From: Shunqian Zheng Date: Tue, 21 Jun 2016 04:34:40 +0000 (+0900) Subject: FROMLIST: drm/rockchip: Use common IOMMU API to attach devices X-Git-Tag: firefly_0821_release~1141 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=cacb6f5876a70cf54cb67f4bb9c4284bd88304b9;p=firefly-linux-kernel-4.4.55.git FROMLIST: drm/rockchip: Use common IOMMU API to attach devices Rockchip DRM used the arm special API, arm_iommu_*(), to attach iommu for ARM32 SoCs. This patch convert to common iommu API so it would support ARM64 like RK3399. Since previous patch added support for direct IOMMU address space management, there is no need to use DMA API anymore and this patch wires things to use the new method. Signed-off-by: Shunqian Zheng Signed-off-by: Tomasz Figa (am from https://patchwork.kernel.org/patch/9196389/) BUG=chrome-os-partner:53565 TEST=boot to ui on Gru Reviewed-on: https://chromium-review.googlesource.com/349521 Commit-Ready: Tomasz Figa Tested-by: Tomasz Figa Reviewed-by: Tomasz Figa Conflicts: drivers/gpu/drm/rockchip/rockchip_drm_drv.c Change-Id: Ide4ce9f74fd431f0b7cd480e38b683f833733b40 Signed-off-by: Randy Li --- diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c index 2b236a533152..148e6d4de154 100644 --- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c @@ -14,8 +14,6 @@ * GNU General Public License for more details. */ -#include - #include #include #include @@ -23,6 +21,7 @@ #include #include #include +#include #include #include #include @@ -31,6 +30,9 @@ #include #include #include +#include + +#include #include "rockchip_drm_drv.h" #include "rockchip_drm_fb.h" @@ -616,28 +618,31 @@ err_unlock: int rockchip_drm_dma_attach_device(struct drm_device *drm_dev, struct device *dev) { - struct dma_iommu_mapping *mapping = drm_dev->dev->archdata.mapping; + struct rockchip_drm_private *private = drm_dev->dev_private; int ret; if (!is_support_iommu) return 0; - ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32)); - if (ret) + ret = iommu_attach_device(private->domain, dev); + if (ret) { + dev_err(dev, "Failed to attach iommu device\n"); return ret; + } - dma_set_max_seg_size(dev, DMA_BIT_MASK(32)); - - return arm_iommu_attach_device(dev, mapping); + return 0; } void rockchip_drm_dma_detach_device(struct drm_device *drm_dev, struct device *dev) { + struct rockchip_drm_private *private = drm_dev->dev_private; + struct iommu_domain *domain = private->domain; + if (!is_support_iommu) return; - arm_iommu_detach_device(dev); + iommu_detach_device(domain, dev); } int rockchip_register_crtc_funcs(struct drm_crtc *crtc, @@ -702,10 +707,44 @@ static void rockchip_drm_crtc_disable_vblank(struct drm_device *dev, priv->crtc_funcs[pipe]->disable_vblank(crtc); } +static int rockchip_drm_init_iommu(struct drm_device *drm_dev) +{ + struct rockchip_drm_private *private = drm_dev->dev_private; + struct iommu_domain_geometry *geometry; + u64 start, end; + + if (!is_support_iommu) + return 0; + + private->domain = iommu_domain_alloc(&platform_bus_type); + if (!private->domain) + return -ENOMEM; + + geometry = &private->domain->geometry; + start = geometry->aperture_start; + end = geometry->aperture_end; + + DRM_DEBUG("IOMMU context initialized (aperture: %#llx-%#llx)\n", + start, end); + drm_mm_init(&private->mm, start, end - start + 1); + + return 0; +} + +static void rockchip_iommu_cleanup(struct drm_device *drm_dev) +{ + struct rockchip_drm_private *private = drm_dev->dev_private; + + if (!is_support_iommu) + return; + + drm_mm_takedown(&private->mm); + iommu_domain_free(private->domain); +} + static int rockchip_drm_load(struct drm_device *drm_dev, unsigned long flags) { struct rockchip_drm_private *private; - struct dma_iommu_mapping *mapping = NULL; struct device *dev = drm_dev->dev; struct drm_connector *connector; int ret; @@ -728,38 +767,14 @@ static int rockchip_drm_load(struct drm_device *drm_dev, unsigned long flags) rockchip_drm_mode_config_init(drm_dev); - dev->dma_parms = devm_kzalloc(dev, sizeof(*dev->dma_parms), - GFP_KERNEL); - if (!dev->dma_parms) { - ret = -ENOMEM; + ret = rockchip_drm_init_iommu(drm_dev); + if (ret) goto err_config_cleanup; - } - - if (is_support_iommu) { - /* TODO(djkurtz): fetch the mapping start/size from somewhere */ - mapping = arm_iommu_create_mapping(&platform_bus_type, - 0x00000000, - SZ_2G); - if (IS_ERR(mapping)) { - ret = PTR_ERR(mapping); - goto err_config_cleanup; - } - - ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32)); - if (ret) - goto err_release_mapping; - - dma_set_max_seg_size(dev, DMA_BIT_MASK(32)); - - ret = arm_iommu_attach_device(dev, mapping); - if (ret) - goto err_release_mapping; - } /* Try to bind all sub drivers. */ ret = component_bind_all(dev, drm_dev); if (ret) - goto err_detach_device; + goto err_iommu_cleanup; /* * All components are now added, we can publish the connector sysfs @@ -808,8 +823,6 @@ static int rockchip_drm_load(struct drm_device *drm_dev, unsigned long flags) drm_dev->mode_config.allow_fb_modifiers = true; - if (is_support_iommu) - arm_iommu_release_mapping(mapping); return 0; err_vblank_cleanup: drm_vblank_cleanup(drm_dev); @@ -817,12 +830,8 @@ err_kms_helper_poll_fini: drm_kms_helper_poll_fini(drm_dev); err_unbind: component_unbind_all(dev, drm_dev); -err_detach_device: - if (is_support_iommu) - arm_iommu_detach_device(dev); -err_release_mapping: - if (is_support_iommu) - arm_iommu_release_mapping(mapping); +err_iommu_cleanup: + rockchip_iommu_cleanup(drm_dev); err_config_cleanup: drm_mode_config_cleanup(drm_dev); drm_dev->dev_private = NULL; @@ -837,8 +846,7 @@ static int rockchip_drm_unload(struct drm_device *drm_dev) drm_vblank_cleanup(drm_dev); drm_kms_helper_poll_fini(drm_dev); component_unbind_all(dev, drm_dev); - if (is_support_iommu) - arm_iommu_detach_device(dev); + rockchip_iommu_cleanup(drm_dev); drm_mode_config_cleanup(drm_dev); drm_dev->dev_private = NULL;