[deliverable/linux.git] / drivers / char / mspec.c

/*
 * Copyright (C) 2001-2006 Silicon Graphics, Inc.  All rights
 * reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License
 * as published by the Free Software Foundation.
 */

/*
 * SN Platform Special Memory (mspec) Support
 *
 * This driver exports the SN special memory (mspec) facility to user
 * processes.
 * There are three types of memory made available thru this driver:
 * fetchops, uncached and cached.
 *
 * Fetchops are atomic memory operations that are implemented in the
 * memory controller on SGI SN hardware.
 *
 * Uncached are used for memory write combining feature of the ia64
 * cpu.
 *
 * Cached are used for areas of memory that are used as cached addresses
 * on our partition and used as uncached addresses from other partitions.
 * Due to a design constraint of the SN2 Shub, you can not have processors
 * on the same FSB perform both a cached and uncached reference to the
 * same cache line.  These special memory cached regions prevent the
 * kernel from ever dropping in a TLB entry and therefore prevent the
 * processor from ever speculating a cache line from this page.
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/miscdevice.h>
#include <linux/spinlock.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/vmalloc.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/numa.h>
#include <asm/page.h>
#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/atomic.h>
#include <asm/tlbflush.h>
#include <asm/uncached.h>
#include <asm/sn/addrs.h>
#include <asm/sn/arch.h>
#include <asm/sn/mspec.h>
#include <asm/sn/sn_cpuid.h>
#include <asm/sn/io.h>
#include <asm/sn/bte.h>
#include <asm/sn/shubio.h>


#define FETCHOP_ID	"SGI Fetchop,"
#define CACHED_ID	"Cached,"
#define UNCACHED_ID	"Uncached"
#define REVISION	"4.0"
#define MSPEC_BASENAME	"mspec"

/*
 * Page types allocated by the device.
 */
enum {
	MSPEC_FETCHOP = 1,
	MSPEC_CACHED,
	MSPEC_UNCACHED
};

#ifdef CONFIG_SGI_SN
static int is_sn2;
#else
#define is_sn2		0
#endif

/*
 * One of these structures is allocated when an mspec region is mmaped. The
 * structure is pointed to by the vma->vm_private_data field in the vma struct.
 * This structure is used to record the addresses of the mspec pages.
 */
struct vma_data {
	atomic_t refcnt;	/* Number of vmas sharing the data. */
	spinlock_t lock;	/* Serialize access to the vma. */
	int count;		/* Number of pages allocated. */
	int type;		/* Type of pages allocated. */
	unsigned long maddr[0];	/* Array of MSPEC addresses. */
};

/* used on shub2 to clear FOP cache in the HUB */
static unsigned long scratch_page[MAX_NUMNODES];
#define SH2_AMO_CACHE_ENTRIES	4

static inline int
mspec_zero_block(unsigned long addr, int len)
{
	int status;

	if (is_sn2) {
		if (is_shub2()) {
			int nid;
			void *p;
			int i;

			nid = nasid_to_cnodeid(get_node_number(__pa(addr)));
			p = (void *)TO_AMO(scratch_page[nid]);

			for (i=0; i < SH2_AMO_CACHE_ENTRIES; i++) {
				FETCHOP_LOAD_OP(p, FETCHOP_LOAD);
				p += FETCHOP_VAR_SIZE;
			}
		}

		status = bte_copy(0, addr & ~__IA64_UNCACHED_OFFSET, len,
				  BTE_WACQUIRE | BTE_ZERO_FILL, NULL);
	} else {
		memset((char *) addr, 0, len);
		status = 0;
	}
	return status;
}

