*/
#include "default_pager_internal.h"
+#include <mach/memory_object_types.h>
#include <mach/memory_object_server.h>
-#include <vm/vm_pageout.h> /* include for upl_t */
+#include <vm/memory_object.h>
+#include <vm/vm_pageout.h>
/*
*/
struct vstruct_list_head vstruct_list;
-void vstruct_list_insert(vstruct_t vs); /* forward */
-
-void
+__private_extern__ void
vstruct_list_insert(
vstruct_t vs)
{
VSL_UNLOCK();
}
-void vstruct_list_delete(vstruct_t vs); /* forward */
-void
+__private_extern__ void
vstruct_list_delete(
vstruct_t vs)
{
* terminate requests wait for proceeding reads and writes to finish.
*/
-unsigned int default_pager_total = 0; /* debugging */
-unsigned int default_pager_wait_seqno = 0; /* debugging */
-unsigned int default_pager_wait_read = 0; /* debugging */
-unsigned int default_pager_wait_write = 0; /* debugging */
-unsigned int default_pager_wait_refs = 0; /* debugging */
+static unsigned int default_pager_total = 0; /* debugging */
+static unsigned int default_pager_wait_seqno = 0; /* debugging */
+static unsigned int default_pager_wait_read = 0; /* debugging */
+static unsigned int default_pager_wait_write = 0; /* debugging */
+static unsigned int default_pager_wait_refs = 0; /* debugging */
-void vs_async_wait(vstruct_t); /* forward */
-
-void
+__private_extern__ void
vs_async_wait(
vstruct_t vs)
{
- static char here[] = "vs_async_wait";
ASSERT(vs->vs_async_pending >= 0);
while (vs->vs_async_pending > 0) {
vs->vs_waiting_async = TRUE;
- assert_wait(&vs->vs_waiting_async, THREAD_UNINT);
+ assert_wait(&vs->vs_async_pending, THREAD_UNINT);
VS_UNLOCK(vs);
thread_block((void (*)(void))0);
VS_LOCK(vs);
ASSERT(vs->vs_async_pending == 0);
}
-#if PARALLEL
-void vs_lock(vstruct_t, mach_port_seqno_t);
-void vs_unlock(vstruct_t);
-void vs_start_read(vstruct_t);
-void vs_wait_for_readers(vstruct_t);
-void vs_finish_read(vstruct_t);
-void vs_start_write(vstruct_t);
-void vs_wait_for_writers(vstruct_t);
-void vs_finish_write(vstruct_t);
-void vs_wait_for_refs(vstruct_t);
-void vs_finish_refs(vstruct_t);
+#if PARALLEL
/*
* Waits for correct sequence number. Leaves pager locked.
- * JMM - Sequence numbers guarantee ordering, but in a preemptible
- * kernel, they are generated without locks, and so their
- * generation order is undefined (and therefore unreliable).
- * Since we ned to fix this anyway, and I needed to get rid
- * rid of asymmetry in the interface definitions, I have
- * punted this to here.
+ *
+ * JMM - Sequence numbers guarantee ordering of requests generated
+ * by a single thread if the receiver is multithreaded and
+ * the interfaces are asynchronous (i.e. sender can generate
+ * more than one request before the first is received in the
+ * pager). Normally, IPC would generate these number in that
+ * case. But we are trying to avoid using IPC for the in-kernel
+ * scenario. Since these are actually invoked synchronously
+ * anyway (in-kernel), we can just fake the sequence number
+ * generation here (thus avoiding the dependence on IPC).
*/
-void
+__private_extern__ void
vs_lock(
- vstruct_t vs,
- mach_port_seqno_t seqno)
+ vstruct_t vs)
{
+ mach_port_seqno_t seqno;
+
default_pager_total++;
VS_LOCK(vs);
while (vs->vs_seqno != seqno) {
default_pager_wait_seqno++;
vs->vs_waiting_seqno = TRUE;
- assert_wait(&vs->vs_waiting_seqno, THREAD_UNINT);
+ assert_wait(&vs->vs_seqno, THREAD_UNINT);
VS_UNLOCK(vs);
thread_block((void (*)(void))0);
VS_LOCK(vs);
/*
* Increments sequence number and unlocks pager.
*/
-void
+__private_extern__ void
vs_unlock(vstruct_t vs)
{
- boolean_t need_wakeups = vs->vs_waiting_seqno;
-
- vs->vs_waiting_seqno = FALSE;
vs->vs_seqno++;
+ if (vs->vs_waiting_seqno) {
+ vs->vs_waiting_seqno = FALSE;
+ VS_UNLOCK(vs);
+ thread_wakeup(&vs->vs_seqno);
+ return;
+ }
VS_UNLOCK(vs);
- if (need_wakeups)
- thread_wakeup(&vs->vs_waiting_seqno);
}
/*
* Start a read - one more reader. Pager must be locked.
*/
-void
+__private_extern__ void
vs_start_read(
vstruct_t vs)
{
/*
* Wait for readers. Unlocks and relocks pager if wait needed.
