arm64: kgdb: Implement kgdb_roundup_cpus() to enable pseudo-NMI roundup

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Up until now we've been using the generic (weak) implementation for
kgdb_roundup_cpus() when using kgdb on arm64. Let's move to a custom
one. The advantage here is that, when pseudo-NMI is enabled on a
device, we'll be able to round up CPUs using pseudo-NMI. This allows
us to debug CPUs that are stuck with interrupts disabled. If
pseudo-NMIs are not enabled then we'll fallback to just using an IPI,
which is still slightly better than the generic implementation since
it avoids the potential situation described in the generic
kgdb_call_nmi_hook().

Co-developed-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Chen-Yu Tsai <wenst@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20230906090246.v13.6.I2ef26d1b3bfbed2d10a281942b0da7d9854de05e@changeid
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Douglas Anderson 2023-09-06 09:03:01 -07:00 • committed by Catalin Marinas

parent d7402513c9

commit 2f5cd0c7ff

1 changed files with 23 additions and 0 deletions

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arch/arm64/kernel/smp.c

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