mirrors/linux
2
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-05-11 00:42:56 -04:00
Code Issues Packages Projects Releases Wiki Activity

riscv: Fix set up of vector cpu hotplug callback

Browse Source 
Whether or not we have RISCV_PROBE_VECTOR_UNALIGNED_ACCESS we need to
set up a cpu hotplug callback to check if we have vector at all,
since, when we don't have vector, we need to set
vector_misaligned_access to unsupported rather than leave it the
default of unknown.

Fixes: e7c9d66e31 ("RISC-V: Report vector unaligned access speed hwprobe")
Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
Link: https://lore.kernel.org/r/20250304120014.143628-16-ajones@ventanamicro.com
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
This commit is contained in:
Andrew Jones
2025-03-04 13:00:21 +01:00
committed by Alexandre Ghiti
parent 05ee21f0fc
commit 2744ec472d
1 changed files with 18 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

35
arch/riscv/kernel/unaligned_access_speed.c
View File

@@ -356,21 +356,6 @@ static void check_vector_unaligned_access(struct work_struct *work __always_unus
per_cpu(vector_misaligned_access, cpu) = speed;
}
static int riscv_online_cpu_vec(unsigned int cpu)
{
if (!has_vector()) {
per_cpu(vector_misaligned_access, cpu) = RISCV_HWPROBE_MISALIGNED_VECTOR_UNSUPPORTED;
return 0;
}
if (per_cpu(vector_misaligned_access, cpu) != RISCV_HWPROBE_MISALIGNED_VECTOR_UNKNOWN)
return 0;
check_vector_unaligned_access_emulated(NULL);
check_vector_unaligned_access(NULL);
return 0;
}
/* Measure unaligned access speed on all CPUs present at boot in parallel. */
static int __init vec_check_unaligned_access_speed_all_cpus(void *unused __always_unused)
{
@@ -385,6 +370,24 @@ static int __init vec_check_unaligned_access_speed_all_cpus(void *unused __alway
}
#endif
static int riscv_online_cpu_vec(unsigned int cpu)
{
if (!has_vector()) {
per_cpu(vector_misaligned_access, cpu) = RISCV_HWPROBE_MISALIGNED_VECTOR_UNSUPPORTED;
return 0;
}
#ifdef CONFIG_RISCV_PROBE_VECTOR_UNALIGNED_ACCESS
if (per_cpu(vector_misaligned_access, cpu) != RISCV_HWPROBE_MISALIGNED_VECTOR_UNKNOWN)
return 0;
check_vector_unaligned_access_emulated(NULL);
check_vector_unaligned_access(NULL);
#endif
return 0;
}
static int __init check_unaligned_access_all_cpus(void)
{
int cpu;
@@ -409,10 +412,8 @@ static int __init check_unaligned_access_all_cpus(void)
cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, "riscv:online",
riscv_online_cpu, riscv_offline_cpu);
#endif
#ifdef CONFIG_RISCV_PROBE_VECTOR_UNALIGNED_ACCESS
cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, "riscv:online",
riscv_online_cpu_vec, NULL);
#endif
return 0;
}