Commit 1db3e890 authored by Michael Ellerman's avatar Michael Ellerman Committed by Paul Mackerras
Browse files

[POWERPC] Read back MSI message in rtas_setup_msi_irqs() so restore works

There are plans afoot to use pci_restore_msi_state() to restore MSI
state after a device reset.  In order for this to work for the RTAS MSI
backend, we need to read back the MSI message from config space after
it has been setup by firmware.

This should be sufficient for restoring the MSI state after a device
reset, however we will need to revisit this for suspend to disk if that
is ever implemented on pseries.
Signed-off-by: default avatarMichael Ellerman <>
Acked-by: default avatarLinas Vepstas <>
Signed-off-by: default avatarPaul Mackerras <>
parent bdd71eec
......@@ -171,6 +171,7 @@ static int rtas_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
struct pci_dn *pdn;
int hwirq, virq, i, rc;
struct msi_desc *entry;
struct msi_msg msg;
pdn = get_pdn(pdev);
if (!pdn)
......@@ -213,6 +214,11 @@ static int rtas_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
dev_dbg(&pdev->dev, "rtas_msi: allocated virq %d\n", virq);
set_irq_msi(virq, entry);
/* Read config space back so we can restore after reset */
read_msi_msg(virq, &msg);
entry->msg = msg;
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment