[apple/xnu.git] / osfmk / i386 / pmap_common.c

/*
 * Copyright (c) 2000-2010 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
#include <vm/pmap.h>
#include <kern/ledger.h>
#include <i386/pmap_internal.h>


/*
 *	Each entry in the pv_head_table is locked by a bit in the
 *	pv_lock_table.  The lock bits are accessed by the physical
 *	address of the page they lock.
 */

char	*pv_lock_table;		/* pointer to array of bits */
char    *pv_hash_lock_table;

pv_rooted_entry_t	pv_head_table;		/* array of entries, one per
						 * page */
uint32_t			pv_hashed_free_count = 0;
uint32_t			pv_hashed_kern_free_count = 0;

pmap_pagetable_corruption_record_t pmap_pagetable_corruption_records[PMAP_PAGETABLE_CORRUPTION_MAX_LOG];
uint32_t pmap_pagetable_corruption_incidents;
uint64_t pmap_pagetable_corruption_last_abstime = (~(0ULL) >> 1);
uint64_t pmap_pagetable_corruption_interval_abstime;
thread_call_t 	pmap_pagetable_corruption_log_call;
static thread_call_data_t 	pmap_pagetable_corruption_log_call_data;
boolean_t pmap_pagetable_corruption_timeout = FALSE;

volatile uint32_t	mappingrecurse = 0;

uint32_t  pv_hashed_low_water_mark, pv_hashed_kern_low_water_mark, pv_hashed_alloc_chunk, pv_hashed_kern_alloc_chunk;

thread_t mapping_replenish_thread;
event_t	mapping_replenish_event, pmap_user_pv_throttle_event;

uint64_t pmap_pv_throttle_stat, pmap_pv_throttled_waiters;

unsigned int pmap_cache_attributes(ppnum_t pn) {
	if (pmap_get_cache_attributes(pn) & INTEL_PTE_NCACHE)
	        return (VM_WIMG_IO);
	else
		return (VM_WIMG_COPYBACK);
}

void	pmap_set_cache_attributes(ppnum_t pn, unsigned int cacheattr) {
	unsigned int current, template = 0;
	int pai;

	if (cacheattr & VM_MEM_NOT_CACHEABLE) {
		if(!(cacheattr & VM_MEM_GUARDED))
			template |= PHYS_PTA;
		template |= PHYS_NCACHE;
	}

	pmap_intr_assert();

	assert((pn != vm_page_fictitious_addr) && (pn != vm_page_guard_addr));

	pai = ppn_to_pai(pn);

	if (!IS_MANAGED_PAGE(pai)) {
		return;
	}

	/* override cache attributes for this phys page
	 * Does not walk through existing mappings to adjust,
	 * assumes page is disconnected
	 */

	LOCK_PVH(pai);

	pmap_update_cache_attributes_locked(pn, template);

	current = pmap_phys_attributes[pai] & PHYS_CACHEABILITY_MASK;
	pmap_phys_attributes[pai] &= ~PHYS_CACHEABILITY_MASK;
	pmap_phys_attributes[pai] |= template;

	UNLOCK_PVH(pai);

	if ((template & PHYS_NCACHE) && !(current & PHYS_NCACHE)) {
		pmap_sync_page_attributes_phys(pn);
	}
}

unsigned	pmap_get_cache_attributes(ppnum_t pn) {
	if (last_managed_page == 0)
		return 0;

	if (!IS_MANAGED_PAGE(ppn_to_pai(pn))) {
	    return INTEL_PTE_NCACHE;
	}

	/*
	 * The cache attributes are read locklessly for efficiency.
	 */
	unsigned int attr = pmap_phys_attributes[ppn_to_pai(pn)];
	unsigned int template = 0;
	
	if (attr & PHYS_PTA)
		template |= INTEL_PTE_PTA;
	if (attr & PHYS_NCACHE)
		template |= INTEL_PTE_NCACHE;
	return template;
}


boolean_t
pmap_is_noencrypt(ppnum_t pn)
{
	int		pai;

	pai = ppn_to_pai(pn);

	if (!IS_MANAGED_PAGE(pai))
		return (FALSE);

	if (pmap_phys_attributes[pai] & PHYS_NOENCRYPT)
		return (TRUE);

	return (FALSE);
}


void
pmap_set_noencrypt(ppnum_t pn)
{
	int		pai;

	pai = ppn_to_pai(pn);

	if (IS_MANAGED_PAGE(pai)) {
		LOCK_PVH(pai);

		pmap_phys_attributes[pai] |= PHYS_NOENCRYPT;

