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Subject[PATCH 1/1] device.h: arm,dma-iommu: Move out dma_iommu_mapping struct
Date
From: Ritesh Harjani <ritesh.harjani@gmail.com>

This patch moves out *mapping pointer of dma_iommu_mapping
from arch/arm/include/asm/device.h to include/liunux/device.h

Also, it moves out complete structre definition of dma_iommu_mapping
to include/linux/iommu-helper.h

This is done since arm iommu's dma-mapping arch independent code,
needs to be moved out to lib/iommu-helper.c, this means
dma_iommu_mapping will be arch independent and later other archs
can make use of it.

Signed-off-by: Ritesh Harjani <ritesh.harjani@gmail.com>
---
arch/arm/Kconfig | 4 ++++
arch/arm/include/asm/device.h | 9 ---------
arch/arm/include/asm/dma-iommu.h | 16 +---------------
arch/arm/mm/dma-mapping.c | 20 ++++++++++----------
drivers/gpu/drm/exynos/exynos_drm_iommu.c | 10 +++++-----
include/linux/device.h | 4 ++++
include/linux/iommu-helper.h | 22 ++++++++++++++++++++++
7 files changed, 46 insertions(+), 39 deletions(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index c0b31fc..20717fb 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -78,6 +78,7 @@ config ARM_DMA_USE_IOMMU
bool
select ARM_HAS_SG_CHAIN
select NEED_SG_DMA_LENGTH
+ select DMA_USE_IOMMU_HELPER_MAPPING

if ARM_DMA_USE_IOMMU

@@ -1945,6 +1946,9 @@ config SWIOTLB
config IOMMU_HELPER
def_bool SWIOTLB

+config DMA_USE_IOMMU_HELPER_MAPPING
+ def_bool n
+
config XEN_DOM0
def_bool y
depends on XEN
diff --git a/arch/arm/include/asm/device.h b/arch/arm/include/asm/device.h
index dc662fc..6e2cb0e 100644
--- a/arch/arm/include/asm/device.h
+++ b/arch/arm/include/asm/device.h
@@ -14,9 +14,6 @@ struct dev_archdata {
#ifdef CONFIG_IOMMU_API
void *iommu; /* private IOMMU data */
#endif
-#ifdef CONFIG_ARM_DMA_USE_IOMMU
- struct dma_iommu_mapping *mapping;
-#endif
};

struct omap_device;
@@ -27,10 +24,4 @@ struct pdev_archdata {
#endif
};

-#ifdef CONFIG_ARM_DMA_USE_IOMMU
-#define to_dma_iommu_mapping(dev) ((dev)->archdata.mapping)
-#else
-#define to_dma_iommu_mapping(dev) NULL
-#endif
-
#endif
diff --git a/arch/arm/include/asm/dma-iommu.h b/arch/arm/include/asm/dma-iommu.h
index 8e3fcb9..50c010b 100644
--- a/arch/arm/include/asm/dma-iommu.h
+++ b/arch/arm/include/asm/dma-iommu.h
@@ -8,21 +8,7 @@
#include <linux/dma-debug.h>
#include <linux/kmemcheck.h>
#include <linux/kref.h>
-
-struct dma_iommu_mapping {
- /* iommu specific data */
- struct iommu_domain *domain;
-
- unsigned long **bitmaps; /* array of bitmaps */
- unsigned int nr_bitmaps; /* nr of elements in array */
- unsigned int extensions;
- size_t bitmap_size; /* size of a single bitmap */
- size_t bits; /* per bitmap */
- dma_addr_t base;
-
- spinlock_t lock;
- struct kref kref;
-};
+#include <linux/iommu-helper.h>

struct dma_iommu_mapping *
arm_iommu_create_mapping(struct bus_type *bus, dma_addr_t base, size_t size);
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 3d43c41..b82561e 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -1292,7 +1292,7 @@ err:
static dma_addr_t
__iommu_create_mapping(struct device *dev, struct page **pages, size_t size)
{
- struct dma_iommu_mapping *mapping = dev->archdata.mapping;
+ struct dma_iommu_mapping *mapping = dev->mapping;
unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
dma_addr_t dma_addr, iova;
int i, ret = DMA_ERROR_CODE;
@@ -1328,7 +1328,7 @@ fail:

static int __iommu_remove_mapping(struct device *dev, dma_addr_t iova, size_t size)
{
- struct dma_iommu_mapping *mapping = dev->archdata.mapping;
+ struct dma_iommu_mapping *mapping = dev->mapping;

