Commit 7fd72186 authored by Benjamin Herrenschmidt's avatar Benjamin Herrenschmidt Committed by Paul Mackerras
Browse files

[POWERPC] MPIC protected sources 



Some HW platforms, such as the new cell blades, requires some MPIC sources
to be left alone by the operating system. This implements support for
a "protected-sources" property in the mpic controller node containing a list
of source numbers to be protected against operating system interference.

For those interested in the gory details, the MPIC on the southbridge of
those blades has some of the processor outputs routed to the cell, and
at least one routed as a GPIO to the service processor. It will be used
in the GA product for routing some of the southbridge error interrupts
to the service processor which implements some of the RAS stuff, such
as checkstopping when fatal errors occurs before they can propagate.

Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: default avatarArnd Bergmann <arnd.bergmann@de.ibm.com>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent 34f329db

arch/powerpc/sysdev/mpic.c

+32 −0
Original line number Diff line number Diff line
@@ -877,6 +877,8 @@ 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]) {
@@ -1034,6 +1036,25 @@ 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) {

		unsigned int psize, 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 = alloc_bootmem(mapsize);

			BUG_ON(mpic->protected == NULL);

			memset(mpic->protected, 0, mapsize);

			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)];
@@ -1213,6 +1234,9 @@ 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),
@@ -1407,6 +1431,14 @@ unsigned int mpic_get_one_irq(struct mpic *mpic) 
			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);

}

include/asm-powerpc/mpic.h

+3 −0
Original line number Diff line number Diff line
@@ -296,6 +296,9 @@ struct mpic 
	unsigned int		dcr_base;

#endif



	/* Protected sources */

	unsigned long		*protected;



#ifdef CONFIG_MPIC_WEIRD

	/* Pointer to HW info array */

	u32			*hw_set;

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