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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On 11/07/2022 15:59, Sudeep Holla wrote: > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe > > On Sat, Jul 09, 2022 at 04:23:55PM +0100, Conor Dooley wrote: >> From: Conor Dooley >> >> RISC-V has no sane defaults to fall back on where there is no cpu-map >> in the devicetree. >> Without sane defaults, the package, core and thread IDs are all set to >> -1. This causes user-visible inaccuracies for tools like hwloc/lstopo >> which rely on the sysfs cpu topology files to detect a system's >> topology. >> >> On a PolarFire SoC, which should have 4 harts with a thread each, >> lstopo currently reports: >> >> Machine (793MB total) >> Package L#0 >> NUMANode L#0 (P#0 793MB) >> Core L#0 >> L1d L#0 (32KB) + L1i L#0 (32KB) + PU L#0 (P#0) >> L1d L#1 (32KB) + L1i L#1 (32KB) + PU L#1 (P#1) >> L1d L#2 (32KB) + L1i L#2 (32KB) + PU L#2 (P#2) >> L1d L#3 (32KB) + L1i L#3 (32KB) + PU L#3 (P#3) >> >> Adding calls to store_cpu_topology() in {boot,smp} hart bringup code >> results in the correct topolgy being reported: >> >> Machine (793MB total) >> Package L#0 >> NUMANode L#0 (P#0 793MB) >> L1d L#0 (32KB) + L1i L#0 (32KB) + Core L#0 + PU L#0 (P#0) >> L1d L#1 (32KB) + L1i L#1 (32KB) + Core L#1 + PU L#1 (P#1) >> L1d L#2 (32KB) + L1i L#2 (32KB) + Core L#2 + PU L#2 (P#2) >> L1d L#3 (32KB) + L1i L#3 (32KB) + Core L#3 + PU L#3 (P#3) >> >> CC: stable@vger.kernel.org >> Fixes: 03f11f03dbfe ("RISC-V: Parse cpu topology during boot.") >> Reported-by: Brice Goglin >> Link: https://github.com/open-mpi/hwloc/issues/536 >> Signed-off-by: Conor Dooley >> --- >> --- >> arch/riscv/Kconfig | 2 +- >> arch/riscv/kernel/smpboot.c | 4 +++- >> 2 files changed, 4 insertions(+), 2 deletions(-) >> >> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig >> index 2af0701b7518..4b6c2fdbb57c 100644 >> --- a/arch/riscv/Kconfig >> +++ b/arch/riscv/Kconfig >> @@ -52,7 +52,7 @@ config RISCV >> select COMMON_CLK >> select CPU_PM if CPU_IDLE >> select EDAC_SUPPORT >> - select GENERIC_ARCH_TOPOLOGY if SMP >> + select GENERIC_ARCH_TOPOLOGY > > I am not sure of !SMP as ARM64 is default SMP only. I have never reviewed > the arch topology code with !SMP considered. I will leave that part to > RISC-V developers. > I checked it on a D1 which is !SMP - no trouble booting and the topology reporting seemed fine. 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 11/07/2022 15:59, Sudeep Holla wrote: > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe > > On Sat, Jul 09, 2022 at 04:23:55PM +0100, Conor Dooley wrote: >> From: Conor Dooley >> >> RISC-V has no sane defaults to fall back on where there is no cpu-map >> in the devicetree. >> Without sane defaults, the package, core and thread IDs are all set to >> -1. This causes user-visible inaccuracies for tools like hwloc/lstopo >> which rely on the sysfs cpu topology files to detect a system's >> topology. >> >> On a PolarFire SoC, which should have 4 harts with a thread each, >> lstopo currently reports: >> >> Machine (793MB total) >> Package L#0 >> NUMANode L#0 (P#0 793MB) >> Core L#0 >> L1d L#0 (32KB) + L1i L#0 (32KB) + PU L#0 (P#0) >> L1d L#1 (32KB) + L1i L#1 (32KB) + PU L#1 (P#1) >> L1d L#2 (32KB) + L1i L#2 (32KB) + PU L#2 (P#2) >> L1d L#3 (32KB) + L1i L#3 (32KB) + PU L#3 (P#3) >> >> Adding calls to store_cpu_topology() in {boot,smp} hart bringup code >> results in the correct topolgy being reported: >> >> Machine (793MB total) >> Package L#0 >> NUMANode L#0 (P#0 793MB) >> L1d L#0 (32KB) + L1i L#0 (32KB) + Core L#0 + PU L#0 (P#0) >> L1d L#1 (32KB) + L1i L#1 (32KB) + Core L#1 + PU L#1 (P#1) >> L1d L#2 (32KB) + L1i L#2 (32KB) + Core L#2 + PU L#2 (P#2) >> L1d L#3 (32KB) + L1i L#3 (32KB) + Core L#3 + PU L#3 (P#3) >> >> CC: stable@vger.kernel.org >> Fixes: 03f11f03dbfe ("RISC-V: Parse cpu topology during boot.") >> Reported-by: Brice Goglin >> Link: https://github.com/open-mpi/hwloc/issues/536 >> Signed-off-by: Conor Dooley >> --- >> --- >> arch/riscv/Kconfig | 2 +- >> arch/riscv/kernel/smpboot.c | 4 +++- >> 2 files changed, 4 insertions(+), 2 deletions(-) >> >> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig >> index 2af0701b7518..4b6c2fdbb57c 100644 >> --- a/arch/riscv/Kconfig >> +++ b/arch/riscv/Kconfig >> @@ -52,7 +52,7 @@ config RISCV >> select COMMON_CLK >> select CPU_PM if CPU_IDLE >> select EDAC_SUPPORT >> - select GENERIC_ARCH_TOPOLOGY if SMP >> + select GENERIC_ARCH_TOPOLOGY > > I am not sure of !SMP as ARM64 is default SMP only. I have never reviewed > the arch topology code with !SMP considered. I will leave that part to > RISC-V developers. > I checked it on a D1 which is !SMP - no trouble booting and the topology reporting seemed fine. 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