*/
-void
+__private_extern__ void
vs_wait_for_readers(
vstruct_t vs)
{
while (vs->vs_readers != 0) {
default_pager_wait_read++;
vs->vs_waiting_read = TRUE;
- assert_wait(&vs->vs_waiting_read, THREAD_UNINT);
+ assert_wait(&vs->vs_readers, THREAD_UNINT);
VS_UNLOCK(vs);
thread_block((void (*)(void))0);
VS_LOCK(vs);
/*
* Finish a read. Pager is unlocked and returns unlocked.
*/
-void
+__private_extern__ void
vs_finish_read(
vstruct_t vs)
{
VS_LOCK(vs);
- if (--vs->vs_readers == 0) {
- boolean_t need_wakeups = vs->vs_waiting_read;
-
+ if (--vs->vs_readers == 0 && vs->vs_waiting_read) {
vs->vs_waiting_read = FALSE;
VS_UNLOCK(vs);
- if (need_wakeups)
- thread_wakeup(&vs->vs_waiting_read);
- } else
- VS_UNLOCK(vs);
+ thread_wakeup(&vs->vs_readers);
+ return;
+ }
+ VS_UNLOCK(vs);
}
/*
* Start a write - one more writer. Pager must be locked.
*/
-void
+__private_extern__ void
vs_start_write(
vstruct_t vs)
{
/*
* Wait for writers. Unlocks and relocks pager if wait needed.
*/
-void
+__private_extern__ void
vs_wait_for_writers(
vstruct_t vs)
{
while (vs->vs_writers != 0) {
default_pager_wait_write++;
vs->vs_waiting_write = TRUE;
- assert_wait(&vs->vs_waiting_write, THREAD_UNINT);
+ assert_wait(&vs->vs_writers, THREAD_UNINT);
VS_UNLOCK(vs);
thread_block((void (*)(void))0);
VS_LOCK(vs);
/* vs_async_wait count non-zero. It will not ocnflict with */
/* other writers on an async basis because it only writes on */
/* a cluster basis into fresh (as of sync time) cluster locations */
-void
+
+__private_extern__ void
vs_wait_for_sync_writers(
vstruct_t vs)
{
while (vs->vs_writers != 0) {
default_pager_wait_write++;
vs->vs_waiting_write = TRUE;
- assert_wait(&vs->vs_waiting_write, THREAD_UNINT);
+ assert_wait(&vs->vs_writers, THREAD_UNINT);
VS_UNLOCK(vs);
thread_block((void (*)(void))0);
VS_LOCK(vs);
/*
* Finish a write. Pager is unlocked and returns unlocked.
*/
-void
+__private_extern__ void
vs_finish_write(
vstruct_t vs)
{
VS_LOCK(vs);
- if (--vs->vs_writers == 0) {
- boolean_t need_wakeups = vs->vs_waiting_write;
-
+ if (--vs->vs_writers == 0 && vs->vs_waiting_write) {
vs->vs_waiting_write = FALSE;
VS_UNLOCK(vs);
- if (need_wakeups)
- thread_wakeup(&vs->vs_waiting_write);
- } else
- VS_UNLOCK(vs);
-}
-
-/*
- * Wait for concurrent default_pager_objects.
- * Unlocks and relocks pager if wait needed.
- */
-void
-vs_wait_for_refs(
- vstruct_t vs)
-{
- while (vs->vs_name_refs == 0) {
- default_pager_wait_refs++;
- vs->vs_waiting_refs = TRUE;
- assert_wait(&vs->vs_waiting_refs, THREAD_UNINT);
- VS_UNLOCK(vs);
- thread_block((void (*)(void))0);
- VS_LOCK(vs);
+ thread_wakeup(&vs->vs_writers);
+ return;
}
+ VS_UNLOCK(vs);
}
-
-/*
- * Finished creating name refs - wake up waiters.
- */
-void
-vs_finish_refs(
- vstruct_t vs)
-{
- boolean_t need_wakeups = vs->vs_waiting_refs;
- vs->vs_waiting_refs = FALSE;
- if (need_wakeups)
- thread_wakeup(&vs->vs_waiting_refs);
-}
-
-#else /* PARALLEL */
-
-#define vs_lock(vs,seqno)
-#define vs_unlock(vs)
-#define vs_start_read(vs)
-#define vs_wait_for_readers(vs)
-#define vs_finish_read(vs)
-#define vs_start_write(vs)
-#define vs_wait_for_writers(vs)
-#define vs_wait_for_sync_writers(vs)
-#define vs_finish_write(vs)
-#define vs_wait_for_refs(vs)
-#define vs_finish_refs(vs)
-
#endif /* PARALLEL */
-vstruct_t vs_object_create(vm_size_t); /* forward */
-
vstruct_t
vs_object_create(
vm_size_t size)
{
vstruct_t vs;
- static char here[] = "vs_object_create";
/*
* Allocate a vstruct. If there are any problems, then report them
return vs;
}
-mach_port_urefs_t default_pager_max_urefs = 10000;
-
-/*
- * Check user reference count on memory object control port.
- * Vstruct must be locked.
- * Unlocks and re-locks vstruct if needs to call kernel.
- */
-void vs_check_request(vstruct_t, MACH_PORT_FACE); /* forward */
-
-void
-vs_check_request(
- vstruct_t vs,
- MACH_PORT_FACE control_port)
-{
- mach_port_delta_t delta;
- kern_return_t kr;
- static char here[] = "vs_check_request";
-
- if (++vs->vs_control_refs > default_pager_max_urefs) {
- delta = 1 - vs->vs_control_refs;
- vs->vs_control_refs = 1;
-
- VS_UNLOCK(vs);
-
- /*
- * Deallocate excess user references.
- */
-
- {
-/* find a better interface for this, what will we use as a component */
- int i;
- delta = -delta;
- for(i=0; i<delta; i++)
- ipc_port_release_send(control_port);
- }
-
- VS_LOCK(vs);
- }
-}
-
+#if 0
void default_pager_add(vstruct_t, boolean_t); /* forward */
void
vstruct_t vs,
boolean_t internal)
{
- MACH_PORT_FACE mem_obj = vs->vs_mem_obj_port;
- MACH_PORT_FACE pset;
+ memory_object_t mem_obj = vs->vs_mem_obj;
+ mach_port_t pset;
mach_port_mscount_t sync;
- MACH_PORT_FACE previous;
+ mach_port_t previous;
kern_return_t kr;
static char here[] = "default_pager_add";
ipc_port_nsrequest(mem_obj, sync, mem_obj, &previous);
}
-
-/*
- * Routine: dp_memory_object_create
- * Purpose:
- * Handle requests for memory objects from the
- * kernel.
- * Notes:
- * Because we only give out the default memory
- * manager port to the kernel, we don't have to
- * be so paranoid about the contents.
- */
-kern_return_t
-dp_memory_object_create(
- MACH_PORT_FACE dmm,
- MACH_PORT_FACE *new_mem_obj,
- vm_size_t new_size)
-{
- mach_port_seqno_t seqno;
- vstruct_t vs;
- MACH_PORT_FACE pager;
- static char here[] = "memory_object_create";
-
- assert(dmm == default_pager_default_port);
-
- vs = vs_object_create(new_size);
- if (vs == VSTRUCT_NULL)
- return KERN_RESOURCE_SHORTAGE;
-
- pager = *new_mem_obj = ipc_port_alloc_kernel();
- assert (pager != IP_NULL);
- (void) ipc_port_make_send(pager);
-
- {
- struct vstruct_alias *alias_struct;
-
- alias_struct = (struct vstruct_alias *)
- kalloc(sizeof(struct vstruct_alias));
- if(alias_struct != NULL) {
- alias_struct->vs = vs;
- alias_struct->name = ISVS;
- pager->alias = (int) alias_struct;
- }
- else Panic("Out of kernel memory");
-
- /* JMM - Add binding to this pager under components */
- pager_mux_hash_insert(pager, &dp_memory_object_subsystem);
- vs->vs_next_seqno = 0;
- pager->ip_receiver = ipc_space_kernel;
- }
-
- /*
- * Set up associations between this port
- * and this default_pager structure
- */
-
- vs->vs_mem_obj_port = pager;
-
- /*
- * After this, other threads might receive requests
- * for this memory object or find it in the port list.
- */
-
- vstruct_list_insert(vs);
- default_pager_add(vs, TRUE);
-
- return KERN_SUCCESS;
-}
+#endif
kern_return_t
dp_memory_object_init(
- MACH_PORT_FACE mem_obj,
- MACH_PORT_FACE control_port,
+ memory_object_t mem_obj,
+ memory_object_control_t control,
vm_size_t pager_page_size)
{
- mach_port_seqno_t seqno;
vstruct_t vs;
- static char here[] = "memory_object_init";
assert(pager_page_size == vm_page_size);
+ memory_object_control_reference(control);
+
vs_lookup(mem_obj, vs);
- vs_lock(vs, seqno);
+ vs_lock(vs);
- if (vs->vs_control_port != MACH_PORT_NULL)
+ if (vs->vs_control != MEMORY_OBJECT_CONTROL_NULL)
Panic("bad request");
- vs->vs_control_port = control_port;
- vs->vs_control_refs = 1;
- vs->vs_object_name = MACH_PORT_NULL;
- vs->vs_name_refs = 1;
-
+ vs->vs_control = control;
vs_unlock(vs);
return KERN_SUCCESS;
kern_return_t
dp_memory_object_synchronize(
- MACH_PORT_FACE mem_obj,
- MACH_PORT_FACE control_port,
- vm_object_offset_t offset,
- vm_offset_t length,
+ memory_object_t mem_obj,
+ memory_object_offset_t offset,
+ vm_size_t length,
vm_sync_t flags)
{
- mach_port_seqno_t seqno;
vstruct_t vs;
- static char here[] = "memory_object_synchronize";
vs_lookup(mem_obj, vs);
- vs_lock(vs, seqno);
- vs_check_request(vs, control_port);
+ vs_lock(vs);
vs_unlock(vs);
- memory_object_synchronize_completed(
- vm_object_lookup(control_port),
- offset, length);
+ memory_object_synchronize_completed(vs->vs_control, offset, length);
return KERN_SUCCESS;
}
+kern_return_t
+dp_memory_object_unmap(
+ memory_object_t mem_obj)
+{
+ panic("dp_memory_object_unmap");
+
+ return KERN_FAILURE;
+}
+
kern_return_t
dp_memory_object_terminate(
- MACH_PORT_FACE mem_obj,
- MACH_PORT_FACE control_port)
+ memory_object_t mem_obj)
{
- mach_port_seqno_t seqno;
+ memory_object_control_t control;
vstruct_t vs;
- mach_port_urefs_t request_refs;
kern_return_t kr;
- static char here[] = "memory_object_terminate";
/*
* control port is a receive right, not a send right.
