From 1db3e890aed3ac39cded30d6e94618bda086f7ce Mon Sep 17 00:00:00 2001 From: Michael Ellerman Date: Tue, 23 Oct 2007 14:23:44 +1000 Subject: [PATCH] [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: Michael Ellerman Acked-by: Linas Vepstas Signed-off-by: Paul Mackerras --- arch/powerpc/platforms/pseries/msi.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/powerpc/platforms/pseries/msi.c b/arch/powerpc/platforms/pseries/msi.c index 2793a1b100e6..f15222bbe136 100644 --- a/arch/powerpc/platforms/pseries/msi.c +++ b/arch/powerpc/platforms/pseries/msi.c @@ -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; + unmask_msi_irq(virq); } -- 2.20.1