Le 03/08/2023 à 19:33, Nick Desaulniers a écrit : > Clang didn't recognize the instruction tlbilxlpid. This was fixed in > clang-18 [0] then backported to clang-17 [1]. To support clang-16 and > older, rather than using that instruction bare in inline asm, add it to > ppc-opcode.h and use that macro as is done elsewhere for other > instructions. Can you mention that patch in https://github.com/linuxppc/issues/issues/350 > > Link: https://github.com/ClangBuiltLinux/linux/issues/1891 > Link: https://github.com/llvm/llvm-project/issues/64080 > Link: https://github.com/llvm/llvm-project/commit/53648ac1d0c953ae6d008864dd2eddb437a92468 [0] > Link: https://github.com/llvm/llvm-project-release-prs/commit/0af7e5e54a8c7ac665773ac1ada328713e8338f5 [1] > Reported-by: kernel test robot <lkp@xxxxxxxxx> > Closes: https://lore.kernel.org/llvm/202307211945.TSPcyOhh-lkp@xxxxxxxxx/ > Suggested-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx> > Signed-off-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> > --- > Changes in v2: > - add 2 missing tabs to PPC_RAW_TLBILX_LPID > - Link to v1: https://lore.kernel.org/r/20230803-ppc_tlbilxlpid-v1-1-84a1bc5cf963@xxxxxxxxxx > --- > arch/powerpc/include/asm/ppc-opcode.h | 4 +++- > arch/powerpc/kvm/e500mc.c | 10 +++++++--- > 2 files changed, 10 insertions(+), 4 deletions(-) > > diff --git a/arch/powerpc/include/asm/ppc-opcode.h b/arch/powerpc/include/asm/ppc-opcode.h > index ef6972aa33b9..f37d8d8cbec6 100644 > --- a/arch/powerpc/include/asm/ppc-opcode.h > +++ b/arch/powerpc/include/asm/ppc-opcode.h > @@ -397,7 +397,8 @@ > #define PPC_RAW_RFCI (0x4c000066) > #define PPC_RAW_RFDI (0x4c00004e) > #define PPC_RAW_RFMCI (0x4c00004c) > -#define PPC_RAW_TLBILX(t, a, b) (0x7c000024 | __PPC_T_TLB(t) | __PPC_RA0(a) | __PPC_RB(b)) > +#define PPC_RAW_TLBILX_LPID (0x7c000024) > +#define PPC_RAW_TLBILX(t, a, b) (PPC_RAW_TLBILX_LPID | __PPC_T_TLB(t) | __PPC_RA0(a) | __PPC_RB(b)) Can we avoid changing PPC_RAW_TLBILX to minimise the churn and minimise the churn when we remove PPC_RAW_TLBILX_LPID in two years. > #define PPC_RAW_WAIT_v203 (0x7c00007c) > #define PPC_RAW_WAIT(w, p) (0x7c00003c | __PPC_WC(w) | __PPC_PL(p)) > #define PPC_RAW_TLBIE(lp, a) (0x7c000264 | ___PPC_RB(a) | ___PPC_RS(lp)) > @@ -616,6 +617,7 @@ > #define PPC_TLBILX(t, a, b) stringify_in_c(.long PPC_RAW_TLBILX(t, a, b)) > #define PPC_TLBILX_ALL(a, b) PPC_TLBILX(0, a, b) > #define PPC_TLBILX_PID(a, b) PPC_TLBILX(1, a, b) > +#define PPC_TLBILX_LPID stringify_in_c(.long PPC_RAW_TLBILX_LPID) > #define PPC_TLBILX_VA(a, b) PPC_TLBILX(3, a, b) > #define PPC_WAIT_v203 stringify_in_c(.long PPC_RAW_WAIT_v203) > #define PPC_WAIT(w, p) stringify_in_c(.long PPC_RAW_WAIT(w, p)) > diff --git a/arch/powerpc/kvm/e500mc.c b/arch/powerpc/kvm/e500mc.c > index d58df71ace58..dc054b8b5032 100644 > --- a/arch/powerpc/kvm/e500mc.c > +++ b/arch/powerpc/kvm/e500mc.c > @@ -16,10 +16,11 @@ > #include <linux/miscdevice.h> > #include <linux/module.h> > > -#include <asm/reg.h> > #include <asm/cputable.h> > -#include <asm/kvm_ppc.h> > #include <asm/dbell.h> > +#include <asm/kvm_ppc.h> > +#include <asm/ppc-opcode.h> > +#include <asm/reg.h> > > #include "booke.h" > #include "e500.h" > @@ -92,7 +93,10 @@ void kvmppc_e500_tlbil_all(struct kvmppc_vcpu_e500 *vcpu_e500) > > local_irq_save(flags); > mtspr(SPRN_MAS5, MAS5_SGS | get_lpid(&vcpu_e500->vcpu)); > - asm volatile("tlbilxlpid"); > + /* clang-17 and older could not assemble tlbilxlpid. > + * https://github.com/ClangBuiltLinux/linux/issues/1891 > + */ I think that's the networking subsystem comments style. Other parts of kernel have /* on its own empty line and the text starts following line. > + asm volatile (PPC_TLBILX_LPID); > mtspr(SPRN_MAS5, 0); > local_irq_restore(flags); > } > > --- > base-commit: 7bafbd4027ae86572f308c4ddf93120c90126332 > change-id: 20230803-ppc_tlbilxlpid-cfdbf4fd4f7f > > Best regards, Christophe
