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From:   Vikash Garodia <quic_vgarodia@quicinc.com>
To:     <stanimir.k.varbanov@gmail.com>, <agross@kernel.org>,
        <andersson@kernel.org>, <konrad.dybcio@linaro.org>,
        <mchehab@kernel.org>, <hans.verkuil@cisco.com>,
        <linux-kernel@vger.kernel.org>, <linux-media@vger.kernel.org>,
        <linux-arm-msm@vger.kernel.org>
CC:     <quic_dikshita@quicinc.com>,
        Vikash Garodia <quic_vgarodia@quicinc.com>
Subject: [PATCH 02/33] iris: vidc: add core functions
Date:   Fri, 28 Jul 2023 18:53:13 +0530
Message-ID: <1690550624-14642-3-git-send-email-quic_vgarodia@quicinc.com>
In-Reply-To: <1690550624-14642-1-git-send-email-quic_vgarodia@quicinc.com>
References: <1690550624-14642-1-git-send-email-quic_vgarodia@quicinc.com>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

From: Dikshita Agarwal <quic_dikshita@quicinc.com>

This implements the platform driver methods, file
operations and v4l2 registration.

Signed-off-by: Dikshita Agarwal <quic_dikshita@quicinc.com>
Signed-off-by: Vikash Garodia <quic_vgarodia@quicinc.com>
---
 .../platform/qcom/iris/vidc/src/msm_vidc_probe.c   | 660 +++++++++++++++++++++
 1 file changed, 660 insertions(+)
 create mode 100644 drivers/media/platform/qcom/iris/vidc/src/msm_vidc_probe.c

diff --git a/drivers/media/platform/qcom/iris/vidc/src/msm_vidc_probe.c b/drivers/media/platform/qcom/iris/vidc/src/msm_vidc_probe.c
new file mode 100644
index 0000000..43439cb
--- /dev/null
+++ b/drivers/media/platform/qcom/iris/vidc/src/msm_vidc_probe.c
@@ -0,0 +1,660 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2020-2022, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/iommu.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/stringify.h>
+#include <linux/version.h>
+#include <linux/workqueue.h>
+
+#include "msm_vidc_core.h"
+#include "msm_vidc_debug.h"
+#include "msm_vidc_driver.h"
+#include "msm_vidc_internal.h"
+#include "msm_vidc_memory.h"
+#include "msm_vidc_platform.h"
+#include "msm_vidc_state.h"
+#include "venus_hfi.h"
+
+#define BASE_DEVICE_NUMBER 32
+
+struct msm_vidc_core *g_core;
+
+static inline bool is_video_device(struct device *dev)
+{
+	return !!(of_device_is_compatible(dev->of_node, "qcom,sm8550-vidc"));
+}
+
+static inline bool is_video_context_bank_device(struct device *dev)
+{
+	return !!(of_device_is_compatible(dev->of_node, "qcom,vidc,cb-ns"));
+}
+
+static int msm_vidc_init_resources(struct msm_vidc_core *core)
+{
+	struct msm_vidc_resource *res = NULL;
+	int rc = 0;
+
+	res = devm_kzalloc(&core->pdev->dev, sizeof(*res), GFP_KERNEL);
+	if (!res) {
+		d_vpr_e("%s: failed to alloc memory for resource\n", __func__);
+		return -ENOMEM;
+	}
+	core->resource = res;
+
+	rc = call_res_op(core, init, core);
+	if (rc) {
+		d_vpr_e("%s: Failed to init resources: %d\n", __func__, rc);
+		return rc;
+	}
+
+	return 0;
+}
+
+static const struct of_device_id msm_vidc_dt_match[] = {
+	{.compatible = "qcom,sm8550-vidc"},
+	{.compatible = "qcom,vidc,cb-ns"},
+	MSM_VIDC_EMPTY_BRACE
+};
+MODULE_DEVICE_TABLE(of, msm_vidc_dt_match);
+
+static void msm_vidc_release_video_device(struct video_device *vdev)
+{
+	d_vpr_e("%s: video device released\n", __func__);