/*
 * mspec_open
 *
 * Called when a device mapping is created by a means other than mmap
 * (via fork, etc.).  Increments the reference count on the underlying
 * mspec data so it is not freed prematurely.
 */
static void
mspec_open(struct vm_area_struct *vma)
{
	struct vma_data *vdata;

	vdata = vma->vm_private_data;
	atomic_inc(&vdata->refcnt);
}

/*
 * mspec_close
 *
 * Called when unmapping a device mapping. Frees all mspec pages
 * belonging to the vma.
 */
static void
mspec_close(struct vm_area_struct *vma)
{
	struct vma_data *vdata;
	int i, pages, result, vdata_size;

	vdata = vma->vm_private_data;
	if (!atomic_dec_and_test(&vdata->refcnt))
		return;

	pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
	vdata_size = sizeof(struct vma_data) + pages * sizeof(long);
	for (i = 0; i < pages; i++) {
		if (vdata->maddr[i] == 0)
			continue;
		/*
		 * Clear the page before sticking it back
		 * into the pool.
		 */
		result = mspec_zero_block(vdata->maddr[i], PAGE_SIZE);
		if (!result)
			uncached_free_page(vdata->maddr[i]);
		else
			printk(KERN_WARNING "mspec_close(): "
			       "failed to zero page %i\n",
			       result);
	}

	if (vdata_size <= PAGE_SIZE)
		kfree(vdata);
	else
		vfree(vdata);
}


/*
 * mspec_nopfn
 *
 * Creates a mspec page and maps it to user space.
 */
static unsigned long
mspec_nopfn(struct vm_area_struct *vma, unsigned long address)
{
	unsigned long paddr, maddr;
	unsigned long pfn;
	int index;
	struct vma_data *vdata = vma->vm_private_data;

	index = (address - vma->vm_start) >> PAGE_SHIFT;
	maddr = (volatile unsigned long) vdata->maddr[index];
	if (maddr == 0) {
		maddr = uncached_alloc_page(numa_node_id());
		if (maddr == 0)
			return NOPFN_OOM;

		spin_lock(&vdata->lock);
		if (vdata->maddr[index] == 0) {
			vdata->count++;
			vdata->maddr[index] = maddr;
		} else {
			uncached_free_page(maddr);
			maddr = vdata->maddr[index];
		}
		spin_unlock(&vdata->lock);
	}

	if (vdata->type == MSPEC_FETCHOP)
		paddr = TO_AMO(maddr);
	else
		paddr = maddr & ~__IA64_UNCACHED_OFFSET;

	pfn = paddr >> PAGE_SHIFT;

	return pfn;
}

static struct vm_operations_struct mspec_vm_ops = {
	.open = mspec_open,
	.close = mspec_close,
	.nopfn = mspec_nopfn
};

/*
 * mspec_mmap
 *
 * Called when mmaping the device.  Initializes the vma with a fault handler
 * and private data structure necessary to allocate, track, and free the
 * underlying pages.
 */
static int
mspec_mmap(struct file *file, struct vm_area_struct *vma, int type)
{
	struct vma_data *vdata;
	int pages, vdata_size;

	if (vma->vm_pgoff != 0)
		return -EINVAL;

	if ((vma->vm_flags & VM_SHARED) == 0)
		return -EINVAL;

	if ((vma->vm_flags & VM_WRITE) == 0)
		return -EPERM;

	pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
	vdata_size = sizeof(struct vma_data) + pages * sizeof(long);
	if (vdata_size <= PAGE_SIZE)
		vdata = kmalloc(vdata_size, GFP_KERNEL);
	else
		vdata = vmalloc(vdata_size);
	if (!vdata)
		return -ENOMEM;
	memset(vdata, 0, vdata_size);

	vdata->type = type;
	spin_lock_init(&vdata->lock);
	vdata->refcnt = ATOMIC_INIT(1);
	vma->vm_private_data = vdata;

	vma->vm_flags |= (VM_IO | VM_RESERVED | VM_PFNMAP);
	if (vdata->type == MSPEC_FETCHOP || vdata->type == MSPEC_UNCACHED)
		vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
	vma->vm_ops = &mspec_vm_ops;

	return 0;
}

static int
fetchop_mmap(struct file *file, struct vm_area_struct *vma)
{
	return mspec_mmap(file, vma, MSPEC_FETCHOP);
}

static int
cached_mmap(struct file *file, struct vm_area_struct *vma)
{
	return mspec_mmap(file, vma, MSPEC_CACHED);
}