		UNLOCK_PVH(pai);
	}
}


void
pmap_clear_noencrypt(ppnum_t pn)
{
	int		pai;

	pai = ppn_to_pai(pn);

	if (IS_MANAGED_PAGE(pai)) {
		/*
		 * synchronization at VM layer prevents PHYS_NOENCRYPT
		 * from changing state, so we don't need the lock to inspect
		 */
		if (pmap_phys_attributes[pai] & PHYS_NOENCRYPT) {
			LOCK_PVH(pai);

			pmap_phys_attributes[pai] &= ~PHYS_NOENCRYPT;

			UNLOCK_PVH(pai);
		}
	}
}

void
compute_pmap_gc_throttle(void *arg __unused)
{
	
}


__private_extern__ void
pmap_pagetable_corruption_msg_log(int (*log_func)(const char * fmt, ...)__printflike(1,2)) {
	if (pmap_pagetable_corruption_incidents > 0) {
		int i, e = MIN(pmap_pagetable_corruption_incidents, PMAP_PAGETABLE_CORRUPTION_MAX_LOG);
		(*log_func)("%u pagetable corruption incident(s) detected, timeout: %u\n", pmap_pagetable_corruption_incidents, pmap_pagetable_corruption_timeout);
		for (i = 0; i < e; i++) {
			(*log_func)("Incident 0x%x, reason: 0x%x, action: 0x%x, time: 0x%llx\n", pmap_pagetable_corruption_records[i].incident,  pmap_pagetable_corruption_records[i].reason, pmap_pagetable_corruption_records[i].action, pmap_pagetable_corruption_records[i].abstime);
		}
	}
}

static inline void
pmap_pagetable_corruption_log_setup(void) {
	if (pmap_pagetable_corruption_log_call == NULL) {
		nanotime_to_absolutetime(PMAP_PAGETABLE_CORRUPTION_INTERVAL, 0, &pmap_pagetable_corruption_interval_abstime);
		thread_call_setup(&pmap_pagetable_corruption_log_call_data,
		    (thread_call_func_t) pmap_pagetable_corruption_msg_log,
		    (thread_call_param_t) &printf);
		pmap_pagetable_corruption_log_call = &pmap_pagetable_corruption_log_call_data;
	}
}

void
mapping_free_prime(void)
{
	unsigned		i;
	pv_hashed_entry_t	pvh_e;
	pv_hashed_entry_t	pvh_eh;
	pv_hashed_entry_t	pvh_et;
	int			pv_cnt;

	/* Scale based on DRAM size */
	pv_hashed_low_water_mark = MAX(PV_HASHED_LOW_WATER_MARK_DEFAULT, ((uint32_t)(sane_size >> 30)) * 2000);
	pv_hashed_low_water_mark = MIN(pv_hashed_low_water_mark, 16000);
	/* Alterable via sysctl */
	pv_hashed_kern_low_water_mark = MAX(PV_HASHED_KERN_LOW_WATER_MARK_DEFAULT, ((uint32_t)(sane_size >> 30)) * 1000);
	pv_hashed_kern_low_water_mark = MIN(pv_hashed_kern_low_water_mark, 16000);
	pv_hashed_kern_alloc_chunk = PV_HASHED_KERN_ALLOC_CHUNK_INITIAL;
	pv_hashed_alloc_chunk = PV_HASHED_ALLOC_CHUNK_INITIAL;

	pv_cnt = 0;
	pvh_eh = pvh_et = PV_HASHED_ENTRY_NULL;

	for (i = 0; i < (5 * PV_HASHED_ALLOC_CHUNK_INITIAL); i++) {
		pvh_e = (pv_hashed_entry_t) zalloc(pv_hashed_list_zone);

		pvh_e->qlink.next = (queue_entry_t)pvh_eh;
		pvh_eh = pvh_e;

		if (pvh_et == PV_HASHED_ENTRY_NULL)
		        pvh_et = pvh_e;
		pv_cnt++;
	}
	PV_HASHED_FREE_LIST(pvh_eh, pvh_et, pv_cnt);

	pv_cnt = 0;
	pvh_eh = pvh_et = PV_HASHED_ENTRY_NULL;
	for (i = 0; i < PV_HASHED_KERN_ALLOC_CHUNK_INITIAL; i++) {
		pvh_e = (pv_hashed_entry_t) zalloc(pv_hashed_list_zone);

