diff options
Diffstat (limited to 'drivers/gpu/drm/exynos/exynos_drm_buf.c')
| -rw-r--r-- | drivers/gpu/drm/exynos/exynos_drm_buf.c | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/drivers/gpu/drm/exynos/exynos_drm_buf.c b/drivers/gpu/drm/exynos/exynos_drm_buf.c new file mode 100644 index 0000000..57affae --- /dev/null +++ b/drivers/gpu/drm/exynos/exynos_drm_buf.c @@ -0,0 +1,200 @@ +/* exynos_drm_buf.c + * + * Copyright (c) 2011 Samsung Electronics Co., Ltd. + * Author: Inki Dae <inki.dae@samsung.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + */ + +#include <drm/drmP.h> +#include <drm/exynos_drm.h> + +#include "exynos_drm_drv.h" +#include "exynos_drm_gem.h" +#include "exynos_drm_buf.h" +#include "exynos_drm_iommu.h" + +static int lowlevel_buffer_allocate(struct drm_device *dev, + unsigned int flags, struct exynos_drm_gem_buf *buf) +{ + int ret = 0; + enum dma_attr attr; + unsigned int nr_pages; + + DRM_DEBUG_KMS("%s\n", __FILE__); + + if (buf->dma_addr) { + DRM_DEBUG_KMS("already allocated.\n"); + return 0; + } + + init_dma_attrs(&buf->dma_attrs); + + /* + * if EXYNOS_BO_CONTIG, fully physically contiguous memory + * region will be allocated else physically contiguous + * as possible. + */ + if (!(flags & EXYNOS_BO_NONCONTIG)) + dma_set_attr(DMA_ATTR_FORCE_CONTIGUOUS, &buf->dma_attrs); + + /* + * if EXYNOS_BO_WC or EXYNOS_BO_NONCACHABLE, writecombine mapping + * else cachable mapping. + */ + if (flags & EXYNOS_BO_WC || !(flags & EXYNOS_BO_CACHABLE)) + attr = DMA_ATTR_WRITE_COMBINE; + else + attr = DMA_ATTR_NON_CONSISTENT; + + dma_set_attr(attr, &buf->dma_attrs); + dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &buf->dma_attrs); + + nr_pages = buf->size >> PAGE_SHIFT; + + if (!is_drm_iommu_supported(dev)) { + dma_addr_t start_addr; + unsigned int i = 0; + + buf->pages = kzalloc(sizeof(struct page) * nr_pages, + GFP_KERNEL); + if (!buf->pages) { + DRM_ERROR("failed to allocate pages.\n"); + return -ENOMEM; + } + + buf->kvaddr = dma_alloc_attrs(dev->dev, buf->size, + &buf->dma_addr, GFP_KERNEL, + &buf->dma_attrs); + if (!buf->kvaddr) { + DRM_ERROR("failed to allocate buffer.\n"); + kfree(buf->pages); + return -ENOMEM; + } + + start_addr = buf->dma_addr; + while (i < nr_pages) { + buf->pages[i] = phys_to_page(start_addr); + start_addr += PAGE_SIZE; + i++; + } + } else { + + buf->pages = dma_alloc_attrs(dev->dev, buf->size, + &buf->dma_addr, GFP_KERNEL, + &buf->dma_attrs); + if (!buf->pages) { + DRM_ERROR("failed to allocate buffer.\n"); + return -ENOMEM; + } + } + + buf->sgt = drm_prime_pages_to_sg(buf->pages, nr_pages); + if (!buf->sgt) { + DRM_ERROR("failed to get sg table.\n"); + ret = -ENOMEM; + goto err_free_attrs; + } + + DRM_DEBUG_KMS("dma_addr(0x%lx), size(0x%lx)\n", + (unsigned long)buf->dma_addr, + buf->size); + + return ret; + +err_free_attrs: + dma_free_attrs(dev->dev, buf->size, buf->pages, + (dma_addr_t)buf->dma_addr, &buf->dma_attrs); + buf->dma_addr = (dma_addr_t)NULL; + + if (!is_drm_iommu_supported(dev)) + kfree(buf->pages); + + return ret; +} + +static void lowlevel_buffer_deallocate(struct drm_device *dev, + unsigned int flags, struct exynos_drm_gem_buf *buf) +{ + DRM_DEBUG_KMS("%s.\n", __FILE__); + + if (!buf->dma_addr) { + DRM_DEBUG_KMS("dma_addr is invalid.\n"); + return; + } + + DRM_DEBUG_KMS("dma_addr(0x%lx), size(0x%lx)\n", + (unsigned long)buf->dma_addr, + buf->size); + + sg_free_table(buf->sgt); + + kfree(buf->sgt); + buf->sgt = NULL; + + if (!is_drm_iommu_supported(dev)) { + dma_free_attrs(dev->dev, buf->size, buf->kvaddr, + (dma_addr_t)buf->dma_addr, &buf->dma_attrs); + kfree(buf->pages); + } else + dma_free_attrs(dev->dev, buf->size, buf->pages, + (dma_addr_t)buf->dma_addr, &buf->dma_attrs); + + buf->dma_addr = (dma_addr_t)NULL; +} + +struct exynos_drm_gem_buf *exynos_drm_init_buf(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; + return buffer; +} + +void exynos_drm_fini_buf(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; + } + + kfree(buffer); + buffer = NULL; +} + +int exynos_drm_alloc_buf(struct drm_device *dev, + struct exynos_drm_gem_buf *buf, unsigned int flags) +{ + + /* + * allocate memory region and set the memory information + * to vaddr and dma_addr of a buffer object. + */ + if (lowlevel_buffer_allocate(dev, flags, buf) < 0) + return -ENOMEM; + + return 0; +} + +void exynos_drm_free_buf(struct drm_device *dev, + unsigned int flags, struct exynos_drm_gem_buf *buffer) +{ + + lowlevel_buffer_deallocate(dev, flags, buffer); +} |