From 24a4262afb10907fce3cdbc3ae336fcf4cdaece5 Mon Sep 17 00:00:00 2001 From: Michael Zoran Date: Wed, 19 Oct 2016 15:58:34 -0700 Subject: [PATCH] staging: vc04_services: Convert pointers in shared state to offsets The arm processor core and the GPU have a shared data structure. This structure contains pointers to base linux kernel objects such as events. The size of the pointer changes between 32 bit and 64 bit, so it is necessary to convert these pointers to offsets from the beginning of the state structure. Luckly, the GPU does not interpret these pointers/offsets, but this change is necessary to keep the structure the same since the GPU code is outside the scope of the linux kernel and can't be easily changed. Signed-off-by: Michael Zoran Reviewed-by: Eric Anholt Signed-off-by: Greg Kroah-Hartman --- .../interface/vchiq_arm/vchiq_core.c | 54 ++++++++++--------- .../interface/vchiq_arm/vchiq_core.h | 3 +- 2 files changed, 30 insertions(+), 27 deletions(-) diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c index 05954f983125..3aa5cc4f8576 100644 --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c @@ -406,22 +406,24 @@ vchiq_set_conn_state(VCHIQ_STATE_T *state, VCHIQ_CONNSTATE_T newstate) } static inline void -remote_event_create(REMOTE_EVENT_T *event) +remote_event_create(VCHIQ_STATE_T *state, REMOTE_EVENT_T *event) { event->armed = 0; /* Don't clear the 'fired' flag because it may already have been set ** by the other side. */ - sema_init(event->event, 0); + sema_init((struct semaphore *)((char *)state + event->event), 0); } static inline int -remote_event_wait(REMOTE_EVENT_T *event) +remote_event_wait(VCHIQ_STATE_T *state, REMOTE_EVENT_T *event) { if (!event->fired) { event->armed = 1; dsb(sy); if (!event->fired) { - if (down_interruptible(event->event) != 0) { + if (down_interruptible( + (struct semaphore *) + ((char *)state + event->event)) != 0) { event->armed = 0; return 0; } @@ -435,26 +437,26 @@ remote_event_wait(REMOTE_EVENT_T *event) } static inline void -remote_event_signal_local(REMOTE_EVENT_T *event) +remote_event_signal_local(VCHIQ_STATE_T *state, REMOTE_EVENT_T *event) { event->armed = 0; - up(event->event); + up((struct semaphore *)((char *)state + event->event)); } static inline void -remote_event_poll(REMOTE_EVENT_T *event) +remote_event_poll(VCHIQ_STATE_T *state, REMOTE_EVENT_T *event) { if (event->fired && event->armed) - remote_event_signal_local(event); + remote_event_signal_local(state, event); } void remote_event_pollall(VCHIQ_STATE_T *state) { - remote_event_poll(&state->local->sync_trigger); - remote_event_poll(&state->local->sync_release); - remote_event_poll(&state->local->trigger); - remote_event_poll(&state->local->recycle); + remote_event_poll(state, &state->local->sync_trigger); + remote_event_poll(state, &state->local->sync_release); + remote_event_poll(state, &state->local->trigger); + remote_event_poll(state, &state->local->recycle); } /* Round up message sizes so that any space at the end of a slot is always big @@ -535,7 +537,7 @@ request_poll(VCHIQ_STATE_T *state, VCHIQ_SERVICE_T *service, int poll_type) wmb(); /* ... and ensure the slot handler runs. */ - remote_event_signal_local(&state->local->trigger); + remote_event_signal_local(state, &state->local->trigger); } /* Called from queue_message, by the slot handler and application threads, @@ -976,7 +978,7 @@ queue_message_sync(VCHIQ_STATE_T *state, VCHIQ_SERVICE_T *service, (mutex_lock_interruptible(&state->sync_mutex) != 0)) return VCHIQ_RETRY; - remote_event_wait(&local->sync_release); + remote_event_wait(state, &local->sync_release); rmb(); @@ -1995,7 +1997,7 @@ slot_handler_func(void *v) while (1) { DEBUG_COUNT(SLOT_HANDLER_COUNT); DEBUG_TRACE(SLOT_HANDLER_LINE); - remote_event_wait(&local->trigger); + remote_event_wait(state, &local->trigger); rmb(); @@ -2084,7 +2086,7 @@ recycle_func(void *v) VCHIQ_SHARED_STATE_T *local = state->local; while (1) { - remote_event_wait(&local->recycle); + remote_event_wait(state, &local->recycle); process_free_queue(state); } @@ -2107,7 +2109,7 @@ sync_func(void *v) int type; unsigned int localport, remoteport; - remote_event_wait(&local->sync_trigger); + remote_event_wait(state, &local->sync_trigger); rmb(); @@ -2406,24 +2408,24 @@ vchiq_init_state(VCHIQ_STATE_T *state, VCHIQ_SLOT_ZERO_T *slot_zero, state->data_use_count = 0; state->data_quota = state->slot_queue_available - 1; - local->trigger.event = &state->trigger_event; - remote_event_create(&local->trigger); + local->trigger.event = offsetof(VCHIQ_STATE_T, trigger_event); + remote_event_create(state, &local->trigger); local->tx_pos = 0; - local->recycle.event = &state->recycle_event; - remote_event_create(&local->recycle); + local->recycle.event = offsetof(VCHIQ_STATE_T, recycle_event); + remote_event_create(state, &local->recycle); local->slot_queue_recycle = state->slot_queue_available; - local->sync_trigger.event = &state->sync_trigger_event; - remote_event_create(&local->sync_trigger); + local->sync_trigger.event = offsetof(VCHIQ_STATE_T, sync_trigger_event); + remote_event_create(state, &local->sync_trigger); - local->sync_release.event = &state->sync_release_event; - remote_event_create(&local->sync_release); + local->sync_release.event = offsetof(VCHIQ_STATE_T, sync_release_event); + remote_event_create(state, &local->sync_release); /* At start-of-day, the slot is empty and available */ ((VCHIQ_HEADER_T *)SLOT_DATA_FROM_INDEX(state, local->slot_sync))->msgid = VCHIQ_MSGID_PADDING; - remote_event_signal_local(&local->sync_release); + remote_event_signal_local(state, &local->sync_release); local->debug[DEBUG_ENTRIES] = DEBUG_MAX; diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h index 9013bdbf242c..1c2b1b5b8cc9 100644 --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h @@ -264,7 +264,8 @@ typedef struct vchiq_bulk_queue_struct { typedef struct remote_event_struct { int armed; int fired; - struct semaphore *event; + /* Contains offset from the beginning of the VCHIQ_STATE_T structure */ + u32 event; } REMOTE_EVENT_T; typedef struct opaque_platform_state_t *VCHIQ_PLATFORM_STATE_T; -- 2.20.1