libcamera: internal: Move dma_heaps.[h, cpp] to common directories

DmaHeap class is useful outside the RPi pipeline handler too.

Move dma_heaps.h and dma_heaps.cpp to common directories. Update
the build files and RPi vc4 pipeline handler accordingly.

Tested-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org> # sc8280xp Lenovo x13s
Tested-by: Pavel Machek <pavel@ucw.cz>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Pavel Machek <pavel@ucw.cz>
Reviewed-by: Milan Zamazal <mzamazal@redhat.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Andrey Konovalov <andrey.konovalov@linaro.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

7 files changed, 128 insertions, 98 deletions

diff --git a/src/libcamera/pipeline/rpi/vc4/dma_heaps.h b/include/libcamera/internal/dma_heaps.h
index 0a4a8d86..cff8f140 100644
--- a/src/libcamera/pipeline/rpi/vc4/dma_heaps.h
+++ b/include/libcamera/internal/dma_heaps.h
@@ -13,8 +13,6 @@
 
 namespace libcamera {
 
-namespace RPi {
-
 class DmaHeap
 {
 public:
@@ -27,6 +25,4 @@ private:
 	UniqueFD dmaHeapHandle_;
 };
 
-} /* namespace RPi */
-
 } /* namespace libcamera */
diff --git a/include/libcamera/internal/meson.build b/include/libcamera/internal/meson.build
index 7f1f3440..33eb0fb3 100644
--- a/include/libcamera/internal/meson.build
+++ b/include/libcamera/internal/meson.build
@@ -25,6 +25,7 @@ libcamera_internal_headers = files([
     'device_enumerator.h',
     'device_enumerator_sysfs.h',
     'device_enumerator_udev.h',
+    'dma_heaps.h',
     'formats.h',
     'framebuffer.h',
     'ipa_manager.h',
diff --git a/src/libcamera/dma_heaps.cpp b/src/libcamera/dma_heaps.cpp
new file mode 100644
index 00000000..e543045d
--- /dev/null
+++ b/src/libcamera/dma_heaps.cpp
@@ -0,0 +1,124 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2020, Raspberry Pi Ltd
+ *
+ * dma_heaps.cpp - Helper class for dma-heap allocations.
+ */
+
+#include "libcamera/internal/dma_heaps.h"
+
+#include <array>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+
+#include <linux/dma-buf.h>
+#include <linux/dma-heap.h>
+
+#include <libcamera/base/log.h>
+
+/**
+ * \file dma_heaps.cpp
+ * \brief CMA dma-heap allocator
+ */
+
+/*
+ * /dev/dma_heap/linux,cma is the dma-heap allocator, which allows dmaheap-cma
+ * to only have to worry about importing.
+ *
+ * Annoyingly, should the cma heap size be specified on the kernel command line
+ * instead of DT, the heap gets named "reserved" instead.
+ */
+static constexpr std::array<const char *, 2> heapNames = {
+	"/dev/dma_heap/linux,cma",
+	"/dev/dma_heap/reserved"
+};
+
+namespace libcamera {
+
+LOG_DEFINE_CATEGORY(DmaHeap)
+
+/**
+ * \class DmaHeap
+ * \brief Helper class for CMA dma-heap allocations
+ */
+
+/**
+ * \brief Construct a DmaHeap that owns a CMA dma-heap file descriptor
+ *
+ * Looks for a CMA dma-heap device to use. If it fails to open any dma-heap
+ * device, an invalid DmaHeap object is constructed.
+ *
+ * Check the new DmaHeap object with isValid before using it.
+ */
+DmaHeap::DmaHeap()
+{
+	for (const char *name : heapNames) {
+		int ret = ::open(name, O_RDWR | O_CLOEXEC, 0);
+		if (ret < 0) {
+			ret = errno;
+			LOG(DmaHeap, Debug)
+				<< "Failed to open " << name << ": "
+				<< strerror(ret);
+			continue;
+		}
+
+		dmaHeapHandle_ = UniqueFD(ret);
+		break;
+	}
+
+	if (!dmaHeapHandle_.isValid())
+		LOG(DmaHeap, Error) << "Could not open any dmaHeap device";
+}
+
+/**
+ * \brief Destroy the DmaHeap instance
+ */
+DmaHeap::~DmaHeap() = default;
+
+/**
+ * \fn DmaHeap::isValid()
+ * \brief Check if the DmaHeap instance is valid
+ * \return True if the DmaHeap is valid, false otherwise
+ */
+
+/**
+ * \brief Allocate a dma-buf from the DmaHeap
+ * \param [in] name The name to set for the allocated buffer
+ * \param [in] size The size of the buffer to allocate
+ *
+ * Allocates a dma-buf with read/write access.
+ *
+ * If the allocation fails, return an invalid UniqueFD.
+ *
+ * \return The UniqueFD of the allocated buffer
+ */
+UniqueFD DmaHeap::alloc(const char *name, std::size_t size)
+{
+	int ret;
+
+	if (!name)
+		return {};
+
