Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc

* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: (151 commits)
  powerpc: Fix usage of 64-bit instruction in 32-bit altivec code
  MAINTAINERS: Add PowerPC patterns
  powerpc/pseries: Track previous CPPR values to correctly EOI interrupts
  powerpc/pseries: Correct pseries/dlpar.c build break without CONFIG_SMP
  powerpc: Make "intspec" pointers in irq_host->xlate() const
  powerpc/8xx: DTLB Miss cleanup
  powerpc/8xx: Remove DIRTY pte handling in DTLB Error.
  powerpc/8xx: Start using dcbX instructions in various copy routines
  powerpc/8xx: Restore _PAGE_WRITETHRU
  powerpc/8xx: Add missing Guarded setting in DTLB Error.
  powerpc/8xx: Fixup DAR from buggy dcbX instructions.
  powerpc/8xx: Tag DAR with 0x00f0 to catch buggy instructions.
  powerpc/8xx: Update TLB asm so it behaves as linux mm expects.
  powerpc/8xx: Invalidate non present TLBs
  powerpc/pseries: Serialize cpu hotplug operations during deactivate Vs deallocate
  pseries/pseries: Add code to online/offline CPUs of a DLPAR node
  powerpc: stop_this_cpu: remove the cpu from the online map.
  powerpc/pseries: Add kernel based CPU DLPAR handling
  sysfs/cpu: Add probe/release files
  powerpc/pseries: Kernel DLPAR Infrastructure
  ...

1 files changed, 58 insertions, 12 deletions

diff --git a/arch/powerpc/platforms/pseries/xics.c b/arch/powerpc/platforms/pseries/xics.c
index b9bf0eedccf..7d01b58f398 100644
--- a/arch/powerpc/platforms/pseries/xics.c
+++ b/arch/powerpc/platforms/pseries/xics.c
@@ -20,6 +20,7 @@
 #include <linux/cpu.h>
 #include <linux/msi.h>
 #include <linux/of.h>
+#include <linux/percpu.h>
 
 #include <asm/firmware.h>
 #include <asm/io.h>
@@ -46,6 +47,12 @@ static struct irq_host *xics_host;
  */
 #define IPI_PRIORITY		4
 
+/* The least favored priority */
+#define LOWEST_PRIORITY		0xFF
+
+/* The number of priorities defined above */
+#define MAX_NUM_PRIORITIES	3
+
 static unsigned int default_server = 0xFF;
 static unsigned int default_distrib_server = 0;
 static unsigned int interrupt_server_size = 8;
@@ -56,6 +63,12 @@ static int ibm_set_xive;
 static int ibm_int_on;
 static int ibm_int_off;
 
+struct xics_cppr {
+	unsigned char stack[MAX_NUM_PRIORITIES];
+	int index;
+};
+
+static DEFINE_PER_CPU(struct xics_cppr, xics_cppr);
 
 /* Direct hardware low level accessors */
 
@@ -157,7 +170,7 @@ static int get_irq_server(unsigned int virq, unsigned int strict_check)
 	cpumask_t cpumask;
 	cpumask_t tmp = CPU_MASK_NONE;
 
-	cpumask_copy(&cpumask, irq_desc[virq].affinity);
+	cpumask_copy(&cpumask, irq_to_desc(virq)->affinity);
 	if (!distribute_irqs)
 		return default_server;
 
@@ -284,6 +297,19 @@ static inline unsigned int xics_xirr_vector(unsigned int xirr)
 	return xirr & 0x00ffffff;
 }
 
+static void push_cppr(unsigned int vec)
+{
+	struct xics_cppr *os_cppr = &__get_cpu_var(xics_cppr);
+
+	if (WARN_ON(os_cppr->index >= MAX_NUM_PRIORITIES - 1))
+		return;
+
+	if (vec == XICS_IPI)
+		os_cppr->stack[++os_cppr->index] = IPI_PRIORITY;
+	else
+		os_cppr->stack[++os_cppr->index] = DEFAULT_PRIORITY;
+}
+
 static unsigned int xics_get_irq_direct(void)
 {
 	unsigned int xirr = direct_xirr_info_get();
@@ -294,8 +320,10 @@ static unsigned int xics_get_irq_direct(void)
 		return NO_IRQ;
 
 	irq = irq_radix_revmap_lookup(xics_host, vec);
-	if (likely(irq != NO_IRQ))
+	if (likely(irq != NO_IRQ)) {
+		push_cppr(vec);
 		return irq;
+	}
 
 	/* We don't have a linux mapping, so have rtas mask it. */
 	xics_mask_unknown_vec(vec);
@@ -315,8 +343,10 @@ static unsigned int xics_get_irq_lpar(void)
 		return NO_IRQ;
 
 	irq = irq_radix_revmap_lookup(xics_host, vec);
-	if (likely(irq != NO_IRQ))
+	if (likely(irq != NO_IRQ)) {
+		push_cppr(vec);
 		return irq;
+	}
 
