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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>,
	tfiga@chromium.org, bskeggs@redhat.com, bhelgaas@google.com,
	chris@chris-wilson.co.uk, tientzu@chromium.org, daniel@ffwll.ch,
	airlied@linux.ie, dri-devel@lists.freedesktop.org,
	intel-gfx@lists.freedesktop.org, jani.nikula@linux.intel.com,
	jxgao@google.com, joonas.lahtinen@linux.intel.com,
	linux-pci@vger.kernel.org, maarten.lankhorst@linux.intel.com,
	matthew.auld@intel.com, rodrigo.vivi@intel.com,
	thomas.hellstrom@linux.intel.com
Subject: [PATCH v9 14/14] of: Add plumbing for restricted DMA pool
Date: Fri, 11 Jun 2021 23:26:59 +0800
Message-ID: <20210611152659.2142983-15-tientzu@chromium.org> (raw)
In-Reply-To: <20210611152659.2142983-1-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    | 33 +++++++++++++++++++++++++++++++++
 drivers/of/device.c     |  3 +++
 drivers/of/of_private.h |  6 ++++++
 3 files changed, 42 insertions(+)

diff --git a/drivers/of/address.c b/drivers/of/address.c
index 3b2acca7e363..c8066d95ff0e 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>
@@ -1001,6 +1002,38 @@ int of_dma_get_range(struct device_node *np, const struct bus_dma_region **map)
 	of_node_put(node);
 	return ret;
 }
+
+int of_dma_set_restricted_buffer(struct device *dev, struct device_node *np)
+{
+	struct device_node *node, *of_node = dev->of_node;
+	int count, i;
+
+	count = of_property_count_elems_of_size(of_node, "memory-region",
+						sizeof(u32));
+	/*
+	 * If dev->of_node doesn't exist or doesn't contain memory-region, try
+	 * the OF node having DMA configuration.
+	 */
+	if (count <= 0) {
+		of_node = np;
+		count = of_property_count_elems_of_size(
+			of_node, "memory-region", sizeof(u32));
+	}
+
+	for (i = 0; i < count; i++) {
+		node = of_parse_phandle(of_node, "memory-region", i);
+		/*
+		 * There might be multiple memory regions, but only one
+		 * restricted-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, of_node,
+								  i);
+	}
+
+	return 0;
+}
 #endif /* CONFIG_HAS_DMA */
 
 /**
diff --git a/drivers/of/device.c b/drivers/of/device.c
index 1defdf15ba95..ba4656e77502 100644
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -168,6 +168,9 @@ int of_dma_configure_id(struct device *dev, struct device_node *np,
 	if (IS_ENABLED(CONFIG_SWIOTLB))
 		swiotlb_set_io_tlb_default_mem(dev);
 
+	if (!iommu)
+		return of_dma_set_restricted_buffer(dev, np);
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(of_dma_configure_id);
diff --git a/drivers/of/of_private.h b/drivers/of/of_private.h
index 631489f7f8c0..376462798f7e 100644
--- a/drivers/of/of_private.h
+++ b/drivers/of/of_private.h
@@ -163,12 +163,18 @@ 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, struct device_node *np);
 #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_set_restricted_buffer(struct device *dev,
+					       struct device_node *np)
+{
+	return -ENODEV;
+}
 #endif
 
 void fdt_init_reserved_mem(void);
-- 
2.32.0.272.g935e593368-goog


  parent reply index

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-11 15:26 [PATCH v9 00/14] Restricted DMA Claire Chang
2021-06-11 15:26 ` [PATCH v9 01/14] swiotlb: Refactor swiotlb init functions Claire Chang
2021-06-14  6:16   ` Christoph Hellwig
2021-06-15  4:06     ` Claire Chang
2021-06-11 15:26 ` [PATCH v9 02/14] swiotlb: Refactor swiotlb_create_debugfs Claire Chang
2021-06-14  6:17   ` Christoph Hellwig
2021-06-11 15:26 ` [PATCH v9 03/14] swiotlb: Set dev->dma_io_tlb_mem to the swiotlb pool used Claire Chang
2021-06-11 15:33   ` Claire Chang
2021-06-14  6:20     ` Christoph Hellwig
2021-06-11 15:26 ` [PATCH v9 04/14] swiotlb: Add restricted DMA pool initialization Claire Chang
2021-06-14  6:21   ` Christoph Hellwig
2021-06-11 15:26 ` [PATCH v9 05/14] swiotlb: Update is_swiotlb_buffer to add a struct device argument Claire Chang
2021-06-14  6:21   ` Christoph Hellwig
2021-06-11 15:26 ` [PATCH v9 06/14] swiotlb: Update is_swiotlb_active " Claire Chang
2021-06-11 15:34   ` Claire Chang
2021-06-14  6:23   ` Christoph Hellwig
2021-06-11 15:26 ` [PATCH v9 07/14] swiotlb: Bounce data from/to restricted DMA pool if available Claire Chang
2021-06-14  6:25   ` Christoph Hellwig
2021-06-11 15:26 ` [PATCH v9 08/14] swiotlb: Move alloc_size to find_slots Claire Chang
2021-06-14  6:25   ` Christoph Hellwig
2021-06-11 15:26 ` [PATCH v9 09/14] swiotlb: Refactor swiotlb_tbl_unmap_single Claire Chang
2021-06-14  6:26   ` Christoph Hellwig
2021-06-11 15:26 ` [PATCH v9 10/14] dma-direct: Add a new wrapper __dma_direct_free_pages() Claire Chang
2021-06-11 15:26 ` [PATCH v9 11/14] swiotlb: Add restricted DMA alloc/free support Claire Chang
2021-06-14  6:28   ` Christoph Hellwig
2021-06-14  6:28     ` Christoph Hellwig
2021-06-11 15:26 ` [PATCH v9 12/14] dma-direct: Allocate memory from restricted DMA pool if available Claire Chang
2021-06-11 15:26 ` [PATCH v9 13/14] dt-bindings: of: Add restricted DMA pool Claire Chang
2021-06-11 15:26 ` Claire Chang [this message]
2021-06-15 13:30 ` [PATCH v9 00/14] Restricted DMA Claire Chang

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