The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-4.19.y git checkout FETCH_HEAD git cherry-pick -x db744ddd59be798c2627efbfc71f707f5a935a40 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2024022609-womanless-imprison-678c@gregkh' --subject-prefix 'PATCH 4.19.y' HEAD^..

Possible dependencies:

db744ddd59be ("PCI/MSI: Prevent MSI hardware interrupt number truncation") aa423ac4221a ("PCI/MSI: Split out irqdomain code") a01e09ef1237 ("PCI/MSI: Split out !IRQDOMAIN code") 54324c2f3d72 ("PCI/MSI: Split out CONFIG_PCI_MSI independent part") 288c81ce4be7 ("PCI/MSI: Move code into a separate directory") 29a03ada4a00 ("PCI/MSI: Cleanup include zoo") ae72f3156729 ("PCI/MSI: Make arch_restore_msi_irqs() less horrible.") e58f2259b91c ("genirq/msi, treewide: Use a named struct for PCI/MSI attributes") ade044a3d0f0 ("PCI/MSI: Remove msi_desc_to_pci_sysdata()") 9e8688c5f299 ("PCI/MSI: Make pci_msi_domain_write_msg() static") 29bbc35e29d9 ("PCI/MSI: Fix pci_irq_vector()/pci_irq_get_affinity()") c36e33e2f477 ("Merge tag 'irq-urgent-2021-11-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From db744ddd59be798c2627efbfc71f707f5a935a40 Mon Sep 17 00:00:00 2001 From: Vidya Sagar vidyas@nvidia.com Date: Mon, 15 Jan 2024 19:26:49 +0530 Subject: [PATCH] PCI/MSI: Prevent MSI hardware interrupt number truncation

While calculating the hardware interrupt number for a 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 return type of pci_domain_nr() which is 'int'. This for example is resulting in same hardware interrupt number for devices 0019:00:00.0 and 0039:00:00.0.

To address this cast the PCI domain number to 'irq_hw_number_t' before left shifting it to calculate the hardware interrupt number.

Please note that this fixes the issue only on 64-bit systems and doesn't change the behavior for 32-bit systems i.e. the 32-bit systems continue to have the issue. Since the issue surfaces only if there are too many PCIe controllers in the system which usually is the case in modern server systems and they don't tend to run 32-bit kernels.

Fixes: 3878eaefb89a ("PCI/MSI: Enhance core to support hierarchy irqdomain") Signed-off-by: Vidya Sagar vidyas@nvidia.com Signed-off-by: Thomas Gleixner tglx@linutronix.de Tested-by: Shanker Donthineni sdonthineni@nvidia.com Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20240115135649.708536-1-vidyas@nvidia.com

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,