Commit 94ee4272 authored by Nicholas Piggin's avatar Nicholas Piggin Committed by Michael Ellerman
Browse files

powerpc/64s/hash: Simplify slb_flush_and_rebolt() 



slb_flush_and_rebolt() is misleading, it is called in virtual mode, so
it can not possibly change the stack, so it should not be touching the
shadow area. And since vmalloc is no longer bolted, it should not
change any bolted mappings at all.

Change the name to slb_flush_and_restore_bolted(), and have it just
load the kernel stack from what's currently in the shadow SLB area.

Signed-off-by: default avatarNicholas Piggin <npiggin@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 5434ae74

arch/powerpc/include/asm/book3s/64/mmu-hash.h

+1 −1
Original line number Diff line number Diff line
@@ -503,7 +503,7 @@ struct slb_entry { 
};



extern void slb_initialize(void);

extern void slb_flush_and_rebolt(void);

void slb_flush_and_restore_bolted(void);

void slb_flush_all_realmode(void);

void __slb_restore_bolted_realmode(void);

void slb_restore_bolted_realmode(void);

arch/powerpc/kernel/swsusp_asm64.S

+1 −1
Original line number Diff line number Diff line
@@ -262,7 +262,7 @@ END_FW_FTR_SECTION_IFCLR(FW_FEATURE_LPAR) 


	addi	r1,r1,-128

#ifdef CONFIG_PPC_BOOK3S_64

	bl	slb_flush_and_rebolt

	bl	slb_flush_and_restore_bolted

#endif

	bl	do_after_copyback

	addi	r1,r1,128

arch/powerpc/mm/hash_utils_64.c

+2 −2
Original line number Diff line number Diff line
@@ -1125,7 +1125,7 @@ void demote_segment_4k(struct mm_struct *mm, unsigned long addr) 
	if ((get_paca_psize(addr) != MMU_PAGE_4K) && (current->mm == mm)) {



		copy_mm_to_paca(mm);

		slb_flush_and_rebolt();

		slb_flush_and_restore_bolted();

	}

}

#endif /* CONFIG_PPC_64K_PAGES */
@@ -1197,7 +1197,7 @@ static void check_paca_psize(unsigned long ea, struct mm_struct *mm, 
	if (user_region) {

		if (psize != get_paca_psize(ea)) {

			copy_mm_to_paca(mm);

			slb_flush_and_rebolt();

			slb_flush_and_restore_bolted();

		}

	} else if (get_paca()->vmalloc_sllp !=

		   mmu_psize_defs[mmu_vmalloc_psize].sllp) {

arch/powerpc/mm/slb.c

+16 −30
Original line number Diff line number Diff line
@@ -115,8 +115,6 @@ void __slb_restore_bolted_realmode(void) 


/*

 * Insert the bolted entries into an empty SLB.

 * This is not the same as rebolt because the bolted segments are not

 * changed, just loaded from the shadow area.

 */

void slb_restore_bolted_realmode(void)

{
@@ -135,12 +133,15 @@ void slb_flush_all_realmode(void) 
	asm volatile("slbmte %0,%0; slbia" : : "r" (0));

}



void slb_flush_and_rebolt(void)

/*

 * This flushes non-bolted entries, it can be run in virtual mode. Must

 * be called with interrupts disabled.

 */

void slb_flush_and_restore_bolted(void)

{

	/* If you change this make sure you change SLB_NUM_BOLTED

	 * and PR KVM appropriately too. */

	unsigned long linear_llp, lflags;

	unsigned long ksp_esid_data, ksp_vsid_data;

	struct slb_shadow *p = get_slb_shadow();



	BUILD_BUG_ON(SLB_NUM_BOLTED != 2);



	WARN_ON(!irqs_disabled());
@@ -150,30 +151,12 @@ void slb_flush_and_rebolt(void) 
	 */

	hard_irq_disable();



	linear_llp = mmu_psize_defs[mmu_linear_psize].sllp;

	lflags = SLB_VSID_KERNEL | linear_llp;



	ksp_esid_data = mk_esid_data(get_paca()->kstack, mmu_kernel_ssize, KSTACK_INDEX);

	if ((ksp_esid_data & ~0xfffffffUL) <= PAGE_OFFSET) {

		ksp_esid_data &= ~SLB_ESID_V;

		ksp_vsid_data = 0;

		slb_shadow_clear(KSTACK_INDEX);

	} else {

		/* Update stack entry; others don't change */

		slb_shadow_update(get_paca()->kstack, mmu_kernel_ssize, lflags, KSTACK_INDEX);

		ksp_vsid_data =

			be64_to_cpu(get_slb_shadow()->save_area[KSTACK_INDEX].vsid);

	}



	/* We need to do this all in asm, so we're sure we don't touch

	 * the stack between the slbia and rebolting it. */

	asm volatile("isync\n"

		     "slbia\n"

		     /* Slot 1 - kernel stack */

		     "slbmte  %0, %1\n"

		     "isync"

		     :: "r"(ksp_vsid_data),

		        "r"(ksp_esid_data)

		     "isync\n"

		     :: "r" (be64_to_cpu(p->save_area[KSTACK_INDEX].vsid)),

			"r" (be64_to_cpu(p->save_area[KSTACK_INDEX].esid))

		     : "memory");



	get_paca()->slb_cache_ptr = 0;
@@ -254,7 +237,10 @@ void slb_dump_contents(struct slb_entry *slb_ptr) 


void slb_vmalloc_update(void)

{

	slb_flush_and_rebolt();

	/*

	 * vmalloc is not bolted, so just have to flush non-bolted.

	 */

	slb_flush_and_restore_bolted();

}



static bool preload_hit(struct thread_info *ti, unsigned long esid)

arch/powerpc/mm/slice.c

+1 −1
Original line number Diff line number Diff line
@@ -219,7 +219,7 @@ static void slice_flush_segments(void *parm) 
	copy_mm_to_paca(current->active_mm);



	local_irq_save(flags);

	slb_flush_and_rebolt();

	slb_flush_and_restore_bolted();

	local_irq_restore(flags);

#endif

}

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