[PATCH v3 1/4] powerpc: Removing support for 'protected-sources'

[Meador Inge]

In a recent thread [1,2,3] concerning device trees for AMP systems, the
question of whether we really need 'protected-sources' arose.  The general
consensus was that a new boolean property 'pic-no-reset' (described in more
detail in a following patch) could be expanded to cover the use cases that
'protected-sources' was covering.

One concern that was raised was for legacy systems which already use the
'protected-sources' property [4].  For legacy use cases, 'protected-sources'
will be treated as an alias of 'pic-no-reset'.  The sources
encoded in the 'protected-sources' cells, however, will not be processed.  This
legacy check is added in a later patch in the series.

[1] http://lists.ozlabs.org/pipermail/devicetree-discuss/2011-January/004038.html
[2] http://lists.ozlabs.org/pipermail/devicetree-discuss/2011-January/003991.html
[3] http://lists.ozlabs.org/pipermail/devicetree-discuss/2011-January/004043.html
[4] http://lists.ozlabs.org/pipermail/devicetree-discuss/2011-February/004254.html

Signed-off-by: Meador Inge <meador_inge at mentor.com>
Cc: Hollis Blanchard <hollis_blanchard at mentor.com>
Cc: Benjamin Herrenschmidt <benh at kernel.crashing.org>
---
 arch/powerpc/include/asm/mpic.h |    3 ---
 arch/powerpc/sysdev/mpic.c      |   38 --------------------------------------
 2 files changed, 0 insertions(+), 41 deletions(-)

diff --git a/arch/powerpc/include/asm/mpic.h b/arch/powerpc/include/asm/mpic.h
index e000cce..9b94f18 100644
--- a/arch/powerpc/include/asm/mpic.h
+++ b/arch/powerpc/include/asm/mpic.h
@@ -301,9 +301,6 @@ struct mpic
 	struct mpic_reg_bank	cpuregs[MPIC_MAX_CPUS];
 	struct mpic_reg_bank	isus[MPIC_MAX_ISU];
 
-	/* Protected sources */
-	unsigned long		*protected;
-
 #ifdef CONFIG_MPIC_WEIRD
 	/* Pointer to HW info array */
 	u32			*hw_set;
diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
index 7c13426..a98f41d 100644
--- a/arch/powerpc/sysdev/mpic.c
+++ b/arch/powerpc/sysdev/mpic.c
@@ -947,8 +947,6 @@ static int mpic_host_map(struct irq_host *h, unsigned int virq,
 
 	if (hw == mpic->spurious_vec)
 		return -EINVAL;
-	if (mpic->protected && test_bit(hw, mpic->protected))
-		return -EINVAL;
 
 #ifdef CONFIG_SMP
 	else if (hw >= mpic->ipi_vecs[0]) {
@@ -1095,26 +1093,6 @@ struct mpic * __init mpic_alloc(struct device_node *node,
 	if (node && of_get_property(node, "big-endian", NULL) != NULL)
 		mpic->flags |= MPIC_BIG_ENDIAN;
 
-	/* Look for protected sources */
-	if (node) {
-		int psize;
-		unsigned int bits, mapsize;
-		const u32 *psrc =
-			of_get_property(node, "protected-sources", &psize);
-		if (psrc) {
-			psize /= 4;
-			bits = intvec_top + 1;
-			mapsize = BITS_TO_LONGS(bits) * sizeof(unsigned long);
-			mpic->protected = kzalloc(mapsize, GFP_KERNEL);
-			BUG_ON(mpic->protected == NULL);
-			for (i = 0; i < psize; i++) {
-				if (psrc[i] > intvec_top)
-					continue;
-				__set_bit(psrc[i], mpic->protected);
-			}
-		}
-	}
-
 #ifdef CONFIG_MPIC_WEIRD
 	mpic->hw_set = mpic_infos[MPIC_GET_REGSET(flags)];
 #endif
@@ -1321,9 +1299,6 @@ void __init mpic_init(struct mpic *mpic)
 		u32 vecpri = MPIC_VECPRI_MASK | i |
 			(8 << MPIC_VECPRI_PRIORITY_SHIFT);
 		
-		/* check if protected */
-		if (mpic->protected && test_bit(i, mpic->protected))
-			continue;
 		/* init hw */
 		mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
 		mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION), 1 << cpu);
@@ -1492,13 +1467,6 @@ static unsigned int _mpic_get_one_irq(struct mpic *mpic, int reg)
 			mpic_eoi(mpic);
 		return NO_IRQ;
 	}
-	if (unlikely(mpic->protected && test_bit(src, mpic->protected))) {
-		if (printk_ratelimit())
-			printk(KERN_WARNING "%s: Got protected source %d !\n",
-			       mpic->name, (int)src);
-		mpic_eoi(mpic);
-		return NO_IRQ;
-	}
 
 	return irq_linear_revmap(mpic->irqhost, src);
 }
@@ -1532,12 +1500,6 @@ unsigned int mpic_get_coreint_irq(void)
 			mpic_eoi(mpic);
 		return NO_IRQ;
 	}
-	if (unlikely(mpic->protected && test_bit(src, mpic->protected))) {
-		if (printk_ratelimit())
-			printk(KERN_WARNING "%s: Got protected source %d !\n",
-			       mpic->name, (int)src);
-		return NO_IRQ;
-	}
 
 	return irq_linear_revmap(mpic->irqhost, src);
 #else
-- 
1.6.3.3