 	/* We don't have a linux mapping, so have RTAS mask it. */
 	xics_mask_unknown_vec(vec);
@@ -326,12 +356,22 @@ static unsigned int xics_get_irq_lpar(void)
 	return NO_IRQ;
 }
 
+static unsigned char pop_cppr(void)
+{
+	struct xics_cppr *os_cppr = &__get_cpu_var(xics_cppr);
+
+	if (WARN_ON(os_cppr->index < 1))
+		return LOWEST_PRIORITY;
+
+	return os_cppr->stack[--os_cppr->index];
+}
+
 static void xics_eoi_direct(unsigned int virq)
 {
 	unsigned int irq = (unsigned int)irq_map[virq].hwirq;
 
 	iosync();
-	direct_xirr_info_set((0xff << 24) | irq);
+	direct_xirr_info_set((pop_cppr() << 24) | irq);
 }
 
 static void xics_eoi_lpar(unsigned int virq)
@@ -339,7 +379,7 @@ static void xics_eoi_lpar(unsigned int virq)
 	unsigned int irq = (unsigned int)irq_map[virq].hwirq;
 
 	iosync();
-	lpar_xirr_info_set((0xff << 24) | irq);
+	lpar_xirr_info_set((pop_cppr() << 24) | irq);
 }
 
 static int xics_set_affinity(unsigned int virq, const struct cpumask *cpumask)
@@ -388,7 +428,7 @@ static int xics_set_affinity(unsigned int virq, const struct cpumask *cpumask)
 }
 
 static struct irq_chip xics_pic_direct = {
-	.typename = " XICS     ",
+	.name = " XICS     ",
 	.startup = xics_startup,
 	.mask = xics_mask_irq,
 	.unmask = xics_unmask_irq,
@@ -397,7 +437,7 @@ static struct irq_chip xics_pic_direct = {
 };
 
 static struct irq_chip xics_pic_lpar = {
-	.typename = " XICS     ",
+	.name = " XICS     ",
 	.startup = xics_startup,
 	.mask = xics_mask_irq,
 	.unmask = xics_unmask_irq,
@@ -428,13 +468,13 @@ static int xics_host_map(struct irq_host *h, unsigned int virq,
 	/* Insert the interrupt mapping into the radix tree for fast lookup */
 	irq_radix_revmap_insert(xics_host, virq, hw);
 
-	get_irq_desc(virq)->status |= IRQ_LEVEL;
+	irq_to_desc(virq)->status |= IRQ_LEVEL;
 	set_irq_chip_and_handler(virq, xics_irq_chip, handle_fasteoi_irq);
 	return 0;
 }
 
 static int xics_host_xlate(struct irq_host *h, struct device_node *ct,
-			   u32 *intspec, unsigned int intsize,
+			   const u32 *intspec, unsigned int intsize,
 			   irq_hw_number_t *out_hwirq, unsigned int *out_flags)
 
 {
@@ -746,6 +786,12 @@ void __init xics_init_IRQ(void)
 
 static void xics_set_cpu_priority(unsigned char cppr)
 {
+	struct xics_cppr *os_cppr = &__get_cpu_var(xics_cppr);
+
+	BUG_ON(os_cppr->index != 0);
+
+	os_cppr->stack[os_cppr->index] = cppr;
+
 	if (firmware_has_feature(FW_FEATURE_LPAR))
 		lpar_cppr_info(cppr);
 	else
@@ -772,7 +818,7 @@ static void xics_set_cpu_giq(unsigned int gserver, unsigned int join)
 
 void xics_setup_cpu(void)
 {
-	xics_set_cpu_priority(0xff);
+	xics_set_cpu_priority(LOWEST_PRIORITY);
 
 	xics_set_cpu_giq(default_distrib_server, 1);
 }
@@ -852,7 +898,7 @@ void xics_migrate_irqs_away(void)
 		/* We need to get IPIs still. */
 		if (irq == XICS_IPI || irq == XICS_IRQ_SPURIOUS)
 			continue;
-		desc = get_irq_desc(virq);
+		desc = irq_to_desc(virq);
 
 		/* We only need to migrate enabled IRQS */
 		if (desc == NULL || desc->chip == NULL
@@ -881,7 +927,7 @@ void xics_migrate_irqs_away(void)
 		       virq, cpu);
 
 		/* Reset affinity to all cpus */
-		cpumask_setall(irq_desc[virq].affinity);
+		cpumask_setall(irq_to_desc(virq)->affinity);
 		desc->chip->set_affinity(virq, cpu_all_mask);
 unlock:
 		spin_unlock_irqrestore(&desc->lock, flags);