 vdata->vd_dsr_au_count =
151 GRU_DS_BYTES_TO_AU(req.data_segment_bytes);
152 vdata->vd_cbr_au_count = GRU_CB_COUNT_TO_AU(req.control_blocks);
153 ret = 0;
155 up_write(&current->mm->mmap_sem);
157 return ret;
161 * Get GRU configuration info (temp - for emulator testing)
163 static long gru_get_config_info(unsigned long arg)
165 struct gru_config_info info;
166 int nodesperblade;
168 if (num_online_nodes() > 1 &&
169 (uv_node_to_blade_id(1) == uv_node_to_blade_id(0)))
170 nodesperblade = 2;
171 else
172 nodesperblade = 1;
173 info.cpus = num_online_cpus();
174 info.nodes = num_online_nodes();
175 info.blades = info.nodes / nodesperblade;
176 info.chiplets = GRU_CHIPLETS_PER_BLADE * info.blades;
178 if (copy_to_user((void __user *)arg, &info, sizeof(info)))
179 return -EFAULT;
180 return 0;
184 * gru_file_unlocked_ioctl
186 * Called to update file attributes via IOCTL calls.
188 static long gru_file_unlocked_ioctl(struct file *file, unsigned int req,
189 unsigned long arg)
191 int err = -EBADRQC;
193 gru_dbg(grudev, "file %p\n", file);
195 switch (req) {
196 case GRU_CREATE_CONTEXT:
197 err = gru_create_new_context(arg);
198 break;
199 case GRU_SET_CONTEXT_OPTION:
200 err = gru_set_context_option(arg);
201 break;
202 case GRU_USER_GET_EXCEPTION_DETAIL:
203 err = gru_get_exception_detail(arg);
204 break;
205 case GRU_USER_UNLOAD_CONTEXT:
206 err = gru_user_unload_context(arg);
207 break;
208 case GRU_USER_FLUSH_TLB:
209 err = gru_user_flush_tlb(arg);
210 break;
211 case GRU_USER_CALL_OS:
212 err = gru_handle_user_call_os(arg);
213 break;
214 case GRU_GET_GSEG_STATISTICS:
215 err = gru_get_gseg_statistics(arg);
216 break;
217 case GRU_KTEST:
218 err = gru_ktest(arg);
219 break;
220 case GRU_GET_CONFIG_INFO:
221 err = gru_get_config_info(arg);
222 break;
223 case GRU_DUMP_CHIPLET_STATE:
224 err = gru_dump_chiplet_request(arg);
225 break;
227 return err;
231 * Called at init time to build tables for all GRUs that are present in the
232 * system.
234 static void gru_init_chiplet(struct gru_state *gru, unsigned long paddr,
235 void *vaddr, int nid, int bid, int grunum)
237 spin_lock_init(&gru->gs_lock);
238 spin_lock_init(&gru->gs_asid_lock);
239 gru->gs_gru_base_paddr = paddr;
240 gru->gs_gru_base_vaddr = vaddr;
241 gru->gs_gid = bid * GRU_CHIPLETS_PER_BLADE + grunum;
242 gru->gs_blade = gru_base[bid];
243 gru->gs_blade_id = bid;
244 gru->gs_cbr_map = (GRU_CBR_AU == 64) ? ~0 : (1UL << GRU_CBR_AU) - 1;
245 gru->gs_dsr_map = (1UL << GRU_DSR_AU) - 1;
246 gru->gs_asid_limit = MAX_ASID;
247 gru_tgh_flush_init(gru);
248 if (gru->gs_gid >= gru_max_gids)
249 gru_max_gids = gru->gs_gid + 1;
250 gru_dbg(grudev, "bid %d, nid %d, gid %d, vaddr %p (0x%lx)\n",
251 bid, nid, gru->gs_gid, gru->gs_gru_base_vaddr,
252 gru->gs_gru_base_paddr);
255 static int gru_init_tables(unsigned long gru_base_paddr, void *gru_base_vaddr)
257 int pnode, nid, bid, chip;
258 int cbrs, dsrbytes, n;
259 int order = get_order(sizeof(struct gru_blade_state));
260 struct page *page;
261 struct gru_state *gru;
262 unsigned long paddr;
263 void *vaddr;
265 max_user_cbrs = GRU_NUM_CB;
266 max_user_dsr_bytes = GRU_NUM_DSR_BYTES;
267 for_each_online_node(nid) {
268 bid = uv_node_to_blade_id(nid);
269 pnode = uv_node_to_pnode(nid);
270 if (bid < 0 || gru_base[bid])
271 continue;
272 page = alloc_pages_exact_node(nid, GFP_KERNEL, order);
273 if (!page)
274 goto fail;
275 gru_base[bid] = page_address(page);
276 memset(gru_base[bid], 0, sizeof(struct gru_blade_state));
277 gru_base[bid]->bs_lru_gru = &gru_base[bid]->bs_grus[0];
278 spin_lock_init(&gru_base[bid]->bs_lock);
279 init_rwsem(&gru_base[bid]->bs_kgts_sema);
281 dsrbytes = 0;
282 cbrs = 0;
283 for (gru = gru_base[bid]->bs_grus, chip = 0;
284 chip < GRU_CHIPLETS_PER_BLADE;
285 chip++, gru++) {
286 paddr = gru_chiplet_paddr(gru_base_paddr, pnode, chip);
287 vaddr = gru_chiplet_vaddr(gru_base_vaddr, pnode, chip);
288 gru_init_chiplet(gru, paddr, vaddr, nid, bid, chip);
289 n = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE;
290 cbrs = max(cbrs, n);
291 n = hweight64(gru->gs_dsr_map) * GRU_DSR_AU_BYTES;
292 dsrbytes = max(dsrbytes, n);
294 max_user_cbrs = min(max_user_cbrs, cbrs);
295 max_user_dsr_bytes = min(max_user_dsr_bytes, dsrbytes);
298 return 0;
300 fail:
301 for (nid--; nid >= 0; nid--)
302 free_pages((unsigned long)gru_base[nid], order);
303 return -ENOMEM;
306 #ifdef CONFIG_IA64
308 static int get_base_irq(void)
310 return IRQ_GRU;
313 #elif defined CONFIG_X86_64
315 static void noop(unsigned int irq)
319 static struct irq_chip gru_chip = {
320 .name = "gru",
321 .mask = noop,
322 .unmask = noop,
323 .ack = noop,
326 static int get_base_irq(void)
328 set_irq_chip(IRQ_GRU, &gru_chip);
329 set_irq_chip(IRQ_GRU + 1, &gru_chip);
330 return IRQ_GRU;
332 #endif
335 * gru_init
337 * Called at boot or module load time to initialize the GRUs.
