linux-kernel - [PATCH V4 8/8] PCI: ACPI: Add support for PCI device DMA coherency

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 21 Oct 2015 08:52:11 -0700
From:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
To:	<bhelgaas@...gle.com>, <rjw@...ysocki.net>, <lenb@...nel.org>,
	<catalin.marinas@....com>, <will.deacon@....com>
CC:	<hanjun.guo@...aro.org>, <thomas.lendacky@....com>,
	<herbert@...dor.apana.org.au>, <davem@...emloft.net>,
	<linux-acpi@...r.kernel.org>, <linux-pci@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Murali Karicheri <m-karicheri2@...com>
Subject: [PATCH V4 8/8] PCI: ACPI: Add support for PCI device DMA coherency

This patch adds support for setting up PCI device DMA coherency from
ACPI _CCA object that should normally be specified in the DSDT node
of its PCI host bridge.

Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
CC: Bjorn Helgaas <bhelgaas@...gle.com>
CC: Catalin Marinas <catalin.marinas@....com>
CC: Rob Herring <robh+dt@...nel.org>
CC: Will Deacon <will.deacon@....com>
CC: Rafael J. Wysocki <rjw@...ysocki.net>
CC: Murali Karicheri <m-karicheri2@...com>
---
 drivers/pci/probe.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 09264f8..6e9f7e6 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1642,17 +1642,26 @@ static void pci_set_msi_domain(struct pci_dev *dev)
  * @dev: ptr to pci_dev struct of the PCI device
  *
  * Function to update PCI devices's DMA configuration using the same
- * info from the OF node of host bridge's parent (if any).
+ * info from the OF node or ACPI node of host bridge's parent (if any).
  */
 static void pci_dma_configure(struct pci_dev *dev)
 {
 	struct device *bridge = pci_get_host_bridge_device(dev);
 
 	if (IS_ENABLED(CONFIG_OF) && dev->dev.of_node) {
-		if (!bridge->parent)
-			return;
-
-		of_dma_configure(&dev->dev, bridge->parent->of_node);
+		if (bridge->parent)
+			of_dma_configure(&dev->dev,
+					 bridge->parent->of_node);
+	} else if (has_acpi_companion(bridge)) {
+		struct acpi_device *adev = to_acpi_node(bridge->fwnode);
+		enum dev_dma_attr attr = acpi_get_dma_attr(adev);
+
+		if (attr != DEV_DMA_NOT_SUPPORTED)
+			arch_setup_dma_ops(&dev->dev, 0, 0, NULL,
+					   attr == DEV_DMA_COHERENT);
+		else
+			WARN(1, FW_BUG "PCI device %s fail to setup DMA.\n",
+			     pci_name(dev));
 	}
 
 	pci_put_host_bridge_device(bridge);
-- 
2.1.0

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/