*/
vs_lookup(mem_obj, vs);
- vs_lock(vs, seqno);
+ vs_lock(vs);
/*
* Wait for read and write requests to terminate.
/*
* After memory_object_terminate both memory_object_init
* and a no-senders notification are possible, so we need
- * to clean up the request and name ports but leave
- * the mem_obj port.
- *
- * A concurrent default_pager_objects might be allocating
- * more references for the name port. In this case,
- * we must first wait for it to finish.
+ * to clean up our reference to the memory_object_control
+ * to prepare for a new init.
*/
- vs_wait_for_refs(vs);
-
- vs->vs_control_port = MACH_PORT_NULL;
+ control = vs->vs_control;
+ vs->vs_control = MEMORY_OBJECT_CONTROL_NULL;
/* a bit of special case ugliness here. Wakeup any waiting reads */
/* these data requests had to be removed from the seqno traffic */
/* synchronous interface. The new async will be able to return */
/* failure during its sync phase. In the mean time ... */
- thread_wakeup(&vs->vs_waiting_write);
- thread_wakeup(&vs->vs_waiting_async);
-
- request_refs = vs->vs_control_refs;
- vs->vs_control_refs = 0;
-
- vs->vs_object_name = MACH_PORT_NULL;
-
- assert(vs->vs_name_refs != 0);
- vs->vs_name_refs = 0;
+ thread_wakeup(&vs->vs_writers);
+ thread_wakeup(&vs->vs_async_pending);
vs_unlock(vs);
/*
- * Now we deallocate our various port rights.
+ * Now we deallocate our reference on the control.
*/
-
- {
- int i;
- for(i=0; i<request_refs; i++)
- ipc_port_release_send(control_port);
- }
- if(control_port->alias != (int)NULL)
- kfree((vm_offset_t) (control_port->alias),
- sizeof(struct vstruct_alias));
- ipc_port_release_receive(control_port);
+ memory_object_control_deallocate(control);
return KERN_SUCCESS;
}
void
-default_pager_no_senders(
- MACH_PORT_FACE mem_obj,
- mach_port_seqno_t seqno,
- mach_port_mscount_t mscount)
+dp_memory_object_reference(
+ memory_object_t mem_obj)
+{
+ vstruct_t vs;
+
+ vs_lookup_safe(mem_obj, vs);
+ if (vs == VSTRUCT_NULL)
+ return;
+
+ VS_LOCK(vs);
+ assert(vs->vs_references > 0);
+ vs->vs_references++;
+ VS_UNLOCK(vs);
+}
+
+extern ipc_port_t max_pages_trigger_port;
+extern int dp_pages_free;
+extern int maximum_pages_free;
+void
+dp_memory_object_deallocate(
+ memory_object_t mem_obj)
{
vstruct_t vs;
- static char here[] = "default_pager_no_senders";
+ mach_port_seqno_t seqno;
+ ipc_port_t trigger;
/*
- * Because we don't give out multiple send rights
+ * Because we don't give out multiple first references
* for a memory object, there can't be a race
- * between getting a no-senders notification
- * and creating a new send right for the object.
- * Hence we don't keep track of mscount.
+ * between getting a deallocate call and creating
+ * a new reference for the object.
*/
- vs_lookup(mem_obj, vs);
- vs_lock(vs, seqno);
+ vs_lookup_safe(mem_obj, vs);
+ if (vs == VSTRUCT_NULL)
+ return;
+
+ VS_LOCK(vs);
+ if (--vs->vs_references > 0) {
+ VS_UNLOCK(vs);
+ return;
+ }
+
+ seqno = vs->vs_next_seqno++;
+ while (vs->vs_seqno != seqno) {
+ default_pager_wait_seqno++;
+ vs->vs_waiting_seqno = TRUE;
+ assert_wait(&vs->vs_seqno, THREAD_UNINT);
+ VS_UNLOCK(vs);
+ thread_block((void (*)(void))0);
+ VS_LOCK(vs);
+ }
+
vs_async_wait(vs); /* wait for pending async IO */
/* do not delete the vs structure until the referencing pointers */
VS_LOCK(vs);
vs_async_wait(vs); /* wait for pending async IO */
}
+
+
/*
- * We shouldn't get a no-senders notification
+ * We shouldn't get a deallocation call
* when the kernel has the object cached.
