1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2014, The Linux Foundation. All rights reserved. 4 * Copyright (C) 2013 Red Hat 5 * Author: Rob Clark <robdclark@gmail.com> 6 */ 7 8 #include <drm/drm_fourcc.h> 9 #include <drm/drm_util.h> 10 11 #include "mdp5_kms.h" 12 #include "mdp5_smp.h" 13 14 15 struct mdp5_smp { 16 struct drm_device *dev; 17 18 uint8_t reserved[MAX_CLIENTS]; /* fixed MMBs allocation per client */ 19 20 int blk_cnt; 21 int blk_size; 22 23 /* register cache */ 24 u32 alloc_w[22]; 25 u32 alloc_r[22]; 26 u32 pipe_reqprio_fifo_wm0[SSPP_MAX]; 27 u32 pipe_reqprio_fifo_wm1[SSPP_MAX]; 28 u32 pipe_reqprio_fifo_wm2[SSPP_MAX]; 29 }; 30 31 static inline 32 struct mdp5_kms *get_kms(struct mdp5_smp *smp) 33 { 34 struct msm_drm_private *priv = smp->dev->dev_private; 35 36 return to_mdp5_kms(to_mdp_kms(priv->kms)); 37 } 38 39 static inline u32 pipe2client(enum mdp5_pipe pipe, int plane) 40 { 41 #define CID_UNUSED 0 42 43 if (WARN_ON(plane >= pipe2nclients(pipe))) 44 return CID_UNUSED; 45 46 /* 47 * Note on SMP clients: 48 * For ViG pipes, fetch Y/Cr/Cb-components clients are always 49 * consecutive, and in that order. 50 * 51 * e.g.: 52 * if mdp5_cfg->smp.clients[SSPP_VIG0] = N, 53 * Y plane's client ID is N 54 * Cr plane's client ID is N + 1 55 * Cb plane's client ID is N + 2 56 */ 57 58 return mdp5_cfg->smp.clients[pipe] + plane; 59 } 60 61 /* allocate blocks for the specified request: */ 62 static int smp_request_block(struct mdp5_smp *smp, 63 struct mdp5_smp_state *state, 64 u32 cid, int nblks) 65 { 66 void *cs = state->client_state[cid]; 67 int i, avail, cnt = smp->blk_cnt; 68 uint8_t reserved; 69 70 /* we shouldn't be requesting blocks for an in-use client: */ 71 WARN_ON(!bitmap_empty(cs, cnt)); 72 73 reserved = smp->reserved[cid]; 74 75 if (reserved) { 76 nblks = max(0, nblks - reserved); 77 DBG("%d MMBs allocated (%d reserved)", nblks, reserved); 78 } 79 80 avail = cnt - bitmap_weight(state->state, cnt); 81 if (nblks > avail) { 82 DRM_DEV_ERROR(smp->dev->dev, "out of blks (req=%d > avail=%d)\n", 83 nblks, avail); 84 return -ENOSPC; 85 } 86 87 for (i = 0; i < nblks; i++) { 88 int blk = find_first_zero_bit(state->state, cnt); 89 set_bit(blk, cs); 90 set_bit(blk, state->state); 91 } 92 93 return 0; 94 } 95 96 static void set_fifo_thresholds(struct mdp5_smp *smp, 97 enum mdp5_pipe pipe, int nblks) 98 { 99 u32 smp_entries_per_blk = smp->blk_size / (128 / BITS_PER_BYTE); 100 u32 val; 101 102 /* 1/4 of SMP pool that is being fetched */ 103 val = (nblks * smp_entries_per_blk) / 4; 104 105 smp->pipe_reqprio_fifo_wm0[pipe] = val * 1; 106 smp->pipe_reqprio_fifo_wm1[pipe] = val * 2; 107 smp->pipe_reqprio_fifo_wm2[pipe] = val * 3; 108 } 109 110 /* 111 * NOTE: looks like if horizontal decimation is used (if we supported that) 112 * then the width used to calculate SMP block requirements is the post- 113 * decimated width. Ie. SMP buffering sits downstream of decimation (which 114 * presumably happens during the dma from scanout buffer). 115 */ 116 uint32_t mdp5_smp_calculate(struct mdp5_smp *smp, 117 const struct msm_format *format, 118 u32 width, bool hdecim) 119 { 120 const struct drm_format_info *info = drm_format_info(format->pixel_format); 121 struct mdp5_kms *mdp5_kms = get_kms(smp); 122 int rev = mdp5_cfg_get_hw_rev(mdp5_kms->cfg); 123 int i, hsub, nplanes, nlines; 124 uint32_t blkcfg = 0; 125 126 nplanes = info->num_planes; 127 hsub = info->hsub; 128 129 /* different if BWC (compressed framebuffer?) enabled: */ 130 nlines = 2; 131 132 /* Newer MDPs have split/packing logic, which fetches sub-sampled 133 * U and V components (splits them from Y if necessary) and packs 134 * them together, writes to SMP using a single client. 