		pvh_e->qlink.next = (queue_entry_t)pvh_eh;
		pvh_eh = pvh_e;

		if (pvh_et == PV_HASHED_ENTRY_NULL)
		        pvh_et = pvh_e;
		pv_cnt++;
	}
	PV_HASHED_KERN_FREE_LIST(pvh_eh, pvh_et, pv_cnt);
}

void mapping_replenish(void);

void mapping_adjust(void) {
	kern_return_t mres;

	pmap_pagetable_corruption_log_setup();

	mres = kernel_thread_start_priority((thread_continue_t)mapping_replenish, NULL, MAXPRI_KERNEL, &mapping_replenish_thread);
	if (mres != KERN_SUCCESS) {
		panic("pmap: mapping_replenish_thread creation failed");
	}
	thread_deallocate(mapping_replenish_thread);
}

unsigned pmap_mapping_thread_wakeups;	
unsigned pmap_kernel_reserve_replenish_stat;
unsigned pmap_user_reserve_replenish_stat;
unsigned pmap_kern_reserve_alloc_stat;

void mapping_replenish(void)
{
	pv_hashed_entry_t	pvh_e;
	pv_hashed_entry_t	pvh_eh;
	pv_hashed_entry_t	pvh_et;
	int			pv_cnt;
	unsigned             	i;

	/* We qualify for VM privileges...*/
	current_thread()->options |= TH_OPT_VMPRIV;

	for (;;) {

		while (pv_hashed_kern_free_count < pv_hashed_kern_low_water_mark) {
			pv_cnt = 0;
			pvh_eh = pvh_et = PV_HASHED_ENTRY_NULL;

			for (i = 0; i < pv_hashed_kern_alloc_chunk; i++) {
				pvh_e = (pv_hashed_entry_t) zalloc(pv_hashed_list_zone);
				pvh_e->qlink.next = (queue_entry_t)pvh_eh;
				pvh_eh = pvh_e;

				if (pvh_et == PV_HASHED_ENTRY_NULL)
					pvh_et = pvh_e;
				pv_cnt++;
			}
			pmap_kernel_reserve_replenish_stat += pv_cnt;
			PV_HASHED_KERN_FREE_LIST(pvh_eh, pvh_et, pv_cnt);
		}

		pv_cnt = 0;
		pvh_eh = pvh_et = PV_HASHED_ENTRY_NULL;

		if (pv_hashed_free_count < pv_hashed_low_water_mark) {
			for (i = 0; i < pv_hashed_alloc_chunk; i++) {
				pvh_e = (pv_hashed_entry_t) zalloc(pv_hashed_list_zone);

				pvh_e->qlink.next = (queue_entry_t)pvh_eh;
				pvh_eh = pvh_e;

				if (pvh_et == PV_HASHED_ENTRY_NULL)
					pvh_et = pvh_e;
				pv_cnt++;
			}
			pmap_user_reserve_replenish_stat += pv_cnt;
			PV_HASHED_FREE_LIST(pvh_eh, pvh_et, pv_cnt);
		}
/* Wake threads throttled while the kernel reserve was being replenished.
 */
		if (pmap_pv_throttled_waiters) {
			pmap_pv_throttled_waiters = 0;
			thread_wakeup(&pmap_user_pv_throttle_event);
		}
		/* Check if the kernel pool has been depleted since the
		 * first pass, to reduce refill latency.
		 */
		if (pv_hashed_kern_free_count < pv_hashed_kern_low_water_mark)
			continue;
		/* Block sans continuation to avoid yielding kernel stack */
		assert_wait(&mapping_replenish_event, THREAD_UNINT);
		mappingrecurse = 0;
		thread_block(THREAD_CONTINUE_NULL);
		pmap_mapping_thread_wakeups++;
	}
}

/*
 *	Set specified attribute bits.
 */

void
phys_attribute_set(
	ppnum_t		pn,
	int		bits)
{
	int		pai;

	pmap_intr_assert();
	assert(pn != vm_page_fictitious_addr);
	if (pn == vm_page_guard_addr)
		return;

	pai = ppn_to_pai(pn);

	if (!IS_MANAGED_PAGE(pai)) {
		/* Not a managed page.  */
		return;
	}

	LOCK_PVH(pai);
	pmap_phys_attributes[pai] |= bits;
	UNLOCK_PVH(pai);
}

/*
 *	Set the modify bit on the specified physical page.
 */

void
pmap_set_modify(ppnum_t pn)
{
	phys_attribute_set(pn, PHYS_MODIFIED);
}

/*
 *	Clear the modify bits on the specified physical page.
 */

void
pmap_clear_modify(ppnum_t pn)
{
	phys_attribute_clear(pn, PHYS_MODIFIED);
}

/*
 *	pmap_is_modified:
 *
 *	Return whether or not the specified physical page is modified
 *	by any physical maps.
 */

boolean_t
pmap_is_modified(ppnum_t pn)
{
	if (phys_attribute_test(pn, PHYS_MODIFIED))
		return TRUE;
	return FALSE;
}


