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_probe_helper.h> 18 #include <drm/exynos_drm.h> 19 20 #include "exynos_drm_crtc.h" 21 #include "exynos_drm_drv.h" 22 #include "exynos_drm_fb.h" 23 #include "exynos_drm_fbdev.h" 24 25 static int check_fb_gem_memory_type(struct drm_device *drm_dev, 26 struct exynos_drm_gem *exynos_gem) 27 { 28 unsigned int flags; 29 30 /* 31 * if exynos drm driver supports iommu then framebuffer can use 32 * all the buffer types. 33 */ 34 if (is_drm_iommu_supported(drm_dev)) 35 return 0; 36 37 flags = exynos_gem->flags; 38 39 /* 40 * Physically non-contiguous memory type for framebuffer is not 41 * supported without IOMMU. 42 */ 43 if (IS_NONCONTIG_BUFFER(flags)) { 44 DRM_DEV_ERROR(drm_dev->dev, 45 "Non-contiguous GEM memory is not supported.\n"); 46 return -EINVAL; 47 } 48 49 return 0; 50 } 51 52 static const struct drm_framebuffer_funcs exynos_drm_fb_funcs = { 53 .destroy = drm_gem_fb_destroy, 54 .create_handle = drm_gem_fb_create_handle, 55 }; 56 57 struct drm_framebuffer * 58 exynos_drm_framebuffer_init(struct drm_device *dev, 59 const struct drm_mode_fb_cmd2 *mode_cmd, 60 struct exynos_drm_gem **exynos_gem, 61 int count) 62 { 63 struct drm_framebuffer *fb; 64 int i; 65 int ret; 66 67 fb = kzalloc(sizeof(*fb), GFP_KERNEL); 68 if (!fb) 69 return ERR_PTR(-ENOMEM); 70 71 for (i = 0; i < count; i++) { 72 ret = check_fb_gem_memory_type(dev, exynos_gem[i]); 73 if (ret < 0) 74 goto err; 75 76 fb->obj[i] = &exynos_gem[i]->base; 77 } 78 79 drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd); 80 81 ret = drm_framebuffer_init(dev, fb, &exynos_drm_fb_funcs); 82 if (ret < 0) { 83 DRM_DEV_ERROR(dev->dev, 84 "failed to initialize framebuffer\n"); 85 goto err; 86 } 87 88 return fb; 89 90 err: 91 kfree(fb); 92 return ERR_PTR(ret); 93 } 94 95 static struct drm_framebuffer * 96 exynos_user_fb_create(struct drm_device *dev, struct drm_file *file_priv, 97 const struct drm_mode_fb_cmd2 *mode_cmd) 98 { 99 const struct drm_format_info *info = drm_get_format_info(dev, mode_cmd); 100 struct exynos_drm_gem *exynos_gem[MAX_FB_BUFFER]; 101 struct drm_framebuffer *fb; 102 int i; 103 int ret; 104 105 for (i = 0; i < info->num_planes; i++) { 106 unsigned int height = (i == 0) ? mode_cmd->height : 107 DIV_ROUND_UP(mode_cmd->height, info->vsub); 108 unsigned long size = height * mode_cmd->pitches[i] + 109 mode_cmd->offsets[i]; 110 111 exynos_gem[i] = exynos_drm_gem_get(file_priv, 112 mode_cmd->handles[i]); 113 if (!exynos_gem[i]) { 114 DRM_DEV_ERROR(dev->dev, 115 "failed to lookup gem object\n"); 116 ret = -ENOENT; 117 goto err; 118 } 119 120 if (size > exynos_gem[i]->size) { 121 i++; 122 ret = -EINVAL; 123 goto err; 124 } 125 } 126 127 fb = exynos_drm_framebuffer_init(dev, mode_cmd, exynos_gem, i); 128 if (IS_ERR(fb)) { 129 ret = PTR_ERR(fb); 130 goto err; 131 } 132 133 return fb; 134 135 err: 136 while (i--) 137 exynos_drm_gem_put(exynos_gem[i]); 138 139 return ERR_PTR(ret); 140 } 141 142 dma_addr_t exynos_drm_fb_dma_addr(struct drm_framebuffer *fb, int index) 143 { 144 struct exynos_drm_gem *exynos_gem; 145 146 if (WARN_ON_ONCE(index >= MAX_FB_BUFFER)) 147 return 0; 148 149 exynos_gem = to_exynos_gem(fb->obj[index]); 150 return exynos_gem->dma_addr + fb->offsets[index]; 151 } 152 153 static struct drm_mode_config_helper_funcs exynos_drm_mode_config_helpers = { 154 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm, 155 }; 156 157 static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = { 158 .fb_create = exynos_user_fb_create, 159 .atomic_check = drm_atomic_helper_check, 160 .atomic_commit = drm_atomic_helper_commit, 161 }; 162 163 void exynos_drm_mode_config_init(struct drm_device *dev) 164 { 165 dev->mode_config.min_width = 0; 166 dev->mode_config.min_height = 0; 167 168 /* 169 * set max width and height as default value(4096x4096). 170 * this value would be used to check framebuffer size limitation 171 * at drm_mode_addfb(). 172 */ 173 dev->mode_config.max_width = 4096; 174 dev->mode_config.max_height = 4096; 175 176 dev->mode_config.funcs = &exynos_drm_mode_config_funcs; 177 dev->mode_config.helper_private = &exynos_drm_mode_config_helpers; 178 179 dev->mode_config.normalize_zpos = true; 180 } 181