Loading...
1/*
2 * Copyright (C) 2001-2006 Silicon Graphics, Inc. All rights
3 * reserved.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License
7 * as published by the Free Software Foundation.
8 */
9
10/*
11 * SN Platform Special Memory (mspec) Support
12 *
13 * This driver exports the SN special memory (mspec) facility to user
14 * processes.
15 * There are three types of memory made available thru this driver:
16 * fetchops, uncached and cached.
17 *
18 * Fetchops are atomic memory operations that are implemented in the
19 * memory controller on SGI SN hardware.
20 *
21 * Uncached are used for memory write combining feature of the ia64
22 * cpu.
23 *
24 * Cached are used for areas of memory that are used as cached addresses
25 * on our partition and used as uncached addresses from other partitions.
26 * Due to a design constraint of the SN2 Shub, you can not have processors
27 * on the same FSB perform both a cached and uncached reference to the
28 * same cache line. These special memory cached regions prevent the
29 * kernel from ever dropping in a TLB entry and therefore prevent the
30 * processor from ever speculating a cache line from this page.
31 */
32
33#include <linux/types.h>
34#include <linux/kernel.h>
35#include <linux/module.h>
36#include <linux/init.h>
37#include <linux/errno.h>
38#include <linux/miscdevice.h>
39#include <linux/spinlock.h>
40#include <linux/mm.h>
41#include <linux/fs.h>
42#include <linux/vmalloc.h>
43#include <linux/string.h>
44#include <linux/slab.h>
45#include <linux/numa.h>
46#include <asm/page.h>
47#include <asm/system.h>
48#include <asm/pgtable.h>
49#include <linux/atomic.h>
50#include <asm/tlbflush.h>
51#include <asm/uncached.h>
52#include <asm/sn/addrs.h>
53#include <asm/sn/arch.h>
54#include <asm/sn/mspec.h>
55#include <asm/sn/sn_cpuid.h>
56#include <asm/sn/io.h>
57#include <asm/sn/bte.h>
58#include <asm/sn/shubio.h>
59
60
61#define FETCHOP_ID "SGI Fetchop,"
62#define CACHED_ID "Cached,"
63#define UNCACHED_ID "Uncached"
64#define REVISION "4.0"
65#define MSPEC_BASENAME "mspec"
66
67/*
68 * Page types allocated by the device.
69 */
70enum mspec_page_type {
71 MSPEC_FETCHOP = 1,
72 MSPEC_CACHED,
73 MSPEC_UNCACHED
74};
75
76#ifdef CONFIG_SGI_SN
77static int is_sn2;
78#else
79#define is_sn2 0
80#endif
81
82/*
83 * One of these structures is allocated when an mspec region is mmaped. The
84 * structure is pointed to by the vma->vm_private_data field in the vma struct.
85 * This structure is used to record the addresses of the mspec pages.
86 * This structure is shared by all vma's that are split off from the
87 * original vma when split_vma()'s are done.
88 *
89 * The refcnt is incremented atomically because mm->mmap_sem does not
90 * protect in fork case where multiple tasks share the vma_data.
91 */
92struct vma_data {
93 atomic_t refcnt; /* Number of vmas sharing the data. */
94 spinlock_t lock; /* Serialize access to this structure. */
95 int count; /* Number of pages allocated. */
96 enum mspec_page_type type; /* Type of pages allocated. */
97 int flags; /* See VMD_xxx below. */
98 unsigned long vm_start; /* Original (unsplit) base. */
99 unsigned long vm_end; /* Original (unsplit) end. */
100 unsigned long maddr[0]; /* Array of MSPEC addresses. */
101};
102
103#define VMD_VMALLOCED 0x1 /* vmalloc'd rather than kmalloc'd */
104
105/* used on shub2 to clear FOP cache in the HUB */
106static unsigned long scratch_page[MAX_NUMNODES];
107#define SH2_AMO_CACHE_ENTRIES 4
108
109static inline int
110mspec_zero_block(unsigned long addr, int len)
111{
112 int status;
113
114 if (is_sn2) {
115 if (is_shub2()) {
116 int nid;
117 void *p;
118 int i;
119
120 nid = nasid_to_cnodeid(get_node_number(__pa(addr)));
121 p = (void *)TO_AMO(scratch_page[nid]);
122
123 for (i=0; i < SH2_AMO_CACHE_ENTRIES; i++) {
124 FETCHOP_LOAD_OP(p, FETCHOP_LOAD);
125 p += FETCHOP_VAR_SIZE;
126 }
127 }
128
129 status = bte_copy(0, addr & ~__IA64_UNCACHED_OFFSET, len,
130 BTE_WACQUIRE | BTE_ZERO_FILL, NULL);
131 } else {
132 memset((char *) addr, 0, len);
133 status = 0;
134 }
135 return status;
136}
137
138/*
139 * mspec_open
140 *
141 * Called when a device mapping is created by a means other than mmap
142 * (via fork, munmap, etc.). Increments the reference count on the
143 * underlying mspec data so it is not freed prematurely.