+}
+
+static void msm_vidc_unregister_video_device(struct msm_vidc_core *core,
+					     enum msm_vidc_domain_type type)
+{
+	int index;
+
+	if (type == MSM_VIDC_DECODER)
+		index = 0;
+	else if (type == MSM_VIDC_ENCODER)
+		index = 1;
+	else
+		return;
+
+	v4l2_m2m_release(core->vdev[index].m2m_dev);
+
+	video_set_drvdata(&core->vdev[index].vdev, NULL);
+	video_unregister_device(&core->vdev[index].vdev);
+}
+
+static int msm_vidc_register_video_device(struct msm_vidc_core *core,
+					  enum msm_vidc_domain_type type, int nr)
+{
+	int rc = 0;
+	int index;
+
+	d_vpr_h("%s: domain %d\n", __func__, type);
+
+	if (type == MSM_VIDC_DECODER)
+		index = 0;
+	else if (type == MSM_VIDC_ENCODER)
+		index = 1;
+	else
+		return -EINVAL;
+
+	core->vdev[index].vdev.release =
+		msm_vidc_release_video_device;
+	core->vdev[index].vdev.fops = core->v4l2_file_ops;
+	if (type == MSM_VIDC_DECODER)
+		core->vdev[index].vdev.ioctl_ops = core->v4l2_ioctl_ops_dec;
+	else
+		core->vdev[index].vdev.ioctl_ops = core->v4l2_ioctl_ops_enc;
+	core->vdev[index].vdev.vfl_dir = VFL_DIR_M2M;
+	core->vdev[index].type = type;
+	core->vdev[index].vdev.v4l2_dev = &core->v4l2_dev;
+	core->vdev[index].vdev.device_caps = core->capabilities[DEVICE_CAPS].value;
+	rc = video_register_device(&core->vdev[index].vdev,
+				   VFL_TYPE_VIDEO, nr);
+	if (rc) {
+		d_vpr_e("Failed to register the video device\n");
+		return rc;
+	}
+	video_set_drvdata(&core->vdev[index].vdev, core);
+
+	core->vdev[index].m2m_dev = v4l2_m2m_init(core->v4l2_m2m_ops);
+	if (IS_ERR(core->vdev[index].m2m_dev)) {
+		d_vpr_e("Failed to initialize V4L2 M2M device\n");
+		rc = PTR_ERR(core->vdev[index].m2m_dev);
+		goto m2m_init_failed;
+	}
+
+	return 0;
+
+m2m_init_failed:
+	video_unregister_device(&core->vdev[index].vdev);
+	return rc;
+}
+
+static int msm_vidc_deinitialize_core(struct msm_vidc_core *core)
+{
+	int rc = 0;
+
+	if (!core) {
+		d_vpr_e("%s: invalid params\n", __func__);
+		return -EINVAL;
+	}
+
+	mutex_destroy(&core->lock);
+	msm_vidc_update_core_state(core, MSM_VIDC_CORE_DEINIT, __func__);
+
+	if (core->batch_workq)
+		destroy_workqueue(core->batch_workq);
+
+	if (core->pm_workq)
+		destroy_workqueue(core->pm_workq);
+
+	core->batch_workq = NULL;
+	core->pm_workq = NULL;
+
+	return rc;
+}
+
+static int msm_vidc_initialize_core(struct msm_vidc_core *core)
+{
+	int rc = 0;
+
+	msm_vidc_update_core_state(core, MSM_VIDC_CORE_DEINIT, __func__);
+
+	core->pm_workq = create_singlethread_workqueue("pm_workq");
+	if (!core->pm_workq) {
+		d_vpr_e("%s: create pm workq failed\n", __func__);
+		rc = -EINVAL;
+		goto exit;
+	}
+
+	core->batch_workq = create_singlethread_workqueue("batch_workq");
+	if (!core->batch_workq) {
+		d_vpr_e("%s: create batch workq failed\n", __func__);
+		rc = -EINVAL;
+		goto exit;
+	}
+
+	core->packet_size = VIDC_IFACEQ_VAR_HUGE_PKT_SIZE;
+	core->packet = devm_kzalloc(&core->pdev->dev, core->packet_size, GFP_KERNEL);
+	if (!core->packet) {
+		d_vpr_e("%s: failed to alloc core packet\n", __func__);
+		rc = -ENOMEM;
+		goto exit;
+	}
+
+	core->response_packet = devm_kzalloc(&core->pdev->dev, core->packet_size, GFP_KERNEL);
+	if (!core->packet) {
