[mirror_qemu.git] / plugins / plugin.h

/*
 * Plugin Shared Internal Functions
 *
 * Copyright (C) 2019, Linaro
 *
 * License: GNU GPL, version 2 or later.
 *   See the COPYING file in the top-level directory.
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

#ifndef _PLUGIN_INTERNAL_H_
#define _PLUGIN_INTERNAL_H_

#include <gmodule.h>

#define QEMU_PLUGIN_MIN_VERSION 0

/* global state */
struct qemu_plugin_state {
    QTAILQ_HEAD(, qemu_plugin_ctx) ctxs;
    QLIST_HEAD(, qemu_plugin_cb) cb_lists[QEMU_PLUGIN_EV_MAX];
    /*
     * Use the HT as a hash map by inserting k == v, which saves memory as
     * documented by GLib. The parent struct is obtained with container_of().
     */
    GHashTable *id_ht;
    /*
     * Use the HT as a hash map. Note that we could use a list here,
     * but with the HT we avoid adding a field to CPUState.
     */
    GHashTable *cpu_ht;
    DECLARE_BITMAP(mask, QEMU_PLUGIN_EV_MAX);
    /*
     * @lock protects the struct as well as ctx->uninstalling.
     * The lock must be acquired by all API ops.
     * The lock is recursive, which greatly simplifies things, e.g.
     * callback registration from qemu_plugin_vcpu_for_each().
     */
    QemuRecMutex lock;
    /*
     * HT of callbacks invoked from helpers. All entries are freed when
     * the code cache is flushed.
     */
    struct qht dyn_cb_arr_ht;
};


struct qemu_plugin_ctx {
    GModule *handle;
    qemu_plugin_id_t id;
    struct qemu_plugin_cb *callbacks[QEMU_PLUGIN_EV_MAX];
    QTAILQ_ENTRY(qemu_plugin_ctx) entry;
    /*
     * keep a reference to @desc until uninstall, so that plugins do not have
     * to strdup plugin args.
     */
    struct qemu_plugin_desc *desc;
    bool installing;
    bool uninstalling;
    bool resetting;
};

struct qemu_plugin_ctx *plugin_id_to_ctx_locked(qemu_plugin_id_t id);

void plugin_register_inline_op(GArray **arr,
                               enum qemu_plugin_mem_rw rw,
                               enum qemu_plugin_op op, void *ptr,
                               uint64_t imm);

void plugin_reset_uninstall(qemu_plugin_id_t id,
                            qemu_plugin_simple_cb_t cb,
                            bool reset);

void plugin_register_cb(qemu_plugin_id_t id, enum qemu_plugin_event ev,
                        void *func);

void plugin_unregister_cb__locked(struct qemu_plugin_ctx *ctx,
                                  enum qemu_plugin_event ev);

void
plugin_register_cb_udata(qemu_plugin_id_t id, enum qemu_plugin_event ev,
                         void *func, void *udata);

void
plugin_register_dyn_cb__udata(GArray **arr,
                              qemu_plugin_vcpu_udata_cb_t cb,
                              enum qemu_plugin_cb_flags flags, void *udata);


void plugin_register_vcpu_mem_cb(GArray **arr,
                                 void *cb,
                                 enum qemu_plugin_cb_flags flags,
                                 enum qemu_plugin_mem_rw rw,
                                 void *udata);

void exec_inline_op(struct qemu_plugin_dyn_cb *cb);

#endif /* _PLUGIN_INTERNAL_H_ */
Commit	Line	Data
54cb65d8 EC	1	/*
	2	* Plugin Shared Internal Functions
	3	*
	4	* Copyright (C) 2019, Linaro
	5	*
	6	* License: GNU GPL, version 2 or later.
	7	* See the COPYING file in the top-level directory.
	8	*
	9	* SPDX-License-Identifier: GPL-2.0-or-later
	10	*/
	11
	12	#ifndef _PLUGIN_INTERNAL_H_
	13	#define _PLUGIN_INTERNAL_H_
	14
	15	#include <gmodule.h>
	16
3fb356cc AB	17	#define QEMU_PLUGIN_MIN_VERSION 0
3fb356cc AB	18
54cb65d8 EC	19	/* global state */
	20	struct qemu_plugin_state {
	21	QTAILQ_HEAD(, qemu_plugin_ctx) ctxs;
	22	QLIST_HEAD(, qemu_plugin_cb) cb_lists[QEMU_PLUGIN_EV_MAX];
	23	/*
	24	* Use the HT as a hash map by inserting k == v, which saves memory as
	25	* documented by GLib. The parent struct is obtained with container_of().
	26	*/
	27	GHashTable *id_ht;
	28	/*
	29	* Use the HT as a hash map. Note that we could use a list here,
	30	* but with the HT we avoid adding a field to CPUState.
	31	*/
	32	GHashTable *cpu_ht;
	33	DECLARE_BITMAP(mask, QEMU_PLUGIN_EV_MAX);
	34	/*
	35	* @lock protects the struct as well as ctx->uninstalling.
	36	* The lock must be acquired by all API ops.
	37	* The lock is recursive, which greatly simplifies things, e.g.
	38	* callback registration from qemu_plugin_vcpu_for_each().
	39	*/
	40	QemuRecMutex lock;
	41	/*
	42	* HT of callbacks invoked from helpers. All entries are freed when
	43	* the code cache is flushed.
	44	*/
	45	struct qht dyn_cb_arr_ht;
	46	};
	47
	48
	49	struct qemu_plugin_ctx {
	50	GModule *handle;
	51	qemu_plugin_id_t id;
	52	struct qemu_plugin_cb *callbacks[QEMU_PLUGIN_EV_MAX];
	53	QTAILQ_ENTRY(qemu_plugin_ctx) entry;
	54	/*
	55	* keep a reference to @desc until uninstall, so that plugins do not have
	56	* to strdup plugin args.
	57	*/
	58	struct qemu_plugin_desc *desc;
	59	bool installing;
	60	bool uninstalling;
	61	bool resetting;
	62	};
	63
	64	struct qemu_plugin_ctx *plugin_id_to_ctx_locked(qemu_plugin_id_t id);
	65
	66	void plugin_register_inline_op(GArray **arr,
	67	enum qemu_plugin_mem_rw rw,
	68	enum qemu_plugin_op op, void *ptr,
	69	uint64_t imm);
	70
	71	void plugin_reset_uninstall(qemu_plugin_id_t id,
	72	qemu_plugin_simple_cb_t cb,
	73	bool reset);
	74
	75	void plugin_register_cb(qemu_plugin_id_t id, enum qemu_plugin_event ev,
	76	void *func);
	77
	78	void plugin_unregister_cb__locked(struct qemu_plugin_ctx *ctx,
	79	enum qemu_plugin_event ev);
	80
	81	void
	82	plugin_register_cb_udata(qemu_plugin_id_t id, enum qemu_plugin_event ev,
83	void func, void udata);
84
85	void
86	plugin_register_dyn_cb__udata(GArray **arr,
87	qemu_plugin_vcpu_udata_cb_t cb,
88	enum qemu_plugin_cb_flags flags, void *udata);
89
90
91	void plugin_register_vcpu_mem_cb(GArray **arr,
92	void *cb,
93	enum qemu_plugin_cb_flags flags,
94	enum qemu_plugin_mem_rw rw,
95	void *udata);
96
97	void exec_inline_op(struct qemu_plugin_dyn_cb *cb);
98
99	#endif /* _PLUGIN_INTERNAL_H_ */