static int
uncached_mmap(struct file *file, struct vm_area_struct *vma)
{
	return mspec_mmap(file, vma, MSPEC_UNCACHED);
}

static const struct file_operations fetchop_fops = {
	.owner = THIS_MODULE,
	.mmap = fetchop_mmap
};

static struct miscdevice fetchop_miscdev = {
	.minor = MISC_DYNAMIC_MINOR,
	.name = "sgi_fetchop",
	.fops = &fetchop_fops
};

static const struct file_operations cached_fops = {
	.owner = THIS_MODULE,
	.mmap = cached_mmap
};

static struct miscdevice cached_miscdev = {
	.minor = MISC_DYNAMIC_MINOR,
	.name = "mspec_cached",
	.fops = &cached_fops
};

static const struct file_operations uncached_fops = {
	.owner = THIS_MODULE,
	.mmap = uncached_mmap
};

static struct miscdevice uncached_miscdev = {
	.minor = MISC_DYNAMIC_MINOR,
	.name = "mspec_uncached",
	.fops = &uncached_fops
};

/*
 * mspec_init
 *
 * Called at boot time to initialize the mspec facility.
 */
static int __init
mspec_init(void)
{
	int ret;
	int nid;

	/*
	 * The fetchop device only works on SN2 hardware, uncached and cached
	 * memory drivers should both be valid on all ia64 hardware
	 */
#ifdef CONFIG_SGI_SN
	if (ia64_platform_is("sn2")) {
		is_sn2 = 1;
		if (is_shub2()) {
			ret = -ENOMEM;
			for_each_online_node(nid) {
				int actual_nid;
				int nasid;
				unsigned long phys;

				scratch_page[nid] = uncached_alloc_page(nid);
				if (scratch_page[nid] == 0)
					goto free_scratch_pages;
				phys = __pa(scratch_page[nid]);
				nasid = get_node_number(phys);
				actual_nid = nasid_to_cnodeid(nasid);
				if (actual_nid != nid)
					goto free_scratch_pages;
			}
		}

		ret = misc_register(&fetchop_miscdev);
		if (ret) {
			printk(KERN_ERR
			       "%s: failed to register device %i\n",
			       FETCHOP_ID, ret);
			goto free_scratch_pages;
		}
	}
#endif
	ret = misc_register(&cached_miscdev);
	if (ret) {
		printk(KERN_ERR "%s: failed to register device %i\n",
		       CACHED_ID, ret);
		if (is_sn2)
			misc_deregister(&fetchop_miscdev);
		goto free_scratch_pages;
	}
	ret = misc_register(&uncached_miscdev);
	if (ret) {
		printk(KERN_ERR "%s: failed to register device %i\n",
		       UNCACHED_ID, ret);
		misc_deregister(&cached_miscdev);
		if (is_sn2)
			misc_deregister(&fetchop_miscdev);
		goto free_scratch_pages;
	}

	printk(KERN_INFO "%s %s initialized devices: %s %s %s\n",
	       MSPEC_BASENAME, REVISION, is_sn2 ? FETCHOP_ID : "",
	       CACHED_ID, UNCACHED_ID);

	return 0;

 free_scratch_pages:
	for_each_node(nid) {
		if (scratch_page[nid] != 0)
			uncached_free_page(scratch_page[nid]);
	}
	return ret;
}

static void __exit
mspec_exit(void)
{
	int nid;

	misc_deregister(&uncached_miscdev);
	misc_deregister(&cached_miscdev);
	if (is_sn2) {
		misc_deregister(&fetchop_miscdev);

		for_each_node(nid) {
			if (scratch_page[nid] != 0)
				uncached_free_page(scratch_page[nid]);
		}
	}
}

module_init(mspec_init);
module_exit(mspec_exit);

