diff options
Diffstat (limited to 'kernel/ethosu_capabilities.c')
| -rw-r--r-- | kernel/ethosu_capabilities.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/kernel/ethosu_capabilities.c b/kernel/ethosu_capabilities.c new file mode 100644 index 0000000..d5f77f2 --- /dev/null +++ b/kernel/ethosu_capabilities.c @@ -0,0 +1,173 @@ +/* + * Copyright (c) 2022 Arm Limited. + * + * This program is free software and is provided to you under the terms of the + * GNU General Public License version 2 as published by the Free Software + * Foundation, and any use by you of this program is subject to the terms + * of such GNU licence. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, you can access it online at + * http://www.gnu.org/licenses/gpl-2.0.html. + * + * SPDX-License-Identifier: GPL-2.0-only + */ + +/**************************************************************************** + * Includes + ****************************************************************************/ + +#include "ethosu_capabilities.h" + +#include "ethosu_device.h" + +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/errno.h> + +/**************************************************************************** + * Defines + ****************************************************************************/ + +#define CAPABILITIES_RESP_TIMEOUT_MS 2000 + +/**************************************************************************** + * Functions + ****************************************************************************/ + +static inline int ethosu_capabilities_send(struct ethosu_capabilities *cap) +{ + return ethosu_mailbox_capabilities_request(&cap->edev->mailbox, + &cap->msg); +} + +static void ethosu_capabilities_fail(struct ethosu_mailbox_msg *msg) +{ + struct ethosu_capabilities *cap = + container_of(msg, typeof(*cap), msg); + + if (completion_done(&cap->done)) + return; + + cap->errno = -EFAULT; + complete(&cap->done); +} + +static int ethosu_capabilities_resend(struct ethosu_mailbox_msg *msg) +{ + struct ethosu_capabilities *cap = + container_of(msg, typeof(*cap), msg); + + /* Don't resend request if response has already been received */ + if (completion_done(&cap->done)) + return 0; + + /* Resend request */ + return ethosu_capabilities_send(cap); +} + +void ethosu_capability_rsp(struct ethosu_device *edev, + struct ethosu_core_msg_capabilities_rsp *rsp) +{ + int id = (int)rsp->user_arg; + struct ethosu_mailbox_msg *msg; + struct ethosu_capabilities *cap; + + msg = ethosu_mailbox_find(&edev->mailbox, id); + if (IS_ERR(msg)) { + dev_warn(edev->dev, + "Id for capabilities msg not found. id=%d\n", + id); + + return; + } + + cap = container_of(msg, typeof(*cap), msg); + + if (completion_done(&cap->done)) + return; + + cap->uapi->hw_id.version_status = rsp->version_status; + cap->uapi->hw_id.version_minor = rsp->version_minor; + cap->uapi->hw_id.version_major = rsp->version_major; + cap->uapi->hw_id.product_major = rsp->product_major; + cap->uapi->hw_id.arch_patch_rev = rsp->arch_patch_rev; + cap->uapi->hw_id.arch_minor_rev = rsp->arch_minor_rev; + cap->uapi->hw_id.arch_major_rev = rsp->arch_major_rev; + cap->uapi->driver_patch_rev = rsp->driver_patch_rev; + cap->uapi->driver_minor_rev = rsp->driver_minor_rev; + cap->uapi->driver_major_rev = rsp->driver_major_rev; + cap->uapi->hw_cfg.macs_per_cc = rsp->macs_per_cc; + cap->uapi->hw_cfg.cmd_stream_version = rsp->cmd_stream_version; + cap->uapi->hw_cfg.custom_dma = rsp->custom_dma; + + cap->errno = 0; + complete(&cap->done); +} + +int ethosu_capabilities_request(struct ethosu_device *edev, + struct ethosu_uapi_device_capabilities *uapi) +{ + struct ethosu_capabilities *cap; + int ret; + int timeout; + + cap = devm_kzalloc(edev->dev, sizeof(struct ethosu_capabilities), + GFP_KERNEL); + if (!cap) + return -ENOMEM; + + cap->edev = edev; + cap->uapi = uapi; + init_completion(&cap->done); + cap->msg.fail = ethosu_capabilities_fail; + cap->msg.resend = ethosu_capabilities_resend; + + ret = ethosu_mailbox_register(&cap->edev->mailbox, &cap->msg); + if (ret < 0) + goto kfree; + + dev_info(edev->dev, "Capabilities create. Id=%d, handle=0x%p\n", + cap->msg.id, cap); + + ret = ethosu_capabilities_send(cap); + if (0 != ret) + goto deregister; + + /* Unlock the mutex before going to block on the condition */ + mutex_unlock(&edev->mutex); + + /* wait for response to arrive back */ + timeout = wait_for_completion_timeout(&cap->done, + msecs_to_jiffies( + CAPABILITIES_RESP_TIMEOUT_MS)); + + /* take back the mutex before resuming to do anything */ + mutex_lock(&edev->mutex); + + if (0 == timeout) { + dev_warn(edev->dev, "Capabilities response timeout"); + ret = -ETIME; + goto deregister; + } + + if (cap->errno) { + ret = cap->errno; + goto deregister; + } + +deregister: + ethosu_mailbox_deregister(&cap->edev->mailbox, &cap->msg); + +kfree: + dev_info(cap->edev->dev, "Capabilities destroy. Id=%d, handle=0x%p\n", + cap->msg.id, cap); + devm_kfree(cap->edev->dev, cap); + + return ret; +} |