include/xen/grant_table.h - kernel/msm-4.19 - Gitiles

 /******************************************************************************
  * grant_table.h
  *
  * Two sets of functionality:
  * 1. Granting foreign access to our memory reservation.
  * 2. Accessing others' memory reservations via grant references.
  * (i.e., mechanisms for both sender and recipient of grant references)
  *
  * Copyright (c) 2004-2005, K A Fraser
  * Copyright (c) 2005, Christopher Clark
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License version 2
  * as published by the Free Software Foundation; or, when distributed
  * separately from the Linux kernel or incorporated into other
  * software packages, subject to the following license:
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this source file (the "Software"), to deal in the Software without
  * restriction, including without limitation the rights to use, copy, modify,
  * merge, publish, distribute, sublicense, and/or sell copies of the Software,
  * and to permit persons to whom the Software is furnished to do so, subject to
  * the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  * IN THE SOFTWARE.
  */

 #ifndef __ASM_GNTTAB_H__
 #define __ASM_GNTTAB_H__

 #include <asm/page.h>

 #include <xen/interface/xen.h>
 #include <xen/interface/grant_table.h>

 #include <asm/xen/hypervisor.h>

 #include <xen/features.h>

 #define GNTTAB_RESERVED_XENSTORE 1

 /* NR_GRANT_FRAMES must be less than or equal to that configured in Xen */
 #define NR_GRANT_FRAMES 4

 struct gnttab_free_callback {
 	struct gnttab_free_callback *next;
 	void (*fn)(void *);
 	void *arg;
 	u16 count;
 };

 int gnttab_init(void);
 int gnttab_suspend(void);
 int gnttab_resume(void);

 int gnttab_grant_foreign_access(domid_t domid, unsigned long frame,
 				int readonly);
 int gnttab_grant_foreign_access_subpage(domid_t domid, unsigned long frame,
 					int flags, unsigned page_off,
 					unsigned length);
 int gnttab_grant_foreign_access_trans(domid_t domid, int flags,
 				      domid_t trans_domid,
 				      grant_ref_t trans_gref);

 /*
  * Are sub-page grants available on this version of Xen?  Returns true if they
  * are, and false if they're not.
  */
 bool gnttab_subpage_grants_available(void);

 /*
  * Are transitive grants available on this version of Xen?  Returns true if they
  * are, and false if they're not.
  */
 bool gnttab_trans_grants_available(void);

 /*
  * End access through the given grant reference, iff the grant entry is no
  * longer in use.  Return 1 if the grant entry was freed, 0 if it is still in
  * use.
  */
 int gnttab_end_foreign_access_ref(grant_ref_t ref, int readonly);

 /*
  * Eventually end access through the given grant reference, and once that
  * access has been ended, free the given page too.  Access will be ended
  * immediately iff the grant entry is not in use, otherwise it will happen
  * some time later.  page may be 0, in which case no freeing will occur.
  */
 void gnttab_end_foreign_access(grant_ref_t ref, int readonly,
 			       unsigned long page);

 int gnttab_grant_foreign_transfer(domid_t domid, unsigned long pfn);

 unsigned long gnttab_end_foreign_transfer_ref(grant_ref_t ref);
 unsigned long gnttab_end_foreign_transfer(grant_ref_t ref);

 int gnttab_query_foreign_access(grant_ref_t ref);

 /*
  * operations on reserved batches of grant references
  */
 int gnttab_alloc_grant_references(u16 count, grant_ref_t *pprivate_head);

 void gnttab_free_grant_reference(grant_ref_t ref);

 void gnttab_free_grant_references(grant_ref_t head);

 int gnttab_empty_grant_references(const grant_ref_t *pprivate_head);

 int gnttab_claim_grant_reference(grant_ref_t *pprivate_head);

 void gnttab_release_grant_reference(grant_ref_t *private_head,
 				    grant_ref_t release);

 void gnttab_request_free_callback(struct gnttab_free_callback *callback,
 				  void (*fn)(void *), void *arg, u16 count);
 void gnttab_cancel_free_callback(struct gnttab_free_callback *callback);

 void gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid,
 				     unsigned long frame, int readonly);
 int gnttab_grant_foreign_access_subpage_ref(grant_ref_t ref, domid_t domid,
 					    unsigned long frame, int flags,
 					    unsigned page_off,
 					    unsigned length);
 int gnttab_grant_foreign_access_trans_ref(grant_ref_t ref, domid_t domid,
 					  int flags, domid_t trans_domid,
 					  grant_ref_t trans_gref);

 void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid,
 				       unsigned long pfn);

 static inline void
 gnttab_set_map_op(struct gnttab_map_grant_ref *map, phys_addr_t addr,
 		  uint32_t flags, grant_ref_t ref, domid_t domid)
 {
 	if (flags & GNTMAP_contains_pte)
 		map->host_addr = addr;
 	else if (xen_feature(XENFEAT_auto_translated_physmap))
 		map->host_addr = __pa(addr);
 	else
 		map->host_addr = addr;