135 */ 136 if ((rev > 0) && (format->chroma_sample > CHROMA_FULL)) { 137 nplanes = 2; 138 139 /* if decimation is enabled, HW decimates less on the 140 * sub sampled chroma components 141 */ 142 if (hdecim && (hsub > 1)) 143 hsub = 1; 144 } 145 146 for (i = 0; i < nplanes; i++) { 147 int n, fetch_stride, cpp; 148 149 cpp = info->cpp[i]; 150 fetch_stride = width * cpp / (i ? hsub : 1); 151 152 n = DIV_ROUND_UP(fetch_stride * nlines, smp->blk_size); 153 154 /* for hw rev v1.00 */ 155 if (rev == 0) 156 n = roundup_pow_of_two(n); 157 158 blkcfg |= (n << (8 * i)); 159 } 160 161 return blkcfg; 162 } 163 164 int mdp5_smp_assign(struct mdp5_smp *smp, struct mdp5_smp_state *state, 165 enum mdp5_pipe pipe, uint32_t blkcfg) 166 { 167 struct mdp5_kms *mdp5_kms = get_kms(smp); 168 struct drm_device *dev = mdp5_kms->dev; 169 int i, ret; 170 171 for (i = 0; i < pipe2nclients(pipe); i++) { 172 u32 cid = pipe2client(pipe, i); 173 int n = blkcfg & 0xff; 174 175 if (!n) 176 continue; 177 178 DBG("%s[%d]: request %d SMP blocks", pipe2name(pipe), i, n); 179 ret = smp_request_block(smp, state, cid, n); 180 if (ret) { 181 DRM_DEV_ERROR(dev->dev, "Cannot allocate %d SMP blocks: %d\n", 182 n, ret); 183 return ret; 184 } 185 186 blkcfg >>= 8; 187 } 188 189 state->assigned |= (1 << pipe); 190 191 return 0; 192 } 193 194 /* Release SMP blocks for all clients of the pipe */ 195 void mdp5_smp_release(struct mdp5_smp *smp, struct mdp5_smp_state *state, 196 enum mdp5_pipe pipe) 197 { 198 int i; 199 int cnt = smp->blk_cnt; 200 201 for (i = 0; i < pipe2nclients(pipe); i++) { 202 u32 cid = pipe2client(pipe, i); 203 void *cs = state->client_state[cid]; 204 205 /* update global state: */ 206 bitmap_andnot(state->state, state->state, cs, cnt); 207 208 /* clear client's state */ 209 bitmap_zero(cs, cnt); 210 } 211 212 state->released |= (1 << pipe); 213 } 214 215 /* NOTE: SMP_ALLOC_* regs are *not* double buffered, so release has to 216 * happen after scanout completes. 217 */ 218 static unsigned update_smp_state(struct mdp5_smp *smp, 219 u32 cid, mdp5_smp_state_t *assigned) 220 { 221 int cnt = smp->blk_cnt; 222 unsigned nblks = 0; 223 u32 blk, val; 224 225 for_each_set_bit(blk, *assigned, cnt) { 226 int idx = blk / 3; 227 int fld = blk % 3; 228 229 val = smp->alloc_w[idx]; 230 231 switch (fld) { 232 case 0: 233 val &= ~MDP5_SMP_ALLOC_W_REG_CLIENT0__MASK; 234 val |= MDP5_SMP_ALLOC_W_REG_CLIENT0(cid); 235 break; 236 case 1: 237 val &= ~MDP5_SMP_ALLOC_W_REG_CLIENT1__MASK; 238 val |= MDP5_SMP_ALLOC_W_REG_CLIENT1(cid); 239 break; 240 case 2: 241 val &= ~MDP5_SMP_ALLOC_W_REG_CLIENT2__MASK; 242 val |= MDP5_SMP_ALLOC_W_REG_CLIENT2(cid); 243 break; 244 } 245 246 smp->alloc_w[idx] = val; 247 smp->alloc_r[idx] = val; 248 249 nblks++; 250 } 251 252 return nblks; 253 } 254 255 static void write_smp_alloc_regs(struct mdp5_smp *smp) 256 { 257 struct mdp5_kms *mdp5_kms = get_kms(smp); 258 int i, num_regs; 259 260 num_regs = smp->blk_cnt / 3 + 1; 261 262 for (i = 0; i < num_regs; i++) { 263 mdp5_write(mdp5_kms, REG_MDP5_SMP_ALLOC_W_REG(i), 264 smp->alloc_w[i]); 265 mdp5_write(mdp5_kms, REG_MDP5_SMP_ALLOC_R_REG(i), 266 smp->alloc_r[i]); 267 } 268 } 269 270 static void write_smp_fifo_regs(struct mdp5_smp *smp) 271 { 272 struct mdp5_kms *mdp5_kms = get_kms(smp); 273 int i; 274 275 for (i = 0; i < mdp5_kms->num_hwpipes; i++) { 276 struct mdp5_hw_pipe *hwpipe = mdp5_kms->hwpipes[i]; 277 enum mdp5_pipe pipe = hwpipe->pipe; 278 279 mdp5_write(mdp5_kms, REG_MDP5_PIPE_REQPRIO_FIFO_WM_0(pipe), 280 smp->pipe_reqprio_fifo_wm0[pipe]); 281 mdp5_write(mdp5_kms, REG_MDP5_PIPE_REQPRIO_FIFO_WM_1(pipe), 282 smp->pipe_reqprio_fifo_wm1[pipe]); 283 mdp5_write(mdp5_kms, REG_MDP5_PIPE_REQPRIO_FIFO_WM_2(pipe), 284 smp->pipe_reqprio_fifo_wm2[pipe]); 285 } 286 } 287 288 void mdp5_smp_prepare_commit(struct mdp5_smp *smp, struct mdp5_smp_state *state) 289 { 290 enum mdp5_pipe pipe; 291 292 for_each_set_bit(pipe, &state->assigned, sizeof(state->assigned) * 8) { 293 unsigned i, nblks = 0; 294 295 for (i = 0; i < pipe2nclients(pipe); i++) { 296 u32 cid = pipe2client(pipe, i); 297 void *cs = state->client_state[cid]; 298 299 nblks += update_smp_state(smp, cid, cs); 300 301 DBG("assign %s:%u, %u blks", 302 pipe2name(pipe), i, nblks); 303 } 304 305 set_fifo_thresholds(smp, pipe, nblks); 306 } 307 308 write_smp_alloc_regs(smp); 309 write_smp_fifo_regs(smp); 310 311 state->assigned = 0; 312 } 313 314 void mdp5_smp_complete_commit(struct mdp5_smp *smp, struct mdp5_smp_state *state) 315 { 316 enum mdp5_pipe pipe; 317 318 for_each_set_bit(pipe, &state->released, sizeof(state->released) * 8) { 319 DBG("release %s", pipe2name(pipe)); 320 set_fifo_thresholds(smp, pipe, 0); 321 } 322 323 write_smp_fifo_regs(smp); 324 325 state->released = 0; 326 } 327 328 void mdp5_smp_dump(struct mdp5_smp *smp, struct drm_printer *p, 329 struct mdp5_global_state *global_state) 330 { 331 struct mdp5_kms *mdp5_kms = get_kms(smp); 332 struct mdp5_hw_pipe_state *hwpstate; 333 struct mdp5_smp_state *state; 334 int total = 0, i, j; 335 336 drm_printf(p, "name\tinuse\tplane\n"); 337 drm_printf(p, "----\t-----\t-----\n"); 338 339 /* grab these *after* we hold the state_lock */ 340 hwpstate = &global_state->hwpipe; 341 state = &global_state->smp; 342 343 for (i = 0; i < mdp5_kms->num_hwpipes; i++) { 344 struct mdp5_hw_pipe *hwpipe = mdp5_kms->hwpipes[i]; 345 struct drm_plane *plane = hwpstate->hwpipe_to_plane[hwpipe->idx]; 346 enum mdp5_pipe pipe = hwpipe->pipe; 347 for (j = 0; j < pipe2nclients(pipe); j++) { 348 u32 cid = pipe2client(pipe, j); 349 void *cs = state->client_state[cid]; 350 int inuse = bitmap_weight(cs, smp->blk_cnt); 351 352 drm_printf(p, "%s:%d\t%d\t%s\n", 353 pipe2name(pipe), j, inuse, 354 plane ? plane->name : "(null)"); 355 356 total += inuse; 357 } 358 } 359 360 drm_printf(p, "TOTAL:\t%d\t(of %d)\n", total, smp->blk_cnt); 361 drm_printf(p, "AVAIL:\t%d\n", smp->blk_cnt - 362 bitmap_weight(state->state, smp->blk_cnt)); 363 } 364 365 366 struct mdp5_smp *mdp5_smp_init(struct mdp5_kms *mdp5_kms, const struct mdp5_smp_block *cfg) 367 { 368 struct drm_device *dev = mdp5_kms->dev; 369 struct mdp5_smp_state *state; 370 struct mdp5_global_state *global_state; 371 struct mdp5_smp *smp; 372 373 smp = devm_kzalloc(dev->dev, sizeof(*smp), GFP_KERNEL); 374 if (unlikely(!smp)) 375 return ERR_PTR(-ENOMEM); 376 377 smp->dev = mdp5_kms->dev; 378 smp->blk_cnt = cfg->mmb_count; 379 smp->blk_size = cfg->mmb_size; 380 381 global_state = mdp5_get_existing_global_state(mdp5_kms); 382 state = &global_state->smp; 383 384 /* statically tied MMBs cannot be re-allocated: */ 385 bitmap_copy(state->state, cfg->reserved_state, smp->blk_cnt); 386 memcpy(smp->reserved, cfg->reserved, sizeof(smp->reserved)); 387 388 return smp; 389 } 390