/* SPDX-License-Identifier: (GPL-2.0 OR CDDL-1.0) */ /* * vboxguest vmm-req and hgcm-call code, VBoxGuestR0LibHGCMInternal.cpp, * VBoxGuestR0LibGenericRequest.cpp and RTErrConvertToErrno.cpp in vbox svn. * * Copyright (C) 2006-2016 Oracle Corporation */ #include <linux/errno.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/mm.h> #include <linux/module.h> #include <linux/sizes.h> #include <linux/slab.h> #include <linux/uaccess.h> #include <linux/vmalloc.h> #include <linux/vbox_err.h> #include <linux/vbox_utils.h> #include "vboxguest_core.h" /* Get the pointer to the first parameter of a HGCM call request. */ #define VMMDEV_HGCM_CALL_PARMS(a) … /* The max parameter buffer size for a user request. */ #define VBG_MAX_HGCM_USER_PARM … /* The max parameter buffer size for a kernel request. */ #define VBG_MAX_HGCM_KERNEL_PARM … #define VBG_DEBUG_PORT … /* This protects vbg_log_buf and serializes VBG_DEBUG_PORT accesses */ static DEFINE_SPINLOCK(vbg_log_lock); static char vbg_log_buf[128]; #define VBG_LOG(name, pr_func) … VBG_LOG(vbg_info, pr_info); VBG_LOG(vbg_warn, pr_warn); VBG_LOG(vbg_err, pr_err); VBG_LOG(vbg_err_ratelimited, pr_err_ratelimited); #if defined(DEBUG) && !defined(CONFIG_DYNAMIC_DEBUG) VBG_LOG(vbg_debug, pr_debug); #endif void *vbg_req_alloc(size_t len, enum vmmdev_request_type req_type, u32 requestor) { … } void vbg_req_free(void *req, size_t len) { … } /* Note this function returns a VBox status code, not a negative errno!! */ int vbg_req_perform(struct vbg_dev *gdev, void *req) { … } static bool hgcm_req_done(struct vbg_dev *gdev, struct vmmdev_hgcmreq_header *header) { … } int vbg_hgcm_connect(struct vbg_dev *gdev, u32 requestor, struct vmmdev_hgcm_service_location *loc, u32 *client_id, int *vbox_status) { … } EXPORT_SYMBOL(…); int vbg_hgcm_disconnect(struct vbg_dev *gdev, u32 requestor, u32 client_id, int *vbox_status) { … } EXPORT_SYMBOL(…); static u32 hgcm_call_buf_size_in_pages(void *buf, u32 len) { … } static void hgcm_call_add_pagelist_size(void *buf, u32 len, size_t *extra) { … } static int hgcm_call_preprocess_linaddr( const struct vmmdev_hgcm_function_parameter *src_parm, void **bounce_buf_ret, size_t *extra) { … } /** * hgcm_call_preprocess - Preprocesses the HGCM call, validate parameters, * alloc bounce buffers and figure out how much extra storage we need for * page lists. * @src_parm: Pointer to source function call parameters * @parm_count: Number of function call parameters. * @bounce_bufs_ret: Where to return the allocated bouncebuffer array * @extra: Where to return the extra request space needed for * physical page lists. * * Return: %0 or negative errno value. */ static int hgcm_call_preprocess( const struct vmmdev_hgcm_function_parameter *src_parm, u32 parm_count, void ***bounce_bufs_ret, size_t *extra) { … } /** * hgcm_call_linear_addr_type_to_pagelist_flags - Translates linear address * types to page list direction flags. * @type: The type. * * Return: page list flags. */ static u32 hgcm_call_linear_addr_type_to_pagelist_flags( enum vmmdev_hgcm_function_parameter_type type) { … } static void hgcm_call_init_linaddr(struct vmmdev_hgcm_call *call, struct vmmdev_hgcm_function_parameter *dst_parm, void *buf, u32 len, enum vmmdev_hgcm_function_parameter_type type, u32 *off_extra) { … } /** * hgcm_call_init_call - Initializes the call request that we're sending * to the host. * @call: The call to initialize. * @client_id: The client ID of the caller. * @function: The function number of the function to call. * @src_parm: Pointer to source function call parameters. * @parm_count: Number of function call parameters. * @bounce_bufs: The bouncebuffer array. */ static void hgcm_call_init_call( struct vmmdev_hgcm_call *call, u32 client_id, u32 function, const struct vmmdev_hgcm_function_parameter *src_parm, u32 parm_count, void **bounce_bufs) { … } /** * hgcm_cancel_call - Tries to cancel a pending HGCM call. * @gdev: The VBoxGuest device extension. * @call: The call to cancel. * * Return: VBox status code */ static int hgcm_cancel_call(struct vbg_dev *gdev, struct vmmdev_hgcm_call *call) { … } /** * vbg_hgcm_do_call - Performs the call and completion wait. * @gdev: The VBoxGuest device extension. * @call: The call to execute. * @timeout_ms: Timeout in ms. * @interruptible: whether this call is interruptible * @leak_it: Where to return the leak it / free it, indicator. * Cancellation fun. * * Return: %0 or negative errno value. */ static int vbg_hgcm_do_call(struct vbg_dev *gdev, struct vmmdev_hgcm_call *call, u32 timeout_ms, bool interruptible, bool *leak_it) { … } /** * hgcm_call_copy_back_result - Copies the result of the call back to * the caller info structure and user buffers. * @call: HGCM call request. * @dst_parm: Pointer to function call parameters destination. * @parm_count: Number of function call parameters. * @bounce_bufs: The bouncebuffer array. * * Return: %0 or negative errno value. */ static int hgcm_call_copy_back_result( const struct vmmdev_hgcm_call *call, struct vmmdev_hgcm_function_parameter *dst_parm, u32 parm_count, void **bounce_bufs) { … } int vbg_hgcm_call(struct vbg_dev *gdev, u32 requestor, u32 client_id, u32 function, u32 timeout_ms, struct vmmdev_hgcm_function_parameter *parms, u32 parm_count, int *vbox_status) { … } EXPORT_SYMBOL(…); #ifdef CONFIG_COMPAT int vbg_hgcm_call32( struct vbg_dev *gdev, u32 requestor, u32 client_id, u32 function, u32 timeout_ms, struct vmmdev_hgcm_function_parameter32 *parm32, u32 parm_count, int *vbox_status) { … } #endif static const int vbg_status_code_to_errno_table[] = …; int vbg_status_code_to_errno(int rc) { … } EXPORT_SYMBOL(…);
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