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| author | Jonathan Currier <dullfire@yahoo.com> | 2025-09-06 22:50:14 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-09-09 19:56:29 +0300 |
| commit | b088ae4e41845d0a93c0acf072e72eca4df20085 (patch) | |
| tree | 7b07945f0d5f31d9a31d5df5bfde47cb624a9eea /include | |
| parent | 30d201ee3a37eff7d96471d1295c021ea36750d4 (diff) | |
| download | linux-b088ae4e41845d0a93c0acf072e72eca4df20085.tar.xz | |
PCI/MSI: Add an option to write MSIX ENTRY_DATA before any reads
[ Upstream commit cf761e3dacc6ad5f65a4886d00da1f9681e6805a ]
Commit 7d5ec3d36123 ("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: 7d5ec3d36123 ("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
[ Adjust context ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/pci.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/pci.h b/include/linux/pci.h index ac5bd1718af2..0511f6f9a4e6 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -245,6 +245,8 @@ enum pci_dev_flags { PCI_DEV_FLAGS_NO_RELAXED_ORDERING = (__force pci_dev_flags_t) (1 << 11), /* Device does honor MSI masking despite saying otherwise */ PCI_DEV_FLAGS_HAS_MSI_MASKING = (__force pci_dev_flags_t) (1 << 12), + /* Device requires write to PCI_MSIX_ENTRY_DATA before any MSIX reads */ + PCI_DEV_FLAGS_MSIX_TOUCH_ENTRY_DATA_FIRST = (__force pci_dev_flags_t) (1 << 13), }; enum pci_irq_reroute_variant { |