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Commit b7a199ae authored by Laisheng Hu's avatar Laisheng Hu Committed by Gerrit - the friendly Code Review server
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msm: cvp: Add snapshot of fastcvpd driver 



Add fastcvp driver, which exposes APIs to video driver
to share HFI command queue address to CDSP and
handle errors to exit gracefully in case video and
cdsp subsystems restart.
This snapshot was taken as of msm-4.14 with commit
5704525974fc1f3cb3f14d922d4987f35f2dc278.

Change-Id: I2b75e01f88d4bc5a267942e63cab79094ef327b9
Signed-off-by: default avatarLaisheng Hu <laisheng@codeaurora.org>
parent 8e71903a

drivers/char/Kconfig

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Original line number Original line Diff line number Diff line
@@ -544,6 +544,15 @@ config TILE_SROM 




source "drivers/char/xillybus/Kconfig"

source "drivers/char/xillybus/Kconfig"





config MSM_FASTCVPD

	bool "QTI FASTCVP driver"

	depends on QCOM_GLINK

	help

		This driver exposes APIs to video driver to share

		HFI command queue address to CDSP and handle errors

		to exit gracefully in case video and cdsp subsystems crash.

		Say M if you want to enable this module.



config MSM_ADSPRPC

config MSM_ADSPRPC

	tristate "QTI FastRPC driver"

	tristate "QTI FastRPC driver"

	depends on RPMSG && QCOM_SECURE_BUFFER && MSM_SERVICE_LOCATOR && MSM_SERVICE_NOTIFIER && PM_SLEEP && HAS_DMA && CMA && MMU

	depends on RPMSG && QCOM_SECURE_BUFFER && MSM_SERVICE_LOCATOR && MSM_SERVICE_NOTIFIER && PM_SLEEP && HAS_DMA && CMA && MMU

drivers/char/Makefile

+1 −0
Original line number Original line Diff line number Diff line
@@ -61,3 +61,4 @@ endif 
obj-$(CONFIG_MSM_ADSPRPC)	+= frpc-adsprpc.o

obj-$(CONFIG_MSM_ADSPRPC)	+= frpc-adsprpc.o

obj-$(CONFIG_ADI)		+= adi.o

obj-$(CONFIG_ADI)		+= adi.o

obj-$(CONFIG_MSM_RDBG)		+= rdbg.o

obj-$(CONFIG_MSM_RDBG)		+= rdbg.o

obj-$(CONFIG_MSM_FASTCVPD)	+= fastcvpd.o

drivers/char/fastcvpd.c

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// SPDX-License-Identifier: GPL-2.0-only

/*

 * Copyright (c) 2018-2020, The Linux Foundation. All rights reserved.

 */



#include <linux/module.h>

#include <linux/rpmsg.h>

#include <linux/of_platform.h>

#include <soc/qcom/secure_buffer.h>

#include "linux/fastcvpd.h"



#define VMID_CDSP_Q6 (30)

#define SRC_VM_NUM 1

#define DEST_VM_NUM 2

#define FASTCVPD_VIDEO_SEND_HFI_CMD_QUEUE 0

#define FASTCVPD_VIDEO_SUSPEND 1

#define FASTCVPD_VIDEO_RESUME 2

#define FASTCVPD_VIDEO_SHUTDOWN 3

#define STATUS_INIT 0

#define STATUS_DEINIT 1

#define STATUS_OK 2

#define STATUS_SSR 3



struct fastcvpd_cmd_msg {

	uint32_t cmd_msg_type;

	int ret_val;

	uint64_t msg_ptr;

	uint32_t msg_ptr_len;

};



struct fastcvpd_cmd_msg_rsp {

	int ret_val;

};



struct fastcvpd_apps {

	struct rpmsg_device *chan;

	struct mutex smd_mutex;

	int rpmsg_register;

	uint32_t cdsp_state;

	uint32_t video_shutdown;

};



static struct completion work;



static struct fastcvpd_apps gfa_cv;



static struct fastcvpd_cmd_msg cmd_msg;



static struct fastcvpd_cmd_msg_rsp cmd_msg_rsp;



static int fastcvpd_send_cmd(void *msg, uint32_t len)

{

	struct fastcvpd_apps *me = &gfa_cv;

	int err;



	if (IS_ERR_OR_NULL(me->chan)) {

		err = -EINVAL;

		goto bail;

