#include <vm/vm_kern.h>
#include <vm/vm_pageout.h>
#include <vm/vm_protos.h>
+#include <mach/sdt.h>
/* Device VM COMPONENT INTERFACES */
* The start of "struct device_pager" MUST match a "struct memory_object".
*/
typedef struct device_pager {
- struct ipc_object_header pager_header; /* fake ip_kotype() */
- memory_object_pager_ops_t pager_ops; /* == &device_pager_ops */
+ /* mandatory generic header */
+ struct memory_object dev_pgr_hdr;
+
+ /* pager-specific data */
+ lck_mtx_t lock;
unsigned int ref_count; /* reference count */
- memory_object_control_t control_handle; /* mem object's cntrl handle */
device_port_t device_handle; /* device_handle */
vm_size_t size;
int flags;
+ boolean_t is_mapped;
} *device_pager_t;
-#define pager_ikot pager_header.io_bits
+lck_grp_t device_pager_lck_grp;
+lck_grp_attr_t device_pager_lck_grp_attr;
+lck_attr_t device_pager_lck_attr;
+#define device_pager_lock_init(pager) \
+ lck_mtx_init(&(pager)->lock, \
+ &device_pager_lck_grp, \
+ &device_pager_lck_attr)
+#define device_pager_lock_destroy(pager) \
+ lck_mtx_destroy(&(pager)->lock, &device_pager_lck_grp)
+#define device_pager_lock(pager) lck_mtx_lock(&(pager)->lock)
+#define device_pager_unlock(pager) lck_mtx_unlock(&(pager)->lock)
device_pager_t
device_pager_lookup( /* forward */
device_pager_zone = zinit(size, (vm_size_t) MAX_DNODE*size,
PAGE_SIZE, "device node pager structures");
zone_change(device_pager_zone, Z_CALLERACCT, FALSE);
+
+ lck_grp_attr_setdefault(&device_pager_lck_grp_attr);
+ lck_grp_init(&device_pager_lck_grp, "device_pager", &device_pager_lck_grp_attr);
+ lck_attr_setdefault(&device_pager_lck_attr);
+
return;
}
int flags)
{
device_pager_t device_object;
+ memory_object_control_t control;
+ vm_object_t object;
device_object = device_object_create();
if (device_object == DEVICE_PAGER_NULL)
device_object->size = size;
device_object->flags = flags;
- return((memory_object_t)device_object);
+ memory_object_create_named((memory_object_t) device_object,
+ size,
+ &control);
+ object = memory_object_control_to_vm_object(control);
+
+ assert(object != VM_OBJECT_NULL);
+ vm_object_lock(object);
+ object->true_share = TRUE;
+ if (object->copy_strategy == MEMORY_OBJECT_COPY_SYMMETRIC) {
+ object->copy_strategy = MEMORY_OBJECT_COPY_DELAY;
+ }
+ vm_object_unlock(object);
+
+ return (memory_object_t)device_object;
}
/*
return KERN_FAILURE;
vm_object = (vm_object_t)memory_object_control_to_vm_object(
- device_object->control_handle);
+ device_object->dev_pgr_hdr.mo_control);
if(vm_object == NULL)
return KERN_FAILURE;
(vm_object_offset_t)offset,
(upl_size_t) size, &upl, NULL,
&null_size,
- (UPL_NO_SYNC | UPL_CLEAN_IN_PLACE));
+ (UPL_NO_SYNC | UPL_CLEAN_IN_PLACE),
+ VM_KERN_MEMORY_NONE);
if(kr != KERN_SUCCESS)
panic("device_pager_populate_object: list_req failed");
*/
device_pager_t
device_pager_lookup(
- memory_object_t name)
+ memory_object_t mem_obj)
{
device_pager_t device_object;
- device_object = (device_pager_t)name;
- assert(device_object->pager_ops == &device_pager_ops);
- return (device_object);
+ assert(mem_obj->mo_pager_ops == &device_pager_ops);
+ device_object = (device_pager_t)mem_obj;
+ assert(device_object->ref_count > 0);
+ return device_object;
}
/*
device_object = device_pager_lookup(mem_obj);
memory_object_control_reference(control);
- device_object->control_handle = control;
+ device_object->dev_pgr_hdr.mo_control = control;
/* The following settings should be done through an expanded change */
device_object = device_pager_lookup(mem_obj);
new_ref_count = hw_atomic_add(&device_object->ref_count, 1);
assert(new_ref_count > 1);
+ DTRACE_VM2(device_pager_reference,
+ device_pager_t, device_object,
+ unsigned int, device_object->ref_count);
+
}
/*
{
device_pager_t device_object;
memory_object_control_t device_control;
+ unsigned int ref_count;
device_object = device_pager_lookup(mem_obj);
+ assert(device_object->ref_count > 0);
+
+ DTRACE_VM2(device_pager_deallocate,
+ device_pager_t, device_object,
+ unsigned int, device_object->ref_count);
+
+ ref_count = hw_atomic_sub(&device_object->ref_count, 1);
+
+ if (ref_count == 1) {
+ /*
+ * The last reference is our "named" reference.
