1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2013 Red Hat 4 * Author: Rob Clark <robdclark@gmail.com> 5 */ 6 7 #include <drm/drm_aperture.h> 8 #include <drm/drm_crtc.h> 9 #include <drm/drm_fb_helper.h> 10 #include <drm/drm_fourcc.h> 11 12 #include "msm_drv.h" 13 #include "msm_gem.h" 14 #include "msm_kms.h" 15 16 extern int msm_gem_mmap_obj(struct drm_gem_object *obj, 17 struct vm_area_struct *vma); 18 static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma); 19 20 /* 21 * fbdev funcs, to implement legacy fbdev interface on top of drm driver 22 */ 23 24 #define to_msm_fbdev(x) container_of(x, struct msm_fbdev, base) 25 26 struct msm_fbdev { 27 struct drm_fb_helper base; 28 struct drm_framebuffer *fb; 29 }; 30 31 static const struct fb_ops msm_fb_ops = { 32 .owner = THIS_MODULE, 33 DRM_FB_HELPER_DEFAULT_OPS, 34 35 /* Note: to properly handle manual update displays, we wrap the 36 * basic fbdev ops which write to the framebuffer 37 */ 38 .fb_read = drm_fb_helper_sys_read, 39 .fb_write = drm_fb_helper_sys_write, 40 .fb_fillrect = drm_fb_helper_sys_fillrect, 41 .fb_copyarea = drm_fb_helper_sys_copyarea, 42 .fb_imageblit = drm_fb_helper_sys_imageblit, 43 .fb_mmap = msm_fbdev_mmap, 44 }; 45 46 static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma) 47 { 48 struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par; 49 struct msm_fbdev *fbdev = to_msm_fbdev(helper); 50 struct drm_gem_object *bo = msm_framebuffer_bo(fbdev->fb, 0); 51 int ret = 0; 52 53 ret = drm_gem_mmap_obj(bo, bo->size, vma); 54 if (ret) { 55 pr_err("%s:drm_gem_mmap_obj fail\n", __func__); 56 return ret; 57 } 58 59 return msm_gem_mmap_obj(bo, vma); 60 } 61 62 static int msm_fbdev_create(struct drm_fb_helper *helper, 63 struct drm_fb_helper_surface_size *sizes) 64 { 65 struct msm_fbdev *fbdev = to_msm_fbdev(helper); 66 struct drm_device *dev = helper->dev; 67 struct msm_drm_private *priv = dev->dev_private; 68 struct drm_framebuffer *fb = NULL; 69 struct drm_gem_object *bo; 70 struct fb_info *fbi = NULL; 71 uint64_t paddr; 72 uint32_t format; 73 int ret, pitch; 74 75 format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth); 76 77 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width, 78 sizes->surface_height, sizes->surface_bpp, 79 sizes->fb_width, sizes->fb_height); 80 81 pitch = align_pitch(sizes->surface_width, sizes->surface_bpp); 82 fb = msm_alloc_stolen_fb(dev, sizes->surface_width, 83 sizes->surface_height, pitch, format); 84 85 if (IS_ERR(fb)) { 86 DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n"); 87 return PTR_ERR(fb); 88 } 89 90 bo = msm_framebuffer_bo(fb, 0); 91 92 mutex_lock(&dev->struct_mutex); 93 94 /* 95 * NOTE: if we can be guaranteed to be able to map buffer 96 * in panic (ie. lock-safe, etc) we could avoid pinning the 97 * buffer now: 98 */ 99 ret = msm_gem_get_and_pin_iova(bo, priv->kms->aspace, &paddr); 100 if (ret) { 101 DRM_DEV_ERROR(dev->dev, "failed to get buffer obj iova: %d\n", ret); 102 goto fail_unlock; 103 } 104 105 fbi = drm_fb_helper_alloc_fbi(helper); 106 if (IS_ERR(fbi)) { 107 DRM_DEV_ERROR(dev->dev, "failed to allocate fb info\n"); 108 ret = PTR_ERR(fbi); 109 goto fail_unlock; 110 } 111 112 DBG("fbi=%p, dev=%p", fbi, dev); 113 114 fbdev->fb = fb; 115 helper->fb = fb; 116 117 fbi->fbops = &msm_fb_ops; 118 119 drm_fb_helper_fill_info(fbi, helper, sizes); 120 121 dev->mode_config.fb_base = paddr; 122 123 fbi->screen_base = msm_gem_get_vaddr(bo); 124 if (IS_ERR(fbi->screen_base)) { 125 ret = PTR_ERR(fbi->screen_base); 126 goto fail_unlock; 127 } 128 fbi->screen_size = bo->size; 129 fbi->fix.smem_start = paddr; 130 fbi->fix.smem_len = bo->size; 131 132 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres); 133 DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height); 134 135 mutex_unlock(&dev->struct_mutex); 136 137 return 0; 138 139 fail_unlock: 140 mutex_unlock(&dev->struct_mutex); 141 drm_framebuffer_remove(fb); 142 return ret; 143 } 144 145 static const struct drm_fb_helper_funcs msm_fb_helper_funcs = { 146 .fb_probe = msm_fbdev_create, 147 }; 148 149 /* initialize fbdev helper */ 150 struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev) 151 { 152 struct msm_drm_private *priv = dev->dev_private; 153 struct msm_fbdev *fbdev = NULL; 154 struct drm_fb_helper *helper; 155 int ret; 156 157 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 158 if (!fbdev) 159 goto fail; 160 161 helper = &fbdev->base; 162 163 drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs); 164 165 ret = drm_fb_helper_init(dev, helper); 166 if (ret) { 167 DRM_DEV_ERROR(dev->dev, "could not init fbdev: ret=%d\n", ret); 168 goto fail; 169 } 170 171 /* the fw fb could be anywhere in memory */ 172 ret = drm_aperture_remove_framebuffers(false, "msm"); 173 if (ret) 174 goto fini; 175 176 ret = drm_fb_helper_initial_config(helper, 32); 177 if (ret) 178 goto fini; 179 180 priv->fbdev = helper; 181 182 return helper; 183 184 fini: 185 drm_fb_helper_fini(helper); 186 fail: 187 kfree(fbdev); 188 return NULL; 189 } 190 191 void msm_fbdev_free(struct drm_device *dev) 192 { 193 struct msm_drm_private *priv = dev->dev_private; 194 struct drm_fb_helper *helper = priv->fbdev; 195 struct msm_fbdev *fbdev; 196 197 DBG(); 198 199 drm_fb_helper_unregister_fbi(helper); 200 201 drm_fb_helper_fini(helper); 202 203 fbdev = to_msm_fbdev(priv->fbdev); 204 205 /* this will free the backing object */ 206 if (fbdev->fb) { 207 struct drm_gem_object *bo = 208 msm_framebuffer_bo(fbdev->fb, 0); 209 msm_gem_put_vaddr(bo); 210 drm_framebuffer_remove(fbdev->fb); 211 } 212 213 kfree(fbdev); 214 215 priv->fbdev = NULL; 216 } 217