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_framebuffer *fb; 105 int i; 106 int ret; 107 108 for (i = 0; i < info->num_planes; i++) { 109 unsigned int height = (i == 0) ? mode_cmd->height : 110 DIV_ROUND_UP(mode_cmd->height, info->vsub); 111 unsigned long size = height * mode_cmd->pitches[i] + 112 mode_cmd->offsets[i]; 113 114 exynos_gem[i] = exynos_drm_gem_get(file_priv, 115 mode_cmd->handles[i]); 116 if (!exynos_gem[i]) { 117 DRM_ERROR("failed to lookup gem object\n"); 118 ret = -ENOENT; 119 goto err; 120 } 121 122 if (size > exynos_gem[i]->size) { 123 i++; 124 ret = -EINVAL; 125 goto err; 126 } 127 } 128 129 fb = exynos_drm_framebuffer_init(dev, mode_cmd, exynos_gem, i); 130 if (IS_ERR(fb)) { 131 ret = PTR_ERR(fb); 132 goto err; 133 } 134 135 return fb; 136 137 err: 138 while (i--) 139 exynos_drm_gem_put(exynos_gem[i]); 140 141 return ERR_PTR(ret); 142 } 143 144 dma_addr_t exynos_drm_fb_dma_addr(struct drm_framebuffer *fb, int index) 145 { 146 struct exynos_drm_gem *exynos_gem; 147 148 if (WARN_ON_ONCE(index >= MAX_FB_BUFFER)) 149 return 0; 150 151 exynos_gem = to_exynos_gem(fb->obj[index]); 152 return exynos_gem->dma_addr + fb->offsets[index]; 153 } 154 155 static struct drm_mode_config_helper_funcs exynos_drm_mode_config_helpers = { 156 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm, 157 }; 158 159 static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = { 160 .fb_create = exynos_user_fb_create, 161 .output_poll_changed = drm_fb_helper_output_poll_changed, 162 .atomic_check = drm_atomic_helper_check, 163 .atomic_commit = drm_atomic_helper_commit, 164 }; 165 166 void exynos_drm_mode_config_init(struct drm_device *dev) 167 { 168 dev->mode_config.min_width = 0; 169 dev->mode_config.min_height = 0; 170 171 /* 172 * set max width and height as default value(4096x4096). 173 * this value would be used to check framebuffer size limitation 174 * at drm_mode_addfb(). 175 */ 176 dev->mode_config.max_width = 4096; 177 dev->mode_config.max_height = 4096; 178 179 dev->mode_config.funcs = &exynos_drm_mode_config_funcs; 180 dev->mode_config.helper_private = &exynos_drm_mode_config_helpers; 181 182 dev->mode_config.allow_fb_modifiers = true; 183 184 dev->mode_config.normalize_zpos = true; 185 } 186