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_fb_helper.h> 15 #include <drm/drm_framebuffer.h> 16 #include <drm/drm_fourcc.h> 17 #include <drm/drm_gem_framebuffer_helper.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 26 static int check_fb_gem_memory_type(struct drm_device *drm_dev, 27 struct exynos_drm_gem *exynos_gem) 28 { 29 unsigned int flags; 30 31 /* 32 * if exynos drm driver supports iommu then framebuffer can use 33 * all the buffer types. 34 */ 35 if (is_drm_iommu_supported(drm_dev)) 36 return 0; 37 38 flags = exynos_gem->flags; 39 40 /* 41 * Physically non-contiguous memory type for framebuffer is not 42 * supported without IOMMU. 43 */ 44 if (IS_NONCONTIG_BUFFER(flags)) { 45 DRM_DEV_ERROR(drm_dev->dev, 46 "Non-contiguous GEM memory is not supported.\n"); 47 return -EINVAL; 48 } 49 50 return 0; 51 } 52 53 static const struct drm_framebuffer_funcs exynos_drm_fb_funcs = { 54 .destroy = drm_gem_fb_destroy, 55 .create_handle = drm_gem_fb_create_handle, 56 }; 57 58 struct drm_framebuffer * 59 exynos_drm_framebuffer_init(struct drm_device *dev, 60 const struct drm_mode_fb_cmd2 *mode_cmd, 61 struct exynos_drm_gem **exynos_gem, 62 int count) 63 { 64 struct drm_framebuffer *fb; 65 int i; 66 int ret; 67 68 fb = kzalloc(sizeof(*fb), GFP_KERNEL); 69 if (!fb) 70 return ERR_PTR(-ENOMEM); 71 72 for (i = 0; i < count; i++) { 73 ret = check_fb_gem_memory_type(dev, exynos_gem[i]); 74 if (ret < 0) 75 goto err; 76 77 fb->obj[i] = &exynos_gem[i]->base; 78 } 79 80 drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd); 81 82 ret = drm_framebuffer_init(dev, fb, &exynos_drm_fb_funcs); 83 if (ret < 0) { 84 DRM_DEV_ERROR(dev->dev, 85 "failed to initialize framebuffer\n"); 86 goto err; 87 } 88 89 return fb; 90 91 err: 92 kfree(fb); 93 return ERR_PTR(ret); 94 } 95 96 static struct drm_framebuffer * 97 exynos_user_fb_create(struct drm_device *dev, struct drm_file *file_priv, 98 const struct drm_mode_fb_cmd2 *mode_cmd) 99 { 100 const struct drm_format_info *info = drm_get_format_info(dev, mode_cmd); 101 struct exynos_drm_gem *exynos_gem[MAX_FB_BUFFER]; 102 struct drm_framebuffer *fb; 103 int i; 104 int ret; 105 106 for (i = 0; i < info->num_planes; i++) { 107 unsigned int height = (i == 0) ? mode_cmd->height : 108 DIV_ROUND_UP(mode_cmd->height, info->vsub); 109 unsigned long size = height * mode_cmd->pitches[i] + 110 mode_cmd->offsets[i]; 111 112 exynos_gem[i] = exynos_drm_gem_get(file_priv, 113 mode_cmd->handles[i]); 114 if (!exynos_gem[i]) { 115 DRM_DEV_ERROR(dev->dev, 116 "failed to lookup gem object\n"); 117 ret = -ENOENT; 118 goto err; 119 } 120 121 if (size > exynos_gem[i]->size) { 122 i++; 123 ret = -EINVAL; 124 goto err; 125 } 126 } 127 128 fb = exynos_drm_framebuffer_init(dev, mode_cmd, exynos_gem, i); 129 if (IS_ERR(fb)) { 130 ret = PTR_ERR(fb); 131 goto err; 132 } 133 134 return fb; 135 136 err: 137 while (i--) 138 exynos_drm_gem_put(exynos_gem[i]); 139 140 return ERR_PTR(ret); 141 } 142 143 dma_addr_t exynos_drm_fb_dma_addr(struct drm_framebuffer *fb, int index) 144 { 145 struct exynos_drm_gem *exynos_gem; 146 147 if (WARN_ON_ONCE(index >= MAX_FB_BUFFER)) 148 return 0; 149 150 exynos_gem = to_exynos_gem(fb->obj[index]); 151 return exynos_gem->dma_addr + fb->offsets[index]; 152 } 153 154 static struct drm_mode_config_helper_funcs exynos_drm_mode_config_helpers = { 155 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm, 156 }; 157 158 static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = { 159 .fb_create = exynos_user_fb_create, 160 .output_poll_changed = drm_fb_helper_output_poll_changed, 161 .atomic_check = drm_atomic_helper_check, 162 .atomic_commit = drm_atomic_helper_commit, 163 }; 164 165 void exynos_drm_mode_config_init(struct drm_device *dev) 166 { 167 dev->mode_config.min_width = 0; 168 dev->mode_config.min_height = 0; 169 170 /* 171 * set max width and height as default value(4096x4096). 172 * this value would be used to check framebuffer size limitation 173 * at drm_mode_addfb(). 174 */ 175 dev->mode_config.max_width = 4096; 176 dev->mode_config.max_height = 4096; 177 178 dev->mode_config.funcs = &exynos_drm_mode_config_funcs; 179 dev->mode_config.helper_private = &exynos_drm_mode_config_helpers; 180 181 dev->mode_config.normalize_zpos = true; 182 } 183