[SPARC64]: Fix new context version SMP handling.

Don't piggy back the SMP receive signal code to do the
context version change handling.

Instead allocate another fixed PIL number for this
asynchronous cross-call.  We can't use smp_call_function()
because this thing is invoked with interrupts disabled
and a few spinlocks held.

Also, fix smp_call_function_mask() to count "cpus" correctly.
There is no guarentee that the local cpu is in the mask
yet that is exactly what this code was assuming.

Signed-off-by: David S. Miller <davem@davemloft.net>

8 files changed, 55 insertions, 45 deletions

diff --git a/arch/sparc64/kernel/devices.c b/arch/sparc64/kernel/devices.c
index 1341b99ca7a..007e8922cd1 100644
--- a/arch/sparc64/kernel/devices.c
+++ b/arch/sparc64/kernel/devices.c
@@ -157,7 +157,7 @@ unsigned int sun4v_vdev_device_interrupt(unsigned int dev_node)
 		return 0;
 	}
 
-	return sun4v_build_irq(sun4v_vdev_devhandle, irq, 4, 0);
+	return sun4v_build_irq(sun4v_vdev_devhandle, irq, 5, 0);
 }
 
 static const char *cpu_mid_prop(void)
diff --git a/arch/sparc64/kernel/pci_psycho.c b/arch/sparc64/kernel/pci_psycho.c
index f7b16e49c28..d17878b145c 100644
--- a/arch/sparc64/kernel/pci_psycho.c
+++ b/arch/sparc64/kernel/pci_psycho.c
@@ -286,17 +286,17 @@ static unsigned char psycho_pil_table[] = {
 /*0x14*/0, 0, 0, 0,	/* PCI B slot 1  Int A, B, C, D */
 /*0x18*/0, 0, 0, 0,	/* PCI B slot 2  Int A, B, C, D */
 /*0x1c*/0, 0, 0, 0,	/* PCI B slot 3  Int A, B, C, D */
-/*0x20*/4,		/* SCSI				*/
+/*0x20*/5,		/* SCSI				*/
 /*0x21*/5,		/* Ethernet			*/
 /*0x22*/8,		/* Parallel Port		*/
 /*0x23*/13,		/* Audio Record			*/
 /*0x24*/14,		/* Audio Playback		*/
 /*0x25*/15,		/* PowerFail			*/
-/*0x26*/4,		/* second SCSI			*/
+/*0x26*/5,		/* second SCSI			*/
 /*0x27*/11,		/* Floppy			*/
-/*0x28*/4,		/* Spare Hardware		*/
+/*0x28*/5,		/* Spare Hardware		*/
 /*0x29*/9,		/* Keyboard			*/
-/*0x2a*/4,		/* Mouse			*/
+/*0x2a*/5,		/* Mouse			*/
 /*0x2b*/12,		/* Serial			*/
 /*0x2c*/10,		/* Timer 0			*/
 /*0x2d*/11,		/* Timer 1			*/
@@ -313,11 +313,11 @@ static int psycho_ino_to_pil(struct pci_dev *pdev, unsigned int ino)
 
 	ret = psycho_pil_table[ino];
 	if (ret == 0 && pdev == NULL) {
-		ret = 4;
+		ret = 5;
 	} else if (ret == 0) {
 		switch ((pdev->class >> 16) & 0xff) {
 		case PCI_BASE_CLASS_STORAGE:
-			ret = 4;
+			ret = 5;
 			break;
 
 		case PCI_BASE_CLASS_NETWORK:
@@ -336,7 +336,7 @@ static int psycho_ino_to_pil(struct pci_dev *pdev, unsigned int ino)
 			break;
 
