Merge samba.org:/scratch/anton/linux-2.5

into samba.org:/scratch/anton/tmp3

arch/ppc64/boot/Makefile

@@ -98,7 +98,7 @@ $(call gz-sec, $(required)): $(obj)/kernel-%.gz: % FORCE
 $(obj)/kernel-initrd.gz: $(obj)/ramdisk.image.gz
 	cp -f $(obj)/ramdisk.image.gz $@
 
-$(call src-sec, $(required) $(initrd)): $(obj)/kernel-%.c: $(obj)/kernel-%.gz
+$(call src-sec, $(required) $(initrd)): $(obj)/kernel-%.c: $(obj)/kernel-%.gz FORCE
 	touch $@
 
 $(call obj-sec, $(required) $(initrd)): $(obj)/kernel-%.o: $(obj)/kernel-%.c FORCE

arch/ppc64/kernel/head.S

@@ -1106,9 +1106,11 @@ SLB_NUM_ENTRIES = 64
 	oris    r21,r23,2048   /* valid bit    */
 	rldimi  r21,r22,0,52   /* Insert entry */
 
-	isync
+	/* 
+	 * No need for an isync before or after this slbmte. The exception
+	 * we enter with and the rfid we exit with are context synchronizing .
+	 */
 	slbmte  r20,r21
-	isync
 
 	/* All done -- return from exception. */
 	mfsprg  r20,3                   /* Load the PACA pointer  */

arch/ppc64/kernel/pci_dma.c

@@ -710,12 +710,6 @@ void create_tce_tables_for_busesLP(struct list_head *bus_list)
 	for (ln=bus_list->next; ln != bus_list; ln=ln->next) {
 		bus = pci_bus_b(ln);
 		busdn = PCI_GET_DN(bus);
-		/* NOTE: there should never be a window declared on a bus when
-		 * child devices also have a window.  If this should ever be
-		 * architected, we probably want children to have priority.
-		 * In reality, the PHB containing ISA has the property, but otherwise
-		 * it is the pci-bridges that have the property.
-		 */
 		dma_window = (u32 *)get_property(busdn, "ibm,dma-window", 0);
 		if (dma_window) {
 			/* Bussubno hasn't been copied yet.
@@ -724,6 +718,7 @@ void create_tce_tables_for_busesLP(struct list_head *bus_list)
 			busdn->bussubno = bus->number;
 			create_pci_bus_tce_table((unsigned long)busdn);
 		}
+		/* look for a window on a bridge even if the PHB had one */
 		create_tce_tables_for_busesLP(&bus->children);
 	}
 }

arch/ppc64/kernel/stab.c

@@ -23,7 +23,8 @@
 #include <asm/pmc.h>
 
 int make_ste(unsigned long stab, unsigned long esid, unsigned long vsid);
-void make_slbe(unsigned long esid, unsigned long vsid, int large);
+void make_slbe(unsigned long esid, unsigned long vsid, int large,
+	       int kernel_segment);
 
 /*
  * Build an entry for the base kernel segment and put it into
@@ -45,7 +46,8 @@ void stab_initialize(unsigned long stab)
 		asm volatile("isync":::"memory");
 		asm volatile("slbmte  %0,%0"::"r" (0) : "memory");
 		asm volatile("isync; slbia; isync":::"memory");
-		make_slbe(esid, vsid, 0);
+		make_slbe(esid, vsid, 0, 1);
+		asm volatile("isync":::"memory");
 #endif
 	} else {
 		asm volatile("isync; slbia; isync":::"memory");
@@ -139,10 +141,13 @@ int make_ste(unsigned long stab, unsigned long esid, unsigned long vsid)
 
 /*
  * Create a segment buffer entry for the given esid/vsid pair.
+ *
+ * NOTE: A context syncronising instruction is required before and after
+ * this, in the common case we use exception entry and rfid.
  */
-void make_slbe(unsigned long esid, unsigned long vsid, int large)
+void make_slbe(unsigned long esid, unsigned long vsid, int large,
+	       int kernel_segment)
 {
-	int kernel_segment = 0;
 	unsigned long entry, castout_entry;
 	union {
 		unsigned long word0;
@@ -153,42 +158,15 @@ void make_slbe(unsigned long esid, unsigned long vsid, int large)
 		slb_dword1    data;
 	} vsid_data;
 