/*
 *	pmap_clear_reference:
 *
 *	Clear the reference bit on the specified physical page.
 */

void
pmap_clear_reference(ppnum_t pn)
{
	phys_attribute_clear(pn, PHYS_REFERENCED);
}

void
pmap_set_reference(ppnum_t pn)
{
	phys_attribute_set(pn, PHYS_REFERENCED);
}

/*
 *	pmap_is_referenced:
 *
 *	Return whether or not the specified physical page is referenced
 *	by any physical maps.
 */

boolean_t
pmap_is_referenced(ppnum_t pn)
{
        if (phys_attribute_test(pn, PHYS_REFERENCED))
		return TRUE;
	return FALSE;
}


/*
 * pmap_get_refmod(phys)
 *  returns the referenced and modified bits of the specified
 *  physical page.
 */
unsigned int
pmap_get_refmod(ppnum_t pn)
{
        int		refmod;
	unsigned int	retval = 0;

	refmod = phys_attribute_test(pn, PHYS_MODIFIED | PHYS_REFERENCED);

	if (refmod & PHYS_MODIFIED)
	        retval |= VM_MEM_MODIFIED;
	if (refmod & PHYS_REFERENCED)
	        retval |= VM_MEM_REFERENCED;

	return (retval);
}

/*
 * pmap_clear_refmod(phys, mask)
 *  clears the referenced and modified bits as specified by the mask
 *  of the specified physical page.
 */
void
pmap_clear_refmod(ppnum_t pn, unsigned int mask)
{
	unsigned int  x86Mask;

	x86Mask = (   ((mask &   VM_MEM_MODIFIED)?   PHYS_MODIFIED : 0)
	            | ((mask & VM_MEM_REFERENCED)? PHYS_REFERENCED : 0));
	phys_attribute_clear(pn, x86Mask);
}

/*
 *	Routine:
 *		pmap_disconnect
 *
 *	Function:
 *		Disconnect all mappings for this page and return reference and change status
 *		in generic format.
 *
 */
unsigned int
pmap_disconnect(ppnum_t pa)
{
	unsigned refmod, vmrefmod = 0;

	pmap_page_protect(pa, 0);		/* disconnect the page */

	pmap_assert(pa != vm_page_fictitious_addr);
	if ((pa == vm_page_guard_addr) || !IS_MANAGED_PAGE(pa))
		return 0;
	refmod = pmap_phys_attributes[pa] & (PHYS_MODIFIED | PHYS_REFERENCED);
	
	if (refmod & PHYS_MODIFIED)
	        vmrefmod |= VM_MEM_MODIFIED;
	if (refmod & PHYS_REFERENCED)
	        vmrefmod |= VM_MEM_REFERENCED;

