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>
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>
42 #include "grutables.h"
44 #include <asm/uv/uv_hub.h>
45 #include <asm/uv/uv_mmrs.h>
47 struct gru_blade_state *gru_base[GRU_MAX_BLADES] __read_mostly;
48 unsigned long gru_start_paddr, gru_end_paddr __read_mostly;
49 struct gru_stats_s gru_stats;
51 /* Guaranteed user available resources on each node */
52 static int max_user_cbrs, max_user_dsr_bytes;
54 static struct file_operations gru_fops;
55 static struct miscdevice gru_miscdev;
61 * Called when unmapping a device mapping. Frees all gru resources
62 * and tables belonging to the vma.
64 static void gru_vma_close(struct vm_area_struct *vma)
66 struct gru_vma_data *vdata;
67 struct gru_thread_state *gts;
68 struct list_head *entry, *next;
70 if (!vma->vm_private_data)
73 vdata = vma->vm_private_data;
74 vma->vm_private_data = NULL;
75 gru_dbg(grudev, "vma %p, file %p, vdata %p\n", vma, vma->vm_file,
77 list_for_each_safe(entry, next, &vdata->vd_head) {
79 list_entry(entry, struct gru_thread_state, ts_next);
80 list_del(>s->ts_next);
81 mutex_lock(>s->ts_ctxlock);
83 gru_unload_context(gts, 0);
84 mutex_unlock(>s->ts_ctxlock);
94 * Called when mmaping the device. Initializes the vma with a fault handler
95 * and private data structure necessary to allocate, track, and free the
98 static int gru_file_mmap(struct file *file, struct vm_area_struct *vma)
100 if ((vma->vm_flags & (VM_SHARED | VM_WRITE)) != (VM_SHARED | VM_WRITE))
103 if (vma->vm_start & (GRU_GSEG_PAGESIZE - 1) ||
104 vma->vm_end & (GRU_GSEG_PAGESIZE - 1))
108 (VM_IO | VM_DONTCOPY | VM_LOCKED | VM_DONTEXPAND | VM_PFNMAP |
110 vma->vm_page_prot = PAGE_SHARED;
111 vma->vm_ops = &gru_vm_ops;
113 vma->vm_private_data = gru_alloc_vma_data(vma, 0);
114 if (!vma->vm_private_data)
117 gru_dbg(grudev, "file %p, vaddr 0x%lx, vma %p, vdata %p\n",
118 file, vma->vm_start, vma, vma->vm_private_data);
123 * Create a new GRU context
125 static int gru_create_new_context(unsigned long arg)
127 struct gru_create_context_req req;
128 struct vm_area_struct *vma;
129 struct gru_vma_data *vdata;
133 if (copy_from_user(&req, (void __user *)arg, sizeof(req)))
136 if (req.data_segment_bytes == 0 ||
137 req.data_segment_bytes > max_user_dsr_bytes)
139 if (!req.control_blocks || !req.maximum_thread_count ||
140 req.control_blocks > max_user_cbrs)
143 if (!(req.options & GRU_OPT_MISS_MASK))
144 req.options |= GRU_OPT_MISS_FMM_INTR;
146 down_write(¤t->mm->mmap_sem);
147 vma = gru_find_vma(req.gseg);
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);
156 up_write(¤t->mm->mmap_sem);
162 * Get GRU configuration info (temp - for emulator testing)
164 static long gru_get_config_info(unsigned long arg)
166 struct gru_config_info info;
169 if (num_online_nodes() > 1 &&
170 (uv_node_to_blade_id(1) == uv_node_to_blade_id(0)))
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;
179 if (copy_to_user((void __user *)arg, &info, sizeof(info)))
185 * Get GRU chiplet status
187 static long gru_get_chiplet_status(unsigned long arg)
189 struct gru_state *gru;
190 struct gru_chiplet_info info;
192 if (copy_from_user(&info, (void __user *)arg, sizeof(info)))
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)
202 info.blade = uv_node_to_blade_id(info.node);
203 gru = get_gru(info.blade, info.chiplet);
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) *
212 info.free_user_cbr = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE;
214 if (copy_to_user((void __user *)arg, &info, sizeof(info)))
220 * gru_file_unlocked_ioctl
222 * Called to update file attributes via IOCTL calls.
224 static long gru_file_unlocked_ioctl(struct file *file, unsigned int req,
229 gru_dbg(grudev, "file %p\n", file);
232 case GRU_CREATE_CONTEXT:
233 err = gru_create_new_context(arg);
235 case GRU_SET_TASK_SLICE:
236 err = gru_set_task_slice(arg);
238 case GRU_USER_GET_EXCEPTION_DETAIL:
239 err = gru_get_exception_detail(arg);
241 case GRU_USER_UNLOAD_CONTEXT:
242 err = gru_user_unload_context(arg);
244 case GRU_GET_CHIPLET_STATUS:
245 err = gru_get_chiplet_status(arg);
247 case GRU_USER_FLUSH_TLB:
248 err = gru_user_flush_tlb(arg);
250 case GRU_USER_CALL_OS:
251 err = gru_handle_user_call_os(arg);
253 case GRU_GET_CONFIG_INFO:
254 err = gru_get_config_info(arg);
261 * Called at init time to build tables for all GRUs that are present in the
264 static void gru_init_chiplet(struct gru_state *gru, unsigned long paddr,
265 void *vaddr, int nid, int bid, int grunum)
267 spin_lock_init(&gru->gs_lock);
268 spin_lock_init(&gru->gs_asid_lock);
269 gru->gs_gru_base_paddr = paddr;
270 gru->gs_gru_base_vaddr = vaddr;
271 gru->gs_gid = bid * GRU_CHIPLETS_PER_BLADE + grunum;
272 gru->gs_blade = gru_base[bid];
273 gru->gs_blade_id = bid;
274 gru->gs_cbr_map = (GRU_CBR_AU == 64) ? ~0 : (1UL << GRU_CBR_AU) - 1;
275 gru->gs_dsr_map = (1UL << GRU_DSR_AU) - 1;
276 gru_tgh_flush_init(gru);
277 gru_dbg(grudev, "bid %d, nid %d, gru %x, vaddr %p (0x%lx)\n",
278 bid, nid, gru->gs_gid, gru->gs_gru_base_vaddr,
279 gru->gs_gru_base_paddr);
280 gru_kservices_init(gru);
283 static int gru_init_tables(unsigned long gru_base_paddr, void *gru_base_vaddr)
285 int pnode, nid, bid, chip;
286 int cbrs, dsrbytes, n;
287 int order = get_order(sizeof(struct gru_blade_state));
289 struct gru_state *gru;
293 max_user_cbrs = GRU_NUM_CB;
294 max_user_dsr_bytes = GRU_NUM_DSR_BYTES;
295 for_each_online_node(nid) {
296 bid = uv_node_to_blade_id(nid);
297 pnode = uv_node_to_pnode(nid);
300 page = alloc_pages_node(nid, GFP_KERNEL, order);
303 gru_base[bid] = page_address(page);
304 memset(gru_base[bid], 0, sizeof(struct gru_blade_state));
305 gru_base[bid]->bs_lru_gru = &gru_base[bid]->bs_grus[0];
306 spin_lock_init(&gru_base[bid]->bs_lock);
310 for (gru = gru_base[bid]->bs_grus, chip = 0;
311 chip < GRU_CHIPLETS_PER_BLADE;
313 paddr = gru_chiplet_paddr(gru_base_paddr, pnode, chip);
314 vaddr = gru_chiplet_vaddr(gru_base_vaddr, pnode, chip);
315 gru_init_chiplet(gru, paddr, vaddr, bid, nid, chip);
316 n = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE;
318 n = hweight64(gru->gs_dsr_map) * GRU_DSR_AU_BYTES;
319 dsrbytes = max(dsrbytes, n);
321 max_user_cbrs = min(max_user_cbrs, cbrs);
322 max_user_dsr_bytes = min(max_user_dsr_bytes, dsrbytes);
328 for (nid--; nid >= 0; nid--)
329 free_pages((unsigned long)gru_base[nid], order);
335 static int get_base_irq(void)
340 #elif defined CONFIG_X86_64
342 static void noop(unsigned int irq)
346 static struct irq_chip gru_chip = {
353 static int get_base_irq(void)
355 set_irq_chip(IRQ_GRU, &gru_chip);
356 set_irq_chip(IRQ_GRU + 1, &gru_chip);
364 * Called at boot or module load time to initialize the GRUs.