-	if (REGION_ID(esid << SID_SHIFT) >= KERNEL_REGION_ID)
-		kernel_segment = 1;
-
 	/*
-	 * Find an empty entry, if one exists.
+	 * Find an empty entry, if one exists. Must start at 0 because
+	 * we use this code to load SLB entry 0 at boot.
 	 */
 	for (entry = 0; entry < naca->slb_size; entry++) {
 		asm volatile("slbmfee  %0,%1" 
 			     : "=r" (esid_data) : "r" (entry)); 
-		if (!esid_data.data.v) {
-			/* 
-			 * Write the new SLB entry.
-			 */
-			vsid_data.word0 = 0;
-			vsid_data.data.vsid = vsid;
-			vsid_data.data.kp = 1;
-			if (large)
-				vsid_data.data.l = 1;
-			if (kernel_segment)
-				vsid_data.data.c = 1;
-
-			esid_data.word0 = 0;
-			esid_data.data.esid = esid;
-			esid_data.data.v = 1;
-			esid_data.data.index = entry;
-
-			/* slbie not needed as no previous mapping existed. */
-			/* Order update  */
-			asm volatile("isync" : : : "memory");
-			asm volatile("slbmte  %0,%1" 
-				     : : "r" (vsid_data), 
-				     "r" (esid_data)); 
-			/* Order update  */
-			asm volatile("isync" : : : "memory");
-			return;
-		}
+		if (!esid_data.data.v)
+			goto write_entry;
 	}
 
 	/*
@@ -211,13 +189,13 @@ void make_slbe(unsigned long esid, unsigned long vsid, int large)
 		if (castout_entry >= naca->slb_size)
 			castout_entry = 1; 
 		asm volatile("slbmfee  %0,%1" : "=r" (esid_data) : "r" (entry));
-	} while (esid_data.data.esid == GET_ESID((unsigned long)_get_SP()) &&
-			esid_data.data.v);
+	} while (esid_data.data.esid == GET_ESID((unsigned long)_get_SP()));
 
 	get_paca()->xStab_data.next_round_robin = castout_entry;
 
 	/* slbie not needed as the previous mapping is still valid. */
 
+write_entry:	
 	/* 
 	 * Write the new SLB entry.
 	 */
@@ -234,10 +212,11 @@ void make_slbe(unsigned long esid, unsigned long vsid, int large)
 	esid_data.data.v = 1;
 	esid_data.data.index = entry;
 
-	asm volatile("isync" : : : "memory");   /* Order update */
-	asm volatile("slbmte  %0,%1" 
-		     : : "r" (vsid_data), "r" (esid_data)); 
-	asm volatile("isync" : : : "memory" );   /* Order update */
+	/*
+	 * No need for an isync before or after this slbmte. The exception
+         * we enter with and the rfid we exit with are context synchronizing.
+	 */
+	asm volatile("slbmte  %0,%1" : : "r" (vsid_data), "r" (esid_data)); 
 }
 
 static inline void __ste_allocate(unsigned long esid, unsigned long vsid,
@@ -246,10 +225,10 @@ static inline void __ste_allocate(unsigned long esid, unsigned long vsid,
 	if (cpu_has_slb()) {
 #ifndef CONFIG_PPC_ISERIES
 		if (REGION_ID(esid << SID_SHIFT) == KERNEL_REGION_ID)
-			make_slbe(esid, vsid, 1); 
+			make_slbe(esid, vsid, 1, kernel_segment); 
 		else
 #endif
-			make_slbe(esid, vsid, 0); 
+			make_slbe(esid, vsid, 0, kernel_segment);
 	} else {
 		unsigned char top_entry, stab_entry, *segments;