AuxXxilium/linux_dsm_epyc7002
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Merge branch 'fixes' into next

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Merge our fixes branch. In particular the radix segment exception
handling fix is necessary to avoid odd crashes.
This commit is contained in:
Michael Ellerman 2019-04-20 21:59:57 +10:00
commit d3e76a1acd
4 changed files with 14 additions and 10 deletions
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2
arch/powerpc/include/asm/mmu.h
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@ -352,7 +352,7 @@ static inline bool strict_kernel_rwx_enabled(void)
#if defined(CONFIG_SPARSEMEM_VMEMMAP) && defined(CONFIG_SPARSEMEM_EXTREME) && \
defined (CONFIG_PPC_64K_PAGES)
#define MAX_PHYSMEM_BITS 51
#elif defined(CONFIG_SPARSEMEM)
#elif defined(CONFIG_PPC64)
#define MAX_PHYSMEM_BITS 46
#endif

12
arch/powerpc/kernel/exceptions-64s.S
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@ -656,11 +656,17 @@ EXC_COMMON_BEGIN(data_access_slb_common)
ld r4,PACA_EXSLB+EX_DAR(r13)
std r4,_DAR(r1)
addi r3,r1,STACK_FRAME_OVERHEAD
BEGIN_MMU_FTR_SECTION
/* HPT case, do SLB fault */
bl do_slb_fault
cmpdi r3,0
bne- 1f
b fast_exception_return
1: /* Error case */
MMU_FTR_SECTION_ELSE
/* Radix case, access is outside page table range */
li r3,-EFAULT
ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
std r3,RESULT(r1)
bl save_nvgprs
RECONCILE_IRQ_STATE(r10, r11)
@ -705,11 +711,17 @@ EXC_COMMON_BEGIN(instruction_access_slb_common)
EXCEPTION_PROLOG_COMMON(0x480, PACA_EXSLB)
ld r4,_NIP(r1)
addi r3,r1,STACK_FRAME_OVERHEAD
BEGIN_MMU_FTR_SECTION
/* HPT case, do SLB fault */
bl do_slb_fault
cmpdi r3,0
bne- 1f
b fast_exception_return
1: /* Error case */
MMU_FTR_SECTION_ELSE
/* Radix case, access is outside page table range */
li r3,-EFAULT
ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
std r3,RESULT(r1)
bl save_nvgprs
RECONCILE_IRQ_STATE(r10, r11)

8
arch/powerpc/kernel/head_32.S
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@ -851,10 +851,6 @@ __secondary_start:
tophys(r4,r2)
addi r4,r4,THREAD /* phys address of our thread_struct */
mtspr SPRN_SPRG_THREAD,r4
#ifdef CONFIG_PPC_RTAS
li r3,0
stw r3, RTAS_SP(r4) /* 0 => not in RTAS */
#endif
lis r4, (swapper_pg_dir - PAGE_OFFSET)@h
ori r4, r4, (swapper_pg_dir - PAGE_OFFSET)@l
mtspr SPRN_SPRG_PGDIR, r4
@ -941,10 +937,6 @@ start_here:
tophys(r4,r2)
addi r4,r4,THREAD /* init task's THREAD */
mtspr SPRN_SPRG_THREAD,r4
#ifdef CONFIG_PPC_RTAS
li r3,0
stw r3, RTAS_SP(r4) /* 0 => not in RTAS */
#endif
lis r4, (swapper_pg_dir - PAGE_OFFSET)@h
ori r4, r4, (swapper_pg_dir - PAGE_OFFSET)@l
mtspr SPRN_SPRG_PGDIR, r4

2
arch/powerpc/kernel/vdso32/gettimeofday.S
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@ -98,7 +98,7 @@ V_FUNCTION_BEGIN(__kernel_clock_gettime)
* can be used, r7 contains NSEC_PER_SEC.
*/
lwz r5,WTOM_CLOCK_SEC(r9)
lwz r5,(WTOM_CLOCK_SEC+LOPART)(r9)
lwz r6,WTOM_CLOCK_NSEC(r9)
/* We now have our offset in r5,r6. We create a fake dependency