1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Tegra host1x Interrupt Management
*
* Copyright (c) 2010-2013, NVIDIA Corporation.
*/
#include <linux/clk.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/irq.h>
#include <trace/events/host1x.h>
#include "channel.h"
#include "dev.h"
#include "fence.h"
#include "intr.h"
/* Wait list management */
enum waitlist_state {
WLS_PENDING,
WLS_REMOVED,
WLS_CANCELLED,
WLS_HANDLED
};
static void waiter_release(struct kref *kref)
{
kfree(container_of(kref, struct host1x_waitlist, refcount));
}
/*
* add a waiter to a waiter queue, sorted by threshold
* returns true if it was added at the head of the queue
*/
static bool add_waiter_to_queue(struct host1x_waitlist *waiter,
struct list_head *queue)
{
struct host1x_waitlist *pos;
u32 thresh = waiter->thresh;
list_for_each_entry_reverse(pos, queue, list)
if ((s32)(pos->thresh - thresh) <= 0) {
list_add(&waiter->list, &pos->list);
return false;
}
list_add(&waiter->list, queue);
return true;
}
/*
* run through a waiter queue for a single sync point ID
* and gather all completed waiters into lists by actions
*/
static void remove_completed_waiters(struct list_head *head, u32 sync,
struct list_head completed[HOST1X_INTR_ACTION_COUNT])
{
struct list_head *dest;
struct host1x_waitlist *waiter, *next, *prev;
list_for_each_entry_safe(waiter, next, head, list) {
if ((s32)(waiter->thresh - sync) > 0)
break;
dest = completed + waiter->action;
/* consolidate submit cleanups */
if (waiter->action == HOST1X_INTR_ACTION_SUBMIT_COMPLETE &&
!list_empty(dest)) {
prev = list_entry(dest->prev,
struct host1x_waitlist, list);
if (prev->data == waiter->data) {
prev->count++;
dest = NULL;
}
}
/* PENDING->REMOVED or CANCELLED->HANDLED */
if (atomic_inc_return(&waiter->state) == WLS_HANDLED || !dest) {
list_del(&waiter->list);
kref_put(&waiter->refcount, waiter_release);
} else
list_move_tail(&waiter->list, dest);
}
}
static void reset_threshold_interrupt(struct host1x *host,
struct list_head *head,
unsigned int id)
{
u32 thresh =
list_first_entry(head, struct host1x_waitlist, list)->thresh;
host1x_hw_intr_set_syncpt_threshold(host, id, thresh);
host1x_hw_intr_enable_syncpt_intr(host, id);
}
static void action_submit_complete(struct host1x_waitlist *waiter)
{
struct host1x_channel *channel = waiter->data;
host1x_cdma_update(&channel->cdma);
/* Add nr_completed to trace */
trace_host1x_channel_submit_complete(dev_name(channel->dev),
waiter->count, waiter->thresh);
}
static void action_wakeup(struct host1x_waitlist *waiter)
{
wait_queue_head_t *wq = waiter->data;
wake_up(wq);
}
static void action_wakeup_interruptible(struct host1x_waitlist *waiter)
{
wait_queue_head_t *wq = waiter->data;
wake_up_interruptible(wq);
}
static void action_signal_fence(struct host1x_waitlist *waiter)
{
struct host1x_syncpt_fence *f = waiter->data;
host1x_fence_signal(f);
}
typedef void (*action_handler)(struct host1x_waitlist *waiter);
static const action_handler action_handlers[HOST1X_INTR_ACTION_COUNT] = {
action_submit_complete,
action_wakeup,
action_wakeup_interruptible,
action_signal_fence,
};
static void run_handlers(struct list_head completed[HOST1X_INTR_ACTION_COUNT])
{
struct list_head *head = completed;
unsigned int i;
for (i = 0; i < HOST1X_INTR_ACTION_COUNT; ++i, ++head) {
action_handler handler = action_handlers[i];
struct host1x_waitlist *waiter, *next;
list_for_each_entry_safe(waiter, next, head, list) {
list_del(&waiter->list);
handler(waiter);
WARN_ON(atomic_xchg(&waiter->state, WLS_HANDLED) !=
WLS_REMOVED);
kref_put(&waiter->refcount, waiter_release);
}
}
}
/*
* Remove & handle all waiters that have completed for the given syncpt
*/
static int process_wait_list(struct host1x *host,
struct host1x_syncpt *syncpt,
u32 threshold)
{
struct list_head completed[HOST1X_INTR_ACTION_COUNT];
unsigned int i;
int empty;
for (i = 0; i < HOST1X_INTR_ACTION_COUNT; ++i)
INIT_LIST_HEAD(completed + i);
spin_lock(&syncpt->intr.lock);
remove_completed_waiters(&syncpt->intr.wait_head, threshold,
completed);
