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PCI/MSI: Check the device specific address mask in msi_verify_entries()

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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 <wangruikang@iscas.ac.cn>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Reviewed-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260129-pci-msi-addr-mask-v4-2-70da998f2750@iscas.ac.cn
This commit is contained in:
Vivian Wang
2026-01-29 09:56:07 +08:00
committed by Thomas Gleixner
parent 386ced19e9
commit 52f0d862f5
1 changed files with 5 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/pci/msi/msi.c
View File

@@ -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;
}
}