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glibc
ppc-tle-htm-nosc.patch
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File ppc-tle-htm-nosc.patch of Package glibc
2018-09-21 Adhemerval Zanella <adhemerval.zanella@linaro.org> * sysdeps/powerpc/nptl/tcb-offsets.sym (TM_CAPABLE): Remove. * sysdeps/powerpc/nptl/tls.h (tcbhead_t): Rename tm_capable to __ununsed1. (TLS_INIT_TP, TLS_DEFINE_INIT_TP): Remove tm_capable setup. (THREAD_GET_TM_CAPABLE, THREAD_SET_TM_CAPABLE): Remove macros. * sysdeps/powerpc/powerpc32/sysdep.h, sysdeps/powerpc/powerpc64/sysdep.h (ABORT_TRANSACTION): Remove macro. * sysdeps/powerpc/sysdep.h (ABORT_TRANSACTION): Likewise. * sysdeps/unix/sysv/linux/powerpc/elision-conf.c (elision_init): Set __pthread_force_elision iff PPC_FEATURE2_HTM_NOSC is set. * sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h, sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h sysdeps/unix/sysv/linux/powerpc/syscall.S (ABORT_TRANSACTION): Remove usage. Index: glibc-2.26/sysdeps/powerpc/nptl/tcb-offsets.sym =================================================================== --- glibc-2.26.orig/sysdeps/powerpc/nptl/tcb-offsets.sym +++ glibc-2.26/sysdeps/powerpc/nptl/tcb-offsets.sym @@ -21,7 +21,6 @@ DSO_SLOT2 (offsetof (tcbhead_t, dso_sl #ifdef __powerpc64__ TCB_AT_PLATFORM (offsetof (tcbhead_t, at_platform) - TLS_TCB_OFFSET - sizeof(tcbhead_t)) #endif -TM_CAPABLE (offsetof (tcbhead_t, tm_capable) - TLS_TCB_OFFSET - sizeof (tcbhead_t)) #ifndef __powerpc64__ TCB_AT_PLATFORM (offsetof (tcbhead_t, at_platform) - TLS_TCB_OFFSET - sizeof(tcbhead_t)) PADDING (offsetof (tcbhead_t, padding) - TLS_TCB_OFFSET - sizeof(tcbhead_t)) Index: glibc-2.26/sysdeps/powerpc/nptl/tls.h =================================================================== --- glibc-2.26.orig/sysdeps/powerpc/nptl/tls.h +++ glibc-2.26/sysdeps/powerpc/nptl/tls.h @@ -67,8 +67,7 @@ typedef struct uint32_t padding; uint32_t at_platform; #endif - /* Indicate if HTM capable (ISA 2.07). */ - uint32_t tm_capable; + uint32_t __unused; /* Reservation for AT_PLATFORM data - powerpc64. */ #ifdef __powerpc64__ uint32_t at_platform; @@ -142,7 +141,6 @@ register void *__thread_register __asm__ # define TLS_INIT_TP(tcbp) \ ({ \ __thread_register = (void *) (tcbp) + TLS_TCB_OFFSET; \ - THREAD_SET_TM_CAPABLE (__tcb_hwcap & PPC_FEATURE2_HAS_HTM ? 1 : 0); \ THREAD_SET_HWCAP (__tcb_hwcap); \ THREAD_SET_AT_PLATFORM (__tcb_platform); \ NULL; \ @@ -151,8 +149,6 @@ register void *__thread_register __asm__ /* Value passed to 'clone' for initialization of the thread register. */ # define TLS_DEFINE_INIT_TP(tp, pd) \ void *tp = (void *) (pd) + TLS_TCB_OFFSET + TLS_PRE_TCB_SIZE; \ - (((tcbhead_t *) ((char *) tp - TLS_TCB_OFFSET))[-1].tm_capable) = \ - THREAD_GET_TM_CAPABLE (); \ (((tcbhead_t *) ((char *) tp - TLS_TCB_OFFSET))[-1].hwcap) = \ THREAD_GET_HWCAP (); \ (((tcbhead_t *) ((char *) tp - TLS_TCB_OFFSET))[-1].at_platform) = \ @@ -210,13 +206,6 @@ register void *__thread_register __asm__ + TLS_PRE_TCB_SIZE))[-1].pointer_guard \ = THREAD_GET_POINTER_GUARD()) -/* tm_capable field in TCB head. */ -# define THREAD_GET_TM_CAPABLE() \ - (((tcbhead_t *) ((char *) __thread_register \ - - TLS_TCB_OFFSET))[-1].tm_capable) -# define THREAD_SET_TM_CAPABLE(value) \ - (THREAD_GET_TM_CAPABLE () = (value)) - /* hwcap field in TCB head. */ # define THREAD_GET_HWCAP() \ (((tcbhead_t *) ((char *) __thread_register \ Index: glibc-2.26/sysdeps/powerpc/powerpc32/sysdep.h =================================================================== --- glibc-2.26.orig/sysdeps/powerpc/powerpc32/sysdep.h +++ glibc-2.26/sysdeps/powerpc/powerpc32/sysdep.h @@ -90,23 +90,7 @@ GOT_LABEL: ; \ cfi_endproc; \ ASM_SIZE_DIRECTIVE(name) -#if ! IS_IN(rtld) && defined (ENABLE_LOCK_ELISION) -# define ABORT_TRANSACTION \ - cmpwi 2,0; \ - beq 1f; \ - lwz 0,TM_CAPABLE(2); \ - cmpwi 0,0; \ - beq 1f; \ - li 11,_ABORT_SYSCALL; \ - tabort. 11; \ - .align 4; \ -1: -#else -# define ABORT_TRANSACTION -#endif - #define DO_CALL(syscall) \ - ABORT_TRANSACTION \ li 0,syscall; \ sc Index: glibc-2.26/sysdeps/powerpc/powerpc64/sysdep.h =================================================================== --- glibc-2.26.orig/sysdeps/powerpc/powerpc64/sysdep.h +++ glibc-2.26/sysdeps/powerpc/powerpc64/sysdep.h @@ -263,23 +263,7 @@ LT_LABELSUFFIX(name,_name_end): ; \ TRACEBACK_MASK(name,mask); \ END_2(name) -#if !IS_IN(rtld) && defined (ENABLE_LOCK_ELISION) -# define ABORT_TRANSACTION \ - cmpdi 13,0; \ - beq 1f; \ - lwz 0,TM_CAPABLE(13); \ - cmpwi 0,0; \ - beq 1f; \ - li 11,_ABORT_SYSCALL; \ - tabort. 