6.6-stable review patch. If anyone has any objections, please let me know.
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From: Thomas Gleixner tglx@linutronix.de
commit a60b990798eb17433d0283788280422b1bd94b18 upstream.
Alexandre observed a warning emitted from pci_msi_setup_msi_irqs() on a RISCV platform which does not provide PCI/MSI support:
WARNING: CPU: 1 PID: 1 at drivers/pci/msi/msi.h:121 pci_msi_setup_msi_irqs+0x2c/0x32 __pci_enable_msix_range+0x30c/0x596 pci_msi_setup_msi_irqs+0x2c/0x32 pci_alloc_irq_vectors_affinity+0xb8/0xe2
RISCV uses hierarchical interrupt domains and correctly does not implement the legacy fallback. The warning triggers from the legacy fallback stub.
That warning is bogus as the PCI/MSI layer knows whether a PCI/MSI parent domain is associated with the device or not. There is a check for MSI-X, which has a legacy assumption. But that legacy fallback assumption is only valid when legacy support is enabled, but otherwise the check should simply return -ENOTSUPP.
Loongarch tripped over the same problem and blindly enabled legacy support without implementing the legacy fallbacks. There are weak implementations which return an error, so the problem was papered over.
Correct pci_msi_domain_supports() to evaluate the legacy mode and add the missing supported check into the MSI enable path to complete it.
Fixes: d2a463b29741 ("PCI/MSI: Reject multi-MSI early") Reported-by: Alexandre Ghiti alexghiti@rivosinc.com Signed-off-by: Thomas Gleixner tglx@linutronix.de Tested-by: Alexandre Ghiti alexghiti@rivosinc.com Cc: stable@vger.kernel.org Link: https://lore.kernel.org/all/87ed2a8ow5.ffs@tglx Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/pci/msi/irqdomain.c | 7 +++++-- drivers/pci/msi/msi.c | 4 ++++ 2 files changed, 9 insertions(+), 2 deletions(-)
--- a/drivers/pci/msi/irqdomain.c +++ b/drivers/pci/msi/irqdomain.c @@ -330,8 +330,11 @@ bool pci_msi_domain_supports(struct pci_
domain = dev_get_msi_domain(&pdev->dev);
- if (!domain || !irq_domain_is_hierarchy(domain)) - return mode == ALLOW_LEGACY; + if (!domain || !irq_domain_is_hierarchy(domain)) { + if (IS_ENABLED(CONFIG_PCI_MSI_ARCH_FALLBACKS)) + return mode == ALLOW_LEGACY; + return false; + }
if (!irq_domain_is_msi_parent(domain)) { /* --- a/drivers/pci/msi/msi.c +++ b/drivers/pci/msi/msi.c @@ -429,6 +429,10 @@ int __pci_enable_msi_range(struct pci_de if (WARN_ON_ONCE(dev->msi_enabled)) return -EINVAL;
+ /* Test for the availability of MSI support */ + if (!pci_msi_domain_supports(dev, 0, ALLOW_LEGACY)) + return -ENOTSUPP; + nvec = pci_msi_vec_count(dev); if (nvec < 0) return nvec;