144 */
145static void
146mspec_open(struct vm_area_struct *vma)
147{
148 struct vma_data *vdata;
149
150 vdata = vma->vm_private_data;
151 atomic_inc(&vdata->refcnt);
152}
153
154/*
155 * mspec_close
156 *
157 * Called when unmapping a device mapping. Frees all mspec pages
158 * belonging to all the vma's sharing this vma_data structure.
159 */
160static void
161mspec_close(struct vm_area_struct *vma)
162{
163 struct vma_data *vdata;
164 int index, last_index;
165 unsigned long my_page;
166
167 vdata = vma->vm_private_data;
168
169 if (!atomic_dec_and_test(&vdata->refcnt))
170 return;
171
172 last_index = (vdata->vm_end - vdata->vm_start) >> PAGE_SHIFT;
173 for (index = 0; index < last_index; index++) {
174 if (vdata->maddr[index] == 0)
175 continue;
176 /*
177 * Clear the page before sticking it back
178 * into the pool.
179 */
180 my_page = vdata->maddr[index];
181 vdata->maddr[index] = 0;
182 if (!mspec_zero_block(my_page, PAGE_SIZE))
183 uncached_free_page(my_page, 1);
184 else
185 printk(KERN_WARNING "mspec_close(): "
186 "failed to zero page %ld\n", my_page);
187 }
188
189 if (vdata->flags & VMD_VMALLOCED)
190 vfree(vdata);
191 else
192 kfree(vdata);
193}
194
195/*
196 * mspec_fault
197 *
198 * Creates a mspec page and maps it to user space.
199 */
200static int
201mspec_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
202{
203 unsigned long paddr, maddr;
204 unsigned long pfn;
205 pgoff_t index = vmf->pgoff;
206 struct vma_data *vdata = vma->vm_private_data;
207
208 maddr = (volatile unsigned long) vdata->maddr[index];
209 if (maddr == 0) {
210 maddr = uncached_alloc_page(numa_node_id(), 1);
211 if (maddr == 0)
212 return VM_FAULT_OOM;
213
214 spin_lock(&vdata->lock);
215 if (vdata->maddr[index] == 0) {
216 vdata->count++;
217 vdata->maddr[index] = maddr;
218 } else {
219 uncached_free_page(maddr, 1);
220 maddr = vdata->maddr[index];
221 }
222 spin_unlock(&vdata->lock);
223 }
224
225 if (vdata->type == MSPEC_FETCHOP)
226 paddr = TO_AMO(maddr);
227 else
228 paddr = maddr & ~__IA64_UNCACHED_OFFSET;
229
230 pfn = paddr >> PAGE_SHIFT;
231
232 /*
233 * vm_insert_pfn can fail with -EBUSY, but in that case it will
234 * be because another thread has installed the pte first, so it
235 * is no problem.
236 */
237 vm_insert_pfn(vma, (unsigned long)vmf->virtual_address, pfn);
238
239 return VM_FAULT_NOPAGE;
240}
241
242static const struct vm_operations_struct mspec_vm_ops = {
243 .open = mspec_open,
244 .close = mspec_close,
245 .fault = mspec_fault,
246};
247
248/*
249 * mspec_mmap
250 *
251 * Called when mmapping the device. Initializes the vma with a fault handler
252 * and private data structure necessary to allocate, track, and free the
253 * underlying pages.