*/
- if (vs->vs_control_port != MACH_PORT_NULL)
+ if (vs->vs_control != MEMORY_OBJECT_CONTROL_NULL)
Panic("bad request");
/*
*/
VS_UNLOCK(vs);
+ /* Lock out paging segment removal for the duration of this */
+ /* call. We are vulnerable to losing a paging segment we rely */
+ /* on as soon as we remove ourselves from the VSL and unlock */
+
+ /* Keep our thread from blocking on attempt to trigger backing */
+ /* store release */
+ backing_store_release_trigger_disable += 1;
+
/*
* Remove the memory object port association, and then
* the destroy the port itself. We must remove the object
* because of default_pager_objects.
*/
vstruct_list_delete(vs);
+ VSL_UNLOCK();
+
ps_vstruct_dealloc(vs);
- /*
- * Recover memory that we might have wasted because
- * of name conflicts
- */
- while (!queue_empty(&vstruct_list.vsl_leak_queue)) {
- vs = (vstruct_t) queue_first(&vstruct_list.vsl_leak_queue);
- queue_remove_first(&vstruct_list.vsl_leak_queue, vs, vstruct_t,
- vs_links);
- kfree((vm_offset_t) vs, sizeof *vs);
+ VSL_LOCK();
+ backing_store_release_trigger_disable -= 1;
+ if(backing_store_release_trigger_disable == 0) {
+ thread_wakeup((event_t)&vm_page_laundry_count);
}
VSL_UNLOCK();
+
+ PSL_LOCK();
+ if(max_pages_trigger_port
+ && (backing_store_release_trigger_disable == 0)
+ && (dp_pages_free > maximum_pages_free)) {
+ trigger = max_pages_trigger_port;
+ max_pages_trigger_port = NULL;
+ } else
+ trigger = IP_NULL;
+ PSL_UNLOCK();
+
+ if (trigger != IP_NULL) {
+ default_pager_space_alert(trigger, LO_WAT_ALERT);
+ ipc_port_release_send(trigger);
+ }
+
}
kern_return_t
dp_memory_object_data_request(
- MACH_PORT_FACE mem_obj,
- MACH_PORT_FACE reply_to,
- vm_object_offset_t offset,
+ memory_object_t mem_obj,
+ memory_object_offset_t offset,
vm_size_t length,
vm_prot_t protection_required)
{
- mach_port_seqno_t seqno;
vstruct_t vs;
- static char here[] = "memory_object_data_request";
GSTAT(global_stats.gs_pagein_calls++);
/* port. As we are expanding this pager to support user interfaces */
/* this should be changed to return kern_failure */
vs_lookup(mem_obj, vs);
- vs_lock(vs, seqno);
- vs_check_request(vs, reply_to);
+ vs_lock(vs);
/* We are going to relax the strict sequencing here for performance */
/* reasons. We can do this because we know that the read and */
/* of read and write requests at the cache memory_object level */
/* break out wait_for_writers, all of this goes away when */
/* we get real control of seqno with the new component interface */
+
if (vs->vs_writers != 0) {
/* you can't hold on to the seqno and go */
/* to sleep like that */
while (vs->vs_writers != 0) {
default_pager_wait_write++;
vs->vs_waiting_write = TRUE;
- assert_wait(&vs->vs_waiting_write, THREAD_UNINT);
+ assert_wait(&vs->vs_writers, THREAD_UNINT);
VS_UNLOCK(vs);
thread_block((void (*)(void))0);
VS_LOCK(vs);
vs_async_wait(vs);
}
- if(vs->vs_control_port == MACH_PORT_NULL) {
+ if(vs->vs_control == MEMORY_OBJECT_CONTROL_NULL) {
VS_UNLOCK(vs);
return KERN_FAILURE;
}
kern_return_t
dp_memory_object_data_initialize(
- MACH_PORT_FACE mem_obj,
- MACH_PORT_FACE control_port,
- vm_object_offset_t offset,
- pointer_t addr,
- vm_size_t data_cnt)
+ memory_object_t mem_obj,
+ memory_object_offset_t offset,
+ vm_size_t size)
{
- mach_port_seqno_t seqno;
vstruct_t vs;
- static char here[] = "memory_object_data_initialize";
-
-#ifdef lint
- control_port++;
-#endif /* lint */
DEBUG(DEBUG_MO_EXTERNAL,
("mem_obj=0x%x,offset=0x%x,cnt=0x%x\n",
- (int)mem_obj, (int)offset, (int)data_cnt));
- GSTAT(global_stats.gs_pages_init += atop(data_cnt));
+ (int)mem_obj, (int)offset, (int)size));
+ GSTAT(global_stats.gs_pages_init += atop(size));
vs_lookup(mem_obj, vs);
- vs_lock(vs, seqno);
- vs_check_request(vs, control_port);
+ vs_lock(vs);
vs_start_write(vs);
vs_unlock(vs);
* loop if the address range specified crosses cluster
* boundaries.
