Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 1 | /* exynos_drm_buf.c |
| 2 | * |
| 3 | * Copyright (c) 2011 Samsung Electronics Co., Ltd. |
| 4 | * Author: Inki Dae <inki.dae@samsung.com> |
| 5 | * |
Inki Dae | d81aecb | 2012-12-18 02:30:17 +0900 | [diff] [blame^] | 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. |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 10 | */ |
| 11 | |
David Howells | 760285e | 2012-10-02 18:01:07 +0100 | [diff] [blame] | 12 | #include <drm/drmP.h> |
| 13 | #include <drm/exynos_drm.h> |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 14 | |
| 15 | #include "exynos_drm_drv.h" |
Inki Dae | 2c87112 | 2011-11-12 15:23:32 +0900 | [diff] [blame] | 16 | #include "exynos_drm_gem.h" |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 17 | #include "exynos_drm_buf.h" |
| 18 | |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 19 | static int lowlevel_buffer_allocate(struct drm_device *dev, |
Inki Dae | 2b35892 | 2012-03-16 18:47:05 +0900 | [diff] [blame] | 20 | unsigned int flags, struct exynos_drm_gem_buf *buf) |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 21 | { |
Inki Dae | 0519f9a | 2012-10-20 07:53:42 -0700 | [diff] [blame] | 22 | int ret = 0; |
Inki Dae | 1169af21 | 2012-12-14 14:34:31 +0900 | [diff] [blame] | 23 | enum dma_attr attr; |
Inki Dae | 4744ad2 | 2012-12-07 17:51:27 +0900 | [diff] [blame] | 24 | unsigned int nr_pages; |
Inki Dae | 2b35892 | 2012-03-16 18:47:05 +0900 | [diff] [blame] | 25 | |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 26 | DRM_DEBUG_KMS("%s\n", __FILE__); |
| 27 | |
Inki Dae | 2b35892 | 2012-03-16 18:47:05 +0900 | [diff] [blame] | 28 | if (buf->dma_addr) { |
| 29 | DRM_DEBUG_KMS("already allocated.\n"); |
| 30 | return 0; |
| 31 | } |
| 32 | |
Inki Dae | 0519f9a | 2012-10-20 07:53:42 -0700 | [diff] [blame] | 33 | init_dma_attrs(&buf->dma_attrs); |
| 34 | |
Inki Dae | 1169af21 | 2012-12-14 14:34:31 +0900 | [diff] [blame] | 35 | /* |
| 36 | * if EXYNOS_BO_CONTIG, fully physically contiguous memory |
| 37 | * region will be allocated else physically contiguous |
| 38 | * as possible. |
| 39 | */ |
| 40 | if (flags & EXYNOS_BO_CONTIG) |
| 41 | dma_set_attr(DMA_ATTR_FORCE_CONTIGUOUS, &buf->dma_attrs); |
| 42 | |
| 43 | /* |
| 44 | * if EXYNOS_BO_WC or EXYNOS_BO_NONCACHABLE, writecombine mapping |
| 45 | * else cachable mapping. |
| 46 | */ |
| 47 | if (flags & EXYNOS_BO_WC || !(flags & EXYNOS_BO_CACHABLE)) |
Inki Dae | 0519f9a | 2012-10-20 07:53:42 -0700 | [diff] [blame] | 48 | attr = DMA_ATTR_WRITE_COMBINE; |
Inki Dae | 1169af21 | 2012-12-14 14:34:31 +0900 | [diff] [blame] | 49 | else |
| 50 | attr = DMA_ATTR_NON_CONSISTENT; |
Inki Dae | 0519f9a | 2012-10-20 07:53:42 -0700 | [diff] [blame] | 51 | |
| 52 | dma_set_attr(attr, &buf->dma_attrs); |
Inki Dae | 4744ad2 | 2012-12-07 17:51:27 +0900 | [diff] [blame] | 53 | dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &buf->dma_attrs); |
Inki Dae | 0519f9a | 2012-10-20 07:53:42 -0700 | [diff] [blame] | 54 | |