254 */
255static int
256mspec_mmap(struct file *file, struct vm_area_struct *vma,
257 enum mspec_page_type type)
258{
259 struct vma_data *vdata;
260 int pages, vdata_size, flags = 0;
261
262 if (vma->vm_pgoff != 0)
263 return -EINVAL;
264
265 if ((vma->vm_flags & VM_SHARED) == 0)
266 return -EINVAL;
267
268 if ((vma->vm_flags & VM_WRITE) == 0)
269 return -EPERM;
270
271 pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
272 vdata_size = sizeof(struct vma_data) + pages * sizeof(long);
273 if (vdata_size <= PAGE_SIZE)
274 vdata = kzalloc(vdata_size, GFP_KERNEL);
275 else {
276 vdata = vzalloc(vdata_size);
277 flags = VMD_VMALLOCED;
278 }
279 if (!vdata)
280 return -ENOMEM;
281
282 vdata->vm_start = vma->vm_start;
283 vdata->vm_end = vma->vm_end;
284 vdata->flags = flags;
285 vdata->type = type;
286 spin_lock_init(&vdata->lock);
287 vdata->refcnt = ATOMIC_INIT(1);
288 vma->vm_private_data = vdata;
289
290 vma->vm_flags |= (VM_IO | VM_RESERVED | VM_PFNMAP | VM_DONTEXPAND);
291 if (vdata->type == MSPEC_FETCHOP || vdata->type == MSPEC_UNCACHED)
292 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
293 vma->vm_ops = &mspec_vm_ops;
294
295 return 0;
296}
297
298static int
299fetchop_mmap(struct file *file, struct vm_area_struct *vma)
300{
301 return mspec_mmap(file, vma, MSPEC_FETCHOP);
302}
303
304static int
305cached_mmap(struct file *file, struct vm_area_struct *vma)
306{
307 return mspec_mmap(file, vma, MSPEC_CACHED);
308}
309
310static int
311uncached_mmap(struct file *file, struct vm_area_struct *vma)
312{
313 return mspec_mmap(file, vma, MSPEC_UNCACHED);
314}
315
316static const struct file_operations fetchop_fops = {
317 .owner = THIS_MODULE,
318 .mmap = fetchop_mmap,
319 .llseek = noop_llseek,
320};
321
322static struct miscdevice fetchop_miscdev = {
323 .minor = MISC_DYNAMIC_MINOR,
324 .name = "sgi_fetchop",
325 .fops = &fetchop_fops
326};
327
328static const struct file_operations cached_fops = {
329 .owner = THIS_MODULE,
330 .mmap = cached_mmap,
331 .llseek = noop_llseek,
332};
333
334static struct miscdevice cached_miscdev = {
335 .minor = MISC_DYNAMIC_MINOR,
336 .name = "mspec_cached",
337 .fops = &cached_fops
338};
339
340static const struct file_operations uncached_fops = {
341 .owner = THIS_MODULE,
342 .mmap = uncached_mmap,
343 .llseek = noop_llseek,
344};
345
346static struct miscdevice uncached_miscdev = {
347 .minor = MISC_DYNAMIC_MINOR,
348 .name = "mspec_uncached",
349 .fops = &uncached_fops
350};
351
352/*
353 * mspec_init
354 *
355 * Called at boot time to initialize the mspec facility.
