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// SPDX-License-Identifier: GPL-2.0
/*
*
* (C) COPYRIGHT 2019-2020 ARM Limited. All rights reserved.
*
* 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
*
*/
/**
* @file mali_kbase_arbif.c
* Mali arbiter interface APIs to share GPU between Virtual Machines
*/
#include <mali_kbase.h>
#include "mali_kbase_arbif.h"
#include <tl/mali_kbase_tracepoints.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include "mali_kbase_arbiter_interface.h"
static void on_gpu_stop(struct device *dev)
{
struct kbase_device *kbdev = dev_get_drvdata(dev);
KBASE_TLSTREAM_TL_EVENT_ARB_STOP_REQUESTED(kbdev, kbdev);
kbase_arbiter_pm_vm_event(kbdev, KBASE_VM_GPU_STOP_EVT);
}
static void on_gpu_granted(struct device *dev)
{
struct kbase_device *kbdev = dev_get_drvdata(dev);
KBASE_TLSTREAM_TL_EVENT_ARB_GRANTED(kbdev, kbdev);
kbase_arbiter_pm_vm_event(kbdev, KBASE_VM_GPU_GRANTED_EVT);
}
static void on_gpu_lost(struct device *dev)
{
struct kbase_device *kbdev = dev_get_drvdata(dev);
kbase_arbiter_pm_vm_event(kbdev, KBASE_VM_GPU_LOST_EVT);
}
int kbase_arbif_init(struct kbase_device *kbdev)
{
#ifdef CONFIG_OF
struct arbiter_if_arb_vm_ops ops;
struct arbiter_if_dev *arb_if;
struct device_node *arbiter_if_node;
struct platform_device *pdev;
int err;
dev_dbg(kbdev->dev, "%s\n", __func__);
arbiter_if_node = of_parse_phandle(kbdev->dev->of_node,
"arbiter_if", 0);
if (!arbiter_if_node) {
dev_dbg(kbdev->dev, "No arbiter_if in Device Tree\n");
/* no arbiter interface defined in device tree */
kbdev->arb.arb_dev = NULL;
kbdev->arb.arb_if = NULL;
return 0;
}
pdev = of_find_device_by_node(arbiter_if_node);
if (!pdev) {
dev_err(kbdev->dev, "Failed to find arbiter_if device\n");
return -EPROBE_DEFER;
}
if (!pdev->dev.driver || !try_module_get(pdev->dev.driver->owner)) {
dev_err(kbdev->dev, "arbiter_if driver not available\n");
return -EPROBE_DEFER;
}
kbdev->arb.arb_dev = &pdev->dev;
arb_if = platform_get_drvdata(pdev);
if (!arb_if) {
dev_err(kbdev->dev, "arbiter_if driver not ready\n");
module_put(pdev->dev.driver->owner);
return -EPROBE_DEFER;
}
kbdev->arb.arb_if = arb_if;
ops.arb_vm_gpu_stop = on_gpu_stop;
ops.arb_vm_gpu_granted = on_gpu_granted;
ops.arb_vm_gpu_lost = on_gpu_lost;
/* register kbase arbiter_if callbacks */
if (arb_if->vm_ops.vm_arb_register_dev) {
err = arb_if->vm_ops.vm_arb_register_dev(arb_if,
kbdev->dev, &ops);
if (err) {
dev_err(kbdev->dev, "Arbiter registration failed.\n");
module_put(pdev->dev.driver->owner);
return err;
}
}
#else /* CONFIG_OF */
dev_dbg(kbdev->dev, "No arbiter without Device Tree support\n");
kbdev->arb.arb_dev = NULL;
kbdev->arb.arb_if = NULL;
#endif
return 0;
}
void kbase_arbif_destroy(struct kbase_device *kbdev)
{
struct arbiter_if_dev *arb_if = kbdev->arb.arb_if;
if (arb_if && arb_if->vm_ops.vm_arb_unregister_dev) {
dev_dbg(kbdev->dev, "%s\n", __func__);
arb_if->vm_ops.vm_arb_unregister_dev(kbdev->arb.arb_if);
}
kbdev->arb.arb_if = NULL;
if (kbdev->arb.arb_dev)
module_put(kbdev->arb.arb_dev->driver->owner);
kbdev->arb.arb_dev = NULL;
}
void kbase_arbif_gpu_request(struct kbase_device *kbdev)
{
struct arbiter_if_dev *arb_if = kbdev->arb.arb_if;
if (arb_if && arb_if->vm_ops.vm_arb_gpu_request) {
dev_dbg(kbdev->dev, "%s\n", __func__);
arb_if->vm_ops.vm_arb_gpu_request(arb_if);
}
}
void kbase_arbif_gpu_stopped(struct kbase_device *kbdev, u8 gpu_required)
{
struct arbiter_if_dev *arb_if = kbdev->arb.arb_if;
if (arb_if && arb_if->vm_ops.vm_arb_gpu_stopped) {
dev_dbg(kbdev->dev, "%s\n", __func__);
KBASE_TLSTREAM_TL_EVENT_ARB_STOPPED(kbdev, kbdev);
arb_if->vm_ops.vm_arb_gpu_stopped(arb_if, gpu_required);
}
}
void kbase_arbif_gpu_active(struct kbase_device *kbdev)
{
struct arbiter_if_dev *arb_if = kbdev->arb.arb_if;
if (arb_if && arb_if->vm_ops.vm_arb_gpu_active) {
dev_dbg(kbdev->dev, "%s\n", __func__);
arb_if->vm_ops.vm_arb_gpu_active(arb_if);
}
}
void kbase_arbif_gpu_idle(struct kbase_device *kbdev)
{
struct arbiter_if_dev *arb_if = kbdev->arb.arb_if;
if (arb_if && arb_if->vm_ops.vm_arb_gpu_idle) {
dev_dbg(kbdev->dev, "vm_arb_gpu_idle\n");
arb_if->vm_ops.vm_arb_gpu_idle(arb_if);
}
}
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