[mirror_ubuntu-bionic-kernel.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_page_type {
	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.
 * This structure is shared by all vma's that are split off from the
 * original vma when split_vma()'s are done.
 *
 * The refcnt is incremented atomically because mm->mmap_sem does not
 * protect in fork case where multiple tasks share the vma_data.
 */
struct vma_data {
	atomic_t refcnt;	/* Number of vmas sharing the data. */
	spinlock_t lock;	/* Serialize access to this structure. */
	int count;		/* Number of pages allocated. */
	enum mspec_page_type type; /* Type of pages allocated. */
	int flags;		/* See VMD_xxx below. */
	unsigned long vm_start;	/* Original (unsplit) base. */
	unsigned long vm_end;	/* Original (unsplit) end. */
	unsigned long maddr[0];	/* Array of MSPEC addresses. */
};

#define VMD_VMALLOCED 0x1	/* vmalloc'd rather than kmalloc'd */

/* 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, munmap, 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 index, last_index, result;
	unsigned long my_page;

	vdata = vma->vm_private_data;

	BUG_ON(vma->vm_start < vdata->vm_start || vma->vm_end > vdata->vm_end);

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

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

	if (vdata->flags & VMD_VMALLOCED)
		vfree(vdata);
	else
		kfree(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;

	BUG_ON(address < vdata->vm_start || address >= vdata->vm_end);
	index = (address - vdata->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,
					enum mspec_page_type type)
{
	struct vma_data *vdata;
	int pages, vdata_size, flags = 0;

	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);
		flags = VMD_VMALLOCED;
	}
	if (!vdata)
		return -ENOMEM;
	memset(vdata, 0, vdata_size);