356 */
357static int __init
358mspec_init(void)
359{
360 int ret;
361 int nid;
362
363 /*
364 * The fetchop device only works on SN2 hardware, uncached and cached
365 * memory drivers should both be valid on all ia64 hardware
366 */
367#ifdef CONFIG_SGI_SN
368 if (ia64_platform_is("sn2")) {
369 is_sn2 = 1;
370 if (is_shub2()) {
371 ret = -ENOMEM;
372 for_each_node_state(nid, N_ONLINE) {
373 int actual_nid;
374 int nasid;
375 unsigned long phys;
376
377 scratch_page[nid] = uncached_alloc_page(nid, 1);
378 if (scratch_page[nid] == 0)
379 goto free_scratch_pages;
380 phys = __pa(scratch_page[nid]);
381 nasid = get_node_number(phys);
382 actual_nid = nasid_to_cnodeid(nasid);
383 if (actual_nid != nid)
384 goto free_scratch_pages;
385 }
386 }
387
388 ret = misc_register(&fetchop_miscdev);
389 if (ret) {
390 printk(KERN_ERR
391 "%s: failed to register device %i\n",
392 FETCHOP_ID, ret);
393 goto free_scratch_pages;
394 }
395 }
396#endif
397 ret = misc_register(&cached_miscdev);
398 if (ret) {
399 printk(KERN_ERR "%s: failed to register device %i\n",
400 CACHED_ID, ret);
401 if (is_sn2)
402 misc_deregister(&fetchop_miscdev);
403 goto free_scratch_pages;
404 }
405 ret = misc_register(&uncached_miscdev);
406 if (ret) {
407 printk(KERN_ERR "%s: failed to register device %i\n",
408 UNCACHED_ID, ret);
409 misc_deregister(&cached_miscdev);
410 if (is_sn2)
411 misc_deregister(&fetchop_miscdev);
412 goto free_scratch_pages;
413 }
414
415 printk(KERN_INFO "%s %s initialized devices: %s %s %s\n",
416 MSPEC_BASENAME, REVISION, is_sn2 ? FETCHOP_ID : "",
417 CACHED_ID, UNCACHED_ID);
418
419 return 0;
420
421 free_scratch_pages:
422 for_each_node(nid) {
423 if (scratch_page[nid] != 0)
424 uncached_free_page(scratch_page[nid], 1);
425 }
426 return ret;
427}
428
429static void __exit
430mspec_exit(void)
431{
432 int nid;
433
434 misc_deregister(&uncached_miscdev);
435 misc_deregister(&cached_miscdev);
436 if (is_sn2) {
437 misc_deregister(&fetchop_miscdev);
438
439 for_each_node(nid) {
440 if (scratch_page[nid] != 0)
441 uncached_free_page(scratch_page[nid], 1);
442 }
443 }
444}
445
446module_init(mspec_init);
447module_exit(mspec_exit);
448
449MODULE_AUTHOR("Silicon Graphics, Inc. <linux-altix@sgi.com>");
450MODULE_DESCRIPTION("Driver for SGI SN special memory operations");
451MODULE_LICENSE("GPL");
1/*
2 * Copyright (C) 2001-2006 Silicon Graphics, Inc. All rights
3 * reserved.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License
7 * as published by the Free Software Foundation.
8 */
9
10/*
11 * SN Platform Special Memory (mspec) Support
12 *
13 * This driver exports the SN special memory (mspec) facility to user
14 * processes.
15 * There are three types of memory made available thru this driver:
16 * fetchops, uncached and cached.
17 *
18 * Fetchops are atomic memory operations that are implemented in the
19 * memory controller on SGI SN hardware.
20 *
21 * Uncached are used for memory write combining feature of the ia64
22 * cpu.
23 *
24 * Cached are used for areas of memory that are used as cached addresses
25 * on our partition and used as uncached addresses from other partitions.
26 * Due to a design constraint of the SN2 Shub, you can not have processors
27 * on the same FSB perform both a cached and uncached reference to the
28 * same cache line. These special memory cached regions prevent the
29 * kernel from ever dropping in a TLB entry and therefore prevent the
30 * processor from ever speculating a cache line from this page.
31 */
32
33#include <linux/types.h>
34#include <linux/kernel.h>
35#include <linux/module.h>
36#include <linux/init.h>
37#include <linux/errno.h>
38#include <linux/miscdevice.h>
39#include <linux/spinlock.h>
40#include <linux/mm.h>
41#include <linux/fs.h>
42#include <linux/vmalloc.h>
43#include <linux/string.h>
44#include <linux/slab.h>
45#include <linux/numa.h>
46#include <asm/page.h>
47#include <asm/pgtable.h>
48#include <linux/atomic.h>
49#include <asm/tlbflush.h>
50#include <asm/uncached.h>
51#include <asm/sn/addrs.h>
52#include <asm/sn/arch.h>
53#include <asm/sn/mspec.h>
54#include <asm/sn/sn_cpuid.h>
55#include <asm/sn/io.h>
56#include <asm/sn/bte.h>
57#include <asm/sn/shubio.h>
58
59
60#define FETCHOP_ID "SGI Fetchop,"
61#define CACHED_ID "Cached,"
62#define UNCACHED_ID "Uncached"
63#define REVISION "4.0"
64#define MSPEC_BASENAME "mspec"
65
66/*
67 * Page types allocated by the device.
