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From:   Claire Chang <tientzu@chromium.org>
To:     Rob Herring <robh+dt@kernel.org>, mpe@ellerman.id.au,
        Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>,
        Frank Rowand <frowand.list@gmail.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        boris.ostrovsky@oracle.com, jgross@suse.com,
        Christoph Hellwig <hch@lst.de>,
        Marek Szyprowski <m.szyprowski@samsung.com>
Cc:     benh@kernel.crashing.org, paulus@samba.org,
        "list@263.net:IOMMU DRIVERS" <iommu@lists.linux-foundation.org>,
        sstabellini@kernel.org, Robin Murphy <robin.murphy@arm.com>,
        grant.likely@arm.com, xypron.glpk@gmx.de,
        Thierry Reding <treding@nvidia.com>, mingo@kernel.org,
        bauerman@linux.ibm.com, peterz@infradead.org,
        Greg KH <gregkh@linuxfoundation.org>,
        Saravana Kannan <saravanak@google.com>,
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        heikki.krogerus@linux.intel.com,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Randy Dunlap <rdunlap@infradead.org>,
        Dan Williams <dan.j.williams@intel.com>,
        Bartosz Golaszewski <bgolaszewski@baylibre.com>,
        linux-devicetree <devicetree@vger.kernel.org>,
        lkml <linux-kernel@vger.kernel.org>,
        linuxppc-dev@lists.ozlabs.org, xen-devel@lists.xenproject.org,
        Nicolas Boichat <drinkcat@chromium.org>,
        Jim Quinlan <james.quinlan@broadcom.com>,
        Claire Chang <tientzu@chromium.org>
Subject: [PATCH v4 11/14] swiotlb: Add is_dev_swiotlb_force()
Date:   Tue,  9 Feb 2021 14:21:28 +0800
Message-Id: <20210209062131.2300005-12-tientzu@chromium.org>
In-Reply-To: <20210209062131.2300005-1-tientzu@chromium.org>
References: <20210209062131.2300005-1-tientzu@chromium.org>
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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@chromium.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