diff mbox

[v4,09/13] iommu/rockchip: Use IOMMU device for dma mapping operations

Message ID 20180118115251.5542-10-jeffy.chen@rock-chips.com (mailing list archive)
State New, archived
Headers show

Commit Message

Jeffy Chen Jan. 18, 2018, 11:52 a.m. UTC 
Use the first registered IOMMU device for dma mapping operations, and
drop the domain platform device.

This is similar to exynos iommu driver.

Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
---

Changes in v4: None
Changes in v3: None
Changes in v2: None

 drivers/iommu/rockchip-iommu.c | 85 ++++++++++++------------------------------
 1 file changed, 24 insertions(+), 61 deletions(-)

Comments

Robin Murphy Jan. 18, 2018, 12:35 p.m. UTC | #1 
On 18/01/18 11:52, Jeffy Chen wrote:
> Use the first registered IOMMU device for dma mapping operations, and
> drop the domain platform device.
> 
> This is similar to exynos iommu driver.

I'd been meaning to look into this myself for the sake of removing the 
arch_setup_dma_ops() hack, so I'm glad to see it done :)

Reviewed-by: Robin Murphy <robin.murphy@arm.com>

> Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
> Reviewed-by: Tomasz Figa <tfiga@chromium.org>
> ---
> 
> Changes in v4: None
> Changes in v3: None
> Changes in v2: None
> 
>   drivers/iommu/rockchip-iommu.c | 85 ++++++++++++------------------------------
>   1 file changed, 24 insertions(+), 61 deletions(-)
> 
> diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iommu.c
> index 9b85a3050449..bdb7c5de6fc2 100644
> --- a/drivers/iommu/rockchip-iommu.c
> +++ b/drivers/iommu/rockchip-iommu.c
> @@ -77,7 +77,6 @@
>   
>   struct rk_iommu_domain {
>   	struct list_head iommus;
> -	struct platform_device *pdev;
>   	u32 *dt; /* page directory table */
>   	dma_addr_t dt_dma;
>   	spinlock_t iommus_lock; /* lock for iommus list */
> @@ -98,12 +97,14 @@ struct rk_iommu {
>   	struct iommu_domain *domain; /* domain to which iommu is attached */
>   };
>   
> +static struct device *dma_dev;
> +
>   static inline void rk_table_flush(struct rk_iommu_domain *dom, dma_addr_t dma,
>   				  unsigned int count)
>   {
>   	size_t size = count * sizeof(u32); /* count of u32 entry */
>   
> -	dma_sync_single_for_device(&dom->pdev->dev, dma, size, DMA_TO_DEVICE);
> +	dma_sync_single_for_device(dma_dev, dma, size, DMA_TO_DEVICE);
>   }
>   
>   static struct rk_iommu_domain *to_rk_domain(struct iommu_domain *dom)
> @@ -690,7 +691,6 @@ static void rk_iommu_zap_iova_first_last(struct rk_iommu_domain *rk_domain,
>   static u32 *rk_dte_get_page_table(struct rk_iommu_domain *rk_domain,
>   				  dma_addr_t iova)
>   {
> -	struct device *dev = &rk_domain->pdev->dev;
>   	u32 *page_table, *dte_addr;
>   	u32 dte_index, dte;
>   	phys_addr_t pt_phys;
> @@ -708,9 +708,9 @@ static u32 *rk_dte_get_page_table(struct rk_iommu_domain *rk_domain,
>   	if (!page_table)
>   		return ERR_PTR(-ENOMEM);
>   
> -	pt_dma = dma_map_single(dev, page_table, SPAGE_SIZE, DMA_TO_DEVICE);
> -	if (dma_mapping_error(dev, pt_dma)) {
> -		dev_err(dev, "DMA mapping error while allocating page table\n");
> +	pt_dma = dma_map_single(dma_dev, page_table, SPAGE_SIZE, DMA_TO_DEVICE);
> +	if (dma_mapping_error(dma_dev, pt_dma)) {
> +		dev_err(dma_dev, "DMA mapping error while allocating page table\n");
>   		free_page((unsigned long)page_table);
>   		return ERR_PTR(-ENOMEM);
>   	}
> @@ -982,29 +982,20 @@ static void rk_iommu_detach_device(struct iommu_domain *domain,
>   static struct iommu_domain *rk_iommu_domain_alloc(unsigned type)
>   {
>   	struct rk_iommu_domain *rk_domain;
> -	struct platform_device *pdev;
> -	struct device *iommu_dev;
>   
>   	if (type != IOMMU_DOMAIN_UNMANAGED && type != IOMMU_DOMAIN_DMA)
>   		return NULL;
>   
> -	/* Register a pdev per domain, so DMA API can base on this *dev
> -	 * even some virtual master doesn't have an iommu slave
> -	 */
> -	pdev = platform_device_register_simple("rk_iommu_domain",
> -					       PLATFORM_DEVID_AUTO, NULL, 0);
> -	if (IS_ERR(pdev))
> +	if (!dma_dev)
