| /* |
| * SPDX-FileCopyrightText: Copyright 2019-2023 Arm Limited and/or its affiliates <open-source-office@arm.com> |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| * |
| * Licensed under the Apache License, Version 2.0 (the License); you may |
| * not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an AS IS BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /****************************************************************************** |
| * Includes |
| ******************************************************************************/ |
| |
| #include "ethosu_driver.h" |
| #include "ethosu_device.h" |
| #include "ethosu_log.h" |
| |
| #ifdef ETHOSU55 |
| #include "ethosu_config_u55.h" |
| #else |
| #include "ethosu_config_u65.h" |
| #endif |
| |
| #include <assert.h> |
| #include <cmsis_compiler.h> |
| #include <inttypes.h> |
| #include <stdbool.h> |
| #include <stddef.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| |
| /****************************************************************************** |
| * Defines |
| ******************************************************************************/ |
| |
| #define UNUSED(x) ((void)x) |
| |
| #define BYTES_IN_32_BITS 4 |
| #define MASK_16_BYTE_ALIGN (0xF) |
| #define OPTIMIZER_CONFIG_LENGTH_32_BIT_WORD 2 |
| #define DRIVER_ACTION_LENGTH_32_BIT_WORD 1 |
| #define ETHOSU_FOURCC ('1' << 24 | 'P' << 16 | 'O' << 8 | 'C') // "Custom Operator Payload 1" |
| |
| #define FAST_MEMORY_BASE_ADDR_INDEX 2 |
| |
| /****************************************************************************** |
| * Types |
| ******************************************************************************/ |
| |
| // Driver actions |
| enum DRIVER_ACTION_e |
| { |
| RESERVED = 0, |
| OPTIMIZER_CONFIG = 1, |
| COMMAND_STREAM = 2, |
| NOP = 5, |
| }; |
| |
| // Custom operator payload data struct |
| struct cop_data_s |
| { |
| union |
| { |
| // Driver action data |
| struct |
| { |
| uint8_t driver_action_command; // (valid values in DRIVER_ACTION_e) |
| uint8_t reserved; |
| |
| // Driver action data |
| union |
| { |
| // DA_CMD_OPT_CFG |
| struct |
| { |
| uint16_t rel_nbr : 4; |
| uint16_t patch_nbr : 4; |
| uint16_t opt_cfg_reserved : 8; |
| }; |
| |
| // DA_CMD_CMSTRM |
| struct |
| { |
| uint16_t length; |
| }; |
| |
| uint16_t driver_action_data; |
| }; |
| }; |
| |
| uint32_t word; |
| }; |
| }; |
| |
| // optimizer config struct |
| struct opt_cfg_s |
| { |
| struct cop_data_s da_data; |
| uint32_t cfg; |
| uint32_t id; |
| }; |
| |
| /****************************************************************************** |
| * Variables |
| ******************************************************************************/ |
| |
| // Registered drivers linked list HEAD |
| static struct ethosu_driver *registered_drivers = NULL; |
| |
| /****************************************************************************** |
| * Weak functions - Cache |
| * |
| * Default NOP operations. Override if available on the targeted device. |
| ******************************************************************************/ |
| |
| /* |
| * Flush/clean the data cache by address and size. Passing NULL as p argument |
| * expects the whole cache to be flushed. |
| */ |
| void __attribute__((weak)) ethosu_flush_dcache(uint32_t *p, size_t bytes) |
| { |
| UNUSED(p); |
| UNUSED(bytes); |
| } |
| |
| /* |
| * Invalidate the data cache by address and size. Passing NULL as p argument |
