xnu-4570.1.46.tar.gz

[apple/xnu.git] / osfmk / vm / device_vm.c

diff --git a/osfmk/vm/device_vm.c b/osfmk/vm/device_vm.c
index 7b4c8f161b9ad9d18acd093b772d0481603e0c6d..c4f953e1caf758292171fa9f03ab8cc64e121563 100644 (file)
--- a/osfmk/vm/device_vm.c
+++ b/osfmk/vm/device_vm.c
@@ -48,6 +48,7 @@
 #include <vm/vm_kern.h>
 #include <vm/vm_pageout.h>
 #include <vm/vm_protos.h>
 #include <vm/vm_kern.h>
 #include <vm/vm_pageout.h>
 #include <vm/vm_protos.h>

+#include <mach/sdt.h>

 
 
 /* Device VM COMPONENT INTERFACES */
 
 
 /* Device VM COMPONENT INTERFACES */


@@ -85,17 +86,30 @@ typedef uintptr_t device_port_t;
  * The start of "struct device_pager" MUST match a "struct memory_object".
  */
 typedef struct device_pager {
  * 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              */
        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;
        device_port_t   device_handle;  /* device_handle */
        vm_size_t       size;
        int             flags;

+       boolean_t       is_mapped;

 } *device_pager_t;
 
 } *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_t
 device_pager_lookup(           /* forward */


@@ -122,12 +136,17 @@ zone_t    device_pager_zone;
 void
 device_pager_bootstrap(void)
 {
 void
 device_pager_bootstrap(void)
 {

-       register vm_size_t      size;
+       vm_size_t      size;

 
        size = (vm_size_t) sizeof(struct device_pager);
        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);
 
        size = (vm_size_t) sizeof(struct device_pager);
        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;
 }
 
        return;
 }
 


@@ -142,6 +161,8 @@ device_pager_setup(
        int             flags)
 {
        device_pager_t  device_object;
        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 = device_object_create();
        if (device_object == DEVICE_PAGER_NULL)


@@ -151,7 +172,20 @@ device_pager_setup(
        device_object->size = size;
        device_object->flags = flags;
 
        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;

 }
 
 /*
 }
 
 /*


@@ -174,7 +208,7 @@ device_pager_populate_object(
                return KERN_FAILURE;
 
        vm_object = (vm_object_t)memory_object_control_to_vm_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;
 
        if(vm_object == NULL) 
                return KERN_FAILURE;
 


@@ -190,7 +224,8 @@ device_pager_populate_object(
                                           (vm_object_offset_t)offset,
                                           (upl_size_t) size, &upl,  NULL,
                                           &null_size,
                                           (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");
 
                if(kr != KERN_SUCCESS)
                        panic("device_pager_populate_object: list_req failed");
 


@@ -207,13 +242,14 @@ device_pager_populate_object(
  */
 device_pager_t
 device_pager_lookup(
  */
 device_pager_t
 device_pager_lookup(

-       memory_object_t name)
+       memory_object_t mem_obj)

 {
        device_pager_t  device_object;
 
 {
        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;

 }
 
 /*
 }
 
 /*


@@ -238,7 +274,7 @@ device_pager_init(
        device_object = device_pager_lookup(mem_obj);
 
        memory_object_control_reference(control);
        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 */
 
 
 /* The following settings should be done through an expanded change */


@@ -337,6 +373,10 @@ device_pager_reference(
        device_object = device_pager_lookup(mem_obj);
        new_ref_count = hw_atomic_add(&device_object->ref_count, 1);
        assert(new_ref_count > 1);
        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);
+

 }
 
 /*
 }
 
 /*


@@ -348,27 +388,43 @@ device_pager_deallocate(
 {
        device_pager_t          device_object;
        memory_object_control_t device_control;
 {
        device_pager_t          device_object;
        memory_object_control_t device_control;

+       unsigned int            ref_count;

 
        device_object = device_pager_lookup(mem_obj);
 
        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 (hw_atomic_sub(&device_object->ref_count, 1) == 0) {
+       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);
+
+               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;
                }
                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);
        }
 
                zfree(device_pager_zone, device_object);
        }


@@ -409,19 +465,13 @@ device_pager_terminate(
  */
 kern_return_t
 device_pager_synchronize(
  */
 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)
 {
        __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;

 }
 
 /*
 }
 
 /*


@@ -429,16 +479,52 @@ device_pager_synchronize(
  */
 kern_return_t
 device_pager_map(
  */
 kern_return_t
 device_pager_map(

-       __unused memory_object_t        mem_obj,
+       memory_object_t mem_obj,

        __unused vm_prot_t              prot)
 {
        __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(
        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;
 }
 
        return KERN_SUCCESS;
 }
 


@@ -450,17 +536,34 @@ device_pager_last_unmap(
 device_pager_t
 device_object_create(void)
 {
 device_pager_t
 device_object_create(void)
 {

-       register device_pager_t  device_object;
+       device_pager_t  device_object;

 
        device_object = (struct device_pager *) zalloc(device_pager_zone);
        if (device_object == DEVICE_PAGER_NULL)
                return(DEVICE_PAGER_NULL);
 
        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->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);
 }
 
 
        return(device_object);
 }
 

+boolean_t
+is_device_pager_ops(const struct memory_object_pager_ops *pager_ops)
+{
+       if (pager_ops == &device_pager_ops) {
+               return TRUE;
+       }
+       return FALSE;
+}