[PATCH v3 1/2] drm/hyperv: Add DRM driver for hyperv synthetic video device
Deepak Rawat
drawat.floss at gmail.com
Wed Feb 17 16:01:09 UTC 2021
On Tue, 2021-02-16 at 09:21 +0100, Thomas Zimmermann wrote:
> Hi,
>
> fantastic. Thanks for sending an update. There's been a some bitrot
> meanwhile. Review below.
Thanks Thomas for the review. Will update as per review in next
iteration.
>
> Am 16.02.21 um 01:39 schrieb Deepak Rawat:
> > DRM driver for hyperv synthetic video device, based on hyperv_fb
> > framebuffer driver. Also added config option "DRM_HYPERV" to
> > enabled
> > this driver.
> >
> > v2:
> > - Add support for gen2 VM
> > - Fixed review comments
> >
> > v3:
> > - Split into multiple files as suggested by Thomas Zimmermann
> > - Fixed hibernation issue as suggested by Dexuan Cui
> > - Use ioremap_cache as suggested by Dexuan Cui
> > - Incorporated other review comments
> >
> > Signed-off-by: Deepak Rawat <drawat.floss at gmail.com>
> > ---
> > drivers/gpu/drm/Kconfig | 12 +
> > drivers/gpu/drm/Makefile | 1 +
> > drivers/gpu/drm/hyperv/Makefile | 8 +
> > drivers/gpu/drm/hyperv/hyperv_drm.h | 51 ++
> > drivers/gpu/drm/hyperv/hyperv_drm_drv.c | 313 +++++++++++++
> > drivers/gpu/drm/hyperv/hyperv_drm_modeset.c | 240 ++++++++++
> > drivers/gpu/drm/hyperv/hyperv_drm_proto.c | 486
> > ++++++++++++++++++++
> > 7 files changed, 1111 insertions(+)
> > create mode 100644 drivers/gpu/drm/hyperv/Makefile
> > create mode 100644 drivers/gpu/drm/hyperv/hyperv_drm.h
> > create mode 100644 drivers/gpu/drm/hyperv/hyperv_drm_drv.c
> > create mode 100644 drivers/gpu/drm/hyperv/hyperv_drm_modeset.c
> > create mode 100644 drivers/gpu/drm/hyperv/hyperv_drm_proto.c
> >
> > diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> > index 8bf103de1594..c17f4e9dcd82 100644
> > --- a/drivers/gpu/drm/Kconfig
> > +++ b/drivers/gpu/drm/Kconfig
> > @@ -382,6 +382,18 @@ source "drivers/gpu/drm/tidss/Kconfig"
> >
> > source "drivers/gpu/drm/xlnx/Kconfig"
> >
> > +config DRM_HYPERV
> > + tristate "DRM Support for hyperv synthetic video device"
> > + depends on DRM && PCI && MMU && HYPERV
> > + select DRM_KMS_HELPER
> > + select DRM_GEM_SHMEM_HELPER
> > + help
> > + This is a KMS driver for hyperv synthetic video device.
> > Choose this
> > + option if you would like to enable drm driver for Hyper-V
> > virtual
> > + machine.
> > +
> > + If M is selected the module will be called hyperv_drm.
