[Qemu-devel] [PATCH 04/35] tpm: reorganize headers and split hardware part

[Paolo Bonzini <pbonzini@redhat.com>]

The TPM subsystem does not have a good front-end/back-end separation.
However, we can at least try to split the user interface (tpm.c) from
the implementation (hw/tpm).

The patches makes tpm.c not include tpm_int.h; instead it moves more
stuff to tpm_backend.h.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 Makefile.objs                      |  2 +-
 default-configs/i386-softmmu.mak   |  2 +-
 default-configs/x86_64-softmmu.mak |  2 +-
 hw/Makefile.objs                   |  1 +
 {tpm => hw/tpm}/Makefile.objs      |  3 +-
 {tpm => hw/tpm}/tpm_backend.c      | 14 ++++++++++
 {tpm => hw/tpm}/tpm_int.h          | 55 ++----------------------------------
 {tpm => hw/tpm}/tpm_passthrough.c  |  0
 {tpm => hw/tpm}/tpm_tis.c          |  0
 {tpm => hw/tpm}/tpm_tis.h          |  5 ----
 {tpm => include/tpm}/tpm_backend.h | 57 ++++++++++++++++++++++++++++++++++++++
 tpm/tpm.c => tpm.c                 | 18 ++----------
 12 files changed, 80 insertions(+), 79 deletions(-)
 rename {tpm => hw/tpm}/Makefile.objs (61%)
 rename {tpm => hw/tpm}/tpm_backend.c (82%)
 rename {tpm => hw/tpm}/tpm_int.h (49%)
 rename {tpm => hw/tpm}/tpm_passthrough.c (100%)
 rename {tpm => hw/tpm}/tpm_tis.c (100%)
 rename {tpm => hw/tpm}/tpm_tis.h (94%)
 rename {tpm => include/tpm}/tpm_backend.h (50%)
 rename tpm/tpm.c => tpm.c (93%)

diff --git a/Makefile.objs b/Makefile.objs
index f99841c..ff3a6b3 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -74,7 +74,7 @@ common-obj-y += bt-host.o bt-vhci.o
 
 common-obj-y += dma-helpers.o
 common-obj-y += vl.o
-common-obj-y += tpm/
+common-obj-y += tpm.o
 
 common-obj-$(CONFIG_SLIRP) += slirp/
 
diff --git a/default-configs/i386-softmmu.mak b/default-configs/i386-softmmu.mak
index 7d8908f..f70594d 100644
--- a/default-configs/i386-softmmu.mak
+++ b/default-configs/i386-softmmu.mak
@@ -26,4 +26,4 @@ CONFIG_HPET=y
 CONFIG_APPLESMC=y
 CONFIG_I8259=y
 CONFIG_PFLASH_CFI01=y
-CONFIG_TPM_TIS=$(CONFIG_TPM)
+CONFIG_TPM_TIS=y
diff --git a/default-configs/x86_64-softmmu.mak b/default-configs/x86_64-softmmu.mak
index e87e644..66c4855 100644
--- a/default-configs/x86_64-softmmu.mak
+++ b/default-configs/x86_64-softmmu.mak
@@ -26,4 +26,4 @@ CONFIG_HPET=y
 CONFIG_APPLESMC=y
 CONFIG_I8259=y
 CONFIG_PFLASH_CFI01=y
-CONFIG_TPM_TIS=$(CONFIG_TPM)
+CONFIG_TPM_TIS=y
diff --git a/hw/Makefile.objs b/hw/Makefile.objs
index 09fea2c..5626292 100644
--- a/hw/Makefile.objs
+++ b/hw/Makefile.objs
@@ -25,6 +25,7 @@ devices-dirs-$(CONFIG_SOFTMMU) += scsi/
 devices-dirs-$(CONFIG_SOFTMMU) += sd/
 devices-dirs-$(CONFIG_SOFTMMU) += ssi/
 devices-dirs-$(CONFIG_SOFTMMU) += timer/
+devices-dirs-$(CONFIG_TPM) += tpm/
 devices-dirs-$(CONFIG_SOFTMMU) += usb/
 devices-dirs-$(CONFIG_SOFTMMU) += virtio/
 devices-dirs-$(CONFIG_SOFTMMU) += watchdog/
diff --git a/tpm/Makefile.objs b/hw/tpm/Makefile.objs
similarity index 61%
rename from tpm/Makefile.objs
rename to hw/tpm/Makefile.objs
index 366e4a7..8bbed7a 100644
--- a/tpm/Makefile.objs
+++ b/hw/tpm/Makefile.objs
@@ -1,4 +1,3 @@
-common-obj-y = tpm.o
-common-obj-$(CONFIG_TPM) += tpm_backend.o
+common-obj-y += tpm_backend.o
 common-obj-$(CONFIG_TPM_TIS) += tpm_tis.o
 common-obj-$(CONFIG_TPM_PASSTHROUGH) += tpm_passthrough.o
diff --git a/tpm/tpm_backend.c b/hw/tpm/tpm_backend.c
similarity index 82%
rename from tpm/tpm_backend.c
rename to hw/tpm/tpm_backend.c
index 4144ef7..31d833c 100644
--- a/tpm/tpm_backend.c
+++ b/hw/tpm/tpm_backend.c
@@ -56,3 +56,17 @@ void tpm_backend_thread_tpm_reset(TPMBackendThread *tbt,
                            NULL);
     }
 }
+
+/*
+ * Write an error message in the given output buffer.
+ */
+void tpm_write_fatal_error_response(uint8_t *out, uint32_t out_len)
+{
+    if (out_len >= sizeof(struct tpm_resp_hdr)) {
+        struct tpm_resp_hdr *resp = (struct tpm_resp_hdr *)out;
+
+        resp->tag = cpu_to_be16(TPM_TAG_RSP_COMMAND);
+        resp->len = cpu_to_be32(sizeof(struct tpm_resp_hdr));
+        resp->errcode = cpu_to_be32(TPM_FAIL);
+    }
+}
diff --git a/tpm/tpm_int.h b/hw/tpm/tpm_int.h
similarity index 49%
rename from tpm/tpm_int.h
rename to hw/tpm/tpm_int.h
index f705643..d5f7bb8 100644
--- a/tpm/tpm_int.h
+++ b/hw/tpm/tpm_int.h
@@ -15,27 +15,8 @@
 #include "exec/memory.h"
 #include "tpm/tpm_tis.h"
 