	return vmrefmod;
}
Commit	Line	Data
6d2010ae A	1	/*
	2	* Copyright (c) 2000-2010 Apple Inc. All rights reserved.
	3	*
	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
	25	*
	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
	27	*/
	28	#include <vm/pmap.h>
316670eb	29	#include <kern/ledger.h>
6d2010ae A	30	#include <i386/pmap_internal.h>
6d2010ae A	31
316670eb	32
6d2010ae A	33	/*
	34	* Each entry in the pv_head_table is locked by a bit in the
	35	* pv_lock_table. The lock bits are accessed by the physical
	36	* address of the page they lock.
	37	*/
	38
	39	char pv_lock_table; / pointer to array of bits */
	40	char *pv_hash_lock_table;
	41
	42	pv_rooted_entry_t pv_head_table; /* array of entries, one per
	43	* page */
	44	uint32_t pv_hashed_free_count = 0;
	45	uint32_t pv_hashed_kern_free_count = 0;
	46
	47	pmap_pagetable_corruption_record_t pmap_pagetable_corruption_records[PMAP_PAGETABLE_CORRUPTION_MAX_LOG];
	48	uint32_t pmap_pagetable_corruption_incidents;
	49	uint64_t pmap_pagetable_corruption_last_abstime = (~(0ULL) >> 1);
	50	uint64_t pmap_pagetable_corruption_interval_abstime;
	51	thread_call_t pmap_pagetable_corruption_log_call;
	52	static thread_call_data_t pmap_pagetable_corruption_log_call_data;
	53	boolean_t pmap_pagetable_corruption_timeout = FALSE;
	54
	55	volatile uint32_t mappingrecurse = 0;
	56
	57	uint32_t pv_hashed_low_water_mark, pv_hashed_kern_low_water_mark, pv_hashed_alloc_chunk, pv_hashed_kern_alloc_chunk;
	58
	59	thread_t mapping_replenish_thread;
	60	event_t mapping_replenish_event, pmap_user_pv_throttle_event;
	61
	62	uint64_t pmap_pv_throttle_stat, pmap_pv_throttled_waiters;
	63
	64	unsigned int pmap_cache_attributes(ppnum_t pn) {
	65	if (pmap_get_cache_attributes(pn) & INTEL_PTE_NCACHE)
	66	return (VM_WIMG_IO);
	67	else
	68	return (VM_WIMG_COPYBACK);
	69	}
	70
	71	void pmap_set_cache_attributes(ppnum_t pn, unsigned int cacheattr) {
	72	unsigned int current, template = 0;
	73	int pai;
	74
	75	if (cacheattr & VM_MEM_NOT_CACHEABLE) {
	76	if(!(cacheattr & VM_MEM_GUARDED))
	77	template \|= PHYS_PTA;
	78	template \|= PHYS_NCACHE;
	79	}
	80
	81	pmap_intr_assert();
	82
	83	assert((pn != vm_page_fictitious_addr) && (pn != vm_page_guard_addr));
	84
	85	pai = ppn_to_pai(pn);
	86
	87	if (!IS_MANAGED_PAGE(pai)) {
	88	return;
	89	}
	90
	91	/* override cache attributes for this phys page
	92	* Does not walk through existing mappings to adjust,
	93	* assumes page is disconnected
	94	*/
	95
	96	LOCK_PVH(pai);
97
98	pmap_update_cache_attributes_locked(pn, template);
99
100	current = pmap_phys_attributes[pai] & PHYS_CACHEABILITY_MASK;
101	pmap_phys_attributes[pai] &= ~PHYS_CACHEABILITY_MASK;
102	pmap_phys_attributes[pai] \|= template;
103
104	UNLOCK_PVH(pai);
105
106	if ((template & PHYS_NCACHE) && !(current & PHYS_NCACHE)) {
107	pmap_sync_page_attributes_phys(pn);
108	}
109	}
110
111	unsigned pmap_get_cache_attributes(ppnum_t pn) {
112	if (last_managed_page == 0)
113	return 0;
114
115	if (!IS_MANAGED_PAGE(ppn_to_pai(pn))) {
116	return INTEL_PTE_NCACHE;
117	}
118
119	/*
120	* The cache attributes are read locklessly for efficiency.
121	*/
122	unsigned int attr = pmap_phys_attributes[ppn_to_pai(pn)];
123	unsigned int template = 0;
124
125	if (attr & PHYS_PTA)
126	template \|= INTEL_PTE_PTA;
127	if (attr & PHYS_NCACHE)
128	template \|= INTEL_PTE_NCACHE;