/*
* add optional in-page offset from iova to size and align
@@ -1541,7 +1541,7 @@ static int __map_sg_chunk(struct device *dev, struct scatterlist *sg,
enum dma_data_direction dir, struct dma_attrs *attrs,
bool is_coherent)
{
- struct dma_iommu_mapping *mapping = dev->archdata.mapping;
+ struct dma_iommu_mapping *mapping = dev->mapping;
dma_addr_t iova, iova_base;
int ret = 0;
unsigned int count;
@@ -1762,7 +1762,7 @@ static dma_addr_t arm_coherent_iommu_map_page(struct device *dev, struct page *p
unsigned long offset, size_t size, enum dma_data_direction dir,
struct dma_attrs *attrs)
{
- struct dma_iommu_mapping *mapping = dev->archdata.mapping;
+ struct dma_iommu_mapping *mapping = dev->mapping;
dma_addr_t dma_addr;
int ret, prot, len = PAGE_ALIGN(size + offset);

@@ -1815,7 +1815,7 @@ static void arm_coherent_iommu_unmap_page(struct device *dev, dma_addr_t handle,
size_t size, enum dma_data_direction dir,
struct dma_attrs *attrs)
{
- struct dma_iommu_mapping *mapping = dev->archdata.mapping;
+ struct dma_iommu_mapping *mapping = dev->mapping;
dma_addr_t iova = handle & PAGE_MASK;
int offset = handle & ~PAGE_MASK;
int len = PAGE_ALIGN(size + offset);
@@ -1840,7 +1840,7 @@ static void arm_iommu_unmap_page(struct device *dev, dma_addr_t handle,
size_t size, enum dma_data_direction dir,
struct dma_attrs *attrs)
{
- struct dma_iommu_mapping *mapping = dev->archdata.mapping;
+ struct dma_iommu_mapping *mapping = dev->mapping;
dma_addr_t iova = handle & PAGE_MASK;
struct page *page = phys_to_page(iommu_iova_to_phys(mapping->domain, iova));
int offset = handle & ~PAGE_MASK;
@@ -1859,7 +1859,7 @@ static void arm_iommu_unmap_page(struct device *dev, dma_addr_t handle,
static void arm_iommu_sync_single_for_cpu(struct device *dev,
dma_addr_t handle, size_t size, enum dma_data_direction dir)
{
- struct dma_iommu_mapping *mapping = dev->archdata.mapping;
+ struct dma_iommu_mapping *mapping = dev->mapping;
dma_addr_t iova = handle & PAGE_MASK;
struct page *page = phys_to_page(iommu_iova_to_phys(mapping->domain, iova));
unsigned int offset = handle & ~PAGE_MASK;
@@ -1873,7 +1873,7 @@ static void arm_iommu_sync_single_for_cpu(struct device *dev,
static void arm_iommu_sync_single_for_device(struct device *dev,
dma_addr_t handle, size_t size, enum dma_data_direction dir)
{
- struct dma_iommu_mapping *mapping = dev->archdata.mapping;
+ struct dma_iommu_mapping *mapping = dev->mapping;
dma_addr_t iova = handle & PAGE_MASK;
struct page *page = phys_to_page(iommu_iova_to_phys(mapping->domain, iova));
unsigned int offset = handle & ~PAGE_MASK;
@@ -2045,7 +2045,7 @@ int arm_iommu_attach_device(struct device *dev,
return err;

kref_get(&mapping->kref);
- dev->archdata.mapping = mapping;
+ dev->mapping = mapping;
set_dma_ops(dev, &iommu_ops);

pr_debug("Attached IOMMU controller to %s device.\n", dev_name(dev));
@@ -2072,7 +2072,7 @@ void arm_iommu_detach_device(struct device *dev)

