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From: Robin Murphy <robin.murphy@arm.com>
To: joro@8bytes.org, will@kernel.org
Cc: iommu@lists.linux-foundation.org, linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/2] iommu/dma: Unexport IOVA cookie management
Date: Mon, 13 Sep 2021 13:40:06 +0100	[thread overview]
Message-ID: <ef89db54a27df7d8bc0af094c7d7b204fd61774c.1631531973.git.robin.murphy@arm.com> (raw)
In-Reply-To: <cover.1631531973.git.robin.murphy@arm.com>

IOVA cookies are now got and put by core code, so we no longer need to
export these to modular drivers. The export for getting MSI cookies
stays, since VFIO can still be a module, but it was already relying on
someone else putting them, so that aspect is unaffected.

Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
 drivers/iommu/dma-iommu.c | 7 -------
 drivers/iommu/iommu.c     | 3 +--
 2 files changed, 1 insertion(+), 9 deletions(-)

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 896bea04c347..26cb95d3830a 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -98,9 +98,6 @@ static struct iommu_dma_cookie *cookie_alloc(enum iommu_dma_cookie_type type)
 /**
  * iommu_get_dma_cookie - Acquire DMA-API resources for a domain
  * @domain: IOMMU domain to prepare for DMA-API usage
- *
- * IOMMU drivers should normally call this from their domain_alloc
- * callback when domain->type == IOMMU_DOMAIN_DMA.
  */
 int iommu_get_dma_cookie(struct iommu_domain *domain)
 {
@@ -113,7 +110,6 @@ int iommu_get_dma_cookie(struct iommu_domain *domain)
 
 	return 0;
 }
-EXPORT_SYMBOL(iommu_get_dma_cookie);
 
 /**
  * iommu_get_msi_cookie - Acquire just MSI remapping resources
@@ -151,8 +147,6 @@ EXPORT_SYMBOL(iommu_get_msi_cookie);
  * iommu_put_dma_cookie - Release a domain's DMA mapping resources
  * @domain: IOMMU domain previously prepared by iommu_get_dma_cookie() or
  *          iommu_get_msi_cookie()
- *
- * IOMMU drivers should normally call this from their domain_free callback.
  */
 void iommu_put_dma_cookie(struct iommu_domain *domain)
 {
@@ -172,7 +166,6 @@ void iommu_put_dma_cookie(struct iommu_domain *domain)
 	kfree(cookie);
 	domain->iova_cookie = NULL;
 }
-EXPORT_SYMBOL(iommu_put_dma_cookie);
 
 /**
  * iommu_dma_get_resv_regions - Reserved region driver helper
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 3303d707bab4..a80f13867bed 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1953,8 +1953,7 @@ static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus,
 	/* Assume all sizes by default; the driver may override this later */
 	domain->pgsize_bitmap  = bus->iommu_ops->pgsize_bitmap;
 
-	/* Temporarily avoid -EEXIST while drivers still get their own cookies */
-	if (iommu_is_dma_domain(domain) && !domain->iova_cookie && iommu_get_dma_cookie(domain)) {
+	if (iommu_is_dma_domain(domain) && iommu_get_dma_cookie(domain)) {
 		iommu_domain_free(domain);
 		domain = NULL;
 	}
-- 
2.25.1

_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

WARNING: multiple messages have this Message-ID (diff)
From: Robin Murphy <robin.murphy@arm.com>
To: joro@8bytes.org, will@kernel.org
Cc: iommu@lists.linux-foundation.org, linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/2] iommu/dma: Unexport IOVA cookie management
Date: Mon, 13 Sep 2021 13:40:06 +0100	[thread overview]
Message-ID: <ef89db54a27df7d8bc0af094c7d7b204fd61774c.1631531973.git.robin.murphy@arm.com> (raw)
In-Reply-To: <cover.1631531973.git.robin.murphy@arm.com>

IOVA cookies are now got and put by core code, so we no longer need to
export these to modular drivers. The export for getting MSI cookies
stays, since VFIO can still be a module, but it was already relying on
someone else putting them, so that aspect is unaffected.

Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
 drivers/iommu/dma-iommu.c | 7 -------
 drivers/iommu/iommu.c     | 3 +--
 2 files changed, 1 insertion(+), 9 deletions(-)

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 896bea04c347..26cb95d3830a 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -98,9 +98,6 @@ static struct iommu_dma_cookie *cookie_alloc(enum iommu_dma_cookie_type type)
 /**
  * iommu_get_dma_cookie - Acquire DMA-API resources for a domain
  * @domain: IOMMU domain to prepare for DMA-API usage
- *
- * IOMMU drivers should normally call this from their domain_alloc
- * callback when domain->type == IOMMU_DOMAIN_DMA.
  */
 int iommu_get_dma_cookie(struct iommu_domain *domain)
 {
@@ -113,7 +110,6 @@ int iommu_get_dma_cookie(struct iommu_domain *domain)
 
 	return 0;
 }
-EXPORT_SYMBOL(iommu_get_dma_cookie);
 
 /**
  * iommu_get_msi_cookie - Acquire just MSI remapping resources
@@ -151,8 +147,6 @@ EXPORT_SYMBOL(iommu_get_msi_cookie);
  * iommu_put_dma_cookie - Release a domain's DMA mapping resources
  * @domain: IOMMU domain previously prepared by iommu_get_dma_cookie() or
  *          iommu_get_msi_cookie()
- *
- * IOMMU drivers should normally call this from their domain_free callback.
  */
 void iommu_put_dma_cookie(struct iommu_domain *domain)
 {
@@ -172,7 +166,6 @@ void iommu_put_dma_cookie(struct iommu_domain *domain)
 	kfree(cookie);
 	domain->iova_cookie = NULL;
 }
-EXPORT_SYMBOL(iommu_put_dma_cookie);
 
 /**
  * iommu_dma_get_resv_regions - Reserved region driver helper
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 3303d707bab4..a80f13867bed 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1953,8 +1953,7 @@ static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus,
 	/* Assume all sizes by default; the driver may override this later */
 	domain->pgsize_bitmap  = bus->iommu_ops->pgsize_bitmap;
 
-	/* Temporarily avoid -EEXIST while drivers still get their own cookies */
-	if (iommu_is_dma_domain(domain) && !domain->iova_cookie && iommu_get_dma_cookie(domain)) {
+	if (iommu_is_dma_domain(domain) && iommu_get_dma_cookie(domain)) {
 		iommu_domain_free(domain);
 		domain = NULL;
 	}
-- 
2.25.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2021-09-13 12:40 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-13 12:40 [PATCH 0/2] iommu: DMA domain epilogue Robin Murphy
2021-09-13 12:40 ` Robin Murphy
2021-09-13 12:40 ` [PATCH 1/2] iommu/dart: Clean up IOVA cookie crumbs Robin Murphy
2021-09-13 12:40   ` Robin Murphy
2021-09-13 12:40 ` Robin Murphy [this message]
2021-09-13 12:40   ` [PATCH 2/2] iommu/dma: Unexport IOVA cookie management Robin Murphy
2021-09-28  9:21 ` [PATCH 0/2] iommu: DMA domain epilogue Joerg Roedel
2021-09-28  9:21   ` Joerg Roedel

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