> > +
> > # Keep legacy drivers last
> >
> > menuconfig DRM_LEGACY
> > diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> > index 926adef289db..294e321cd23f 100644
> > --- a/drivers/gpu/drm/Makefile
> > +++ b/drivers/gpu/drm/Makefile
> > @@ -125,3 +125,4 @@ obj-$(CONFIG_DRM_ASPEED_GFX) += aspeed/
> > obj-$(CONFIG_DRM_MCDE) += mcde/
> > obj-$(CONFIG_DRM_TIDSS) += tidss/
> > obj-y += xlnx/
> > +obj-$(CONFIG_DRM_HYPERV) += hyperv/
> > diff --git a/drivers/gpu/drm/hyperv/Makefile
> > b/drivers/gpu/drm/hyperv/Makefile
> > new file mode 100644
> > index 000000000000..0039b03db0be
> > --- /dev/null
> > +++ b/drivers/gpu/drm/hyperv/Makefile
> > @@ -0,0 +1,8 @@
> > +# SPDX-License-Identifier: GPL-2.0-only
> > +
> > +hyperv_drm-y := \
> > + hyperv_drm_proto.o \
> > + hyperv_drm_modeset.o \
> > + hyperv_drm_drv.o
> > +
> > +obj-$(CONFIG_DRM_HYPERV) += hyperv_drm.o
> > diff --git a/drivers/gpu/drm/hyperv/hyperv_drm.h
> > b/drivers/gpu/drm/hyperv/hyperv_drm.h
> > new file mode 100644
> > index 000000000000..4f8c627b303a
> > --- /dev/null
> > +++ b/drivers/gpu/drm/hyperv/hyperv_drm.h
> > @@ -0,0 +1,51 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright 2012-2021 Microsoft
> > + */
> > +
> > +#ifndef _HYPERV_DRM_H_
> > +#define _HYPERV_DRM_H_
> > +
> > +#define VMBUS_MAX_PACKET_SIZE 0x4000
> > +
> > +struct hyperv_drm_device {
> > + /* drm */
> > + struct drm_device dev;
> > + struct drm_simple_display_pipe pipe;
> > + struct drm_connector connector;
> > +
> > + /* mode */
> > + u32 screen_width_max;
> > + u32 screen_height_max;
> > + u32 preferred_width;
> > + u32 preferred_height;
> > + u32 screen_depth;
> > +
> > + /* hw */
> > + struct resource *mem;
> > + void __iomem *vram;
> > + unsigned long fb_base;
> > + unsigned long fb_size;
> > + struct completion wait;
> > + u32 synthvid_version;
> > + u32 mmio_megabytes;
> > +
> > + u8 init_buf[VMBUS_MAX_PACKET_SIZE];
> > + u8 recv_buf[VMBUS_MAX_PACKET_SIZE];
> > +
> > + struct hv_device *hdev;
> > +};
> > +
> > +#define to_hv(_dev) container_of(_dev, struct hyperv_drm_device,
> > dev)
> > +
> > +/* hyperv_drm_modeset */
> > +int hyperv_mode_config_init(struct hyperv_drm_device *hv);
> > +
> > +/* hyperv_drm_proto */
> > +int hyperv_update_vram_location(struct hv_device *hdev,
> > phys_addr_t vram_pp);
> > +int hyperv_update_situation(struct hv_device *hdev, u8 active, u32
> > bpp,
> > + u32 w, u32 h, u32 pitch);
> > +int hyperv_update_dirt(struct hv_device *hdev, struct drm_rect
> > *rect);
> > +int hyperv_connect_vsp(struct hv_device *hdev);
> > +
> > +#endif
> > diff --git a/drivers/gpu/drm/hyperv/hyperv_drm_drv.c
> > b/drivers/gpu/drm/hyperv/hyperv_drm_drv.c
> > new file mode 100644
> > index 000000000000..b72c1a169125
> > --- /dev/null
> > +++ b/drivers/gpu/drm/hyperv/hyperv_drm_drv.c
> > @@ -0,0 +1,313 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright 2012-2021 Microsoft
> > + */
> > +
> > +#include <linux/efi.h>
> > +#include <linux/hyperv.h>
> > +#include <linux/module.h>
> > +#include <linux/pci.h>
> > +
> > +#include <drm/drm_atomic_helper.h>
> > +#include <drm/drm_drv.h>
> > +#include <drm/drm_fb_helper.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 hyperv synthetic video device"
> > +#define DRIVER_DATE "2020"
> > +#define DRIVER_MAJOR 1
> > +#define DRIVER_MINOR 0
> > +
> > +#define PCI_VENDOR_ID_MICROSOFT 0x1414
> > +#define PCI_DEVICE_ID_HYPERV_VIDEO 0x5353
> > +
> > +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 */ }
> > +};
> > +
> > +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_get_vram_gen1(struct hyperv_drm_device *hv)
> > +{
> > + struct drm_device *dev = &hv->dev;
> > + struct pci_dev *pdev;
> > + int ret;
> > +
> > + pdev = pci_get_device(PCI_VENDOR_ID_MICROSOFT,
> > + PCI_DEVICE_ID_HYPERV_VIDEO, NULL);
> > + if (!pdev) {
> > + drm_err(dev, "Unable to find PCI Hyper-V video\n");
> > + return -ENODEV;
> > + }
> > +
> > + ret =
> > drm_fb_helper_remove_conflicting_pci_framebuffers(pdev,
> > "hypervdrmfb");
>
> This functon is not actually related to vram, but kicks out any
> drivers
> that might currently use the hardware. I'd try to do this outside of
> the vram mapping code. Anyway, your choice.
