332 строки
7.2 KiB
C
332 строки
7.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2021 Microsoft
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*/
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#include <linux/efi.h>
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#include <linux/hyperv.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <drm/drm_aperture.h>
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#include <drm/drm_atomic_helper.h>
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#include <drm/drm_drv.h>
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#include <drm/drm_fb_helper.h>
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#include <drm/drm_gem_shmem_helper.h>
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#include <drm/drm_simple_kms_helper.h>
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#include "hyperv_drm.h"
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#define DRIVER_NAME "hyperv_drm"
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#define DRIVER_DESC "DRM driver for Hyper-V synthetic video device"
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#define DRIVER_DATE "2020"
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#define DRIVER_MAJOR 1
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#define DRIVER_MINOR 0
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#define PCI_VENDOR_ID_MICROSOFT 0x1414
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#define PCI_DEVICE_ID_HYPERV_VIDEO 0x5353
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DEFINE_DRM_GEM_FOPS(hv_fops);
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static struct drm_driver hyperv_driver = {
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.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
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.name = DRIVER_NAME,
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.desc = DRIVER_DESC,
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.date = DRIVER_DATE,
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.major = DRIVER_MAJOR,
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.minor = DRIVER_MINOR,
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.fops = &hv_fops,
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DRM_GEM_SHMEM_DRIVER_OPS,
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};
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static int hyperv_pci_probe(struct pci_dev *pdev,
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const struct pci_device_id *ent)
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{
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return 0;
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}
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static void hyperv_pci_remove(struct pci_dev *pdev)
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{
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}
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static const struct pci_device_id hyperv_pci_tbl[] = {
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{
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.vendor = PCI_VENDOR_ID_MICROSOFT,
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.device = PCI_DEVICE_ID_HYPERV_VIDEO,
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},
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{ /* end of list */ }
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};
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/*
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* PCI stub to support gen1 VM.
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*/
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static struct pci_driver hyperv_pci_driver = {
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.name = KBUILD_MODNAME,
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.id_table = hyperv_pci_tbl,
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.probe = hyperv_pci_probe,
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.remove = hyperv_pci_remove,
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};
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static int hyperv_setup_gen1(struct hyperv_drm_device *hv)
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{
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struct drm_device *dev = &hv->dev;
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struct pci_dev *pdev;
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int ret;
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pdev = pci_get_device(PCI_VENDOR_ID_MICROSOFT,
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PCI_DEVICE_ID_HYPERV_VIDEO, NULL);
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if (!pdev) {
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drm_err(dev, "Unable to find PCI Hyper-V video\n");
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return -ENODEV;
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}
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ret = drm_aperture_remove_conflicting_pci_framebuffers(pdev, &hyperv_driver);
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if (ret) {
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drm_err(dev, "Not able to remove boot fb\n");
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return ret;
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}
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if (pci_request_region(pdev, 0, DRIVER_NAME) != 0)
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drm_warn(dev, "Cannot request framebuffer, boot fb still active?\n");
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if ((pdev->resource[0].flags & IORESOURCE_MEM) == 0) {
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drm_err(dev, "Resource at bar 0 is not IORESOURCE_MEM\n");
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ret = -ENODEV;
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goto error;
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}
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hv->fb_base = pci_resource_start(pdev, 0);
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hv->fb_size = pci_resource_len(pdev, 0);
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if (!hv->fb_base) {
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drm_err(dev, "Resource not available\n");
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ret = -ENODEV;
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goto error;
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}
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hv->fb_size = min(hv->fb_size,
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(unsigned long)(hv->mmio_megabytes * 1024 * 1024));
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hv->vram = devm_ioremap(&pdev->dev, hv->fb_base, hv->fb_size);
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if (!hv->vram) {
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drm_err(dev, "Failed to map vram\n");
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ret = -ENOMEM;
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}
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error:
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pci_dev_put(pdev);
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return ret;
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}
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static int hyperv_setup_gen2(struct hyperv_drm_device *hv,
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struct hv_device *hdev)
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{
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struct drm_device *dev = &hv->dev;
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int ret;
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drm_aperture_remove_conflicting_framebuffers(screen_info.lfb_base,
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screen_info.lfb_size,
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false,
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&hyperv_driver);
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hv->fb_size = (unsigned long)hv->mmio_megabytes * 1024 * 1024;
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ret = vmbus_allocate_mmio(&hv->mem, hdev, 0, -1, hv->fb_size, 0x100000,
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true);
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if (ret) {
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drm_err(dev, "Failed to allocate mmio\n");
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return -ENOMEM;
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}
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/*
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* Map the VRAM cacheable for performance. This is also required for VM
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* connect to display properly for ARM64 Linux VM, as the host also maps
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* the VRAM cacheable.
