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authorMarc Zyngier <maz@kernel.org>2021-11-04 21:01:29 +0300
committerThomas Gleixner <tglx@linutronix.de>2021-11-11 11:50:30 +0300
commit2226667a145db2e1f314d7f57fd644fe69863ab9 (patch)
tree757ddb554077da027df5e9b5664317b2c514ba51 /drivers/pci
parent9c8e9c9681a0f3f1ae90a90230d059c7a1dece5a (diff)
downloadlinux-2226667a145db2e1f314d7f57fd644fe69863ab9.tar.xz
PCI/MSI: Deal with devices lying about their MSI mask capability
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>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/msi.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 6da791022d2e..70433013897b 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -477,6 +477,9 @@ 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);