MODULE_AUTHOR("Silicon Graphics, Inc. <linux-altix@sgi.com>");
MODULE_DESCRIPTION("Driver for SGI SN special memory operations");
MODULE_LICENSE("GPL");
Commit	Line	Data
17a3b050 JS	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
17a3b050 JS	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>
4e950f6f	41	#include <linux/fs.h>
17a3b050 JS	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 <asm/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	*/
	70	enum {
	71	MSPEC_FETCHOP = 1,
	72	MSPEC_CACHED,
	73	MSPEC_UNCACHED
	74	};
	75
1a4b0fc5	76	#ifdef CONFIG_SGI_SN
17a3b050	77	static int is_sn2;
1a4b0fc5 JS	78	#else
	79	#define is_sn2 0
	80	#endif
17a3b050 JS	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	*/
	87	struct vma_data {
	88	atomic_t refcnt; /* Number of vmas sharing the data. */
	89	spinlock_t lock; /* Serialize access to the vma. */
	90	int count; /* Number of pages allocated. */
	91	int type; /* Type of pages allocated. */
	92	unsigned long maddr[0]; /* Array of MSPEC addresses. */
	93	};
	94
	95	/* used on shub2 to clear FOP cache in the HUB */
	96	static unsigned long scratch_page[MAX_NUMNODES];
	97	#define SH2_AMO_CACHE_ENTRIES 4
	98
	99	static inline int
	100	mspec_zero_block(unsigned long addr, int len)
	101	{
	102	int status;
	103
	104	if (is_sn2) {
	105	if (is_shub2()) {
	106	int nid;
	107	void *p;
	108	int i;
	109
	110	nid = nasid_to_cnodeid(get_node_number(__pa(addr)));
	111	p = (void *)TO_AMO(scratch_page[nid]);
	112
	113	for (i=0; i < SH2_AMO_CACHE_ENTRIES; i++) {
	114	FETCHOP_LOAD_OP(p, FETCHOP_LOAD);
	115	p += FETCHOP_VAR_SIZE;
	116	}
	117	}
	118
	119	status = bte_copy(0, addr & ~__IA64_UNCACHED_OFFSET, len,
	120	BTE_WACQUIRE \| BTE_ZERO_FILL, NULL);
	121	} else {
	122	memset((char *) addr, 0, len);
	123	status = 0;
	124	}
	125	return status;
	126	}
	127
	128	/*
	129	* mspec_open
	130	*
	131	* Called when a device mapping is created by a means other than mmap
	132	* (via fork, etc.). Increments the reference count on the underlying
	133	* mspec data so it is not freed prematurely.
	134	*/
	135	static void
	136	mspec_open(struct vm_area_struct *vma)
	137	{
	138	struct vma_data *vdata;
	139
	140	vdata = vma->vm_private_data;
	141	atomic_inc(&vdata->refcnt);
	142	}
	143
	144	/*
145	* mspec_close
146	*
147	* Called when unmapping a device mapping. Frees all mspec pages
148	* belonging to the vma.
149	*/
150	static void
151	mspec_close(struct vm_area_struct *vma)
152	{
153	struct vma_data *vdata;
154	int i, pages, result, vdata_size;
155
156	vdata = vma->vm_private_data;
157	if (!atomic_dec_and_test(&vdata->refcnt))
158	return;
159
160	pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
161	vdata_size = sizeof(struct vma_data) + pages * sizeof(long);
162	for (i = 0; i < pages; i++) {
163	if (vdata->maddr[i] == 0)
164	continue;
165	/*
166	* Clear the page before sticking it back
167	* into the pool.
168	*/
169	result = mspec_zero_block(vdata->maddr[i], PAGE_SIZE);
170	if (!result)
171	uncached_free_page(vdata->maddr[i]);
172	else
173	printk(KERN_WARNING "mspec_close(): "
174	"failed to zero page %i\n",
175	result);
176	}
177
178	if (vdata_size <= PAGE_SIZE)
179	kfree(vdata);
180	else
