/* exynos_drm_buf.c * * Copyright (c) 2011 Samsung Electronics Co., Ltd. * Author: Inki Dae <inki.dae@samsung.com> * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. */ #include "drmP.h" #include "drm.h" #include "exynos_drm_drv.h" #include "exynos_drm_gem.h" #include "exynos_drm_buf.h" static int lowlevel_buffer_allocate(struct drm_device *dev, struct exynos_drm_gem_buf *buffer) { DRM_DEBUG_KMS("%s\n", __FILE__); buffer->kvaddr = dma_alloc_writecombine(dev->dev, buffer->size, &buffer->dma_addr, GFP_KERNEL); if (!buffer->kvaddr) { DRM_ERROR("failed to allocate buffer.\n"); return -ENOMEM; } DRM_DEBUG_KMS("vaddr(0x%lx), dma_addr(0x%lx), size(0x%lx)\n", (unsigned long)buffer->kvaddr, (unsigned long)buffer->dma_addr, buffer->size); return 0; } static void lowlevel_buffer_deallocate(struct drm_device *dev, struct exynos_drm_gem_buf *buffer) { DRM_DEBUG_KMS("%s.\n", __FILE__); if (buffer->dma_addr && buffer->size) dma_free_writecombine(dev->dev, buffer->size, buffer->kvaddr, (dma_addr_t)buffer->dma_addr); else DRM_DEBUG_KMS("buffer data are invalid.\n"); } struct exynos_drm_gem_buf *exynos_drm_buf_create(struct drm_device *dev, unsigned int size) { struct exynos_drm_gem_buf *buffer; DRM_DEBUG_KMS("%s.\n", __FILE__); DRM_DEBUG_KMS("desired size = 0x%x\n", size); buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); if (!buffer) { DRM_ERROR("failed to allocate exynos_drm_gem_buf.\n"); return NULL; } buffer->size = size; /* * allocate memory region with size and set the memory information * to vaddr and dma_addr of a buffer object. */ if (lowlevel_buffer_allocate(dev, buffer) < 0) { kfree(buffer); return NULL; } return buffer; } void exynos_drm_buf_destroy(struct drm_device *dev, struct exynos_drm_gem_buf *buffer) { DRM_DEBUG_KMS("%s.\n", __FILE__); if (!buffer) { DRM_DEBUG_KMS("buffer is null.\n"); return; } lowlevel_buffer_deallocate(dev, buffer); kfree(buffer); buffer = NULL; } MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>"); MODULE_DESCRIPTION("Samsung SoC DRM Buffer Management Module"); MODULE_LICENSE("GPL");