iommu_detach_device(mapping->domain, dev);
kref_put(&mapping->kref, release_iommu_mapping);
- dev->archdata.mapping = NULL;
+ dev->mapping = NULL;
set_dma_ops(dev, NULL);

pr_debug("Detached IOMMU controller from %s device.\n", dev_name(dev));
diff --git a/drivers/gpu/drm/exynos/exynos_drm_iommu.c b/drivers/gpu/drm/exynos/exynos_drm_iommu.c
index 091068f..2dabdbf 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_iommu.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_iommu.c
@@ -46,7 +46,7 @@ int drm_create_iommu_mapping(struct drm_device *drm_dev)
dev->dma_parms = devm_kzalloc(dev, sizeof(*dev->dma_parms),
GFP_KERNEL);
dma_set_max_seg_size(dev, 0xffffffffu);
- dev->archdata.mapping = mapping;
+ dev->mapping = mapping;

return 0;
}
@@ -63,7 +63,7 @@ void drm_release_iommu_mapping(struct drm_device *drm_dev)
{
struct device *dev = drm_dev->dev;

- arm_iommu_release_mapping(dev->archdata.mapping);
+ arm_iommu_release_mapping(dev->mapping);
}

/*
@@ -81,7 +81,7 @@ int drm_iommu_attach_device(struct drm_device *drm_dev,
struct device *dev = drm_dev->dev;
int ret;

- if (!dev->archdata.mapping) {
+ if (!dev->mapping) {
DRM_ERROR("iommu_mapping is null.\n");
return -EFAULT;
}
@@ -91,7 +91,7 @@ int drm_iommu_attach_device(struct drm_device *drm_dev,
GFP_KERNEL);
dma_set_max_seg_size(subdrv_dev, 0xffffffffu);

- ret = arm_iommu_attach_device(subdrv_dev, dev->archdata.mapping);
+ ret = arm_iommu_attach_device(subdrv_dev, dev->mapping);
if (ret < 0) {
DRM_DEBUG_KMS("failed iommu attach.\n");
return ret;
@@ -124,7 +124,7 @@ void drm_iommu_detach_device(struct drm_device *drm_dev,
struct device *subdrv_dev)
{
struct device *dev = drm_dev->dev;
- struct dma_iommu_mapping *mapping = dev->archdata.mapping;
+ struct dma_iommu_mapping *mapping = dev->mapping;

if (!mapping || !mapping->domain)
return;
diff --git a/include/linux/device.h b/include/linux/device.h
index c0a1261..c73df6f 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -705,6 +705,10 @@ struct device {
/* arch specific additions */
struct dev_archdata archdata;

+#ifdef CONFIG_DMA_USE_IOMMU_HELPER_MAPPING
+ struct dma_iommu_mapping *mapping;
+#endif
+
struct device_node *of_node; /* associated device tree node */
struct acpi_dev_node acpi_node; /* associated ACPI device node */

diff --git a/include/linux/iommu-helper.h b/include/linux/iommu-helper.h
index 86bdeff..0c5e4c7 100644
--- a/include/linux/iommu-helper.h
+++ b/include/linux/iommu-helper.h
@@ -3,6 +3,28 @@

#include <linux/kernel.h>

+#ifdef CONFIG_DMA_USE_IOMMU_HELPER_MAPPING
+struct dma_iommu_mapping {
+ /* iommu specific data */
+ struct iommu_domain *domain;
+
+ unsigned long **bitmaps; /* array of bitmaps */
+ unsigned int nr_bitmaps; /* nr of elements in array */
+ unsigned int extensions;
+ size_t bitmap_size; /* size of a single bitmap */
+ size_t bits; /* per bitmap */
+ dma_addr_t base;
+
+ spinlock_t lock;
+ struct kref kref;
+};
+
+#define to_dma_iommu_mapping(dev) ((dev)->mapping)
+#else
+#define to_dma_iommu_mapping(dev) NULL
+#endif
+
+
static inline unsigned long iommu_device_max_index(unsigned long size,
unsigned long offset,
u64 dma_mask)
--
1.8.1.3


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