media: iris: implement iris v4l2 file ops

Implement open, close and poll ops.

Open:
Configure the vb2 queue and v4l2 file handler. Allocate a video instance
and add the instance to core instance list.

Close:
Free the instance and remove it from core instance list.

Poll:
Wait for an event on vb2 src and vb2 dst queues.

Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Hans Verkuil <hverkuil@xs4all.nl>
Tested-by: Stefan Schmidt <stefan.schmidt@linaro.org> # x1e80100 (Dell XPS 13 9345)
Reviewed-by: Stefan Schmidt <stefan.schmidt@linaro.org>
Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8550-QRD
Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8550-HDK
Signed-off-by: Dikshita Agarwal <quic_dikshita@quicinc.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>

drivers/media/platform/qcom/iris/Kconfig

@@ -2,6 +2,7 @@ config VIDEO_QCOM_IRIS
         tristate "Qualcomm iris V4L2 decoder driver"
         depends on VIDEO_DEV
         depends on ARCH_QCOM || COMPILE_TEST
+        select V4L2_MEM2MEM_DEV
         help
           This is a V4L2 driver for Qualcomm iris video accelerator
           hardware. It accelerates decoding operations on various

drivers/media/platform/qcom/iris/Makefile

@@ -1,4 +1,7 @@
-iris-objs += iris_platform_sm8550.o \
+iris-objs += iris_hfi_gen1_command.o \
+             iris_hfi_gen2_command.o \
+             iris_platform_sm8550.o \
              iris_probe.o \
+             iris_vidc.o \
 
 obj-$(CONFIG_VIDEO_QCOM_IRIS) += iris.o

drivers/media/platform/qcom/iris/iris_core.h

@@ -25,6 +25,7 @@ struct icc_info {
  * @irq: iris irq
  * @v4l2_dev: a holder for v4l2 device structure
  * @vdev_dec: iris video device structure for decoder
+ * @iris_v4l2_file_ops: iris v4l2 file ops
  * @icc_tbl: table of iris interconnects
  * @icc_count: count of iris interconnects
  * @pmdomain_tbl: table of iris power domains
@@ -41,6 +42,7 @@ struct iris_core {
 	int					irq;
 	struct v4l2_device			v4l2_dev;
 	struct video_device			*vdev_dec;
+	const struct v4l2_file_operations	*iris_v4l2_file_ops;
 	struct icc_bulk_data			*icc_tbl;
 	u32					icc_count;
 	struct dev_pm_domain_list		*pmdomain_tbl;

drivers/media/platform/qcom/iris/iris_hfi_gen1.h

@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2022-2024 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#ifndef __IRIS_HFI_GEN1_H__
+#define __IRIS_HFI_GEN1_H__
+
+struct iris_inst;
+
+struct iris_inst *iris_hfi_gen1_get_instance(void);
+
+#endif

drivers/media/platform/qcom/iris/iris_hfi_gen1_command.c

@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2022-2024 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include "iris_hfi_gen1.h"
+#include "iris_instance.h"
+
+struct iris_inst *iris_hfi_gen1_get_instance(void)
+{
+	return kzalloc(sizeof(struct iris_inst), GFP_KERNEL);
+}

drivers/media/platform/qcom/iris/iris_hfi_gen2.h

@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2022-2024 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#ifndef __IRIS_HFI_GEN2_H__
+#define __IRIS_HFI_GEN2_H__
+
+#include "iris_instance.h"
+
+/**
+ * struct iris_inst_hfi_gen2 - holds per video instance parameters for hfi_gen2
+ *
+ * @inst: pointer to iris_instance structure
+ */
+struct iris_inst_hfi_gen2 {
+	struct iris_inst		inst;
+};
+
+struct iris_inst *iris_hfi_gen2_get_instance(void);
+
+#endif

drivers/media/platform/qcom/iris/iris_hfi_gen2_command.c

@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2022-2024 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include "iris_hfi_gen2.h"
+
+struct iris_inst *iris_hfi_gen2_get_instance(void)
+{
+	return kzalloc(sizeof(struct iris_inst_hfi_gen2), GFP_KERNEL);
+}

