[PATCH v2 1/3] powerpc/pci: Default to dma_direct_ops for pci dma_ops

[PATCH v2 1/3] powerpc/pci: Default to dma_direct_ops for pci dma_ops

[Kumar Gala]

This will allow us to remove the ppc32 specific checks in get_dma_ops()
that defaults to dma_direct_ops if the archdata is NULL.  We really
should always have archdata set to something going forward.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
---
 arch/powerpc/kernel/pci-common.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
index 2603f20..9c69e7e 100644
--- a/arch/powerpc/kernel/pci-common.c
+++ b/arch/powerpc/kernel/pci-common.c
@@ -50,7 +50,7 @@ resource_size_t isa_mem_base;
 unsigned int ppc_pci_flags = 0;
 
 
-static struct dma_mapping_ops *pci_dma_ops;
+static struct dma_mapping_ops *pci_dma_ops = &dma_direct_ops;
 
 void set_pci_dma_ops(struct dma_mapping_ops *dma_ops)
 {
-- 
1.5.6.6

[PATCH v2 2/3] powerpc: setup default archdata for {of_}platform via bus_register_notifier

[Kumar Gala]

Since a number of powerpc chips are SoCs we end up having dma-able
devices that are registered as platform or of_platform devices.  We need
to hook the archdata to setup proper dma_ops for these devices.

Rather than having to add a bus_notify to each platform we add a default
one at the highest priority (called first) to set the default dma_ops for
of_platform and platform devices to dma_direct_ops.  This allows platform
code to override the ops by providing their own notifier call back.

In the future to enable >4G DMA support on ppc32 we can hook swiotlb ops.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
---

* Use bus notifiers instead of platform_notify

 arch/powerpc/kernel/setup-common.c        |   36 +++++++++++++++++++++++++++++
 arch/powerpc/platforms/cell/qpace_setup.c |   13 ----------
 2 files changed, 36 insertions(+), 13 deletions(-)

diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index 705fc4b..9774f9f 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -35,6 +35,8 @@
 #include <linux/debugfs.h>
 #include <linux/percpu.h>
 #include <linux/lmb.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
 #include <asm/io.h>
 #include <asm/prom.h>
 #include <asm/processor.h>
@@ -669,3 +671,37 @@ static int powerpc_debugfs_init(void)
 }
 arch_initcall(powerpc_debugfs_init);
 #endif
+
+static int ppc_dflt_bus_notify(struct notifier_block *nb,
+				unsigned long action, void *data)
+{
+	struct device *dev = data;
+
+	/* We are only intereted in device addition */
+	if (action != BUS_NOTIFY_ADD_DEVICE)
+		return 0;
+
+	set_dma_ops(dev, &dma_direct_ops);
+
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block ppc_dflt_plat_bus_notifier = {
+	.notifier_call = ppc_dflt_bus_notify,
+	.priority = INT_MAX,
+};
+
+static struct notifier_block ppc_dflt_of_bus_notifier = {
+	.notifier_call = ppc_dflt_bus_notify,
+	.priority = INT_MAX,
+};
+
+static int __init setup_bus_notifier(void)
+{
+	bus_register_notifier(&platform_bus_type, &ppc_dflt_plat_bus_notifier);
+	bus_register_notifier(&of_platform_bus_type, &ppc_dflt_of_bus_notifier);
+
+	return 0;
+}
+
+arch_initcall(setup_bus_notifier);
diff --git a/arch/powerpc/platforms/cell/qpace_setup.c b/arch/powerpc/platforms/cell/qpace_setup.c
index c75b662..c5ce02e 100644
--- a/arch/powerpc/platforms/cell/qpace_setup.c
+++ b/arch/powerpc/platforms/cell/qpace_setup.c
@@ -81,16 +81,6 @@ static int __init qpace_publish_devices(void)
 }
 machine_subsys_initcall(qpace, qpace_publish_devices);
 
