tpm_tis: move r/w_offsets to TPMState

Now that we have a single buffer, we also only need a single set of
read/write offsets into that buffer. This works since only one
locality can be active.
Signed-off-by: NStefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: NMarc-André Lureau <marcandre.lureau@redhat.com>

hw/tpm/tpm_tis.c

@@ -61,9 +61,6 @@ typedef struct TPMLocality {
     uint32_t iface_id;
     uint32_t inte;
     uint32_t ints;
-
-    uint16_t w_offset;
-    uint16_t r_offset;
 } TPMLocality;
 
 typedef struct TPMState {
@@ -71,6 +68,8 @@ typedef struct TPMState {
     MemoryRegion mmio;
 
     unsigned char buffer[TPM_TIS_BUFFER_MAX];
+    uint16_t w_offset;
+    uint16_t r_offset;
 
     uint8_t active_locty;
     uint8_t aborting_locty;
@@ -254,8 +253,6 @@ static void tpm_tis_sts_set(TPMLocality *l, uint32_t flags)
  */
 static void tpm_tis_tpm_send(TPMState *s, uint8_t locty)
 {
-    TPMLocality *locty_data = &s->loc[locty];
-
     tpm_tis_show_buffer(s->buffer, s->be_buffer_size,
                         "tpm_tis: To TPM");
 
@@ -268,7 +265,7 @@ static void tpm_tis_tpm_send(TPMState *s, uint8_t locty)
     s->cmd = (TPMBackendCmd) {
         .locty = locty,
         .in = s->buffer,
-        .in_len = locty_data->w_offset,
+        .in_len = s->w_offset,
         .out = s->buffer,
         .out_len = s->be_buffer_size,
     };
@@ -350,8 +347,8 @@ static void tpm_tis_new_active_locality(TPMState *s, uint8_t new_active_locty)
 /* abort -- this function switches the locality */
 static void tpm_tis_abort(TPMState *s, uint8_t locty)
 {
-    s->loc[locty].r_offset = 0;
-    s->loc[locty].w_offset = 0;
+    s->r_offset = 0;
+    s->w_offset = 0;
 
     DPRINTF("tpm_tis: tis_abort: new active locality is %d\n", s->next_locty);
 
@@ -418,8 +415,8 @@ static void tpm_tis_request_completed(TPMIf *ti)
     tpm_tis_sts_set(&s->loc[locty],
                     TPM_TIS_STS_VALID | TPM_TIS_STS_DATA_AVAILABLE);
     s->loc[locty].state = TPM_TIS_STATE_COMPLETION;
-    s->loc[locty].r_offset = 0;
-    s->loc[locty].w_offset = 0;
+    s->r_offset = 0;
+    s->w_offset = 0;
 
     tpm_tis_show_buffer(s->buffer, s->be_buffer_size,
                         "tpm_tis: From TPM");
@@ -444,14 +441,14 @@ static uint32_t tpm_tis_data_read(TPMState *s, uint8_t locty)
         len = MIN(tpm_cmd_get_size(&s->buffer),
                   s->be_buffer_size);
 
-        ret = s->buffer[s->loc[locty].r_offset++];
-        if (s->loc[locty].r_offset >= len) {
+        ret = s->buffer[s->r_offset++];
+        if (s->r_offset >= len) {
             /* got last byte */
             tpm_tis_sts_set(&s->loc[locty], TPM_TIS_STS_VALID);
             tpm_tis_raise_irq(s, locty, TPM_TIS_INT_STS_VALID);
         }
         DPRINTF("tpm_tis: tpm_tis_data_read byte 0x%02x   [%d]\n",
-                ret, s->loc[locty].r_offset - 1);
+                ret, s->r_offset - 1);
     }
 
     return ret;
@@ -488,24 +485,24 @@ static void tpm_tis_dump_state(void *opaque, hwaddr addr)
 
