1 /* exynos_drm_fb.c 2 * 3 * Copyright (c) 2011 Samsung Electronics Co., Ltd. 4 * Authors: 5 * Inki Dae <inki.dae@samsung.com> 6 * Joonyoung Shim <jy0922.shim@samsung.com> 7 * Seung-Woo Kim <sw0312.kim@samsung.com> 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License as published by the 11 * Free Software Foundation; either version 2 of the License, or (at your 12 * option) any later version. 13 */ 14 15 #include <drm/drmP.h> 16 #include <drm/drm_crtc.h> 17 #include <drm/drm_crtc_helper.h> 18 #include <drm/drm_fb_helper.h> 19 #include <drm/drm_atomic.h> 20 #include <drm/drm_atomic_helper.h> 21 #include <uapi/drm/exynos_drm.h> 22 23 #include "exynos_drm_drv.h" 24 #include "exynos_drm_fb.h" 25 #include "exynos_drm_fbdev.h" 26 #include "exynos_drm_iommu.h" 27 #include "exynos_drm_crtc.h" 28 29 #define to_exynos_fb(x) container_of(x, struct exynos_drm_fb, fb) 30 31 /* 32 * exynos specific framebuffer structure. 33 * 34 * @fb: drm framebuffer obejct. 35 * @exynos_gem: array of exynos specific gem object containing a gem object. 36 */ 37 struct exynos_drm_fb { 38 struct drm_framebuffer fb; 39 struct exynos_drm_gem *exynos_gem[MAX_FB_BUFFER]; 40 dma_addr_t dma_addr[MAX_FB_BUFFER]; 41 }; 42 43 static int check_fb_gem_memory_type(struct drm_device *drm_dev, 44 struct exynos_drm_gem *exynos_gem) 45 { 46 unsigned int flags; 47 48 /* 49 * if exynos drm driver supports iommu then framebuffer can use 50 * all the buffer types. 51 */ 52 if (is_drm_iommu_supported(drm_dev)) 53 return 0; 54 55 flags = exynos_gem->flags; 56 57 /* 58 * Physically non-contiguous memory type for framebuffer is not 59 * supported without IOMMU. 60 */ 61 if (IS_NONCONTIG_BUFFER(flags)) { 62 DRM_ERROR("Non-contiguous GEM memory is not supported.\n"); 63 return -EINVAL; 64 } 65 66 return 0; 67 } 68 69 static void exynos_drm_fb_destroy(struct drm_framebuffer *fb) 70 { 71 struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb); 72 unsigned int i; 73 74 drm_framebuffer_cleanup(fb); 75 76 for (i = 0; i < ARRAY_SIZE(exynos_fb->exynos_gem); i++) { 77 struct drm_gem_object *obj; 78 79 if (exynos_fb->exynos_gem[i] == NULL) 80 continue; 81 82 obj = &exynos_fb->exynos_gem[i]->base; 83 drm_gem_object_unreference_unlocked(obj); 84 } 85 86 kfree(exynos_fb); 87 exynos_fb = NULL; 88 } 89 90 static int exynos_drm_fb_create_handle(struct drm_framebuffer *fb, 91 struct drm_file *file_priv, 92 unsigned int *handle) 93 { 94 struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb); 95 96 return drm_gem_handle_create(file_priv, 97 &exynos_fb->exynos_gem[0]->base, handle); 98 } 99 100 static const struct drm_framebuffer_funcs exynos_drm_fb_funcs = { 101 .destroy = exynos_drm_fb_destroy, 102 .create_handle = exynos_drm_fb_create_handle, 103 }; 104 105 struct drm_framebuffer * 106 exynos_drm_framebuffer_init(struct drm_device *dev, 107 const struct drm_mode_fb_cmd2 *mode_cmd, 108 struct exynos_drm_gem **exynos_gem, 109 int count) 110 { 111 struct exynos_drm_fb *exynos_fb; 112 int i; 113 int ret; 114 115 exynos_fb = kzalloc(sizeof(*exynos_fb), GFP_KERNEL); 116 if (!exynos_fb) 117 return ERR_PTR(-ENOMEM); 