533 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Tegra host1x Syncpoints4 *5 * Copyright (c) 2010-2015, NVIDIA Corporation.6 */7 8#include <linux/module.h>9#include <linux/device.h>10#include <linux/dma-fence.h>11#include <linux/slab.h>12 13#include <trace/events/host1x.h>14 15#include "syncpt.h"16#include "dev.h"17#include "intr.h"18#include "debug.h"19 20#define SYNCPT_CHECK_PERIOD (2 * HZ)21#define MAX_STUCK_CHECK_COUNT 1522 23static struct host1x_syncpt_base *24host1x_syncpt_base_request(struct host1x *host)25{26 struct host1x_syncpt_base *bases = host->bases;27 unsigned int i;28 29 for (i = 0; i < host->info->nb_bases; i++)30 if (!bases[i].requested)31 break;32 33 if (i >= host->info->nb_bases)34 return NULL;35 36 bases[i].requested = true;37 return &bases[i];38}39 40static void host1x_syncpt_base_free(struct host1x_syncpt_base *base)41{42 if (base)43 base->requested = false;44}45 46/**47 * host1x_syncpt_alloc() - allocate a syncpoint48 * @host: host1x device data49 * @flags: bitfield of HOST1X_SYNCPT_* flags50 * @name: name for the syncpoint for use in debug prints51 *52 * Allocates a hardware syncpoint for the caller's use. The caller then has53 * the sole authority to mutate the syncpoint's value until it is freed again.54 *55 * If no free syncpoints are available, or a NULL name was specified, returns56 * NULL.57 */58struct host1x_syncpt *host1x_syncpt_alloc(struct host1x *host,59 unsigned long flags,60 const char *name)61{62 struct host1x_syncpt *sp = host->syncpt;63 char *full_name;64 unsigned int i;65 66 if (!name)67 return NULL;68 69 mutex_lock(&host->syncpt_mutex);70 71 for (i = 0; i < host->info->nb_pts && kref_read(&sp->ref); i++, sp++)72 ;73 74 if (i >= host->info->nb_pts)75 goto unlock;76 77 if (flags & HOST1X_SYNCPT_HAS_BASE) {78 sp->base = host1x_syncpt_base_request(host);79 if (!sp->base)80 goto unlock;81 }82 83 full_name = kasprintf(GFP_KERNEL, "%u-%s", sp->id, name);84 if (!full_name)85 goto free_base;86 87 sp->name = full_name;88 89 if (flags & HOST1X_SYNCPT_CLIENT_MANAGED)90 sp->client_managed = true;91 else92 sp->client_managed = false;93 94 kref_init(&sp->ref);95 96 mutex_unlock(&host->syncpt_mutex);97 return sp;98 99free_base:100 host1x_syncpt_base_free(sp->base);101 sp->base = NULL;102unlock:103 mutex_unlock(&host->syncpt_mutex);104 return NULL;105}106EXPORT_SYMBOL(host1x_syncpt_alloc);107 108/**109 * host1x_syncpt_id() - retrieve syncpoint ID110 * @sp: host1x syncpoint111 *112 * Given a pointer to a struct host1x_syncpt, retrieves its ID. This ID is113 * often used as a value to program into registers that control how hardware114 * blocks interact with syncpoints.115 */116u32 host1x_syncpt_id(struct host1x_syncpt *sp)117{118 return sp->id;119}120EXPORT_SYMBOL(host1x_syncpt_id);121 122/**123 * host1x_syncpt_incr_max() - update the value sent to hardware124 * @sp: host1x syncpoint125 * @incrs: number of increments126 */127u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs)128{129 return (u32)atomic_add_return(incrs, &sp->max_val);130}131EXPORT_SYMBOL(host1x_syncpt_incr_max);132 133 /*134 * Write cached syncpoint and waitbase values to hardware.135 */136void host1x_syncpt_restore(struct host1x *host)137{138 struct host1x_syncpt *sp_base = host->syncpt;139 unsigned int i;140 141 for (i = 0; i < host1x_syncpt_nb_pts(host); i++) {142 /*143 * Unassign syncpt from channels for purposes of Tegra186144 * syncpoint protection. This prevents any channel from145 * accessing it until it is reassigned.146 */147 host1x_hw_syncpt_assign_to_channel(host, sp_base + i, NULL);148 host1x_hw_syncpt_restore(host, sp_base + i);149 }150 151 for (i = 0; i < host1x_syncpt_nb_bases(host); i++)152 host1x_hw_syncpt_restore_wait_base(host, sp_base + i);153 154 host1x_hw_syncpt_enable_protection(host);155 156 wmb();157}158 159/*160 * Update the cached syncpoint and waitbase values by reading them161 * from the registers.162 */163void host1x_syncpt_save(struct host1x *host)164{165 struct host1x_syncpt *sp_base = host->syncpt;166 unsigned int i;167 168 for (i = 0; i < host1x_syncpt_nb_pts(host); i++) {169 if (host1x_syncpt_client_managed(sp_base + i))170 host1x_hw_syncpt_load(host, sp_base + i);171 else172 WARN_ON(!host1x_syncpt_idle(sp_base + i));173 }174 175 for (i = 0; i < host1x_syncpt_nb_bases(host); i++)176 host1x_hw_syncpt_load_wait_base(host, sp_base + i);177}178 179/*180 * Updates the cached syncpoint value by reading a new value from the hardware181 * register182 */183u32 host1x_syncpt_load(struct host1x_syncpt *sp)184{185 u32 val;186 187 val = host1x_hw_syncpt_load(sp->host, sp);188 trace_host1x_syncpt_load_min(sp->id, val);189 190 return val;191}192 193/*194 * Get the current syncpoint base195 */196u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp)197{198 host1x_hw_syncpt_load_wait_base(sp->host, sp);199 200 return sp->base_val;201}202 203/**204 * host1x_syncpt_incr() - increment syncpoint value from CPU, updating cache205 * @sp: host1x syncpoint206 */207int host1x_syncpt_incr(struct host1x_syncpt *sp)208{209 return host1x_hw_syncpt_cpu_incr(sp->host, sp);210}211EXPORT_SYMBOL(host1x_syncpt_incr);212 213/**214 * host1x_syncpt_wait() - wait for a syncpoint to reach a given value215 * @sp: host1x syncpoint216 * @thresh: threshold217 * @timeout: maximum time to wait for the syncpoint to reach the given value218 * @value: return location for the syncpoint value219 */220int host1x_syncpt_wait(struct host1x_syncpt *sp, u32 thresh, long timeout,221 u32 *value)222{223 struct dma_fence *fence;224 long wait_err;225 226 host1x_hw_syncpt_load(sp->host, sp);227 228 if (value)229 *value = host1x_syncpt_load(sp);230 231 if (host1x_syncpt_is_expired(sp, thresh))232 return 0;233 234 if (timeout < 0)235 timeout = LONG_MAX;236 else if (timeout == 0)237 return -EAGAIN;238 239 fence = host1x_fence_create(sp, thresh, false);240 if (IS_ERR(fence))241 return PTR_ERR(fence);242 243 wait_err = dma_fence_wait_timeout(fence, true, timeout);244 if (wait_err == 0)245 host1x_fence_cancel(fence);246 dma_fence_put(fence);247 248 if (value)249 *value = host1x_syncpt_load(sp);250 251 /*252 * Don't rely on dma_fence_wait_timeout return value,253 * since it returns zero both on timeout and if the254 * wait completed with 0 jiffies left.255 */256 host1x_hw_syncpt_load(sp->host, sp);257 if (wait_err == 0 && !host1x_syncpt_is_expired(sp, thresh))258 return -EAGAIN;259 else if (wait_err < 0)260 return wait_err;261 else262 return 0;263}264EXPORT_SYMBOL(host1x_syncpt_wait);265 266/*267 * Returns true if syncpoint is expired, false if we may need to wait268 */269bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh)270{271 u32 current_val;272 273 smp_rmb();274 275 current_val = (u32)atomic_read(&sp->min_val);276 277 return ((current_val - thresh) & 0x80000000U) == 0U;278}279 280int host1x_syncpt_init(struct host1x *host)281{282 struct host1x_syncpt_base *bases;283 struct host1x_syncpt *syncpt;284 unsigned int i;285 286 syncpt = devm_kcalloc(host->dev, host->info->nb_pts, sizeof(*syncpt),287 GFP_KERNEL);288 if (!syncpt)289 return -ENOMEM;290 291 bases = devm_kcalloc(host->dev, host->info->nb_bases, sizeof(*bases),292 GFP_KERNEL);293 if (!bases)294 return -ENOMEM;295 296 for (i = 0; i < host->info->nb_pts; i++) {297 syncpt[i].id = i;298 syncpt[i].host = host;299 }300 301 for (i = 0; i < host->info->nb_bases; i++)302 bases[i].id = i;303 304 mutex_init(&host->syncpt_mutex);305 host->syncpt = syncpt;306 host->bases = bases;307 308 /* Allocate sync point to use for clearing waits for expired fences */309 host->nop_sp = host1x_syncpt_alloc(host, 0, "reserved-nop");310 if (!host->nop_sp)311 return -ENOMEM;312 313 if (host->info->reserve_vblank_syncpts) {314 kref_init(&host->syncpt[26].ref);315 kref_init(&host->syncpt[27].ref);316 }317 318 return 0;319}320 321/**322 * host1x_syncpt_request() - request a syncpoint323 * @client: client requesting the syncpoint324 * @flags: flags325 *326 * host1x client drivers can use this function to allocate a syncpoint for327 * subsequent use. A syncpoint returned by this function will be reserved for328 * use by the client exclusively. When no longer using a syncpoint, a host1x329 * client driver needs to release it using host1x_syncpt_put().330 */331struct host1x_syncpt *host1x_syncpt_request(struct host1x_client *client,332 unsigned long flags)333{334 struct host1x *host = dev_get_drvdata(client->host->parent);335 336 return host1x_syncpt_alloc(host, flags, dev_name(client->dev));337}338EXPORT_SYMBOL(host1x_syncpt_request);339 340static void syncpt_release(struct kref *ref)341{342 struct host1x_syncpt *sp = container_of(ref, struct host1x_syncpt, ref);343 344 atomic_set(&sp->max_val, host1x_syncpt_read(sp));345 346 sp->locked = false;347 348 mutex_lock(&sp->host->syncpt_mutex);349 350 host1x_syncpt_base_free(sp->base);351 kfree(sp->name);352 sp->base = NULL;353 sp->name = NULL;354 sp->client_managed = false;355 356 mutex_unlock(&sp->host->syncpt_mutex);357}358 359/**360 * host1x_syncpt_put() - free a requested syncpoint361 * @sp: host1x syncpoint362 *363 * Release a syncpoint previously allocated using host1x_syncpt_request(). A364 * host1x client driver should call this when the syncpoint is no longer in365 * use.366 */367void host1x_syncpt_put(struct host1x_syncpt *sp)368{369 if (!sp)370 return;371 372 kref_put(&sp->ref, syncpt_release);373}374EXPORT_SYMBOL(host1x_syncpt_put);375 376void host1x_syncpt_deinit(struct host1x *host)377{378 struct host1x_syncpt *sp = host->syncpt;379 unsigned int i;380 381 for (i = 0; i < host->info->nb_pts; i++, sp++)382 kfree(sp->name);383}384 385/**386 * host1x_syncpt_read_max() - read maximum syncpoint value387 * @sp: host1x syncpoint388 *389 * The maximum syncpoint value indicates how many operations there are in390 * queue, either in channel or in a software thread.391 */392u32 host1x_syncpt_read_max(struct host1x_syncpt *sp)393{394 smp_rmb();395 396 return (u32)atomic_read(&sp->max_val);397}398EXPORT_SYMBOL(host1x_syncpt_read_max);399 400/**401 * host1x_syncpt_read_min() - read minimum