129	return template;
130	}
131
132
133
134	boolean_t
135	pmap_is_noencrypt(ppnum_t pn)
136	{
137	int pai;
138
139	pai = ppn_to_pai(pn);
140
141	if (!IS_MANAGED_PAGE(pai))
7ddcb079	142	return (FALSE);
6d2010ae A	143
	144	if (pmap_phys_attributes[pai] & PHYS_NOENCRYPT)
	145	return (TRUE);
	146
	147	return (FALSE);
	148	}
	149
	150
	151	void
	152	pmap_set_noencrypt(ppnum_t pn)
	153	{
	154	int pai;
	155
	156	pai = ppn_to_pai(pn);
	157
	158	if (IS_MANAGED_PAGE(pai)) {
	159	LOCK_PVH(pai);
	160
	161	pmap_phys_attributes[pai] \|= PHYS_NOENCRYPT;
	162
	163	UNLOCK_PVH(pai);
	164	}
	165	}
	166
	167
	168	void
	169	pmap_clear_noencrypt(ppnum_t pn)
	170	{
	171	int pai;
	172
	173	pai = ppn_to_pai(pn);
	174
	175	if (IS_MANAGED_PAGE(pai)) {
7ddcb079 A	176	/*
	177	* synchronization at VM layer prevents PHYS_NOENCRYPT
	178	* from changing state, so we don't need the lock to inspect
	179	*/
	180	if (pmap_phys_attributes[pai] & PHYS_NOENCRYPT) {
	181	LOCK_PVH(pai);
6d2010ae	182
7ddcb079	183	pmap_phys_attributes[pai] &= ~PHYS_NOENCRYPT;
6d2010ae	184
7ddcb079 A	185	UNLOCK_PVH(pai);
7ddcb079 A	186	}
6d2010ae A	187	}
	188	}
	189
	190	void
	191	compute_pmap_gc_throttle(void *arg __unused)
	192	{
	193
	194	}
	195
	196
	197	__private_extern__ void
	198	pmap_pagetable_corruption_msg_log(int (log_func)(const char fmt, ...)__printflike(1,2)) {
	199	if (pmap_pagetable_corruption_incidents > 0) {
	200	int i, e = MIN(pmap_pagetable_corruption_incidents, PMAP_PAGETABLE_CORRUPTION_MAX_LOG);
	201	(*log_func)("%u pagetable corruption incident(s) detected, timeout: %u\n", pmap_pagetable_corruption_incidents, pmap_pagetable_corruption_timeout);
	202	for (i = 0; i < e; i++) {
	203	(*log_func)("Incident 0x%x, reason: 0x%x, action: 0x%x, time: 0x%llx\n", pmap_pagetable_corruption_records[i].incident, pmap_pagetable_corruption_records[i].reason, pmap_pagetable_corruption_records[i].action, pmap_pagetable_corruption_records[i].abstime);
	204	}
	205	}
	206	}
	207
	208	static inline void
	209	pmap_pagetable_corruption_log_setup(void) {
	210	if (pmap_pagetable_corruption_log_call == NULL) {
	211	nanotime_to_absolutetime(PMAP_PAGETABLE_CORRUPTION_INTERVAL, 0, &pmap_pagetable_corruption_interval_abstime);
	212	thread_call_setup(&pmap_pagetable_corruption_log_call_data,
	213	(thread_call_func_t) pmap_pagetable_corruption_msg_log,
	214	(thread_call_param_t) &printf);
	215	pmap_pagetable_corruption_log_call = &pmap_pagetable_corruption_log_call_data;
	216	}
	217	}
	218
	219	void
	220	mapping_free_prime(void)
	221	{
	222	unsigned i;
	223	pv_hashed_entry_t pvh_e;
	224	pv_hashed_entry_t pvh_eh;
	225	pv_hashed_entry_t pvh_et;
	226	int pv_cnt;
	227
	228	/* Scale based on DRAM size */
	229	pv_hashed_low_water_mark = MAX(PV_HASHED_LOW_WATER_MARK_DEFAULT, ((uint32_t)(sane_size >> 30)) * 2000);
	230	pv_hashed_low_water_mark = MIN(pv_hashed_low_water_mark, 16000);
	231	/* Alterable via sysctl */
	232	pv_hashed_kern_low_water_mark = MAX(PV_HASHED_KERN_LOW_WATER_MARK_DEFAULT, ((uint32_t)(sane_size >> 30)) * 1000);
	233	pv_hashed_kern_low_water_mark = MIN(pv_hashed_kern_low_water_mark, 16000);
	234	pv_hashed_kern_alloc_chunk = PV_HASHED_KERN_ALLOC_CHUNK_INITIAL;
	235	pv_hashed_alloc_chunk = PV_HASHED_ALLOC_CHUNK_INITIAL;
	236
	237	pv_cnt = 0;
	238	pvh_eh = pvh_et = PV_HASHED_ENTRY_NULL;
	239