 	map->flags = flags;
 	map->ref = ref;
 	map->dom = domid;
 }

 static inline void
 gnttab_set_unmap_op(struct gnttab_unmap_grant_ref *unmap, phys_addr_t addr,
 		    uint32_t flags, grant_handle_t handle)
 {
 	if (flags & GNTMAP_contains_pte)
 		unmap->host_addr = addr;
 	else if (xen_feature(XENFEAT_auto_translated_physmap))
 		unmap->host_addr = __pa(addr);
 	else
 		unmap->host_addr = addr;

 	unmap->handle = handle;
 	unmap->dev_bus_addr = 0;
 }

 int arch_gnttab_map_shared(xen_pfn_t *frames, unsigned long nr_gframes,
 			   unsigned long max_nr_gframes,
 			   void **__shared);
 int arch_gnttab_map_status(uint64_t *frames, unsigned long nr_gframes,
 			   unsigned long max_nr_gframes,
 			   grant_status_t **__shared);
 void arch_gnttab_unmap(void *shared, unsigned long nr_gframes);

 struct grant_frames {
 	xen_pfn_t *pfn;
 	unsigned int count;
 	void *vaddr;
 };
 extern struct grant_frames xen_auto_xlat_grant_frames;
 unsigned int gnttab_max_grant_frames(void);
 int gnttab_setup_auto_xlat_frames(phys_addr_t addr);
 void gnttab_free_auto_xlat_frames(void);

 #define gnttab_map_vaddr(map) ((void *)(map.host_virt_addr))

 int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops,
 		    struct page **pages, unsigned int count);
 int gnttab_map_refs_userspace(struct gnttab_map_grant_ref *map_ops,
 			      struct gnttab_map_grant_ref *kmap_ops,
 			      struct page **pages, unsigned int count);
 int gnttab_unmap_refs(struct gnttab_unmap_grant_ref *unmap_ops,
 		      struct page **pages, unsigned int count);
 int gnttab_unmap_refs_userspace(struct gnttab_unmap_grant_ref *unmap_ops,
 				struct gnttab_map_grant_ref *kunmap_ops,
 				struct page **pages, unsigned int count);

 /* Perform a batch of grant map/copy operations. Retry every batch slot
  * for which the hypervisor returns GNTST_eagain. This is typically due
  * to paged out target frames.
  *
  * Will retry for 1, 2, ... 255 ms, i.e. 256 times during 32 seconds.
  *
  * Return value in each iand every status field of the batch guaranteed
  * to not be GNTST_eagain.
  */
 void gnttab_batch_map(struct gnttab_map_grant_ref *batch, unsigned count);
 void gnttab_batch_copy(struct gnttab_copy *batch, unsigned count);

 #endif /* __ASM_GNTTAB_H__ */
	/******************************************************************************
	* grant_table.h
	*
	* Two sets of functionality:
	* 1. Granting foreign access to our memory reservation.
	* 2. Accessing others' memory reservations via grant references.
	* (i.e., mechanisms for both sender and recipient of grant references)
	*
	* Copyright (c) 2004-2005, K A Fraser
	* Copyright (c) 2005, Christopher Clark
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License version 2
	* as published by the Free Software Foundation; or, when distributed
	* separately from the Linux kernel or incorporated into other
	* software packages, subject to the following license:
	*
	* Permission is hereby granted, free of charge, to any person obtaining a copy
	* of this source file (the "Software"), to deal in the Software without
	* restriction, including without limitation the rights to use, copy, modify,
	* merge, publish, distribute, sublicense, and/or sell copies of the Software,
	* and to permit persons to whom the Software is furnished to do so, subject to
	* the following conditions:
	*
	* The above copyright notice and this permission notice shall be included in
	* all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
	* IN THE SOFTWARE.
	*/

	#ifndef __ASM_GNTTAB_H__
	#define __ASM_GNTTAB_H__

	#include <asm/page.h>

	#include <xen/interface/xen.h>
	#include <xen/interface/grant_table.h>

	#include <asm/xen/hypervisor.h>

	#include <xen/features.h>

	#define GNTTAB_RESERVED_XENSTORE 1

	/* NR_GRANT_FRAMES must be less than or equal to that configured in Xen */
	#define NR_GRANT_FRAMES 4

	struct gnttab_free_callback {
	struct gnttab_free_callback *next;
	void (fn)(void );
	void *arg;
	u16 count;
	};

	int gnttab_init(void);
	int gnttab_suspend(void);
	int gnttab_resume(void);

	int gnttab_grant_foreign_access(domid_t domid, unsigned long frame,
	int readonly);
	int gnttab_grant_foreign_access_subpage(domid_t domid, unsigned long frame,
	int flags, unsigned page_off,
	unsigned length);
	int gnttab_grant_foreign_access_trans(domid_t domid, int flags,
	domid_t trans_domid,
	grant_ref_t trans_gref);

	/*
	* Are sub-page grants available on this version of Xen? Returns true if they
	* are, and false if they're not.
	*/
	bool gnttab_subpage_grants_available(void);

	/*
	* Are transitive grants available on this version of Xen? Returns true if they
	* are, and false if they're not.
	*/
	bool gnttab_trans_grants_available(void);

