Unverified Commit c4a50db1 authored by Clément Léger's avatar Clément Léger Committed by Palmer Dabbelt
Browse files

riscv: sbi: add SBI FWFT extension calls 



Add FWFT extension calls. This will be ratified in SBI V3.0 hence, it is
provided as a separate commit that can be left out if needed.

Signed-off-by: default avatarClément Léger <cleger@rivosinc.com>
Reviewed-by: default avatarAndrew Jones <ajones@ventanamicro.com>
Reviewed-by: default avatarAtish Patra <atishp@rivosinc.com>
Link: https://lore.kernel.org/r/20250523101932.1594077-6-cleger@rivosinc.com


Signed-off-by: default avatarPalmer Dabbelt <palmer@dabbelt.com>
parent 6d6d0641

arch/riscv/kernel/sbi.c

+19 −1
Original line number Diff line number Diff line
@@ -299,6 +299,8 @@ static int __sbi_rfence_v02(int fid, const struct cpumask *cpu_mask, 
	return 0;

}



static bool sbi_fwft_supported;



struct fwft_set_req {

	u32 feature;

	unsigned long value;
@@ -326,7 +328,15 @@ static void cpu_sbi_fwft_set(void *arg) 
 */

int sbi_fwft_set(u32 feature, unsigned long value, unsigned long flags)

{

	struct sbiret ret;



	if (!sbi_fwft_supported)

		return -EOPNOTSUPP;



	ret = sbi_ecall(SBI_EXT_FWFT, SBI_EXT_FWFT_SET,

			feature, value, flags, 0, 0, 0);



	return sbi_err_map_linux_errno(ret.error);

}



/**
@@ -348,6 +358,9 @@ int sbi_fwft_set_cpumask(const cpumask_t *mask, u32 feature, 
		.error = ATOMIC_INIT(0),

	};



	if (!sbi_fwft_supported)

		return -EOPNOTSUPP;



	if (feature & SBI_FWFT_GLOBAL_FEATURE_BIT)

		return -EINVAL;
@@ -679,6 +692,11 @@ void __init sbi_init(void) 
			pr_info("SBI DBCN extension detected\n");

			sbi_debug_console_available = true;

		}

		if (sbi_spec_version >= sbi_mk_version(3, 0) &&

		    sbi_probe_extension(SBI_EXT_FWFT)) {

			pr_info("SBI FWFT extension detected\n");

			sbi_fwft_supported = true;

		}

	} else {

		__sbi_set_timer = __sbi_set_timer_v01;

		__sbi_send_ipi	= __sbi_send_ipi_v01;