	}

	err = rpmsg_send(me->chan->ept, msg, len);



bail:

	return err;

}



static int fastcvpd_rpmsg_probe(struct rpmsg_device *rpdev)

{

	int err = 0;

	struct fastcvpd_apps *me = &gfa_cv;

	uint32_t cdsp_state, video_shutdown;

	uint64_t msg_ptr;

	uint32_t msg_ptr_len;

	int srcVM[DEST_VM_NUM] = {VMID_HLOS, VMID_CDSP_Q6};

	int destVM[SRC_VM_NUM] = {VMID_HLOS};

	int destVMperm[SRC_VM_NUM] = { PERM_READ | PERM_WRITE | PERM_EXEC };



	if (strcmp(rpdev->dev.parent->of_node->name, "cdsp")) {

		pr_err("%s: Failed to probe rpmsg device.Node name:%s\n",

			__func__, rpdev->dev.parent->of_node->name);

		err = -EINVAL;

		goto bail;

	}

	mutex_lock(&me->smd_mutex);

	me->chan = rpdev;

	cdsp_state = me->cdsp_state;

	video_shutdown = me->video_shutdown;

	msg_ptr = cmd_msg.msg_ptr;

	msg_ptr_len =  cmd_msg.msg_ptr_len;

	mutex_unlock(&me->smd_mutex);



	if (cdsp_state == STATUS_SSR && video_shutdown == STATUS_OK) {

		err = hyp_assign_phys((uint64_t)msg_ptr,

			msg_ptr_len, srcVM, DEST_VM_NUM, destVM,

			destVMperm, SRC_VM_NUM);

		if (err) {

			pr_err("%s: Failed to hyp_assign. err=%d\n",

				__func__, err);

			return err;

		}

		err = fastcvpd_video_send_cmd_hfi_queue(

			(phys_addr_t *)msg_ptr, msg_ptr_len);

		if (err) {

			pr_err("%s: Failed to send HFI Queue address. err=%d\n",

			__func__, err);

			goto bail;

		}

		mutex_lock(&me->smd_mutex);

		cdsp_state = me->cdsp_state;

		mutex_unlock(&me->smd_mutex);

	}



	pr_info("%s: Successfully probed. cdsp_state=%d video_shutdown=%d\n",

		__func__, cdsp_state, video_shutdown);

bail:

	return err;

}



static void fastcvpd_rpmsg_remove(struct rpmsg_device *rpdev)

{

	struct fastcvpd_apps *me = &gfa_cv;



	mutex_lock(&me->smd_mutex);

	me->chan = NULL;

	me->cdsp_state = STATUS_SSR;

	mutex_unlock(&me->smd_mutex);

	pr_info("%s: CDSP SSR triggered\n", __func__);

}



static int fastcvpd_rpmsg_callback(struct rpmsg_device *rpdev,

	void *data, int len, void *priv, u32 addr)

{

	int *rpmsg_resp = (int *)data;



	cmd_msg_rsp.ret_val = *rpmsg_resp;

	complete(&work);



	return 0;

}



int fastcvpd_video_send_cmd_hfi_queue(phys_addr_t *phys_addr,

	uint32_t size_in_bytes)

{

	int err;

	struct fastcvpd_cmd_msg local_cmd_msg;

	struct fastcvpd_apps *me = &gfa_cv;

	int srcVM[SRC_VM_NUM] = {VMID_HLOS};

	int destVM[DEST_VM_NUM] = {VMID_HLOS, VMID_CDSP_Q6};

	int destVMperm[DEST_VM_NUM] = { PERM_READ | PERM_WRITE | PERM_EXEC,

		PERM_READ | PERM_WRITE | PERM_EXEC };



	local_cmd_msg.cmd_msg_type = FASTCVPD_VIDEO_SEND_HFI_CMD_QUEUE;

	local_cmd_msg.msg_ptr = (uint64_t)phys_addr;

	local_cmd_msg.msg_ptr_len = size_in_bytes;

	mutex_lock(&me->smd_mutex);

	cmd_msg.msg_ptr = (uint64_t)phys_addr;

	cmd_msg.msg_ptr_len = (size_in_bytes);

	mutex_unlock(&me->smd_mutex);



	pr_debug("%s :: address of buffer, PA=0x%pK  size_buff=%d\n",

		__func__, phys_addr, size_in_bytes);



	err = hyp_assign_phys((uint64_t)local_cmd_msg.msg_ptr,

		local_cmd_msg.msg_ptr_len, srcVM, SRC_VM_NUM, destVM,

		destVMperm, DEST_VM_NUM);

	if (err) {

		pr_err("%s: Failed in hyp_assign. err=%d\n",

			__func__, err);

		return err;