	/*
	* End access through the given grant reference, iff the grant entry is no
	* longer in use. Return 1 if the grant entry was freed, 0 if it is still in
	* use.
	*/
	int gnttab_end_foreign_access_ref(grant_ref_t ref, int readonly);

	/*
	* Eventually end access through the given grant reference, and once that
	* access has been ended, free the given page too. Access will be ended
	* immediately iff the grant entry is not in use, otherwise it will happen
	* some time later. page may be 0, in which case no freeing will occur.
	*/
	void gnttab_end_foreign_access(grant_ref_t ref, int readonly,
	unsigned long page);

	int gnttab_grant_foreign_transfer(domid_t domid, unsigned long pfn);

	unsigned long gnttab_end_foreign_transfer_ref(grant_ref_t ref);
	unsigned long gnttab_end_foreign_transfer(grant_ref_t ref);

	int gnttab_query_foreign_access(grant_ref_t ref);

	/*
	* operations on reserved batches of grant references
	*/
	int gnttab_alloc_grant_references(u16 count, grant_ref_t *pprivate_head);

	void gnttab_free_grant_reference(grant_ref_t ref);

	void gnttab_free_grant_references(grant_ref_t head);

	int gnttab_empty_grant_references(const grant_ref_t *pprivate_head);

	int gnttab_claim_grant_reference(grant_ref_t *pprivate_head);

	void gnttab_release_grant_reference(grant_ref_t *private_head,
	grant_ref_t release);

	void gnttab_request_free_callback(struct gnttab_free_callback *callback,
	void (fn)(void ), void *arg, u16 count);
	void gnttab_cancel_free_callback(struct gnttab_free_callback *callback);

	void gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid,
	unsigned long frame, int readonly);
	int gnttab_grant_foreign_access_subpage_ref(grant_ref_t ref, domid_t domid,
	unsigned long frame, int flags,
	unsigned page_off,
	unsigned length);
	int gnttab_grant_foreign_access_trans_ref(grant_ref_t ref, domid_t domid,
	int flags, domid_t trans_domid,
	grant_ref_t trans_gref);

	void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid,
	unsigned long pfn);

	static inline void
	gnttab_set_map_op(struct gnttab_map_grant_ref *map, phys_addr_t addr,
	uint32_t flags, grant_ref_t ref, domid_t domid)
	{
	if (flags & GNTMAP_contains_pte)
	map->host_addr = addr;
	else if (xen_feature(XENFEAT_auto_translated_physmap))
	map->host_addr = __pa(addr);
	else
	map->host_addr = addr;

	map->flags = flags;
	map->ref = ref;
	map->dom = domid;
	}

	static inline void
	gnttab_set_unmap_op(struct gnttab_unmap_grant_ref *unmap, phys_addr_t addr,
	uint32_t flags, grant_handle_t handle)
	{
	if (flags & GNTMAP_contains_pte)
	unmap->host_addr = addr;
	else if (xen_feature(XENFEAT_auto_translated_physmap))
	unmap->host_addr = __pa(addr);
	else
	unmap->host_addr = addr;

	unmap->handle = handle;
	unmap->dev_bus_addr = 0;
	}

	int arch_gnttab_map_shared(xen_pfn_t *frames, unsigned long nr_gframes,
	unsigned long max_nr_gframes,
	void **__shared);
	int arch_gnttab_map_status(uint64_t *frames, unsigned long nr_gframes,
	unsigned long max_nr_gframes,
	grant_status_t **__shared);
	void arch_gnttab_unmap(void *shared, unsigned long nr_gframes);

	struct grant_frames {
	xen_pfn_t *pfn;
	unsigned int count;
	void *vaddr;
	};
	extern struct grant_frames xen_auto_xlat_grant_frames;
	unsigned int gnttab_max_grant_frames(void);
	int gnttab_setup_auto_xlat_frames(phys_addr_t addr);
	void gnttab_free_auto_xlat_frames(void);

	#define gnttab_map_vaddr(map) ((void *)(map.host_virt_addr))

	int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops,
	struct page **pages, unsigned int count);
	int gnttab_map_refs_userspace(struct gnttab_map_grant_ref *map_ops,
	struct gnttab_map_grant_ref *kmap_ops,
	struct page **pages, unsigned int count);
	int gnttab_unmap_refs(struct gnttab_unmap_grant_ref *unmap_ops,
	struct page **pages, unsigned int count);
	int gnttab_unmap_refs_userspace(struct gnttab_unmap_grant_ref *unmap_ops,
	struct gnttab_map_grant_ref *kunmap_ops,
	struct page **pages, unsigned int count);

	/* Perform a batch of grant map/copy operations. Retry every batch slot
	* for which the hypervisor returns GNTST_eagain. This is typically due
	* to paged out target frames.
	*
	* Will retry for 1, 2, ... 255 ms, i.e. 256 times during 32 seconds.
	*
	* Return value in each iand every status field of the batch guaranteed
	* to not be GNTST_eagain.
	*/
	void gnttab_batch_map(struct gnttab_map_grant_ref *batch, unsigned count);
	void gnttab_batch_copy(struct gnttab_copy *batch, unsigned count);

	#endif /* __ASM_GNTTAB_H__ */