linux-kernel - [PATCH 2/3] riscv: use hart id instead of cpu id on machine

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Message-Id: <20211126180411.187597-2-mick@ics.forth.gr>
Date:   Fri, 26 Nov 2021 20:04:10 +0200
From:   Nick Kossifidis <mick@....forth.gr>
To:     palmer@...belt.com, paul.walmsley@...ive.com, aou@...s.berkeley.edu
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Nick Kossifidis <mick@....forth.gr>, stable@...r.kernel.org
Subject: [PATCH 2/3] riscv: use hart id instead of cpu id on machine_kexec

raw_smp_processor_id() doesn't return the hart id as stated in
arch/riscv/include/asm/smp.h, use smp_processor_id() instead
to get the cpu id, and cpuid_to_hartid_map() to pass the hart id
to the next kernel. This fixes kexec on HiFive Unleashed/Unmatched
where cpu ids and hart ids don't match (on qemu-virt they match).

Fixes: fba8a8674f68 ("RISC-V: Add kexec support")

Signed-off-by: Nick Kossifidis <mick@....forth.gr>
Cc: stable@...r.kernel.org
---
 arch/riscv/kernel/machine_kexec.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/kernel/machine_kexec.c b/arch/riscv/kernel/machine_kexec.c
index e6eca271a..cbef0fc73 100644
--- a/arch/riscv/kernel/machine_kexec.c
+++ b/arch/riscv/kernel/machine_kexec.c
@@ -169,7 +169,8 @@ machine_kexec(struct kimage *image)
 	struct kimage_arch *internal = &image->arch;
 	unsigned long jump_addr = (unsigned long) image->start;
 	unsigned long first_ind_entry = (unsigned long) &image->head;
-	unsigned long this_hart_id = raw_smp_processor_id();
+	unsigned long this_cpu_id = smp_processor_id();
+	unsigned long this_hart_id = cpuid_to_hartid_map(this_cpu_id);
 	unsigned long fdt_addr = internal->fdt_addr;
 	void *control_code_buffer = page_address(image->control_code_page);
 	riscv_kexec_method kexec_method = NULL;
-- 
2.32.0