drivers/gpu/drm/hyperv/hyperv_drm_drv.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2021 Microsoft
   4  */
   5
   6 #include <linux/efi.h>
   7 #include <linux/hyperv.h>
   8 #include <linux/module.h>
   9 #include <linux/pci.h>
  10
  11 #include <drm/drm_aperture.h>
  12 #include <drm/drm_atomic_helper.h>
  13 #include <drm/drm_drv.h>
  14 #include <drm/drm_fbdev_generic.h>
  15 #include <drm/drm_gem_shmem_helper.h>
  16 #include <drm/drm_simple_kms_helper.h>
  17
  18 #include "hyperv_drm.h"
  19
  20 #define DRIVER_NAME "hyperv_drm"
  21 #define DRIVER_DESC "DRM driver for Hyper-V synthetic video device"
  22 #define DRIVER_DATE "2020"
  23 #define DRIVER_MAJOR 1
  24 #define DRIVER_MINOR 0
  25
  26 DEFINE_DRM_GEM_FOPS(hv_fops);
  27
  28 static struct drm_driver hyperv_driver = {
  29         .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
  30
  31         .name            = DRIVER_NAME,
  32         .desc            = DRIVER_DESC,
  33         .date            = DRIVER_DATE,
  34         .major           = DRIVER_MAJOR,
  35         .minor           = DRIVER_MINOR,
  36
  37         .fops            = &hv_fops,
  38         DRM_GEM_SHMEM_DRIVER_OPS,
  39 };
  40
  41 static int hyperv_pci_probe(struct pci_dev *pdev,
  42                             const struct pci_device_id *ent)
  43 {
  44         return 0;
  45 }
  46
  47 static void hyperv_pci_remove(struct pci_dev *pdev)
  48 {
  49 }
  50
  51 static const struct pci_device_id hyperv_pci_tbl[] = {
  52         {
  53                 .vendor = PCI_VENDOR_ID_MICROSOFT,
  54                 .device = PCI_DEVICE_ID_HYPERV_VIDEO,
  55         },
  56         { /* end of list */ }
  57 };
  58
  59 /*
  60  * PCI stub to support gen1 VM.
  61  */
  62 static struct pci_driver hyperv_pci_driver = {
  63         .name =         KBUILD_MODNAME,
  64         .id_table =     hyperv_pci_tbl,
  65         .probe =        hyperv_pci_probe,
  66         .remove =       hyperv_pci_remove,
  67 };
  68
  69 static int hyperv_setup_vram(struct hyperv_drm_device *hv,
  70                              struct hv_device *hdev)
  71 {
  72         struct drm_device *dev = &hv->dev;
  73         int ret;
  74
  75         drm_aperture_remove_conflicting_framebuffers(screen_info.lfb_base,
  76                                                      screen_info.lfb_size,
  77                                                      &hyperv_driver);
  78
  79         hv->fb_size = (unsigned long)hv->mmio_megabytes * 1024 * 1024;
  80
  81         ret = vmbus_allocate_mmio(&hv->mem, hdev, 0, -1, hv->fb_size, 0x100000,
  82                                   true);
  83         if (ret) {
  84                 drm_err(dev, "Failed to allocate mmio\n");
  85                 return -ENOMEM;
  86         }
  87
  88         /*
  89          * Map the VRAM cacheable for performance. This is also required for VM
  90          * connect to display properly for ARM64 Linux VM, as the host also maps
  91          * the VRAM cacheable.
  92          */
  93         hv->vram = ioremap_cache(hv->mem->start, hv->fb_size);
  94         if (!hv->vram) {
  95                 drm_err(dev, "Failed to map vram\n");
  96                 ret = -ENOMEM;
  97                 goto error;
  98         }
  99
 100         hv->fb_base = hv->mem->start;
 101         return 0;
 102
 103 error:
 104         vmbus_free_mmio(hv->mem->start, hv->fb_size);
 105         return ret;
 106 }
 107
 108 static int hyperv_vmbus_probe(struct hv_device *hdev,
 109                               const struct hv_vmbus_device_id *dev_id)
 110 {
 111         struct hyperv_drm_device *hv;
 112         struct drm_device *dev;
 113         int ret;
 114
 115         hv = devm_drm_dev_alloc(&hdev->device, &hyperv_driver,
 116                                 struct hyperv_drm_device, dev);
 117         if (IS_ERR(hv))
 118                 return PTR_ERR(hv);
 119
 120         dev = &hv->dev;
 121         init_completion(&hv->wait);
 122         hv_set_drvdata(hdev, hv);
 123         hv->hdev = hdev;
 124
 125         ret = hyperv_connect_vsp(hdev);
 126         if (ret) {
 127                 drm_err(dev, "Failed to connect to vmbus.\n");
 128                 goto err_hv_set_drv_data;
 129         }
 130
 131         ret = hyperv_setup_vram(hv, hdev);
 132         if (ret)
 133                 goto err_vmbus_close;
 134
 135         /*
 136          * Should be done only once during init and resume. Failing to update
 137          * vram location is not fatal. Device will update dirty area till
 138          * preferred resolution only.
