linux-kernel - [PATCH V1] PCI/MSI: Fix MSI hwirq truncation

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Date: Fri, 5 Jan 2024 19:13:39 +0530
From: Vidya Sagar <vidyas@...dia.com>
To: <bhelgaas@...gle.com>, <rdunlap@...radead.org>,
	<ilpo.jarvinen@...ux.intel.com>, <tglx@...utronix.de>
CC: <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<treding@...dia.com>, <jonathanh@...dia.com>, <sdonthineni@...dia.com>,
	<kthota@...dia.com>, <mmaddireddy@...dia.com>, <vidyas@...dia.com>,
	<sagar.tv@...il.com>
Subject: [PATCH V1] PCI/MSI: Fix MSI hwirq truncation

While calculating the hwirq number for an MSI interrupt, the higher
bits (i.e. from bit-5 onwards a.k.a domain_nr >= 32) of the PCI domain
number gets truncated because of the shifted value casting to u32. This
for example is resulting in same hwirq number for devices 0019:00:00.0
and 0039:00:00.0.

So, cast the PCI domain number to u64 before left shifting it to
calculate hwirq number.

Signed-off-by: Vidya Sagar <vidyas@...dia.com>
---
 drivers/pci/msi/irqdomain.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/msi/irqdomain.c b/drivers/pci/msi/irqdomain.c
index c8be056c248d..cfd84a899c82 100644
--- a/drivers/pci/msi/irqdomain.c
+++ b/drivers/pci/msi/irqdomain.c
@@ -61,7 +61,7 @@ static irq_hw_number_t pci_msi_domain_calc_hwirq(struct msi_desc *desc)
 
 	return (irq_hw_number_t)desc->msi_index |
 		pci_dev_id(dev) << 11 |
-		(pci_domain_nr(dev->bus) & 0xFFFFFFFF) << 27;
+		((irq_hw_number_t)(pci_domain_nr(dev->bus) & 0xFFFFFFFF)) << 27;
 }
 
 static void pci_msi_domain_set_desc(msi_alloc_info_t *arg,
-- 
2.25.1