[PATCH] ppc64: Store virtual address in TLB flush batches

This patch slightly change the TLB flush batch mecanism so that we
store the full vaddr (including vsid) when adding an entry to the
batch so that the flush part doesn't have to get to the context.

This cleans it a bit, and paves the way to future updates like
dynamic vsids.
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

arch/ppc64/kernel/pSeries_lpar.c

@@ -486,8 +486,7 @@ static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
  * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
  * lock.
  */
-void pSeries_lpar_flush_hash_range(unsigned long context, unsigned long number,
-				   int local)
+void pSeries_lpar_flush_hash_range(unsigned long number, int local)
 {
 	int i;
 	unsigned long flags = 0;
@@ -498,7 +497,7 @@ void pSeries_lpar_flush_hash_range(unsigned long context, unsigned long number,
 		spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
 
 	for (i = 0; i < number; i++)
-		flush_hash_page(context, batch->addr[i], batch->pte[i], local);
+		flush_hash_page(batch->vaddr[i], batch->pte[i], local);
 
 	if (lock_tlbie)
 		spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);

arch/ppc64/mm/hash_native.c

@@ -335,10 +335,9 @@ static void native_hpte_clear(void)
 	local_irq_restore(flags);
 }
 
-static void native_flush_hash_range(unsigned long context,
-				    unsigned long number, int local)
+static void native_flush_hash_range(unsigned long number, int local)
 {
-	unsigned long vsid, vpn, va, hash, secondary, slot, flags, avpn;
+	unsigned long va, vpn, hash, secondary, slot, flags, avpn;
 	int i, j;
 	hpte_t *hptep;
 	unsigned long hpte_v;
@@ -351,13 +350,7 @@ static void native_flush_hash_range(unsigned long context,
 
 	j = 0;
 	for (i = 0; i < number; i++) {
-		if (batch->addr[i] < KERNELBASE)
-			vsid = get_vsid(context, batch->addr[i]);
-		else
-			vsid = get_kernel_vsid(batch->addr[i]);
-
-		va = (vsid << 28) | (batch->addr[i] & 0x0fffffff);
-		batch->vaddr[j] = va;
+		va = batch->vaddr[j];
 		if (large)
 			vpn = va >> HPAGE_SHIFT;
 		else

arch/ppc64/mm/hash_utils.c

@@ -355,18 +355,11 @@ int hash_page(unsigned long ea, unsigned long access, unsigned long trap)
 	return ret;
 }
 
-void flush_hash_page(unsigned long context, unsigned long ea, pte_t pte,
-		     int local)
+void flush_hash_page(unsigned long va, pte_t pte, int local)
 {
-	unsigned long vsid, vpn, va, hash, secondary, slot;
+	unsigned long vpn, hash, secondary, slot;
 	unsigned long huge = pte_huge(pte);
 
-	if (ea < KERNELBASE)
-		vsid = get_vsid(context, ea);
-	else
-		vsid = get_kernel_vsid(ea);
-
-	va = (vsid << 28) | (ea & 0x0fffffff);
 	if (huge)
 		vpn = va >> HPAGE_SHIFT;
 	else
@@ -381,17 +374,17 @@ void flush_hash_page(unsigned long context, unsigned long ea, pte_t pte,
 	ppc_md.hpte_invalidate(slot, va, huge, local);
 }
 
-void flush_hash_range(unsigned long context, unsigned long number, int local)
+void flush_hash_range(unsigned long number, int local)
 {
 	if (ppc_md.flush_hash_range) {
-		ppc_md.flush_hash_range(context, number, local);
+		ppc_md.flush_hash_range(number, local);
 	} else {
 		int i;
-		struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
+		struct ppc64_tlb_batch *batch =
+			&__get_cpu_var(ppc64_tlb_batch);
 
 		for (i = 0; i < number; i++)
-			flush_hash_page(context, batch->addr[i], batch->pte[i],
-					local);
+			flush_hash_page(batch->vaddr[i], batch->pte[i], local);
 	}
 }
 

arch/ppc64/mm/tlb.c

@@ -128,12 +128,10 @@ void pgtable_free_tlb(struct mmu_gather *tlb, pgtable_free_t pgf)
 void hpte_update(struct mm_struct *mm, unsigned long addr,
 		 unsigned long pte, int wrprot)
 {
-	int i;
-	unsigned long context = 0;
 	struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
+	unsigned long vsid;
+	int i;
 
