1 // SPDX-License-Identifier: GPL-2.0+ 2 3 #include <linux/crc32.h> 4 5 #include <drm/drm_atomic.h> 6 #include <drm/drm_atomic_helper.h> 7 #include <drm/drm_gem_framebuffer_helper.h> 8 #include <drm/drm_vblank.h> 9 10 #include "vkms_drv.h" 11 12 /** 13 * compute_crc - Compute CRC value on output frame 14 * 15 * @vaddr_out: address to final framebuffer 16 * @composer: framebuffer's metadata 17 * 18 * returns CRC value computed using crc32 on the visible portion of 19 * the final framebuffer at vaddr_out 20 */ 21 static uint32_t compute_crc(void *vaddr_out, struct vkms_composer *composer) 22 { 23 int i, j, src_offset; 24 int x_src = composer->src.x1 >> 16; 25 int y_src = composer->src.y1 >> 16; 26 int h_src = drm_rect_height(&composer->src) >> 16; 27 int w_src = drm_rect_width(&composer->src) >> 16; 28 u32 crc = 0; 29 30 for (i = y_src; i < y_src + h_src; ++i) { 31 for (j = x_src; j < x_src + w_src; ++j) { 32 src_offset = composer->offset 33 + (i * composer->pitch) 34 + (j * composer->cpp); 35 /* XRGB format ignores Alpha channel */ 36 memset(vaddr_out + src_offset + 24, 0, 8); 37 crc = crc32_le(crc, vaddr_out + src_offset, 38 sizeof(u32)); 39 } 40 } 41 42 return crc; 43 } 44 45 /** 46 * blend - belnd value at vaddr_src with value at vaddr_dst 47 * @vaddr_dst: destination address 48 * @vaddr_src: source address 49 * @dest_composer: destination framebuffer's metadata 50 * @src_composer: source framebuffer's metadata 51 * 52 * Blend value at vaddr_src with value at vaddr_dst. 53 * Currently, this function write value at vaddr_src on value 54 * at vaddr_dst using buffer's metadata to locate the new values 55 * from vaddr_src and their distenation at vaddr_dst. 56 * 57 * Todo: Use the alpha value to blend vaddr_src with vaddr_dst 58 * instead of overwriting it. 59 */ 60 static void blend(void *vaddr_dst, void *vaddr_src, 61 struct vkms_composer *dest_composer, 62 struct vkms_composer *src_composer) 63 { 64 int i, j, j_dst, i_dst; 65 int offset_src, offset_dst; 66 67 int x_src = src_composer->src.x1 >> 16; 68 int y_src = src_composer->src.y1 >> 16; 69 70 int x_dst = src_composer->dst.x1; 71 int y_dst = src_composer->dst.y1; 72 int h_dst = drm_rect_height(&src_composer->dst); 73 int w_dst = drm_rect_width(&src_composer->dst); 74 75 int y_limit = y_src + h_dst; 76 int x_limit = x_src + w_dst; 77 78 for (i = y_src, i_dst = y_dst; i < y_limit; ++i) { 79 for (j = x_src, j_dst = x_dst; j < x_limit; ++j) { 80 offset_dst = dest_composer->offset 81 + (i_dst * dest_composer->pitch) 82 + (j_dst++ * dest_composer->cpp); 83 offset_src = src_composer->offset 84 + (i * src_composer->pitch) 85 + (j * src_composer->cpp); 86 87 memcpy(vaddr_dst + offset_dst, 88 vaddr_src + offset_src, sizeof(u32)); 89 } 90 i_dst++; 91 } 92 } 93 94 static void compose_cursor(struct vkms_composer *cursor_composer, 95 struct vkms_composer *primary_composer, 96 void *vaddr_out) 97 { 98 struct drm_gem_object *cursor_obj; 99 struct vkms_gem_object *cursor_vkms_obj; 100 101 cursor_obj = drm_gem_fb_get_obj(&cursor_composer->fb, 0); 102 cursor_vkms_obj = drm_gem_to_vkms_gem(cursor_obj); 103 104 if (WARN_ON(!cursor_vkms_obj->vaddr)) 105 return; 106 107 blend(vaddr_out, cursor_vkms_obj->vaddr, 108 primary_composer, cursor_composer); 109 } 110 111 static uint32_t _vkms_get_crc(struct vkms_composer *primary_composer, 112 struct vkms_composer *cursor_composer) 113 { 114 struct drm_framebuffer *fb = &primary_composer->fb; 115 struct drm_gem_object *gem_obj = drm_gem_fb_get_obj(fb, 0); 116 struct vkms_gem_object *vkms_obj = drm_gem_to_vkms_gem(gem_obj); 