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Optimize memory read. 

Saves 8s on the full test suite.
__archive__
Tim Newsome 2016-07-20 18:56:52 -07:00
parent 32e7a962c3
commit a916d204b9
1 changed files with 101 additions and 62 deletions
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163
src/target/riscv/riscv.c
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@ -684,6 +684,7 @@ static int wait_for_state(struct target *target, enum target_state state)
}
}
#if 0
static int wait_and_read(struct target *target, uint32_t *data, uint16_t address)
{
time_t start = time(NULL);
@ -704,6 +705,7 @@ static int wait_and_read(struct target *target, uint32_t *data, uint16_t address
}
}
}
#endif
static int read_csr(struct target *target, uint32_t *value, uint32_t csr)
{
@ -1529,66 +1531,6 @@ static int riscv_read_memory(struct target *target, uint32_t address,
{
jtag_add_ir_scan(target->tap, &select_dbus, TAP_IDLE);
#if 0
// Plain implementation, where we write the address each time.
dram_write32(target, 0, lw(S0, ZERO, DEBUG_RAM_START + 16), false);
switch (size) {
case 1:
dram_write32(target, 1, lb(S1, S0, 0), false);
dram_write32(target, 2, sw(S1, ZERO, DEBUG_RAM_START + 16), false);
break;
case 2:
dram_write32(target, 1, lh(S1, S0, 0), false);
dram_write32(target, 2, sw(S1, ZERO, DEBUG_RAM_START + 16), false);
break;
case 4:
dram_write32(target, 1, lw(S1, S0, 0), false);
dram_write32(target, 2, sw(S1, ZERO, DEBUG_RAM_START + 16), false);
break;
default:
LOG_ERROR("Unsupported size: %d", size);
return ERROR_FAIL;
}
dram_write_jump(target, 3, false);
uint32_t i = 0;
while (i <= count) {
uint64_t scan_result;
// Write the next address, set interrupt, and read the previous value.
uint64_t interrupt = 0;
if (i < count) {
interrupt = DMCONTROL_INTERRUPT;
}
dbus_status_t status = dbus_scan(target, &scan_result, DBUS_OP_CONDITIONAL_WRITE,
4, DMCONTROL_HALTNOT | interrupt | (address + i * size));
if (status == DBUS_STATUS_SUCCESS) {
if (i > 0) {
uint32_t offset = size * (i-1);
switch (size) {
case 1:
buffer[offset] = scan_result & 0xff;
break;
case 2:
buffer[offset] = scan_result & 0xff;
buffer[offset + 1] = (scan_result >> 8) & 0xff;
break;
case 4:
buffer[offset] = scan_result & 0xff;
buffer[offset + 1] = (scan_result >> 8) & 0xff;
buffer[offset + 2] = (scan_result >> 16) & 0xff;
buffer[offset + 3] = (scan_result >> 24) & 0xff;
break;
}
}
i++;
} else if (status == DBUS_STATUS_NO_WRITE || status == DBUS_STATUS_BUSY) {
// Need to retry the access that failed, which was the previous one.
} else if (status == DBUS_STATUS_FAILED) {
LOG_ERROR("dbus write failed!");
return ERROR_FAIL;
}
}
#else
cache_set(target, 0, lw(S0, ZERO, DEBUG_RAM_START + 16));
switch (size) {
case 1:
@ -1610,10 +1552,107 @@ static int riscv_read_memory(struct target *target, uint32_t address,
cache_set_jump(target, 3);
cache_write(target, 4, false);
#if 1
riscv_info_t *info = (riscv_info_t *) target->arch_info;
const int max_batch_size = 256;
uint8_t *in = malloc(max_batch_size * 8);
uint8_t *out = malloc(max_batch_size * 8);
struct scan_field *field = calloc(max_batch_size, sizeof(struct scan_field));
uint32_t i = 0;
while (i < count + 2) {
unsigned int batch_size = MIN(count + 2 - i, max_batch_size);
for (unsigned int j = 0; j < batch_size; j++) {
if (i + j == count) {
// Just insert a read so we can scan out the last value.
add_dbus_scan(target, &field[j], out + 8*j, in + 8*j,
DBUS_OP_READ, 4, DMCONTROL_HALTNOT | 0);
} else if (i + j == count + 1) {
// And check for errors.
add_dbus_scan(target, &field[j], out + 8*j, in + 8*j,
DBUS_OP_READ, info->dramsize-1, DMCONTROL_HALTNOT | 0);
} else {
// Write the next address and set interrupt.
uint32_t offset = size * (i + j);
add_dbus_scan(target, &field[j], out + 8*j, in + 8*j,
DBUS_OP_WRITE, 4,
DMCONTROL_HALTNOT | DMCONTROL_INTERRUPT | (address + offset));
}
}
int retval = jtag_execute_queue();
if (retval != ERROR_OK) {
LOG_ERROR("JTAG execute failed: %d", retval);
goto error;
}
int dbus_busy = 0;
for (unsigned int j = 0; j < batch_size; j++) {
dbus_status_t status = buf_get_u32(in + 8*j, DBUS_OP_START, DBUS_OP_SIZE);
switch (status) {
case DBUS_STATUS_SUCCESS:
break;
case DBUS_STATUS_NO_WRITE:
LOG_ERROR("Got no-write status without conditional write.");
goto error;
case DBUS_STATUS_FAILED:
LOG_ERROR("Debug RAM write failed. Hardware error?");
goto error;
case DBUS_STATUS_BUSY:
dbus_busy++;
break;
}
if (i + j > 1) {
uint32_t data = buf_get_u32(in + 8*j, DBUS_DATA_START, 32);
uint32_t offset = size * (i + j - 2);
switch (size) {
case 1:
buffer[offset] = data;
break;
case 2:
buffer[offset] = data;
buffer[offset+1] = data >> 8;
break;
case 4:
buffer[offset] = data;
buffer[offset+1] = data >> 8;
buffer[offset+2] = data >> 16;
buffer[offset+3] = data >> 24;
break;
}
}
LOG_DEBUG("j=%d status=%d data=%09" PRIx64, j, status,
buf_get_u64(in + 8*j, DBUS_DATA_START, DBUS_DATA_SIZE));
}
if (dbus_busy) {
increase_dbus_busy_delay(target);
wait_for_debugint_clear(target, false);
// Retry.
LOG_INFO("Retrying memory read starting from 0x%x with more delays", address + size * i);
} else {
i += batch_size;
}
}
free(in);
free(out);
free(field);
cache_clean(target);
return ERROR_OK;
error:
free(in);
free(out);
free(field);
return ERROR_FAIL;
#else
for (unsigned int i = 0; i < count; i++) {
dram_write32(target, 4, address + i * size, true);
uint32_t value;
uint32_t value;
if (wait_and_read(target, &value, 4) != ERROR_OK) {
LOG_ERROR("Debug interrupt didn't clear.");
return ERROR_FAIL;
@ -1636,9 +1675,9 @@ static int riscv_read_memory(struct target *target, uint32_t address,
break;
}
}
#endif
return ERROR_OK;
#endif
}
#if 1