	240	for (i = 0; i < (5 * PV_HASHED_ALLOC_CHUNK_INITIAL); i++) {
	241	pvh_e = (pv_hashed_entry_t) zalloc(pv_hashed_list_zone);
	242
	243	pvh_e->qlink.next = (queue_entry_t)pvh_eh;
	244	pvh_eh = pvh_e;
	245
	246	if (pvh_et == PV_HASHED_ENTRY_NULL)
	247	pvh_et = pvh_e;
	248	pv_cnt++;
	249	}
	250	PV_HASHED_FREE_LIST(pvh_eh, pvh_et, pv_cnt);
251
252	pv_cnt = 0;
253	pvh_eh = pvh_et = PV_HASHED_ENTRY_NULL;
254	for (i = 0; i < PV_HASHED_KERN_ALLOC_CHUNK_INITIAL; i++) {
255	pvh_e = (pv_hashed_entry_t) zalloc(pv_hashed_list_zone);
256
257	pvh_e->qlink.next = (queue_entry_t)pvh_eh;
258	pvh_eh = pvh_e;
259
260	if (pvh_et == PV_HASHED_ENTRY_NULL)
261	pvh_et = pvh_e;
262	pv_cnt++;
263	}
264	PV_HASHED_KERN_FREE_LIST(pvh_eh, pvh_et, pv_cnt);
265	}
266
267	void mapping_replenish(void);
268
269	void mapping_adjust(void) {
270	kern_return_t mres;
271
272	pmap_pagetable_corruption_log_setup();
273
274	mres = kernel_thread_start_priority((thread_continue_t)mapping_replenish, NULL, MAXPRI_KERNEL, &mapping_replenish_thread);
275	if (mres != KERN_SUCCESS) {
276	panic("pmap: mapping_replenish_thread creation failed");
277	}
278	thread_deallocate(mapping_replenish_thread);
279	}
280
281	unsigned pmap_mapping_thread_wakeups;
282	unsigned pmap_kernel_reserve_replenish_stat;
283	unsigned pmap_user_reserve_replenish_stat;
284	unsigned pmap_kern_reserve_alloc_stat;
285
286	void mapping_replenish(void)
287	{
288	pv_hashed_entry_t pvh_e;
289	pv_hashed_entry_t pvh_eh;
290	pv_hashed_entry_t pvh_et;
291	int pv_cnt;
292	unsigned i;
293
294	/* We qualify for VM privileges...*/
295	current_thread()->options \|= TH_OPT_VMPRIV;
296
297	for (;;) {
298
299	while (pv_hashed_kern_free_count < pv_hashed_kern_low_water_mark) {
300	pv_cnt = 0;
301	pvh_eh = pvh_et = PV_HASHED_ENTRY_NULL;
302
303	for (i = 0; i < pv_hashed_kern_alloc_chunk; i++) {
304	pvh_e = (pv_hashed_entry_t) zalloc(pv_hashed_list_zone);
305	pvh_e->qlink.next = (queue_entry_t)pvh_eh;
306	pvh_eh = pvh_e;
307
308	if (pvh_et == PV_HASHED_ENTRY_NULL)
309	pvh_et = pvh_e;
310	pv_cnt++;
311	}
312	pmap_kernel_reserve_replenish_stat += pv_cnt;
313	PV_HASHED_KERN_FREE_LIST(pvh_eh, pvh_et, pv_cnt);
314	}
315
316	pv_cnt = 0;
317	pvh_eh = pvh_et = PV_HASHED_ENTRY_NULL;
318
319	if (pv_hashed_free_count < pv_hashed_low_water_mark) {
320	for (i = 0; i < pv_hashed_alloc_chunk; i++) {
321	pvh_e = (pv_hashed_entry_t) zalloc(pv_hashed_list_zone);
322
323	pvh_e->qlink.next = (queue_entry_t)pvh_eh;
324	pvh_eh = pvh_e;
325
326	if (pvh_et == PV_HASHED_ENTRY_NULL)
327	pvh_et = pvh_e;
328	pv_cnt++;
329	}
330	pmap_user_reserve_replenish_stat += pv_cnt;
331	PV_HASHED_FREE_LIST(pvh_eh, pvh_et, pv_cnt);
332	}
333	/* Wake threads throttled while the kernel reserve was being replenished.
334	*/
335	if (pmap_pv_throttled_waiters) {
336	pmap_pv_throttled_waiters = 0;
337	thread_wakeup(&pmap_user_pv_throttle_event);
338	}
339	/* Check if the kernel pool has been depleted since the
340	* first pass, to reduce refill latency.
341	*/
342	if (pv_hashed_kern_free_count < pv_hashed_kern_low_water_mark)
343	continue;
344	/* Block sans continuation to avoid yielding kernel stack */
345	assert_wait(&mapping_replenish_event, THREAD_UNINT);
346	mappingrecurse = 0;
347	thread_block(THREAD_CONTINUE_NULL);
348	pmap_mapping_thread_wakeups++;
349	}
350	}
351
352	/*
353	* Set specified attribute bits.
