ad088ae2c0
Adds the virtual services block protocol and block io drivers. This protocol and drivers support exporting virtual block devices from one VM to another, which are backed by another block device. Change-Id: I47f86307c6201cb66d81bd453bb8c6c7ce99480f Signed-off-by: Carl van Schaik <carl@cog.systems> Git-commit: 9e55989babab087627e1ae42b2ed8e656c4b3993 Git-repo: https://github.com/CogSystems/linux-msm/commits/msm-4.9-hyp Signed-off-by: Murali Nalajala <mnalajal@codeaurora.org>
178 lines
5.4 KiB
C
178 lines
5.4 KiB
C
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/*
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* Copyright (c) 2012-2018 General Dynamics
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* Copyright (c) 2014 Open Kernel Labs, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#if !defined(VSERVICES_SERVER_BLOCK)
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#define VSERVICES_SERVER_BLOCK
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struct vs_service_device;
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struct vs_server_block_state;
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struct vs_server_block {
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/*
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* If set to false then the receive message handlers are run from
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* workqueue context and are allowed to sleep. If set to true the
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* message handlers are run from tasklet context and may not sleep.
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*/
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bool rx_atomic;
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/*
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* If this is set to true along with rx_atomic, the driver is allowed
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* to send messages from softirq contexts other than the receive
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* message handlers, after calling vs_service_state_lock_bh. Otherwise,
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* messages may only be sent from the receive message handlers, or
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* from task context after calling vs_service_state_lock. This must
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* not be set to true if rx_atomic is set to false.
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*/
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bool tx_atomic;
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/*
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* These are the driver's recommended message quotas. They are used
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* by the core service to select message quotas for services with no
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* explicitly configured quotas.
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*/
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u32 in_quota_best;
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u32 out_quota_best;
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/** session setup **/
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struct vs_server_block_state *(*alloc) (struct vs_service_device *
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service);
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void (*release) (struct vs_server_block_state * _state);
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struct vs_service_driver *driver;
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/** Open, reopen, close and closed functions **/
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vs_server_response_type_t(*open) (struct vs_server_block_state *
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_state);
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vs_server_response_type_t(*reopen) (struct vs_server_block_state *
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_state);
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vs_server_response_type_t(*close) (struct vs_server_block_state *
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_state);
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void (*closed) (struct vs_server_block_state * _state);
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/** Send/receive state callbacks **/
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int (*tx_ready) (struct vs_server_block_state * _state);
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struct {
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int (*req_read) (struct vs_server_block_state * _state,
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uint32_t _opaque, uint64_t sector_index,
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uint32_t num_sects, bool nodelay, bool flush);
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int (*req_write) (struct vs_server_block_state * _state,
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uint32_t _opaque, uint64_t sector_index,
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uint32_t num_sects, bool nodelay, bool flush,
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bool commit, struct vs_pbuf data,
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struct vs_mbuf * _mbuf);
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} io;
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};
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struct vs_server_block_state {
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vservice_block_state_t state;
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bool readonly;
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uint32_t sector_size;
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uint32_t segment_size;
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uint64_t device_sectors;
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bool flushable;
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bool committable;
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struct {
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uint32_t sector_size;
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uint32_t segment_size;
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} io;
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struct vs_service_device *service;
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bool released;
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};
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/** Complete calls for server core functions **/
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extern int vs_server_block_open_complete(struct vs_server_block_state *_state,
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vs_server_response_type_t resp);
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extern int vs_server_block_close_complete(struct vs_server_block_state *_state,
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vs_server_response_type_t resp);
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extern int vs_server_block_reopen_complete(struct vs_server_block_state *_state,
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vs_server_response_type_t resp);
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/** interface block_io **/
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/* command parallel read */
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extern struct vs_mbuf *vs_server_block_io_alloc_ack_read(struct
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vs_server_block_state
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*_state,
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struct vs_pbuf *data,
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gfp_t flags);
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extern int vs_server_block_io_free_ack_read(struct vs_server_block_state
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*_state, struct vs_pbuf *data,
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struct vs_mbuf *_mbuf);
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extern int vs_server_block_io_send_ack_read(struct vs_server_block_state
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*_state, uint32_t _opaque,
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struct vs_pbuf data,
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struct vs_mbuf *_mbuf);
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extern int vs_server_block_io_send_nack_read(struct vs_server_block_state
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*_state, uint32_t _opaque,
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vservice_block_block_io_error_t
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err, gfp_t flags);
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/* command parallel write */
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extern int vs_server_block_io_getbufs_req_write(struct vs_server_block_state
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*_state, struct vs_pbuf *data,
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struct vs_mbuf *_mbuf);
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extern int vs_server_block_io_free_req_write(struct vs_server_block_state
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*_state, struct vs_pbuf *data,
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struct vs_mbuf *_mbuf);
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extern int vs_server_block_io_send_ack_write(struct vs_server_block_state
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*_state, uint32_t _opaque,
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gfp_t flags);
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extern int vs_server_block_io_send_nack_write(struct vs_server_block_state
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*_state, uint32_t _opaque,
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vservice_block_block_io_error_t
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err, gfp_t flags);
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static inline bool vs_server_block_io_send_ack_read_is_pending(struct
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vs_server_block_state
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*_state)
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{
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return !bitmap_empty(_state->state.io.read_bitmask,
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VSERVICE_BLOCK_IO_READ_MAX_PENDING);
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}
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static inline bool vs_server_block_io_send_ack_write_is_pending(struct
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vs_server_block_state
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*_state)
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{
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return !bitmap_empty(_state->state.io.write_bitmask,
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VSERVICE_BLOCK_IO_WRITE_MAX_PENDING);
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}
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/** Module registration **/
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struct module;
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extern int __vservice_block_server_register(struct vs_server_block *server,
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const char *name,
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struct module *owner);
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static inline int vservice_block_server_register(struct vs_server_block *server,
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const char *name)
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{
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#ifdef MODULE
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extern struct module __this_module;
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struct module *this_module = &__this_module;
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#else
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struct module *this_module = NULL;
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#endif
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return __vservice_block_server_register(server, name, this_module);
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}
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extern int vservice_block_server_unregister(struct vs_server_block *server);
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#endif /* ! VSERVICES_SERVER_BLOCK */
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