-struct TPMDriverOps;
-typedef struct TPMDriverOps TPMDriverOps;
-
-typedef struct TPMPassthruState TPMPassthruState;
-
-typedef struct TPMBackend {
-    char *id;
-    enum TpmModel fe_model;
-    char *path;
-    char *cancel_path;
-    const TPMDriverOps *ops;
-
-    union {
-        TPMPassthruState *tpm_pt;
-    } s;
-
-    QLIST_ENTRY(TPMBackend) list;
-} TPMBackend;
-
 /* overall state of the TPM interface */
-typedef struct TPMState {
+struct TPMState {
     ISADevice busdev;
     MemoryRegion mmio;
 
@@ -48,38 +29,10 @@ typedef struct TPMState {
 
     char *backend;
     TPMBackend *be_driver;
-} TPMState;
+};
 
 #define TPM(obj) OBJECT_CHECK(TPMState, (obj), TYPE_TPM_TIS)
 
-typedef void (TPMRecvDataCB)(TPMState *, uint8_t locty);
-
-struct TPMDriverOps {
-    enum TpmType type;
-    /* get a descriptive text of the backend to display to the user */
-    const char *(*desc)(void);
-
-    TPMBackend *(*create)(QemuOpts *opts, const char *id);
-    void (*destroy)(TPMBackend *t);
-
-    /* initialize the backend */
-    int (*init)(TPMBackend *t, TPMState *s, TPMRecvDataCB *datacb);
-    /* start up the TPM on the backend */
-    int (*startup_tpm)(TPMBackend *t);
-    /* returns true if nothing will ever answer TPM requests */
-    bool (*had_startup_error)(TPMBackend *t);
-
-    size_t (*realloc_buffer)(TPMSizedBuffer *sb);
-
-    void (*deliver_request)(TPMBackend *t);
-
-    void (*reset)(TPMBackend *t);
-
-    void (*cancel_cmd)(TPMBackend *t);
-
-    bool (*get_tpm_established_flag)(TPMBackend *t);
-};
-
 struct tpm_req_hdr {
     uint16_t tag;
     uint32_t len;
@@ -105,10 +58,6 @@ struct tpm_resp_hdr {
 #define TPM_ORD_GetTicks          0xf1
 
 TPMBackend *qemu_find_tpm(const char *id);
-int tpm_register_model(enum TpmModel model);
-int tpm_register_driver(const TPMDriverOps *tdo);
-void tpm_display_backend_drivers(void);
-const TPMDriverOps *tpm_get_backend_driver(const char *type);
 void tpm_write_fatal_error_response(uint8_t *out, uint32_t out_len);
 
 extern const TPMDriverOps tpm_passthrough_driver;
diff --git a/tpm/tpm_passthrough.c b/hw/tpm/tpm_passthrough.c
similarity index 100%
rename from tpm/tpm_passthrough.c
rename to hw/tpm/tpm_passthrough.c
diff --git a/tpm/tpm_tis.c b/hw/tpm/tpm_tis.c
similarity index 100%
rename from tpm/tpm_tis.c
rename to hw/tpm/tpm_tis.c
diff --git a/tpm/tpm_tis.h b/hw/tpm/tpm_tis.h
similarity index 94%
rename from tpm/tpm_tis.h
rename to hw/tpm/tpm_tis.h
index 963682c..916152a 100644
--- a/tpm/tpm_tis.h
+++ b/hw/tpm/tpm_tis.h
@@ -35,11 +35,6 @@
 #define TYPE_TPM_TIS                "tpm-tis"
 
