[PATCH 03/11] PCI: OF: Check whether the host bridge supports ATS - Jean-Philippe Brucker

From: Jean-Philippe Brucker <jean-philippe@linaro.org>
To: bhelgaas@google.com, will@kernel.org, robh+dt@kernel.org,
	lorenzo.pieralisi@arm.com, joro@8bytes.org,
	baolu.lu@linux.intel.com, linux-doc@vger.kernel.org,
	linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	devicetree@vger.kernel.org, linux-acpi@vger.kernel.org,
	iommu@lists.linux-foundation.org
Cc: corbet@lwn.net, mark.rutland@arm.com, liviu.dudau@arm.com,
	sudeep.holla@arm.com, guohanjun@huawei.com, rjw@rjwysocki.net,
	lenb@kernel.org, robin.murphy@arm.com, dwmw2@infradead.org,
	amurray@thegoodpenguin.co.uk, frowand.list@gmail.com
Subject: [PATCH 03/11] PCI: OF: Check whether the host bridge supports ATS
Date: Thu, 13 Feb 2020 17:50:41 +0100	[thread overview]
Message-ID: <20200213165049.508908-4-jean-philippe@linaro.org> (raw)
In-Reply-To: <20200213165049.508908-1-jean-philippe@linaro.org>

Copy the ats-supported flag into the pci_host_bridge structure.

Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
---
 drivers/pci/controller/pci-host-common.c | 1 +
 drivers/pci/of.c                         | 9 +++++++++
 include/linux/of_pci.h                   | 3 +++
 3 files changed, 13 insertions(+)

diff --git a/drivers/pci/controller/pci-host-common.c b/drivers/pci/controller/pci-host-common.c
index 250a3fc80ec6..a6ac927be291 100644
--- a/drivers/pci/controller/pci-host-common.c
+++ b/drivers/pci/controller/pci-host-common.c
@@ -92,6 +92,7 @@ int pci_host_common_probe(struct platform_device *pdev,
 		return ret;
 	}
 
+	of_pci_host_check_ats(bridge);
 	platform_set_drvdata(pdev, bridge->bus);
 	return 0;
 }
diff --git a/drivers/pci/of.c b/drivers/pci/of.c
index 81ceeaa6f1d5..4b8a877f1e9f 100644
--- a/drivers/pci/of.c
+++ b/drivers/pci/of.c
@@ -576,6 +576,15 @@ int pci_parse_request_of_pci_ranges(struct device *dev,
 }
 EXPORT_SYMBOL_GPL(pci_parse_request_of_pci_ranges);
 
+void of_pci_host_check_ats(struct pci_host_bridge *bridge)
+{
+	struct device_node *np = bridge->bus->dev.of_node;
+
+	if (!np)
+		return;
+
+	bridge->ats_supported = of_property_read_bool(np, "ats-supported");
+}
 #endif /* CONFIG_PCI */
 
 /**
diff --git a/include/linux/of_pci.h b/include/linux/of_pci.h
index 29658c0ee71f..2d0af410438c 100644
--- a/include/linux/of_pci.h
+++ b/include/linux/of_pci.h
@@ -7,12 +7,14 @@
 
 struct pci_dev;
 struct device_node;
+struct pci_host_bridge;
 
 #if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_PCI)
 struct device_node *of_pci_find_child_device(struct device_node *parent,
 					     unsigned int devfn);
 int of_pci_get_devfn(struct device_node *np);
 void of_pci_check_probe_only(void);
+void of_pci_host_check_ats(struct pci_host_bridge *bridge);
 #else
 static inline struct device_node *of_pci_find_child_device(struct device_node *parent,
 					     unsigned int devfn)
@@ -26,6 +28,7 @@ static inline int of_pci_get_devfn(struct device_node *np)
 }
 
 static inline void of_pci_check_probe_only(void) { }
+static inline void of_pci_host_check_ats(struct pci_host_bridge *bridge) { }
 #endif
 
 #if IS_ENABLED(CONFIG_OF_IRQ)
-- 
2.25.0