>
> > + if (ret) {
> > + drm_err(dev, "Not able to remove boot fb\n");
> > + return ret;
> > + }
> > +
> > + if (pci_request_region(pdev, 0, DRIVER_NAME) != 0)
> > + drm_warn(dev, "Cannot request framebuffer, boot fb
> > still active?\n");
> > +
> > + if ((pdev->resource[0].flags & IORESOURCE_MEM) == 0) {
> > + drm_err(dev, "Resource at bar 0 is not
> > IORESOURCE_MEM\n");
> > + ret = -ENODEV;
> > + goto error;
> > + }
> > +
> > + hv->fb_base = pci_resource_start(pdev, 0);
> > + hv->fb_size = pci_resource_len(pdev, 0);
> > + if (hv->fb_base == 0) {
>
> The prefered style is
>
> if (!hw->fb_base)
>
> > + drm_err(dev, "Resource not available\n");
> > + ret = -ENODEV;
> > + goto error;
> > + }
> > +
> > + hv->fb_size = min(hv->fb_size,
> > + (unsigned long)(hv->mmio_megabytes * 1024
> > * 1024));
> > + hv->vram = devm_ioremap(&pdev->dev, hv->fb_base, hv-
> > >fb_size);
> > + if (!hv->vram) {
> > + drm_err(dev, "Failed to map vram\n");
> > + ret = -ENOMEM;
> > + }
> > +
> > +error:
> > + pci_dev_put(pdev);
> > + return ret;
> > +}
> > +
> > +static int hyperv_get_vram_gen2(struct hyperv_drm_device *hv,
> > + struct hv_device *hdev)
> > +{
> > + struct drm_device *dev = &hv->dev;
> > + struct apertures_struct *ap;
> > + 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;
> > +
> > + ap = alloc_apertures(1);
> > + if (!ap) {
> > + drm_err(dev, "Failed to get apertures\n");
> > + ret = -ENOMEM;
> > + goto error;
> > + }
> > +
> > + ap->ranges[0].base = screen_info.lfb_base;
> > + ap->ranges[0].size = screen_info.lfb_size;
> > + remove_conflicting_framebuffers(ap, KBUILD_MODNAME, false);
>
> You have to use drm_fb_helper_remove_conflicting_framebuffers() here.
> remove_conflicting framebuffers() requires frambuffer support
> (CONFIG_FB). Not setting this option would break your driver's build.
>
> Also, I'd call this as early as possible. As I said, this removes
> other
> drivers. And you want to get rid of them as soon as possible to avoid
> interference.