+	struct dma_heap_allocation_data alloc = {};
+
+	alloc.len = size;
+	alloc.fd_flags = O_CLOEXEC | O_RDWR;
+
+	ret = ::ioctl(dmaHeapHandle_.get(), DMA_HEAP_IOCTL_ALLOC, &alloc);
+	if (ret < 0) {
+		LOG(DmaHeap, Error) << "dmaHeap allocation failure for " << name;
+		return {};
+	}
+
+	UniqueFD allocFd(alloc.fd);
+	ret = ::ioctl(allocFd.get(), DMA_BUF_SET_NAME, name);
+	if (ret < 0) {
+		LOG(DmaHeap, Error) << "dmaHeap naming failure for " << name;
+		return {};
+	}
+
+	return allocFd;
+}
+
+} /* namespace libcamera */
diff --git a/src/libcamera/meson.build b/src/libcamera/meson.build
index 2e7b0c77..dd8107fa 100644
--- a/src/libcamera/meson.build
+++ b/src/libcamera/meson.build
@@ -15,6 +15,7 @@ libcamera_sources = files([
     'delayed_controls.cpp',
     'device_enumerator.cpp',
     'device_enumerator_sysfs.cpp',
+    'dma_heaps.cpp',
     'fence.cpp',
     'formats.cpp',
     'framebuffer.cpp',
diff --git a/src/libcamera/pipeline/rpi/vc4/dma_heaps.cpp b/src/libcamera/pipeline/rpi/vc4/dma_heaps.cpp
deleted file mode 100644
index 317b1fc1..00000000
--- a/src/libcamera/pipeline/rpi/vc4/dma_heaps.cpp
+++ /dev/null
@@ -1,90 +0,0 @@
-/* SPDX-License-Identifier: LGPL-2.1-or-later */
-/*
- * Copyright (C) 2020, Raspberry Pi Ltd
- *
- * dma_heaps.h - Helper class for dma-heap allocations.
- */
-
-#include "dma_heaps.h"
-
-#include <array>
-#include <fcntl.h>
-#include <linux/dma-buf.h>
-#include <linux/dma-heap.h>
-#include <sys/ioctl.h>
-#include <unistd.h>
-
-#include <libcamera/base/log.h>
-
-/*
- * /dev/dma-heap/linux,cma is the dma-heap allocator, which allows dmaheap-cma
- * to only have to worry about importing.
- *
- * Annoyingly, should the cma heap size be specified on the kernel command line
- * instead of DT, the heap gets named "reserved" instead.
- */
-static constexpr std::array<const char *, 2> heapNames = {
-	"/dev/dma_heap/linux,cma",
-	"/dev/dma_heap/reserved"
-};
-
-namespace libcamera {
-
-LOG_DECLARE_CATEGORY(RPI)
-
-namespace RPi {
-
-DmaHeap::DmaHeap()
-{
-	for (const char *name : heapNames) {
-		int ret = ::open(name, O_RDWR | O_CLOEXEC, 0);
-		if (ret < 0) {
-			ret = errno;
-			LOG(RPI, Debug) << "Failed to open " << name << ": "
-					<< strerror(ret);
-			continue;
-		}
-
-		dmaHeapHandle_ = UniqueFD(ret);
-		break;
-	}
-
-	if (!dmaHeapHandle_.isValid())
-		LOG(RPI, Error) << "Could not open any dmaHeap device";
-}
-
-DmaHeap::~DmaHeap() = default;
-
-UniqueFD DmaHeap::alloc(const char *name, std::size_t size)
-{
-	int ret;
-
-	if (!name)
-		return {};
-
-	struct dma_heap_allocation_data alloc = {};
-
-	alloc.len = size;
-	alloc.fd_flags = O_CLOEXEC | O_RDWR;
-
-	ret = ::ioctl(dmaHeapHandle_.get(), DMA_HEAP_IOCTL_ALLOC, &alloc);
-	if (ret < 0) {
-		LOG(RPI, Error) << "dmaHeap allocation failure for "
-				<< name;
-		return {};
-	}
-
-	UniqueFD allocFd(alloc.fd);
-	ret = ::ioctl(allocFd.get(), DMA_BUF_SET_NAME, name);
-	if (ret < 0) {
-		LOG(RPI, Error) << "dmaHeap naming failure for "
-				<< name;
-		return {};
-	}
-
-	return allocFd;
-}
-
-} /* namespace RPi */
-
-} /* namespace libcamera */
diff --git a/src/libcamera/pipeline/rpi/vc4/meson.build b/src/libcamera/pipeline/rpi/vc4/meson.build
index cdb049c5..386e2296 100644
--- a/src/libcamera/pipeline/rpi/vc4/meson.build
+++ b/src/libcamera/pipeline/rpi/vc4/meson.build
@@ -1,7 +1,6 @@
 # SPDX-License-Identifier: CC0-1.0
 
 libcamera_sources += files([
-    'dma_heaps.cpp',
     'vc4.cpp',
 ])
 
diff --git a/src/libcamera/pipeline/rpi/vc4/vc4.cpp b/src/libcamera/pipeline/rpi/vc4/vc4.cpp
index ad7dddde..947b1e73 100644
--- a/src/libcamera/pipeline/rpi/vc4/vc4.cpp
+++ b/src/libcamera/pipeline/rpi/vc4/vc4.cpp
@@ -12,12 +12,11 @@
 #include <libcamera/formats.h>
 
 #include "libcamera/internal/device_enumerator.h"
+#include "libcamera/internal/dma_heaps.h"
 
 #include "../common/pipeline_base.h"
 #include "../common/rpi_stream.h"
 
-#include "dma_heaps.h"
-
 using namespace std::chrono_literals;
 
 namespace libcamera {
@@ -87,7 +86,7 @@ public:
 	RPi::Device<Isp, 4> isp_;
 
 	/* DMAHEAP allocation helper. */
-	RPi::DmaHeap dmaHeap_;
+	DmaHeap dmaHeap_;
 	SharedFD lsTable_;
 
 	struct Config {