Messages in this thread Patch in this message | | | From | John Stultz <> | Subject | [PATCH 1/2] ion: Add dummy driver for testing | Date | Thu, 9 Jan 2014 19:40:54 -0800 |
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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@android.com> Cc: Greg KH <gregkh@linuxfoundation.org> Cc: Jesse Barker <jesse.barker@arm.com> Cc: Android Kernel Team <kernel-team@android.com> Signed-off-by: John Stultz <john.stultz@linaro.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..a087b19 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 + tristate "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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