*/
- vs_cluster_write(vs, 0, (vm_offset_t)offset, data_cnt, FALSE, 0);
+ vs_cluster_write(vs, 0, (vm_offset_t)offset, size, FALSE, 0);
vs_finish_write(vs);
return KERN_SUCCESS;
}
-kern_return_t
-dp_memory_object_lock_completed(
- memory_object_t mem_obj,
- MACH_PORT_FACE control_port,
- vm_object_offset_t offset,
- vm_size_t length)
-{
- mach_port_seqno_t seqno;
- static char here[] = "memory_object_lock_completed";
-
-#ifdef lint
- mem_obj++;
- seqno++;
- control_port++;
- offset++;
- length++;
-#endif /* lint */
-
- Panic("illegal");
- return KERN_FAILURE;
-}
-
kern_return_t
dp_memory_object_data_unlock(
memory_object_t mem_obj,
- MACH_PORT_FACE control_port,
- vm_object_offset_t offset,
- vm_size_t data_cnt,
+ memory_object_offset_t offset,
+ vm_size_t size,
vm_prot_t desired_access)
{
- static char here[] = "memory_object_data_unlock";
-
- Panic("illegal");
+ Panic("dp_memory_object_data_unlock: illegal");
return KERN_FAILURE;
}
-kern_return_t
-dp_memory_object_supply_completed(
- memory_object_t mem_obj,
- MACH_PORT_FACE control_port,
- vm_object_offset_t offset,
- vm_size_t length,
- kern_return_t result,
- vm_offset_t error_offset)
-{
- static char here[] = "memory_object_supply_completed";
-
- Panic("illegal");
- return KERN_FAILURE;
-}
-
kern_return_t
dp_memory_object_data_return(
- MACH_PORT_FACE mem_obj,
- MACH_PORT_FACE control_port,
- vm_object_offset_t offset,
- pointer_t addr,
- vm_size_t data_cnt,
+ memory_object_t mem_obj,
+ memory_object_offset_t offset,
+ vm_size_t size,
boolean_t dirty,
boolean_t kernel_copy)
{
- mach_port_seqno_t seqno;
vstruct_t vs;
- static char here[] = "memory_object_data_return";
-
-#ifdef lint
- control_port++;
- dirty++;
- kernel_copy++;
-#endif /* lint */
DEBUG(DEBUG_MO_EXTERNAL,
- ("mem_obj=0x%x,offset=0x%x,addr=0x%xcnt=0x%x\n",
- (int)mem_obj, (int)offset, (int)addr, (int)data_cnt));
+ ("mem_obj=0x%x,offset=0x%x,size=0x%x\n",
+ (int)mem_obj, (int)offset, (int)size));
GSTAT(global_stats.gs_pageout_calls++);
/* This routine is called by the pageout thread. The pageout thread */
/* a synchronous interface */
/* return KERN_LOCK_OWNED; */
upl_t upl;
- upl_system_list_request((vm_object_t)
- vs->vs_control_port->ip_kobject,
- offset, data_cnt, data_cnt, &upl, NULL, 0,
- UPL_NOBLOCK | UPL_CLEAN_IN_PLACE
+ int page_list_count = 0;
+ memory_object_super_upl_request(vs->vs_control,
+ (memory_object_offset_t)offset,
+ size, size,
+ &upl, NULL, &page_list_count,
+ UPL_NOBLOCK | UPL_CLEAN_IN_PLACE
| UPL_NO_SYNC | UPL_COPYOUT_FROM);
- uc_upl_abort(upl,0);
- ipc_port_release_send(control_port);
+ upl_abort(upl,0);
+ upl_deallocate(upl);
return KERN_SUCCESS;
}
-
-
if ((vs->vs_seqno != vs->vs_next_seqno++) || (vs->vs_xfer_pending)) {
upl_t upl;
+ int page_list_count = 0;
+
vs->vs_next_seqno--;
VS_UNLOCK(vs);
+
/* the call below will not be done by caller when we have */
/* a synchronous interface */
/* return KERN_LOCK_OWNED; */
- upl_system_list_request((vm_object_t)
- vs->vs_control_port->ip_kobject,
- offset, data_cnt, data_cnt, &upl, NULL, 0,
+ memory_object_super_upl_request(vs->vs_control,
+ (memory_object_offset_t)offset,
+ size, size,
+ &upl, NULL, &page_list_count,
UPL_NOBLOCK | UPL_CLEAN_IN_PLACE
| UPL_NO_SYNC | UPL_COPYOUT_FROM);
- uc_upl_abort(upl,0);
- ipc_port_release_send(control_port);
+ upl_abort(upl,0);
+ upl_deallocate(upl);
return KERN_SUCCESS;
}
- if ((data_cnt % vm_page_size) != 0)
+ if ((size % vm_page_size) != 0)
Panic("bad alignment");
vs_start_write(vs);
vs->vs_async_pending += 1; /* protect from backing store contraction */
-
- /* unroll vs_check_request to avoid re-locking vs */
-
- if (++vs->vs_control_refs > default_pager_max_urefs) {
- mach_port_delta_t delta;
-
- delta = 1 - vs->vs_control_refs;
- vs->vs_control_refs = 1;
-
- vs_unlock(vs);
-
- /*
- * Deallocate excess user references.