68 */
69enum mspec_page_type {
70 MSPEC_FETCHOP = 1,
71 MSPEC_CACHED,
72 MSPEC_UNCACHED
73};
74
75#ifdef CONFIG_SGI_SN
76static int is_sn2;
77#else
78#define is_sn2 0
79#endif
80
81/*
82 * One of these structures is allocated when an mspec region is mmaped. The
83 * structure is pointed to by the vma->vm_private_data field in the vma struct.
84 * This structure is used to record the addresses of the mspec pages.
85 * This structure is shared by all vma's that are split off from the
86 * original vma when split_vma()'s are done.
87 *
88 * The refcnt is incremented atomically because mm->mmap_sem does not
89 * protect in fork case where multiple tasks share the vma_data.
90 */
91struct vma_data {
92 atomic_t refcnt; /* Number of vmas sharing the data. */
93 spinlock_t lock; /* Serialize access to this structure. */
94 int count; /* Number of pages allocated. */
95 enum mspec_page_type type; /* Type of pages allocated. */
96 int flags; /* See VMD_xxx below. */
97 unsigned long vm_start; /* Original (unsplit) base. */
98 unsigned long vm_end; /* Original (unsplit) end. */
99 unsigned long maddr[0]; /* Array of MSPEC addresses. */
100};
101
102#define VMD_VMALLOCED 0x1 /* vmalloc'd rather than kmalloc'd */
103
104/* used on shub2 to clear FOP cache in the HUB */
105static unsigned long scratch_page[MAX_NUMNODES];
106#define SH2_AMO_CACHE_ENTRIES 4
107
108static inline int
109mspec_zero_block(unsigned long addr, int len)
110{
111 int status;
112
113 if (is_sn2) {
114 if (is_shub2()) {
115 int nid;
116 void *p;
117 int i;
118
119 nid = nasid_to_cnodeid(get_node_number(__pa(addr)));
120 p = (void *)TO_AMO(scratch_page[nid]);
121
122 for (i=0; i < SH2_AMO_CACHE_ENTRIES; i++) {
123 FETCHOP_LOAD_OP(p, FETCHOP_LOAD);
124 p += FETCHOP_VAR_SIZE;
125 }
126 }
127
128 status = bte_copy(0, addr & ~__IA64_UNCACHED_OFFSET, len,
129 BTE_WACQUIRE | BTE_ZERO_FILL, NULL);
130 } else {
131 memset((char *) addr, 0, len);
132 status = 0;
133 }
134 return status;
135}
136
137/*
138 * mspec_open
139 *
140 * Called when a device mapping is created by a means other than mmap
141 * (via fork, munmap, etc.). Increments the reference count on the
142 * underlying mspec data so it is not freed prematurely.
143 */
144static void
145mspec_open(struct vm_area_struct *vma)
146{
147 struct vma_data *vdata;
148
149 vdata = vma->vm_private_data;
150 atomic_inc(&vdata->refcnt);
151}
152
153/*
154 * mspec_close
155 *
156 * Called when unmapping a device mapping. Frees all mspec pages
157 * belonging to all the vma's sharing this vma_data structure.
158 */
159static void
160mspec_close(struct vm_area_struct *vma)
161{
162 struct vma_data *vdata;
163 int index, last_index;
164 unsigned long my_page;
165
166 vdata = vma->vm_private_data;
167
168 if (!atomic_dec_and_test(&vdata->refcnt))
169 return;
170
171 last_index = (vdata->vm_end - vdata->vm_start) >> PAGE_SHIFT;
172 for (index = 0; index < last_index; index++) {
173 if (vdata->maddr[index] == 0)
174 continue;
175 /*
176 * Clear the page before sticking it back
177 * into the pool.
178 */
179 my_page = vdata->maddr[index];
180 vdata->maddr[index] = 0;
181 if (!mspec_zero_block(my_page, PAGE_SIZE))
182 uncached_free_page(my_page, 1);
183 else
184 printk(KERN_WARNING "mspec_close(): "
185 "failed to zero page %ld\n", my_page);
186 }
187
188 if (vdata->flags & VMD_VMALLOCED)
189 vfree(vdata);
190 else
191 kfree(vdata);
192}
193
194/*
195 * mspec_fault
196 *
197 * Creates a mspec page and maps it to user space.
