linux-kernel - [PATCH 08/18] iommu/renesas: Remove arch/arm workaround

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Message-Id: <8489dd1d9224ad60e63b9903c40832481eab622f.1597931876.git.robin.murphy@arm.com>
Date:   Thu, 20 Aug 2020 16:08:27 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     hch@....de, joro@...tes.org, linux@...linux.org.uk
Cc:     will@...nel.org, inki.dae@...sung.com, sw0312.kim@...sung.com,
        kyungmin.park@...sung.com, m.szyprowski@...sung.com,
        agross@...nel.org, bjorn.andersson@...aro.org,
        thierry.reding@...il.com, jonathanh@...dia.com, vdumpa@...dia.com,
        digetx@...il.com, matthias.bgg@...il.com, yong.wu@...iatek.com,
        geert+renesas@...der.be, magnus.damm@...il.com, t-kristo@...com,
        s-anna@...com, laurent.pinchart@...asonboard.com,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org,
        linux-samsung-soc@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        dri-devel@...ts.freedesktop.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 08/18] iommu/renesas: Remove arch/arm workaround

Now that arch/arm is wired up for default domains and iommu-dma, remove
the shared mapping workaround and rely on groups there as well.

Signed-off-by: Robin Murphy <robin.murphy@....com>
---
 drivers/iommu/ipmmu-vmsa.c | 69 --------------------------------------
 1 file changed, 69 deletions(-)

diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c
index 0f18abda0e20..8ad74a76f402 100644
--- a/drivers/iommu/ipmmu-vmsa.c
+++ b/drivers/iommu/ipmmu-vmsa.c
@@ -26,15 +26,6 @@
 #include <linux/slab.h>
 #include <linux/sys_soc.h>
 
-#if defined(CONFIG_ARM) && !defined(CONFIG_IOMMU_DMA)
-#include <asm/dma-iommu.h>
-#else
-#define arm_iommu_create_mapping(...)	NULL
-#define arm_iommu_attach_device(...)	-ENODEV
-#define arm_iommu_release_mapping(...)	do {} while (0)
-#define arm_iommu_detach_device(...)	do {} while (0)
-#endif
-
 #define IPMMU_CTX_MAX		8U
 #define IPMMU_CTX_INVALID	-1
 
@@ -67,7 +58,6 @@ struct ipmmu_vmsa_device {
 	s8 utlb_ctx[IPMMU_UTLB_MAX];
 
 	struct iommu_group *group;
-	struct dma_iommu_mapping *mapping;
 };
 
 struct ipmmu_vmsa_domain {
@@ -805,50 +795,6 @@ static int ipmmu_of_xlate(struct device *dev,
 	return ipmmu_init_platform_device(dev, spec);
 }
 
-static int ipmmu_init_arm_mapping(struct device *dev)
-{
-	struct ipmmu_vmsa_device *mmu = to_ipmmu(dev);
-	int ret;
-
-	/*
-	 * Create the ARM mapping, used by the ARM DMA mapping core to allocate
-	 * VAs. This will allocate a corresponding IOMMU domain.
-	 *
-	 * TODO:
-	 * - Create one mapping per context (TLB).
-	 * - Make the mapping size configurable ? We currently use a 2GB mapping
-	 *   at a 1GB offset to ensure that NULL VAs will fault.
-	 */
-	if (!mmu->mapping) {
-		struct dma_iommu_mapping *mapping;
-
-		mapping = arm_iommu_create_mapping(&platform_bus_type,
-						   SZ_1G, SZ_2G);
-		if (IS_ERR(mapping)) {
-			dev_err(mmu->dev, "failed to create ARM IOMMU mapping\n");
-			ret = PTR_ERR(mapping);
-			goto error;
-		}
-
-		mmu->mapping = mapping;
-	}
-
-	/* Attach the ARM VA mapping to the device. */
-	ret = arm_iommu_attach_device(dev, mmu->mapping);
-	if (ret < 0) {
-		dev_err(dev, "Failed to attach device to VA mapping\n");
-		goto error;
-	}
-
-	return 0;
-
-error:
-	if (mmu->mapping)
-		arm_iommu_release_mapping(mmu->mapping);
-
-	return ret;
-}
-
 static struct iommu_device *ipmmu_probe_device(struct device *dev)
 {
 	struct ipmmu_vmsa_device *mmu = to_ipmmu(dev);
@@ -862,20 +808,8 @@ static struct iommu_device *ipmmu_probe_device(struct device *dev)
 	return &mmu->iommu;
 }
 
-static void ipmmu_probe_finalize(struct device *dev)
-{
-	int ret = 0;
-
-	if (IS_ENABLED(CONFIG_ARM) && !IS_ENABLED(CONFIG_IOMMU_DMA))
-		ret = ipmmu_init_arm_mapping(dev);
-
-	if (ret)
-		dev_err(dev, "Can't create IOMMU mapping - DMA-OPS will not work\n");
-}
-
 static void ipmmu_release_device(struct device *dev)
 {
-	arm_iommu_detach_device(dev);
 }
 
 static struct iommu_group *ipmmu_find_group(struct device *dev)
@@ -905,7 +839,6 @@ static const struct iommu_ops ipmmu_ops = {
 	.iova_to_phys = ipmmu_iova_to_phys,
 	.probe_device = ipmmu_probe_device,
 	.release_device = ipmmu_release_device,
-	.probe_finalize = ipmmu_probe_finalize,
 	.device_group = IS_ENABLED(CONFIG_ARM) && !IS_ENABLED(CONFIG_IOMMU_DMA)
 			? generic_device_group : ipmmu_find_group,
 	.pgsize_bitmap = SZ_1G | SZ_2M | SZ_4K,
@@ -1118,8 +1051,6 @@ static int ipmmu_remove(struct platform_device *pdev)
 	iommu_device_sysfs_remove(&mmu->iommu);
 	iommu_device_unregister(&mmu->iommu);
 
-	arm_iommu_release_mapping(mmu->mapping);
-
 	ipmmu_device_reset(mmu);
 
 	return 0;
-- 
2.28.0.dirty