netdev - [PATCH v9 05/14] powerpc/eeh: Rely on `link_active

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Date: Sun, 11 Jun 2023 18:19:32 +0100 (BST)
From: "Maciej W. Rozycki" <macro@...am.me.uk>
To: Bjorn Helgaas <bhelgaas@...gle.com>, 
    Mahesh J Salgaonkar <mahesh@...ux.ibm.com>, 
    Oliver O'Halloran <oohall@...il.com>, 
    Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>, 
    Christophe Leroy <christophe.leroy@...roup.eu>, 
    Saeed Mahameed <saeedm@...dia.com>, Leon Romanovsky <leon@...nel.org>, 
    "David S. Miller" <davem@...emloft.net>, 
    Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
    Paolo Abeni <pabeni@...hat.com>
cc: Alex Williamson <alex.williamson@...hat.com>, 
    Lukas Wunner <lukas@...ner.de>, 
    Mika Westerberg <mika.westerberg@...ux.intel.com>, 
    Stefan Roese <sr@...x.de>, Jim Wilson <wilson@...iptree.org>, 
    David Abdurachmanov <david.abdurachmanov@...il.com>, 
    Pali Rohár <pali@...nel.org>, linux-pci@...r.kernel.org, 
    linuxppc-dev@...ts.ozlabs.org, linux-rdma@...r.kernel.org, 
    netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v9 05/14] powerpc/eeh: Rely on `link_active_reporting'

Use `link_active_reporting' to determine whether Data Link Layer Link 
Active Reporting is available rather than re-retrieving the capability.

Signed-off-by: Maciej W. Rozycki <macro@...am.me.uk>
---
NB this has been compile-tested only with a PPC64LE configuration.

No change from v8.

Changes from v7:

- Reorder from 4/7.

No change from v6.

New change in v6.
---
 arch/powerpc/kernel/eeh_pe.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

linux-pcie-link-active-reporting-eeh.diff
Index: linux-macro/arch/powerpc/kernel/eeh_pe.c
===================================================================
--- linux-macro.orig/arch/powerpc/kernel/eeh_pe.c
+++ linux-macro/arch/powerpc/kernel/eeh_pe.c
@@ -671,9 +671,8 @@ static void eeh_bridge_check_link(struct
 	eeh_ops->write_config(edev, cap + PCI_EXP_LNKCTL, 2, val);
 
 	/* Check link */
-	eeh_ops->read_config(edev, cap + PCI_EXP_LNKCAP, 4, &val);
-	if (!(val & PCI_EXP_LNKCAP_DLLLARC)) {
-		eeh_edev_dbg(edev, "No link reporting capability (0x%08x) \n", val);
+	if (!edev->pdev->link_active_reporting) {
+		eeh_edev_dbg(edev, "No link reporting capability\n");
 		msleep(1000);
 		return;
 	}