+		d_vpr_e("%s: failed to alloc core response packet\n", __func__);
+		rc = -ENOMEM;
+		goto exit;
+	}
+
+	mutex_init(&core->lock);
+	INIT_LIST_HEAD(&core->instances);
+	INIT_LIST_HEAD(&core->dangling_instances);
+
+	INIT_DELAYED_WORK(&core->pm_work, venus_hfi_pm_work_handler);
+	INIT_DELAYED_WORK(&core->fw_unload_work, msm_vidc_fw_unload_handler);
+
+	return 0;
+exit:
+	if (core->batch_workq)
+		destroy_workqueue(core->batch_workq);
+	if (core->pm_workq)
+		destroy_workqueue(core->pm_workq);
+	core->batch_workq = NULL;
+	core->pm_workq = NULL;
+
+	return rc;
+}
+
+static void msm_vidc_devm_deinit_core(void *res)
+{
+	struct msm_vidc_core *core = res;
+
+	msm_vidc_deinitialize_core(core);
+}
+
+static int msm_vidc_devm_init_core(struct device *dev, struct msm_vidc_core *core)
+{
+	int rc = 0;
+
+	if (!dev || !core) {
+		d_vpr_e("%s: invalid params\n", __func__);
+		return -EINVAL;
+	}
+
+	rc = msm_vidc_initialize_core(core);
+	if (rc) {
+		d_vpr_e("%s: init failed with %d\n", __func__, rc);
+		return rc;
+	}
+
+	rc = devm_add_action_or_reset(dev, msm_vidc_devm_deinit_core, (void *)core);
+	if (rc)
+		return -EINVAL;
+
+	return rc;
+}
+
+static void msm_vidc_devm_debugfs_put(void *res)
+{
+	struct dentry *parent = res;
+
+	debugfs_remove_recursive(parent);
+}
+
+static struct dentry *msm_vidc_devm_debugfs_get(struct device *dev)
+{
+	struct dentry *parent = NULL;
+	int rc = 0;
+
+	if (!dev) {
+		d_vpr_e("%s: invalid params\n", __func__);
+		return NULL;
+	}
+
+	parent = msm_vidc_debugfs_init_drv();
+	if (!parent)
+		return NULL;
+
+	rc = devm_add_action_or_reset(dev, msm_vidc_devm_debugfs_put, (void *)parent);
+	if (rc)
+		return NULL;
+
+	return parent;
+}
+
+static int msm_vidc_setup_context_bank(struct msm_vidc_core *core,
+				       struct device *dev)
+{
+	struct context_bank_info *cb = NULL;
+	int rc = 0;
+
+	cb = msm_vidc_get_context_bank_for_device(core, dev);
+	if (!cb) {
+		d_vpr_e("%s: Failed to get context bank device for %s\n",
+			__func__, dev_name(dev));
+		return -EIO;
+	}
+
+	/* populate dev & domain field */
+	cb->dev = dev;
+	cb->domain = iommu_get_domain_for_dev(cb->dev);
+	if (!cb->domain) {
+		d_vpr_e("%s: Failed to get iommu domain for %s\n", __func__, dev_name(dev));
+		return -EIO;
+	}
+
+	if (cb->dma_mask) {
+		rc = dma_set_mask_and_coherent(cb->dev, cb->dma_mask);
+		if (rc) {
+			d_vpr_e("%s: dma_set_mask_and_coherent failed\n", __func__);
+			return rc;
+		}
+	}
+
+	/*
+	 * configure device segment size and segment boundary to ensure
+	 * iommu mapping returns one mapping (which is required for partial
+	 * cache operations)
+	 */
+	if (!dev->dma_parms)
+		dev->dma_parms =
+			devm_kzalloc(dev, sizeof(*dev->dma_parms), GFP_KERNEL);
+	dma_set_max_seg_size(dev, (unsigned int)DMA_BIT_MASK(32));
+	dma_set_seg_boundary(dev, (unsigned long)DMA_BIT_MASK(64));
+
+	iommu_set_fault_handler(cb->domain, msm_vidc_smmu_fault_handler, (void *)core);
+
+	d_vpr_h("%s: name %s addr start %x size %x secure %d\n",
+		__func__, cb->name, cb->addr_range.start,
+		cb->addr_range.size, cb->secure);
+	d_vpr_h("%s: dma_coherant %d region %d dev_name %s domain %pK dma_mask %llu\n",
+		__func__, cb->dma_coherant, cb->region, dev_name(cb->dev),
+		cb->domain, cb->dma_mask);
+
