diff options
| author | Marc Zyngier <maz@kernel.org> | 2021-11-04 21:01:29 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2021-11-11 11:50:30 +0300 |
| commit | 2226667a145db2e1f314d7f57fd644fe69863ab9 (patch) | |
| tree | 757ddb554077da027df5e9b5664317b2c514ba51 /drivers/pci | |
| parent | 9c8e9c9681a0f3f1ae90a90230d059c7a1dece5a (diff) | |
| download | linux-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.c | 3 |
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); |