181	vfree(vdata);
182	}
183
184
185	/*
186	* mspec_nopfn
187	*
188	* Creates a mspec page and maps it to user space.
189	*/
190	static unsigned long
191	mspec_nopfn(struct vm_area_struct *vma, unsigned long address)
192	{
193	unsigned long paddr, maddr;
194	unsigned long pfn;
195	int index;
196	struct vma_data *vdata = vma->vm_private_data;
197
198	index = (address - vma->vm_start) >> PAGE_SHIFT;
199	maddr = (volatile unsigned long) vdata->maddr[index];
200	if (maddr == 0) {
201	maddr = uncached_alloc_page(numa_node_id());
202	if (maddr == 0)
203	return NOPFN_OOM;
204
205	spin_lock(&vdata->lock);
206	if (vdata->maddr[index] == 0) {
207	vdata->count++;
208	vdata->maddr[index] = maddr;
209	} else {
210	uncached_free_page(maddr);
211	maddr = vdata->maddr[index];
212	}
213	spin_unlock(&vdata->lock);
214	}
215
216	if (vdata->type == MSPEC_FETCHOP)
217	paddr = TO_AMO(maddr);
218	else
1a4b0fc5	219	paddr = maddr & ~__IA64_UNCACHED_OFFSET;
17a3b050 JS	220
	221	pfn = paddr >> PAGE_SHIFT;
	222
	223	return pfn;
	224	}
	225
	226	static struct vm_operations_struct mspec_vm_ops = {
	227	.open = mspec_open,
	228	.close = mspec_close,
	229	.nopfn = mspec_nopfn
	230	};
	231
	232	/*
	233	* mspec_mmap
	234	*
	235	* Called when mmaping the device. Initializes the vma with a fault handler
	236	* and private data structure necessary to allocate, track, and free the
	237	* underlying pages.
	238	*/
	239	static int
	240	mspec_mmap(struct file file, struct vm_area_struct vma, int type)
	241	{
	242	struct vma_data *vdata;
	243	int pages, vdata_size;
	244
	245	if (vma->vm_pgoff != 0)
	246	return -EINVAL;
	247
	248	if ((vma->vm_flags & VM_SHARED) == 0)
	249	return -EINVAL;
	250
	251	if ((vma->vm_flags & VM_WRITE) == 0)
	252	return -EPERM;
	253
	254	pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
	255	vdata_size = sizeof(struct vma_data) + pages * sizeof(long);
	256	if (vdata_size <= PAGE_SIZE)
	257	vdata = kmalloc(vdata_size, GFP_KERNEL);
	258	else
	259	vdata = vmalloc(vdata_size);
	260	if (!vdata)
	261	return -ENOMEM;
	262	memset(vdata, 0, vdata_size);
	263
	264	vdata->type = type;
	265	spin_lock_init(&vdata->lock);
	266	vdata->refcnt = ATOMIC_INIT(1);
	267	vma->vm_private_data = vdata;
	268
5dc4ac63	269	vma->vm_flags \|= (VM_IO \| VM_RESERVED \| VM_PFNMAP);
17a3b050 JS	270	if (vdata->type == MSPEC_FETCHOP \|\| vdata->type == MSPEC_UNCACHED)
	271	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
	272	vma->vm_ops = &mspec_vm_ops;
	273
	274	return 0;
	275	}
	276
	277	static int
	278	fetchop_mmap(struct file file, struct vm_area_struct vma)
	279	{
	280	return mspec_mmap(file, vma, MSPEC_FETCHOP);
	281	}
	282
	283	static int
	284	cached_mmap(struct file file, struct vm_area_struct vma)
	285	{
	286	return mspec_mmap(file, vma, MSPEC_CACHED);
	287	}
	288
	289	static int
	290	uncached_mmap(struct file file, struct vm_area_struct vma)
	291	{
	292	return mspec_mmap(file, vma, MSPEC_UNCACHED);
	293	}
	294
2b8693c0	295	static const struct file_operations fetchop_fops = {
17a3b050 JS	296	.owner = THIS_MODULE,
	297	.mmap = fetchop_mmap
	298	};
	299
	300	static struct miscdevice fetchop_miscdev = {
	301	.minor = MISC_DYNAMIC_MINOR,
	302	.name = "sgi_fetchop",