>   		return NULL;
>   
> -	rk_domain = devm_kzalloc(&pdev->dev, sizeof(*rk_domain), GFP_KERNEL);
> +	rk_domain = devm_kzalloc(dma_dev, sizeof(*rk_domain), GFP_KERNEL);
>   	if (!rk_domain)
> -		goto err_unreg_pdev;
> -
> -	rk_domain->pdev = pdev;
> +		return NULL;
>   
>   	if (type == IOMMU_DOMAIN_DMA &&
>   	    iommu_get_dma_cookie(&rk_domain->domain))
> -		goto err_unreg_pdev;
> +		return NULL;
>   
>   	/*
>   	 * rk32xx iommus use a 2 level pagetable.
> @@ -1015,11 +1006,10 @@ static struct iommu_domain *rk_iommu_domain_alloc(unsigned type)
>   	if (!rk_domain->dt)
>   		goto err_put_cookie;
>   
> -	iommu_dev = &pdev->dev;
> -	rk_domain->dt_dma = dma_map_single(iommu_dev, rk_domain->dt,
> +	rk_domain->dt_dma = dma_map_single(dma_dev, rk_domain->dt,
>   					   SPAGE_SIZE, DMA_TO_DEVICE);
> -	if (dma_mapping_error(iommu_dev, rk_domain->dt_dma)) {
> -		dev_err(iommu_dev, "DMA map error for DT\n");
> +	if (dma_mapping_error(dma_dev, rk_domain->dt_dma)) {
> +		dev_err(dma_dev, "DMA map error for DT\n");
>   		goto err_free_dt;
>   	}
>   
> @@ -1040,8 +1030,6 @@ static struct iommu_domain *rk_iommu_domain_alloc(unsigned type)
>   err_put_cookie:
>   	if (type == IOMMU_DOMAIN_DMA)
>   		iommu_put_dma_cookie(&rk_domain->domain);
> -err_unreg_pdev:
> -	platform_device_unregister(pdev);
>   
>   	return NULL;
>   }
> @@ -1058,20 +1046,18 @@ static void rk_iommu_domain_free(struct iommu_domain *domain)
>   		if (rk_dte_is_pt_valid(dte)) {
>   			phys_addr_t pt_phys = rk_dte_pt_address(dte);
>   			u32 *page_table = phys_to_virt(pt_phys);
> -			dma_unmap_single(&rk_domain->pdev->dev, pt_phys,
> +			dma_unmap_single(dma_dev, pt_phys,
>   					 SPAGE_SIZE, DMA_TO_DEVICE);
>   			free_page((unsigned long)page_table);
>   		}
>   	}
>   
> -	dma_unmap_single(&rk_domain->pdev->dev, rk_domain->dt_dma,
> +	dma_unmap_single(dma_dev, rk_domain->dt_dma,
>   			 SPAGE_SIZE, DMA_TO_DEVICE);
>   	free_page((unsigned long)rk_domain->dt);
>   
>   	if (domain->type == IOMMU_DOMAIN_DMA)
>   		iommu_put_dma_cookie(&rk_domain->domain);
> -
> -	platform_device_unregister(rk_domain->pdev);
>   }
>   
>   static bool rk_iommu_is_dev_iommu_master(struct device *dev)
> @@ -1194,30 +1180,6 @@ static const struct iommu_ops rk_iommu_ops = {
>   	.pgsize_bitmap = RK_IOMMU_PGSIZE_BITMAP,
>   };
>   
> -static int rk_iommu_domain_probe(struct platform_device *pdev)
> -{
> -	struct device *dev = &pdev->dev;
> -
> -	dev->dma_parms = devm_kzalloc(dev, sizeof(*dev->dma_parms), GFP_KERNEL);
> -	if (!dev->dma_parms)
> -		return -ENOMEM;
> -
> -	/* Set dma_ops for dev, otherwise it would be dummy_dma_ops */
> -	arch_setup_dma_ops(dev, 0, DMA_BIT_MASK(32), NULL, false);
> -
> -	dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
> -	dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
> -
> -	return 0;
> -}
> -
> -static struct platform_driver rk_iommu_domain_driver = {
> -	.probe = rk_iommu_domain_probe,
> -	.driver = {
> -		   .name = "rk_iommu_domain",
> -	},
> -};
> -
>   static int rk_iommu_probe(struct platform_device *pdev)
>   {
>   	struct device *dev = &pdev->dev;
> @@ -1278,6 +1240,14 @@ static int rk_iommu_probe(struct platform_device *pdev)
>   	if (err)
>   		goto err_remove_sysfs;
>   
> +	/*
> +	 * Use the first registered IOMMU device for domain to use with DMA
> +	 * API, since a domain might not physically correspond to a single
> +	 * IOMMU device..
> +	 */
> +	if (!dma_dev)
> +		dma_dev = &pdev->dev;
> +
>   	return 0;
>   err_remove_sysfs:
>   	iommu_device_sysfs_remove(&iommu->iommu);
> @@ -1316,14 +1286,7 @@ static int __init rk_iommu_init(void)
>   	if (ret)
>   		return ret;
>   
> -	ret = platform_driver_register(&rk_iommu_domain_driver);
> -	if (ret)
> -		return ret;
> -
> -	ret = platform_driver_register(&rk_iommu_driver);
> -	if (ret)
> -		platform_driver_unregister(&rk_iommu_domain_driver);
> -	return ret;
> +	return platform_driver_register(&rk_iommu_driver);
>   }
>   subsys_initcall(rk_iommu_init);
>   
>
diff mbox

