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Message-Id: <1389330518-31919-2-git-send-email-john.stultz@linaro.org>
Date: Thu, 9 Jan 2014 21:08:37 -0800
From: John Stultz <john.stultz@...aro.org>
To: LKML <linux-kernel@...r.kernel.org>
Cc: John Stultz <john.stultz@...aro.org>,
Colin Cross <ccross@...roid.com>,
Greg KH <gregkh@...uxfoundation.org>,
Jesse Barker <jesse.barker@....com>,
Android Kernel Team <kernel-team@...roid.com>
Subject: [PATCH 1/2] ion: Add dummy driver for testing
Provide a basic dummy driver to register the ion device
and to install basic SYSTEM and SYSTEM_CONTIG heaps.
This allows for basic testing with ION without having
access to drivers or systems that have been enabled to use
ION.
Cc: Colin Cross <ccross@...roid.com>
Cc: Greg KH <gregkh@...uxfoundation.org>
Cc: Jesse Barker <jesse.barker@....com>
Cc: Android Kernel Team <kernel-team@...roid.com>
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
drivers/staging/android/ion/Kconfig | 10 +++
drivers/staging/android/ion/Makefile | 3 +
drivers/staging/android/ion/ion_dummy_driver.c | 93 ++++++++++++++++++++++++++
3 files changed, 106 insertions(+)
create mode 100644 drivers/staging/android/ion/ion_dummy_driver.c
diff --git a/drivers/staging/android/ion/Kconfig b/drivers/staging/android/ion/Kconfig
index a9a64ea..0f8fec1 100644
--- a/drivers/staging/android/ion/Kconfig
+++ b/drivers/staging/android/ion/Kconfig
@@ -17,6 +17,16 @@ config ION_TEST
Choose this option to create a device that can be used to test the
kernel and device side ION functions.
+config ION_DUMMY
+ bool "Dummy Ion driver"
+ depends on ION
+ help
+ Provides a dummy ION driver that registers the
+ /dev/ion device and some basic heaps. This can
+ be used for testing the ION infrastructure if
+ one doesn't have access to hardware drivers that
+ use ION.
+
config ION_TEGRA
tristate "Ion for Tegra"
depends on ARCH_TEGRA && ION
diff --git a/drivers/staging/android/ion/Makefile b/drivers/staging/android/ion/Makefile
index 75039b9..b56fd2b 100644
--- a/drivers/staging/android/ion/Makefile
+++ b/drivers/staging/android/ion/Makefile
@@ -4,4 +4,7 @@ obj-$(CONFIG_ION_TEST) += ion_test.o
ifdef CONFIG_COMPAT
obj-$(CONFIG_ION) += compat_ion.o
endif
+
+obj-$(CONFIG_ION_DUMMY) += ion_dummy_driver.o
obj-$(CONFIG_ION_TEGRA) += tegra/
+
diff --git a/drivers/staging/android/ion/ion_dummy_driver.c b/drivers/staging/android/ion/ion_dummy_driver.c
new file mode 100644
index 0000000..6749d29
--- /dev/null
+++ b/drivers/staging/android/ion/ion_dummy_driver.c
@@ -0,0 +1,93 @@
+/*
+ * drivers/gpu/ion/ion_dummy_driver.c
+ *
+ * Copyright (C) 2013 Linaro, Inc
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/bootmem.h>
+#include <linux/memblock.h>
+#include <linux/sizes.h>
+#include "ion.h"
+#include "ion_priv.h"
+
+struct ion_device *idev;
+struct ion_heap **heaps;
+
+struct ion_platform_heap dummy_heaps[] = {
+ {
+ .id = ION_HEAP_TYPE_SYSTEM,
+ .type = ION_HEAP_TYPE_SYSTEM,
+ .name = "system",
+ },
+ {
+ .id = ION_HEAP_TYPE_SYSTEM_CONTIG,
+ .type = ION_HEAP_TYPE_SYSTEM_CONTIG,
+ .name = "system contig",
+ },
+};
+
+struct ion_platform_data dummy_ion_pdata = {
+ .nr = 2,
+ .heaps = dummy_heaps,
+};
+
+static int __init ion_dummy_init(void)
+{
+ int i, err;
+
+ idev = ion_device_create(NULL);
+ heaps = kzalloc(sizeof(struct ion_heap *) * dummy_ion_pdata.nr,
+ GFP_KERNEL);
+ if (!heaps)
+ return PTR_ERR(heaps);
+
+ for (i = 0; i < dummy_ion_pdata.nr; i++) {
+ struct ion_platform_heap *heap_data = &dummy_ion_pdata.heaps[i];
+
+ heaps[i] = ion_heap_create(heap_data);
+ if (IS_ERR_OR_NULL(heaps[i])) {
+ err = PTR_ERR(heaps[i]);
+ goto err;
+ }
+ ion_device_add_heap(idev, heaps[i]);
+ }
+ return 0;
+err:
+ for (i = 0; i < dummy_ion_pdata.nr; i++) {
+ if (heaps[i])
+ ion_heap_destroy(heaps[i]);
+ }
+ kfree(heaps);
+
+ return err;
+}
+
+static void __exit ion_dummy_exit(void)
+{
+ int i;
+
+ ion_device_destroy(idev);
+
+ for (i = 0; i < dummy_ion_pdata.nr; i++)
+ ion_heap_destroy(heaps[i]);
+ kfree(heaps);
+
+ return;
+}
+
+module_init(ion_dummy_init);
+module_exit(ion_dummy_exit);
+
--
1.8.3.2
--
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