	303	.fops = &fetchop_fops
	304	};
	305
2b8693c0	306	static const struct file_operations cached_fops = {
17a3b050 JS	307	.owner = THIS_MODULE,
	308	.mmap = cached_mmap
	309	};
	310
	311	static struct miscdevice cached_miscdev = {
	312	.minor = MISC_DYNAMIC_MINOR,
	313	.name = "mspec_cached",
	314	.fops = &cached_fops
	315	};
	316
2b8693c0	317	static const struct file_operations uncached_fops = {
17a3b050 JS	318	.owner = THIS_MODULE,
	319	.mmap = uncached_mmap
	320	};
	321
	322	static struct miscdevice uncached_miscdev = {
	323	.minor = MISC_DYNAMIC_MINOR,
	324	.name = "mspec_uncached",
	325	.fops = &uncached_fops
	326	};
	327
	328	/*
	329	* mspec_init
	330	*
	331	* Called at boot time to initialize the mspec facility.
	332	*/
	333	static int __init
	334	mspec_init(void)
	335	{
	336	int ret;
	337	int nid;
	338
	339	/*
	340	* The fetchop device only works on SN2 hardware, uncached and cached
	341	* memory drivers should both be valid on all ia64 hardware
	342	*/
1a4b0fc5	343	#ifdef CONFIG_SGI_SN
17a3b050 JS	344	if (ia64_platform_is("sn2")) {
	345	is_sn2 = 1;
	346	if (is_shub2()) {
	347	ret = -ENOMEM;
	348	for_each_online_node(nid) {
	349	int actual_nid;
	350	int nasid;
	351	unsigned long phys;
	352
	353	scratch_page[nid] = uncached_alloc_page(nid);
	354	if (scratch_page[nid] == 0)
	355	goto free_scratch_pages;
	356	phys = __pa(scratch_page[nid]);
	357	nasid = get_node_number(phys);
	358	actual_nid = nasid_to_cnodeid(nasid);
	359	if (actual_nid != nid)
	360	goto free_scratch_pages;
	361	}
	362	}
	363
	364	ret = misc_register(&fetchop_miscdev);
	365	if (ret) {
	366	printk(KERN_ERR
	367	"%s: failed to register device %i\n",
	368	FETCHOP_ID, ret);
	369	goto free_scratch_pages;
	370	}
	371	}
1a4b0fc5	372	#endif
17a3b050 JS	373	ret = misc_register(&cached_miscdev);
	374	if (ret) {
	375	printk(KERN_ERR "%s: failed to register device %i\n",
	376	CACHED_ID, ret);
	377	if (is_sn2)
	378	misc_deregister(&fetchop_miscdev);
	379	goto free_scratch_pages;
	380	}
	381	ret = misc_register(&uncached_miscdev);
	382	if (ret) {
	383	printk(KERN_ERR "%s: failed to register device %i\n",
	384	UNCACHED_ID, ret);
	385	misc_deregister(&cached_miscdev);
	386	if (is_sn2)
	387	misc_deregister(&fetchop_miscdev);
	388	goto free_scratch_pages;
	389	}
	390
	391	printk(KERN_INFO "%s %s initialized devices: %s %s %s\n",
	392	MSPEC_BASENAME, REVISION, is_sn2 ? FETCHOP_ID : "",
	393	CACHED_ID, UNCACHED_ID);
	394
	395	return 0;
	396
	397	free_scratch_pages:
	398	for_each_node(nid) {
	399	if (scratch_page[nid] != 0)
	400	uncached_free_page(scratch_page[nid]);
	401	}
	402	return ret;
	403	}
	404
	405	static void __exit
	406	mspec_exit(void)
	407	{
	408	int nid;
	409
	410	misc_deregister(&uncached_miscdev);
	411	misc_deregister(&cached_miscdev);
	412	if (is_sn2) {
	413	misc_deregister(&fetchop_miscdev);
	414
	415	for_each_node(nid) {
	416	if (scratch_page[nid] != 0)
	417	uncached_free_page(scratch_page[nid]);
	418	}
	419	}
	420	}
	421
	422	module_init(mspec_init);
	423	module_exit(mspec_exit);
	424
	425	MODULE_AUTHOR("Silicon Graphics, Inc. <linux-altix@sgi.com>");
	426	MODULE_DESCRIPTION("Driver for SGI SN special memory operations");
	427	MODULE_LICENSE("GPL");