Patch

diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iommu.c
index 9b85a3050449..bdb7c5de6fc2 100644
--- a/drivers/iommu/rockchip-iommu.c
+++ b/drivers/iommu/rockchip-iommu.c
@@ -77,7 +77,6 @@ 
 
 struct rk_iommu_domain {
 	struct list_head iommus;
-	struct platform_device *pdev;
 	u32 *dt; /* page directory table */
 	dma_addr_t dt_dma;
 	spinlock_t iommus_lock; /* lock for iommus list */
@@ -98,12 +97,14 @@  struct rk_iommu {
 	struct iommu_domain *domain; /* domain to which iommu is attached */
 };
 
+static struct device *dma_dev;
+
 static inline void rk_table_flush(struct rk_iommu_domain *dom, dma_addr_t dma,
 				  unsigned int count)
 {
 	size_t size = count * sizeof(u32); /* count of u32 entry */
 
-	dma_sync_single_for_device(&dom->pdev->dev, dma, size, DMA_TO_DEVICE);
+	dma_sync_single_for_device(dma_dev, dma, size, DMA_TO_DEVICE);
 }
 
 static struct rk_iommu_domain *to_rk_domain(struct iommu_domain *dom)
@@ -690,7 +691,6 @@  static void rk_iommu_zap_iova_first_last(struct rk_iommu_domain *rk_domain,
 static u32 *rk_dte_get_page_table(struct rk_iommu_domain *rk_domain,
 				  dma_addr_t iova)
 {
-	struct device *dev = &rk_domain->pdev->dev;
 	u32 *page_table, *dte_addr;
 	u32 dte_index, dte;
 	phys_addr_t pt_phys;
@@ -708,9 +708,9 @@  static u32 *rk_dte_get_page_table(struct rk_iommu_domain *rk_domain,
 	if (!page_table)
 		return ERR_PTR(-ENOMEM);
 
-	pt_dma = dma_map_single(dev, page_table, SPAGE_SIZE, DMA_TO_DEVICE);
-	if (dma_mapping_error(dev, pt_dma)) {
-		dev_err(dev, "DMA mapping error while allocating page table\n");
+	pt_dma = dma_map_single(dma_dev, page_table, SPAGE_SIZE, DMA_TO_DEVICE);
+	if (dma_mapping_error(dma_dev, pt_dma)) {
+		dev_err(dma_dev, "DMA mapping error while allocating page table\n");
 		free_page((unsigned long)page_table);
 		return ERR_PTR(-ENOMEM);
 	}
@@ -982,29 +982,20 @@  static void rk_iommu_detach_device(struct iommu_domain *domain,
 static struct iommu_domain *rk_iommu_domain_alloc(unsigned type)
 {
 	struct rk_iommu_domain *rk_domain;
-	struct platform_device *pdev;
-	struct device *iommu_dev;
 
 	if (type != IOMMU_DOMAIN_UNMANAGED && type != IOMMU_DOMAIN_DMA)
 		return NULL;
 
-	/* Register a pdev per domain, so DMA API can base on this *dev
-	 * even some virtual master doesn't have an iommu slave
-	 */
-	pdev = platform_device_register_simple("rk_iommu_domain",
-					       PLATFORM_DEVID_AUTO, NULL, 0);
-	if (IS_ERR(pdev))
+	if (!dma_dev)
 		return NULL;
 
-	rk_domain = devm_kzalloc(&pdev->dev, sizeof(*rk_domain), GFP_KERNEL);
+	rk_domain = devm_kzalloc(dma_dev, sizeof(*rk_domain), GFP_KERNEL);
 	if (!rk_domain)
-		goto err_unreg_pdev;
-
-	rk_domain->pdev = pdev;
+		return NULL;
 
 	if (type == IOMMU_DOMAIN_DMA &&
 	    iommu_get_dma_cookie(&rk_domain->domain))
-		goto err_unreg_pdev;
+		return NULL;
 