- */
-
- {
- int i;
- delta = -delta;
- for(i=0; i<delta; i++)
- ipc_port_release_send(control_port);
- }
-
- } else {
- vs_unlock(vs);
- }
+ vs_unlock(vs);
/*
* Write the data via clustered writes. vs_cluster_write will
* loop if the address range specified crosses cluster
* boundaries.
*/
- vs_cluster_write(vs, 0, (vm_offset_t)offset, data_cnt, FALSE, 0);
+ vs_cluster_write(vs, 0, (vm_offset_t)offset, size, FALSE, 0);
vs_finish_write(vs);
VS_LOCK(vs);
vs->vs_async_pending -= 1; /* release vs_async_wait */
- if (vs->vs_async_pending == 0) {
+ if (vs->vs_async_pending == 0 && vs->vs_waiting_async) {
+ vs->vs_waiting_async = FALSE;
VS_UNLOCK(vs);
- thread_wakeup(&vs->vs_waiting_async);
+ thread_wakeup(&vs->vs_async_pending);
} else {
VS_UNLOCK(vs);
}
return KERN_SUCCESS;
}
+/*
+ * Routine: default_pager_memory_object_create
+ * Purpose:
+ * Handle requests for memory objects from the
+ * kernel.
+ * Notes:
+ * Because we only give out the default memory
+ * manager port to the kernel, we don't have to
+ * be so paranoid about the contents.
+ */
kern_return_t
-dp_memory_object_change_completed(
- memory_object_t mem_obj,
- memory_object_control_t memory_control,
- memory_object_flavor_t flavor)
+default_pager_memory_object_create(
+ memory_object_default_t dmm,
+ vm_size_t new_size,
+ memory_object_t *new_mem_obj)
{
- static char here[] = "memory_object_change_completed";
+ vstruct_t vs;
- Panic("illegal");
- return KERN_FAILURE;
+ assert(dmm == default_pager_object);
+
+ vs = vs_object_create(new_size);
+ if (vs == VSTRUCT_NULL)
+ return KERN_RESOURCE_SHORTAGE;
+
+ vs->vs_next_seqno = 0;
+
+ /*
+ * Set up associations between this memory object
+ * and this default_pager structure
+ */
+
+ vs->vs_mem_obj = ISVS;
+ vs->vs_mem_obj_ikot = IKOT_MEMORY_OBJECT;
+
+ /*
+ * After this, other threads might receive requests
+ * for this memory object or find it in the port list.
+ */
+
+ vstruct_list_insert(vs);
+ *new_mem_obj = vs_to_mem_obj(vs);
+ return KERN_SUCCESS;
}
/*
*/
kern_return_t
default_pager_object_create(
- MACH_PORT_FACE pager,
- MACH_PORT_FACE *mem_obj,
- vm_size_t size)
+ default_pager_t pager,
+ vm_size_t size,
+ memory_object_t *mem_objp)
{
vstruct_t vs;
- MACH_PORT_FACE port;
kern_return_t result;
struct vstruct_alias *alias_struct;
- static char here[] = "default_pager_object_create";
- if (pager != default_pager_default_port)
+ if (pager != default_pager_object)
return KERN_INVALID_ARGUMENT;
vs = vs_object_create(size);
+ if (vs == VSTRUCT_NULL)
+ return KERN_RESOURCE_SHORTAGE;
- port = ipc_port_alloc_kernel();
- ipc_port_make_send(port);
- /* register abstract memory object port with pager mux routine */
- /* (directs kernel internal calls to the right pager). */
- alias_struct = (struct vstruct_alias *)
- kalloc(sizeof(struct vstruct_alias));
- if(alias_struct != NULL) {
- alias_struct->vs = vs;
- alias_struct->name = ISVS;
- port->alias = (int) alias_struct;
- }
- else Panic("Out of kernel memory");
-
/*
- * Set up associations between these ports
+ * Set up associations between the default pager
* and this vstruct structure
*/
-
- vs->vs_mem_obj_port = port;
+ vs->vs_mem_obj = ISVS;
vstruct_list_insert(vs);
- default_pager_add(vs, FALSE);
-
- *mem_obj = port;
-
+ *mem_objp = vs_to_mem_obj(vs);
return KERN_SUCCESS;
}
kern_return_t
default_pager_objects(
- MACH_PORT_FACE pager,
+ default_pager_t pager,
default_pager_object_array_t *objectsp,
mach_msg_type_number_t *ocountp,
- mach_port_array_t *portsp,
+ memory_object_array_t *pagersp,
mach_msg_type_number_t *pcountp)
{
vm_offset_t oaddr = 0; /* memory for objects */
default_pager_object_t * objects;
unsigned int opotential;
- vm_offset_t paddr = 0; /* memory for ports */
+ vm_offset_t paddr = 0; /* memory for pagers */
vm_size_t psize = 0; /* current size */
- MACH_PORT_FACE * ports;
+ memory_object_t * pagers;
unsigned int ppotential;
unsigned int actual;
unsigned int num_objects;
kern_return_t kr;
vstruct_t entry;
- static char here[] = "default_pager_objects";
/*
if (pager != default_pager_default_port)
return KERN_INVALID_ARGUMENT;
num_objects = 0;
opotential = *ocountp;
- ports = (MACH_PORT_FACE *) *portsp;
+ pagers = (memory_object_t *) *pagersp;
ppotential = *pcountp;
VSL_LOCK();
vm_offset_t newaddr;
vm_size_t newsize;
- newsize = 2 * round_page(actual * sizeof * ports);
+ newsize = 2 * round_page(actual * sizeof * pagers);
kr = vm_allocate(kernel_map, &newaddr, newsize, TRUE);
if (kr != KERN_SUCCESS)
paddr = newaddr;
psize = newsize;
- ppotential = psize / sizeof * ports;
- ports = (MACH_PORT_FACE *)paddr;
+ ppotential = psize / sizeof * pagers;
+ pagers = (memory_object_t *)paddr;
}
/*
num_objects = 0;
queue_iterate(&vstruct_list.vsl_queue, entry, vstruct_t, vs_links) {
- MACH_PORT_FACE port;
+ memory_object_t pager;
vm_size_t size;
if ((num_objects >= opotential) ||
VS_LOCK(entry);
- port = entry->vs_object_name;
- if (port == MACH_PORT_NULL) {
-
- /*
- * The object is waiting for no-senders
- * or memory_object_init.