>
> > + kfree(ap);
> > +
> > + 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;
> > +
> > + /* Get the actual VRAM size from the device */
> > + ret = hyperv_connect_vsp(hdev);
> > + if (ret) {
> > + drm_err(dev, "Failed to connect to vmbus.\n");
> > + goto err_hv_set_drv_data;
> > + }
> > +
> > + if (efi_enabled(EFI_BOOT))
> > + ret = hyperv_get_vram_gen2(hv, hdev);
> > + else
> > + ret = hyperv_get_vram_gen1(hv);
> > +
> > + 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_vmbus_close;
> > +
> > + ret = drm_dev_register(dev, 0);
> > + if (ret) {
> > + drm_err(dev, "Failed to register drm driver.\n");
> > + goto err_vmbus_close;
> > + }
> > +
> > + drm_fbdev_generic_setup(dev, 0);
> > +
> > + return 0;
> > +
> > +err_vmbus_close:
> > + vmbus_close(hdev->channel);
> > +err_hv_set_drv_data:
> > + hv_set_drvdata(hdev, NULL);
> > + return ret;
> > +}
> > +
> > +static int 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);
> > +
> > + return 0;
> > +}
> > +
> > +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);
> > +
> > + vmbus_close(hdev->channel);
> > +
> > + return ret;
> > +}
> > +
> > +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,
> > + .suspend = hyperv_vmbus_suspend,
> > + .resume = hyperv_vmbus_resume,
> > + .driver = {
> > + .probe_type = PROBE_PREFER_ASYNCHRONOUS,
> > + },
> > +};
> > +
> > +static int __init hyperv_init(void)
> > +{
> > + int ret;
> > +
> > + 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 <drawat.floss at gmail.com>");
> > +MODULE_DESCRIPTION("DRM driver for hyperv synthetic video
> > device");
> > diff --git a/drivers/gpu/drm/hyperv/hyperv_drm_modeset.c
> > b/drivers/gpu/drm/hyperv/hyperv_drm_modeset.c
> > new file mode 100644
> > index 000000000000..40ec0cff0e59
> > --- /dev/null
> > +++ b/drivers/gpu/drm/hyperv/hyperv_drm_modeset.c
> > @@ -0,0 +1,240 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright 2012-2021 Microsoft
> > + */
> > +
> > +#include <linux/hyperv.h>
> > +
> > +#include <drm/drm_damage_helper.h>
> > +#include <drm/drm_drv.h>
> > +#include <drm/drm_fb_helper.h>
> > +#include <drm/drm_format_helper.h>
> > +#include <drm/drm_fourcc.h>
> > +#include <drm/drm_gem_shmem_helper.h>
> > +#include <drm/drm_gem_framebuffer_helper.h>
> > +#include <drm/drm_probe_helper.h>
> > +#include <drm/drm_simple_kms_helper.h>
> > +
> > +#include "hyperv_drm.h"
> > +
> > +static int hyperv_blit_to_vram_rect(struct drm_framebuffer *fb,
> > + struct drm_rect *rect)
> > +{
> > + struct hyperv_drm_device *hv = to_hv(fb->dev);
> > + struct dma_buf_map map;
> > + void *vmap;
> > + int idx, ret;
> > +
> > + if (!drm_dev_enter(&hv->dev, &idx))
> > + return -ENODEV;
> > +
> > + ret = drm_gem_shmem_vmap(fb->obj[0], &map);
> > + if (ret) {
> > + drm_dev_exit(idx);
> > + return ret;
> > + }
>
> This code bitrotted. Calling vmap during the atomic scren update
> could
> lead to a deadlock. So it's not actually allowed. We got away with it
> so
> far, but I recently cleaned this up. Vmappings have to be
> established/removed in prepare_fb and cleanup_fb.
>
> But there's a helper to do that. drm_gem_atomic_helper.h contains
> plane-state functionality for shadow-buffered planes. It provies the
> mapping for your code. You won't have to do aynthing.
>
> It looks like you based your code on the cirrus driver? If so, have a
> look at
>
>
> https://lore.kernel.org/dri-devel/20210204200308.24216-5-tzimmermann@suse.de/
>
> so see hwo to convert to shadow-buffer helpers.
