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 <drm/drm_gem_framebuffer_helper.h> 22 #include <uapi/drm/exynos_drm.h> 23 24 #include "exynos_drm_drv.h" 25 #include "exynos_drm_fb.h" 26 #include "exynos_drm_fbdev.h" 27 #include "exynos_drm_iommu.h" 28 #include "exynos_drm_crtc.h" 29 30 static int check_fb_gem_memory_type(struct drm_device *drm_dev, 31 struct exynos_drm_gem *exynos_gem) 32 { 33 unsigned int flags; 34 35 /* 36 * if exynos drm driver supports iommu then framebuffer can use 37 * all the buffer types. 38 */ 39 if (is_drm_iommu_supported(drm_dev)) 40 return 0; 41 42 flags = exynos_gem->flags; 43 44 /* 45 * Physically non-contiguous memory type for framebuffer is not 46 * supported without IOMMU. 47 */ 48 if (IS_NONCONTIG_BUFFER(flags)) { 49 DRM_ERROR("Non-contiguous GEM memory is not supported.\n"); 50 return -EINVAL; 51 } 52 53 return 0; 54 } 55 56 static const struct drm_framebuffer_funcs exynos_drm_fb_funcs = { 57 .destroy = drm_gem_fb_destroy, 58 .create_handle = drm_gem_fb_create_handle, 59 }; 60 61 struct drm_framebuffer * 62 exynos_drm_framebuffer_init(struct drm_device *dev, 63 const struct drm_mode_fb_cmd2 *mode_cmd, 64 struct exynos_drm_gem **exynos_gem, 65 int count) 66 { 67 struct drm_framebuffer *fb; 68 int i; 69 int ret; 70 71 fb = kzalloc(sizeof(*fb), GFP_KERNEL); 72 if (!fb) 73 return ERR_PTR(-ENOMEM); 74 75 for (i = 0; i < count; i++) { 76 ret = check_fb_gem_memory_type(dev, exynos_gem[i]); 77 if (ret < 0) 78 goto err; 79 80 fb->obj[i] = &exynos_gem[i]->base; 81 } 82 83 drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd); 84 85 ret = drm_framebuffer_init(dev, fb, &exynos_drm_fb_funcs); 86 if (ret < 0) { 87 DRM_ERROR("failed to initialize framebuffer\n"); 88 goto err; 89 } 90 91 return fb; 92 93 err: 94 kfree(fb); 95 return ERR_PTR(ret); 96 } 97 98 static struct drm_framebuffer * 99 exynos_user_fb_create(struct drm_device *dev, struct drm_file *file_priv, 100 const struct drm_mode_fb_cmd2 *mode_cmd) 101 { 102 const struct drm_format_info *info = drm_get_format_info(dev, mode_cmd); 103 struct exynos_drm_gem *exynos_gem[MAX_FB_BUFFER]; 104 struct drm_gem_object *obj; 105 struct drm_framebuffer *fb; 106 int i; 107 int ret; 108 109 for (i = 0; i < info->num_planes; i++) { 110 unsigned int height = (i == 0) ? mode_cmd->height : 111 DIV_ROUND_UP(mode_cmd->height, info->vsub); 112 unsigned long size = height * mode_cmd->pitches[i] + 113 mode_cmd->offsets[i]; 114 115 obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[i]); 116 if (!obj) { 117 DRM_ERROR("failed to lookup gem object\n"); 118 ret = -ENOENT; 119 goto err; 120 } 121 122 exynos_gem[i] = to_exynos_gem(obj); 123 124 if (size > exynos_gem[i]->size) { 125 i++; 126 ret = -EINVAL; 127 goto err; 128 } 129 } 130 131 fb = exynos_drm_framebuffer_init(dev, mode_cmd, exynos_gem, i); 132 if (IS_ERR(fb)) { 133 ret = PTR_ERR(fb); 134 goto err; 135 } 136 137 return fb; 138 139 err: 140 while (i--) 141 drm_gem_object_unreference_unlocked(&exynos_gem[i]->base); 142 143 return ERR_PTR(ret); 144 } 145 146 dma_addr_t exynos_drm_fb_dma_addr(struct drm_framebuffer *fb, int index) 147 { 148 struct exynos_drm_gem *exynos_gem; 149 150 if (WARN_ON_ONCE(index >= MAX_FB_BUFFER)) 151 return 0; 152 153 exynos_gem = to_exynos_gem(fb->obj[index]); 154 return exynos_gem->dma_addr + fb->offsets[index]; 155 } 156 157 static struct drm_mode_config_helper_funcs exynos_drm_mode_config_helpers = { 158 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm, 159 }; 160 161 static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = { 162 .fb_create = exynos_user_fb_create, 163 .output_poll_changed = drm_fb_helper_output_poll_changed, 164 .atomic_check = drm_atomic_helper_check, 165 .atomic_commit = drm_atomic_helper_commit, 166 }; 167 168 void exynos_drm_mode_config_init(struct drm_device *dev) 169 { 170 dev->mode_config.min_width = 0; 171 dev->mode_config.min_height = 0; 172 173 /* 174 * set max width and height as default value(4096x4096). 175 * this value would be used to check framebuffer size limitation 176 * at drm_mode_addfb(). 177 */ 178 dev->mode_config.max_width = 4096; 179 dev->mode_config.max_height = 4096; 180 181 dev->mode_config.funcs = &exynos_drm_mode_config_funcs; 182 dev->mode_config.helper_private = &exynos_drm_mode_config_helpers; 183 184 dev->mode_config.allow_fb_modifiers = true; 185 186 dev->mode_config.normalize_zpos = true; 187 } 188