From 68efd7d2fb32c2606f1da318b6a851d933813f27 Mon Sep 17 00:00:00 2001 From: Marek Szyprowski Date: Tue, 25 Feb 2014 13:01:09 +0100 Subject: arm: dma-mapping: remove order parameter from arm_iommu_create_mapping() The 'order' parameter for IOMMU-aware dma-mapping implementation was introduced mainly as a hack to reduce size of the bitmap used for tracking IO virtual address space. Since now it is possible to dynamically resize the bitmap, this hack is not needed and can be removed without any impact on the client devices. This way the parameters for arm_iommu_create_mapping() becomes much easier to understand. 'size' parameter now means the maximum supported IO address space size. The code will allocate (resize) bitmap in chunks, ensuring that a single chunk is not larger than a single memory page to avoid unreliable allocations of size larger than PAGE_SIZE in atomic context. Signed-off-by: Marek Szyprowski --- drivers/gpu/drm/exynos/exynos_drm_drv.h | 2 -- drivers/gpu/drm/exynos/exynos_drm_iommu.c | 6 ++---- drivers/gpu/drm/exynos/exynos_drm_iommu.h | 1 - drivers/iommu/shmobile-iommu.c | 2 +- 4 files changed, 3 insertions(+), 8 deletions(-) (limited to 'drivers') diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.h b/drivers/gpu/drm/exynos/exynos_drm_drv.h index 0eaf5a27e120..a8f9dba2a816 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_drv.h +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.h @@ -237,7 +237,6 @@ struct drm_exynos_file_private { * otherwise default one. * @da_space_size: size of device address space. * if 0 then default value is used for it. - * @da_space_order: order to device address space. */ struct exynos_drm_private { struct drm_fb_helper *fb_helper; @@ -255,7 +254,6 @@ struct exynos_drm_private { unsigned long da_start; unsigned long da_space_size; - unsigned long da_space_order; }; /* diff --git a/drivers/gpu/drm/exynos/exynos_drm_iommu.c b/drivers/gpu/drm/exynos/exynos_drm_iommu.c index fb8db0378274..b32b291f88ff 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_iommu.c +++ b/drivers/gpu/drm/exynos/exynos_drm_iommu.c @@ -36,12 +36,10 @@ int drm_create_iommu_mapping(struct drm_device *drm_dev) priv->da_start = EXYNOS_DEV_ADDR_START; if (!priv->da_space_size) priv->da_space_size = EXYNOS_DEV_ADDR_SIZE; - if (!priv->da_space_order) - priv->da_space_order = EXYNOS_DEV_ADDR_ORDER; mapping = arm_iommu_create_mapping(&platform_bus_type, priv->da_start, - priv->da_space_size, - priv->da_space_order); + priv->da_space_size); + if (IS_ERR(mapping)) return PTR_ERR(mapping); diff --git a/drivers/gpu/drm/exynos/exynos_drm_iommu.h b/drivers/gpu/drm/exynos/exynos_drm_iommu.h index 598e60f57d4b..72376d41c512 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_iommu.h +++ b/drivers/gpu/drm/exynos/exynos_drm_iommu.h @@ -14,7 +14,6 @@ #define EXYNOS_DEV_ADDR_START 0x20000000 #define EXYNOS_DEV_ADDR_SIZE 0x40000000 -#define EXYNOS_DEV_ADDR_ORDER 0x0 #ifdef CONFIG_DRM_EXYNOS_IOMMU diff --git a/drivers/iommu/shmobile-iommu.c b/drivers/iommu/shmobile-iommu.c index 7a3b928fad1c..464acda0bbc4 100644 --- a/drivers/iommu/shmobile-iommu.c +++ b/drivers/iommu/shmobile-iommu.c @@ -343,7 +343,7 @@ static int shmobile_iommu_add_device(struct device *dev) mapping = archdata->iommu_mapping; if (!mapping) { mapping = arm_iommu_create_mapping(&platform_bus_type, 0, - L1_LEN << 20, 0); + L1_LEN << 20); if (IS_ERR(mapping)) return PTR_ERR(mapping); archdata->iommu_mapping = mapping; -- cgit v1.2.3