Re: [PATCH V5 8/9] PCI: OF: Move of_pci_dma_configure() to pci_dma_configure()

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi Suravee,

On 28/10/15 22:50, Suravee Suthikulpanit wrote:
This patch move of_pci_dma_configure() to a more generic
pci_dma_configure(), which can be extended by non-OF code (e.g. ACPI).

This has no functional change.

Unfortunately, it appears that it does...

Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
Acked-by: Rob Herring <robh+dt@xxxxxxxxxx>
Acked-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Reviewed-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
CC: Rafael J. Wysocki <rjw@xxxxxxxxxxxxx>
---
  drivers/of/of_pci.c    | 19 -------------------
  drivers/pci/probe.c    | 23 +++++++++++++++++++++--
  include/linux/of_pci.h |  3 ---
  3 files changed, 21 insertions(+), 24 deletions(-)

diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
index a2f510c..b66ee4e 100644
--- a/drivers/of/of_pci.c
+++ b/drivers/of/of_pci.c
@@ -117,25 +117,6 @@ int of_get_pci_domain_nr(struct device_node *node)
  }
  EXPORT_SYMBOL_GPL(of_get_pci_domain_nr);

-/**
- * of_pci_dma_configure - Setup DMA configuration
- * @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).
- */
-void of_pci_dma_configure(struct pci_dev *pci_dev)
-{
-	struct device *dev = &pci_dev->dev;
-	struct device *bridge = pci_get_host_bridge_device(pci_dev);
-
-	if (bridge->parent)
-		of_dma_configure(dev, bridge->parent->of_node);
-
-	pci_put_host_bridge_device(bridge);
-}
-EXPORT_SYMBOL_GPL(of_pci_dma_configure);
-
  #if defined(CONFIG_OF_ADDRESS)
  /**
   * of_pci_get_host_bridge_resources - Parse PCI host bridge resources from DT
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 8361d27..31e3eef 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -6,7 +6,7 @@
  #include <linux/delay.h>
  #include <linux/init.h>
  #include <linux/pci.h>
-#include <linux/of_pci.h>
+#include <linux/of_device.h>
  #include <linux/pci_hotplug.h>
  #include <linux/slab.h>
  #include <linux/module.h>
@@ -1633,6 +1633,25 @@ static void pci_set_msi_domain(struct pci_dev *dev)
  				   dev_get_msi_domain(&dev->bus->dev));
  }

+/**
+ * pci_dma_configure - Setup DMA configuration
+ * @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).
+ */
+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) {

Previously I was seeing of_dma_configure, and thus of_iommu_configure, called for every PCI device on Juno. The check above now prevents this happening, since the PCI devices are probed directly from the bus and don't have OF nodes of their own. They now get left in some half-configured state where arch_setup_dma_ops isn't called either.

Should this be checking bridge->parent->of_node rather than dev->dev.of_node (which seems to work), or am I missing something?

Sorry I don't really have the bandwidth to look into this in detail myself, right now I'm just trying to get my magic hacks rebased ;)

Robin.

+		if (bridge->parent)
+			of_dma_configure(&dev->dev, bridge->parent->of_node);
+	}
+
+	pci_put_host_bridge_device(bridge);
+}
+
  void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
  {
  	int ret;
@@ -1646,7 +1665,7 @@ void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
  	dev->dev.dma_mask = &dev->dma_mask;
  	dev->dev.dma_parms = &dev->dma_parms;
  	dev->dev.coherent_dma_mask = 0xffffffffull;
-	of_pci_dma_configure(dev);
+	pci_dma_configure(dev);

  	pci_set_dma_max_seg_size(dev, 65536);
  	pci_set_dma_seg_boundary(dev, 0xffffffff);
diff --git a/include/linux/of_pci.h b/include/linux/of_pci.h
index 29fd3fe..ce0e5ab 100644
--- a/include/linux/of_pci.h
+++ b/include/linux/of_pci.h
@@ -16,7 +16,6 @@ int of_pci_get_devfn(struct device_node *np);
  int of_irq_parse_and_map_pci(const struct pci_dev *dev, u8 slot, u8 pin);
  int of_pci_parse_bus_range(struct device_node *node, struct resource *res);
  int of_get_pci_domain_nr(struct device_node *node);
-void of_pci_dma_configure(struct pci_dev *pci_dev);
  #else
  static inline int of_irq_parse_pci(const struct pci_dev *pdev, struct of_phandle_args *out_irq)
  {
@@ -51,8 +50,6 @@ of_get_pci_domain_nr(struct device_node *node)
  {
  	return -1;
  }
-
-static inline void of_pci_dma_configure(struct pci_dev *pci_dev) { }
  #endif

  #if defined(CONFIG_OF_ADDRESS)


--
To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Linux IBM ACPI]     [Linux Power Management]     [Linux Kernel]     [Linux Laptop]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Video 4 Linux]     [Device Mapper]     [Linux Resources]

  Powered by Linux