 		default:
-			ret = 4;
+			ret = 5;
 			break;
 		};
 	}
diff --git a/arch/sparc64/kernel/pci_sabre.c b/arch/sparc64/kernel/pci_sabre.c
index 5ddc9293197..f67bb7f078c 100644
--- a/arch/sparc64/kernel/pci_sabre.c
+++ b/arch/sparc64/kernel/pci_sabre.c
@@ -533,17 +533,17 @@ static unsigned char sabre_pil_table[] = {
 /*0x14*/0, 0, 0, 0,	/* PCI B slot 1  Int A, B, C, D */
 /*0x18*/0, 0, 0, 0,	/* PCI B slot 2  Int A, B, C, D */
 /*0x1c*/0, 0, 0, 0,	/* PCI B slot 3  Int A, B, C, D */
-/*0x20*/4,		/* SCSI				*/
+/*0x20*/5,		/* SCSI				*/
 /*0x21*/5,		/* Ethernet			*/
 /*0x22*/8,		/* Parallel Port		*/
 /*0x23*/13,		/* Audio Record			*/
 /*0x24*/14,		/* Audio Playback		*/
 /*0x25*/15,		/* PowerFail			*/
-/*0x26*/4,		/* second SCSI			*/
+/*0x26*/5,		/* second SCSI			*/
 /*0x27*/11,		/* Floppy			*/
-/*0x28*/4,		/* Spare Hardware		*/
+/*0x28*/5,		/* Spare Hardware		*/
 /*0x29*/9,		/* Keyboard			*/
-/*0x2a*/4,		/* Mouse			*/
+/*0x2a*/5,		/* Mouse			*/
 /*0x2b*/12,		/* Serial			*/
 /*0x2c*/10,		/* Timer 0			*/
 /*0x2d*/11,		/* Timer 1			*/
@@ -565,11 +565,11 @@ static int sabre_ino_to_pil(struct pci_dev *pdev, unsigned int ino)
 
 	ret = sabre_pil_table[ino];
 	if (ret == 0 && pdev == NULL) {
-		ret = 4;
+		ret = 5;
 	} else if (ret == 0) {
 		switch ((pdev->class >> 16) & 0xff) {
 		case PCI_BASE_CLASS_STORAGE:
-			ret = 4;
+			ret = 5;
 			break;
 
 		case PCI_BASE_CLASS_NETWORK:
@@ -588,7 +588,7 @@ static int sabre_ino_to_pil(struct pci_dev *pdev, unsigned int ino)
 			break;
 
 		default:
-			ret = 4;
+			ret = 5;
 			break;
 		};
 	}
diff --git a/arch/sparc64/kernel/pci_schizo.c b/arch/sparc64/kernel/pci_schizo.c
index 3a89f29e27d..7fe4de03ac2 100644
--- a/arch/sparc64/kernel/pci_schizo.c
+++ b/arch/sparc64/kernel/pci_schizo.c
@@ -243,8 +243,8 @@ static unsigned char schizo_pil_table[] = {
 /*0x0c*/0, 0, 0, 0,	/* PCI slot 3  Int A, B, C, D	*/
 /*0x10*/0, 0, 0, 0,	/* PCI slot 4  Int A, B, C, D	*/
 /*0x14*/0, 0, 0, 0,	/* PCI slot 5  Int A, B, C, D	*/
-/*0x18*/4,		/* SCSI				*/
-/*0x19*/4,		/* second SCSI			*/
+/*0x18*/5,		/* SCSI				*/
+/*0x19*/5,		/* second SCSI			*/
 /*0x1a*/0,		/* UNKNOWN			*/
 /*0x1b*/0,		/* UNKNOWN			*/
 /*0x1c*/8,		/* Parallel			*/
@@ -254,7 +254,7 @@ static unsigned char schizo_pil_table[] = {
 /*0x20*/13,		/* Audio Record			*/
 /*0x21*/14,		/* Audio Playback		*/
 /*0x22*/12,		/* Serial			*/
-/*0x23*/4,		/* EBUS I2C 			*/
+/*0x23*/5,		/* EBUS I2C 			*/
 /*0x24*/10,		/* RTC Clock			*/
 /*0x25*/11,		/* Floppy			*/
 /*0x26*/0,		/* UNKNOWN			*/
@@ -296,11 +296,11 @@ static int schizo_ino_to_pil(struct pci_dev *pdev, unsigned int ino)
 