| * expects the whole cache to be invalidated. |
| */ |
| void __attribute__((weak)) ethosu_invalidate_dcache(uint32_t *p, size_t bytes) |
| { |
| UNUSED(p); |
| UNUSED(bytes); |
| } |
| |
| /****************************************************************************** |
| * Weak functions - Semaphore/Mutex for multi NPU |
| * |
| * Following section handles the minimal sempahore and mutex implementation in |
| * case of baremetal applications. Weak symbols will be overridden by RTOS |
| * definitions and implement true thread-safety (in application layer). |
| ******************************************************************************/ |
| |
| struct ethosu_semaphore_t |
| { |
| uint8_t count; |
| }; |
| |
| static void *ethosu_mutex; |
| static void *ethosu_semaphore; |
| |
| void *__attribute__((weak)) ethosu_mutex_create(void) |
| { |
| return NULL; |
| } |
| |
| void __attribute__((weak)) ethosu_mutex_destroy(void *mutex) |
| { |
| UNUSED(mutex); |
| } |
| |
| int __attribute__((weak)) ethosu_mutex_lock(void *mutex) |
| { |
| UNUSED(mutex); |
| return 0; |
| } |
| |
| int __attribute__((weak)) ethosu_mutex_unlock(void *mutex) |
| { |
| UNUSED(mutex); |
| return 0; |
| } |
| |
| // Baremetal implementation of creating a semaphore |
| void *__attribute__((weak)) ethosu_semaphore_create(void) |
| { |
| struct ethosu_semaphore_t *sem = malloc(sizeof(*sem)); |
| if (sem != NULL) |
| { |
| sem->count = 0; |
| } |
| return sem; |
| } |
| |
| void __attribute__((weak)) ethosu_semaphore_destroy(void *sem) |
| { |
| free((struct ethosu_semaphore_t *)sem); |
| } |
| |
| // Baremetal simulation of waiting/sleeping for and then taking a semaphore using intrisics |
| int __attribute__((weak)) ethosu_semaphore_take(void *sem) |
| { |
| struct ethosu_semaphore_t *s = sem; |
| while (s->count == 0) |
| { |
| __WFE(); |
| } |
| s->count--; |
| return 0; |
| } |
| |
| // Baremetal simulation of giving a semaphore and waking up processes using intrinsics |
| int __attribute__((weak)) ethosu_semaphore_give(void *sem) |
| { |
| struct ethosu_semaphore_t *s = sem; |
| s->count++; |
| __SEV(); |
| return 0; |
| } |
| |
| /****************************************************************************** |
| * Weak functions - Inference begin/end callbacks |
| ******************************************************************************/ |
| |
| void __attribute__((weak)) ethosu_inference_begin(struct ethosu_driver *drv, void *user_arg) |
| { |
| UNUSED(user_arg); |
| UNUSED(drv); |
| } |
| |
| void __attribute__((weak)) ethosu_inference_end(struct ethosu_driver *drv, void *user_arg) |
| { |
| UNUSED(user_arg); |
| UNUSED(drv); |
| } |
| |
| /****************************************************************************** |
| * Static functions |
| ******************************************************************************/ |
| static void ethosu_register_driver(struct ethosu_driver *drv) |
| { |
| ethosu_mutex_lock(ethosu_mutex); |
| drv->next = registered_drivers; |
| registered_drivers = drv; |
| ethosu_mutex_unlock(ethosu_mutex); |
| |
| ethosu_semaphore_give(ethosu_semaphore); |
| |
| LOG_INFO("New NPU driver registered (handle: 0x%p, NPU: 0x%p)", drv, drv->dev->reg); |
| } |
| |
| static int ethosu_deregister_driver(struct ethosu_driver *drv) |
| { |
| struct ethosu_driver *curr; |
| struct ethosu_driver **prev; |
| |
| ethosu_mutex_lock(ethosu_mutex); |
| curr = registered_drivers; |
