linux-kernel - [PATCH V2 5/5] riscv/efi_stub: Support for 64bit boot-hartid

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Date:   Thu, 26 May 2022 15:41:31 +0530
From:   Sunil V L <sunilvl@...tanamicro.com>
To:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ard Biesheuvel <ardb@...nel.org>,
        Marc Zyngier <maz@...nel.org>,
        Atish Patra <atishp@...osinc.com>,
        Heinrich Schuchardt <heinrich.schuchardt@...onical.com>,
        Anup Patel <apatel@...tanamicro.com>
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-efi@...r.kernel.org, Sunil V L <sunil.vl@...il.com>,
        Sunil V L <sunilvl@...tanamicro.com>
Subject: [PATCH V2 5/5] riscv/efi_stub: Support for 64bit boot-hartid

The boot-hartid can be a 64bit value on RV64 platforms. Currently,
the "boot-hartid" in DT is assumed to be 32bit only. This patch
detects the size of the "boot-hartid" and uses 32bit or 64bit
FDT reads appropriately.

Signed-off-by: Sunil V L <sunilvl@...tanamicro.com>
---
 drivers/firmware/efi/libstub/riscv-stub.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/firmware/efi/libstub/riscv-stub.c b/drivers/firmware/efi/libstub/riscv-stub.c
index 9e85e58d1f27..b450ebf95977 100644
--- a/drivers/firmware/efi/libstub/riscv-stub.c
+++ b/drivers/firmware/efi/libstub/riscv-stub.c
@@ -8,6 +8,7 @@
 
 #include <asm/efi.h>
 #include <asm/sections.h>
+#include <asm/unaligned.h>
 
 #include "efistub.h"
 
@@ -29,7 +30,7 @@ static int get_boot_hartid_from_fdt(void)
 {
 	const void *fdt;
 	int chosen_node, len;
-	const fdt32_t *prop;
+	const void *prop;
 
 	fdt = get_efi_config_table(DEVICE_TREE_GUID);
 	if (!fdt)
@@ -40,10 +41,16 @@ static int get_boot_hartid_from_fdt(void)
 		return -EINVAL;
 
 	prop = fdt_getprop((void *)fdt, chosen_node, "boot-hartid", &len);
-	if (!prop || len != sizeof(u32))
+	if (!prop)
+		return -EINVAL;
+
+	if (len == sizeof(u32))
+		hartid = (unsigned long) fdt32_to_cpu(*(fdt32_t *)prop);
+	else if (len == sizeof(u64))
+		hartid = (unsigned long) fdt64_to_cpu(__get_unaligned_t(fdt64_t, prop));
+	else
 		return -EINVAL;
 
-	hartid = fdt32_to_cpu(*prop);
 	return 0;
 }
 
-- 
2.25.1