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target/riscv: Deal with DMI busy in sample_memory_bus_v1() (#758) 

* target/riscv: Deal with DMI busy in sample_memory_bus_v1()

Change-Id: I810a4c4b7f02cb40ea99b7a500dce23c1bbd9231
Signed-off-by: Tim Newsome <tim@sifive.com>

* Comment code more clearly.

Co-authored-by: Jan Matyas <50193733+JanMatCodasip@users.noreply.github.com>
Signed-off-by: Tim Newsome <tim@sifive.com>

* Remove extra tab

Co-authored-by: Jan Matyas <50193733+JanMatCodasip@users.noreply.github.com>
Signed-off-by: Tim Newsome <tim@sifive.com>

Signed-off-by: Tim Newsome <tim@sifive.com>
Co-authored-by: Jan Matyas <50193733+JanMatCodasip@users.noreply.github.com>
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Tim Newsome 2022-11-09 14:39:19 -08:00 committed by GitHub
parent 70980e7f57
commit ae3ad22311
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1 changed files with 16 additions and 5 deletions
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21
src/target/riscv/riscv-013.c
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@ -2231,16 +2231,27 @@ static int sample_memory_bus_v1(struct target *target,
break;
}
size_t sbcs_key = riscv_batch_add_dmi_read(batch, DM_SBCS);
size_t sbcs_read_index = riscv_batch_add_dmi_read(batch, DM_SBCS);
int result = batch_run(target, batch);
if (result != ERROR_OK)
if (result != ERROR_OK) {
riscv_batch_free(batch);
return result;
}
uint32_t sbcs_read = riscv_batch_get_dmi_read_data(batch, sbcs_key);
/* Discard the batch when we encounter a busy state on the DMI level.
* It's too much hassle to try to recover partial data. We'll try again
* with a larger DMI delay. */
unsigned int sbcs_read_op = riscv_batch_get_dmi_read_op(batch, sbcs_read_index);
if (sbcs_read_op == DTM_DMI_OP_BUSY) {
increase_dmi_busy_delay(target);
continue;
}
uint32_t sbcs_read = riscv_batch_get_dmi_read_data(batch, sbcs_read_index);
if (get_field(sbcs_read, DM_SBCS_SBBUSYERROR)) {
/* Discard this batch (too much hassle to try to recover partial
* data) and try again with a larger delay. */
/* Discard this batch when we encounter "busy error" state on the System Bus level.
* We'll try next time with a larger System Bus read delay. */
info->bus_master_read_delay += info->bus_master_read_delay / 10 + 1;
dmi_write(target, DM_SBCS, sbcs_read | DM_SBCS_SBBUSYERROR | DM_SBCS_SBERROR);
riscv_batch_free(batch);