 139          */
 140         ret = hyperv_update_vram_location(hdev, hv->fb_base);
 141         if (ret)
 142                 drm_warn(dev, "Failed to update vram location.\n");
 143
 144         ret = hyperv_mode_config_init(hv);
 145         if (ret)
 146                 goto err_free_mmio;
 147
 148         ret = drm_dev_register(dev, 0);
 149         if (ret) {
 150                 drm_err(dev, "Failed to register drm driver.\n");
 151                 goto err_free_mmio;
 152         }
 153
 154         drm_fbdev_generic_setup(dev, 0);
 155
 156         return 0;
 157
 158 err_free_mmio:
 159         vmbus_free_mmio(hv->mem->start, hv->fb_size);
 160 err_vmbus_close:
 161         vmbus_close(hdev->channel);
 162 err_hv_set_drv_data:
 163         hv_set_drvdata(hdev, NULL);
 164         return ret;
 165 }
 166
 167 static void hyperv_vmbus_remove(struct hv_device *hdev)
 168 {
 169         struct drm_device *dev = hv_get_drvdata(hdev);
 170         struct hyperv_drm_device *hv = to_hv(dev);
 171
 172         drm_dev_unplug(dev);
 173         drm_atomic_helper_shutdown(dev);
 174         vmbus_close(hdev->channel);
 175         hv_set_drvdata(hdev, NULL);
 176
 177         vmbus_free_mmio(hv->mem->start, hv->fb_size);
 178 }
 179
 180 static int hyperv_vmbus_suspend(struct hv_device *hdev)
 181 {
 182         struct drm_device *dev = hv_get_drvdata(hdev);
 183         int ret;
 184
 185         ret = drm_mode_config_helper_suspend(dev);
 186         if (ret)
 187                 return ret;
 188
 189         vmbus_close(hdev->channel);
 190
 191         return 0;
 192 }
 193
 194 static int hyperv_vmbus_resume(struct hv_device *hdev)
 195 {
 196         struct drm_device *dev = hv_get_drvdata(hdev);
 197         struct hyperv_drm_device *hv = to_hv(dev);
 198         int ret;
 199
 200         ret = hyperv_connect_vsp(hdev);
 201         if (ret)
 202                 return ret;
 203
 204         ret = hyperv_update_vram_location(hdev, hv->fb_base);
 205         if (ret)
 206                 return ret;
 207
 208         return drm_mode_config_helper_resume(dev);
 209 }
 210
 211 static const struct hv_vmbus_device_id hyperv_vmbus_tbl[] = {
 212         /* Synthetic Video Device GUID */
 213         {HV_SYNTHVID_GUID},
 214         {}
 215 };
 216
 217 static struct hv_driver hyperv_hv_driver = {
 218         .name = KBUILD_MODNAME,
 219         .id_table = hyperv_vmbus_tbl,
 220         .probe = hyperv_vmbus_probe,
 221         .remove = hyperv_vmbus_remove,
 222         .suspend = hyperv_vmbus_suspend,
 223         .resume = hyperv_vmbus_resume,
 224         .driver = {
 225                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 226         },
 227 };
 228
 229 static int __init hyperv_init(void)
 230 {
 231         int ret;
 232
 233         if (drm_firmware_drivers_only())
 234                 return -ENODEV;
 235
 236         ret = pci_register_driver(&hyperv_pci_driver);
 237         if (ret != 0)
 238                 return ret;
 239
 240         return vmbus_driver_register(&hyperv_hv_driver);
 241 }
 242
 243 static void __exit hyperv_exit(void)
 244 {
 245         vmbus_driver_unregister(&hyperv_hv_driver);
 246         pci_unregister_driver(&hyperv_pci_driver);
 247 }
 248
 249 module_init(hyperv_init);
 250 module_exit(hyperv_exit);
 251
 252 MODULE_DEVICE_TABLE(pci, hyperv_pci_tbl);
 253 MODULE_DEVICE_TABLE(vmbus, hyperv_vmbus_tbl);
 254 MODULE_LICENSE("GPL");
 255 MODULE_AUTHOR("Deepak Rawat <[email protected]>");
 256 MODULE_DESCRIPTION("DRM driver for Hyper-V synthetic video device");