 	ret = schizo_pil_table[ino];
 	if (ret == 0 && pdev == NULL) {
-		ret = 4;
+		ret = 5;
 	} else if (ret == 0) {
 		switch ((pdev->class >> 16) & 0xff) {
 		case PCI_BASE_CLASS_STORAGE:
-			ret = 4;
+			ret = 5;
 			break;
 
 		case PCI_BASE_CLASS_NETWORK:
@@ -319,7 +319,7 @@ static int schizo_ino_to_pil(struct pci_dev *pdev, unsigned int ino)
 			break;
 
 		default:
-			ret = 4;
+			ret = 5;
 			break;
 		};
 	}
diff --git a/arch/sparc64/kernel/pci_sun4v.c b/arch/sparc64/kernel/pci_sun4v.c
index a9c44c0ae0a..9372d4f376d 100644
--- a/arch/sparc64/kernel/pci_sun4v.c
+++ b/arch/sparc64/kernel/pci_sun4v.c
@@ -735,11 +735,11 @@ static unsigned int pci_sun4v_irq_build(struct pci_pbm_info *pbm,
 	u32 devhandle = pbm->devhandle;
 	int pil;
 
-	pil = 4;
+	pil = 5;
 	if (pdev) {
 		switch ((pdev->class >> 16) & 0xff) {
 		case PCI_BASE_CLASS_STORAGE:
-			pil = 4;
+			pil = 5;
 			break;
 
 		case PCI_BASE_CLASS_NETWORK:
@@ -758,7 +758,7 @@ static unsigned int pci_sun4v_irq_build(struct pci_pbm_info *pbm,
 			break;
 
 		default:
-			pil = 4;
+			pil = 5;
 			break;
 		};
 	}
diff --git a/arch/sparc64/kernel/sbus.c b/arch/sparc64/kernel/sbus.c
index d95a1bcf163..1d6ffdeabd4 100644
--- a/arch/sparc64/kernel/sbus.c
+++ b/arch/sparc64/kernel/sbus.c
@@ -693,11 +693,11 @@ void sbus_set_sbus64(struct sbus_dev *sdev, int bursts)
 
 /* SBUS SYSIO INO number to Sparc PIL level. */
 static unsigned char sysio_ino_to_pil[] = {
-	0, 4, 4, 7, 5, 7, 8, 9,		/* SBUS slot 0 */
-	0, 4, 4, 7, 5, 7, 8, 9,		/* SBUS slot 1 */
-	0, 4, 4, 7, 5, 7, 8, 9,		/* SBUS slot 2 */
-	0, 4, 4, 7, 5, 7, 8, 9,		/* SBUS slot 3 */
-	4, /* Onboard SCSI */
+	0, 5, 5, 7, 5, 7, 8, 9,		/* SBUS slot 0 */
+	0, 5, 5, 7, 5, 7, 8, 9,		/* SBUS slot 1 */
+	0, 5, 5, 7, 5, 7, 8, 9,		/* SBUS slot 2 */
+	0, 5, 5, 7, 5, 7, 8, 9,		/* SBUS slot 3 */
+	5, /* Onboard SCSI */
 	5, /* Onboard Ethernet */
 /*XXX*/	8, /* Onboard BPP */
 	0, /* Bogon */
diff --git a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c
index c4548a88953..cf56128097c 100644
--- a/arch/sparc64/kernel/smp.c
+++ b/arch/sparc64/kernel/smp.c
@@ -760,12 +760,9 @@ static int smp_call_function_mask(void (*func)(void *info), void *info,
 				  int nonatomic, int wait, cpumask_t mask)
 {
 	struct call_data_struct data;
-	int cpus = cpus_weight(mask) - 1;
+	int cpus;
 	long timeout;
 
-	if (!cpus)
-		return 0;
-
 	/* Can deadlock when called with interrupts disabled */
 	WARN_ON(irqs_disabled());
 
@@ -776,6 +773,11 @@ static int smp_call_function_mask(void (*func)(void *info), void *info,
 
 	spin_lock(&call_lock);
 
