Re: [PATCH v6 05/14] riscv: sbi: add SBI FWFT extension calls

On 4/24/25 10:31 AM, Clément Léger wrote:

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: Clément Léger cleger@rivosinc.com Reviewed-by: Andrew Jones ajones@ventanamicro.com

---

arch/riscv/kernel/sbi.c | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/kernel/sbi.c b/arch/riscv/kernel/sbi.c index d57e4dae7dac..070014ff35d4 100644 --- a/arch/riscv/kernel/sbi.c +++ b/arch/riscv/kernel/sbi.c @@ -299,6 +299,8 @@ static int __sbi_rfence_v02(int fid, const struct cpumask *cpu_mask, return 0; } +static bool sbi_fwft_supported;

super nit: Can declare this along with struct fwft_set_req so that they are together ? You can move the sbi_fwft_set to below the struct fwft_set_req.

/**

• sbi_fwft_set() - Set a feature on the local hart
• @feature: The feature ID to be set

@@ -309,7 +311,15 @@ static int __sbi_rfence_v02(int fid, const struct cpumask *cpu_mask, */ int sbi_fwft_set(u32 feature, unsigned long value, unsigned long flags) {

• return -EOPNOTSUPP;

• 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); }

struct fwft_set_req { @@ -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;

Otherwise, LGTM.

Reviewed-by: Atish Patra atishp@rivosinc.com