339 static int __init gru_init(void)
341 int ret, irq, chip;
342 char id[10];
344 if (!is_uv_system())
345 return 0;
347 #if defined CONFIG_IA64
348 gru_start_paddr = 0xd000000000UL; /* ZZZZZZZZZZZZZZZZZZZ fixme */
349 #else
350 gru_start_paddr = uv_read_local_mmr(UVH_RH_GAM_GRU_OVERLAY_CONFIG_MMR) &
351 0x7fffffffffffUL;
352 #endif
353 gru_start_vaddr = __va(gru_start_paddr);
354 gru_end_paddr = gru_start_paddr + GRU_MAX_BLADES * GRU_SIZE;
355 printk(KERN_INFO "GRU space: 0x%lx - 0x%lx\n",
356 gru_start_paddr, gru_end_paddr);
357 irq = get_base_irq();
358 for (chip = 0; chip < GRU_CHIPLETS_PER_BLADE; chip++) {
359 ret = request_irq(irq + chip, gru_intr, 0, id, NULL);
360 /* TODO: fix irq handling on x86. For now ignore failure because
361 * interrupts are not required & not yet fully supported */
362 if (ret) {
363 printk(KERN_WARNING
364 "!!!WARNING: GRU ignoring request failure!!!\n");
365 ret = 0;
367 if (ret) {
368 printk(KERN_ERR "%s: request_irq failed\n",
369 GRU_DRIVER_ID_STR);
370 goto exit1;
374 ret = misc_register(&gru_miscdev);
375 if (ret) {
376 printk(KERN_ERR "%s: misc_register failed\n",
377 GRU_DRIVER_ID_STR);
378 goto exit1;
381 ret = gru_proc_init();
382 if (ret) {
383 printk(KERN_ERR "%s: proc init failed\n", GRU_DRIVER_ID_STR);
384 goto exit2;
387 ret = gru_init_tables(gru_start_paddr, gru_start_vaddr);
388 if (ret) {
389 printk(KERN_ERR "%s: init tables failed\n", GRU_DRIVER_ID_STR);
390 goto exit3;
392 gru_kservices_init();
394 printk(KERN_INFO "%s: v%s\n", GRU_DRIVER_ID_STR,
395 GRU_DRIVER_VERSION_STR);
396 return 0;
398 exit3:
399 gru_proc_exit();
400 exit2:
401 misc_deregister(&gru_miscdev);
402 exit1:
403 for (--chip; chip >= 0; chip--)
404 free_irq(irq + chip, NULL);
405 return ret;
409 static void __exit gru_exit(void)
411 int i, bid;
412 int order = get_order(sizeof(struct gru_state) *
413 GRU_CHIPLETS_PER_BLADE);
415 if (!is_uv_system())
416 return;
418 for (i = 0; i < GRU_CHIPLETS_PER_BLADE; i++)
419 free_irq(IRQ_GRU + i, NULL);
420 gru_kservices_exit();
421 for (bid = 0; bid < GRU_MAX_BLADES; bid++)
422 free_pages((unsigned long)gru_base[bid], order);
424 misc_deregister(&gru_miscdev);
425 gru_proc_exit();
428 static const struct file_operations gru_fops = {
429 .owner = THIS_MODULE,
430 .unlocked_ioctl = gru_file_unlocked_ioctl,
431 .mmap = gru_file_mmap,
434 static struct miscdevice gru_miscdev = {
435 .minor = MISC_DYNAMIC_MINOR,
436 .name = "gru",
437 .fops = &gru_fops,
440 const struct vm_operations_struct gru_vm_ops = {
441 .close = gru_vma_close,
442 .fault = gru_fault,
445 #ifndef MODULE
446 fs_initcall(gru_init);
447 #else
448 module_init(gru_init);
449 #endif
450 module_exit(gru_exit);
452 module_param(gru_options, ulong, 0644);
453 MODULE_PARM_DESC(gru_options, "Various debug options");
455 MODULE_AUTHOR("Silicon Graphics, Inc.");
456 MODULE_LICENSE("GPL");
457 MODULE_DESCRIPTION(GRU_DRIVER_ID_STR GRU_DRIVER_VERSION_STR);
458 MODULE_VERSION(GRU_DRIVER_VERSION_STR);