+	return rc;
+}
+
+static int msm_vidc_remove_video_device(struct platform_device *pdev)
+{
+	struct msm_vidc_core *core;
+
+	if (!pdev) {
+		d_vpr_e("%s: invalid input %pK", __func__, pdev);
+		return -EINVAL;
+	}
+
+	core = dev_get_drvdata(&pdev->dev);
+	if (!core) {
+		d_vpr_e("%s: invalid core\n", __func__);
+		return -EINVAL;
+	}
+
+	msm_vidc_core_deinit(core, true);
+	venus_hfi_queue_deinit(core);
+
+	msm_vidc_unregister_video_device(core, MSM_VIDC_ENCODER);
+	msm_vidc_unregister_video_device(core, MSM_VIDC_DECODER);
+
+	v4l2_device_unregister(&core->v4l2_dev);
+
+	d_vpr_h("depopulating sub devices\n");
+	/*
+	 * Trigger remove for each sub-device i.e. qcom,context-bank,xxxx
+	 * When msm_vidc_remove is called for each sub-device, destroy
+	 * context-bank mappings.
+	 */
+	of_platform_depopulate(&pdev->dev);
+
+	dev_set_drvdata(&pdev->dev, NULL);
+	g_core = NULL;
+	d_vpr_h("%s(): succssful\n", __func__);
+
+	return 0;
+}
+
+static int msm_vidc_remove_context_bank(struct platform_device *pdev)
+{
+	d_vpr_h("%s(): %s\n", __func__, dev_name(&pdev->dev));
+
+	return 0;
+}
+
+static int msm_vidc_remove(struct platform_device *pdev)
+{
+	/*
+	 * Sub devices remove will be triggered by of_platform_depopulate()
+	 * after core_deinit(). It return immediately after completing
+	 * sub-device remove.
+	 */
+	if (is_video_device(&pdev->dev))
+		return msm_vidc_remove_video_device(pdev);
+	else if (is_video_context_bank_device(&pdev->dev))
+		return msm_vidc_remove_context_bank(pdev);
+
+	/* How did we end up here? */
+	WARN_ON(1);
+	return -EINVAL;
+}
+
+static int msm_vidc_probe_video_device(struct platform_device *pdev)
+{
+	int rc = 0;
+	struct msm_vidc_core *core = NULL;
+	int nr = BASE_DEVICE_NUMBER;
+
+	d_vpr_h("%s: %s\n", __func__, dev_name(&pdev->dev));
+
+	core = devm_kzalloc(&pdev->dev, sizeof(struct msm_vidc_core), GFP_KERNEL);
+	if (!core) {
+		d_vpr_e("%s: failed to alloc memory for core\n", __func__);
+		return -ENOMEM;
+	}
+	g_core = core;
+
+	core->pdev = pdev;
+	dev_set_drvdata(&pdev->dev, core);
+
+	core->debugfs_parent = msm_vidc_devm_debugfs_get(&pdev->dev);
+	if (!core->debugfs_parent)
+		d_vpr_h("Failed to create debugfs for msm_vidc\n");
+
+	rc = msm_vidc_devm_init_core(&pdev->dev, core);
+	if (rc) {
+		d_vpr_e("%s: init core failed with %d\n", __func__, rc);
+		goto init_core_failed;
+	}
+
+	rc = msm_vidc_init_platform(core);
+	if (rc) {
+		d_vpr_e("%s: init platform failed with %d\n", __func__, rc);
+		rc = -EINVAL;
+		goto init_plat_failed;
+	}
+
+	rc = msm_vidc_init_resources(core);
+	if (rc) {
+		d_vpr_e("%s: init resource failed with %d\n", __func__, rc);
+		goto init_res_failed;
+	}
+
+	rc = msm_vidc_init_core_caps(core);
+	if (rc) {
+		d_vpr_e("%s: init core caps failed with %d\n", __func__, rc);
+		goto init_res_failed;
+	}
+
+	rc = msm_vidc_init_instance_caps(core);
+	if (rc) {
+		d_vpr_e("%s: init inst cap failed with %d\n", __func__, rc);
+		goto init_inst_caps_fail;
+	}
+
+	core->debugfs_root = msm_vidc_debugfs_init_core(core);
+	if (!core->debugfs_root)
+		d_vpr_h("Failed to init debugfs core\n");
+
+	d_vpr_h("populating sub devices\n");
+	/*
+	 * Trigger probe for each sub-device i.e. qcom,msm-vidc,context-bank.
