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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>,
	"Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
	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 14/14] of: Add plumbing for restricted DMA pool
Date: Tue,  9 Feb 2021 14:21:31 +0800	[thread overview]
Message-ID: <20210209062131.2300005-15-tientzu@chromium.org> (raw)
In-Reply-To: <20210209062131.2300005-1-tientzu@chromium.org>

If a device is not behind an IOMMU, we look up the device node and set
up the restricted DMA when the restricted-dma-pool is presented.

Signed-off-by: Claire Chang <tientzu@chromium.org>
---
 drivers/of/address.c    | 25 +++++++++++++++++++++++++
 drivers/of/device.c     |  3 +++
 drivers/of/of_private.h |  5 +++++
 3 files changed, 33 insertions(+)

diff --git a/drivers/of/address.c b/drivers/of/address.c
index 73ddf2540f3f..b6093c9b135d 100644
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -8,6 +8,7 @@
 #include <linux/logic_pio.h>
 #include <linux/module.h>
 #include <linux/of_address.h>
+#include <linux/of_reserved_mem.h>
 #include <linux/pci.h>
 #include <linux/pci_regs.h>
 #include <linux/sizes.h>
@@ -1094,3 +1095,27 @@ bool of_dma_is_coherent(struct device_node *np)
 	return false;
 }
 EXPORT_SYMBOL_GPL(of_dma_is_coherent);
+
+int of_dma_set_restricted_buffer(struct device *dev)
+{
+	struct device_node *node;
+	int count, i;
+
+	if (!dev->of_node)
+		return 0;
+
+	count = of_property_count_elems_of_size(dev->of_node, "memory-region",
+						sizeof(phandle));
+	for (i = 0; i < count; i++) {
+		node = of_parse_phandle(dev->of_node, "memory-region", i);
+		/* There might be multiple memory regions, but only one
+		 * restriced-dma-pool region is allowed.
+		 */
+		if (of_device_is_compatible(node, "restricted-dma-pool") &&
+		    of_device_is_available(node))
+			return of_reserved_mem_device_init_by_idx(
+				dev, dev->of_node, i);
+	}
+
+	return 0;
+}
diff --git a/drivers/of/device.c b/drivers/of/device.c
index 1122daa8e273..38c631f1fafa 100644
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -186,6 +186,9 @@ int of_dma_configure_id(struct device *dev, struct device_node *np,
 
 	arch_setup_dma_ops(dev, dma_start, size, iommu, coherent);
 
+	if (!iommu)
+		return of_dma_set_restricted_buffer(dev);
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(of_dma_configure_id);
diff --git a/drivers/of/of_private.h b/drivers/of/of_private.h
index d9e6a324de0a..28a2dfa197ba 100644
--- a/drivers/of/of_private.h
+++ b/drivers/of/of_private.h
@@ -161,12 +161,17 @@ struct bus_dma_region;
 #if defined(CONFIG_OF_ADDRESS) && defined(CONFIG_HAS_DMA)
 int of_dma_get_range(struct device_node *np,
 		const struct bus_dma_region **map);
+int of_dma_set_restricted_buffer(struct device *dev);
 #else
 static inline int of_dma_get_range(struct device_node *np,
 		const struct bus_dma_region **map)
 {
 	return -ENODEV;
 }
+static inline int of_dma_get_restricted_buffer(struct device *dev)
+{
+	return -ENODEV;
+}
 #endif
 
 #endif /* _LINUX_OF_PRIVATE_H */
-- 
2.30.0.478.g8a0d178c01-goog



  parent reply	other threads:[~2021-02-09  6:23 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-09  6:21 [PATCH v4 00/14] Restricted DMA Claire Chang
2021-02-09  6:21 ` [PATCH v4 01/14] swiotlb: Remove external access to io_tlb_start Claire Chang
2021-02-09  8:40   ` Christoph Hellwig
2021-02-09  6:21 ` [PATCH v4 02/14] swiotlb: Move is_swiotlb_buffer() to swiotlb.c Claire Chang
2021-02-09  6:21 ` [PATCH v4 03/14] swiotlb: Add struct swiotlb Claire Chang
2021-02-09  6:21 ` [PATCH v4 04/14] swiotlb: Refactor swiotlb_late_init_with_tbl Claire Chang
2021-02-09  6:21 ` [PATCH v4 05/14] swiotlb: Add DMA_RESTRICTED_POOL Claire Chang
2021-02-09  6:21 ` [PATCH v4 06/14] swiotlb: Add restricted DMA pool Claire Chang
2021-02-09  6:21 ` [PATCH v4 07/14] swiotlb: Update swiotlb API to gain a struct device argument Claire Chang
2021-02-09  6:21 ` [PATCH v4 08/14] swiotlb: Use restricted DMA pool if available Claire Chang
2021-02-09  6:21 ` [PATCH v4 09/14] swiotlb: Refactor swiotlb_tbl_{map,unmap}_single Claire Chang
2021-02-09  6:21 ` [PATCH v4 10/14] dma-direct: Add a new wrapper __dma_direct_free_pages() Claire Chang
2021-02-09  6:21 ` [PATCH v4 11/14] swiotlb: Add is_dev_swiotlb_force() Claire Chang
2021-02-09  6:21 ` [PATCH v4 12/14] swiotlb: Add restricted DMA alloc/free support Claire Chang
2021-02-26  4:17   ` Claire Chang
2021-02-26  5:17     ` Christoph Hellwig
2021-02-26  9:35       ` Claire Chang
2021-02-09  6:21 ` [PATCH v4 13/14] dt-bindings: of: Add restricted DMA pool Claire Chang
2021-03-10 16:07   ` Will Deacon
2021-03-10 21:40     ` Rob Herring
2021-03-11  5:04       ` Florian Fainelli
2021-02-09  6:21 ` Claire Chang [this message]
2021-04-22  8:20 ` [PATCH v4 00/14] Restricted DMA Claire Chang

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