From 52f0d862f595a2fa18ef44532619a080c24fe4cb Mon Sep 17 00:00:00 2001 From: Vivian Wang Date: Thu, 29 Jan 2026 09:56:07 +0800 Subject: [PATCH] PCI/MSI: Check the device specific address mask in msi_verify_entries() Instead of a 32-bit/64-bit dichotomy, check the MSI address against the device specific address mask. This allows platforms with an MSI doorbell address above the 32-bit limit to work with devices without full 64-bit MSI address support, as long as the doorbell is within the addressable range of the device. [ tglx: Massaged changelog ] Signed-off-by: Vivian Wang Signed-off-by: Thomas Gleixner Reviewed-by: Thomas Gleixner Link: https://patch.msgid.link/20260129-pci-msi-addr-mask-v4-2-70da998f2750@iscas.ac.cn --- drivers/pci/msi/msi.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/pci/msi/msi.c b/drivers/pci/msi/msi.c index fb9a42bec62eb..e2412175d7af2 100644 --- a/drivers/pci/msi/msi.c +++ b/drivers/pci/msi/msi.c @@ -321,14 +321,16 @@ static int msi_setup_msi_desc(struct pci_dev *dev, int nvec, static int msi_verify_entries(struct pci_dev *dev) { struct msi_desc *entry; + u64 address; if (dev->msi_addr_mask == DMA_BIT_MASK(64)) return 0; msi_for_each_desc(entry, &dev->dev, MSI_DESC_ALL) { - if (entry->msg.address_hi) { - pci_err(dev, "arch assigned 64-bit MSI address %#x%08x but device only supports 32 bits\n", - entry->msg.address_hi, entry->msg.address_lo); + address = (u64)entry->msg.address_hi << 32 | entry->msg.address_lo; + if (address & ~dev->msi_addr_mask) { + pci_err(dev, "arch assigned 64-bit MSI address %#llx above device MSI address mask %#llx\n", + address, dev->msi_addr_mask); break; } } -- 2.47.3