-	if (REGION_ID(addr) == USER_REGION_ID)
-		context = mm->context.id;
 	i = batch->index;
 
 	/*
@@ -143,17 +141,19 @@ void hpte_update(struct mm_struct *mm, unsigned long addr,
 	 * up scanning and resetting referenced bits then our batch context
 	 * will change mid stream.
 	 */
-	if (unlikely(i != 0 && context != batch->context)) {
+	if (unlikely(i != 0 && mm != batch->mm)) {
 		flush_tlb_pending();
 		i = 0;
 	}
-
-	if (i == 0) {
-		batch->context = context;
+	if (i == 0)
 		batch->mm = mm;
-	}
+	if (addr < KERNELBASE) {
+		vsid = get_vsid(mm->context.id, addr);
+		WARN_ON(vsid == 0);
+	} else
+		vsid = get_kernel_vsid(addr);
+	batch->vaddr[i] = (vsid << 28 ) | (addr & 0x0fffffff);
 	batch->pte[i] = __pte(pte);
-	batch->addr[i] = addr;
 	batch->index = ++i;
 	if (i >= PPC64_TLB_BATCH_NR)
 		flush_tlb_pending();
@@ -175,10 +175,9 @@ void __flush_tlb_pending(struct ppc64_tlb_batch *batch)
 		local = 1;
 
 	if (i == 1)
-		flush_hash_page(batch->context, batch->addr[0], batch->pte[0],
-				local);
+		flush_hash_page(batch->vaddr[0], batch->pte[0], local);
 	else
-		flush_hash_range(batch->context, i, local);
+		flush_hash_range(i, local);
 	batch->index = 0;
 	put_cpu();
 }

include/asm-ppc64/machdep.h

@@ -56,9 +56,8 @@ struct machdep_calls {
 				       unsigned long vflags,
 				       unsigned long rflags);
 	long		(*hpte_remove)(unsigned long hpte_group);
-	void		(*flush_hash_range)(unsigned long context,
-					    unsigned long number,
-					    int local);
+	void		(*flush_hash_range)(unsigned long number, int local);
+
 	/* special for kexec, to be called in real mode, linar mapping is
 	 * destroyed as well */
 	void		(*hpte_clear_all)(void);

include/asm-ppc64/tlbflush.h

@@ -20,10 +20,8 @@
 struct mm_struct;
 struct ppc64_tlb_batch {
 	unsigned long index;
-	unsigned long context;
 	struct mm_struct *mm;
 	pte_t pte[PPC64_TLB_BATCH_NR];
-	unsigned long addr[PPC64_TLB_BATCH_NR];
 	unsigned long vaddr[PPC64_TLB_BATCH_NR];
 };
 DECLARE_PER_CPU(struct ppc64_tlb_batch, ppc64_tlb_batch);
@@ -47,8 +45,7 @@ static inline void flush_tlb_pending(void)
 #define flush_tlb_kernel_range(start, end)	flush_tlb_pending()
 #define flush_tlb_pgtables(mm, start, end)	do { } while (0)
 
-extern void flush_hash_page(unsigned long context, unsigned long ea, pte_t pte,
-			    int local);
-void flush_hash_range(unsigned long context, unsigned long number, int local);
+extern void flush_hash_page(unsigned long va, pte_t pte, int local);
+void flush_hash_range(unsigned long number, int local);
 
 #endif /* _PPC64_TLBFLUSH_H */