+	 * When msm_vidc_probe is called for each sub-device, parse the
+	 * context-bank details.
+	 */
+	rc = of_platform_populate(pdev->dev.of_node, msm_vidc_dt_match, NULL,
+				  &pdev->dev);
+	if (rc) {
+		d_vpr_e("Failed to trigger probe for sub-devices\n");
+		goto sub_dev_failed;
+	}
+
+	rc = v4l2_device_register(&pdev->dev, &core->v4l2_dev);
+	if (rc) {
+		d_vpr_e("Failed to register v4l2 device\n");
+		goto v4l2_reg_failed;
+	}
+
+	/* setup the decoder device */
+	rc = msm_vidc_register_video_device(core, MSM_VIDC_DECODER, nr);
+	if (rc) {
+		d_vpr_e("Failed to register video decoder\n");
+		goto dec_reg_failed;
+	}
+
+	/* setup the encoder device */
+	rc = msm_vidc_register_video_device(core, MSM_VIDC_ENCODER, nr + 1);
+	if (rc) {
+		d_vpr_e("Failed to register video encoder\n");
+		goto enc_reg_failed;
+	}
+
+	rc = venus_hfi_queue_init(core);
+	if (rc) {
+		d_vpr_e("%s: interface queues init failed\n", __func__);
+		goto queues_init_failed;
+	}
+
+	rc = msm_vidc_core_init(core);
+	if (rc) {
+		d_vpr_e("%s: sys init failed\n", __func__);
+		goto core_init_failed;
+	}
+
+	d_vpr_h("%s(): succssful\n", __func__);
+
+	return rc;
+
+core_init_failed:
+	venus_hfi_queue_deinit(core);
+queues_init_failed:
+	of_platform_depopulate(&pdev->dev);
+sub_dev_failed:
+	msm_vidc_unregister_video_device(core, MSM_VIDC_ENCODER);
+enc_reg_failed:
+	msm_vidc_unregister_video_device(core, MSM_VIDC_DECODER);
+dec_reg_failed:
+	v4l2_device_unregister(&core->v4l2_dev);
+v4l2_reg_failed:
+init_inst_caps_fail:
+init_res_failed:
+init_plat_failed:
+init_core_failed:
+	dev_set_drvdata(&pdev->dev, NULL);
+	g_core = NULL;
+
+	return rc;
+}
+
+static int msm_vidc_probe_context_bank(struct platform_device *pdev)
+{
+	struct msm_vidc_core *core = NULL;
+	int rc = 0;
+
+	if (!pdev) {
+		d_vpr_e("%s: Invalid platform device %pK", __func__, pdev);
+		return -EINVAL;
+	} else if (!pdev->dev.parent) {
+		d_vpr_e("%s: Failed to find a parent for %s\n",
+			__func__, dev_name(&pdev->dev));
+		return -ENODEV;
+	}
+
+	d_vpr_h("%s(): %s\n", __func__, dev_name(&pdev->dev));
+
+	core = dev_get_drvdata(pdev->dev.parent);
+	if (!core) {
+		d_vpr_e("%s: core not found in device %s",
+			__func__, dev_name(pdev->dev.parent));
+		return -EINVAL;
+	}
+
+	rc = msm_vidc_setup_context_bank(core, &pdev->dev);
+	if (rc) {
+		d_vpr_e("%s: Failed to probe context bank %s\n",
+			__func__, dev_name(&pdev->dev));
+		return rc;
+	}
+
+	return rc;
+}
+
+static int msm_vidc_probe(struct platform_device *pdev)
+{
+	if (!pdev) {
+		d_vpr_e("%s: invalid params\n", __func__);
+		return -EINVAL;
+	}
+
+	/*
+	 * Sub devices probe will be triggered by of_platform_populate() towards
+	 * the end of the probe function after msm-vidc device probe is
+	 * completed. Return immediately after completing sub-device probe.
