X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/55e303ae13a4cf49d70f2294092726f2fffb9ef2..5ba3f43ea354af8ad55bea84372a2bc834d8757c:/osfmk/vm/device_vm.c diff --git a/osfmk/vm/device_vm.c b/osfmk/vm/device_vm.c index bbc1726db..c4f953e1c 100644 --- a/osfmk/vm/device_vm.c +++ b/osfmk/vm/device_vm.c @@ -1,16 +1,19 @@ /* - * Copyright (c) 2000-2001 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved. * - * @APPLE_LICENSE_HEADER_START@ - * - * Copyright (c) 1999-2003 Apple Computer, 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. Please obtain a copy of the License at - * http://www.opensource.apple.com/apsl/ and read it before using this - * file. + * 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 @@ -20,24 +23,33 @@ * Please see the License for the specific language governing rights and * limitations under the License. * - * @APPLE_LICENSE_HEADER_END@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ #include -#include + #include -#include -#include -#include #include +#include #include #include #include +#include +#include +#include +#include +#include #include #include -#include #include +#include #include +#include +#include +#include +#include +#include + /* Device VM COMPONENT INTERFACES */ @@ -52,98 +64,59 @@ /* until component support available */ -int device_pager_workaround; - -typedef int device_port_t; +const struct memory_object_pager_ops device_pager_ops = { + device_pager_reference, + device_pager_deallocate, + device_pager_init, + device_pager_terminate, + device_pager_data_request, + device_pager_data_return, + device_pager_data_initialize, + device_pager_data_unlock, + device_pager_synchronize, + device_pager_map, + device_pager_last_unmap, + NULL, /* data_reclaim */ + "device pager" +}; + +typedef uintptr_t device_port_t; +/* + * The start of "struct device_pager" MUST match a "struct memory_object". + */ typedef struct device_pager { - int *pager; /* pager workaround pointer */ - unsigned int pager_ikot; /* fake ip_kotype() */ + /* 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; +lck_grp_t device_pager_lck_grp; +lck_grp_attr_t device_pager_lck_grp_attr; +lck_attr_t device_pager_lck_attr; - -void -device_pager_bootstrap( - void); - - -memory_object_t -device_pager_setup( - memory_object_t, - int, - vm_size_t, - int); +#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( - memory_object_t); - -kern_return_t -device_pager_init( - memory_object_t, - memory_object_control_t, - vm_size_t); - - -kern_return_t -device_pager_data_request( - memory_object_t, - memory_object_offset_t, - vm_size_t, - vm_prot_t); - -kern_return_t -device_pager_data_return( - memory_object_t, - memory_object_offset_t, - vm_size_t, - boolean_t, - boolean_t); - -void -device_pager_reference( - memory_object_t); - -void -device_pager_deallocate( - memory_object_t); - -kern_return_t -device_pager_data_initialize( - memory_object_t, - memory_object_offset_t, - vm_size_t); - -kern_return_t -device_pager_data_unlock( - memory_object_t, - memory_object_offset_t, - vm_size_t, - vm_prot_t); - -kern_return_t -device_pager_terminate( - memory_object_t); - -kern_return_t -device_pager_synchronize( - memory_object_t, - memory_object_offset_t, - vm_offset_t, - vm_sync_t); - -kern_return_t -device_pager_unmap( +device_pager_lookup( /* forward */ memory_object_t); device_pager_t -device_object_create(void); +device_object_create(void); /* forward */ zone_t device_pager_zone; @@ -163,11 +136,16 @@ zone_t device_pager_zone; 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); + + 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; } @@ -177,12 +155,14 @@ device_pager_bootstrap(void) */ memory_object_t device_pager_setup( - memory_object_t device, - int device_handle, + __unused memory_object_t device, + uintptr_t device_handle, vm_size_t size, 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) @@ -192,7 +172,20 @@ device_pager_setup( 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; } /* @@ -209,14 +202,13 @@ device_pager_populate_object( vm_object_t vm_object; kern_return_t kr; upl_t upl; - ipc_port_t previous; device_object = device_pager_lookup(device); if(device_object == DEVICE_PAGER_NULL) 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; @@ -226,15 +218,18 @@ device_pager_populate_object( return kr; if(!vm_object->phys_contiguous) { - int null_size = 0; + unsigned int null_size = 0; + assert((upl_size_t) size == size); kr = vm_object_upl_request(vm_object, - (vm_object_offset_t)offset, size, &upl, NULL, - &null_size, (UPL_NO_SYNC | UPL_CLEAN_IN_PLACE)); - + (vm_object_offset_t)offset, + (upl_size_t) size, &upl, NULL, + &null_size, + (UPL_NO_SYNC | UPL_CLEAN_IN_PLACE), + VM_KERN_MEMORY_NONE); if(kr != KERN_SUCCESS) panic("device_pager_populate_object: list_req failed"); - upl_commit(upl, NULL); + upl_commit(upl, NULL, 0); upl_deallocate(upl); } @@ -247,22 +242,24 @@ device_pager_populate_object( */ 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 == &device_pager_workaround); - 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; } /* * */ kern_return_t -device_pager_init(memory_object_t mem_obj, - memory_object_control_t control, - vm_size_t pg_size) +device_pager_init( + memory_object_t mem_obj, + memory_object_control_t control, + __unused memory_object_cluster_size_t pg_size) { device_pager_t device_object; kern_return_t kr; @@ -277,7 +274,7 @@ device_pager_init(memory_object_t mem_obj, 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 */ @@ -315,13 +312,17 @@ device_pager_init(memory_object_t mem_obj, /* * */ +/*ARGSUSED6*/ kern_return_t device_pager_data_return( - memory_object_t mem_obj, - memory_object_offset_t offset, - vm_size_t data_cnt, - boolean_t dirty, - boolean_t kernel_copy) + memory_object_t mem_obj, + memory_object_offset_t offset, + memory_object_cluster_size_t data_cnt, + __unused memory_object_offset_t *resid_offset, + __unused int *io_error, + __unused boolean_t dirty, + __unused boolean_t kernel_copy, + __unused int upl_flags) { device_pager_t device_object; @@ -329,8 +330,10 @@ device_pager_data_return( if (device_object == DEVICE_PAGER_NULL) panic("device_pager_data_return: lookup failed"); - return device_data_action(device_object->device_handle, device_object, - VM_PROT_READ | VM_PROT_WRITE, offset, data_cnt); + __IGNORE_WCASTALIGN(return device_data_action(device_object->device_handle, + (ipc_port_t) device_object, + VM_PROT_READ | VM_PROT_WRITE, + offset, data_cnt)); } /* @@ -340,8 +343,9 @@ kern_return_t device_pager_data_request( memory_object_t mem_obj, memory_object_offset_t offset, - vm_size_t length, - vm_prot_t protection_required) + memory_object_cluster_size_t length, + __unused vm_prot_t protection_required, + __unused memory_object_fault_info_t fault_info) { device_pager_t device_object; @@ -350,8 +354,9 @@ device_pager_data_request( if (device_object == DEVICE_PAGER_NULL) panic("device_pager_data_request: lookup failed"); - device_data_action(device_object->device_handle, device_object, - VM_PROT_READ, offset, length); + __IGNORE_WCASTALIGN(device_data_action(device_object->device_handle, + (ipc_port_t) device_object, + VM_PROT_READ, offset, length)); return KERN_SUCCESS; } @@ -368,6 +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); + DTRACE_VM2(device_pager_reference, + device_pager_t, device_object, + unsigned int, device_object->ref_count); + } /* @@ -377,40 +386,74 @@ void device_pager_deallocate( memory_object_t mem_obj) { - device_pager_t device_object; + 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. + */ - if (hw_atomic_sub(&device_object->ref_count, 1) == 0) { + 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; } - zfree(device_pager_zone, (vm_offset_t) device_object); + 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); } return; } kern_return_t device_pager_data_initialize( - memory_object_t mem_obj, - memory_object_offset_t offset, - vm_size_t data_cnt) + __unused memory_object_t mem_obj, + __unused memory_object_offset_t offset, + __unused memory_object_cluster_size_t data_cnt) { + panic("device_pager_data_initialize"); return KERN_FAILURE; } kern_return_t device_pager_data_unlock( - memory_object_t mem_obj, - memory_object_offset_t offset, - vm_size_t size, - vm_prot_t desired_access) + __unused memory_object_t mem_obj, + __unused memory_object_offset_t offset, + __unused memory_object_size_t size, + __unused vm_prot_t desired_access) { return KERN_FAILURE; } +kern_return_t device_pager_terminate( - memory_object_t mem_obj) + __unused memory_object_t mem_obj) { return KERN_SUCCESS; } @@ -422,28 +465,66 @@ device_pager_terminate( */ kern_return_t device_pager_synchronize( - memory_object_t mem_obj, - memory_object_offset_t offset, - vm_offset_t length, - vm_sync_t sync_flags) + __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; + panic("device_pager_synchronize: memory_object_synchronize no longer supported\n"); + return KERN_FAILURE; +} + +/* + * + */ +kern_return_t +device_pager_map( + memory_object_t mem_obj, + __unused vm_prot_t prot) +{ + device_pager_t device_object; device_object = device_pager_lookup(mem_obj); - memory_object_synchronize_completed( - device_object->control_handle, offset, length); + 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_unmap( +device_pager_last_unmap( 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; } @@ -453,19 +534,36 @@ device_pager_unmap( * */ device_pager_t -device_object_create() +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->pager = &device_pager_workaround; - 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); } +boolean_t +is_device_pager_ops(const struct memory_object_pager_ops *pager_ops) +{ + if (pager_ops == &device_pager_ops) { + return TRUE; + } + return FALSE; +}