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From: Marc Zyngier <maz@kernel.org>
To: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
	Bjorn Helgaas <bhelgaas@google.com>
Cc: linux-hyperv@vger.kernel.org, linux-pci@vger.kernel.org,
	Thierry Reding <thierry.reding@gmail.com>,
	"K. Y. Srinivasan" <kys@microsoft.com>,
	Will Deacon <will@kernel.org>,
	Marek Vasut <marek.vasut+renesas@gmail.com>,
	Rob Herring <robh@kernel.org>, Wei Liu <wei.liu@kernel.org>,
	Ryder Lee <ryder.lee@mediatek.com>,
	Stephen Hemminger <sthemmin@microsoft.com>,
	Michal Simek <michal.simek@xilinx.com>,
	Jonathan Hunter <jonathanh@nvidia.com>,
	Thierry Reding <treding@nvidia.com>,
	Frank Wunderlich <frank-w@public-files.de>,
	Haiyang Zhang <haiyangz@microsoft.com>,
	linux-mediatek@lists.infradead.org,
	Paul Walmsley <paul.walmsley@sifive.com>,
	linux-tegra@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>,
	linux-arm-kernel@lists.infradead.org,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
	linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org
Subject: [PATCH 08/13] PCI: MSI: Let PCI host bridges declare their lack of MSI handling
Date: Thu, 25 Feb 2021 15:10:18 +0000
Message-ID: <20210225151023.3642391-9-maz@kernel.org> (raw)
In-Reply-To: <20210225151023.3642391-1-maz@kernel.org>

From: Thomas Gleixner <tglx@linutronix.de>

Some PCI host bridges cannot deal with MSIs at all. This has
the unfortunate effect of triggering ugly warnings when an end-point
driver requests MSIs.

Instead, let the bridge advertise such lack of MSIs, so that it
can be flagged correctly by the core code.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
[maz: commit message]
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 drivers/pci/probe.c | 2 ++
 include/linux/pci.h | 1 +
 2 files changed, 3 insertions(+)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index fb04fc81a8bd..146bd85c037e 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -925,6 +925,8 @@ static int pci_register_host_bridge(struct pci_host_bridge *bridge)
 	device_enable_async_suspend(bus->bridge);
 	pci_set_bus_of_node(bus);
 	pci_set_bus_msi_domain(bus);
+	if (bridge->no_msi)
+		bus->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
 
 	if (!parent)
 		set_dev_node(bus->bridge, pcibus_to_node(bus));
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 105ef1a5191e..9db3abf9fd90 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -550,6 +550,7 @@ struct pci_host_bridge {
 	unsigned int	native_dpc:1;		/* OS may use PCIe DPC */
 	unsigned int	preserve_config:1;	/* Preserve FW resource setup */
 	unsigned int	size_windows:1;		/* Enable root bus sizing */
+	unsigned int	no_msi:1;		/* Bridge has no MSI support */
 
 	/* Resource alignment requirements */
 	resource_size_t (*align_resource)(struct pci_dev *dev,
-- 
2.29.2


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  parent reply index

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-25 15:10 [PATCH 00/13] PCI: MSI: Getting rid of msi_controller, and other cleanups Marc Zyngier
2021-02-25 15:10 ` [PATCH 01/13] PCI: tegra: Convert to MSI domains Marc Zyngier
2021-02-25 15:10 ` [PATCH 02/13] PCI: rcar: " Marc Zyngier
2021-02-28 18:48   ` Marek Vasut
2021-02-25 15:10 ` [PATCH 03/13] PCI: xilinx: " Marc Zyngier
2021-03-22 12:21   ` Lorenzo Pieralisi
2021-03-22 12:33     ` Michal Simek
2021-03-22 14:04       ` Marc Zyngier
2021-03-22 12:23   ` Lorenzo Pieralisi
2021-03-22 12:33     ` Michal Simek
2021-03-22 14:04     ` Marc Zyngier
2021-02-25 15:10 ` [PATCH 04/13] PCI: hyperv: Drop msi_controller structure Marc Zyngier
2021-03-01  4:24   ` Michael Kelley
2021-02-25 15:10 ` [PATCH 05/13] PCI: MSI: Drop use of msi_controller from core code Marc Zyngier
2021-02-25 15:10 ` [PATCH 06/13] PCI: MSI: Kill msi_controller structure Marc Zyngier
2021-02-25 15:10 ` [PATCH 07/13] PCI: MSI: Kill default_teardown_msi_irqs() Marc Zyngier
2021-02-25 15:10 ` Marc Zyngier [this message]
2021-02-25 15:10 ` [PATCH 09/13] PCI: mediatek: Advertise lack of MSI handling Marc Zyngier
2021-03-01 10:43   ` Aw: " Frank Wunderlich
2021-03-01 11:49     ` Marc Zyngier
2021-03-01 12:16       ` Aw: " Frank Wunderlich
2021-03-01 13:31         ` Marc Zyngier
2021-03-01 14:06           ` Aw: " Frank Wunderlich
2021-03-02 10:35             ` Robin Murphy
2021-02-25 15:10 ` [PATCH 10/13] PCI: MSI: Let PCI host bridges declare their reliance on MSI domains Marc Zyngier
2021-02-25 15:10 ` [PATCH 11/13] PCI: Make pci_host_common_probe() declare its " Marc Zyngier
2021-02-25 15:10 ` [PATCH 12/13] PCI: MSI: Document the various ways of ending up with NO_MSI Marc Zyngier
2021-02-25 15:10 ` [PATCH 13/13] PCI: quirks: Refactor advertising of the NO_MSI flag Marc Zyngier
2021-03-10 19:29 ` [PATCH 00/13] PCI: MSI: Getting rid of msi_controller, and other cleanups Bjorn Helgaas

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