This is a note to let you know that I've just added the patch titled

irqchip/mips-gic: Separate IPI reservation & usage tracking

to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: irqchip-mips-gic-separate-ipi-reservation-usage-tracking.patch and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Thu Mar 22 14:40:23 CET 2018

From: Paul Burton paul.burton@imgtec.com Date: Thu, 20 Apr 2017 10:07:34 +0100 Subject: irqchip/mips-gic: Separate IPI reservation & usage tracking

From: Paul Burton paul.burton@imgtec.com

[ Upstream commit f8dcd9e81797ae24acc44c84f0eb3b9e6cee9791 ]

Since commit 2af70a962070 ("irqchip/mips-gic: Add a IPI hierarchy domain") introduced the GIC IPI IRQ domain we have tracked both reservation of interrupts & their use with a single bitmap - ipi_resrv. If an interrupt is reserved for use as an IPI but not actually in use then the appropriate bit is set in ipi_resrv. If an interrupt is either not reserved for use as an IPI or has been allocated as one then the appropriate bit is clear in ipi_resrv.

Unfortunately this means that checking whether a bit is set in ipi_resrv to prevent IPI interrupts being allocated for use with a device is broken, because if the interrupt has been allocated as an IPI first then its bit will be clear.

Fix this by separating the tracking of IPI reservation & usage, introducing a separate ipi_available bitmap for the latter. This means that ipi_resrv will now always have bits set corresponding to all interrupts reserved for use as IPIs, whether or not they have been allocated yet, and therefore that checking it when allocating device interrupts works as expected.

Fixes: 2af70a962070 ("irqchip/mips-gic: Add a IPI hierarchy domain") Signed-off-by: Paul Burton paul.burton@imgtec.com Signed-off-by: Matt Redfearn matt.redfearn@imgtec.com Cc: linux-mips@linux-mips.org Cc: Jason Cooper jason@lakedaemon.net Cc: Marc Zyngier marc.zyngier@arm.com Cc: Ralf Baechle ralf@linux-mips.org Link: http://lkml.kernel.org/r/1492679256-14513-2-git-send-email-matt.redfearn@img... Signed-off-by: Thomas Gleixner tglx@linutronix.de Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/irqchip/irq-mips-gic.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-)

--- a/drivers/irqchip/irq-mips-gic.c +++ b/drivers/irqchip/irq-mips-gic.c @@ -55,6 +55,7 @@ static unsigned int gic_cpu_pin; static unsigned int timer_cpu_pin; static struct irq_chip gic_level_irq_controller, gic_edge_irq_controller; DECLARE_BITMAP(ipi_resrv, GIC_MAX_INTRS); +DECLARE_BITMAP(ipi_available, GIC_MAX_INTRS);

static void __gic_irq_dispatch(void);

@@ -746,17 +747,17 @@ static int gic_irq_domain_alloc(struct i

return gic_setup_dev_chip(d, virq, spec->hwirq); } else { - base_hwirq = find_first_bit(ipi_resrv, gic_shared_intrs); + base_hwirq = find_first_bit(ipi_available, gic_shared_intrs); if (base_hwirq == gic_shared_intrs) { return -ENOMEM; }

/* check that we have enough space */ for (i = base_hwirq; i < nr_irqs; i++) { - if (!test_bit(i, ipi_resrv)) + if (!test_bit(i, ipi_available)) return -EBUSY; } - bitmap_clear(ipi_resrv, base_hwirq, nr_irqs); + bitmap_clear(ipi_available, base_hwirq, nr_irqs);

/* map the hwirq for each cpu consecutively */ i = 0; @@ -787,7 +788,7 @@ static int gic_irq_domain_alloc(struct i

return 0; error: - bitmap_set(ipi_resrv, base_hwirq, nr_irqs); + bitmap_set(ipi_available, base_hwirq, nr_irqs); return ret; }

@@ -802,7 +803,7 @@ void gic_irq_domain_free(struct irq_doma return;

base_hwirq = GIC_HWIRQ_TO_SHARED(irqd_to_hwirq(data)); - bitmap_set(ipi_resrv, base_hwirq, nr_irqs); + bitmap_set(ipi_available, base_hwirq, nr_irqs); }

int gic_irq_domain_match(struct irq_domain *d, struct device_node *node, @@ -1066,6 +1067,7 @@ static void __init __gic_init(unsigned l 2 * gic_vpes); }

+ bitmap_copy(ipi_available, ipi_resrv, GIC_MAX_INTRS); gic_basic_init(); }

Patches currently in stable-queue which might be from paul.burton@imgtec.com are

queue-4.9/irqchip-mips-gic-separate-ipi-reservation-usage-tracking.patch