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Re: [Qemu-devel] [PATCH 08/42] tpm: remove TPMDriverOps


From: Stefan Berger
Subject: Re: [Qemu-devel] [PATCH 08/42] tpm: remove TPMDriverOps
Date: Thu, 19 Oct 2017 10:43:39 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0

On 10/09/2017 06:55 PM, Marc-André Lureau wrote:
Use TPMBackendClass to hold class methods/fields.

Signed-off-by: Marc-André Lureau <address@hidden>

Reviewed-by: Stefan Berger <address@hidden>

---
  include/sysemu/tpm_backend.h | 15 +++++----------
  backends/tpm.c               | 31 ++++++++++++++++---------------
  hw/tpm/tpm_emulator.c        | 29 ++++++++++++-----------------
  hw/tpm/tpm_passthrough.c     | 25 +++++++++++--------------
  tpm.c                        | 20 +++++++++-----------
  scripts/checkpatch.pl        |  1 -
  6 files changed, 53 insertions(+), 68 deletions(-)

diff --git a/include/sysemu/tpm_backend.h b/include/sysemu/tpm_backend.h
index 63093551a1..a4288df038 100644
--- a/include/sysemu/tpm_backend.h
+++ b/include/sysemu/tpm_backend.h
@@ -29,7 +29,7 @@

  typedef struct TPMBackendClass TPMBackendClass;
  typedef struct TPMBackend TPMBackend;
-typedef struct TPMDriverOps TPMDriverOps;
+
  typedef void (TPMRecvDataCB)(TPMState *, uint8_t locty, bool selftest_done);

  typedef enum TPMBackendCmd {
@@ -59,14 +59,6 @@ struct TPMBackend {
  struct TPMBackendClass {
      ObjectClass parent_class;

-    const TPMDriverOps *ops;
-
-    void (*opened)(TPMBackend *s, Error **errp);
-
-    void (*handle_request)(TPMBackend *s, TPMBackendCmd cmd);
-};
-
-struct TPMDriverOps {
      enum TpmType type;
      const QemuOptDesc *opts;
      /* get a descriptive text of the backend to display to the user */
@@ -90,8 +82,11 @@ struct TPMDriverOps {
      TPMVersion (*get_tpm_version)(TPMBackend *t);

      TpmTypeOptions *(*get_tpm_options)(TPMBackend *t);
-};

+    void (*opened)(TPMBackend *s, Error **errp);
+
+    void (*handle_request)(TPMBackend *s, TPMBackendCmd cmd);
+};

  /**
   * tpm_backend_get_type:
diff --git a/backends/tpm.c b/backends/tpm.c
index 37c84b7c66..ca3a78eea8 100644
--- a/backends/tpm.c
+++ b/backends/tpm.c
@@ -41,7 +41,7 @@ enum TpmType tpm_backend_get_type(TPMBackend *s)
  {
      TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);

-    return k->ops->type;
+    return k->type;
  }

  int tpm_backend_init(TPMBackend *s, TPMState *state,
@@ -53,7 +53,7 @@ int tpm_backend_init(TPMBackend *s, TPMState *state,
      s->recv_data_callback = datacb;
      s->had_startup_error = false;

-    return k->ops->init ? k->ops->init(s) : 0;
+    return k->init ? k->init(s) : 0;
  }

  int tpm_backend_startup_tpm(TPMBackend *s)
@@ -68,7 +68,7 @@ int tpm_backend_startup_tpm(TPMBackend *s)
                                         NULL);
      g_thread_pool_push(s->thread_pool, (gpointer)TPM_BACKEND_CMD_INIT, NULL);

-    res = k->ops->startup_tpm ? k->ops->startup_tpm(s) : 0;
+    res = k->startup_tpm ? k->startup_tpm(s) : 0;

      s->had_startup_error = (res != 0);

@@ -90,8 +90,8 @@ void tpm_backend_reset(TPMBackend *s)
  {
      TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);

-    if (k->ops->reset) {
-        k->ops->reset(s);
+    if (k->reset) {
+        k->reset(s);
      }

      tpm_backend_thread_end(s);
@@ -103,34 +103,34 @@ void tpm_backend_cancel_cmd(TPMBackend *s)
  {
      TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);

-    assert(k->ops->cancel_cmd);
+    assert(k->cancel_cmd);

-    k->ops->cancel_cmd(s);
+    k->cancel_cmd(s);
  }

  bool tpm_backend_get_tpm_established_flag(TPMBackend *s)
  {
      TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);

-    return k->ops->get_tpm_established_flag ?
-           k->ops->get_tpm_established_flag(s) : false;
+    return k->get_tpm_established_flag ?
+           k->get_tpm_established_flag(s) : false;
  }

  int tpm_backend_reset_tpm_established_flag(TPMBackend *s, uint8_t locty)
  {
      TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);