-extern int qpace_notify(struct device *dev)
-{
-	/* set dma_ops for of_platform bus */
-	if (dev->bus && dev->bus->name
-			&& !strcmp(dev->bus->name, "of_platform"))
-		set_dma_ops(dev, &dma_direct_ops);
-
-	return 0;
-}
-
 static void __init qpace_setup_arch(void)
 {
 #ifdef CONFIG_SPU_BASE
@@ -115,9 +105,6 @@ static void __init qpace_setup_arch(void)
 #ifdef CONFIG_DUMMY_CONSOLE
 	conswitchp = &dummy_con;
 #endif
-
-	/* set notifier function */
-	platform_notify = &qpace_notify;
 }
 
 static int __init qpace_probe(void)
-- 
1.5.6.6

[PATCH v2 3/3] powerpc: expect all devices calling dma ops to have archdata set

[Kumar Gala]

Now that we set archdata for of_platform and platform devices via
platform_notify() we no longer need to special case having a NULL device
pointer or NULL archdata.  It should be a driver error if this condition
shows up and the driver should be fixed.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
---
 arch/powerpc/include/asm/dma-mapping.h |   12 +-----------
 1 files changed, 1 insertions(+), 11 deletions(-)

diff --git a/arch/powerpc/include/asm/dma-mapping.h b/arch/powerpc/include/asm/dma-mapping.h
index 86cef7d..c69f2b5 100644
--- a/arch/powerpc/include/asm/dma-mapping.h
+++ b/arch/powerpc/include/asm/dma-mapping.h
@@ -109,18 +109,8 @@ static inline struct dma_mapping_ops *get_dma_ops(struct device *dev)
 	 * only ISA DMA device we support is the floppy and we have a hack
 	 * in the floppy driver directly to get a device for us.
 	 */
-
-	if (unlikely(dev == NULL) || dev->archdata.dma_ops == NULL) {
-#ifdef CONFIG_PPC64
+	if (unlikely(dev == NULL))
 		return NULL;
-#else
-		/* Use default on 32-bit if dma_ops is not set up */
-		/* TODO: Long term, we should fix drivers so that dev and
-		 * archdata dma_ops are set up for all buses.
-		 */
-		return &dma_direct_ops;
-#endif
-	}
 
 	return dev->archdata.dma_ops;
 }
-- 
1.5.6.6

Re: [PATCH v2 3/3] powerpc: expect all devices calling dma ops to have archdata set

[Benjamin Krill]

* Kumar Gala | 2009-03-19 08:40:52 [-0500]:

>Now that we set archdata for of_platform and platform devices via
>platform_notify() we no longer need to special case having a NULL device
>pointer or NULL archdata.  It should be a driver error if this condition
>shows up and the driver should be fixed.
>
>Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

Acked-by: Benjamin Krill <ben@codiert.org>

Tested on QPACE node card.

Re: [PATCH v2 2/3] powerpc: setup default archdata for {of_}platform via bus_register_notifier

[Benjamin Krill]

* Kumar Gala | 2009-03-19 08:40:51 [-0500]:

>Since a number of powerpc chips are SoCs we end up having dma-able
>devices that are registered as platform or of_platform devices.  We need
>to hook the archdata to setup proper dma_ops for these devices.
>
>Rather than having to add a bus_notify to each platform we add a default
>one at the highest priority (called first) to set the default dma_ops for
>of_platform and platform devices to dma_direct_ops.  This allows platform
>code to override the ops by providing their own notifier call back.
>
>In the future to enable >4G DMA support on ppc32 we can hook swiotlb ops.
>
>Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

Acked-by: Benjamin Krill <ben@codiert.org>

Tested on QPACE node card.

Re: [PATCH v2 1/3] powerpc/pci: Default to dma_direct_ops for pci dma_ops

[Benjamin Krill]

* Kumar Gala | 2009-03-19 08:40:50 [-0500]:

>This will allow us to remove the ppc32 specific checks in get_dma_ops()
>that defaults to dma_direct_ops if the archdata is NULL.  We really
>should always have archdata set to something going forward.
>
>Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

Acked-by: Benjamin Krill <ben@codiert.org>

Tested on QPACE node card.