linux-kernel - [PATCH 1/2, pci] pci: Addition of PCI_DEV_FLAGS_QUIET_PCI

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Date:   Wed, 14 Mar 2018 13:34:54 -0300
From:   "Desnes A. Nunes do Rosario" <desnesn@...ux.vnet.ibm.com>
To:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Cc:     bhelgaas@...gle.com, benh@...nel.crashing.org, paulus@...ba.org,
        mpe@...erman.id.au, ruscur@...sell.cc, aik@...abs.ru,
        david@...son.dropbear.id.au, fbarrat@...ux.vnet.ibm.com,
        brking@...ux.vnet.ibm.com
Subject: [PATCH 1/2, pci] pci: Addition of PCI_DEV_FLAGS_QUIET_PCI_REALIGN attribute to the PCI subsystem

Add PCI_DEV_FLAGS_QUIET_PCI_REALIGN to pci_dev_flags and use it to
silent PCI realignment messages if the flag is turned on by a driver.

Signed-off-by: Desnes A. Nunes do Rosario <desnesn@...ux.vnet.ibm.com>
---
 drivers/pci/pci.c       | 3 ++-
 drivers/pci/setup-res.c | 3 ++-
 include/linux/pci.h     | 2 ++
 3 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 8c71d1a66cdd..be197c944e5f 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -5505,7 +5505,8 @@ void pci_reassigndev_resource_alignment(struct pci_dev *dev)
 		return;
 	}
 
-	pci_info(dev, "Disabling memory decoding and releasing memory resources\n");
+	if (!(dev->dev_flags & PCI_DEV_FLAGS_QUIET_PCI_REALIGN))
+		pci_info(dev, "Disabling memory decoding and releasing memory resources\n");
 	pci_read_config_word(dev, PCI_COMMAND, &command);
 	command &= ~PCI_COMMAND_MEMORY;
 	pci_write_config_word(dev, PCI_COMMAND, command);
diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index 369d48d6c6f1..00a538def763 100644
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -172,7 +172,8 @@ EXPORT_SYMBOL(pci_claim_resource);
 
 void pci_disable_bridge_window(struct pci_dev *dev)
 {
-	pci_info(dev, "disabling bridge mem windows\n");
+	if (!(dev->dev_flags & PCI_DEV_FLAGS_QUIET_PCI_REALIGN))
+		pci_info(dev, "disabling bridge mem windows\n");
 
 	/* MMIO Base/Limit */
 	pci_write_config_dword(dev, PCI_MEMORY_BASE, 0x0000fff0);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index e057e8cc63e7..993f9c7dcc00 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -205,6 +205,8 @@ enum pci_dev_flags {
 	PCI_DEV_FLAGS_NO_FLR_RESET = (__force pci_dev_flags_t) (1 << 10),
 	/* Don't use Relaxed Ordering for TLPs directed at this device */
 	PCI_DEV_FLAGS_NO_RELAXED_ORDERING = (__force pci_dev_flags_t) (1 << 11),
+	/* Silent PCI resource realignment messages */
+	PCI_DEV_FLAGS_QUIET_PCI_REALIGN = (__force pci_dev_flags_t) (1 << 12),
 };
 
 enum pci_irq_reroute_variant {
-- 
2.14.3