Jonathan Currier cf761e3dac PCI/MSI: Add an option to write MSIX ENTRY_DATA before any reads ...

Commit 7d5ec3d361 ("PCI/MSI: Mask all unused MSI-X entries") introduced a
readl() from ENTRY_VECTOR_CTRL before the writel() to ENTRY_DATA.

This is correct, however some hardware, like the Sun Neptune chips, the NIU
module, will cause an error and/or fatal trap if any MSIX table entry is
read before the corresponding ENTRY_DATA field is written to.

Add an optional early writel() in msix_prepare_msi_desc().

Fixes: 7d5ec3d361 ("PCI/MSI: Mask all unused MSI-X entries")
Signed-off-by: Jonathan Currier <dullfire@yahoo.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/all/20241117234843.19236-2-dullfire@yahoo.com

2025-04-15 08:32:18 +02:00

..

api.c

Revert "Merge tag 'irq-msi-2025-03-23' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip"

2025-03-28 11:22:54 -07:00

irqdomain.c

PCI/MSI: Handle lack of irqdomain gracefully

2024-12-16 10:59:47 +01:00

legacy.c

PCI/MSI: Prevent UAF in error path

2022-01-21 02:14:46 +01:00

Makefile

PCI/MSI: Move pci_disable_msi() to api.c

2022-11-17 15:15:20 +01:00

msi.c

PCI/MSI: Add an option to write MSIX ENTRY_DATA before any reads

2025-04-15 08:32:18 +02:00

msi.h

PCI/MSI: Split MSI-X descriptor setup

2022-12-05 22:22:34 +01:00

pcidev_msi.c

…