powerpc/pseries/mobility: signal suspend cancellation to platform (37cddc7d) · Commits · 戴 / test

If we're returning an error to user space, use H_VASI_SIGNAL to send a cancellation request to the platform. This isn't strictly required but it communicates that Linux will not attempt to complete the suspend, which allows the various entities involved to promptly end the operation in progress. Signed-off-by:

Nathan Lynch <nathanl@linux.ibm.com> Signed-off-by:

Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201207215200.1785968-14-nathanl@linux.ibm.com

arch/powerpc/platforms/pseries/mobility.c

+31 −0

Original line number	Diff line number	Diff line
		@@ -513,6 +513,35 @@ static int do_join(void *arg)
		return ret;
		}

		/*
		* Abort reason code byte 0. We use only the 'Migrating partition' value.
		*/
		enum vasi_aborting_entity {
		ORCHESTRATOR = 1,
		VSP_SOURCE = 2,
		PARTITION_FIRMWARE = 3,
		PLATFORM_FIRMWARE = 4,
		VSP_TARGET = 5,
		MIGRATING_PARTITION = 6,
		};

		static void pseries_cancel_migration(u64 handle, int err)
		{
		u32 reason_code;
		u32 detail;
		u8 entity;
		long hvrc;

		entity = MIGRATING_PARTITION;
		detail = abs(err) & 0xffffff;
		reason_code = (entity << 24) \| detail;

		hvrc = plpar_hcall_norets(H_VASI_SIGNAL, handle,
		H_VASI_SIGNAL_CANCEL, reason_code);
		if (hvrc)
		pr_err("H_VASI_SIGNAL error: %ld\n", hvrc);
		}

		static int pseries_migrate_partition(u64 handle)
		{
		atomic_t counter = ATOMIC_INIT(0);
		@@ -525,6 +554,8 @@ static int pseries_migrate_partition(u64 handle)
		ret = stop_machine(do_join, &counter, cpu_online_mask);
		if (ret == 0)
		post_mobility_fixup();
		else
		pseries_cancel_migration(handle, ret);

		return ret;
		}

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