From: benjamin gaignard benjamin.gaignard@linaro.org
New heap, allocation is done with dma_alloc_coherent API. device coherent_dma_mask is set to DMA_BIT_MASK(32) Heap type isn't checked but we can think that ION_HEAP_TYPE_SYSTEM_CONTIG is the correct choice
Signed-off-by: Benjamin Gaignard benjamin.gaignard@linaro.org --- drivers/gpu/ion/Kconfig | 5 + drivers/gpu/ion/Makefile | 1 + drivers/gpu/ion/cma/Makefile | 1 + drivers/gpu/ion/cma/ion_cma_heap.c | 214 ++++++++++++++++++++++++++++++++++++ 4 files changed, 221 insertions(+), 0 deletions(-) create mode 100644 drivers/gpu/ion/cma/Makefile create mode 100644 drivers/gpu/ion/cma/ion_cma_heap.c
diff --git a/drivers/gpu/ion/Kconfig b/drivers/gpu/ion/Kconfig index 5b48b4e..231dbb1 100644 --- a/drivers/gpu/ion/Kconfig +++ b/drivers/gpu/ion/Kconfig @@ -10,3 +10,8 @@ config ION_TEGRA help Choose this option if you wish to use ion on an nVidia Tegra.
+config ION_CMA + tristate "Ion CMA heap" + depends on ION && CMA + help + Choose this option to enable ION CMA heap. diff --git a/drivers/gpu/ion/Makefile b/drivers/gpu/ion/Makefile index 73fe3fa..05f174a 100644 --- a/drivers/gpu/ion/Makefile +++ b/drivers/gpu/ion/Makefile @@ -1,2 +1,3 @@ obj-$(CONFIG_ION) += ion.o ion_heap.o ion_system_heap.o ion_carveout_heap.o obj-$(CONFIG_ION_TEGRA) += tegra/ +obj-$(CONFIG_ION_CMA) += cma/ diff --git a/drivers/gpu/ion/cma/Makefile b/drivers/gpu/ion/cma/Makefile new file mode 100644 index 0000000..673508d --- /dev/null +++ b/drivers/gpu/ion/cma/Makefile @@ -0,0 +1 @@ +obj-y += ion_cma_heap.o diff --git a/drivers/gpu/ion/cma/ion_cma_heap.c b/drivers/gpu/ion/cma/ion_cma_heap.c new file mode 100644 index 0000000..79c68af --- /dev/null +++ b/drivers/gpu/ion/cma/ion_cma_heap.c @@ -0,0 +1,214 @@ +/* + * drivers/gpu/ion/ion_cma_heap.c + * + * + * 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/device.h> +#include <linux/ion.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/errno.h> +#include <linux/err.h> +#include <linux/miscdevice.h> + +/* for ion_heap_ops structure */ +#include "../ion_priv.h" + +#include <linux/dma-mapping.h> + +#define ION_CMA_ALLOCATE_FAILED -1 + +static u64 dma_mask = 0xffffffffULL; + +struct ion_heap **heaps; +struct ion_device *ion_cma_device; + +struct ion_cma_buffer_info { + void *cpu_addr; + dma_addr_t handle; +}; + +/* ION CMA heap operations functions */ +int ion_cma_allocate(struct ion_heap *heap, struct ion_buffer *buffer, + unsigned long len, unsigned long align, + unsigned long flags) +{ + struct ion_device *idev = heap->dev; + struct device *dev = idev->dev.parent; + struct ion_cma_buffer_info *info; + + dev_dbg(dev, "Request buffer allocation len %ld\n", len); + + info = kzalloc(sizeof(struct ion_cma_buffer_info), GFP_KERNEL); + if (!info) { + dev_err(dev, "Can't allocate buffer info\n"); + return ION_CMA_ALLOCATE_FAILED; + } + + info->cpu_addr = dma_alloc_coherent(dev, len, &(info->handle), 0); + + if (!info->cpu_addr) { + dev_err(dev, "Fail to allocate buffer\n"); + kfree(info); + return ION_CMA_ALLOCATE_FAILED; + } + + /* keep this for memory release */ + buffer->priv_virt = info; + dev_dbg(dev, "Allocate buffer %p\n", buffer); + return 0; +} + +void ion_cma_free(struct ion_buffer *buffer) +{ + struct ion_device *idev = buffer->dev; + struct device *dev = idev->dev.parent; + struct ion_cma_buffer_info *info = buffer->priv_virt; + + dev_dbg(dev, "Release buffer %p\n", buffer); + dma_free_coherent(dev, buffer->size, info->cpu_addr, info->handle); + kfree(info); +} + +/* return physical address in addr */ +int ion_cma_phys(struct ion_heap *heap, struct ion_buffer *buffer, + ion_phys_addr_t *addr, size_t *len) +{ + struct ion_device *idev = buffer->dev; + struct device *dev = idev->dev.parent; + struct ion_cma_buffer_info *info = buffer->priv_virt; + + dev_dbg(dev, "Return buffer %p physical address 0x%x\n", buffer, + virt_to_phys(info->cpu_addr)); + *addr = virt_to_phys(info->cpu_addr); + *len = buffer->size; + return 0; +} + +int ion_cma_mmap(struct ion_heap *mapper, struct ion_buffer *buffer, + struct vm_area_struct *vma) +{ + struct ion_device *idev = buffer->dev; + struct device *dev = idev->dev.parent; + struct ion_cma_buffer_info *info = buffer->priv_virt; + + return dma_mmap_coherent(dev, vma, info->cpu_addr, info->handle, + buffer->size); +} + +static struct ion_heap_ops ion_cma_ops = { + .allocate = ion_cma_allocate, + .free = ion_cma_free, + .phys = ion_cma_phys, + .map_user = ion_cma_mmap, +}; + +struct ion_heap *ion_cma_heap_create(struct ion_platform_heap *data) +{ + struct ion_heap *heap; + + heap = ion_heap_create(data); + if (!heap) + return NULL; + heap->ops = &ion_cma_ops; + return heap; +} + +/* ION CMA heap platform driver functions */ +int ion_cma_probe(struct platform_device *pdev) +{ + struct ion_platform_data *pdata = pdev->dev.platform_data; + int num_heaps = pdata->nr; + int i, err; + + heaps = kzalloc(sizeof(struct ion_heap *) * num_heaps, GFP_KERNEL); + + dev_info(&pdev->dev, "Create ION CMA device %p\n", &pdev->dev); + ion_cma_device = ion_device_create(NULL); + if (IS_ERR_OR_NULL(ion_cma_device)) { + kfree(heaps); + dev_err(&pdev->dev, "Can't create ION CMA device\n"); + return PTR_ERR(ion_cma_device); + } + + ion_cma_device->dev.parent = &(pdev->dev); + + /* set dma mask for this device */ + pdev->dev.dma_mask = &dma_mask; + pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32); + + /* create all the heaps specified in board configuration file */ + for (i = 0; i < num_heaps; i++) { + struct ion_platform_heap *heap_data = &pdata->heaps[i]; + + heaps[i] = ion_cma_heap_create(heap_data); + if (IS_ERR_OR_NULL(heaps[i])) { + dev_err(&pdev->dev, "Can't create heap %s\n", + heap_data->name); + err = PTR_ERR(heaps[i]); + goto err; + } + ion_device_add_heap(ion_cma_device, heaps[i]); + dev_dbg(&pdev->dev, "Add heap %s\n", heap_data->name); + } + + platform_set_drvdata(pdev, ion_cma_device); + return 0; + +err: + for (i = 0; i < num_heaps; i++) { + if (heaps[i]) + ion_heap_destroy(heaps[i]); + } + kfree(heaps); + return err; +} + +int ion_cma_remove(struct platform_device *pdev) +{ + struct ion_device *idev = platform_get_drvdata(pdev); + struct ion_platform_data *pdata = pdev->dev.platform_data; + int i, num_heaps; + + num_heaps = pdata->nr; + + /* remove ION device */ + ion_device_destroy(idev); + + /* remove all heaps create by the driver */ + for (i = 0; i < num_heaps; i++) { + if (heaps[i]) + ion_heap_destroy(heaps[i]); + } + return 0; +} + +static struct platform_driver ion_cma_driver = { + .probe = ion_cma_probe, + .remove = ion_cma_remove, + .driver = { + .name = "ion-cma"} +}; + +static int __init ion_cma_init(void) +{ + return platform_driver_register(&ion_cma_driver); +} + +static void __exit ion_cma_exit(void) +{ + platform_driver_unregister(&ion_cma_driver); +} + +module_init(ion_cma_init); +module_exit(ion_cma_exit);