On Thu, Jun 27, 2024 at 10:22:38AM -0700, Evan Green wrote: > In preparation for misaligned vector performance hwprobe keys, rename > the hwprobe key values associated with misaligned scalar accesses to > include the term SCALAR. Leave the old defines in place to maintain > source compatibility. > > This change is intended to be a functional no-op. > > Signed-off-by: Evan Green <evan@xxxxxxxxxxxx> > Reviewed-by: Charlie Jenkins <charlie@xxxxxxxxxxxx> > > --- > > Changes in v3: > - Leave the old defines in place (Conor, Palmer) > > Changes in v2: > - Added patch to rename misaligned perf key values (Palmer) > > Documentation/arch/riscv/hwprobe.rst | 14 +++++++------- > arch/riscv/include/uapi/asm/hwprobe.h | 5 +++++ > arch/riscv/kernel/sys_hwprobe.c | 10 +++++----- > arch/riscv/kernel/traps_misaligned.c | 6 +++--- > arch/riscv/kernel/unaligned_access_speed.c | 12 ++++++------ > 5 files changed, 26 insertions(+), 21 deletions(-) > > diff --git a/Documentation/arch/riscv/hwprobe.rst b/Documentation/arch/riscv/hwprobe.rst > index 7121a00a8464..0d14e9d83a78 100644 > --- a/Documentation/arch/riscv/hwprobe.rst > +++ b/Documentation/arch/riscv/hwprobe.rst > @@ -243,23 +243,23 @@ The following keys are defined: > the performance of misaligned scalar native word accesses on the selected set > of processors. > > - * :c:macro:`RISCV_HWPROBE_MISALIGNED_UNKNOWN`: The performance of misaligned > - accesses is unknown. > + * :c:macro:`RISCV_HWPROBE_MISALIGNED_SCALAR_UNKNOWN`: The performance of > + misaligned accesses is unknown. Hey Evan, This series hasn't landed yet, can you rebase and resend? There is a patch [1] that changes the wording of this description to "misaligned scalar" instead of "misaligned". Can you apply that wording change to these new keys? - Charlie Link: https://lore.kernel.org/linux-riscv/CAJgzZorn5anPH8dVPqvjVWmLKqTi5bkLDR=FH-ZAcdXFnNe8Eg@xxxxxxxxxxxxxx/ > > - * :c:macro:`RISCV_HWPROBE_MISALIGNED_EMULATED`: Misaligned accesses are > + * :c:macro:`RISCV_HWPROBE_MISALIGNED_SCALAR_EMULATED`: Misaligned accesses are > emulated via software, either in or below the kernel. These accesses are > always extremely slow. > > - * :c:macro:`RISCV_HWPROBE_MISALIGNED_SLOW`: Misaligned native word > + * :c:macro:`RISCV_HWPROBE_MISALIGNED_SCALAR_SLOW`: Misaligned native word > sized accesses are slower than the equivalent quantity of byte accesses. > Misaligned accesses may be supported directly in hardware, or trapped and > emulated by software. > > - * :c:macro:`RISCV_HWPROBE_MISALIGNED_FAST`: Misaligned native word > + * :c:macro:`RISCV_HWPROBE_MISALIGNED_SCALAR_FAST`: Misaligned native word > sized accesses are faster than the equivalent quantity of byte accesses. > > - * :c:macro:`RISCV_HWPROBE_MISALIGNED_UNSUPPORTED`: Misaligned accesses are > - not supported at all and will generate a misaligned address fault. > + * :c:macro:`RISCV_HWPROBE_MISALIGNED_SCALAR_UNSUPPORTED`: Misaligned accesses > + are not supported at all and will generate a misaligned address fault. > > * :c:macro:`RISCV_HWPROBE_KEY_ZICBOZ_BLOCK_SIZE`: An unsigned int which > represents the size of the Zicboz block in bytes. > diff --git a/arch/riscv/include/uapi/asm/hwprobe.h b/arch/riscv/include/uapi/asm/hwprobe.h > index 7ebb2f2cc4cf..bcb2d91241d5 100644 > --- a/arch/riscv/include/uapi/asm/hwprobe.h > +++ b/arch/riscv/include/uapi/asm/hwprobe.h > @@ -80,6 +80,11 @@ struct riscv_hwprobe { > #define RISCV_HWPROBE_MISALIGNED_MASK (7 << 0) > #define RISCV_HWPROBE_KEY_ZICBOZ_BLOCK_SIZE 6 > #define RISCV_HWPROBE_KEY_MISALIGNED_SCALAR_PERF 7 > +#define RISCV_HWPROBE_MISALIGNED_SCALAR_UNKNOWN 0 > +#define RISCV_HWPROBE_MISALIGNED_SCALAR_EMULATED 1 > +#define RISCV_HWPROBE_MISALIGNED_SCALAR_SLOW 2 > +#define RISCV_HWPROBE_MISALIGNED_SCALAR_FAST 3 > +#define RISCV_HWPROBE_MISALIGNED_SCALAR_UNSUPPORTED 4 > /* Increase RISCV_HWPROBE_MAX_KEY when adding items. */ > > /* Flags */ > diff --git a/arch/riscv/kernel/sys_hwprobe.c b/arch/riscv/kernel/sys_hwprobe.c > index b18639020c61..d5541f6c843e 100644 > --- a/arch/riscv/kernel/sys_hwprobe.c > +++ b/arch/riscv/kernel/sys_hwprobe.c > @@ -176,13 +176,13 @@ static u64 hwprobe_misaligned(const struct cpumask *cpus) > perf = this_perf; > > if (perf != this_perf) { > - perf = RISCV_HWPROBE_MISALIGNED_UNKNOWN; > + perf = RISCV_HWPROBE_MISALIGNED_SCALAR_UNKNOWN; > break; > } > } > > if (perf == -1ULL) > - return RISCV_HWPROBE_MISALIGNED_UNKNOWN; > + return RISCV_HWPROBE_MISALIGNED_SCALAR_UNKNOWN; > > return perf; > } > @@ -190,12 +190,12 @@ static u64 hwprobe_misaligned(const struct cpumask *cpus) > static u64 hwprobe_misaligned(const struct cpumask *cpus) > { > if (IS_ENABLED(CONFIG_RISCV_EFFICIENT_UNALIGNED_ACCESS)) > - return RISCV_HWPROBE_MISALIGNED_FAST; > + return RISCV_HWPROBE_MISALIGNED_SCALAR_FAST; > > if (IS_ENABLED(CONFIG_RISCV_EMULATED_UNALIGNED_ACCESS) && unaligned_ctl_available()) > - return RISCV_HWPROBE_MISALIGNED_EMULATED; > + return RISCV_HWPROBE_MISALIGNED_SCALAR_EMULATED; > > - return RISCV_HWPROBE_MISALIGNED_SLOW; > + return RISCV_HWPROBE_MISALIGNED_SCALAR_SLOW; > } > #endif > > diff --git a/arch/riscv/kernel/traps_misaligned.c b/arch/riscv/kernel/traps_misaligned.c > index b62d5a2f4541..192cd5603e95 100644 > --- a/arch/riscv/kernel/traps_misaligned.c > +++ b/arch/riscv/kernel/traps_misaligned.c > @@ -338,7 +338,7 @@ int handle_misaligned_load(struct pt_regs *regs) > perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS, 1, regs, addr); > > #ifdef CONFIG_RISCV_PROBE_UNALIGNED_ACCESS > - *this_cpu_ptr(&misaligned_access_speed) = RISCV_HWPROBE_MISALIGNED_EMULATED; > + *this_cpu_ptr(&misaligned_access_speed) = RISCV_HWPROBE_MISALIGNED_SCALAR_EMULATED; > #endif > > if (!unaligned_enabled) > @@ -532,13 +532,13 @@ static bool check_unaligned_access_emulated(int cpu) > unsigned long tmp_var, tmp_val; > bool misaligned_emu_detected; > > - *mas_ptr = RISCV_HWPROBE_MISALIGNED_UNKNOWN; > + *mas_ptr = RISCV_HWPROBE_MISALIGNED_SCALAR_UNKNOWN; > > __asm__ __volatile__ ( > " "REG_L" %[tmp], 1(%[ptr])\n" > : [tmp] "=r" (tmp_val) : [ptr] "r" (&tmp_var) : "memory"); > > - misaligned_emu_detected = (*mas_ptr == RISCV_HWPROBE_MISALIGNED_EMULATED); > + misaligned_emu_detected = (*mas_ptr == RISCV_HWPROBE_MISALIGNED_SCALAR_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 > diff --git a/arch/riscv/kernel/unaligned_access_speed.c b/arch/riscv/kernel/unaligned_access_speed.c > index a9a6bcb02acf..160628a2116d 100644 > --- a/arch/riscv/kernel/unaligned_access_speed.c > +++ b/arch/riscv/kernel/unaligned_access_speed.c > @@ -34,9 +34,9 @@ static int check_unaligned_access(void *param) > struct page *page = param; > void *dst; > void *src; > - long speed = RISCV_HWPROBE_MISALIGNED_SLOW; > + long speed = RISCV_HWPROBE_MISALIGNED_SCALAR_SLOW; > > - if (per_cpu(misaligned_access_speed, cpu) != RISCV_HWPROBE_MISALIGNED_UNKNOWN) > + if (per_cpu(misaligned_access_speed, cpu) != RISCV_HWPROBE_MISALIGNED_SCALAR_UNKNOWN) > return 0; > > /* Make an unaligned destination buffer. */ > @@ -95,14 +95,14 @@ static int check_unaligned_access(void *param) > } > > if (word_cycles < byte_cycles) > - speed = RISCV_HWPROBE_MISALIGNED_FAST; > + speed = RISCV_HWPROBE_MISALIGNED_SCALAR_FAST; > > ratio = div_u64((byte_cycles * 100), word_cycles); > pr_info("cpu%d: Ratio of byte access time to unaligned word access is %d.%02d, unaligned accesses are %s\n", > cpu, > ratio / 100, > ratio % 100, > - (speed == RISCV_HWPROBE_MISALIGNED_FAST) ? "fast" : "slow"); > + (speed == RISCV_HWPROBE_MISALIGNED_SCALAR_FAST) ? "fast" : "slow"); > > per_cpu(misaligned_access_speed, cpu) = speed; > > @@ -110,7 +110,7 @@ static int check_unaligned_access(void *param) > * Set the value of fast_misaligned_access of a CPU. These operations > * are atomic to avoid race conditions. > */ > - if (speed == RISCV_HWPROBE_MISALIGNED_FAST) > + if (speed == RISCV_HWPROBE_MISALIGNED_SCALAR_FAST) > cpumask_set_cpu(cpu, &fast_misaligned_access); > else > cpumask_clear_cpu(cpu, &fast_misaligned_access); > @@ -188,7 +188,7 @@ static int riscv_online_cpu(unsigned int cpu) > static struct page *buf; > > /* We are already set since the last check */ > - if (per_cpu(misaligned_access_speed, cpu) != RISCV_HWPROBE_MISALIGNED_UNKNOWN) > + if (per_cpu(misaligned_access_speed, cpu) != RISCV_HWPROBE_MISALIGNED_SCALAR_UNKNOWN) > goto exit; > > buf = alloc_pages(GFP_KERNEL, MISALIGNED_BUFFER_ORDER); > -- > 2.34.1 >
