| Message ID | 20240711215846.834365-4-jesse@rivosinc.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | RISC-V: Detect and report speed of unaligned vector accesses | expand |
| Context | Check | Description |
|---|---|---|
| conchuod/vmtest-fixes-PR | fail | merge-conflict |
On Thu, Jul 11, 2024 at 05:58:42PM -0400, Jesse Taube wrote: > Originally, the check_unaligned_access_emulated_all_cpus function > only checked the boot hart. This fixes the function to check all > harts. > > Fixes: 71c54b3d169d ("riscv: report misaligned accesses emulation to hwprobe") > Signed-off-by: Jesse Taube <jesse@rivosinc.com> > Cc: stable@vger.kernel.org > --- > V1 -> V2: > - New patch > V2 -> V3: > - Split patch > V3 -> V4: > - Re-add check for a system where a heterogeneous > CPU is hotplugged into a previously homogenous > system. > --- > arch/riscv/kernel/traps_misaligned.c | 14 +++++++------- > 1 file changed, 7 insertions(+), 7 deletions(-) > > diff --git a/arch/riscv/kernel/traps_misaligned.c b/arch/riscv/kernel/traps_misaligned.c > index b62d5a2f4541..1a1bb41472ea 100644 > --- a/arch/riscv/kernel/traps_misaligned.c > +++ b/arch/riscv/kernel/traps_misaligned.c > @@ -526,11 +526,11 @@ int handle_misaligned_store(struct pt_regs *regs) > return 0; > } > > -static bool check_unaligned_access_emulated(int cpu) > +static void check_unaligned_access_emulated(struct work_struct *unused) Small change, can you give this a different name like "work" and instead give it the attribute "__always_unused" like: struct work_struct *work __always_unused Otherwise, Reviewed-by: Charlie Jenkins <charlie@rivosinc.com> > { > + int cpu = smp_processor_id(); > long *mas_ptr = per_cpu_ptr(&misaligned_access_speed, cpu); > unsigned long tmp_var, tmp_val; > - bool misaligned_emu_detected; > > *mas_ptr = RISCV_HWPROBE_MISALIGNED_UNKNOWN; > > @@ -538,19 +538,16 @@ static bool check_unaligned_access_emulated(int cpu) > " "REG_L" %[tmp], 1(%[ptr])\n" > : [tmp] "=r" (tmp_val) : [ptr] "r" (&tmp_var) : "memory"); > > - misaligned_emu_detected = (*mas_ptr == RISCV_HWPROBE_MISALIGNED_EMULATED); > /* > * If unaligned_ctl is already set, this means that we detected that all > * CPUS uses emulated misaligned access at boot time. If that changed > * when hotplugging the new cpu, this is something we don't handle. > */ > - if (unlikely(unaligned_ctl && !misaligned_emu_detected)) { > + if (unlikely(unaligned_ctl && (*mas_ptr != RISCV_HWPROBE_MISALIGNED_EMULATED))) { > pr_crit("CPU misaligned accesses non homogeneous (expected all emulated)\n"); > while (true) > cpu_relax(); > } > - > - return misaligned_emu_detected; > } > > bool check_unaligned_access_emulated_all_cpus(void) > @@ -562,8 +559,11 @@ bool check_unaligned_access_emulated_all_cpus(void) > * accesses emulated since tasks requesting such control can run on any > * CPU. > */ > + schedule_on_each_cpu(check_unaligned_access_emulated); > + > for_each_online_cpu(cpu) > - if (!check_unaligned_access_emulated(cpu)) > + if (per_cpu(misaligned_access_speed, cpu) > + != RISCV_HWPROBE_MISALIGNED_EMULATED) > return false; > > unaligned_ctl = true; > -- > 2.45.2 >
diff --git a/arch/riscv/kernel/traps_misaligned.c b/arch/riscv/kernel/traps_misaligned.c index b62d5a2f4541..1a1bb41472ea 100644 --- a/arch/riscv/kernel/traps_misaligned.c +++ b/arch/riscv/kernel/traps_misaligned.c @@ -526,11 +526,11 @@ int handle_misaligned_store(struct pt_regs *regs) return 0; } -static bool check_unaligned_access_emulated(int cpu) +static void check_unaligned_access_emulated(struct work_struct *unused) { + int cpu = smp_processor_id(); long *mas_ptr = per_cpu_ptr(&misaligned_access_speed, cpu); unsigned long tmp_var, tmp_val; - bool misaligned_emu_detected; *mas_ptr = RISCV_HWPROBE_MISALIGNED_UNKNOWN; @@ -538,19 +538,16 @@ static bool check_unaligned_access_emulated(int cpu) " "REG_L" %[tmp], 1(%[ptr])\n" : [tmp] "=r" (tmp_val) : [ptr] "r" (&tmp_var) : "memory"); - misaligned_emu_detected = (*mas_ptr == RISCV_HWPROBE_MISALIGNED_EMULATED); /* * If unaligned_ctl is already set, this means that we detected that all * CPUS uses emulated misaligned access at boot time. If that changed * when hotplugging the new cpu, this is something we don't handle. */ - if (unlikely(unaligned_ctl && !misaligned_emu_detected)) { + if (unlikely(unaligned_ctl && (*mas_ptr != RISCV_HWPROBE_MISALIGNED_EMULATED))) { pr_crit("CPU misaligned accesses non homogeneous (expected all emulated)\n"); while (true) cpu_relax(); } - - return misaligned_emu_detected; } bool check_unaligned_access_emulated_all_cpus(void) @@ -562,8 +559,11 @@ bool check_unaligned_access_emulated_all_cpus(void) * accesses emulated since tasks requesting such control can run on any * CPU. */ + schedule_on_each_cpu(check_unaligned_access_emulated); + for_each_online_cpu(cpu) - if (!check_unaligned_access_emulated(cpu)) + if (per_cpu(misaligned_access_speed, cpu) + != RISCV_HWPROBE_MISALIGNED_EMULATED) return false; unaligned_ctl = true;
Originally, the check_unaligned_access_emulated_all_cpus function only checked the boot hart. This fixes the function to check all harts. Fixes: 71c54b3d169d ("riscv: report misaligned accesses emulation to hwprobe") Signed-off-by: Jesse Taube <jesse@rivosinc.com> Cc: stable@vger.kernel.org --- V1 -> V2: - New patch V2 -> V3: - Split patch V3 -> V4: - Re-add check for a system where a heterogeneous CPU is hotplugged into a previously homogenous system. --- arch/riscv/kernel/traps_misaligned.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-)