plugins/plugin.h

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