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target/riscv: fix bug in riscv_openocd_poll() function 

This code forced all harts to halt when they reported a mixture of
halted and non-halted status. This breaks long-running algorithms run
on a single core under SMP, because the first poll will force the core
executing the algorithm to halt.

Fix by adding an exception when all running cores are running under
debugger control (target->status == 4). Do not force harts to halt in
this case.

Change-Id: I940172926ed9b80b95891d8aecbd10897e148585

Signed-off-by: wangyanwen <wangyanwen@nucleisys.com>
This commit is contained in:
wangyanwen 2024-12-26 10:49:56 +08:00 committed by Huaqi Fang
parent 6b47fe31ff
commit 7259995361
1 changed files with 7 additions and 1 deletions
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8
src/target/riscv/riscv.c
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@ -3914,6 +3914,7 @@ int riscv_openocd_poll(struct target *target)
unsigned int should_resume = 0;
unsigned int halted = 0;
unsigned int running = 0;
unsigned int running_under_debug = 0;
struct target_list *entry;
foreach_smp_target(entry, targets) {
struct target *t = entry->target;
@ -3937,6 +3938,8 @@ int riscv_openocd_poll(struct target *target)
if (t->state == TARGET_RUNNING ||
t->state == TARGET_DEBUG_RUNNING)
running++;
if (t->state == TARGET_DEBUG_RUNNING)
running_under_debug++;
break;
case RPH_REMAIN_HALTED:
should_remain_halted++;
@ -3960,7 +3963,10 @@ int riscv_openocd_poll(struct target *target)
} else if (should_resume) {
LOG_TARGET_DEBUG(target, "resume all");
riscv_resume(target, true, 0, 0, 0, false);
} else if (halted && running) {
} else if (halted && running && (running_under_debug != running)) {
/* Note we don't halt when harts are running *under debug control*
(state == TARGET_DEBUG_RUNNING) because this causes early abort of
long-running algorithms running on a single core under SMP. */
LOG_TARGET_DEBUG(target, "halt all; halted=%d",
halted);
riscv_halt(target);