linux-dev/arch/powerpc/include/asm/vdso, branch master

powerpc/64s: Make POWER10 and later use pause_short in cpu_relax loops

2022-09-28T09:22:10Z

We want to move away from using SMT priority updates for cpu_relax, and use a 'wait' instruction which is similar to x86. As well as being a much better fit for what everybody else uses and tests with, priority nops are stateful which is nasty (interrupts have to consider they might be taken at a different priority), and they're expensive to execute, similar to a mtSPR which can effect other threads in the pipe. This has shown to give results that are less affected by code alignment on benchmarks that cause a lot of spin waiting (e.g., rwsem contention on unixbench filesystem benchmarks) on POWER10. QEMU TCG only supports this instruction correctly since v7.1, versions without the fix may cause hangs whne running POWER10 CPUs. Reviewed-by: Segher Boessenkool Signed-off-by: Nicholas Piggin [mpe: Fix checkpatch warnings RE the macros] Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220920122259.363092-2-npiggin@gmail.com

powerpc: Change CONFIG_E500 to CONFIG_PPC_E500

2022-09-26T13:00:13Z

It will be used outside arch/powerpc, make it clear its a powerpc configuration item. And we already have CONFIG_PPC_E500MC, so that will make it more consistent. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/e63b22083c11c4300f4a82d3123a46e5fdd54fa6.1663606876.git.christophe.leroy@csgroup.eu

powerpc/vdso: Move cvdso_call macro into gettimeofday.S

2022-02-12T11:47:44Z

Now that gettimeofday.S is unique, move cvdso_call macro into that file which is the only user. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/72720359d4c58e3a3b96dd74952741225faac3de.1642782130.git.christophe.leroy@csgroup.eu

powerpc/vdso: Remove cvdso_call_time macro

2022-02-12T11:47:43Z

cvdso_call_time macro is very similar to cvdso_call macro. Add a call_time argument to cvdso_call which is 0 by default and set to 1 when using cvdso_call to call __c_kernel_time(). Return returned value as is with CR[SO] cleared when it is used for time(). Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/837a260ad86fc1ce297a562c2117fd69be5f7b5c.1642782130.git.christophe.leroy@csgroup.eu

powerpc: Redefine HMT_xxx macros as empty on PPC32

2021-08-26T14:56:52Z

HMT_xxx macros are macros for adjusting thread priority (hardware multi-threading) are macros inherited from PPC64 via commit 5f7c690728ac ("[PATCH] powerpc: Merged ppc_asm.h") Those instructions are pointless on PPC32, but some common fonctions like arch_cpu_idle() use them. So make them empty on PPC32 to avoid those instructions. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/c5a07fadea33d640ad10cecf0ac8faaec1c524e0.1629898474.git.christophe.leroy@csgroup.eu

powerpc/vdso: Add support for time namespaces

2021-04-14T13:04:44Z

This patch adds the necessary glue to provide time namespaces. Things are mainly copied from ARM64. __arch_get_timens_vdso_data() calculates timens vdso data position based on the vdso data position, knowing it is the next page in vvar. This avoids having to redo the mflr/bcl/mflr/mtlr dance to locate the page relative to running code position. Signed-off-by: Christophe Leroy Reviewed-by: Vincenzo Frascino # vDSO parts Acked-by: Andrei Vagin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/1a15495f80ec19a87b16cf874dbf7c3fa5ec40fe.1617209142.git.christophe.leroy@csgroup.eu