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*/
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hv->vram = ioremap_cache(hv->mem->start, hv->fb_size);
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if (!hv->vram) {
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drm_err(dev, "Failed to map vram\n");
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ret = -ENOMEM;
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goto error;
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}
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hv->fb_base = hv->mem->start;
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return 0;
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error:
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vmbus_free_mmio(hv->mem->start, hv->fb_size);
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return ret;
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}
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static int hyperv_vmbus_probe(struct hv_device *hdev,
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const struct hv_vmbus_device_id *dev_id)
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{
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struct hyperv_drm_device *hv;
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struct drm_device *dev;
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int ret;
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hv = devm_drm_dev_alloc(&hdev->device, &hyperv_driver,
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struct hyperv_drm_device, dev);
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if (IS_ERR(hv))
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return PTR_ERR(hv);
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dev = &hv->dev;
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init_completion(&hv->wait);
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hv_set_drvdata(hdev, hv);
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hv->hdev = hdev;
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ret = hyperv_connect_vsp(hdev);
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if (ret) {
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drm_err(dev, "Failed to connect to vmbus.\n");
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goto err_hv_set_drv_data;
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}
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if (efi_enabled(EFI_BOOT))
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ret = hyperv_setup_gen2(hv, hdev);
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else
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ret = hyperv_setup_gen1(hv);
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if (ret)
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goto err_vmbus_close;
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/*
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* Should be done only once during init and resume. Failing to update
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* vram location is not fatal. Device will update dirty area till
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* preferred resolution only.
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*/
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ret = hyperv_update_vram_location(hdev, hv->fb_base);
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if (ret)
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drm_warn(dev, "Failed to update vram location.\n");
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hv->dirt_needed = true;
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ret = hyperv_mode_config_init(hv);
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if (ret)
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goto err_vmbus_close;
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ret = drm_dev_register(dev, 0);
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if (ret) {
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drm_err(dev, "Failed to register drm driver.\n");
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goto err_vmbus_close;
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}
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drm_fbdev_generic_setup(dev, 0);
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return 0;
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err_vmbus_close:
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vmbus_close(hdev->channel);
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err_hv_set_drv_data:
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hv_set_drvdata(hdev, NULL);
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return ret;
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}
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static int hyperv_vmbus_remove(struct hv_device *hdev)
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{
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struct drm_device *dev = hv_get_drvdata(hdev);
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struct hyperv_drm_device *hv = to_hv(dev);
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struct pci_dev *pdev;
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drm_dev_unplug(dev);
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drm_atomic_helper_shutdown(dev);
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vmbus_close(hdev->channel);
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hv_set_drvdata(hdev, NULL);
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/*
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* Free allocated MMIO memory only on Gen2 VMs.
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* On Gen1 VMs, release the PCI device
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*/
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if (efi_enabled(EFI_BOOT)) {
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vmbus_free_mmio(hv->mem->start, hv->fb_size);
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} else {
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pdev = pci_get_device(PCI_VENDOR_ID_MICROSOFT,
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PCI_DEVICE_ID_HYPERV_VIDEO, NULL);
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if (!pdev) {
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drm_err(dev, "Unable to find PCI Hyper-V video\n");
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return -ENODEV;
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}
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pci_release_region(pdev, 0);
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pci_dev_put(pdev);
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}
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return 0;
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}
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static int hyperv_vmbus_suspend(struct hv_device *hdev)
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{
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struct drm_device *dev = hv_get_drvdata(hdev);
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int ret;
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ret = drm_mode_config_helper_suspend(dev);
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if (ret)
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return ret;
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vmbus_close(hdev->channel);
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return 0;
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}
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static int hyperv_vmbus_resume(struct hv_device *hdev)
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{
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struct drm_device *dev = hv_get_drvdata(hdev);
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struct hyperv_drm_device *hv = to_hv(dev);
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int ret;
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ret = hyperv_connect_vsp(hdev);
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if (ret)
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return ret;
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ret = hyperv_update_vram_location(hdev, hv->fb_base);
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if (ret)
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return ret;
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return drm_mode_config_helper_resume(dev);
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}
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static const struct hv_vmbus_device_id hyperv_vmbus_tbl[] = {
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/* Synthetic Video Device GUID */
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{HV_SYNTHVID_GUID},
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{}
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};
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static struct hv_driver hyperv_hv_driver = {
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.name = KBUILD_MODNAME,
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.id_table = hyperv_vmbus_tbl,
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.probe = hyperv_vmbus_probe,
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.remove = hyperv_vmbus_remove,
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.suspend = hyperv_vmbus_suspend,
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.resume = hyperv_vmbus_resume,
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.driver = {
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.probe_type = PROBE_PREFER_ASYNCHRONOUS,
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},
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};
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static int __init hyperv_init(void)
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{
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int ret;
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if (drm_firmware_drivers_only())
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return -ENODEV;
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ret = pci_register_driver(&hyperv_pci_driver);
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if (ret != 0)
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return ret;
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return vmbus_driver_register(&hyperv_hv_driver);
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}
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static void __exit hyperv_exit(void)
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{
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vmbus_driver_unregister(&hyperv_hv_driver);
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pci_unregister_driver(&hyperv_pci_driver);
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}
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module_init(hyperv_init);
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module_exit(hyperv_exit);
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MODULE_DEVICE_TABLE(pci, hyperv_pci_tbl);
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MODULE_DEVICE_TABLE(vmbus, hyperv_vmbus_tbl);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Deepak Rawat <drawat.floss@gmail.com>");
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MODULE_DESCRIPTION("DRM driver for Hyper-V synthetic video device");
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