117 void *vaddr_out = kzalloc(vkms_obj->gem.size, GFP_KERNEL); 118 u32 crc = 0; 119 120 if (!vaddr_out) { 121 DRM_ERROR("Failed to allocate memory for output frame."); 122 return 0; 123 } 124 125 if (WARN_ON(!vkms_obj->vaddr)) { 126 kfree(vaddr_out); 127 return crc; 128 } 129 130 memcpy(vaddr_out, vkms_obj->vaddr, vkms_obj->gem.size); 131 132 if (cursor_composer) 133 compose_cursor(cursor_composer, primary_composer, vaddr_out); 134 135 crc = compute_crc(vaddr_out, primary_composer); 136 137 kfree(vaddr_out); 138 139 return crc; 140 } 141 142 /** 143 * vkms_composer_worker - ordered work_struct to compute CRC 144 * 145 * @work: work_struct 146 * 147 * Work handler for composing and computing CRCs. work_struct scheduled in 148 * an ordered workqueue that's periodically scheduled to run by 149 * _vblank_handle() and flushed at vkms_atomic_crtc_destroy_state(). 150 */ 151 void vkms_composer_worker(struct work_struct *work) 152 { 153 struct vkms_crtc_state *crtc_state = container_of(work, 154 struct vkms_crtc_state, 155 composer_work); 156 struct drm_crtc *crtc = crtc_state->base.crtc; 157 struct vkms_output *out = drm_crtc_to_vkms_output(crtc); 158 struct vkms_composer *primary_composer = NULL; 159 struct vkms_composer *cursor_composer = NULL; 160 u32 crc32 = 0; 161 u64 frame_start, frame_end; 162 bool crc_pending; 163 164 spin_lock_irq(&out->composer_lock); 165 frame_start = crtc_state->frame_start; 166 frame_end = crtc_state->frame_end; 167 crc_pending = crtc_state->crc_pending; 168 crtc_state->frame_start = 0; 169 crtc_state->frame_end = 0; 170 crtc_state->crc_pending = false; 171 spin_unlock_irq(&out->composer_lock); 172 173 /* 174 * We raced with the vblank hrtimer and previous work already computed 175 * the crc, nothing to do. 176 */ 177 if (!crc_pending) 178 return; 179 180 if (crtc_state->num_active_planes >= 1) 181 primary_composer = crtc_state->active_planes[0]->composer; 182 183 if (crtc_state->num_active_planes == 2) 184 cursor_composer = crtc_state->active_planes[1]->composer; 185 186 if (primary_composer) 187 crc32 = _vkms_get_crc(primary_composer, cursor_composer); 188 189 /* 190 * The worker can fall behind the vblank hrtimer, make sure we catch up. 191 */ 192 while (frame_start <= frame_end) 193 drm_crtc_add_crc_entry(crtc, true, frame_start++, &crc32); 194 } 195 196 static const char * const pipe_crc_sources[] = {"auto"}; 197 198 const char *const *vkms_get_crc_sources(struct drm_crtc *crtc, 199 size_t *count) 200 { 201 *count = ARRAY_SIZE(pipe_crc_sources); 202 return pipe_crc_sources; 203 } 204 205 static int vkms_crc_parse_source(const char *src_name, bool *enabled) 206 { 207 int ret = 0; 208 209 if (!src_name) { 210 *enabled = false; 211 } else if (strcmp(src_name, "auto") == 0) { 212 *enabled = true; 213 } else { 214 *enabled = false; 215 ret = -EINVAL; 216 } 217 218 return ret; 219 } 220 221 int vkms_verify_crc_source(struct drm_crtc *crtc, const char *src_name, 222 size_t *values_cnt) 223 { 224 bool enabled; 225 226 if (vkms_crc_parse_source(src_name, &enabled) < 0) { 227 DRM_DEBUG_DRIVER("unknown source %s\n", src_name); 228 return -EINVAL; 229 } 230 231 *values_cnt = 1; 232 233 return 0; 234 } 235 236 int vkms_set_crc_source(struct drm_crtc *crtc, const char *src_name) 237 { 238 struct vkms_output *out = drm_crtc_to_vkms_output(crtc); 239 bool enabled = false; 240 int ret = 0; 241 242 ret = vkms_crc_parse_source(src_name, &enabled); 243 244 spin_lock_irq(&out->lock); 245 out->composer_enabled = enabled; 246 spin_unlock_irq(&out->lock); 247 248 return ret; 249 } 250