Re: [PATCH 3/6] irqchip/gic-v3-its: Add fsl_mc device plumbing to the msi-parent handling

On Sun, 22 Feb 2026 22:57:44 +0000,
Thomas Gleixner [off-list ref] wrote:

On Wed, Feb 18 2026 at 13:52, Marc Zyngier wrote:

quoted

Make the ITS code aware of fsl_mc devices by plumbing the devid
retrieval primitive.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 drivers/irqchip/irq-gic-its-msi-parent.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/irqchip/irq-gic-its-msi-parent.c b/drivers/irqchip/irq-gic-its-msi-parent.c
index 12f45228c8674..532c0d626ca04 100644
--- a/drivers/irqchip/irq-gic-its-msi-parent.c
+++ b/drivers/irqchip/irq-gic-its-msi-parent.c

@@ -7,6 +7,7 @@
 #include <linux/acpi_iort.h>
 #include <linux/of_address.h>
 #include <linux/pci.h>
+#include <linux/fsl/mc.h>
 
 #include "irq-gic-its-msi-parent.h"
 #include <linux/irqchip/irq-msi-lib.h>

@@ -186,9 +187,11 @@ static int its_pmsi_prepare(struct irq_domain *domain, struct device *dev,
 {
 	struct msi_domain_info *msi_info;
 	u32 dev_id;
-	int ret;
+	int ret = 0;
 
-	if (dev->of_node)
+	if (dev_is_fsl_mc(dev))
+		dev_id = fsl_mc_get_msi_id(dev);
+	else if (dev->of_node)
 		ret = of_pmsi_get_msi_info(domain->parent, dev, &dev_id, NULL);
 	else
 		ret = iort_pmsi_get_dev_id(dev, &dev_id);

This rejects as you are building against an unmerged change (I assume
it's Lorenzos GIC5 stuff). I can fix it up when applying.

That was against vanilla 6.19. I'll rebase on -rc1 to satisfy myself
that this is still doing the right thing after the ACPI crap fest, and
repost the result.

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.