- */
- VS_UNLOCK(entry);
- goto not_this_one;
- }
-
/*
- * We need a reference for the reply message.
- * While we are unlocked, the bucket queue
- * can change and the object might be terminated.
- * memory_object_terminate will wait for us,
- * preventing deallocation of the entry.
+ * We need a reference for our caller. Adding this
+ * reference through the linked list could race with
+ * destruction of the object. If we find the object
+ * has no references, just give up on it.
*/
-
- if (--entry->vs_name_refs == 0) {
+ VS_LOCK(entry);
+ if (entry->vs_references == 0) {
VS_UNLOCK(entry);
-
- /* keep the list locked, wont take long */
-
- {
- int i;
- for(i=0; i<default_pager_max_urefs; i++)
- ipc_port_make_send(port);
- }
- VS_LOCK(entry);
-
- entry->vs_name_refs += default_pager_max_urefs;
- vs_finish_refs(entry);
+ goto not_this_one;
}
+ dp_memory_object_reference(vs_to_mem_obj(entry));
VS_UNLOCK(entry);
/* the arrays are wired, so no deadlock worries */
objects[num_objects].dpo_object = (vm_offset_t) entry;
objects[num_objects].dpo_size = size;
- ports [num_objects++] = port;
+ pagers [num_objects++] = pager;
continue;
not_this_one:
*/
objects[num_objects].dpo_object = (vm_offset_t) 0;
objects[num_objects].dpo_size = 0;
- ports [num_objects++] = MACH_PORT_NULL;
+ pagers[num_objects++] = MEMORY_OBJECT_NULL;
}
*ocountp = num_objects;
}
- if (ports == (MACH_PORT_FACE *)*portsp) {
+ if (pagers == (memory_object_t *)*pagersp) {
/*
* Our returned information fit inline.
} else {
vm_offset_t used;
- used = round_page(actual * sizeof * ports);
+ used = round_page(actual * sizeof * pagers);
if (used != psize)
(void) vm_deallocate(kernel_map,
paddr + used, psize - used);
- *portsp = (mach_port_array_t)ports;
+ *pagersp = (memory_object_array_t)pagers;
*pcountp = num_objects;
}
(void) vm_map_unwire(kernel_map, (vm_offset_t)objects,
{
register int i;
for (i = 0; i < num_objects; i++)
- ipc_port_dealloc_kernel(ports[i]);
+ if (pagers[i] != MEMORY_OBJECT_NULL)
+ memory_object_deallocate(pagers[i]);
}
if (objects != *objectsp)
(void) vm_deallocate(kernel_map, oaddr, osize);
- if (ports != (MACH_PORT_FACE *)*portsp)
+ if (pagers != (memory_object_t *)*pagersp)
(void) vm_deallocate(kernel_map, paddr, psize);
return KERN_RESOURCE_SHORTAGE;
kern_return_t
default_pager_object_pages(
- MACH_PORT_FACE pager,
- MACH_PORT_FACE object,
+ default_pager_t pager,
+ memory_object_t object,
default_pager_page_array_t *pagesp,
mach_msg_type_number_t *countp)
{
unsigned int potential, actual;
kern_return_t kr;
-/*
- if (pager != default_pager_default_port)
+
+ if (pager != default_pager_object)
return KERN_INVALID_ARGUMENT;
-*/
+
kr = vm_map_copyout(ipc_kernel_map, (vm_offset_t *)&pages,
(vm_map_copy_t) *pagesp);
queue_iterate(&vstruct_list.vsl_queue, entry, vstruct_t,
vs_links) {
VS_LOCK(entry);
- if (entry->vs_object_name == object) {
+ if (vs_to_mem_obj(entry) == object) {
VSL_UNLOCK();
goto found_object;
}
projects / apple / xnu.git / blobdiff