366 static int __init gru_init(void)
370 void *gru_start_vaddr;
375 #if defined CONFIG_IA64
376 gru_start_paddr = 0xd000000000UL; /* ZZZZZZZZZZZZZZZZZZZ fixme */
378 gru_start_paddr = uv_read_local_mmr(UVH_RH_GAM_GRU_OVERLAY_CONFIG_MMR) &
382 gru_start_vaddr = __va(gru_start_paddr);
383 gru_end_paddr = gru_start_paddr + MAX_NUMNODES * GRU_SIZE;
384 printk(KERN_INFO "GRU space: 0x%lx - 0x%lx\n",
385 gru_start_paddr, gru_end_paddr);
386 irq = get_base_irq();
387 for (chip = 0; chip < GRU_CHIPLETS_PER_BLADE; chip++) {
388 ret = request_irq(irq + chip, gru_intr, 0, id, NULL);
389 /* TODO: fix irq handling on x86. For now ignore failures because
390 * interrupts are not required & not yet fully supported */
392 printk("!!!WARNING: GRU ignoring request failure!!!\n");
396 printk(KERN_ERR "%s: request_irq failed\n",
402 ret = misc_register(&gru_miscdev);
404 printk(KERN_ERR "%s: misc_register failed\n",
409 ret = gru_proc_init();
411 printk(KERN_ERR "%s: proc init failed\n", GRU_DRIVER_ID_STR);
415 ret = gru_init_tables(gru_start_paddr, gru_start_vaddr);
417 printk(KERN_ERR "%s: init tables failed\n", GRU_DRIVER_ID_STR);
421 printk(KERN_INFO "%s: v%s\n", GRU_DRIVER_ID_STR,
422 GRU_DRIVER_VERSION_STR);
428 misc_deregister(&gru_miscdev);
430 for (--chip; chip >= 0; chip--)
431 free_irq(irq + chip, NULL);
436 static void __exit gru_exit(void)
439 int order = get_order(sizeof(struct gru_state) *
440 GRU_CHIPLETS_PER_BLADE);
445 for (i = 0; i < GRU_CHIPLETS_PER_BLADE; i++)
446 free_irq(IRQ_GRU + i, NULL);
448 for (bid = 0; bid < GRU_MAX_BLADES; bid++)
449 free_pages((unsigned long)gru_base[bid], order);
451 misc_deregister(&gru_miscdev);
455 static struct file_operations gru_fops = {
456 .owner = THIS_MODULE,
457 .unlocked_ioctl = gru_file_unlocked_ioctl,
458 .mmap = gru_file_mmap,
461 static struct miscdevice gru_miscdev = {
462 .minor = MISC_DYNAMIC_MINOR,
467 struct vm_operations_struct gru_vm_ops = {
468 .close = gru_vma_close,
472 fs_initcall(gru_init);
473 module_exit(gru_exit);
475 module_param(gru_options, ulong, 0644);
476 MODULE_PARM_DESC(gru_options, "Various debug options");
478 MODULE_AUTHOR("Silicon Graphics, Inc.");
479 MODULE_LICENSE("GPL");
480 MODULE_DESCRIPTION(GRU_DRIVER_ID_STR GRU_DRIVER_VERSION_STR);
481 MODULE_VERSION(GRU_DRIVER_VERSION_STR);