198 */
199static int
200mspec_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
201{
202 unsigned long paddr, maddr;
203 unsigned long pfn;
204 pgoff_t index = vmf->pgoff;
205 struct vma_data *vdata = vma->vm_private_data;
206
207 maddr = (volatile unsigned long) vdata->maddr[index];
208 if (maddr == 0) {
209 maddr = uncached_alloc_page(numa_node_id(), 1);
210 if (maddr == 0)
211 return VM_FAULT_OOM;
212
213 spin_lock(&vdata->lock);
214 if (vdata->maddr[index] == 0) {
215 vdata->count++;
216 vdata->maddr[index] = maddr;
217 } else {
218 uncached_free_page(maddr, 1);
219 maddr = vdata->maddr[index];
220 }
221 spin_unlock(&vdata->lock);
222 }
223
224 if (vdata->type == MSPEC_FETCHOP)
225 paddr = TO_AMO(maddr);
226 else
227 paddr = maddr & ~__IA64_UNCACHED_OFFSET;
228
229 pfn = paddr >> PAGE_SHIFT;
230
231 /*
232 * vm_insert_pfn can fail with -EBUSY, but in that case it will
233 * be because another thread has installed the pte first, so it
234 * is no problem.
235 */
236 vm_insert_pfn(vma, (unsigned long)vmf->virtual_address, pfn);
237
238 return VM_FAULT_NOPAGE;
239}
240
241static const struct vm_operations_struct mspec_vm_ops = {
242 .open = mspec_open,
243 .close = mspec_close,
244 .fault = mspec_fault,
245};
246
247/*
248 * mspec_mmap
249 *
250 * Called when mmapping the device. Initializes the vma with a fault handler
251 * and private data structure necessary to allocate, track, and free the
252 * underlying pages.
253 */
254static int
255mspec_mmap(struct file *file, struct vm_area_struct *vma,
256 enum mspec_page_type type)
257{
258 struct vma_data *vdata;
259 int pages, vdata_size, flags = 0;
260
261 if (vma->vm_pgoff != 0)
262 return -EINVAL;
263
264 if ((vma->vm_flags & VM_SHARED) == 0)
265 return -EINVAL;
266
267 if ((vma->vm_flags & VM_WRITE) == 0)
268 return -EPERM;
269
270 pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
271 vdata_size = sizeof(struct vma_data) + pages * sizeof(long);
272 if (vdata_size <= PAGE_SIZE)
273 vdata = kzalloc(vdata_size, GFP_KERNEL);
274 else {
275 vdata = vzalloc(vdata_size);
276 flags = VMD_VMALLOCED;
277 }
278 if (!vdata)
279 return -ENOMEM;
280
281 vdata->vm_start = vma->vm_start;
282 vdata->vm_end = vma->vm_end;
283 vdata->flags = flags;
284 vdata->type = type;
285 spin_lock_init(&vdata->lock);
286 atomic_set(&vdata->refcnt, 1);
287 vma->vm_private_data = vdata;
288
289 vma->vm_flags |= (VM_IO | VM_RESERVED | VM_PFNMAP | VM_DONTEXPAND);
290 if (vdata->type == MSPEC_FETCHOP || vdata->type == MSPEC_UNCACHED)
291 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
292 vma->vm_ops = &mspec_vm_ops;
293
294 return 0;
295}
296
297static int
298fetchop_mmap(struct file *file, struct vm_area_struct *vma)
299{
300 return mspec_mmap(file, vma, MSPEC_FETCHOP);
301}
302
303static int
304cached_mmap(struct file *file, struct vm_area_struct *vma)
305{
306 return mspec_mmap(file, vma, MSPEC_CACHED);
307}
308
309static int
310uncached_mmap(struct file *file, struct vm_area_struct *vma)
311{
312 return mspec_mmap(file, vma, MSPEC_UNCACHED);
313}
314
315static const struct file_operations fetchop_fops = {
316 .owner = THIS_MODULE,
317 .mmap = fetchop_mmap,
318 .llseek = noop_llseek,
319};
320
321static struct miscdevice fetchop_miscdev = {
322 .minor = MISC_DYNAMIC_MINOR,
323 .name = "sgi_fetchop",
324 .fops = &fetchop_fops
325};
326
327static const struct file_operations cached_fops = {
328 .owner = THIS_MODULE,
329 .mmap = cached_mmap,
330 .llseek = noop_llseek,
331};
332
333static struct miscdevice cached_miscdev = {
334 .minor = MISC_DYNAMIC_MINOR,
335 .name = "mspec_cached",
336 .fops = &cached_fops
337};
338
339static const struct file_operations uncached_fops = {
340 .owner = THIS_MODULE,
341 .mmap = uncached_mmap,
342 .llseek = noop_llseek,
343};
344
345static struct miscdevice uncached_miscdev = {
346 .minor = MISC_DYNAMIC_MINOR,
347 .name = "mspec_uncached",
348 .fops = &uncached_fops
349};
350
351/*
352 * mspec_init
353 *
354 * Called at boot time to initialize the mspec facility.
