xref: /openbmc/linux/drivers/misc/sgi-gru/grufile.c (revision 9ac8d3fb)
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 module_init(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 
495