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_H 13 #define PLUGIN_H 14 15 #include <gmodule.h> 16 #include "qemu/qht.h" 17 18 #define QEMU_PLUGIN_MIN_VERSION 2 19 20 /* global state */ 21 struct qemu_plugin_state { 22 QTAILQ_HEAD(, qemu_plugin_ctx) ctxs; 23 QLIST_HEAD(, qemu_plugin_cb) cb_lists[QEMU_PLUGIN_EV_MAX]; 24 /* 25 * Use the HT as a hash map by inserting k == v, which saves memory as 26 * documented by GLib. The parent struct is obtained with container_of(). 27 */ 28 GHashTable *id_ht; 29 /* 30 * Use the HT as a hash map. Note that we could use a list here, 31 * but with the HT we avoid adding a field to CPUState. 32 */ 33 GHashTable *cpu_ht; 34 QLIST_HEAD(, qemu_plugin_scoreboard) scoreboards; 35 size_t scoreboard_alloc_size; 36 DECLARE_BITMAP(mask, QEMU_PLUGIN_EV_MAX); 37 /* 38 * @lock protects the struct as well as ctx->uninstalling. 39 * The lock must be acquired by all API ops. 40 * The lock is recursive, which greatly simplifies things, e.g. 41 * callback registration from qemu_plugin_vcpu_for_each(). 42 */ 43 QemuRecMutex lock; 44 /* 45 * HT of callbacks invoked from helpers. All entries are freed when 46 * the code cache is flushed. 47 */ 48 struct qht dyn_cb_arr_ht; 49 /* How many vcpus were started */ 50 int num_vcpus; 51 }; 52 53 54 struct qemu_plugin_ctx { 55 GModule *handle; 56 qemu_plugin_id_t id; 57 struct qemu_plugin_cb *callbacks[QEMU_PLUGIN_EV_MAX]; 58 QTAILQ_ENTRY(qemu_plugin_ctx) entry; 59 /* 60 * keep a reference to @desc until uninstall, so that plugins do not have 61 * to strdup plugin args. 62 */ 63 struct qemu_plugin_desc *desc; 64 bool installing; 65 bool uninstalling; 66 bool resetting; 67 }; 68 69 struct qemu_plugin_ctx *plugin_id_to_ctx_locked(qemu_plugin_id_t id); 70 71 void plugin_register_inline_op_on_entry(GArray **arr, 72 enum qemu_plugin_mem_rw rw, 73 enum qemu_plugin_op op, 74 qemu_plugin_u64 entry, 75 uint64_t imm); 76 77 void plugin_reset_uninstall(qemu_plugin_id_t id, 78 qemu_plugin_simple_cb_t cb, 79 bool reset); 80 81 void plugin_register_cb(qemu_plugin_id_t id, enum qemu_plugin_event ev, 82 void *func); 83 84 void plugin_unregister_cb__locked(struct qemu_plugin_ctx *ctx, 85 enum qemu_plugin_event ev); 86 87 void 88 plugin_register_cb_udata(qemu_plugin_id_t id, enum qemu_plugin_event ev, 89 void *func, void *udata); 90 91 void 92 plugin_register_dyn_cb__udata(GArray **arr, 93 qemu_plugin_vcpu_udata_cb_t cb, 94 enum qemu_plugin_cb_flags flags, void *udata); 95 96 97 void plugin_register_vcpu_mem_cb(GArray **arr, 98 void *cb, 99 enum qemu_plugin_cb_flags flags, 100 enum qemu_plugin_mem_rw rw, 101 void *udata); 102 103 void exec_inline_op(struct qemu_plugin_dyn_cb *cb, int cpu_index); 104 105 int plugin_num_vcpus(void); 106 107 struct qemu_plugin_scoreboard *plugin_scoreboard_new(size_t element_size); 108 109 void plugin_scoreboard_free(struct qemu_plugin_scoreboard *score); 110 111 #endif /* PLUGIN_H */ 112