 	/*
 	 * rk32xx iommus use a 2 level pagetable.
@@ -1015,11 +1006,10 @@  static struct iommu_domain *rk_iommu_domain_alloc(unsigned type)
 	if (!rk_domain->dt)
 		goto err_put_cookie;
 
-	iommu_dev = &pdev->dev;
-	rk_domain->dt_dma = dma_map_single(iommu_dev, rk_domain->dt,
+	rk_domain->dt_dma = dma_map_single(dma_dev, rk_domain->dt,
 					   SPAGE_SIZE, DMA_TO_DEVICE);
-	if (dma_mapping_error(iommu_dev, rk_domain->dt_dma)) {
-		dev_err(iommu_dev, "DMA map error for DT\n");
+	if (dma_mapping_error(dma_dev, rk_domain->dt_dma)) {
+		dev_err(dma_dev, "DMA map error for DT\n");
 		goto err_free_dt;
 	}
 
@@ -1040,8 +1030,6 @@  static struct iommu_domain *rk_iommu_domain_alloc(unsigned type)
 err_put_cookie:
 	if (type == IOMMU_DOMAIN_DMA)
 		iommu_put_dma_cookie(&rk_domain->domain);
-err_unreg_pdev:
-	platform_device_unregister(pdev);
 
 	return NULL;
 }
@@ -1058,20 +1046,18 @@  static void rk_iommu_domain_free(struct iommu_domain *domain)
 		if (rk_dte_is_pt_valid(dte)) {
 			phys_addr_t pt_phys = rk_dte_pt_address(dte);
 			u32 *page_table = phys_to_virt(pt_phys);
-			dma_unmap_single(&rk_domain->pdev->dev, pt_phys,
+			dma_unmap_single(dma_dev, pt_phys,
 					 SPAGE_SIZE, DMA_TO_DEVICE);
 			free_page((unsigned long)page_table);
 		}
 	}
 
-	dma_unmap_single(&rk_domain->pdev->dev, rk_domain->dt_dma,
+	dma_unmap_single(dma_dev, rk_domain->dt_dma,
 			 SPAGE_SIZE, DMA_TO_DEVICE);
 	free_page((unsigned long)rk_domain->dt);
 
 	if (domain->type == IOMMU_DOMAIN_DMA)
 		iommu_put_dma_cookie(&rk_domain->domain);
-
-	platform_device_unregister(rk_domain->pdev);
 }
 
 static bool rk_iommu_is_dev_iommu_master(struct device *dev)
@@ -1194,30 +1180,6 @@  static const struct iommu_ops rk_iommu_ops = {
 	.pgsize_bitmap = RK_IOMMU_PGSIZE_BITMAP,
 };
 
-static int rk_iommu_domain_probe(struct platform_device *pdev)
-{
-	struct device *dev = &pdev->dev;
-
-	dev->dma_parms = devm_kzalloc(dev, sizeof(*dev->dma_parms), GFP_KERNEL);
-	if (!dev->dma_parms)
-		return -ENOMEM;
-
-	/* Set dma_ops for dev, otherwise it would be dummy_dma_ops */
-	arch_setup_dma_ops(dev, 0, DMA_BIT_MASK(32), NULL, false);
-
-	dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
-	dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
-
-	return 0;
-}
-
-static struct platform_driver rk_iommu_domain_driver = {
-	.probe = rk_iommu_domain_probe,
-	.driver = {
-		   .name = "rk_iommu_domain",
-	},
-};
-
 static int rk_iommu_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -1278,6 +1240,14 @@  static int rk_iommu_probe(struct platform_device *pdev)
 	if (err)
 		goto err_remove_sysfs;
 
+	/*
+	 * Use the first registered IOMMU device for domain to use with DMA
+	 * API, since a domain might not physically correspond to a single
+	 * IOMMU device..
+	 */
+	if (!dma_dev)
+		dma_dev = &pdev->dev;
+
 	return 0;
 err_remove_sysfs:
 	iommu_device_sysfs_remove(&iommu->iommu);
@@ -1316,14 +1286,7 @@  static int __init rk_iommu_init(void)
 	if (ret)
 		return ret;
 
-	ret = platform_driver_register(&rk_iommu_domain_driver);
-	if (ret)
-		return ret;
-
-	ret = platform_driver_register(&rk_iommu_driver);
-	if (ret)
-		platform_driver_unregister(&rk_iommu_domain_driver);
-	return ret;
+	return platform_driver_register(&rk_iommu_driver);
 }
 subsys_initcall(rk_iommu_init);