355 */
356static int __init
357mspec_init(void)
358{
359 int ret;
360 int nid;
361
362 /*
363 * The fetchop device only works on SN2 hardware, uncached and cached
364 * memory drivers should both be valid on all ia64 hardware
365 */
366#ifdef CONFIG_SGI_SN
367 if (ia64_platform_is("sn2")) {
368 is_sn2 = 1;
369 if (is_shub2()) {
370 ret = -ENOMEM;
371 for_each_node_state(nid, N_ONLINE) {
372 int actual_nid;
373 int nasid;
374 unsigned long phys;
375
376 scratch_page[nid] = uncached_alloc_page(nid, 1);
377 if (scratch_page[nid] == 0)
378 goto free_scratch_pages;
379 phys = __pa(scratch_page[nid]);
380 nasid = get_node_number(phys);
381 actual_nid = nasid_to_cnodeid(nasid);
382 if (actual_nid != nid)
383 goto free_scratch_pages;
384 }
385 }
386
387 ret = misc_register(&fetchop_miscdev);
388 if (ret) {
389 printk(KERN_ERR
390 "%s: failed to register device %i\n",
391 FETCHOP_ID, ret);
392 goto free_scratch_pages;
393 }
394 }
395#endif
396 ret = misc_register(&cached_miscdev);
397 if (ret) {
398 printk(KERN_ERR "%s: failed to register device %i\n",
399 CACHED_ID, ret);
400 if (is_sn2)
401 misc_deregister(&fetchop_miscdev);
402 goto free_scratch_pages;
403 }
404 ret = misc_register(&uncached_miscdev);
405 if (ret) {
406 printk(KERN_ERR "%s: failed to register device %i\n",
407 UNCACHED_ID, ret);
408 misc_deregister(&cached_miscdev);
409 if (is_sn2)
410 misc_deregister(&fetchop_miscdev);
411 goto free_scratch_pages;
412 }
413
414 printk(KERN_INFO "%s %s initialized devices: %s %s %s\n",
415 MSPEC_BASENAME, REVISION, is_sn2 ? FETCHOP_ID : "",
416 CACHED_ID, UNCACHED_ID);
417
418 return 0;
419
420 free_scratch_pages:
421 for_each_node(nid) {
422 if (scratch_page[nid] != 0)
423 uncached_free_page(scratch_page[nid], 1);
424 }
425 return ret;
426}
427
428static void __exit
429mspec_exit(void)
430{
431 int nid;
432
433 misc_deregister(&uncached_miscdev);
434 misc_deregister(&cached_miscdev);
435 if (is_sn2) {
436 misc_deregister(&fetchop_miscdev);
437
438 for_each_node(nid) {
439 if (scratch_page[nid] != 0)
440 uncached_free_page(scratch_page[nid], 1);
441 }
442 }
443}
444
445module_init(mspec_init);
446module_exit(mspec_exit);
447
448MODULE_AUTHOR("Silicon Graphics, Inc. <linux-altix@sgi.com>");
449MODULE_DESCRIPTION("Driver for SGI SN special memory operations");
450MODULE_LICENSE("GPL");