>
> > +
> > + vmap = map.vaddr;
> > + drm_fb_memcpy_dstclip(hv->vram, vmap, fb, rect);
> > + drm_gem_shmem_vunmap(fb->obj[0], vmap);
> > + drm_dev_exit(idx);
> > +
> > + return 0;
> > +}
> > +
> > +static int hyperv_blit_to_vram_fullscreen(struct drm_framebuffer
> > *fb)
> > +{
> > + struct drm_rect fullscreen = {
> > + .x1 = 0,
> > + .x2 = fb->width,
> > + .y1 = 0,
> > + .y2 = fb->height,
> > + };
> > + return hyperv_blit_to_vram_rect(fb, &fullscreen);
> > +}
> > +
> > +static int hyperv_connector_get_modes(struct drm_connector
> > *connector)
> > +{
> > + struct hyperv_drm_device *hv = to_hv(connector->dev);
> > + int count;
> > +
> > + count = drm_add_modes_noedid(connector,
> > + connector->dev-
> > >mode_config.max_width,
> > + connector->dev-
> > >mode_config.max_height);
> > + drm_set_preferred_mode(connector, hv->preferred_width,
> > + hv->preferred_height);
> > +
> > + return count;
> > +}
> > +
> > +static const struct drm_connector_helper_funcs
> > hyperv_connector_helper_funcs = {
> > + .get_modes = hyperv_connector_get_modes,
> > +};
> > +
> > +static const struct drm_connector_funcs hyperv_connector_funcs = {
> > + .fill_modes = drm_helper_probe_single_connector_modes,
> > + .destroy = drm_connector_cleanup,
> > + .reset = drm_atomic_helper_connector_reset,
> > + .atomic_duplicate_state =
> > drm_atomic_helper_connector_duplicate_state,
> > + .atomic_destroy_state =
> > drm_atomic_helper_connector_destroy_state,
> > +};
> > +
> > +static int hyperv_conn_init(struct hyperv_drm_device *hv)
> > +{
> > + drm_connector_helper_add(&hv->connector,
> > &hyperv_connector_helper_funcs);
> > + return drm_connector_init(&hv->dev, &hv->connector,
> > + &hyperv_connector_funcs,
> > + DRM_MODE_CONNECTOR_VGA);
> > +}
> > +
> > +static int hyperv_check_size(struct hyperv_drm_device *hv, int w,
> > int h,
> > + struct drm_framebuffer *fb)
> > +{
> > + u32 pitch = w * (hv->screen_depth / 8);
> > +
> > + if (fb)
> > + pitch = fb->pitches[0];
> > +
> > + if (pitch * h > hv->fb_size)
> > + return -EINVAL;
> > +
> > + return 0;
> > +}
> > +
> > +static void hyperv_pipe_enable(struct drm_simple_display_pipe
> > *pipe,
> > + struct drm_crtc_state *crtc_state,
> > + struct drm_plane_state *plane_state)
> > +{
> > + struct hyperv_drm_device *hv = to_hv(pipe->crtc.dev);
> > +
> > + hyperv_update_situation(hv->hdev, 1, hv->screen_depth,
> > + crtc_state->mode.hdisplay,
> > + crtc_state->mode.vdisplay,
> > + plane_state->fb->pitches[0]);
> > + hyperv_blit_to_vram_fullscreen(plane_state->fb);
> > +}
> > +
> > +static int hyperv_pipe_check(struct drm_simple_display_pipe *pipe,
> > + struct drm_plane_state *plane_state,
> > + struct drm_crtc_state *crtc_state)
> > +{
> > + struct hyperv_drm_device *hv = to_hv(pipe->crtc.dev);
> > + struct drm_framebuffer *fb = plane_state->fb;
> > +
> > + if (fb->format->format != DRM_FORMAT_XRGB8888)
> > + return -EINVAL;
> > +
> > + if (fb->pitches[0] * fb->height > hv->fb_size)
> > + return -EINVAL;
> > +
> > + return 0;
> > +}
> > +
> > +static void hyperv_pipe_update(struct drm_simple_display_pipe
> > *pipe,
> > + struct drm_plane_state *old_state)
> > +{
> > + struct hyperv_drm_device *hv = to_hv(pipe->crtc.dev);
> > + struct drm_plane_state *state = pipe->plane.state;
> > + struct drm_rect rect;
> > +
> > + if (drm_atomic_helper_damage_merged(old_state, state,
> > &rect)) {
> > + hyperv_blit_to_vram_rect(state->fb, &rect);
> > + hyperv_update_dirt(hv->hdev, &rect);
> > + }
> > +}
> > +
> > +static const struct drm_simple_display_pipe_funcs
> > hyperv_pipe_funcs = {
> > + .enable = hyperv_pipe_enable,
> > + .check = hyperv_pipe_check,
> > + .update = hyperv_pipe_update,
> > +};
> > +
> > +static const uint32_t hyperv_formats[] = {
> > + DRM_FORMAT_XRGB8888,
> > +};
> > +
> > +static const uint64_t hyperv_modifiers[] = {
> > + DRM_FORMAT_MOD_LINEAR,
> > + DRM_FORMAT_MOD_INVALID
> > +};
> > +
> > +static int hyperv_pipe_init(struct hyperv_drm_device *hv)
> > +{
> > + int ret;
> > +
> > + ret = drm_simple_display_pipe_init(&hv->dev,
> > + &hv->pipe,
> > + &hyperv_pipe_funcs,
> > + hyperv_formats,
> > +
> > ARRAY_SIZE(hyperv_formats),
> > + NULL,
> > + &hv->connector);
>
> Better return here if it fails.