118 119 for (i = 0; i < count; i++) { 120 ret = check_fb_gem_memory_type(dev, exynos_gem[i]); 121 if (ret < 0) 122 goto err; 123 124 exynos_fb->exynos_gem[i] = exynos_gem[i]; 125 exynos_fb->dma_addr[i] = exynos_gem[i]->dma_addr 126 + mode_cmd->offsets[i]; 127 } 128 129 drm_helper_mode_fill_fb_struct(dev, &exynos_fb->fb, mode_cmd); 130 131 ret = drm_framebuffer_init(dev, &exynos_fb->fb, &exynos_drm_fb_funcs); 132 if (ret < 0) { 133 DRM_ERROR("failed to initialize framebuffer\n"); 134 goto err; 135 } 136 137 return &exynos_fb->fb; 138 139 err: 140 kfree(exynos_fb); 141 return ERR_PTR(ret); 142 } 143 144 static struct drm_framebuffer * 145 exynos_user_fb_create(struct drm_device *dev, struct drm_file *file_priv, 146 const struct drm_mode_fb_cmd2 *mode_cmd) 147 { 148 const struct drm_format_info *info = drm_get_format_info(dev, mode_cmd); 149 struct exynos_drm_gem *exynos_gem[MAX_FB_BUFFER]; 150 struct drm_gem_object *obj; 151 struct drm_framebuffer *fb; 152 int i; 153 int ret; 154 155 for (i = 0; i < info->num_planes; i++) { 156 unsigned int height = (i == 0) ? mode_cmd->height : 157 DIV_ROUND_UP(mode_cmd->height, info->vsub); 158 unsigned long size = height * mode_cmd->pitches[i] + 159 mode_cmd->offsets[i]; 160 161 obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[i]); 162 if (!obj) { 163 DRM_ERROR("failed to lookup gem object\n"); 164 ret = -ENOENT; 165 goto err; 166 } 167 168 exynos_gem[i] = to_exynos_gem(obj); 169 170 if (size > exynos_gem[i]->size) { 171 i++; 172 ret = -EINVAL; 173 goto err; 174 } 175 } 176 177 fb = exynos_drm_framebuffer_init(dev, mode_cmd, exynos_gem, i); 178 if (IS_ERR(fb)) { 179 ret = PTR_ERR(fb); 180 goto err; 181 } 182 183 return fb; 184 185 err: 186 while (i--) 187 drm_gem_object_unreference_unlocked(&exynos_gem[i]->base); 188 189 return ERR_PTR(ret); 190 } 191 192 dma_addr_t exynos_drm_fb_dma_addr(struct drm_framebuffer *fb, int index) 193 { 194 struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb); 195 196 if (WARN_ON_ONCE(index >= MAX_FB_BUFFER)) 197 return 0; 198 199 return exynos_fb->dma_addr[index]; 200 } 201 202 static struct drm_mode_config_helper_funcs exynos_drm_mode_config_helpers = { 203 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm, 204 }; 205 206 static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = { 207 .fb_create = exynos_user_fb_create, 208 .output_poll_changed = exynos_drm_output_poll_changed, 209 .atomic_check = exynos_atomic_check, 210 .atomic_commit = drm_atomic_helper_commit, 211 }; 212 213 void exynos_drm_mode_config_init(struct drm_device *dev) 214 { 215 dev->mode_config.min_width = 0; 216 dev->mode_config.min_height = 0; 217 218 /* 219 * set max width and height as default value(4096x4096). 220 * this value would be used to check framebuffer size limitation 221 * at drm_mode_addfb(). 222 */ 223 dev->mode_config.max_width = 4096; 224 dev->mode_config.max_height = 4096; 225 226 dev->mode_config.funcs = &exynos_drm_mode_config_funcs; 227 dev->mode_config.helper_private = &exynos_drm_mode_config_helpers; 228 229 dev->mode_config.allow_fb_modifiers = true; 230 } 231