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tpm_tis: move buffers from localities into common location

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One read buffer and one write buffer is sufficient for all localities.
The localities cannot all be active at the same time, and only the active
locality can use the r/w buffers. Inactive localities will require the
COMMAND_READY flag to be set on the STS register to move to the READY
state, which then enables access to using the buffer for writing of a
command, while all other localities are inactive.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
This commit is contained in:
Stefan Berger 2017-11-09 20:01:46 -05:00
parent e6b703f6c7
commit 0804084230
1 changed files with 15 additions and 19 deletions
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34
hw/tpm/tpm_tis.c
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@ -64,16 +64,14 @@ typedef struct TPMLocality {
uint16_t w_offset;
uint16_t r_offset;
unsigned char w_buffer[TPM_TIS_BUFFER_MAX];
unsigned char r_buffer[TPM_TIS_BUFFER_MAX];
} TPMLocality;
typedef struct TPMState {
ISADevice busdev;
MemoryRegion mmio;
uint32_t offset;
uint8_t buf[TPM_TIS_BUFFER_MAX];
unsigned char w_buffer[TPM_TIS_BUFFER_MAX];
unsigned char r_buffer[TPM_TIS_BUFFER_MAX];
uint8_t active_locty;
uint8_t aborting_locty;
@ -259,7 +257,7 @@ static void tpm_tis_tpm_send(TPMState *s, uint8_t locty)
{
TPMLocality *locty_data = &s->loc[locty];
tpm_tis_show_buffer(s->loc[locty].w_buffer, s->be_buffer_size,
tpm_tis_show_buffer(s->w_buffer, s->be_buffer_size,
"tpm_tis: To TPM");
/*
@ -270,9 +268,9 @@ static void tpm_tis_tpm_send(TPMState *s, uint8_t locty)
s->cmd = (TPMBackendCmd) {
.locty = locty,
.in = locty_data->w_buffer,
.in = s->w_buffer,
.in_len = locty_data->w_offset,
.out = locty_data->r_buffer,
.out = s->r_buffer,
.out_len = s->be_buffer_size,
};
@ -424,7 +422,7 @@ static void tpm_tis_request_completed(TPMIf *ti)
s->loc[locty].r_offset = 0;
s->loc[locty].w_offset = 0;
tpm_tis_show_buffer(s->loc[locty].r_buffer, s->be_buffer_size,
tpm_tis_show_buffer(s->r_buffer, s->be_buffer_size,
"tpm_tis: From TPM");
if (TPM_TIS_IS_VALID_LOCTY(s->next_locty)) {
@ -444,10 +442,10 @@ static uint32_t tpm_tis_data_read(TPMState *s, uint8_t locty)
uint16_t len;
if ((s->loc[locty].sts & TPM_TIS_STS_DATA_AVAILABLE)) {
len = MIN(tpm_cmd_get_size(&s->loc[locty].r_buffer),
len = MIN(tpm_cmd_get_size(&s->r_buffer),
s->be_buffer_size);
ret = s->loc[locty].r_buffer[s->loc[locty].r_offset++];
ret = s->r_buffer[s->loc[locty].r_offset++];
if (s->loc[locty].r_offset >= len) {
/* got last byte */
tpm_tis_sts_set(&s->loc[locty], TPM_TIS_STS_VALID);
@ -493,12 +491,11 @@ static void tpm_tis_dump_state(void *opaque, hwaddr addr)
"tpm_tis: result buffer : ",
s->loc[locty].r_offset);
for (idx = 0;
idx < MIN(tpm_cmd_get_size(&s->loc[locty].r_buffer),
s->be_buffer_size);
idx < MIN(tpm_cmd_get_size(&s->r_buffer), s->be_buffer_size);
idx++) {
DPRINTF("%c%02x%s",
s->loc[locty].r_offset == idx ? '>' : ' ',
s->loc[locty].r_buffer[idx],
s->r_buffer[idx],
((idx & 0xf) == 0xf) ? "\ntpm_tis: " : "");
}
DPRINTF("\n"
@ -506,12 +503,11 @@ static void tpm_tis_dump_state(void *opaque, hwaddr addr)
"tpm_tis: request buffer: ",
s->loc[locty].w_offset);
for (idx = 0;
idx < MIN(tpm_cmd_get_size(s->loc[locty].w_buffer),
s->be_buffer_size);
idx < MIN(tpm_cmd_get_size(s->w_buffer), s->be_buffer_size);
idx++) {
DPRINTF("%c%02x%s",
s->loc[locty].w_offset == idx ? '>' : ' ',
s->loc[locty].w_buffer[idx],
s->w_buffer[idx],
((idx & 0xf) == 0xf) ? "\ntpm_tis: " : "");
}
DPRINTF("\n");
@ -573,7 +569,7 @@ static uint64_t tpm_tis_mmio_read(void *opaque, hwaddr addr,
if (s->active_locty == locty) {
if ((s->loc[locty].sts & TPM_TIS_STS_DATA_AVAILABLE)) {
val = TPM_TIS_BURST_COUNT(
MIN(tpm_cmd_get_size(&s->loc[locty].r_buffer),
MIN(tpm_cmd_get_size(&s->r_buffer),
s->be_buffer_size)
- s->loc[locty].r_offset) | s->loc[locty].sts;
} else {
@ -926,7 +922,7 @@ 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->loc[locty].w_buffer[s->loc[locty].w_offset++] =
s->w_buffer[s->loc[locty].w_offset++] =
(uint8_t)val;
val >>= 8;
size--;
@ -941,7 +937,7 @@ static void tpm_tis_mmio_write(void *opaque, hwaddr addr,
/* 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->loc[locty].w_buffer);
len = tpm_cmd_get_size(&s->w_buffer);
if (len > s->loc[locty].w_offset) {
tpm_tis_sts_set(&s->loc[locty],
TPM_TIS_STS_EXPECT | TPM_TIS_STS_VALID);