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2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771 
 kernel/drivers/char/mspec.c
....@@ -1,10 +1,7 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * Copyright (C) 2001-2006 Silicon Graphics, Inc.  All rights
34  * 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.
85  */
96 
107 /*
....@@ -12,11 +9,8 @@
129  *
1310  * This driver exports the SN special memory (mspec) facility to user
1411  * 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.
12
+ * There are two types of memory made available thru this driver:
13
+ * uncached and cached.
2014  *
2115  * Uncached are used for memory write combining feature of the ia64
2216  * cpu.
....@@ -45,20 +39,11 @@
4539 #include <linux/numa.h>
4640 #include <linux/refcount.h>
4741 #include <asm/page.h>
48
-#include <asm/pgtable.h>
4942 #include <linux/atomic.h>
5043 #include <asm/tlbflush.h>
5144 #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>
5945 
6046 
61
-#define FETCHOP_ID	"SGI Fetchop,"
6247 #define CACHED_ID	"Cached,"
6348 #define UNCACHED_ID	"Uncached"
6449 #define REVISION	"4.0"
....@@ -68,16 +53,9 @@
6853  * Page types allocated by the device.
6954  */
7055 enum mspec_page_type {
71
-	MSPEC_FETCHOP = 1,
72
-	MSPEC_CACHED,
56
+	MSPEC_CACHED = 2,
7357 	MSPEC_UNCACHED
7458 };
75
-
76
-#ifdef CONFIG_SGI_SN
77
-static int is_sn2;
78
-#else
79
-#define is_sn2		0
80
-#endif
8159 
8260 /*
8361  * One of these structures is allocated when an mspec region is mmaped. The
....@@ -86,7 +64,7 @@
8664  * This structure is shared by all vma's that are split off from the
8765  * original vma when split_vma()'s are done.
8866  *
89
- * The refcnt is incremented atomically because mm->mmap_sem does not
67
+ * The refcnt is incremented atomically because mm->mmap_lock does not
9068  * protect in fork case where multiple tasks share the vma_data.
9169  */
9270 struct vma_data {
....@@ -96,41 +74,8 @@
9674 	enum mspec_page_type type; /* Type of pages allocated. */
9775 	unsigned long vm_start;	/* Original (unsplit) base. */
9876 	unsigned long vm_end;	/* Original (unsplit) end. */
99
-	unsigned long maddr[0];	/* Array of MSPEC addresses. */
77
+	unsigned long maddr[];	/* Array of MSPEC addresses. */
10078 };
101
-
102
-/* used on shub2 to clear FOP cache in the HUB */
103
-static unsigned long scratch_page[MAX_NUMNODES];
104
-#define SH2_AMO_CACHE_ENTRIES	4
105
-
106
-static inline int
107
-mspec_zero_block(unsigned long addr, int len)
108
-{
109
-	int status;
110
-
111
-	if (is_sn2) {
112
-		if (is_shub2()) {
113
-			int nid;
114
-			void *p;
115
-			int i;
116
-
117
-			nid = nasid_to_cnodeid(get_node_number(__pa(addr)));
118
-			p = (void *)TO_AMO(scratch_page[nid]);
119
-
120
-			for (i=0; i < SH2_AMO_CACHE_ENTRIES; i++) {
121
-				FETCHOP_LOAD_OP(p, FETCHOP_LOAD);
122
-				p += FETCHOP_VAR_SIZE;
123
-			}
124
-		}
125
-
126
-		status = bte_copy(0, addr & ~__IA64_UNCACHED_OFFSET, len,
127
-				  BTE_WACQUIRE | BTE_ZERO_FILL, NULL);
128
-	} else {
129
-		memset((char *) addr, 0, len);
130
-		status = 0;
131
-	}
132
-	return status;
133
-}
13479 
13580 /*
13681  * mspec_open
....@@ -176,11 +121,8 @@
176121 		 */
177122 		my_page = vdata->maddr[index];
178123 		vdata->maddr[index] = 0;
179
-		if (!mspec_zero_block(my_page, PAGE_SIZE))
180
-			uncached_free_page(my_page, 1);
181
-		else
182
-			printk(KERN_WARNING "mspec_close(): "
183
-			       "failed to zero page %ld\n", my_page);
124
+		memset((char *)my_page, 0, PAGE_SIZE);
125
+		uncached_free_page(my_page, 1);
184126 	}
185127 
186128 	kvfree(vdata);
....@@ -216,11 +158,7 @@
216158 		spin_unlock(&vdata->lock);
217159 	}
218160 
219
-	if (vdata->type == MSPEC_FETCHOP)
220
-		paddr = TO_AMO(maddr);
221
-	else
222
-		paddr = maddr & ~__IA64_UNCACHED_OFFSET;
223
-
161
+	paddr = maddr & ~__IA64_UNCACHED_OFFSET;
224162 	pfn = paddr >> PAGE_SHIFT;
225163 
226164 	return vmf_insert_pfn(vmf->vma, vmf->address, pfn);
....@@ -257,10 +195,7 @@
257195 
258196 	pages = vma_pages(vma);