>
> > +
> > + drm_plane_enable_fb_damage_clips(&hv->pipe.plane);
> > +
> > + return ret;
> > +}
> > +
> > +static struct drm_framebuffer*
> > +hyperv_fb_create(struct drm_device *dev, struct drm_file
> > *file_priv,
> > + const struct drm_mode_fb_cmd2 *mode_cmd)
> > +{
> > + return drm_gem_fb_create_with_dirty(dev, file_priv,
> > mode_cmd);
> > +}
> > +
> > +static enum drm_mode_status
> > +hyperv_mode_valid(struct drm_device *dev,
> > + const struct drm_display_mode *mode)
> > +{
> > + struct hyperv_drm_device *hv = to_hv(dev);
> > +
> > + if (hyperv_check_size(hv, mode->hdisplay, mode->vdisplay,
> > NULL))
> > + return MODE_BAD;
> > +
> > + return MODE_OK;
> > +}
> > +
> > +static const struct drm_mode_config_funcs hyperv_mode_config_funcs
> > = {
> > + .fb_create = hyperv_fb_create,
> > + .mode_valid = hyperv_mode_valid,
> > + .atomic_check = drm_atomic_helper_check,
> > + .atomic_commit = drm_atomic_helper_commit,
> > +};
> > +
> > +int hyperv_mode_config_init(struct hyperv_drm_device *hv)
> > +{
> > + struct drm_device *dev = &hv->dev;
> > + int ret;
> > +
> > + ret = drmm_mode_config_init(dev);
> > + if (ret) {
> > + drm_err(dev, "Failed to initialized mode
> > setting.\n");
> > + return ret;
> > + }
> > +
> > + dev->mode_config.min_width = 0;
> > + dev->mode_config.min_height = 0;
> > + dev->mode_config.max_width = hv->screen_width_max;
> > + dev->mode_config.max_height = hv->screen_height_max;
> > +
> > + dev->mode_config.preferred_depth = hv->screen_depth;
> > + dev->mode_config.prefer_shadow = 0;
> > +
> > + dev->mode_config.funcs = &hyperv_mode_config_funcs;
> > +
> > + ret = hyperv_conn_init(hv);
> > + if (ret) {
> > + drm_err(dev, "Failed to initialized connector.\n");
> > + return ret;
> > + }
> > +
> > + ret = hyperv_pipe_init(hv);
> > + if (ret) {
> > + drm_err(dev, "Failed to initialized pipe.\n");
> > + return ret;
> > + }
>
> Maybe just inline _conn_init() and _pipe_init(). These functions
> don't
> seem to provide much.
