// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2021 Microsoft
*/
#include <linux/efi.h>
#include <linux/hyperv.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <drm/drm_aperture.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_drv.h>
#include <drm/drm_fbdev_shmem.h>
#include <drm/drm_gem_shmem_helper.h>
#include <drm/drm_simple_kms_helper.h>
#include "hyperv_drm.h"
#define DRIVER_NAME "hyperv_drm"
#define DRIVER_DESC "DRM driver for Hyper-V synthetic video device"
#define DRIVER_DATE "2020"
#define DRIVER_MAJOR 1
#define DRIVER_MINOR 0
DEFINE_DRM_GEM_FOPS(hv_fops);
static struct drm_driver hyperv_driver = {
.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
.name = DRIVER_NAME,
.desc = DRIVER_DESC,
.date = DRIVER_DATE,
.major = DRIVER_MAJOR,
.minor = DRIVER_MINOR,
.fops = &hv_fops,
DRM_GEM_SHMEM_DRIVER_OPS,
};
static int hyperv_pci_probe(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
return 0;
}
static void hyperv_pci_remove(struct pci_dev *pdev)
{
}
static const struct pci_device_id hyperv_pci_tbl[] = {
{
.vendor = PCI_VENDOR_ID_MICROSOFT,
.device = PCI_DEVICE_ID_HYPERV_VIDEO,
},
{ /* end of list */ }
};
/*
* PCI stub to support gen1 VM.
*/
static struct pci_driver hyperv_pci_driver = {
.name = KBUILD_MODNAME,
.id_table = hyperv_pci_tbl,
.probe = hyperv_pci_probe,
.remove = hyperv_pci_remove,
};
static int hyperv_setup_vram(struct hyperv_drm_device *hv,
struct hv_device *hdev)
{
struct drm_device *dev = &hv->dev;
int ret;
hv->fb_size = (unsigned long)hv->mmio_megabytes * 1024 * 1024;
ret = vmbus_allocate_mmio(&hv->mem, hdev, 0, -1, hv->fb_size, 0x100000,
true);
if (ret) {
drm_err(dev, "Failed to allocate mmio\n");
return -ENOMEM;
}
/*
* Map the VRAM cacheable for performance. This is also required for VM
* connect to display properly for ARM64 Linux VM, as the host also maps
* the VRAM cacheable.
*/
hv->vram = ioremap_cache(hv->mem->start, hv->fb_size);
if (!hv->vram) {
drm_err(dev, "Failed to map vram\n");
ret = -ENOMEM;
goto error;
}
hv->fb_base = hv->mem->start;
return 0;
error:
vmbus_free_mmio(hv->mem->start, hv->fb_size);
return ret;
}
static int hyperv_vmbus_probe(struct hv_device *hdev,
const struct hv_vmbus_device_id *dev_id)
{
struct hyperv_drm_device *hv;
struct drm_device *dev;
int ret;
hv = devm_drm_dev_alloc(&hdev->device, &hyperv_driver,
struct hyperv_drm_device, dev);
if (IS_ERR(hv))
return PTR_ERR(hv);
dev = &hv->dev;
init_completion(&hv->wait);
hv_set_drvdata(hdev, hv);
hv->hdev = hdev;
ret = hyperv_connect_vsp(hdev);
if (ret) {
drm_err(dev, "Failed to connect to vmbus.\n");
goto err_hv_set_drv_data;
}
drm_aperture_remove_framebuffers(&hyperv_driver);
ret = hyperv_setup_vram(hv, hdev);
if (ret)
goto err_vmbus_close;
/*
* Should be done only once during init and resume. Failing to update
* vram location is not fatal. Device will update dirty area till
* preferred resolution only.
*/
ret = hyperv_update_vram_location(hdev, hv->fb_base);
if (ret)
drm_warn(dev, "Failed to update vram location.\n");
ret = hyperv_mode_config_init(hv);
if (ret)
goto err_free_mmio;
ret = drm_dev_register(dev, 0);
if (ret) {
drm_err(dev, "Failed to register drm driver.\n");
goto err_free_mmio;
}
drm_fbdev_shmem_setup(dev, 0);
return 0;
err_free_mmio:
vmbus_free_mmio(hv->mem->start, hv->fb_size);
err_vmbus_close:
vmbus_close(hdev->channel);
err_hv_set_drv_data:
hv_set_drvdata(hdev, NULL);
return ret;
}
static void hyperv_vmbus_remove(struct hv_device *hdev)
{
struct drm_device *dev = hv_get_drvdata(hdev);
struct hyperv_drm_device *hv = to_hv(dev);
drm_dev_unplug(dev);
drm_atomic_helper_shutdown(dev);
vmbus_close(hdev->channel);
hv_set_drvdata(hdev, NULL);
vmbus_free_mmio(hv->mem->start, hv->fb_size);
}
static void hyperv_vmbus_shutdown(struct hv_device *hdev)
{
drm_atomic_helper_shutdown(hv_get_drvdata(hdev));
}
static int hyperv_vmbus_suspend(struct hv_device *hdev)
{
struct drm_device *dev = hv_get_drvdata(hdev);
int ret;
ret = drm_mode_config_helper_suspend(dev);
if (ret)
return ret;
vmbus_close(hdev->channel);
return 0;
}
static int hyperv_vmbus_resume(struct hv_device *hdev)
{
struct drm_device *dev = hv_get_drvdata(hdev);
struct hyperv_drm_device *hv = to_hv(dev);
int ret;
ret = hyperv_connect_vsp(hdev);
if (ret)
return ret;
ret = hyperv_update_vram_location(hdev, hv->fb_base);
if (ret)
return ret;
return drm_mode_config_helper_resume(dev);
}
static const struct hv_vmbus_device_id hyperv_vmbus_tbl[] = {
/* Synthetic Video Device GUID */
{HV_SYNTHVID_GUID},
{}
};
static struct hv_driver hyperv_hv_driver = {
.name = KBUILD_MODNAME,
.id_table = hyperv_vmbus_tbl,
.probe = hyperv_vmbus_probe,
.remove = hyperv_vmbus_remove,
.shutdown = hyperv_vmbus_shutdown,
.suspend = hyperv_vmbus_suspend,
.resume = hyperv_vmbus_resume,
.driver = {
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
};
static int __init hyperv_init(void)
{
int ret;
if (drm_firmware_drivers_only())
return -ENODEV;
ret = pci_register_driver(&hyperv_pci_driver);
if (ret != 0)
return ret;
return vmbus_driver_register(&hyperv_hv_driver);
}
static void __exit hyperv_exit(void)
{
vmbus_driver_unregister(&hyperv_hv_driver);
pci_unregister_driver(&hyperv_pci_driver);
}
module_init(hyperv_init);
module_exit(hyperv_exit);
MODULE_DEVICE_TABLE(pci, hyperv_pci_tbl);
MODULE_DEVICE_TABLE(vmbus, hyperv_vmbus_tbl);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Deepak Rawat <[email protected]>");
MODULE_DESCRIPTION("DRM driver for Hyper-V synthetic video device");
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