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powerpc: Revert Load Monitor Register Support 

Load monitored is no longer supported on POWER9 so let's remove the
code.

This reverts commit bd3ea317fd ("powerpc: Load Monitor Register
Support").

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Michael Neuling 2016-10-31 13:19:39 +11:00 committed by Michael Ellerman
parent 7c65856b7e
commit 29a969b764
4 changed files with 0 additions and 34 deletions
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2
arch/powerpc/include/asm/processor.h
View File

@ -312,8 +312,6 @@ struct thread_struct {
unsigned long mmcr2;
unsigned mmcr0;
unsigned used_ebb;
unsigned long lmrr;
unsigned long lmser;
#endif
};

5
arch/powerpc/include/asm/reg.h
View File

@ -292,8 +292,6 @@
#define SPRN_HRMOR 0x139 /* Real mode offset register */
#define SPRN_HSRR0 0x13A /* Hypervisor Save/Restore 0 */
#define SPRN_HSRR1 0x13B /* Hypervisor Save/Restore 1 */
#define SPRN_LMRR 0x32D /* Load Monitor Region Register */
#define SPRN_LMSER 0x32E /* Load Monitor Section Enable Register */
#define SPRN_IC 0x350 /* Virtual Instruction Count */
#define SPRN_VTB 0x351 /* Virtual Time Base */
#define SPRN_LDBAR 0x352 /* LD Base Address Register */
@ -304,7 +302,6 @@
#define SPRN_PMCR 0x374 /* Power Management Control Register */
/* HFSCR and FSCR bit numbers are the same */
#define FSCR_LM_LG 11 /* Enable Load Monitor Registers */
#define FSCR_TAR_LG 8 /* Enable Target Address Register */
#define FSCR_EBB_LG 7 /* Enable Event Based Branching */
#define FSCR_TM_LG 5 /* Enable Transactional Memory */
@ -314,12 +311,10 @@
#define FSCR_VECVSX_LG 1 /* Enable VMX/VSX */
#define FSCR_FP_LG 0 /* Enable Floating Point */
#define SPRN_FSCR 0x099 /* Facility Status & Control Register */
#define FSCR_LM __MASK(FSCR_LM_LG)
#define FSCR_TAR __MASK(FSCR_TAR_LG)
#define FSCR_EBB __MASK(FSCR_EBB_LG)
#define FSCR_DSCR __MASK(FSCR_DSCR_LG)
#define SPRN_HFSCR 0xbe /* HV=1 Facility Status & Control Register */
#define HFSCR_LM __MASK(FSCR_LM_LG)
#define HFSCR_TAR __MASK(FSCR_TAR_LG)
#define HFSCR_EBB __MASK(FSCR_EBB_LG)
#define HFSCR_TM __MASK(FSCR_TM_LG)

18
arch/powerpc/kernel/process.c
View File

@ -1051,14 +1051,6 @@ static inline void save_sprs(struct thread_struct *t)
*/
t->tar = mfspr(SPRN_TAR);
}
if (cpu_has_feature(CPU_FTR_ARCH_300)) {
/* Conditionally save Load Monitor registers, if enabled */
if (t->fscr & FSCR_LM) {
t->lmrr = mfspr(SPRN_LMRR);
t->lmser = mfspr(SPRN_LMSER);
}
}
#endif
}
@ -1094,16 +1086,6 @@ static inline void restore_sprs(struct thread_struct *old_thread,
if (old_thread->tar != new_thread->tar)
mtspr(SPRN_TAR, new_thread->tar);
}
if (cpu_has_feature(CPU_FTR_ARCH_300)) {
/* Conditionally restore Load Monitor registers, if enabled */
if (new_thread->fscr & FSCR_LM) {
if (old_thread->lmrr != new_thread->lmrr)
mtspr(SPRN_LMRR, new_thread->lmrr);
if (old_thread->lmser != new_thread->lmser)
mtspr(SPRN_LMSER, new_thread->lmser);
}
}
#endif
}

9
arch/powerpc/kernel/traps.c
View File

@ -1430,7 +1430,6 @@ void facility_unavailable_exception(struct pt_regs *regs)
[FSCR_TM_LG] = "TM",
[FSCR_EBB_LG] = "EBB",
[FSCR_TAR_LG] = "TAR",
[FSCR_LM_LG] = "LM",
};
char *facility = "unknown";
u64 value;
@ -1488,14 +1487,6 @@ void facility_unavailable_exception(struct pt_regs *regs)
emulate_single_step(regs);
}
return;
} else if ((status == FSCR_LM_LG) && cpu_has_feature(CPU_FTR_ARCH_300)) {
/*
* This process has touched LM, so turn it on forever
* for this process
*/
current->thread.fscr |= FSCR_LM;
mtspr(SPRN_FSCR, current->thread.fscr);
return;
}
if (status == FSCR_TM_LG) {