+	cpu_clear(smp_processor_id(), mask);
+	cpus = cpus_weight(mask);
+	if (!cpus)
+		goto out_unlock;
+
 	call_data = &data;
 
 	smp_cross_call_masked(&xcall_call_function, 0, 0, 0, mask);
@@ -792,6 +794,7 @@ static int smp_call_function_mask(void (*func)(void *info), void *info,
 		udelay(1);
 	}
 
+out_unlock:
 	spin_unlock(&call_lock);
 
 	return 0;
@@ -845,6 +848,7 @@ extern unsigned long xcall_flush_tlb_pending;
 extern unsigned long xcall_flush_tlb_kernel_range;
 extern unsigned long xcall_report_regs;
 extern unsigned long xcall_receive_signal;
+extern unsigned long xcall_new_mmu_context_version;
 
 #ifdef DCACHE_ALIASING_POSSIBLE
 extern unsigned long xcall_flush_dcache_page_cheetah;
@@ -974,7 +978,13 @@ void smp_receive_signal(int cpu)
 
 void smp_receive_signal_client(int irq, struct pt_regs *regs)
 {
+	clear_softint(1 << irq);
+}
+
+void smp_new_mmu_context_version_client(int irq, struct pt_regs *regs)
+{
 	struct mm_struct *mm;
+	unsigned long flags;
 
 	clear_softint(1 << irq);
 
@@ -982,25 +992,24 @@ void smp_receive_signal_client(int irq, struct pt_regs *regs)
 	 * the version of the one we are using is now out of date.
 	 */
 	mm = current->active_mm;
-	if (likely(mm)) {
-		unsigned long flags;
+	if (unlikely(!mm || (mm == &init_mm)))
+		return;
 
-		spin_lock_irqsave(&mm->context.lock, flags);
+	spin_lock_irqsave(&mm->context.lock, flags);
 
-		if (unlikely(!CTX_VALID(mm->context)))
-			get_new_mmu_context(mm);
+	if (unlikely(!CTX_VALID(mm->context)))
+		get_new_mmu_context(mm);
 
-		load_secondary_context(mm);
-		__flush_tlb_mm(CTX_HWBITS(mm->context),
-			       SECONDARY_CONTEXT);
+	spin_unlock_irqrestore(&mm->context.lock, flags);
 
-		spin_unlock_irqrestore(&mm->context.lock, flags);
-	}
+	load_secondary_context(mm);
+	__flush_tlb_mm(CTX_HWBITS(mm->context),
+		       SECONDARY_CONTEXT);
 }
 
 void smp_new_mmu_context_version(void)
 {
-	__smp_receive_signal_mask(cpu_online_map);
+	smp_cross_call(&xcall_new_mmu_context_version, 0, 0, 0);
 }
 
 void smp_report_regs(void)
diff --git a/arch/sparc64/kernel/ttable.S b/arch/sparc64/kernel/ttable.S
index d5a8dd52d1f..5d901519db5 100644
--- a/arch/sparc64/kernel/ttable.S
+++ b/arch/sparc64/kernel/ttable.S
@@ -51,12 +51,13 @@ tl0_resv03e:	BTRAP(0x3e) BTRAP(0x3f) BTRAP(0x40)
 tl0_irq1:	TRAP_IRQ(smp_call_function_client, 1)
 tl0_irq2:	TRAP_IRQ(smp_receive_signal_client, 2)
 tl0_irq3:	TRAP_IRQ(smp_penguin_jailcell, 3)
+tl0_irq4:	TRAP_IRQ(smp_new_mmu_context_version_client, 4)
 #else
 tl0_irq1:	BTRAP(0x41)
 tl0_irq2:	BTRAP(0x42)
 tl0_irq3:	BTRAP(0x43)
+tl0_irq4:	BTRAP(0x44)
 #endif
-tl0_irq4:	TRAP_IRQ(handler_irq, 4)
 tl0_irq5:	TRAP_IRQ(handler_irq, 5)  TRAP_IRQ(handler_irq, 6)
 tl0_irq7:	TRAP_IRQ(handler_irq, 7)  TRAP_IRQ(handler_irq, 8)
 tl0_irq9:	TRAP_IRQ(handler_irq, 9)  TRAP_IRQ(handler_irq, 10)