+ * Close the device and "destroy" the VM object.
+ */
+
+ DTRACE_VM2(device_pager_destroy,
+ device_pager_t, device_object,
+ unsigned int, device_object->ref_count);
- if (hw_atomic_sub(&device_object->ref_count, 1) == 0) {
+ assert(device_object->is_mapped == FALSE);
if (device_object->device_handle != (device_port_t) NULL) {
device_close(device_object->device_handle);
device_object->device_handle = (device_port_t) NULL;
}
- device_control = device_object->control_handle;
- if (device_control != MEMORY_OBJECT_CONTROL_NULL) {
- /*
- * The VM object should already have been disconnected
- * from the pager at this point.
- * We still have to release the "memory object control"
- * handle.
- */
- assert(device_control->moc_object == VM_OBJECT_NULL);
- memory_object_control_deallocate(device_control);
- device_object->control_handle =
- MEMORY_OBJECT_CONTROL_NULL;
- }
+ device_control = device_object->dev_pgr_hdr.mo_control;
+ memory_object_destroy(device_control, 0);
+ } else if (ref_count == 0) {
+ /*
+ * No more references: free the pager.
+ */
+ DTRACE_VM2(device_pager_free,
+ device_pager_t, device_object,
+ unsigned int, device_object->ref_count);
+
+ device_pager_lock_destroy(device_object);
zfree(device_pager_zone, device_object);
}
*/
kern_return_t
device_pager_synchronize(
- memory_object_t mem_obj,
- memory_object_offset_t offset,
- memory_object_size_t length,
+ __unused memory_object_t mem_obj,
+ __unused memory_object_offset_t offset,
+ __unused memory_object_size_t length,
__unused vm_sync_t sync_flags)
{
- device_pager_t device_object;
-
- device_object = device_pager_lookup(mem_obj);
-
- memory_object_synchronize_completed(
- device_object->control_handle, offset, length);
-
- return KERN_SUCCESS;
+ panic("device_pager_synchronize: memory_object_synchronize no longer supported\n");
+ return KERN_FAILURE;
}
/*
*/
kern_return_t
device_pager_map(
- __unused memory_object_t mem_obj,
+ memory_object_t mem_obj,
__unused vm_prot_t prot)
{
+ device_pager_t device_object;
+
+ device_object = device_pager_lookup(mem_obj);
+
+ device_pager_lock(device_object);
+ assert(device_object->ref_count > 0);
+ if (device_object->is_mapped == FALSE) {
+ /*
+ * First mapping of this pager: take an extra reference
+ * that will remain until all the mappings of this pager
+ * are removed.
+ */
+ device_object->is_mapped = TRUE;
+ device_pager_reference(mem_obj);
+ }
+ device_pager_unlock(device_object);
+
return KERN_SUCCESS;
}
kern_return_t
device_pager_last_unmap(
- __unused memory_object_t mem_obj)
+ memory_object_t mem_obj)
{
+ device_pager_t device_object;
+ boolean_t drop_ref;
+
+ device_object = device_pager_lookup(mem_obj);
+
+ device_pager_lock(device_object);
+ assert(device_object->ref_count > 0);
+ if (device_object->is_mapped) {
+ device_object->is_mapped = FALSE;
+ drop_ref = TRUE;
+ } else {
+ drop_ref = FALSE;
+ }
+ device_pager_unlock(device_object);
+
+ if (drop_ref) {
+ device_pager_deallocate(mem_obj);
+ }
+
return KERN_SUCCESS;
}
device_object = (struct device_pager *) zalloc(device_pager_zone);
if (device_object == DEVICE_PAGER_NULL)
return(DEVICE_PAGER_NULL);
- device_object->pager_ops = &device_pager_ops;
- device_object->pager_ikot = IKOT_MEMORY_OBJECT;
+
+ bzero(device_object, sizeof (*device_object));
+
+ device_object->dev_pgr_hdr.mo_ikot = IKOT_MEMORY_OBJECT;
+ device_object->dev_pgr_hdr.mo_pager_ops = &device_pager_ops;
+ device_object->dev_pgr_hdr.mo_control = MEMORY_OBJECT_CONTROL_NULL;
+
+ device_pager_lock_init(device_object);
device_object->ref_count = 1;
- device_object->control_handle = MEMORY_OBJECT_CONTROL_NULL;
+ device_object->is_mapped = FALSE;
+ DTRACE_VM2(device_pager_create,
+ device_pager_t, device_object,
+ unsigned int, device_object->ref_count);
return(device_object);
}
projects / apple / xnu.git / blobdiff