drivers/media/platform/qcom/iris/iris_instance.h

@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2022-2024 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#ifndef __IRIS_INSTANCE_H__
+#define __IRIS_INSTANCE_H__
+
+#include "iris_core.h"
+
+/**
+ * struct iris_inst - holds per video instance parameters
+ *
+ * @core: pointer to core structure
+ * @ctx_q_lock: lock to serialize queues related ioctls
+ * @lock: lock to seralise forward and reverse threads
+ * @fh: reference of v4l2 file handler
+ * @m2m_dev:	a reference to m2m device structure
+ * @m2m_ctx:	a reference to m2m context structure
+ */
+
+struct iris_inst {
+	struct iris_core		*core;
+	struct mutex			ctx_q_lock;/* lock to serialize queues related ioctls */
+	struct mutex			lock; /* lock to serialize forward and reverse threads */
+	struct v4l2_fh			fh;
+	struct v4l2_m2m_dev		*m2m_dev;
+	struct v4l2_m2m_ctx		*m2m_ctx;
+};
+
+#endif

drivers/media/platform/qcom/iris/iris_platform_common.h

@@ -20,6 +20,7 @@ struct platform_clk_data {
 };
 
 struct iris_platform_data {
+	struct iris_inst *(*get_instance)(void);
 	const struct icc_info *icc_tbl;
 	unsigned int icc_tbl_size;
 	const char * const *pmdomain_tbl;

drivers/media/platform/qcom/iris/iris_platform_sm8550.c

@@ -4,6 +4,7 @@
  */
 
 #include "iris_core.h"
+#include "iris_hfi_gen2.h"
 #include "iris_platform_common.h"
 
 static const struct icc_info sm8550_icc_table[] = {
@@ -24,6 +25,7 @@ static const struct platform_clk_data sm8550_clk_table[] = {
 };
 
 struct iris_platform_data sm8550_data = {
+	.get_instance = iris_hfi_gen2_get_instance,
 	.icc_tbl = sm8550_icc_table,
 	.icc_tbl_size = ARRAY_SIZE(sm8550_icc_table),
 	.clk_rst_tbl = sm8550_clk_reset_table,

drivers/media/platform/qcom/iris/iris_probe.c

@@ -11,6 +11,7 @@
 #include <linux/reset.h>
 
 #include "iris_core.h"
+#include "iris_vidc.h"
 
 static int iris_init_icc(struct iris_core *core)
 {
@@ -139,6 +140,7 @@ static int iris_register_video_device(struct iris_core *core)
 
 	strscpy(vdev->name, "qcom-iris-decoder", sizeof(vdev->name));
 	vdev->release = video_device_release;
+	vdev->fops = core->iris_v4l2_file_ops;
 	vdev->vfl_dir = VFL_DIR_M2M;
 	vdev->v4l2_dev = &core->v4l2_dev;
 	vdev->device_caps = V4L2_CAP_VIDEO_M2M_MPLANE | V4L2_CAP_STREAMING;
@@ -192,6 +194,7 @@ static int iris_probe(struct platform_device *pdev)
 
 	core->iris_platform_data = of_device_get_match_data(core->dev);
 
+	iris_init_ops(core);
 	ret = iris_init_resources(core);
 	if (ret)
 		return ret;

