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Message-ID: <alpine.DEB.2.21.2302051459210.33812@angie.orcam.me.uk>
Date: Sun, 5 Feb 2023 15:49:21 +0000 (GMT)
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 v6 6/7] PCI: pciehp: 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 PPC64LE and x86-64
configurations.
New change in v6.
---
drivers/pci/hotplug/pciehp_hpc.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)
linux-pcie-link-active-reporting-hpc.diff
Index: linux-macro/drivers/pci/hotplug/pciehp_hpc.c
===================================================================
--- linux-macro.orig/drivers/pci/hotplug/pciehp_hpc.c
+++ linux-macro/drivers/pci/hotplug/pciehp_hpc.c
@@ -984,7 +984,7 @@ static inline int pcie_hotplug_depth(str
struct controller *pcie_init(struct pcie_device *dev)
{
struct controller *ctrl;
- u32 slot_cap, slot_cap2, link_cap;
+ u32 slot_cap, slot_cap2;
u8 poweron;
struct pci_dev *pdev = dev->port;
struct pci_bus *subordinate = pdev->subordinate;
@@ -1030,9 +1030,6 @@ struct controller *pcie_init(struct pcie
if (dmi_first_match(inband_presence_disabled_dmi_table))
ctrl->inband_presence_disabled = 1;
- /* Check if Data Link Layer Link Active Reporting is implemented */
- pcie_capability_read_dword(pdev, PCI_EXP_LNKCAP, &link_cap);
-
/* Clear all remaining event bits in Slot Status register. */
pcie_capability_write_word(pdev, PCI_EXP_SLTSTA,
PCI_EXP_SLTSTA_ABP | PCI_EXP_SLTSTA_PFD |
@@ -1051,7 +1048,7 @@ struct controller *pcie_init(struct pcie
FLAG(slot_cap, PCI_EXP_SLTCAP_EIP),
FLAG(slot_cap, PCI_EXP_SLTCAP_NCCS),
FLAG(slot_cap2, PCI_EXP_SLTCAP2_IBPD),
- FLAG(link_cap, PCI_EXP_LNKCAP_DLLLARC),
+ FLAG(pdev->link_active_reporting, true),
pdev->broken_cmd_compl ? " (with Cmd Compl erratum)" : "");
/*
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