 
-typedef struct TPMSizedBuffer {
-    uint32_t size;
-    uint8_t  *buffer;
-} TPMSizedBuffer;
-
 typedef enum {
     TPM_TIS_STATE_IDLE = 0,
     TPM_TIS_STATE_READY,
diff --git a/tpm/tpm_backend.h b/include/tpm/tpm_backend.h
similarity index 50%
rename from tpm/tpm_backend.h
rename to include/tpm/tpm_backend.h
index 05d94d0..f5390b4 100644
--- a/tpm/tpm_backend.h
+++ b/include/tpm/tpm_backend.h
@@ -42,4 +42,61 @@ typedef enum TPMBackendCmd {
     TPM_BACKEND_CMD_TPM_RESET,
 } TPMBackendCmd;
 
+struct TPMDriverOps;
+typedef struct TPMDriverOps TPMDriverOps;
+
+typedef struct TPMState TPMState;
+typedef struct TPMPassthruState TPMPassthruState;
+
+typedef struct TPMBackend {
+    char *id;
+    enum TpmModel fe_model;
+    char *path;
+    char *cancel_path;
+    const TPMDriverOps *ops;
+
+    union {
+        TPMPassthruState *tpm_pt;
+    } s;
+
+    QLIST_ENTRY(TPMBackend) list;
+} TPMBackend;
+
+typedef void (TPMRecvDataCB)(TPMState *, uint8_t locty);
+
+typedef struct TPMSizedBuffer {
+    uint32_t size;
+    uint8_t  *buffer;
+} TPMSizedBuffer;
+
+struct TPMDriverOps {
+    enum TpmType type;
+    /* get a descriptive text of the backend to display to the user */
+    const char *(*desc)(void);
+
+    TPMBackend *(*create)(QemuOpts *opts, const char *id);
+    void (*destroy)(TPMBackend *t);
+
+    /* initialize the backend */
+    int (*init)(TPMBackend *t, TPMState *s, TPMRecvDataCB *datacb);
+    /* start up the TPM on the backend */
+    int (*startup_tpm)(TPMBackend *t);
+    /* returns true if nothing will ever answer TPM requests */
+    bool (*had_startup_error)(TPMBackend *t);
+
+    size_t (*realloc_buffer)(TPMSizedBuffer *sb);
+
+    void (*deliver_request)(TPMBackend *t);
+
+    void (*reset)(TPMBackend *t);
+
+    void (*cancel_cmd)(TPMBackend *t);
+
+    bool (*get_tpm_established_flag)(TPMBackend *t);
+};
+
+const TPMDriverOps *tpm_get_backend_driver(const char *type);
+int tpm_register_model(enum TpmModel model);
+int tpm_register_driver(const TPMDriverOps *tdo);
+
 #endif /* TPM_TPM_BACKEND_H */
diff --git a/tpm/tpm.c b/tpm.c
similarity index 93%
rename from tpm/tpm.c
rename to tpm.c
index ffd2495..49ac4cc 100644
--- a/tpm/tpm.c
+++ b/tpm.c
@@ -15,7 +15,7 @@
 
 #include "monitor/monitor.h"
 #include "qapi/qmp/qerror.h"
-#include "tpm_int.h"
+#include "tpm/tpm_backend.h"
 #include "tpm/tpm.h"
 #include "qemu/config-file.h"
 #include "qmp-commands.h"
@@ -61,20 +61,6 @@ static bool tpm_model_is_registered(enum TpmModel model)
     return false;
 }
 
-/*
- * Write an error message in the given output buffer.
- */
-void tpm_write_fatal_error_response(uint8_t *out, uint32_t out_len)
-{
-    if (out_len >= sizeof(struct tpm_resp_hdr)) {
-        struct tpm_resp_hdr *resp = (struct tpm_resp_hdr *)out;
-
-        resp->tag = cpu_to_be16(TPM_TAG_RSP_COMMAND);
-        resp->len = cpu_to_be32(sizeof(struct tpm_resp_hdr));
-        resp->errcode = cpu_to_be32(TPM_FAIL);
-    }
-}
-
 const TPMDriverOps *tpm_get_backend_driver(const char *type)
 {
     int i;
@@ -108,7 +94,7 @@ int tpm_register_driver(const TPMDriverOps *tdo)
  * Walk the list of available TPM backend drivers and display them on the
  * screen.
  */
-void tpm_display_backend_drivers(void)
+static void tpm_display_backend_drivers(void)
 {
     int i;
 
-- 
1.8.1.4