11; \ - .p2align 4; \ -1: -#else -# define ABORT_TRANSACTION -#endif - #define DO_CALL(syscall) \ - ABORT_TRANSACTION \ li 0,syscall; \ sc Index: glibc-2.26/sysdeps/powerpc/sysdep.h =================================================================== --- glibc-2.26.orig/sysdeps/powerpc/sysdep.h +++ glibc-2.26/sysdeps/powerpc/sysdep.h @@ -21,10 +21,6 @@ */ #define _SYSDEPS_SYSDEP_H 1 #include <bits/hwcap.h> -#ifdef ENABLE_LOCK_ELISION -#include <tls.h> -#include <htm.h> -#endif #define PPC_FEATURE_970 (PPC_FEATURE_POWER4 + PPC_FEATURE_HAS_ALTIVEC) @@ -168,22 +164,4 @@ #define ALIGNARG(log2) log2 #define ASM_SIZE_DIRECTIVE(name) .size name,.-name -#else - -/* Linux kernel powerpc documentation [1] states issuing a syscall inside a - transaction is not recommended and may lead to undefined behavior. It - also states syscalls do not abort transactions. To avoid such traps, - we abort transaction just before syscalls. - - [1] Documentation/powerpc/transactional_memory.txt [Syscalls] */ -#if !IS_IN(rtld) && defined (ENABLE_LOCK_ELISION) -# define ABORT_TRANSACTION \ - ({ \ - if (THREAD_GET_TM_CAPABLE ()) \ - __libc_tabort (_ABORT_SYSCALL); \ - }) -#else -# define ABORT_TRANSACTION -#endif - #endif /* __ASSEMBLER__ */ Index: glibc-2.26/sysdeps/unix/sysv/linux/powerpc/elision-conf.c =================================================================== --- glibc-2.26.orig/sysdeps/unix/sysv/linux/powerpc/elision-conf.c +++ glibc-2.26/sysdeps/unix/sysv/linux/powerpc/elision-conf.c @@ -75,6 +75,27 @@ elision_init (int argc __attribute__ ((u } } #endif + + /* Linux from 3.9 through 4.2 do not abort HTM transaction on syscalls, + instead it suspends the transaction and resumes it when returning to + usercode. The side-effects of the syscall will always remain visible, + even if the transaction is aborted. This is an issue when a transaction + is used along with futex syscall, on pthread_cond_wait for instance, + where futex might succeed but the transaction is rolled back leading + the condition variable object in an inconsistent state. + + Glibc used to prevent it by always aborting a transaction before issuing + a syscall. Linux 4.2 also decided to abort active transaction in + syscalls which makes the glibc workaround superflours. Worse, glibc + transaction abortions leads to a performance issues on recent kernels. + + So Lock Elision is just enabled when it has been explict set (either + by tunables of by a configure switch) and if kernel aborts HTM + transactions on syscalls (PPC_FEATURE2_HTM_NOSC) */ + + __pthread_force_elision = (__pthread_force_elision + && GLRO (dl_hwcap2) & PPC_FEATURE2_HTM_NOSC); + if (!__pthread_force_elision) /* Disable elision on rwlocks. */ __elision_aconf.try_tbegin = 0; Index: glibc-2.26/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h =================================================================== --- glibc-2.26.orig/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h +++ glibc-2.26/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h @@ -109,7 +109,6 @@ register long int r11 __asm__ ("r11"); \ register long int r12 __asm__ ("r12"); \ LOADARGS_##nr(name, args); \ - ABORT_TRANSACTION; \ __asm__ __volatile__ \ ("sc \n\t" \ "mfcr %0" \ Index: glibc-2.26/sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h =================================================================== --- glibc-2.26.orig/sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h +++ glibc-2.26/sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h @@ -131,7 +131,6 @@ register long int r7 __asm__ ("r7"); \ register long int r8 __asm__ ("r8"); \ LOADARGS_##nr (name, ##args); \ - ABORT_TRANSACTION; \ __asm__ __volatile__ \ ("sc\n\t" \ "mfcr %0\n\t" \ Index: glibc-2.26/sysdeps/unix/sysv/linux/powerpc/syscall.S =================================================================== --- glibc-2.26.orig/sysdeps/unix/sysv/linux/powerpc/syscall.S +++ glibc-2.26/sysdeps/unix/sysv/linux/powerpc/syscall.S @@ -18,7 +18,6 @@ #include <sysdep.h> ENTRY (syscall) - ABORT_TRANSACTION mr r0,r3 mr r3,r4 mr r4,r5
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