>
> Best regards
> Thomas
>
> > +
> > + drm_mode_config_reset(dev);
> > +
> > + return 0;
> > +}
> > diff --git a/drivers/gpu/drm/hyperv/hyperv_drm_proto.c
> > b/drivers/gpu/drm/hyperv/hyperv_drm_proto.c
> > new file mode 100644
> > index 000000000000..4e61992be121
> > --- /dev/null
> > +++ b/drivers/gpu/drm/hyperv/hyperv_drm_proto.c
> > @@ -0,0 +1,486 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright 2012-2021 Microsoft
> > + */
> > +
> > +#include <linux/hyperv.h>
> > +
> > +#include <drm/drm_print.h>
> > +#include <drm/drm_simple_kms_helper.h>
> > +
> > +#include "hyperv_drm.h"
> > +
> > +#define VMBUS_RING_BUFSIZE (256 * 1024)
> > +#define VMBUS_VSP_TIMEOUT (10 * HZ)
> > +
> > +#define SYNTHVID_VERSION(major, minor) ((minor) << 16 | (major))
> > +#define SYNTHVID_VER_GET_MAJOR(ver) (ver & 0x0000ffff)
> > +#define SYNTHVID_VER_GET_MINOR(ver) ((ver & 0xffff0000) >> 16)
> > +#define SYNTHVID_VERSION_WIN7 SYNTHVID_VERSION(3, 0)
> > +#define SYNTHVID_VERSION_WIN8 SYNTHVID_VERSION(3, 2)
> > +#define SYNTHVID_VERSION_WIN10 SYNTHVID_VERSION(3, 5)
> > +
> > +#define SYNTHVID_DEPTH_WIN7 16
> > +#define SYNTHVID_DEPTH_WIN8 32
> > +#define SYNTHVID_FB_SIZE_WIN7 (4 * 1024 * 1024)
> > +#define SYNTHVID_FB_SIZE_WIN8 (8 * 1024 * 1024)
> > +#define SYNTHVID_WIDTH_MAX_WIN7 1600
> > +#define SYNTHVID_HEIGHT_MAX_WIN7 1200
> > +
> > +enum pipe_msg_type {
> > + PIPE_MSG_INVALID,
> > + PIPE_MSG_DATA,
> > + PIPE_MSG_MAX
> > +};
> > +
> > +enum synthvid_msg_type {
> > + SYNTHVID_ERROR = 0,
> > + SYNTHVID_VERSION_REQUEST = 1,
> > + SYNTHVID_VERSION_RESPONSE = 2,
> > + SYNTHVID_VRAM_LOCATION = 3,
> > + SYNTHVID_VRAM_LOCATION_ACK = 4,
> > + SYNTHVID_SITUATION_UPDATE = 5,
> > + SYNTHVID_SITUATION_UPDATE_ACK = 6,
> > + SYNTHVID_POINTER_POSITION = 7,
> > + SYNTHVID_POINTER_SHAPE = 8,
> > + SYNTHVID_FEATURE_CHANGE = 9,
> > + SYNTHVID_DIRT = 10,
> > + SYNTHVID_RESOLUTION_REQUEST = 13,
> > + SYNTHVID_RESOLUTION_RESPONSE = 14,
> > +
> > + SYNTHVID_MAX = 15
> > +};
> > +
> > +struct pipe_msg_hdr {
> > + u32 type;
> > + u32 size; /* size of message after this field */
> > +} __packed;
> > +
> > +struct hvd_screen_info {
> > + u16 width;
> > + u16 height;
> > +} __packed;
> > +
> > +struct synthvid_msg_hdr {
> > + u32 type;
> > + u32 size; /* size of this header + payload after this
> > field */
> > +} __packed;
> > +
> > +struct synthvid_version_req {
> > + u32 version;
> > +} __packed;
> > +
> > +struct synthvid_version_resp {
> > + u32 version;
> > + u8 is_accepted;
> > + u8 max_video_outputs;
> > +} __packed;
> > +
> > +struct synthvid_vram_location {
> > + u64 user_ctx;
> > + u8 is_vram_gpa_specified;
> > + u64 vram_gpa;
> > +} __packed;
> > +
> > +struct synthvid_vram_location_ack {
> > + u64 user_ctx;
> > +} __packed;
> > +
> > +struct video_output_situation {
> > + u8 active;
> > + u32 vram_offset;
> > + u8 depth_bits;
> > + u32 width_pixels;
> > + u32 height_pixels;
> > + u32 pitch_bytes;
> > +} __packed;
> > +
> > +struct synthvid_situation_update {
> > + u64 user_ctx;
> > + u8 video_output_count;
> > + struct video_output_situation video_output[1];
> > +} __packed;