-    return k->ops->reset_tpm_established_flag ?
-           k->ops->reset_tpm_established_flag(s, locty) : 0;
+    return k->reset_tpm_established_flag ?
+           k->reset_tpm_established_flag(s, locty) : 0;
  }

  TPMVersion tpm_backend_get_tpm_version(TPMBackend *s)
  {
      TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);

-    assert(k->ops->get_tpm_version);
+    assert(k->get_tpm_version);

-    return k->ops->get_tpm_version(s);
+    return k->get_tpm_version(s);
  }

  TPMInfo *tpm_backend_query_tpm(TPMBackend *s)
@@ -140,8 +140,9 @@ TPMInfo *tpm_backend_query_tpm(TPMBackend *s)

      info->id = g_strdup(s->id);
      info->model = s->fe_model;
-    info->options = k->ops->get_tpm_options ?
-                    k->ops->get_tpm_options(s) : NULL;
+    if (k->get_tpm_options) {
+        info->options = k->get_tpm_options(s);
+    }

      return info;
  }
diff --git a/hw/tpm/tpm_emulator.c b/hw/tpm/tpm_emulator.c
index 9e24a5f30e..bb5a65b492 100644
--- a/hw/tpm/tpm_emulator.c
+++ b/hw/tpm/tpm_emulator.c
@@ -60,8 +60,6 @@

  #define TPM_EMULATOR_IMPLEMENTS_ALL_CAPS(S, cap) (((S)->caps & (cap)) == 
(cap))

-static const TPMDriverOps tpm_emulator_driver;
-
  /* data structures */
  typedef struct TPMEmulator {
      TPMBackend parent;
@@ -504,20 +502,6 @@ static const QemuOptDesc tpm_emulator_cmdline_opts[] = {
      { /* end of list */ },
  };

-static const TPMDriverOps tpm_emulator_driver = {
-    .type                     = TPM_TYPE_EMULATOR,
-    .opts                     = tpm_emulator_cmdline_opts,
-    .desc                     = "TPM emulator backend driver",
-
-    .create                   = tpm_emulator_create,
-    .startup_tpm              = tpm_emulator_startup_tpm,
-    .cancel_cmd               = tpm_emulator_cancel_cmd,
-    .get_tpm_established_flag = tpm_emulator_get_tpm_established_flag,
-    .reset_tpm_established_flag = tpm_emulator_reset_tpm_established_flag,
-    .get_tpm_version          = tpm_emulator_get_tpm_version,
-    .get_tpm_options          = tpm_emulator_get_tpm_options,
-};
-
  static void tpm_emulator_inst_init(Object *obj)
  {
      TPMEmulator *tpm_emu = TPM_EMULATOR(obj);
@@ -565,7 +549,18 @@ static void tpm_emulator_inst_finalize(Object *obj)
  static void tpm_emulator_class_init(ObjectClass *klass, void *data)
  {
      TPMBackendClass *tbc = TPM_BACKEND_CLASS(klass);
-    tbc->ops = &tpm_emulator_driver;
+
+    tbc->type = TPM_TYPE_EMULATOR;
+    tbc->opts = tpm_emulator_cmdline_opts;
+    tbc->desc = "TPM emulator backend driver";
+    tbc->create = tpm_emulator_create;
+    tbc->startup_tpm = tpm_emulator_startup_tpm;
+    tbc->cancel_cmd = tpm_emulator_cancel_cmd;
+    tbc->get_tpm_established_flag = tpm_emulator_get_tpm_established_flag;
+    tbc->reset_tpm_established_flag = tpm_emulator_reset_tpm_established_flag;
+    tbc->get_tpm_version = tpm_emulator_get_tpm_version;
+    tbc->get_tpm_options = tpm_emulator_get_tpm_options;
+
      tbc->handle_request = tpm_emulator_handle_request;
  }

diff --git a/hw/tpm/tpm_passthrough.c b/hw/tpm/tpm_passthrough.c
index f04eab3e63..d9da99bc8e 100644
--- a/hw/tpm/tpm_passthrough.c
+++ b/hw/tpm/tpm_passthrough.c
@@ -365,19 +365,6 @@ static const QemuOptDesc tpm_passthrough_cmdline_opts[] = {
      { /* end of list */ },
  };

