linux-kernel - [PATCH v3 05/25] iommu/exynos: Drop IOVA cookie management

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Message-Id: <fc13c3abc2939825f20ba4733ac8abb90b58528f.1628094601.git.robin.murphy@arm.com>
Date:   Wed,  4 Aug 2021 18:15:33 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     joro@...tes.org, will@...nel.org
Cc:     iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        suravee.suthikulpanit@....com, baolu.lu@...ux.intel.com,
        john.garry@...wei.com, dianders@...omium.org, rajatja@...gle.com,
        chenxiang66@...ilicon.com,
        Marek Szyprowski <m.szyprowski@...sung.com>
Subject: [PATCH v3 05/25] iommu/exynos: Drop IOVA cookie management

The core code bakes its own cookies now.

CC: Marek Szyprowski <m.szyprowski@...sung.com>
Signed-off-by: Robin Murphy <robin.murphy@....com>

---

v3: Also remove unneeded include
---
 drivers/iommu/exynos-iommu.c | 19 ++++---------------
 1 file changed, 4 insertions(+), 15 deletions(-)

diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index d0fbf1d10e18..939ffa768986 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -21,7 +21,6 @@
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/slab.h>
-#include <linux/dma-iommu.h>
 
 typedef u32 sysmmu_iova_t;
 typedef u32 sysmmu_pte_t;
@@ -735,20 +734,16 @@ static struct iommu_domain *exynos_iommu_domain_alloc(unsigned type)
 	/* Check if correct PTE offsets are initialized */
 	BUG_ON(PG_ENT_SHIFT < 0 || !dma_dev);
 
+	if (type != IOMMU_DOMAIN_DMA && type != IOMMU_DOMAIN_UNMANAGED)
+		return NULL;
+
 	domain = kzalloc(sizeof(*domain), GFP_KERNEL);
 	if (!domain)
 		return NULL;
 
-	if (type == IOMMU_DOMAIN_DMA) {
-		if (iommu_get_dma_cookie(&domain->domain) != 0)
-			goto err_pgtable;
-	} else if (type != IOMMU_DOMAIN_UNMANAGED) {
-		goto err_pgtable;
-	}
-
 	domain->pgtable = (sysmmu_pte_t *)__get_free_pages(GFP_KERNEL, 2);
 	if (!domain->pgtable)
-		goto err_dma_cookie;
+		goto err_pgtable;
 
 	domain->lv2entcnt = (short *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 1);
 	if (!domain->lv2entcnt)
@@ -779,9 +774,6 @@ static struct iommu_domain *exynos_iommu_domain_alloc(unsigned type)
 	free_pages((unsigned long)domain->lv2entcnt, 1);
 err_counter:
 	free_pages((unsigned long)domain->pgtable, 2);
-err_dma_cookie:
-	if (type == IOMMU_DOMAIN_DMA)
-		iommu_put_dma_cookie(&domain->domain);
 err_pgtable:
 	kfree(domain);
 	return NULL;
@@ -809,9 +801,6 @@ static void exynos_iommu_domain_free(struct iommu_domain *iommu_domain)
 
 	spin_unlock_irqrestore(&domain->lock, flags);
 
-	if (iommu_domain->type == IOMMU_DOMAIN_DMA)
-		iommu_put_dma_cookie(iommu_domain);
-
 	dma_unmap_single(dma_dev, virt_to_phys(domain->pgtable), LV1TABLE_SIZE,
 			 DMA_TO_DEVICE);
 
-- 
2.25.1