linux-kernel - [PATCH v4 11/14] swiotlb: Add is_dev_swiotlb

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Date:   Tue,  9 Feb 2021 14:21:28 +0800
From:   Claire Chang <tientzu@...omium.org>
To:     Rob Herring <robh+dt@...nel.org>, mpe@...erman.id.au,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        boris.ostrovsky@...cle.com, jgross@...e.com,
        Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     benh@...nel.crashing.org, paulus@...ba.org,
        "list@....net:IOMMU DRIVERS" <iommu@...ts.linux-foundation.org>,
        sstabellini@...nel.org, Robin Murphy <robin.murphy@....com>,
        grant.likely@....com, xypron.glpk@....de,
        Thierry Reding <treding@...dia.com>, mingo@...nel.org,
        bauerman@...ux.ibm.com, peterz@...radead.org,
        Greg KH <gregkh@...uxfoundation.org>,
        Saravana Kannan <saravanak@...gle.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        heikki.krogerus@...ux.intel.com,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        linux-devicetree <devicetree@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        linuxppc-dev@...ts.ozlabs.org, xen-devel@...ts.xenproject.org,
        Nicolas Boichat <drinkcat@...omium.org>,
        Jim Quinlan <james.quinlan@...adcom.com>,
        Claire Chang <tientzu@...omium.org>
Subject: [PATCH v4 11/14] swiotlb: Add is_dev_swiotlb_force()

Add is_dev_swiotlb_force() which returns true if the device has
restricted DMA pool (e.g. dev->dev_swiotlb is set).

Signed-off-by: Claire Chang <tientzu@...omium.org>
---
 include/linux/swiotlb.h | 9 +++++++++
 kernel/dma/swiotlb.c    | 5 +++++
 2 files changed, 14 insertions(+)

diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index 76f86c684524..b9f2a250c8da 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -73,11 +73,16 @@ extern enum swiotlb_force swiotlb_force;
 
 #ifdef CONFIG_DMA_RESTRICTED_POOL
 bool is_swiotlb_force(struct device *dev);
+bool is_dev_swiotlb_force(struct device *dev);
 #else
 static inline bool is_swiotlb_force(struct device *dev)
 {
 	return unlikely(swiotlb_force == SWIOTLB_FORCE);
 }
+static inline bool is_dev_swiotlb_force(struct device *dev)
+{
+	return false;
+}
 #endif /* CONFIG_DMA_RESTRICTED_POOL */
 
 bool is_swiotlb_buffer(struct device *dev, phys_addr_t paddr);
@@ -93,6 +98,10 @@ static inline bool is_swiotlb_force(struct device *dev)
 {
 	return false;
 }
+static inline bool is_dev_swiotlb_force(struct device *dev)
+{
+	return false;
+}
 static inline bool is_swiotlb_buffer(struct device *dev, phys_addr_t paddr)
 {
 	return false;
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index f64cbe6e84cc..fd9c1bd183ac 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -841,6 +841,11 @@ bool is_swiotlb_force(struct device *dev)
 	return unlikely(swiotlb_force == SWIOTLB_FORCE) || dev->dev_swiotlb;
 }
 
+bool is_dev_swiotlb_force(struct device *dev)
+{
+	return dev->dev_swiotlb;
+}
+
 static int rmem_swiotlb_device_init(struct reserved_mem *rmem,
 				    struct device *dev)
 {
-- 
2.30.0.478.g8a0d178c01-goog