From: Arto Merilainen amerilainen@nvidia.com
This patch adds CMA memory operations for host1x driver. This allows usage of CMA buffers inside host1x driver.
Signed-off-by: Arto Merilainen amerilainen@nvidia.com Signed-off-by: Terje Bergstrom tbergstrom@nvidia.com --- drivers/gpu/host1x/Makefile | 1 + drivers/gpu/host1x/drm/cma.c | 87 ++++++++++++++++++++++++++++++++++++++++++ drivers/gpu/host1x/drm/cma.h | 26 +++++++++++++ 3 files changed, 114 insertions(+) create mode 100644 drivers/gpu/host1x/drm/cma.c create mode 100644 drivers/gpu/host1x/drm/cma.h
diff --git a/drivers/gpu/host1x/Makefile b/drivers/gpu/host1x/Makefile index ad39fef..d1d7e35 100644 --- a/drivers/gpu/host1x/Makefile +++ b/drivers/gpu/host1x/Makefile @@ -16,4 +16,5 @@ ccflags-$(CONFIG_DRM_TEGRA_DEBUG) += -DDEBUG
host1x-$(CONFIG_DRM_TEGRA) += drm/drm.o drm/fb.o drm/dc.o host1x-$(CONFIG_DRM_TEGRA) += drm/output.o drm/rgb.o drm/hdmi.o +host1x-$(CONFIG_DRM_TEGRA) += drm/cma.o obj-$(CONFIG_TEGRA_HOST1X) += host1x.o diff --git a/drivers/gpu/host1x/drm/cma.c b/drivers/gpu/host1x/drm/cma.c new file mode 100644 index 0000000..1c5d000 --- /dev/null +++ b/drivers/gpu/host1x/drm/cma.c @@ -0,0 +1,87 @@ +/* + * Tegra host1x CMA support + * + * Copyright (c) 2012-2013, NVIDIA Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see http://www.gnu.org/licenses/. + */ + +#include <drm/drmP.h> +#include <drm/drm.h> +#include <drm/drm_gem_cma_helper.h> +#include <linux/mutex.h> + +#include "memmgr.h" + +static void cma_put(void *handle_data) +{ + struct drm_gem_cma_object *obj = handle_data; + struct drm_device *drm = obj->base.dev; + + mutex_lock(&drm->struct_mutex); + drm_gem_object_unreference(&obj->base); + mutex_unlock(&drm->struct_mutex); +} + +static dma_addr_t cma_pin(void *handle_data, struct sg_table **sgt) +{ + struct drm_gem_cma_object *obj = handle_data; + return obj->paddr; +} + +static void cma_unpin(void *handle_data, struct sg_table *sgt) +{ +} + +static void *cma_mmap(void *handle_data) +{ + struct drm_gem_cma_object *obj = handle_data; + return obj->vaddr; +} + +static void cma_munmap(void *handle_data, void *addr) +{ +} + +static void *cma_kmap(void *handle_data, unsigned int pagenum) +{ + struct drm_gem_cma_object *obj = handle_data; + return obj->vaddr + pagenum * PAGE_SIZE; +} + +static void cma_kunmap(void *handle_data, unsigned int pagenum, void *addr) +{ +} + +static struct host1x_mem_handle *cma_get(void *handle_data) +{ + struct drm_gem_cma_object *obj = handle_data; + struct drm_device *drm = obj->base.dev; + + mutex_lock(&drm->struct_mutex); + drm_gem_object_reference(&obj->base); + mutex_unlock(&drm->struct_mutex); + + return obj->base.driver_private; +} + +const struct host1x_mem_op host1x_cma_ops = { + .get = cma_get, + .put = cma_put, + .pin = cma_pin, + .unpin = cma_unpin, + .mmap = cma_mmap, + .munmap = cma_munmap, + .kmap = cma_kmap, + .kunmap = cma_kunmap, +}; diff --git a/drivers/gpu/host1x/drm/cma.h b/drivers/gpu/host1x/drm/cma.h new file mode 100644 index 0000000..06aa0ba --- /dev/null +++ b/drivers/gpu/host1x/drm/cma.h @@ -0,0 +1,26 @@ +/* + * Tegra host1x cma memory manager + * + * Copyright (c) 2012-2013, NVIDIA Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see http://www.gnu.org/licenses/. + */ + +#ifndef __HOST1X_CMA_H +#define __HOST1X_CMA_H + +#include "memmgr.h" + +extern const struct host1x_mem_op host1x_cma_ops; + +#endif