354	*/
355
356	void
357	phys_attribute_set(
358	ppnum_t pn,
359	int bits)
360	{
361	int pai;
362
363	pmap_intr_assert();
364	assert(pn != vm_page_fictitious_addr);
365	if (pn == vm_page_guard_addr)
366	return;
367
368	pai = ppn_to_pai(pn);
369
370	if (!IS_MANAGED_PAGE(pai)) {
371	/* Not a managed page. */
372	return;
373	}
374
375	LOCK_PVH(pai);
376	pmap_phys_attributes[pai] \|= bits;
377	UNLOCK_PVH(pai);
378	}
379
380	/*
381	* Set the modify bit on the specified physical page.
382	*/
383
384	void
385	pmap_set_modify(ppnum_t pn)
386	{
387	phys_attribute_set(pn, PHYS_MODIFIED);
388	}
389
390	/*
391	* Clear the modify bits on the specified physical page.
392	*/
393
394	void
395	pmap_clear_modify(ppnum_t pn)
396	{
397	phys_attribute_clear(pn, PHYS_MODIFIED);
398	}
399
400	/*
401	* pmap_is_modified:
402	*
403	* Return whether or not the specified physical page is modified
404	* by any physical maps.
405	*/
406
407	boolean_t
408	pmap_is_modified(ppnum_t pn)
409	{
410	if (phys_attribute_test(pn, PHYS_MODIFIED))
411	return TRUE;
412	return FALSE;
413	}
414
415
416	/*
417	* pmap_clear_reference:
418	*
419	* Clear the reference bit on the specified physical page.
420	*/
421
422	void
423	pmap_clear_reference(ppnum_t pn)
424	{
425	phys_attribute_clear(pn, PHYS_REFERENCED);
426	}
427
428	void
429	pmap_set_reference(ppnum_t pn)
430	{
431	phys_attribute_set(pn, PHYS_REFERENCED);
432	}
433
434	/*
435	* pmap_is_referenced:
436	*
437	* Return whether or not the specified physical page is referenced
438	* by any physical maps.
439	*/
440
441	boolean_t
442	pmap_is_referenced(ppnum_t pn)
443	{
444	if (phys_attribute_test(pn, PHYS_REFERENCED))
445	return TRUE;
446	return FALSE;
447	}
448
449
450	/*
451	* pmap_get_refmod(phys)
452	* returns the referenced and modified bits of the specified
453	* physical page.
454	*/
455	unsigned int
456	pmap_get_refmod(ppnum_t pn)
457	{
458	int refmod;
459	unsigned int retval = 0;
460
461	refmod = phys_attribute_test(pn, PHYS_MODIFIED \| PHYS_REFERENCED);
462
463	if (refmod & PHYS_MODIFIED)
464	retval \|= VM_MEM_MODIFIED;
465	if (refmod & PHYS_REFERENCED)
466	retval \|= VM_MEM_REFERENCED;
467
468	return (retval);
469	}
470
471	/*
472	* pmap_clear_refmod(phys, mask)
473	* clears the referenced and modified bits as specified by the mask
474	* of the specified physical page.
475	*/
476	void
477	pmap_clear_refmod(ppnum_t pn, unsigned int mask)
478	{
479	unsigned int x86Mask;
480
481	x86Mask = ( ((mask & VM_MEM_MODIFIED)? PHYS_MODIFIED : 0)
482	\| ((mask & VM_MEM_REFERENCED)? PHYS_REFERENCED : 0));
483	phys_attribute_clear(pn, x86Mask);
484	}
485
486	/*
487	* Routine:
488	* pmap_disconnect
489	*
490	* Function:
491	* Disconnect all mappings for this page and return reference and change status
492	* in generic format.
493	*
494	*/
495	unsigned int
496	pmap_disconnect(ppnum_t pa)
497	{
498	unsigned refmod, vmrefmod = 0;
499
500	pmap_page_protect(pa, 0); /* disconnect the page */
501
502	pmap_assert(pa != vm_page_fictitious_addr);
503	if ((pa == vm_page_guard_addr) \|\| !IS_MANAGED_PAGE(pa))
504	return 0;
505	refmod = pmap_phys_attributes[pa] & (PHYS_MODIFIED \| PHYS_REFERENCED);
506
507	if (refmod & PHYS_MODIFIED)
508	vmrefmod \|= VM_MEM_MODIFIED;
509	if (refmod & PHYS_REFERENCED)
510	vmrefmod \|= VM_MEM_REFERENCED;
511
512	return vmrefmod;
513	}