Commit 1467713e authored by David Christensen's avatar David Christensen Committed by Jakub Kicinski
Browse files

ionic: advertise 52-bit addressing limitation for MSI-X 



Current ionic devices only support 52 internal physical address
lines. This is sufficient for x86_64 systems which have similar
limitations but does not apply to all other architectures,
notably IBM POWER (ppc64). To ensure that MSI/MSI-X vectors are
not set outside the physical address limits of the NIC, set the
no_64bit_msi value of the pci_dev structure during device probe.

Signed-off-by: default avatarDavid Christensen <drc@linux.ibm.com>
Reviewed-by: default avatarShannon Nelson <shannon.nelson@amd.com>
Link: https://lore.kernel.org/r/20240603212747.1079134-1-drc@linux.ibm.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent c790275b

drivers/net/ethernet/pensando/ionic/ionic_bus_pci.c

+5 −0
Original line number Diff line number Diff line
@@ -326,6 +326,11 @@ static int ionic_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 
		goto err_out;

	}



#ifdef CONFIG_PPC64

	/* Ensure MSI/MSI-X interrupts lie within addressable physical memory */

	pdev->no_64bit_msi = 1;

#endif



	err = ionic_setup_one(ionic);

	if (err)

		goto err_out;