+	 */
+	if (is_video_device(&pdev->dev))
+		return msm_vidc_probe_video_device(pdev);
+	else if (is_video_context_bank_device(&pdev->dev))
+		return msm_vidc_probe_context_bank(pdev);
+
+	/* How did we end up here? */
+	WARN_ON(1);
+	return -EINVAL;
+}
+
+static int msm_vidc_pm_suspend(struct device *dev)
+{
+	int rc = 0;
+	struct msm_vidc_core *core;
+	enum msm_vidc_allow allow = MSM_VIDC_DISALLOW;
+
+	/*
+	 * Bail out if
+	 * - driver possibly not probed yet
+	 * - not the main device. We don't support power management on
+	 *   subdevices (e.g. context banks)
+	 */
+	if (!dev || !dev->driver || !is_video_device(dev))
+		return 0;
+
+	core = dev_get_drvdata(dev);
+	if (!core) {
+		d_vpr_e("%s: invalid core\n", __func__);
+		return -EINVAL;
+	}
+
+	core_lock(core, __func__);
+	allow = msm_vidc_allow_pm_suspend(core);
+
+	if (allow == MSM_VIDC_IGNORE) {
+		d_vpr_h("%s: pm already suspended\n", __func__);
+		msm_vidc_change_core_sub_state(core, 0, CORE_SUBSTATE_PM_SUSPEND, __func__);
+		rc = 0;
+		goto unlock;
+	} else if (allow != MSM_VIDC_ALLOW) {
+		d_vpr_h("%s: pm suspend not allowed\n", __func__);
+		rc = 0;
+		goto unlock;
+	}
+
+	rc = msm_vidc_suspend(core);
+	if (rc == -EOPNOTSUPP)
+		rc = 0;
+	else if (rc)
+		d_vpr_e("Failed to suspend: %d\n", rc);
+	else
+		msm_vidc_change_core_sub_state(core, 0, CORE_SUBSTATE_PM_SUSPEND, __func__);
+
+unlock:
+	core_unlock(core, __func__);
+	return rc;
+}
+
+static int msm_vidc_pm_resume(struct device *dev)
+{
+	struct msm_vidc_core *core;
+
+	/*
+	 * Bail out if
+	 * - driver possibly not probed yet
+	 * - not the main device. We don't support power management on
+	 *   subdevices (e.g. context banks)
+	 */
+	if (!dev || !dev->driver || !is_video_device(dev))
+		return 0;
+
+	core = dev_get_drvdata(dev);
+	if (!core) {
+		d_vpr_e("%s: invalid core\n", __func__);
+		return -EINVAL;
+	}
+
+	/* remove PM suspend from core sub_state */
+	core_lock(core, __func__);
+	msm_vidc_change_core_sub_state(core, CORE_SUBSTATE_PM_SUSPEND, 0, __func__);
+	core_unlock(core, __func__);
+
+	return 0;
+}
+
+static const struct dev_pm_ops msm_vidc_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(msm_vidc_pm_suspend, msm_vidc_pm_resume)
+};
+
+struct platform_driver msm_vidc_driver = {
+	.probe = msm_vidc_probe,
+	.remove = msm_vidc_remove,
+	.driver = {
+		.name = "msm_vidc_v4l2",
+		.of_match_table = msm_vidc_dt_match,
+		.pm = &msm_vidc_pm_ops,
+	},
+};
+
+module_platform_driver(msm_vidc_driver);
+MODULE_LICENSE("GPL");
-- 
2.7.4