diff options
| author | Marc Zyngier <maz@kernel.org> | 2021-11-04 18:01:29 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-11-26 11:36:19 +0100 |
| commit | a632cb0b4013ff9ba8ce5f062a45e5652975a68b (patch) | |
| tree | 4972e2e1268fdc6dba673058a6d7abd70d77d6a9 | |
| parent | d8ea896354e3177316a24e2fd379785082d1a2fb (diff) | |
PCI/MSI: Deal with devices lying about their MSI mask capability
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>
| -rw-r--r-- | drivers/pci/msi.c | 3 | ||||
| -rw-r--r-- | include/linux/pci.h | 2 |
2 files changed, 5 insertions, 0 deletions
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index c824764f44ff..d42c84a2d2eb 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -569,6 +569,9 @@ msi_setup_entry(struct pci_dev *dev, int nvec, const 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 6f9ca2f278b3..a4bbce871e08 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -205,6 +205,8 @@ 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 { |