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 <linux/fb.h> 8 9 #include <drm/drm_drv.h> 10 #include <drm/drm_crtc_helper.h> 11 #include <drm/drm_fb_helper.h> 12 #include <drm/drm_fourcc.h> 13 #include <drm/drm_framebuffer.h> 14 #include <drm/drm_prime.h> 15 16 #include "msm_drv.h" 17 #include "msm_gem.h" 18 #include "msm_kms.h" 19 20 static bool fbdev = true; 21 MODULE_PARM_DESC(fbdev, "Enable fbdev compat layer"); 22 module_param(fbdev, bool, 0600); 23 24 /* 25 * fbdev funcs, to implement legacy fbdev interface on top of drm driver 26 */ 27 28 FB_GEN_DEFAULT_DEFERRED_SYSMEM_OPS(msm_fbdev, 29 drm_fb_helper_damage_range, 30 drm_fb_helper_damage_area) 31 32 static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma) 33 { 34 struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par; 35 struct drm_gem_object *bo = msm_framebuffer_bo(helper->fb, 0); 36 37 return drm_gem_prime_mmap(bo, vma); 38 } 39 40 static void msm_fbdev_fb_destroy(struct fb_info *info) 41 { 42 struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par; 43 struct drm_framebuffer *fb = helper->fb; 44 struct drm_gem_object *bo = msm_framebuffer_bo(fb, 0); 45 46 DBG(); 47 48 drm_fb_helper_fini(helper); 49 50 /* this will free the backing object */ 51 msm_gem_put_vaddr(bo); 52 drm_framebuffer_remove(fb); 53 54 drm_client_release(&helper->client); 55 } 56 57 static const struct fb_ops msm_fb_ops = { 58 .owner = THIS_MODULE, 59 __FB_DEFAULT_DEFERRED_OPS_RDWR(msm_fbdev), 60 DRM_FB_HELPER_DEFAULT_OPS, 61 __FB_DEFAULT_DEFERRED_OPS_DRAW(msm_fbdev), 62 .fb_mmap = msm_fbdev_mmap, 63 .fb_destroy = msm_fbdev_fb_destroy, 64 }; 65 66 static int msm_fbdev_fb_dirty(struct drm_fb_helper *helper, 67 struct drm_clip_rect *clip) 68 { 69 struct drm_device *dev = helper->dev; 70 int ret; 71 72 /* Call damage handlers only if necessary */ 73 if (!(clip->x1 < clip->x2 && clip->y1 < clip->y2)) 74 return 0; 75 76 if (helper->fb->funcs->dirty) { 77 ret = helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, clip, 1); 78 if (drm_WARN_ONCE(dev, ret, "Dirty helper failed: ret=%d\n", ret)) 79 return ret; 80 } 81 82 return 0; 83 } 84 85 static const struct drm_fb_helper_funcs msm_fbdev_helper_funcs = { 86 .fb_dirty = msm_fbdev_fb_dirty, 87 }; 88 89 int msm_fbdev_driver_fbdev_probe(struct drm_fb_helper *helper, 90 struct drm_fb_helper_surface_size *sizes) 91 { 92 struct drm_device *dev = helper->dev; 93 struct msm_drm_private *priv = dev->dev_private; 94 struct drm_framebuffer *fb = NULL; 95 struct drm_gem_object *bo; 96 struct fb_info *fbi = NULL; 97 uint64_t paddr; 98 uint32_t format; 99 int ret, pitch; 100 101 format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth); 102 103 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width, 104 sizes->surface_height, sizes->surface_bpp, 105 sizes->fb_width, sizes->fb_height); 106 107 pitch = align_pitch(sizes->surface_width, sizes->surface_bpp); 108 fb = msm_alloc_stolen_fb(dev, sizes->surface_width, 109 sizes->surface_height, pitch, format); 110 111 if (IS_ERR(fb)) { 112 DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n"); 113 return PTR_ERR(fb); 114 } 115 116 bo = msm_framebuffer_bo(fb, 0); 117 118 /* 119 * NOTE: if we can be guaranteed to be able to map buffer 120 * in panic (ie. lock-safe, etc) we could avoid pinning the 121 * buffer now: 122 */ 123 ret = msm_gem_get_and_pin_iova(bo, priv->kms->vm, &paddr); 124 if (ret) { 125 DRM_DEV_ERROR(dev->dev, "failed to get buffer obj iova: %d\n", ret); 126 goto fail; 127 } 128 129 fbi = drm_fb_helper_alloc_info(helper); 130 if (IS_ERR(fbi)) { 131 DRM_DEV_ERROR(dev->dev, "failed to allocate fb info\n"); 132 ret = PTR_ERR(fbi); 133 goto fail; 134 } 135 136 DBG("fbi=%p, dev=%p", fbi, dev); 137 138 helper->funcs = &msm_fbdev_helper_funcs; 139 helper->fb = fb; 140 141 fbi->fbops = &msm_fb_ops; 142 143 drm_fb_helper_fill_info(fbi, helper, sizes); 144 145 fbi->screen_buffer = msm_gem_get_vaddr(bo); 146 if (IS_ERR(fbi->screen_buffer)) { 147 ret = PTR_ERR(fbi->screen_buffer); 148 goto fail; 149 } 150 fbi->screen_size = bo->size; 151 fbi->fix.smem_start = paddr; 152 fbi->fix.smem_len = bo->size; 153 154 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres); 155 DBG("allocated %dx%d fb", fb->width, fb->height); 156 157 return 0; 158 159 fail: 160 drm_framebuffer_remove(fb); 161 return ret; 162 } 163