	vdata->vm_start = vma->vm_start;
	vdata->vm_end = vma->vm_end;
	vdata->flags = flags;
	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	*/
4191ba26	70	enum mspec_page_type {
17a3b050 JS	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.
4191ba26 CW	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.
17a3b050 JS	91	*/
	92	struct vma_data {
	93	atomic_t refcnt; /* Number of vmas sharing the data. */
4191ba26	94	spinlock_t lock; /* Serialize access to this structure. */
17a3b050	95	int count; /* Number of pages allocated. */
4191ba26 CW	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. */
17a3b050 JS	100	unsigned long maddr[0]; /* Array of MSPEC addresses. */
	101	};
	102
4191ba26 CW	103	#define VMD_VMALLOCED 0x1 /* vmalloc'd rather than kmalloc'd */
4191ba26 CW	104
17a3b050 JS	105	/* used on shub2 to clear FOP cache in the HUB */
	106	static unsigned long scratch_page[MAX_NUMNODES];
	107	#define SH2_AMO_CACHE_ENTRIES 4
	108
	109	static inline int
	110	mspec_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
4191ba26 CW	142	* (via fork, munmap, etc.). Increments the reference count on the
4191ba26 CW	143	* underlying mspec data so it is not freed prematurely.
17a3b050 JS	144	*/
	145	static void
	146	mspec_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 the vma.
	159	*/
	160	static void
	161	mspec_close(struct vm_area_struct *vma)
	162	{
	163	struct vma_data *vdata;
4191ba26 CW	164	int index, last_index, result;
4191ba26 CW	165	unsigned long my_page;
17a3b050 JS	166
17a3b050 JS	167	vdata = vma->vm_private_data;
17a3b050	168
4191ba26 CW	169	BUG_ON(vma->vm_start < vdata->vm_start \|\| vma->vm_end > vdata->vm_end);
	170
	171	spin_lock(&vdata->lock);
	172	index = (vma->vm_start - vdata->vm_start) >> PAGE_SHIFT;
	173	last_index = (vma->vm_end - vdata->vm_start) >> PAGE_SHIFT;
	174	for (; index < last_index; index++) {
	175	if (vdata->maddr[index] == 0)
17a3b050 JS	176	continue;
	177	/*
	178	* Clear the page before sticking it back
	179	* into the pool.
	180	*/
4191ba26 CW	181	my_page = vdata->maddr[index];
	182	vdata->maddr[index] = 0;
	183	spin_unlock(&vdata->lock);
	184	result = mspec_zero_block(my_page, PAGE_SIZE);
17a3b050	185	if (!result)
4191ba26	186	uncached_free_page(my_page);
17a3b050 JS	187	else
	188	printk(KERN_WARNING "mspec_close(): "
	189	"failed to zero page %i\n",
	190	result);
4191ba26	191	spin_lock(&vdata->lock);
17a3b050	192	}
4191ba26	193	spin_unlock(&vdata->lock);
17a3b050	194
4191ba26 CW	195	if (!atomic_dec_and_test(&vdata->refcnt))
	196	return;
	197
	198	if (vdata->flags & VMD_VMALLOCED)
17a3b050	199	vfree(vdata);
4191ba26 CW	200	else
4191ba26 CW	201	kfree(vdata);
17a3b050 JS	202	}
	203
	204
	205	/*
	206	* mspec_nopfn
	207	*
	208	* Creates a mspec page and maps it to user space.
	209	*/
	210	static unsigned long
	211	mspec_nopfn(struct vm_area_struct *vma, unsigned long address)
	212	{
	213	unsigned long paddr, maddr;
	214	unsigned long pfn;
	215	int index;
	216	struct vma_data *vdata = vma->vm_private_data;
	217
4191ba26 CW	218	BUG_ON(address < vdata->vm_start \|\| address >= vdata->vm_end);
4191ba26 CW	219	index = (address - vdata->vm_start) >> PAGE_SHIFT;
17a3b050 JS	220	maddr = (volatile unsigned long) vdata->maddr[index];
	221	if (maddr == 0) {
	222	maddr = uncached_alloc_page(numa_node_id());
	223	if (maddr == 0)
	224	return NOPFN_OOM;
	225
	226	spin_lock(&vdata->lock);
	227	if (vdata->maddr[index] == 0) {
	228	vdata->count++;
	229	vdata->maddr[index] = maddr;
	230	} else {
	231	uncached_free_page(maddr);
	232	maddr = vdata->maddr[index];
	233	}
	234	spin_unlock(&vdata->lock);
	235	}
	236
	237	if (vdata->type == MSPEC_FETCHOP)
	238	paddr = TO_AMO(maddr);
	239	else
1a4b0fc5	240	paddr = maddr & ~__IA64_UNCACHED_OFFSET;
17a3b050 JS	241
	242	pfn = paddr >> PAGE_SHIFT;
	243
	244	return pfn;
	245	}
	246
	247	static struct vm_operations_struct mspec_vm_ops = {
	248	.open = mspec_open,
	249	.close = mspec_close,
	250	.nopfn = mspec_nopfn
	251	};
	252
	253	/*
	254	* mspec_mmap
	255	*
	256	* Called when mmaping the device. Initializes the vma with a fault handler
	257	* and private data structure necessary to allocate, track, and free the
	258	* underlying pages.
	259	*/
	260	static int
4191ba26 CW	261	mspec_mmap(struct file file, struct vm_area_struct vma,
4191ba26 CW	262	enum mspec_page_type type)
17a3b050 JS	263	{
17a3b050 JS	264	struct vma_data *vdata;
4191ba26	265	int pages, vdata_size, flags = 0;
17a3b050 JS	266
	267	if (vma->vm_pgoff != 0)
	268	return -EINVAL;
	269
	270	if ((vma->vm_flags & VM_SHARED) == 0)
	271	return -EINVAL;
	272
	273	if ((vma->vm_flags & VM_WRITE) == 0)
	274	return -EPERM;
	275
	276	pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
	277	vdata_size = sizeof(struct vma_data) + pages * sizeof(long);