	}



	err = fastcvpd_send_cmd

			 (&local_cmd_msg, sizeof(struct fastcvpd_cmd_msg));

	if (err != 0)

		pr_err("%s: fastcvpd_send_cmd failed with err=%d\n",

			__func__, err);

	else {

		mutex_lock(&me->smd_mutex);

		me->video_shutdown = STATUS_OK;

		me->cdsp_state = STATUS_OK;

		mutex_unlock(&me->smd_mutex);

	}



	return err;

}

EXPORT_SYMBOL(fastcvpd_video_send_cmd_hfi_queue);



int fastcvpd_video_suspend(uint32_t session_flag)

{

	int err = 0;

	struct fastcvpd_cmd_msg local_cmd_msg;

	struct fastcvpd_apps *me = &gfa_cv;

	uint32_t cdsp_state;



	mutex_lock(&me->smd_mutex);

	cdsp_state = me->cdsp_state;

	mutex_unlock(&me->smd_mutex);



	if (cdsp_state == STATUS_SSR)

		return 0;



	local_cmd_msg.cmd_msg_type = FASTCVPD_VIDEO_SUSPEND;

	err = fastcvpd_send_cmd

			 (&local_cmd_msg, sizeof(struct fastcvpd_cmd_msg));

	if (err != 0)

		pr_err("%s: fastcvpd_send_cmd failed with err=%d\n",

			__func__, err);



	return err;

}

EXPORT_SYMBOL(fastcvpd_video_suspend);



int fastcvpd_video_resume(uint32_t session_flag)

{

	int err;

	struct fastcvpd_cmd_msg local_cmd_msg;

	struct fastcvpd_apps *me = &gfa_cv;

	uint32_t cdsp_state;



	mutex_lock(&me->smd_mutex);

	cdsp_state = me->cdsp_state;

	mutex_unlock(&me->smd_mutex);



	if (cdsp_state == STATUS_SSR)

		return 0;



	local_cmd_msg.cmd_msg_type = FASTCVPD_VIDEO_RESUME;

	err = fastcvpd_send_cmd

			 (&local_cmd_msg, sizeof(struct fastcvpd_cmd_msg));

	if (err != 0)

		pr_err("%s: fastcvpd_send_cmd failed with err=%d\n",

			__func__, err);



	return err;

}

EXPORT_SYMBOL(fastcvpd_video_resume);



int fastcvpd_video_shutdown(uint32_t session_flag)

{

	struct fastcvpd_apps *me = &gfa_cv;

	int err, local_cmd_msg_rsp;

	struct fastcvpd_cmd_msg local_cmd_msg;

	int srcVM[DEST_VM_NUM] = {VMID_HLOS, VMID_CDSP_Q6};

	int destVM[SRC_VM_NUM] = {VMID_HLOS};

	int destVMperm[SRC_VM_NUM] = { PERM_READ | PERM_WRITE | PERM_EXEC };



	local_cmd_msg.cmd_msg_type = FASTCVPD_VIDEO_SHUTDOWN;

	err = fastcvpd_send_cmd

			 (&local_cmd_msg, sizeof(struct fastcvpd_cmd_msg));

	if (err != 0)

		pr_err("%s: fastcvpd_send_cmd failed with err=%d\n",

			__func__, err);



	wait_for_completion(&work);



	mutex_lock(&me->smd_mutex);

	me->video_shutdown = STATUS_SSR;

	local_cmd_msg.msg_ptr = cmd_msg.msg_ptr;

	local_cmd_msg.msg_ptr_len = cmd_msg.msg_ptr_len;

	mutex_unlock(&me->smd_mutex);

	local_cmd_msg_rsp = cmd_msg_rsp.ret_val;

	if (local_cmd_msg_rsp == 0) {

		err = hyp_assign_phys((uint64_t)local_cmd_msg.msg_ptr,

			local_cmd_msg.msg_ptr_len, srcVM, DEST_VM_NUM, destVM,

			destVMperm, SRC_VM_NUM);

		if (err) {

			pr_err("%s: Failed to hyp_assign. err=%d\n",

				__func__, err);

			return err;