259197 	vdata_size = sizeof(struct vma_data) + pages * sizeof(long);
260
-	if (vdata_size <= PAGE_SIZE)
261
-		vdata = kzalloc(vdata_size, GFP_KERNEL);
262
-	else
263
-		vdata = vzalloc(vdata_size);
198
+	vdata = kvzalloc(vdata_size, GFP_KERNEL);
264199 	if (!vdata)
265200 		return -ENOMEM;
266201 
....@@ -272,17 +207,11 @@
272207 	vma->vm_private_data = vdata;
273208 
274209 	vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP;
275
-	if (vdata->type == MSPEC_FETCHOP || vdata->type == MSPEC_UNCACHED)
210
+	if (vdata->type == MSPEC_UNCACHED)
276211 		vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
277212 	vma->vm_ops = &mspec_vm_ops;
278213 
279214 	return 0;
280
-}
281
-
282
-static int
283
-fetchop_mmap(struct file *file, struct vm_area_struct *vma)
284
-{
285
-	return mspec_mmap(file, vma, MSPEC_FETCHOP);
286215 }
287216 
288217 static int
....@@ -296,18 +225,6 @@
296225 {
297226 	return mspec_mmap(file, vma, MSPEC_UNCACHED);
298227 }
299
-
300
-static const struct file_operations fetchop_fops = {
301
-	.owner = THIS_MODULE,
302
-	.mmap = fetchop_mmap,
303
-	.llseek = noop_llseek,
304
-};
305
-
306
-static struct miscdevice fetchop_miscdev = {
307
-	.minor = MISC_DYNAMIC_MINOR,
308
-	.name = "sgi_fetchop",
309
-	.fops = &fetchop_fops
310
-};
311228 
312229 static const struct file_operations cached_fops = {
313230 	.owner = THIS_MODULE,
....@@ -342,89 +259,32 @@
342259 mspec_init(void)
343260 {
344261 	int ret;
345
-	int nid;
346262 
347
-	/*
348
-	 * The fetchop device only works on SN2 hardware, uncached and cached
349
-	 * memory drivers should both be valid on all ia64 hardware
350
-	 */
351
-#ifdef CONFIG_SGI_SN
352
-	if (ia64_platform_is("sn2")) {
353
-		is_sn2 = 1;
354
-		if (is_shub2()) {
355
-			ret = -ENOMEM;
356
-			for_each_node_state(nid, N_ONLINE) {
357
-				int actual_nid;
358
-				int nasid;
359
-				unsigned long phys;
360
-
361
-				scratch_page[nid] = uncached_alloc_page(nid, 1);
362
-				if (scratch_page[nid] == 0)
363
-					goto free_scratch_pages;
364
-				phys = __pa(scratch_page[nid]);
365
-				nasid = get_node_number(phys);
366
-				actual_nid = nasid_to_cnodeid(nasid);
367
-				if (actual_nid != nid)
368
-					goto free_scratch_pages;
369
-			}
370
-		}
371
-
372
-		ret = misc_register(&fetchop_miscdev);
373
-		if (ret) {
374
-			printk(KERN_ERR
375
-			       "%s: failed to register device %i\n",
376
-			       FETCHOP_ID, ret);
377
-			goto free_scratch_pages;
378
-		}
379
-	}
380
-#endif
381263 	ret = misc_register(&cached_miscdev);
382264 	if (ret) {
383265 		printk(KERN_ERR "%s: failed to register device %i\n",
384266 		       CACHED_ID, ret);
385
-		if (is_sn2)
386
-			misc_deregister(&fetchop_miscdev);
387
-		goto free_scratch_pages;
267
+		return ret;
388268 	}
389269 	ret = misc_register(&uncached_miscdev);
390270 	if (ret) {
391271 		printk(KERN_ERR "%s: failed to register device %i\n",
392272 		       UNCACHED_ID, ret);
393273 		misc_deregister(&cached_miscdev);
394
-		if (is_sn2)
395
-			misc_deregister(&fetchop_miscdev);
396
-		goto free_scratch_pages;
274
+		return ret;
397275 	}
398276 
399
-	printk(KERN_INFO "%s %s initialized devices: %s %s %s\n",
400
-	       MSPEC_BASENAME, REVISION, is_sn2 ? FETCHOP_ID : "",
401
-	       CACHED_ID, UNCACHED_ID);
277
+	printk(KERN_INFO "%s %s initialized devices: %s %s\n",
278
+	       MSPEC_BASENAME, REVISION, CACHED_ID, UNCACHED_ID);
402279 
403280 	return 0;
404
-
405
- free_scratch_pages:
406
-	for_each_node(nid) {
407
-		if (scratch_page[nid] != 0)
408
-			uncached_free_page(scratch_page[nid], 1);
409
-	}
410
-	return ret;
411281 }
412282 
413283 static void __exit
414284 mspec_exit(void)
415285 {
416
-	int nid;
417
-
418286 	misc_deregister(&uncached_miscdev);
419287 	misc_deregister(&cached_miscdev);
420
-	if (is_sn2) {
421
-		misc_deregister(&fetchop_miscdev);
422
-
423
-		for_each_node(nid) {
424
-			if (scratch_page[nid] != 0)
425
-				uncached_free_page(scratch_page[nid], 1);
426
-		}
427
-	}
428288 }
429289 
430290 module_init(mspec_init);