	278	if (vdata_size <= PAGE_SIZE)
	279	vdata = kmalloc(vdata_size, GFP_KERNEL);
4191ba26	280	else {
17a3b050	281	vdata = vmalloc(vdata_size);
4191ba26 CW	282	flags = VMD_VMALLOCED;
4191ba26 CW	283	}
17a3b050 JS	284	if (!vdata)
	285	return -ENOMEM;
	286	memset(vdata, 0, vdata_size);
	287
4191ba26 CW	288	vdata->vm_start = vma->vm_start;
	289	vdata->vm_end = vma->vm_end;
	290	vdata->flags = flags;
17a3b050 JS	291	vdata->type = type;
	292	spin_lock_init(&vdata->lock);
	293	vdata->refcnt = ATOMIC_INIT(1);
	294	vma->vm_private_data = vdata;
	295
5dc4ac63	296	vma->vm_flags \|= (VM_IO \| VM_RESERVED \| VM_PFNMAP);
17a3b050 JS	297	if (vdata->type == MSPEC_FETCHOP \|\| vdata->type == MSPEC_UNCACHED)
	298	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
	299	vma->vm_ops = &mspec_vm_ops;
	300
	301	return 0;
	302	}
	303
	304	static int
	305	fetchop_mmap(struct file file, struct vm_area_struct vma)
	306	{
	307	return mspec_mmap(file, vma, MSPEC_FETCHOP);
	308	}
	309
	310	static int
	311	cached_mmap(struct file file, struct vm_area_struct vma)
	312	{
	313	return mspec_mmap(file, vma, MSPEC_CACHED);
	314	}
	315
	316	static int
	317	uncached_mmap(struct file file, struct vm_area_struct vma)
	318	{
	319	return mspec_mmap(file, vma, MSPEC_UNCACHED);
	320	}
	321
2b8693c0	322	static const struct file_operations fetchop_fops = {
17a3b050 JS	323	.owner = THIS_MODULE,
	324	.mmap = fetchop_mmap
	325	};
	326
	327	static struct miscdevice fetchop_miscdev = {
	328	.minor = MISC_DYNAMIC_MINOR,
	329	.name = "sgi_fetchop",
	330	.fops = &fetchop_fops
	331	};
	332
2b8693c0	333	static const struct file_operations cached_fops = {
17a3b050 JS	334	.owner = THIS_MODULE,
	335	.mmap = cached_mmap
	336	};
	337
	338	static struct miscdevice cached_miscdev = {
	339	.minor = MISC_DYNAMIC_MINOR,
	340	.name = "mspec_cached",
	341	.fops = &cached_fops
	342	};
	343
2b8693c0	344	static const struct file_operations uncached_fops = {
17a3b050 JS	345	.owner = THIS_MODULE,
	346	.mmap = uncached_mmap
	347	};
	348
	349	static struct miscdevice uncached_miscdev = {
	350	.minor = MISC_DYNAMIC_MINOR,
	351	.name = "mspec_uncached",
	352	.fops = &uncached_fops
	353	};
	354
	355	/*
	356	* mspec_init
	357	*
	358	* Called at boot time to initialize the mspec facility.
	359	*/
	360	static int __init
	361	mspec_init(void)
	362	{
	363	int ret;
	364	int nid;
	365
	366	/*
	367	* The fetchop device only works on SN2 hardware, uncached and cached
	368	* memory drivers should both be valid on all ia64 hardware
	369	*/
1a4b0fc5	370	#ifdef CONFIG_SGI_SN
17a3b050 JS	371	if (ia64_platform_is("sn2")) {
	372	is_sn2 = 1;
	373	if (is_shub2()) {
	374	ret = -ENOMEM;
	375	for_each_online_node(nid) {
	376	int actual_nid;
	377	int nasid;
	378	unsigned long phys;
	379
	380	scratch_page[nid] = uncached_alloc_page(nid);
	381	if (scratch_page[nid] == 0)
	382	goto free_scratch_pages;
	383	phys = __pa(scratch_page[nid]);
	384	nasid = get_node_number(phys);
	385	actual_nid = nasid_to_cnodeid(nasid);
	386	if (actual_nid != nid)
	387	goto free_scratch_pages;
	388	}
	389	}
	390
	391	ret = misc_register(&fetchop_miscdev);
	392	if (ret) {
	393	printk(KERN_ERR
	394	"%s: failed to register device %i\n",
	395	FETCHOP_ID, ret);
	396	goto free_scratch_pages;
	397	}
	398	}
1a4b0fc5	399	#endif
17a3b050 JS	400	ret = misc_register(&cached_miscdev);
	401	if (ret) {
	402	printk(KERN_ERR "%s: failed to register device %i\n",
	403	CACHED_ID, ret);
	404	if (is_sn2)
	405	misc_deregister(&fetchop_miscdev);
	406	goto free_scratch_pages;
	407	}
	408	ret = misc_register(&uncached_miscdev);
	409	if (ret) {
	410	printk(KERN_ERR "%s: failed to register device %i\n",
	411	UNCACHED_ID, ret);
	412	misc_deregister(&cached_miscdev);
	413	if (is_sn2)
	414	misc_deregister(&fetchop_miscdev);
	415	goto free_scratch_pages;
	416	}
	417
	418	printk(KERN_INFO "%s %s initialized devices: %s %s %s\n",
	419	MSPEC_BASENAME, REVISION, is_sn2 ? FETCHOP_ID : "",
	420	CACHED_ID, UNCACHED_ID);
	421
	422	return 0;
	423
	424	free_scratch_pages:
	425	for_each_node(nid) {
	426	if (scratch_page[nid] != 0)
	427	uncached_free_page(scratch_page[nid]);
	428	}
	429	return ret;
	430	}
	431
	432	static void __exit
	433	mspec_exit(void)
	434	{
	435	int nid;
	436
	437	misc_deregister(&uncached_miscdev);
	438	misc_deregister(&cached_miscdev);
	439	if (is_sn2) {
	440	misc_deregister(&fetchop_miscdev);
	441
	442	for_each_node(nid) {
	443	if (scratch_page[nid] != 0)
	444	uncached_free_page(scratch_page[nid]);
	445	}
	446	}
	447	}
	448
	449	module_init(mspec_init);
	450	module_exit(mspec_exit);
	451
	452	MODULE_AUTHOR("Silicon Graphics, Inc. <linux-altix@sgi.com>");
	453	MODULE_DESCRIPTION("Driver for SGI SN special memory operations");
	454	MODULE_LICENSE("GPL");