		}

	} else {

		pr_err("%s: Skipping hyp_assign as CDSP sent invalid response=%d\n",

			__func__, local_cmd_msg_rsp);

	}



	return err;

}

EXPORT_SYMBOL(fastcvpd_video_shutdown);



static const struct rpmsg_device_id fastcvpd_rpmsg_match[] = {

	{ FASTCVPD_GLINK_GUID },

	{ },

};



static struct rpmsg_driver fastcvpd_rpmsg_client = {

	.id_table = fastcvpd_rpmsg_match,

	.probe = fastcvpd_rpmsg_probe,

	.remove = fastcvpd_rpmsg_remove,

	.callback = fastcvpd_rpmsg_callback,

	.drv = {

		.name = "qcom,msm_fastcvpd_rpmsg",

	},

};



static int __init fastcvpd_device_init(void)

{

	struct fastcvpd_apps *me = &gfa_cv;

	int err;



	init_completion(&work);

	mutex_init(&me->smd_mutex);

	me->video_shutdown = STATUS_INIT;

	me->cdsp_state = STATUS_INIT;

	err = register_rpmsg_driver(&fastcvpd_rpmsg_client);

	if (err) {

		pr_err("%s : register_rpmsg_driver failed with err %d\n",

			__func__, err);

		goto register_bail;

	}

	me->rpmsg_register = 1;

	return 0;



register_bail:

	me->video_shutdown = STATUS_DEINIT;

	me->cdsp_state = STATUS_DEINIT;

	return err;

}



static void __exit fastcvpd_device_exit(void)

{

	struct fastcvpd_apps *me = &gfa_cv;



	me->video_shutdown = STATUS_DEINIT;

	me->cdsp_state = STATUS_DEINIT;

	mutex_destroy(&me->smd_mutex);

	if (me->rpmsg_register == 1)

		unregister_rpmsg_driver(&fastcvpd_rpmsg_client);

}



late_initcall(fastcvpd_device_init);

module_exit(fastcvpd_device_exit);



MODULE_LICENSE("GPL v2");

include/linux/fastcvpd.h

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/* SPDX-License-Identifier: GPL-2.0-only */

/*

 * Copyright (c) 2018-2020, The Linux Foundation. All rights reserved.

 */



#ifndef FASTCVPD_H

#define FASTCVPD_H



#include <linux/types.h>



#define FASTCVPD_GLINK_GUID "fastcvpd-glink-apps-dsp"

#define FASTCVPD_SMD_GUID "fastcvpd-smd-apps-dsp"

#define FASTCVPD_DEVICE_NAME "fastcvpd-smd"



#ifdef CONFIG_MSM_FASTCVPD

/*

 * API for Video driver to send physical address to FastCVP driver

 * @param phys_addr

 * Physical address of command message queue

 * that needs to be mapped to CDSP.

 * It should be allocated from CMA adsp_mem region.

 *

 * @param size_in_bytes

 * Size in bytes of command message queue

 */

int fastcvpd_video_send_cmd_hfi_queue(phys_addr_t *phys_addr,

	uint32_t size_in_bytes);



/*

 * API for Video driver to suspend CVP session during

 * power collapse

 *

 * @param session_flag

 * Flag to share details of session.

 */

int fastcvpd_video_suspend(uint32_t session_flag);



/*

 * API for Video driver to resume CVP session during

 * power collapse

 *

 * @param session_flag

 * Flag to share details of session.

 */

int fastcvpd_video_resume(uint32_t session_flag);



/*

 * API for Video driver to shutdown CVP session during

 * video subsystem error.

 *

 * @param session_flag

 * Flag to share details of session.

 */

int fastcvpd_video_shutdown(uint32_t session_flag);



#else



static inline int fastcvpd_video_send_cmd_hfi_queue(

	phys_addr_t *phys_addr,

	uint32_t size_in_bytes)

{

	return -ENODEV;

}



static inline int fastcvpd_video_shutdown(uint32_t session_flag)

{

	return -ENODEV;

}



static inline int fastcvpd_video_suspend(uint32_t session_flag)

{

	return -ENODEV;

}



static inline int fastcvpd_video_resume(uint32_t session_flag)

{

	return -ENODEV;

}



#endif // CONFIG_FASTCVPD

#endif // FASTCVPD_H