From 18c55aed17b2d9b34c8b4946bc7eeb0a51ce8d10 Mon Sep 17 00:00:00 2001
From: Marc Zyngier <maz@kernel.org>
Date: Thu, 4 Nov 2021 18:01:29 +0000
Subject: [PATCH] PCI/MSI: Deal with devices lying about their MSI mask capability
Git-commit: 2226667a145db2e1f314d7f57fd644fe69863ab9
Patch-mainline: v5.16-rc1
References: stable-5.14.21
commit 2226667a145db2e1f314d7f57fd644fe69863ab9 upstream.
It appears that some devices are lying about their mask capability,
pretending that they don't have it, while they actually do.
The net result is that now that we don't enable MSIs on such
endpoint.
Add a new per-device flag to deal with this. Further patches will
make use of it, sadly.
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20211104180130.3825416-2-maz@kernel.org
Cc: Bjorn Helgaas <helgaas@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/pci/msi.c | 3 +++
include/linux/pci.h | 2 ++
2 files changed, 5 insertions(+)
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 30bec2482e27..da5fbfcda433 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -585,6 +585,9 @@ msi_setup_entry(struct pci_dev *dev, int nvec, struct irq_affinity *affd)
goto out;
pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control);
+ /* Lies, damned lies, and MSIs */
+ if (dev->dev_flags & PCI_DEV_FLAGS_HAS_MSI_MASKING)
+ control |= PCI_MSI_FLAGS_MASKBIT;
entry->msi_attrib.is_msix = 0;
entry->msi_attrib.is_64 = !!(control & PCI_MSI_FLAGS_64BIT);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index acbed2ecf6e8..25acd447c922 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -227,6 +227,8 @@ enum pci_dev_flags {
PCI_DEV_FLAGS_NO_FLR_RESET = (__force pci_dev_flags_t) (1 << 10),
/* Don't use Relaxed Ordering for TLPs directed at this device */
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),
};
enum pci_irq_reroute_variant {
--
2.26.2