| prev = ®istered_drivers; |
| |
| while (curr != NULL) |
| { |
| if (curr == drv) |
| { |
| *prev = curr->next; |
| LOG_INFO("NPU driver handle %p deregistered.", drv); |
| ethosu_semaphore_take(ethosu_semaphore); |
| break; |
| } |
| |
| prev = &curr->next; |
| curr = curr->next; |
| } |
| |
| ethosu_mutex_unlock(ethosu_mutex); |
| |
| if (curr == NULL) |
| { |
| LOG_ERR("No NPU driver handle registered at address %p.", drv); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| static void ethosu_reset_job(struct ethosu_driver *drv) |
| { |
| memset(&drv->job, 0, sizeof(struct ethosu_job)); |
| } |
| |
| static int handle_optimizer_config(struct ethosu_driver *drv, struct opt_cfg_s const *opt_cfg_p) |
| { |
| LOG_INFO("Optimizer release nbr: %u patch: %u", opt_cfg_p->da_data.rel_nbr, opt_cfg_p->da_data.patch_nbr); |
| |
| if (ethosu_dev_verify_optimizer_config(drv->dev, opt_cfg_p->cfg, opt_cfg_p->id) != true) |
| { |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| static int handle_command_stream(struct ethosu_driver *drv, const uint8_t *cmd_stream, const int cms_length) |
| { |
| uint32_t cms_bytes = cms_length * BYTES_IN_32_BITS; |
| ptrdiff_t cmd_stream_ptr = (ptrdiff_t)cmd_stream; |
| |
| LOG_INFO("handle_command_stream: cmd_stream=%p, cms_length %d", cmd_stream, cms_length); |
| |
| if (0 != ((ptrdiff_t)cmd_stream & MASK_16_BYTE_ALIGN)) |
| { |
| LOG_ERR("Command stream addr %p not aligned to 16 bytes", cmd_stream); |
| return -1; |
| } |
| |
| // Verify 16 byte alignment for base address' |
| for (int i = 0; i < drv->job.num_base_addr; i++) |
| { |
| if (0 != (drv->job.base_addr[i] & MASK_16_BYTE_ALIGN)) |
| { |
| LOG_ERR("Base addr %d: 0x%llx not aligned to 16 bytes", i, drv->job.base_addr[i]); |
| return -1; |
| } |
| } |
| |
| // Flush the cache if available on CPU. |
| // The upcasting to uin32_t* is ok since the pointer never is dereferenced. |
| // The base_addr_size is null if invoking from prior to invoke_V2, in that case |
| // the whole cache is being flushed. |
| |
| if (drv->job.base_addr_size != NULL) |
| { |
| ethosu_flush_dcache((uint32_t *)cmd_stream_ptr, cms_bytes); |
| for (int i = 0; i < drv->job.num_base_addr; i++) |
| { |
| ethosu_flush_dcache((uint32_t *)(uintptr_t)drv->job.base_addr[i], drv->job.base_addr_size[i]); |
| } |
| } |
| else |
| { |
| ethosu_flush_dcache(NULL, 0); |
| } |
| |
| // Request power gating disabled during inference run |
| if (ethosu_request_power(drv)) |
| { |
| LOG_ERR("Failed to request power"); |
| return -1; |
| } |
| |
| drv->job.state = ETHOSU_JOB_RUNNING; |
| |
| // Inference begin callback |
| ethosu_inference_begin(drv, drv->job.user_arg); |
| |
| // Execute the command stream |
| ethosu_dev_run_command_stream(drv->dev, cmd_stream, cms_bytes, drv->job.base_addr, drv->job.num_base_addr); |
| |
| return 0; |
| } |
| |
| /****************************************************************************** |
| * Weak functions - Interrupt handler |
| ******************************************************************************/ |
| void __attribute__((weak)) ethosu_irq_handler(struct ethosu_driver *drv) |
| { |
| LOG_DEBUG("Got interrupt from Ethos-U"); |
| |
| drv->job.state = ETHOSU_JOB_DONE; |
| if (!ethosu_dev_handle_interrupt(drv->dev)) |
| { |
| drv->status_error = true; |
| } |
| ethosu_semaphore_give(drv->semaphore); |
| } |
| |
| /****************************************************************************** |