empty = list_empty(&syncpt->intr.wait_head);
if (empty)
host1x_hw_intr_disable_syncpt_intr(host, syncpt->id);
else
reset_threshold_interrupt(host, &syncpt->intr.wait_head,
syncpt->id);
spin_unlock(&syncpt->intr.lock);
run_handlers(completed);
return empty;
}
/*
* Sync point threshold interrupt service thread function
* Handles sync point threshold triggers, in thread context
*/
static void syncpt_thresh_work(struct work_struct *work)
{
struct host1x_syncpt_intr *syncpt_intr =
container_of(work, struct host1x_syncpt_intr, work);
struct host1x_syncpt *syncpt =
container_of(syncpt_intr, struct host1x_syncpt, intr);
unsigned int id = syncpt->id;
struct host1x *host = syncpt->host;
(void)process_wait_list(host, syncpt,
host1x_syncpt_load(host->syncpt + id));
}
int host1x_intr_add_action(struct host1x *host, struct host1x_syncpt *syncpt,
u32 thresh, enum host1x_intr_action action,
void *data, struct host1x_waitlist *waiter,
void **ref)
{
int queue_was_empty;
if (waiter == NULL) {
pr_warn("%s: NULL waiter\n", __func__);
return -EINVAL;
}
/* initialize a new waiter */
INIT_LIST_HEAD(&waiter->list);
kref_init(&waiter->refcount);
if (ref)
kref_get(&waiter->refcount);
waiter->thresh = thresh;
waiter->action = action;
atomic_set(&waiter->state, WLS_PENDING);
waiter->data = data;
waiter->count = 1;
spin_lock(&syncpt->intr.lock);
queue_was_empty = list_empty(&syncpt->intr.wait_head);
if (add_waiter_to_queue(waiter, &syncpt->intr.wait_head)) {
/* added at head of list - new threshold value */
host1x_hw_intr_set_syncpt_threshold(host, syncpt->id, thresh);
/* added as first waiter - enable interrupt */
if (queue_was_empty)
host1x_hw_intr_enable_syncpt_intr(host, syncpt->id);
}
if (ref)
*ref = waiter;
spin_unlock(&syncpt->intr.lock);
return 0;
}
void host1x_intr_put_ref(struct host1x *host, unsigned int id, void *ref,
bool flush)
{
struct host1x_waitlist *waiter = ref;
struct host1x_syncpt *syncpt;
atomic_cmpxchg(&waiter->state, WLS_PENDING, WLS_CANCELLED);
syncpt = host->syncpt + id;
spin_lock(&syncpt->intr.lock);
if (atomic_cmpxchg(&waiter->state, WLS_CANCELLED, WLS_HANDLED) ==
WLS_CANCELLED) {
list_del(&waiter->list);
kref_put(&waiter->refcount, waiter_release);
}
spin_unlock(&syncpt->intr.lock);
if (flush) {
/* Wait until any concurrently executing handler has finished. */
while (atomic_read(&waiter->state) != WLS_HANDLED)
schedule();
}
kref_put(&waiter->refcount, waiter_release);
}
int host1x_intr_init(struct host1x *host, unsigned int irq_sync)
{
unsigned int id;
u32 nb_pts = host1x_syncpt_nb_pts(host);
mutex_init(&host->intr_mutex);
host->intr_syncpt_irq = irq_sync;
for (id = 0; id < nb_pts; ++id) {
struct host1x_syncpt *syncpt = host->syncpt + id;
spin_lock_init(&syncpt->intr.lock);
INIT_LIST_HEAD(&syncpt->intr.wait_head);
snprintf(syncpt->intr.thresh_irq_name,
sizeof(syncpt->intr.thresh_irq_name),
"host1x_sp_%02u", id);
}
return 0;
}
void host1x_intr_deinit(struct host1x *host)
{
}
void host1x_intr_start(struct host1x *host)
{
u32 hz = clk_get_rate(host->clk);
int err;
mutex_lock(&host->intr_mutex);
err = host1x_hw_intr_init_host_sync(host, DIV_ROUND_UP(hz, 1000000),
syncpt_thresh_work);
if (err) {
mutex_unlock(&host->intr_mutex);
return;
}
mutex_unlock(&host->intr_mutex);
}
void host1x_intr_stop(struct host1x *host)
{
unsigned int id;
struct host1x_syncpt *syncpt = host->syncpt;
u32 nb_pts = host1x_syncpt_nb_pts(host);
mutex_lock(&host->intr_mutex);
host1x_hw_intr_disable_all_syncpt_intrs(host);
for (id = 0; id < nb_pts; ++id) {
struct host1x_waitlist *waiter, *next;
list_for_each_entry_safe(waiter, next,
&syncpt[id].intr.wait_head, list) {
if (atomic_cmpxchg(&waiter->state,
WLS_CANCELLED, WLS_HANDLED) == WLS_CANCELLED) {
list_del(&waiter->list);
kref_put(&waiter->refcount, waiter_release);
}
}
if (!list_empty(&syncpt[id].intr.wait_head)) {
/* output diagnostics */
mutex_unlock(&host->intr_mutex);
pr_warn("%s cannot stop syncpt intr id=%u\n",
__func__, id);
return;
}
}
host1x_hw_intr_free_syncpt_irq(host);
mutex_unlock(&host->intr_mutex);
}
|