     DPRINTF("tpm_tis: read offset   : %d\n"
             "tpm_tis: result buffer : ",
-            s->loc[locty].r_offset);
+            s->r_offset);
     for (idx = 0;
          idx < MIN(tpm_cmd_get_size(&s->buffer), s->be_buffer_size);
          idx++) {
         DPRINTF("%c%02x%s",
-                s->loc[locty].r_offset == idx ? '>' : ' ',
+                s->r_offset == idx ? '>' : ' ',
                 s->buffer[idx],
                 ((idx & 0xf) == 0xf) ? "\ntpm_tis:                 " : "");
     }
     DPRINTF("\n"
             "tpm_tis: write offset  : %d\n"
             "tpm_tis: request buffer: ",
-            s->loc[locty].w_offset);
+            s->w_offset);
     for (idx = 0;
          idx < MIN(tpm_cmd_get_size(s->buffer), s->be_buffer_size);
          idx++) {
         DPRINTF("%c%02x%s",
-                s->loc[locty].w_offset == idx ? '>' : ' ',
+                s->w_offset == idx ? '>' : ' ',
                 s->buffer[idx],
                 ((idx & 0xf) == 0xf) ? "\ntpm_tis:                 " : "");
     }
@@ -570,9 +567,9 @@ static uint64_t tpm_tis_mmio_read(void *opaque, hwaddr addr,
                 val = TPM_TIS_BURST_COUNT(
                        MIN(tpm_cmd_get_size(&s->buffer),
                            s->be_buffer_size)
-                       - s->loc[locty].r_offset) | s->loc[locty].sts;
+                       - s->r_offset) | s->loc[locty].sts;
             } else {
-                avail = s->be_buffer_size - s->loc[locty].w_offset;
+                avail = s->be_buffer_size - s->w_offset;
                 /*
                  * byte-sized reads should not return 0x00 for 0x100
                  * available bytes.
@@ -836,8 +833,8 @@ static void tpm_tis_mmio_write(void *opaque, hwaddr addr,
             switch (s->loc[locty].state) {
 
             case TPM_TIS_STATE_READY:
-                s->loc[locty].w_offset = 0;
-                s->loc[locty].r_offset = 0;
+                s->w_offset = 0;
+                s->r_offset = 0;
             break;
 
             case TPM_TIS_STATE_IDLE:
@@ -855,8 +852,8 @@ static void tpm_tis_mmio_write(void *opaque, hwaddr addr,
             break;
 
             case TPM_TIS_STATE_COMPLETION:
-                s->loc[locty].w_offset = 0;
-                s->loc[locty].r_offset = 0;
+                s->w_offset = 0;
+                s->r_offset = 0;
                 /* shortcut to ready state with C/R set */
                 s->loc[locty].state = TPM_TIS_STATE_READY;
                 if (!(s->loc[locty].sts & TPM_TIS_STS_COMMAND_READY)) {
@@ -882,7 +879,7 @@ static void tpm_tis_mmio_write(void *opaque, hwaddr addr,
         } else if (val == TPM_TIS_STS_RESPONSE_RETRY) {
             switch (s->loc[locty].state) {
             case TPM_TIS_STATE_COMPLETION:
-                s->loc[locty].r_offset = 0;
+                s->r_offset = 0;
                 tpm_tis_sts_set(&s->loc[locty],
                                 TPM_TIS_STS_VALID|
                                 TPM_TIS_STS_DATA_AVAILABLE);
@@ -920,8 +917,8 @@ static void tpm_tis_mmio_write(void *opaque, hwaddr addr,
             }
 
             while ((s->loc[locty].sts & TPM_TIS_STS_EXPECT) && size > 0) {
-                if (s->loc[locty].w_offset < s->be_buffer_size) {
-                    s->buffer[s->loc[locty].w_offset++] =
+                if (s->w_offset < s->be_buffer_size) {
+                    s->buffer[s->w_offset++] =
                         (uint8_t)val;
                     val >>= 8;
                     size--;
@@ -931,13 +928,13 @@ static void tpm_tis_mmio_write(void *opaque, hwaddr addr,
             }
 
             /* check for complete packet */
-            if (s->loc[locty].w_offset > 5 &&
+            if (s->w_offset > 5 &&
                 (s->loc[locty].sts & TPM_TIS_STS_EXPECT)) {
                 /* we have a packet length - see if we have all of it */
                 bool need_irq = !(s->loc[locty].sts & TPM_TIS_STS_VALID);
 
                 len = tpm_cmd_get_size(&s->buffer);
-                if (len > s->loc[locty].w_offset) {
+                if (len > s->w_offset) {
                     tpm_tis_sts_set(&s->loc[locty],
                                     TPM_TIS_STS_EXPECT | TPM_TIS_STS_VALID);
                 } else {
@@ -1026,8 +1023,8 @@ static void tpm_tis_reset(DeviceState *dev)
         s->loc[c].ints = 0;
         s->loc[c].state = TPM_TIS_STATE_IDLE;
 
-        s->loc[c].w_offset = 0;
-        s->loc[c].r_offset = 0;
+        s->w_offset = 0;
+        s->r_offset = 0;
     }
 
     tpm_tis_do_startup_tpm(s, s->be_buffer_size);