| * Functions API |
| ******************************************************************************/ |
| |
| int ethosu_init(struct ethosu_driver *drv, |
| void *const base_address, |
| const void *fast_memory, |
| const size_t fast_memory_size, |
| uint32_t secure_enable, |
| uint32_t privilege_enable) |
| { |
| LOG_INFO("Initializing NPU: base_address=%p, fast_memory=%p, fast_memory_size=%zu, secure=%" PRIu32 |
| ", privileged=%" PRIu32, |
| base_address, |
| fast_memory, |
| fast_memory_size, |
| secure_enable, |
| privilege_enable); |
| |
| if (!ethosu_mutex) |
| { |
| ethosu_mutex = ethosu_mutex_create(); |
| } |
| |
| if (!ethosu_semaphore) |
| { |
| ethosu_semaphore = ethosu_semaphore_create(); |
| if (!ethosu_semaphore) |
| { |
| LOG_ERR("Failed to create global driver semaphore"); |
| return -1; |
| } |
| } |
| |
| drv->fast_memory = (uint32_t)fast_memory; |
| drv->fast_memory_size = fast_memory_size; |
| drv->power_request_counter = 0; |
| |
| // Initialize the device and set requested security state and privilege mode |
| drv->dev = ethosu_dev_init(base_address, secure_enable, privilege_enable); |
| |
| if (drv->dev == NULL) |
| { |
| LOG_ERR("Failed to initialize Ethos-U device"); |
| return -1; |
| } |
| |
| drv->semaphore = ethosu_semaphore_create(); |
| if (!drv->semaphore) |
| { |
| LOG_ERR("Failed to create driver semaphore"); |
| ethosu_dev_deinit(drv->dev); |
| drv->dev = NULL; |
| return -1; |
| } |
| |
| drv->status_error = false; |
| |
| ethosu_reset_job(drv); |
| ethosu_register_driver(drv); |
| |
| return 0; |
| } |
| |
| void ethosu_deinit(struct ethosu_driver *drv) |
| { |
| ethosu_deregister_driver(drv); |
| ethosu_semaphore_destroy(drv->semaphore); |
| ethosu_dev_deinit(drv->dev); |
| drv->dev = NULL; |
| } |
| |
| int ethosu_soft_reset(struct ethosu_driver *drv) |
| { |
| // Soft reset the NPU |
| if (ethosu_dev_soft_reset(drv->dev) != ETHOSU_SUCCESS) |
| { |
| LOG_ERR("Failed to soft-reset NPU"); |
| return -1; |
| } |
| |
| // Update power and clock gating after the soft reset |
| ethosu_dev_set_clock_and_power(drv->dev, |
| drv->power_request_counter > 0 ? ETHOSU_CLOCK_Q_DISABLE : ETHOSU_CLOCK_Q_ENABLE, |
| drv->power_request_counter > 0 ? ETHOSU_POWER_Q_DISABLE : ETHOSU_POWER_Q_ENABLE); |
| |
| return 0; |
| } |
| |
| int ethosu_request_power(struct ethosu_driver *drv) |
| { |
| // Check if this is the first power request, increase counter |
| if (drv->power_request_counter++ == 0) |
| { |
| // Always reset to a known state. Changes to requested |
| // security state/privilege mode if necessary. |
| if (ethosu_soft_reset(drv)) |
| { |
| LOG_ERR("Failed to request power for Ethos-U"); |
| drv->power_request_counter--; |
| return -1; |
| } |
| } |
| return 0; |
| } |
| |
| void ethosu_release_power(struct ethosu_driver *drv) |
| { |
| if (drv->power_request_counter == 0) |
| { |
| LOG_WARN("No power request left to release, reference counter is 0"); |
| } |
| else |
| { |
| // Decrement ref counter and enable power gating if no requests remain |
| if (--drv->power_request_counter == 0) |
| { |
| ethosu_dev_set_clock_and_power(drv->dev, ETHOSU_CLOCK_Q_ENABLE, ETHOSU_POWER_Q_ENABLE); |
| } |
| } |
| } |
| |
| void ethosu_get_driver_version(struct ethosu_driver_version *ver) |
| { |
| assert(ver != NULL); |
| ver->major = ETHOSU_DRIVER_VERSION_MAJOR; |
| ver->minor = ETHOSU_DRIVER_VERSION_MINOR; |
| ver->patch = ETHOSU_DRIVER_VERSION_PATCH; |
