3 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
4 * Author: Inki Dae <inki.dae@samsung.com>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
13 #include <drm/exynos_drm.h>
15 #include "exynos_drm_drv.h"
16 #include "exynos_drm_gem.h"
17 #include "exynos_drm_buf.h"
18 #include "exynos_drm_iommu.h"
20 static int lowlevel_buffer_allocate(struct drm_device *dev,
21 unsigned int flags, struct exynos_drm_gem_buf *buf)
25 unsigned int nr_pages;
27 DRM_DEBUG_KMS("%s\n", __FILE__);
30 DRM_DEBUG_KMS("already allocated.\n");
34 init_dma_attrs(&buf->dma_attrs);
37 * if EXYNOS_BO_CONTIG, fully physically contiguous memory
38 * region will be allocated else physically contiguous
41 if (!(flags & EXYNOS_BO_NONCONTIG))
42 dma_set_attr(DMA_ATTR_FORCE_CONTIGUOUS, &buf->dma_attrs);
45 * if EXYNOS_BO_WC or EXYNOS_BO_NONCACHABLE, writecombine mapping
46 * else cachable mapping.
48 if (flags & EXYNOS_BO_WC || !(flags & EXYNOS_BO_CACHABLE))
49 attr = DMA_ATTR_WRITE_COMBINE;
51 attr = DMA_ATTR_NON_CONSISTENT;
53 dma_set_attr(attr, &buf->dma_attrs);
54 dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &buf->dma_attrs);
56 nr_pages = buf->size >> PAGE_SHIFT;
58 if (!is_drm_iommu_supported(dev)) {
59 dma_addr_t start_addr;
62 buf->pages = kzalloc(sizeof(struct page) * nr_pages,
65 DRM_ERROR("failed to allocate pages.\n");
69 buf->kvaddr = dma_alloc_attrs(dev->dev, buf->size,
70 &buf->dma_addr, GFP_KERNEL,
73 DRM_ERROR("failed to allocate buffer.\n");
78 start_addr = buf->dma_addr;
79 while (i < nr_pages) {
80 buf->pages[i] = phys_to_page(start_addr);
81 start_addr += PAGE_SIZE;
86 buf->pages = dma_alloc_attrs(dev->dev, buf->size,
87 &buf->dma_addr, GFP_KERNEL,
90 DRM_ERROR("failed to allocate buffer.\n");
95 buf->sgt = drm_prime_pages_to_sg(buf->pages, nr_pages);
97 DRM_ERROR("failed to get sg table.\n");
102 DRM_DEBUG_KMS("dma_addr(0x%lx), size(0x%lx)\n",
103 (unsigned long)buf->dma_addr,
109 dma_free_attrs(dev->dev, buf->size, buf->pages,
110 (dma_addr_t)buf->dma_addr, &buf->dma_attrs);
111 buf->dma_addr = (dma_addr_t)NULL;
113 if (!is_drm_iommu_supported(dev))
119 static void lowlevel_buffer_deallocate(struct drm_device *dev,
120 unsigned int flags, struct exynos_drm_gem_buf *buf)
122 DRM_DEBUG_KMS("%s.\n", __FILE__);
124 if (!buf->dma_addr) {
125 DRM_DEBUG_KMS("dma_addr is invalid.\n");
129 DRM_DEBUG_KMS("dma_addr(0x%lx), size(0x%lx)\n",
130 (unsigned long)buf->dma_addr,
133 sg_free_table(buf->sgt);
138 if (!is_drm_iommu_supported(dev)) {
139 dma_free_attrs(dev->dev, buf->size, buf->kvaddr,
140 (dma_addr_t)buf->dma_addr, &buf->dma_attrs);
143 dma_free_attrs(dev->dev, buf->size, buf->pages,
144 (dma_addr_t)buf->dma_addr, &buf->dma_attrs);
146 buf->dma_addr = (dma_addr_t)NULL;
149 struct exynos_drm_gem_buf *exynos_drm_init_buf(struct drm_device *dev,
152 struct exynos_drm_gem_buf *buffer;
154 DRM_DEBUG_KMS("%s.\n", __FILE__);
155 DRM_DEBUG_KMS("desired size = 0x%x\n", size);
157 buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
159 DRM_ERROR("failed to allocate exynos_drm_gem_buf.\n");
167 void exynos_drm_fini_buf(struct drm_device *dev,
168 struct exynos_drm_gem_buf *buffer)
170 DRM_DEBUG_KMS("%s.\n", __FILE__);
173 DRM_DEBUG_KMS("buffer is null.\n");
181 int exynos_drm_alloc_buf(struct drm_device *dev,
182 struct exynos_drm_gem_buf *buf, unsigned int flags)
186 * allocate memory region and set the memory information
187 * to vaddr and dma_addr of a buffer object.
189 if (lowlevel_buffer_allocate(dev, flags, buf) < 0)
195 void exynos_drm_free_buf(struct drm_device *dev,
196 unsigned int flags, struct exynos_drm_gem_buf *buffer)
199 lowlevel_buffer_deallocate(dev, flags, buffer);