syncpoint value402 * @sp: host1x syncpoint403 *404 * The minimum syncpoint value is a shadow of the current sync point value in405 * hardware.406 */407u32 host1x_syncpt_read_min(struct host1x_syncpt *sp)408{409 smp_rmb();410 411 return (u32)atomic_read(&sp->min_val);412}413EXPORT_SYMBOL(host1x_syncpt_read_min);414 415/**416 * host1x_syncpt_read() - read the current syncpoint value417 * @sp: host1x syncpoint418 */419u32 host1x_syncpt_read(struct host1x_syncpt *sp)420{421 return host1x_syncpt_load(sp);422}423EXPORT_SYMBOL(host1x_syncpt_read);424 425unsigned int host1x_syncpt_nb_pts(struct host1x *host)426{427 return host->info->nb_pts;428}429 430unsigned int host1x_syncpt_nb_bases(struct host1x *host)431{432 return host->info->nb_bases;433}434 435unsigned int host1x_syncpt_nb_mlocks(struct host1x *host)436{437 return host->info->nb_mlocks;438}439 440/**441 * host1x_syncpt_get_by_id() - obtain a syncpoint by ID442 * @host: host1x controller443 * @id: syncpoint ID444 */445struct host1x_syncpt *host1x_syncpt_get_by_id(struct host1x *host,446 unsigned int id)447{448 if (id >= host->info->nb_pts)449 return NULL;450 451 if (kref_get_unless_zero(&host->syncpt[id].ref))452 return &host->syncpt[id];453 else454 return NULL;455}456EXPORT_SYMBOL(host1x_syncpt_get_by_id);457 458/**459 * host1x_syncpt_get_by_id_noref() - obtain a syncpoint by ID but don't460 * increase the refcount.461 * @host: host1x controller462 * @id: syncpoint ID463 */464struct host1x_syncpt *host1x_syncpt_get_by_id_noref(struct host1x *host,465 unsigned int id)466{467 if (id >= host->info->nb_pts)468 return NULL;469 470 return &host->syncpt[id];471}472EXPORT_SYMBOL(host1x_syncpt_get_by_id_noref);473 474/**475 * host1x_syncpt_get() - increment syncpoint refcount476 * @sp: syncpoint477 */478struct host1x_syncpt *host1x_syncpt_get(struct host1x_syncpt *sp)479{480 kref_get(&sp->ref);481 482 return sp;483}484EXPORT_SYMBOL(host1x_syncpt_get);485 486/**487 * host1x_syncpt_get_base() - obtain the wait base associated with a syncpoint488 * @sp: host1x syncpoint489 */490struct host1x_syncpt_base *host1x_syncpt_get_base(struct host1x_syncpt *sp)491{492 return sp ? sp->base : NULL;493}494EXPORT_SYMBOL(host1x_syncpt_get_base);495 496/**497 * host1x_syncpt_base_id() - retrieve the ID of a syncpoint wait base498 * @base: host1x syncpoint wait base499 */500u32 host1x_syncpt_base_id(struct host1x_syncpt_base *base)501{502 return base->id;503}504EXPORT_SYMBOL(host1x_syncpt_base_id);505 506static void do_nothing(struct kref *ref)507{508}509 510/**511 * host1x_syncpt_release_vblank_reservation() - Make VBLANK syncpoint512 * available for allocation513 *514 * @client: host1x bus client515 * @syncpt_id: syncpoint ID to make available516 *517 * Makes VBLANK<i> syncpoint available for allocatation if it was518 * reserved at initialization time. This should be called by the display519 * driver after it has ensured that any VBLANK increment programming configured520 * by the boot chain has been disabled.521 */522void host1x_syncpt_release_vblank_reservation(struct host1x_client *client,523 u32 syncpt_id)524{525 struct host1x *host = dev_get_drvdata(client->host->parent);526 527 if (!host->info->reserve_vblank_syncpts)528 return;529 530 kref_put(&host->syncpt[syncpt_id].ref, do_nothing);531}532EXPORT_SYMBOL(host1x_syncpt_release_vblank_reservation);533