| } |
| |
| void ethosu_get_hw_info(struct ethosu_driver *drv, struct ethosu_hw_info *hw) |
| { |
| assert(hw != NULL); |
| ethosu_dev_get_hw_info(drv->dev, hw); |
| } |
| |
| int ethosu_wait(struct ethosu_driver *drv, bool block) |
| { |
| int ret = 0; |
| |
| switch (drv->job.state) |
| { |
| case ETHOSU_JOB_IDLE: |
| LOG_ERR("Inference job not running..."); |
| ret = -2; |
| break; |
| case ETHOSU_JOB_RUNNING: |
| if (!block) |
| { |
| // Inference still running, do not block |
| ret = 1; |
| break; |
| } |
| // fall through |
| case ETHOSU_JOB_DONE: |
| // Wait for interrupt in blocking mode. In non-blocking mode |
| // the interrupt has already triggered |
| ethosu_semaphore_take(drv->semaphore); |
| |
| // Inference done callback |
| ethosu_inference_end(drv, drv->job.user_arg); |
| |
| // Relase power gating disabled requirement |
| ethosu_release_power(drv); |
| |
| // Check NPU and interrupt status |
| if (drv->status_error) |
| { |
| LOG_ERR("NPU error(s) occured during inference."); |
| ethosu_dev_print_err_status(drv->dev); |
| |
| // Reset the NPU |
| (void)ethosu_soft_reset(drv); |
| // NPU is no longer in error state |
| drv->status_error = false; |
| |
| ret = -1; |
| } |
| |
| if (ret == 0) |
| { |
| // Invalidate cache |
| if (drv->job.base_addr_size != NULL) |
| { |
| for (int i = 0; i < drv->job.num_base_addr; i++) |
| { |
| ethosu_invalidate_dcache((uint32_t *)(uintptr_t)drv->job.base_addr[i], drv->job.base_addr_size[i]); |
| } |
| } |
| else |
| { |
| ethosu_invalidate_dcache(NULL, 0); |
| } |
| |
| LOG_DEBUG("Inference finished successfully..."); |
| } |
| |
| // Reset internal job (state resets to IDLE) |
| ethosu_reset_job(drv); |
| break; |
| |
| default: |
| LOG_ERR("Unexpected job state"); |
| ethosu_reset_job(drv); |
| ret = -1; |
| break; |
| } |
| |
| // Return inference job status |
| return ret; |
| } |
| |
| int ethosu_invoke_async(struct ethosu_driver *drv, |
| const void *custom_data_ptr, |
| const int custom_data_size, |
| uint64_t *const base_addr, |
| const size_t *base_addr_size, |
| const int num_base_addr, |
| void *user_arg) |
| { |
| |
| const struct cop_data_s *data_ptr = custom_data_ptr; |
| const struct cop_data_s *data_end = (struct cop_data_s *)((ptrdiff_t)custom_data_ptr + custom_data_size); |
| |
| // Make sure an inference is not already running |
| if (drv->job.state != ETHOSU_JOB_IDLE) |
| { |
| LOG_ERR("Inference already running, or waiting to be cleared..."); |
| return -1; |
| } |
| |
| drv->job.state = ETHOSU_JOB_IDLE; |
| drv->job.custom_data_ptr = custom_data_ptr; |
| drv->job.custom_data_size = custom_data_size; |
| drv->job.base_addr = base_addr; |
| drv->job.base_addr_size = base_addr_size; |
| drv->job.num_base_addr = num_base_addr; |
| drv->job.user_arg = user_arg; |
| |
| // First word in custom_data_ptr should contain "Custom Operator Payload 1" |
| if (data_ptr->word != ETHOSU_FOURCC) |
| { |
| LOG_ERR("Custom Operator Payload: %" PRIu32 " is not correct, expected %x", data_ptr->word, ETHOSU_FOURCC); |
| goto err; |
| } |
| |
| // Custom data length must be a multiple of 32 bits |
| if ((custom_data_size % BYTES_IN_32_BITS) != 0) |
| { |
| LOG_ERR("custom_data_size=0x%x not a multiple of 4", (unsigned)custom_data_size); |
| goto err; |
| } |
| |
| data_ptr++; |
| |
| // Adjust base address to fast memory area |
| if (drv->fast_memory != 0 && num_base_addr >= FAST_MEMORY_BASE_ADDR_INDEX) |
| { |
| |