-static const TPMDriverOps tpm_passthrough_driver = {
-    .type                     = TPM_TYPE_PASSTHROUGH,
-    .opts                     = tpm_passthrough_cmdline_opts,
-    .desc                     = "Passthrough TPM backend driver",
-    .create                   = tpm_passthrough_create,
-    .reset                    = tpm_passthrough_reset,
-    .cancel_cmd               = tpm_passthrough_cancel_cmd,
-    .get_tpm_established_flag = tpm_passthrough_get_tpm_established_flag,
-    .reset_tpm_established_flag = tpm_passthrough_reset_tpm_established_flag,
-    .get_tpm_version          = tpm_passthrough_get_tpm_version,
-    .get_tpm_options          = tpm_passthrough_get_tpm_options,
-};
-
  static void tpm_passthrough_inst_init(Object *obj)
  {
      TPMPassthruState *tpm_pt = TPM_PASSTHROUGH(obj);
@@ -402,7 +389,17 @@ static void tpm_passthrough_class_init(ObjectClass *klass, 
void *data)
  {
      TPMBackendClass *tbc = TPM_BACKEND_CLASS(klass);

-    tbc->ops = &tpm_passthrough_driver;
+    tbc->type = TPM_TYPE_PASSTHROUGH;
+    tbc->opts = tpm_passthrough_cmdline_opts;
+    tbc->desc = "Passthrough TPM backend driver";
+    tbc->create = tpm_passthrough_create;
+    tbc->reset = tpm_passthrough_reset;
+    tbc->cancel_cmd = tpm_passthrough_cancel_cmd;
+    tbc->get_tpm_established_flag = tpm_passthrough_get_tpm_established_flag;
+    tbc->reset_tpm_established_flag =
+        tpm_passthrough_reset_tpm_established_flag;
+    tbc->get_tpm_version = tpm_passthrough_get_tpm_version;
+    tbc->get_tpm_options = tpm_passthrough_get_tpm_options;
      tbc->handle_request = tpm_passthrough_handle_request;
  }

diff --git a/tpm.c b/tpm.c
index 75a589b837..4882501bd7 100644
--- a/tpm.c
+++ b/tpm.c
@@ -32,11 +32,10 @@ void tpm_register_model(enum TpmModel model)

  #ifdef CONFIG_TPM

-static const TPMDriverOps *
-tpm_driver_find_by_type(enum TpmType type)
+static const TPMBackendClass *
+tpm_be_find_by_type(enum TpmType type)
  {
      ObjectClass *oc;
-    TPMBackendClass *bc;
      char *typename = g_strdup_printf("tpm-%s", TpmType_str(type));

      oc = object_class_by_name(typename);
@@ -46,8 +45,7 @@ tpm_driver_find_by_type(enum TpmType type)
          return NULL;
      }

-    bc = TPM_BACKEND_CLASS(oc);
-    return bc->ops;
+    return TPM_BACKEND_CLASS(oc);
  }

  /*
@@ -61,11 +59,11 @@ static void tpm_display_backend_drivers(void)
      fprintf(stderr, "Supported TPM types (choose only one):\n");

      for (i = 0; i < TPM_TYPE__MAX; i++) {
-        const TPMDriverOps *ops = tpm_driver_find_by_type(i);
-        if (!ops) {
+        const TPMBackendClass *bc = tpm_be_find_by_type(i);
+        if (!bc) {
              continue;
          }
-        fprintf(stderr, "%12s   %s\n", TpmType_str(i), ops->desc);
+        fprintf(stderr, "%12s   %s\n", TpmType_str(i), bc->desc);
      }
      fprintf(stderr, "\n");
  }
@@ -92,7 +90,7 @@ static int configure_tpm(QemuOpts *opts)
  {
      const char *value;
      const char *id;
-    const TPMDriverOps *be;
+    const TPMBackendClass *be;
      TPMBackend *drv;
      Error *local_err = NULL;
      int i;
@@ -116,7 +114,7 @@ static int configure_tpm(QemuOpts *opts)
      }

      i = qapi_enum_parse(&TpmType_lookup, value, -1, NULL);
-    be = i >= 0 ? tpm_driver_find_by_type(i) : NULL;
+    be = i >= 0 ? tpm_be_find_by_type(i) : NULL;
      if (be == NULL) {
          error_report(QERR_INVALID_PARAMETER_VALUE,
                       "type", "a TPM backend type");
@@ -234,7 +232,7 @@ TpmTypeList *qmp_query_tpm_types(Error **errp)
      TpmTypeList *head = NULL, *prev = NULL, *cur_item;

      for (i = 0; i < TPM_TYPE__MAX; i++) {
-        if (!tpm_driver_find_by_type(i)) {
+        if (!tpm_be_find_by_type(i)) {
              continue;
          }
          cur_item = g_new0(TpmTypeList, 1);
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 0c41f1212f..c9529df67f 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2602,7 +2602,6 @@ sub process {
                                SCSIBusInfo|
                                SCSIReqOps|
                                Spice[A-Z][a-zA-Z0-9]*Interface|
-                               TPMDriverOps|
                                USBDesc[A-Z][a-zA-Z0-9]*|
                                VhostOps|
                                VMStateDescription|





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