Inki Dae | 4744ad2 | 2012-12-07 17:51:27 +0900 | [diff] [blame] | 55 | buf->pages = dma_alloc_attrs(dev->dev, buf->size, |
Inki Dae | 0519f9a | 2012-10-20 07:53:42 -0700 | [diff] [blame] | 56 | &buf->dma_addr, GFP_KERNEL, &buf->dma_attrs); |
Inki Dae | 4744ad2 | 2012-12-07 17:51:27 +0900 | [diff] [blame] | 57 | if (!buf->pages) { |
Inki Dae | 0519f9a | 2012-10-20 07:53:42 -0700 | [diff] [blame] | 58 | DRM_ERROR("failed to allocate buffer.\n"); |
| 59 | return -ENOMEM; |
Inki Dae | 2b35892 | 2012-03-16 18:47:05 +0900 | [diff] [blame] | 60 | } |
| 61 | |
Inki Dae | 4744ad2 | 2012-12-07 17:51:27 +0900 | [diff] [blame] | 62 | nr_pages = buf->size >> PAGE_SHIFT; |
| 63 | buf->sgt = drm_prime_pages_to_sg(buf->pages, nr_pages); |
Inki Dae | 2b35892 | 2012-03-16 18:47:05 +0900 | [diff] [blame] | 64 | if (!buf->sgt) { |
Inki Dae | 4744ad2 | 2012-12-07 17:51:27 +0900 | [diff] [blame] | 65 | DRM_ERROR("failed to get sg table.\n"); |
Inki Dae | 61db75d | 2012-04-03 21:49:15 +0900 | [diff] [blame] | 66 | ret = -ENOMEM; |
Inki Dae | 0519f9a | 2012-10-20 07:53:42 -0700 | [diff] [blame] | 67 | goto err_free_attrs; |
Inki Dae | 61db75d | 2012-04-03 21:49:15 +0900 | [diff] [blame] | 68 | } |
Inki Dae | 2b35892 | 2012-03-16 18:47:05 +0900 | [diff] [blame] | 69 | |
Inki Dae | 4744ad2 | 2012-12-07 17:51:27 +0900 | [diff] [blame] | 70 | DRM_DEBUG_KMS("dma_addr(0x%lx), size(0x%lx)\n", |
Inki Dae | 2b35892 | 2012-03-16 18:47:05 +0900 | [diff] [blame] | 71 | (unsigned long)buf->dma_addr, |
| 72 | buf->size); |
| 73 | |
| 74 | return ret; |
Inki Dae | 0519f9a | 2012-10-20 07:53:42 -0700 | [diff] [blame] | 75 | |
Inki Dae | 0519f9a | 2012-10-20 07:53:42 -0700 | [diff] [blame] | 76 | err_free_attrs: |
Inki Dae | 4744ad2 | 2012-12-07 17:51:27 +0900 | [diff] [blame] | 77 | dma_free_attrs(dev->dev, buf->size, buf->pages, |
Inki Dae | 0519f9a | 2012-10-20 07:53:42 -0700 | [diff] [blame] | 78 | (dma_addr_t)buf->dma_addr, &buf->dma_attrs); |
| 79 | buf->dma_addr = (dma_addr_t)NULL; |
Inki Dae | 2b35892 | 2012-03-16 18:47:05 +0900 | [diff] [blame] | 80 | |
| 81 | return ret; |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 82 | } |
| 83 | |
| 84 | static void lowlevel_buffer_deallocate(struct drm_device *dev, |
Inki Dae | 2b35892 | 2012-03-16 18:47:05 +0900 | [diff] [blame] | 85 | unsigned int flags, struct exynos_drm_gem_buf *buf) |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 86 | { |
| 87 | DRM_DEBUG_KMS("%s.\n", __FILE__); |
| 88 | |
Inki Dae | 2b35892 | 2012-03-16 18:47:05 +0900 | [diff] [blame] | 89 | if (!buf->dma_addr) { |
| 90 | DRM_DEBUG_KMS("dma_addr is invalid.\n"); |
| 91 | return; |
| 92 | } |
| 93 | |
Inki Dae | 4744ad2 | 2012-12-07 17:51:27 +0900 | [diff] [blame] | 94 | DRM_DEBUG_KMS("dma_addr(0x%lx), size(0x%lx)\n", |
Inki Dae | 2b35892 | 2012-03-16 18:47:05 +0900 | [diff] [blame] | 95 | (unsigned long)buf->dma_addr, |
| 96 | buf->size); |
| 97 | |
| 98 | sg_free_table(buf->sgt); |
| 99 | |
| 100 | kfree(buf->sgt); |
| 101 | buf->sgt = NULL; |
| 102 | |
Inki Dae | 4744ad2 | 2012-12-07 17:51:27 +0900 | [diff] [blame] | 103 | dma_free_attrs(dev->dev, buf->size, buf->pages, |