| if (base_addr_size != NULL && base_addr_size[FAST_MEMORY_BASE_ADDR_INDEX] > drv->fast_memory_size) |
| { |
| LOG_ERR("Fast memory area too small. fast_memory_size=%u, base_addr_size=%u", |
| drv->fast_memory_size, |
| base_addr_size[FAST_MEMORY_BASE_ADDR_INDEX]); |
| goto err; |
| } |
| |
| base_addr[FAST_MEMORY_BASE_ADDR_INDEX] = drv->fast_memory; |
| } |
| |
| drv->status_error = false; |
| |
| // Parse Custom Operator Payload data |
| while (data_ptr < data_end) |
| { |
| switch (data_ptr->driver_action_command) |
| { |
| case OPTIMIZER_CONFIG: |
| LOG_DEBUG("OPTIMIZER_CONFIG"); |
| struct opt_cfg_s const *opt_cfg_p = (const struct opt_cfg_s *)data_ptr; |
| |
| if (handle_optimizer_config(drv, opt_cfg_p) < 0) |
| { |
| goto err; |
| } |
| data_ptr += DRIVER_ACTION_LENGTH_32_BIT_WORD + OPTIMIZER_CONFIG_LENGTH_32_BIT_WORD; |
| break; |
| case COMMAND_STREAM: |
| // Vela only supports putting one COMMAND_STREAM per op |
| LOG_DEBUG("COMMAND_STREAM"); |
| const uint8_t *command_stream = (const uint8_t *)(data_ptr + 1); |
| int cms_length = (data_ptr->reserved << 16) | data_ptr->length; |
| |
| if (handle_command_stream(drv, command_stream, cms_length) < 0) |
| { |
| goto err; |
| } |
| data_ptr += DRIVER_ACTION_LENGTH_32_BIT_WORD + cms_length; |
| break; |
| case NOP: |
| LOG_DEBUG("NOP"); |
| data_ptr += DRIVER_ACTION_LENGTH_32_BIT_WORD; |
| break; |
| default: |
| LOG_ERR("UNSUPPORTED driver_action_command: %u", data_ptr->driver_action_command); |
| goto err; |
| break; |
| } |
| } |
| |
| return 0; |
| err: |
| LOG_ERR("Failed to invoke inference."); |
| ethosu_reset_job(drv); |
| return -1; |
| } |
| |
| int ethosu_invoke_v3(struct ethosu_driver *drv, |
| const void *custom_data_ptr, |
| const int custom_data_size, |
| uint64_t *const base_addr, |
| const size_t *base_addr_size, |
| const int num_base_addr, |
| void *user_arg) |
| { |
| if (ethosu_invoke_async( |
| drv, custom_data_ptr, custom_data_size, base_addr, base_addr_size, num_base_addr, user_arg) < 0) |
| { |
| return -1; |
| } |
| |
| return ethosu_wait(drv, true); |
| } |
| |
| struct ethosu_driver *ethosu_reserve_driver(void) |
| { |
| struct ethosu_driver *drv = NULL; |
| |
| LOG_INFO("Acquiring NPU driver handle"); |
| ethosu_semaphore_take(ethosu_semaphore); // This is meant to block until available |
| |
| ethosu_mutex_lock(ethosu_mutex); |
| drv = registered_drivers; |
| |
| while (drv != NULL) |
| { |
| if (!drv->reserved) |
| { |
| drv->reserved = true; |
| LOG_DEBUG("NPU driver handle %p reserved", drv); |
| break; |
| } |
| drv = drv->next; |
| } |
| ethosu_mutex_unlock(ethosu_mutex); |
| |
| if (!drv) |
| { |
| LOG_ERR("No NPU driver handle available, but semaphore taken"); |
| } |
| |
| return drv; |
| } |
| |
| void ethosu_release_driver(struct ethosu_driver *drv) |
| { |
| ethosu_mutex_lock(ethosu_mutex); |
| if (drv != NULL && drv->reserved) |
| { |
| if (drv->job.state == ETHOSU_JOB_RUNNING || drv->job.state == ETHOSU_JOB_DONE) |
| { |
| // Give the inference one shot to complete or force kill the job |
| if (ethosu_wait(drv, false) == 1) |
| { |
| // Still running, soft reset the NPU and reset driver |
| drv->power_request_counter = 0; |
| ethosu_soft_reset(drv); |
| ethosu_reset_job(drv); |
| drv->status_error = false; |
| } |
| } |
| |
| drv->reserved = false; |
| LOG_DEBUG("NPU driver handle %p released", drv); |
| ethosu_semaphore_give(ethosu_semaphore); |
| } |
| ethosu_mutex_unlock(ethosu_mutex); |
| } |