drivers/media/platform/qcom/iris/iris_vidc.c

@@ -0,0 +1,147 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2022-2024 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-mem2mem.h>
+
+#include "iris_vidc.h"
+#include "iris_instance.h"
+#include "iris_platform_common.h"
+
+#define IRIS_DRV_NAME "iris_driver"
+#define IRIS_BUS_NAME "platform:iris_icc"
+#define STEP_WIDTH 1
+#define STEP_HEIGHT 1
+
+static void iris_v4l2_fh_init(struct iris_inst *inst)
+{
+	v4l2_fh_init(&inst->fh, inst->core->vdev_dec);
+	v4l2_fh_add(&inst->fh);
+}
+
+static void iris_v4l2_fh_deinit(struct iris_inst *inst)
+{
+	v4l2_fh_del(&inst->fh);
+	v4l2_fh_exit(&inst->fh);
+}
+
+static inline struct iris_inst *iris_get_inst(struct file *filp, void *fh)
+{
+	return container_of(filp->private_data, struct iris_inst, fh);
+}
+
+static void iris_m2m_device_run(void *priv)
+{
+}
+
+static void iris_m2m_job_abort(void *priv)
+{
+	struct iris_inst *inst = priv;
+	struct v4l2_m2m_ctx *m2m_ctx = inst->m2m_ctx;
+
+	v4l2_m2m_job_finish(inst->m2m_dev, m2m_ctx);
+}
+
+static const struct v4l2_m2m_ops iris_m2m_ops = {
+	.device_run = iris_m2m_device_run,
+	.job_abort = iris_m2m_job_abort,
+};
+
+static int
+iris_m2m_queue_init(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq)
+{
+	struct iris_inst *inst = priv;
+	int ret;
+
+	src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
+	src_vq->io_modes = VB2_MMAP | VB2_DMABUF;
+	src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
+	src_vq->drv_priv = inst;
+	src_vq->dev = inst->core->dev;
+	src_vq->lock = &inst->ctx_q_lock;
+	ret = vb2_queue_init(src_vq);
+	if (ret)
+		return ret;
+
+	dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
+	dst_vq->io_modes = VB2_MMAP | VB2_DMABUF;
+	dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
+	dst_vq->drv_priv = inst;
+	dst_vq->dev = inst->core->dev;
+	dst_vq->lock = &inst->ctx_q_lock;
+
+	return vb2_queue_init(dst_vq);
+}
+
+int iris_open(struct file *filp)
+{
+	struct iris_core *core = video_drvdata(filp);
+	struct iris_inst *inst;
+	int ret;
+
+	inst = core->iris_platform_data->get_instance();
+	if (!inst)
+		return -ENOMEM;
+
+	inst->core = core;
+
+	mutex_init(&inst->ctx_q_lock);
+
+	iris_v4l2_fh_init(inst);
+
+	inst->m2m_dev = v4l2_m2m_init(&iris_m2m_ops);
+	if (IS_ERR_OR_NULL(inst->m2m_dev)) {
+		ret = -EINVAL;
+		goto fail_v4l2_fh_deinit;
+	}
+
+	inst->m2m_ctx = v4l2_m2m_ctx_init(inst->m2m_dev, inst, iris_m2m_queue_init);
+	if (IS_ERR_OR_NULL(inst->m2m_ctx)) {
+		ret = -EINVAL;
+		goto fail_m2m_release;
+	}
+
+	inst->fh.m2m_ctx = inst->m2m_ctx;
+	filp->private_data = &inst->fh;
+
+	return 0;
+
+fail_m2m_release:
+	v4l2_m2m_release(inst->m2m_dev);
+fail_v4l2_fh_deinit:
+	iris_v4l2_fh_deinit(inst);
+	mutex_destroy(&inst->ctx_q_lock);
+	kfree(inst);
+
+	return ret;
+}
+
+int iris_close(struct file *filp)
+{
+	struct iris_inst *inst = iris_get_inst(filp, NULL);
+
+	v4l2_m2m_ctx_release(inst->m2m_ctx);
+	v4l2_m2m_release(inst->m2m_dev);
+	iris_v4l2_fh_deinit(inst);
+	mutex_destroy(&inst->ctx_q_lock);
+	kfree(inst);
+	filp->private_data = NULL;
+
+	return 0;
+}
+
+static struct v4l2_file_operations iris_v4l2_file_ops = {
+	.owner                          = THIS_MODULE,
+	.open                           = iris_open,
+	.release                        = iris_close,
+	.unlocked_ioctl                 = video_ioctl2,
+	.poll                           = v4l2_m2m_fop_poll,
+	.mmap                           = v4l2_m2m_fop_mmap,
+};
+
+void iris_init_ops(struct iris_core *core)
+{
+	core->iris_v4l2_file_ops = &iris_v4l2_file_ops;
+}

drivers/media/platform/qcom/iris/iris_vidc.h

@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2022-2024 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#ifndef __IRIS_VIDC_H__
+#define __IRIS_VIDC_H__
+
+struct iris_core;
+
+void iris_init_ops(struct iris_core *core);
+int iris_open(struct file *filp);
+int iris_close(struct file *filp);
+
+#endif