Merge tag 'powerpc-5.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

2021-02-22T22:34:00Z

Pull powerpc updates from Michael Ellerman: - A large series adding wrappers for our interrupt handlers, so that irq/nmi/user tracking can be isolated in the wrappers rather than spread in each handler. - Conversion of the 32-bit syscall handling into C. - A series from Nick to streamline our TLB flushing when using the Radix MMU. - Switch to using queued spinlocks by default for 64-bit server CPUs. - A rework of our PCI probing so that it happens later in boot, when more generic infrastructure is available. - Two small fixes to allow 32-bit little-endian processes to run on 64-bit kernels. - Other smaller features, fixes & cleanups. Thanks to: Alexey Kardashevskiy, Ananth N Mavinakayanahalli, Aneesh Kumar K.V, Athira Rajeev, Bhaskar Chowdhury, Cédric Le Goater, Chengyang Fan, Christophe Leroy, Christopher M. Riedl, Fabiano Rosas, Florian Fainelli, Frederic Barrat, Ganesh Goudar, Hari Bathini, Jiapeng Chong, Joseph J Allen, Kajol Jain, Markus Elfring, Michal Suchanek, Nathan Lynch, Naveen N. Rao, Nicholas Piggin, Oliver O'Halloran, Pingfan Liu, Po-Hsu Lin, Qian Cai, Ram Pai, Randy Dunlap, Sandipan Das, Stephen Rothwell, Tyrel Datwyler, Will Springer, Yury Norov, and Zheng Yongjun. * tag 'powerpc-5.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (188 commits) powerpc/perf: Adds support for programming of Thresholding in P10 powerpc/pci: Remove unimplemented prototypes powerpc/uaccess: Merge raw_copy_to_user_allowed() into raw_copy_to_user() powerpc/uaccess: Merge __put_user_size_allowed() into __put_user_size() powerpc/uaccess: get rid of small constant size cases in raw_copy_{to,from}_user() powerpc/64: Fix stack trace not displaying final frame powerpc/time: Remove get_tbl() powerpc/time: Avoid using get_tbl() spi: mpc52xx: Avoid using get_tbl() powerpc/syscall: Avoid storing 'current' in another pointer powerpc/32: Handle bookE debugging in C in syscall entry/exit powerpc/syscall: Do not check unsupported scv vector on PPC32 powerpc/32: Remove the counter in global_dbcr0 powerpc/32: Remove verification of MSR_PR on syscall in the ASM entry powerpc/syscall: implement system call entry/exit logic in C for PPC32 powerpc/32: Always save non volatile GPRs at syscall entry powerpc/syscall: Change condition to check MSR_RI powerpc/syscall: Save r3 in regs->orig_r3 powerpc/syscall: Use is_compat_task() powerpc/syscall: Make interrupt.c buildable on PPC32 ...

powerpc/time: Remove get_tbl()

2021-02-11T12:35:13Z

There are no more users of get_tbl(). Remove it. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/dd0368bfd497ffe06b31ee1b5f2ebf7760e30900.1612866360.git.christophe.leroy@csgroup.eu

powerpc/vdso: Fix clock_gettime_fallback for vdso32

2021-01-14T04:56:44Z

The second argument of __kernel_clock_gettime64 points to a struct __kernel_timespec, with 64-bit time_t, so use the clock_gettime64 syscall in the fallback function for the 32-bit VDSO. Similarly, clock_getres_fallback should use the clock_getres_time64 syscall, though it isn't yet called from the 32-bit VDSO. Fixes: d0e3fc69d00d ("powerpc/vdso: Provide __kernel_clock_gettime64() on vdso32") Signed-off-by: Andreas Schwab [chleroy: Moved into a single #ifdef __powerpc64__ block] Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/0c0ab0eb3cc80687c326f76ff0dd5762b8812ecc.1610452505.git.christophe.leroy@csgroup.eu

powerpc/time: Force inlining of get_tb()

2020-12-21T11:06:10Z

Force inlining of get_tb() in order to avoid getting following function in vdso32, leading to suboptimal performance in clock_gettime() 00000688 <.get_tb>: 688: 7c 6d 42 a6 mftbu r3 68c: 7c 8c 42 a6 mftb r4 690: 7d 2d 42 a6 mftbu r9 694: 7c 03 48 40 cmplw r3,r9 698: 40 e2 ff f0 bne+ 688 <.get_tb> 69c: 4e 80 00 20 blr Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/df05d53eed1210cf1aa76d1fb44aa0fab29c018e.1608488286.git.christophe.leroy@csgroup.eu