Inki Dae | 0519f9a | 2012-10-20 07:53:42 -0700 | [diff] [blame] | 104 | (dma_addr_t)buf->dma_addr, &buf->dma_attrs); |
Inki Dae | 2b35892 | 2012-03-16 18:47:05 +0900 | [diff] [blame] | 105 | buf->dma_addr = (dma_addr_t)NULL; |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 106 | } |
| 107 | |
Inki Dae | 2b35892 | 2012-03-16 18:47:05 +0900 | [diff] [blame] | 108 | struct exynos_drm_gem_buf *exynos_drm_init_buf(struct drm_device *dev, |
| 109 | unsigned int size) |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 110 | { |
Inki Dae | 2c87112 | 2011-11-12 15:23:32 +0900 | [diff] [blame] | 111 | struct exynos_drm_gem_buf *buffer; |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 112 | |
| 113 | DRM_DEBUG_KMS("%s.\n", __FILE__); |
Inki Dae | 2c87112 | 2011-11-12 15:23:32 +0900 | [diff] [blame] | 114 | DRM_DEBUG_KMS("desired size = 0x%x\n", size); |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 115 | |
Inki Dae | 2c87112 | 2011-11-12 15:23:32 +0900 | [diff] [blame] | 116 | buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); |
| 117 | if (!buffer) { |
| 118 | DRM_ERROR("failed to allocate exynos_drm_gem_buf.\n"); |
Joonyoung Shim | ee5e770 | 2011-12-13 14:20:23 +0900 | [diff] [blame] | 119 | return NULL; |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 120 | } |
| 121 | |
Inki Dae | 2c87112 | 2011-11-12 15:23:32 +0900 | [diff] [blame] | 122 | buffer->size = size; |
Inki Dae | 2c87112 | 2011-11-12 15:23:32 +0900 | [diff] [blame] | 123 | return buffer; |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 124 | } |
| 125 | |
Inki Dae | 2b35892 | 2012-03-16 18:47:05 +0900 | [diff] [blame] | 126 | void exynos_drm_fini_buf(struct drm_device *dev, |
| 127 | struct exynos_drm_gem_buf *buffer) |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 128 | { |
| 129 | DRM_DEBUG_KMS("%s.\n", __FILE__); |
| 130 | |
Inki Dae | 2c87112 | 2011-11-12 15:23:32 +0900 | [diff] [blame] | 131 | if (!buffer) { |
| 132 | DRM_DEBUG_KMS("buffer is null.\n"); |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 133 | return; |
| 134 | } |
| 135 | |
Inki Dae | 2c87112 | 2011-11-12 15:23:32 +0900 | [diff] [blame] | 136 | kfree(buffer); |
| 137 | buffer = NULL; |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 138 | } |
| 139 | |
Inki Dae | 2b35892 | 2012-03-16 18:47:05 +0900 | [diff] [blame] | 140 | int exynos_drm_alloc_buf(struct drm_device *dev, |
| 141 | struct exynos_drm_gem_buf *buf, unsigned int flags) |
| 142 | { |
| 143 | |
| 144 | /* |
| 145 | * allocate memory region and set the memory information |
| 146 | * to vaddr and dma_addr of a buffer object. |
| 147 | */ |
| 148 | if (lowlevel_buffer_allocate(dev, flags, buf) < 0) |
| 149 | return -ENOMEM; |
| 150 | |
| 151 | return 0; |
| 152 | } |
| 153 | |
| 154 | void exynos_drm_free_buf(struct drm_device *dev, |
| 155 | unsigned int flags, struct exynos_drm_gem_buf *buffer) |
| 156 | { |
| 157 | |
| 158 | lowlevel_buffer_deallocate(dev, flags, buffer); |
| 159 | } |