1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* exynos_drm_fb.c 3 * 4 * Copyright (c) 2011 Samsung Electronics Co., Ltd. 5 * Authors: 6 * Inki Dae <inki.dae@samsung.com> 7 * Joonyoung Shim <jy0922.shim@samsung.com> 8 * Seung-Woo Kim <sw0312.kim@samsung.com> 9 */ 10 11 #include <drm/drm_atomic.h> 12 #include <drm/drm_atomic_helper.h> 13 #include <drm/drm_crtc.h> 14 #include <drm/drm_framebuffer.h> 15 #include <drm/drm_fourcc.h> 16 #include <drm/drm_gem_framebuffer_helper.h> 17 #include <drm/drm_print.h> 18 #include <drm/drm_probe_helper.h> 19 #include <drm/exynos_drm.h> 20 21 #include "exynos_drm_crtc.h" 22 #include "exynos_drm_drv.h" 23 #include "exynos_drm_fb.h" 24 #include "exynos_drm_fbdev.h" 25 #include "exynos_drm_gem.h" 26 27 static int check_fb_gem_memory_type(struct drm_device *drm_dev, 28 struct exynos_drm_gem *exynos_gem) 29 { 30 unsigned int flags; 31 32 /* 33 * if exynos drm driver supports iommu then framebuffer can use 34 * all the buffer types. 35 */ 36 if (is_drm_iommu_supported(drm_dev)) 37 return 0; 38 39 flags = exynos_gem->flags; 40 41 /* 42 * Physically non-contiguous memory type for framebuffer is not 43 * supported without IOMMU. 44 */ 45 if (IS_NONCONTIG_BUFFER(flags)) { 46 DRM_DEV_ERROR(drm_dev->dev, 47 "Non-contiguous GEM memory is not supported.\n"); 48 return -EINVAL; 49 } 50 51 return 0; 52 } 53 54 static const struct drm_framebuffer_funcs exynos_drm_fb_funcs = { 55 .destroy = drm_gem_fb_destroy, 56 .create_handle = drm_gem_fb_create_handle, 57 }; 58 59 static struct drm_framebuffer * 60 exynos_drm_framebuffer_init(struct drm_device *dev, 61 const struct drm_format_info *info, 62 const struct drm_mode_fb_cmd2 *mode_cmd, 63 struct exynos_drm_gem **exynos_gem, 64 int count) 65 { 66 struct drm_framebuffer *fb; 67 int i; 68 int ret; 69 70 fb = kzalloc_obj(*fb); 71 if (!fb) 72 return ERR_PTR(-ENOMEM); 73 74 for (i = 0; i < count; i++) { 75 ret = check_fb_gem_memory_type(dev, exynos_gem[i]); 76 if (ret < 0) 77 goto err; 78 79 fb->obj[i] = &exynos_gem[i]->base; 80 } 81 82 drm_helper_mode_fill_fb_struct(dev, fb, info, mode_cmd); 83 84 ret = drm_framebuffer_init(dev, fb, &exynos_drm_fb_funcs); 85 if (ret < 0) { 86 DRM_DEV_ERROR(dev->dev, 87 "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_format_info *info, 101 const struct drm_mode_fb_cmd2 *mode_cmd) 102 { 103 struct exynos_drm_gem *exynos_gem[DRM_FORMAT_MAX_PLANES]; 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_DEV_ERROR(dev->dev, 118 "failed to lookup gem object\n"); 119 ret = -ENOENT; 120 goto err; 121 } 122 123 if (size > exynos_gem[i]->base.size) { 124 i++; 125 ret = -EINVAL; 126 goto err; 127 } 128 } 129 130 fb = exynos_drm_framebuffer_init(dev, info, mode_cmd, exynos_gem, i); 131 if (IS_ERR(fb)) { 132 ret = PTR_ERR(fb); 133 goto err; 134 } 135 136 return fb; 137 138 err: 139 while (i--) 140 exynos_drm_gem_put(exynos_gem[i]); 141 142 return ERR_PTR(ret); 143 } 144 145 dma_addr_t exynos_drm_fb_dma_addr(struct drm_framebuffer *fb, int index) 146 { 147 struct exynos_drm_gem *exynos_gem; 148 149 if (WARN_ON_ONCE(index >= DRM_FORMAT_MAX_PLANES)) 150 return 0; 151 152 exynos_gem = to_exynos_gem(fb->obj[index]); 153 return exynos_gem->dma_addr + fb->offsets[index]; 154 } 155 156 static struct drm_mode_config_helper_funcs exynos_drm_mode_config_helpers = { 157 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm, 158 }; 159 160 static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = { 161 .fb_create = exynos_user_fb_create, 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.normalize_zpos = true; 183 } 184