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* [PATCH v2 1/2] PCI: iproc: Set affinity mask on MSI interrupts
@ 2020-07-31  3:39 Mark Tomlinson
  2020-07-31  3:39 ` [PATCH v2 2/2] PCI: Reduce warnings on possible RW1C corruption Mark Tomlinson
  0 siblings, 1 reply; 4+ messages in thread
From: Mark Tomlinson @ 2020-07-31  3:39 UTC (permalink / raw)
  To: ray.jui, helgaas, sbranden, f.fainelli, lorenzo.pieralisi, robh
  Cc: linux-pci, linux-kernel, Mark Tomlinson

The core interrupt code expects the irq_set_affinity call to update the
effective affinity for the interrupt. This was not being done, so update
iproc_msi_irq_set_affinity() to do so.

Fixes: 3bc2b2348835 ("PCI: iproc: Add iProc PCIe MSI support")
Signed-off-by: Mark Tomlinson <mark.tomlinson@alliedtelesis.co.nz>
---
changes in v2:
 - Patch 1/2 Added Fixes tag
 - Patch 2/2 Replace original change with change suggested by Bjorn
   Helgaas.

 drivers/pci/controller/pcie-iproc-msi.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/controller/pcie-iproc-msi.c b/drivers/pci/controller/pcie-iproc-msi.c
index 3176ad3ab0e5..908475d27e0e 100644
--- a/drivers/pci/controller/pcie-iproc-msi.c
+++ b/drivers/pci/controller/pcie-iproc-msi.c
@@ -209,15 +209,20 @@ static int iproc_msi_irq_set_affinity(struct irq_data *data,
 	struct iproc_msi *msi = irq_data_get_irq_chip_data(data);
 	int target_cpu = cpumask_first(mask);
 	int curr_cpu;
+	int ret;
 
 	curr_cpu = hwirq_to_cpu(msi, data->hwirq);
 	if (curr_cpu == target_cpu)
-		return IRQ_SET_MASK_OK_DONE;
+		ret = IRQ_SET_MASK_OK_DONE;
+	else {
+		/* steer MSI to the target CPU */
+		data->hwirq = hwirq_to_canonical_hwirq(msi, data->hwirq) + target_cpu;
+		ret = IRQ_SET_MASK_OK;
+	}
 
-	/* steer MSI to the target CPU */
-	data->hwirq = hwirq_to_canonical_hwirq(msi, data->hwirq) + target_cpu;
+	irq_data_update_effective_affinity(data, cpumask_of(target_cpu));
 
-	return IRQ_SET_MASK_OK;
+	return ret;
 }
 
 static void iproc_msi_irq_compose_msi_msg(struct irq_data *data,
-- 
2.28.0


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2020-07-31  3:39 [PATCH v2 1/2] PCI: iproc: Set affinity mask on MSI interrupts Mark Tomlinson
2020-07-31  3:39 ` [PATCH v2 2/2] PCI: Reduce warnings on possible RW1C corruption Mark Tomlinson
2020-07-31 15:32   ` Rob Herring
2020-08-03  3:42     ` Mark Tomlinson

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