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authorMarc Zyngier <marc.zyngier@arm.com>2015-03-27 15:15:02 +0100
committerJason Cooper <jason@lakedaemon.net>2015-03-29 21:25:45 +0200
commit263fcd312deffb9bf10f007f958dccfa64a807f5 (patch)
treec424529594bcb4798dc802860e67fbd0f6600d78 /drivers
parentirqchip: gicv3-its: Support safe initialization (diff)
downloadlinux-263fcd312deffb9bf10f007f958dccfa64a807f5.tar.xz
linux-263fcd312deffb9bf10f007f958dccfa64a807f5.zip
irqchip: gicv3-its: Fix encoding of collection's target redistributor
With a monolithic GICv3, redistributors are addressed using a linear number, while a distributed implementation uses physical addresses. When encoding a target address into a command, we strip the lower 16 bits, as redistributors are always 64kB aligned. This works perfectly well with a distributed implementation, but has the silly effect of always encoding target 0 in the monolithic case (unless you have more than 64k CPUs, of course). The obvious fix is to shift the linear target number by 16 when computing the target address, so that we don't loose any precious bit. Reported-by: Andre Przywara <andre.przywara@arm.com> Tested-by: Andre Przywara <andre.przywara@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Link: https://lkml.kernel.org/r/1427465705-17126-2-git-send-email-marc.zyngier@arm.com Signed-off-by: Jason Cooper <jason@lakedaemon.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/irqchip/irq-gic-v3-its.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 596b0a9eee99..7318dba11957 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -1026,7 +1026,7 @@ static void its_cpu_init_collection(void)
* This ITS wants a linear CPU number.
*/
target = readq_relaxed(gic_data_rdist_rd_base() + GICR_TYPER);
- target = GICR_TYPER_CPU_NUMBER(target);
+ target = GICR_TYPER_CPU_NUMBER(target) << 16;
}
/* Perform collection mapping */