> > +
> > +struct synthvid_situation_update_ack {
> > + u64 user_ctx;
> > +} __packed;
> > +
> > +struct synthvid_pointer_position {
> > + u8 is_visible;
> > + u8 video_output;
> > + s32 image_x;
> > + s32 image_y;
> > +} __packed;
> > +
> > +#define SYNTHVID_CURSOR_MAX_X 96
> > +#define SYNTHVID_CURSOR_MAX_Y 96
> > +#define SYNTHVID_CURSOR_ARGB_PIXEL_SIZE 4
> > +#define SYNTHVID_CURSOR_MAX_SIZE (SYNTHVID_CURSOR_MAX_X * \
> > + SYNTHVID_CURSOR_MAX_Y * SYNTHVID_CURSOR_ARGB_PIXEL_SIZE)
> > +#define SYNTHVID_CURSOR_COMPLETE (-1)
> > +
> > +struct synthvid_pointer_shape {
> > + u8 part_idx;
> > + u8 is_argb;
> > + u32 width; /* SYNTHVID_CURSOR_MAX_X at most */
> > + u32 height; /* SYNTHVID_CURSOR_MAX_Y at most */
> > + u32 hot_x; /* hotspot relative to upper-left of pointer
> > image */
> > + u32 hot_y;
> > + u8 data[4];
> > +} __packed;
> > +
> > +struct synthvid_feature_change {
> > + u8 is_dirt_needed;
> > + u8 is_ptr_pos_needed;
> > + u8 is_ptr_shape_needed;
> > + u8 is_situ_needed;
> > +} __packed;
> > +
> > +struct rect {
> > + s32 x1, y1; /* top left corner */
> > + s32 x2, y2; /* bottom right corner, exclusive */
> > +} __packed;
> > +
> > +struct synthvid_dirt {
> > + u8 video_output;
> > + u8 dirt_count;
> > + struct rect rect[1];
> > +} __packed;
> > +
> > +#define SYNTHVID_EDID_BLOCK_SIZE 128
> > +#define SYNTHVID_MAX_RESOLUTION_COUNT 64
> > +
> > +struct synthvid_supported_resolution_req {
> > + u8 maximum_resolution_count;
> > +} __packed;
> > +
> > +struct synthvid_supported_resolution_resp {
> > + u8 edid_block[SYNTHVID_EDID_BLOCK_SIZE];
> > + u8 resolution_count;
> > + u8 default_resolution_index;
> > + u8 is_standard;
> > + struct hvd_screen_info
> > supported_resolution[SYNTHVID_MAX_RESOLUTION_COUNT];
> > +} __packed;
> > +
> > +struct synthvid_msg {
> > + struct pipe_msg_hdr pipe_hdr;
> > + struct synthvid_msg_hdr vid_hdr;
> > + union {
> > + struct synthvid_version_req ver_req;
> > + struct synthvid_version_resp ver_resp;
> > + struct synthvid_vram_location vram;
> > + struct synthvid_vram_location_ack vram_ack;
> > + struct synthvid_situation_update situ;
> > + struct synthvid_situation_update_ack situ_ack;
> > + struct synthvid_pointer_position ptr_pos;
> > + struct synthvid_pointer_shape ptr_shape;
> > + struct synthvid_feature_change feature_chg;
> > + struct synthvid_dirt dirt;
> > + struct synthvid_supported_resolution_req
> > resolution_req;
> > + struct synthvid_supported_resolution_resp
> > resolution_resp;
> > + };
> > +} __packed;
> > +
> > +static inline bool hyperv_version_ge(u32 ver1, u32 ver2)
> > +{
> > + if (SYNTHVID_VER_GET_MAJOR(ver1) >
> > SYNTHVID_VER_GET_MAJOR(ver2) ||
> > + (SYNTHVID_VER_GET_MAJOR(ver1) ==
> > SYNTHVID_VER_GET_MAJOR(ver2) &&
> > + SYNTHVID_VER_GET_MINOR(ver1) >=
> > SYNTHVID_VER_GET_MINOR(ver2)))
> > + return true;
> > +
> > + return false;
> > +}
> > +
> > +static inline int hyperv_sendpacket(struct hv_device *hdev, struct
> > synthvid_msg *msg)
> > +{
> > + static atomic64_t request_id = ATOMIC64_INIT(0);
> > + struct hyperv_drm_device *hv = hv_get_drvdata(hdev);
> > + int ret;
> > +
> > + msg->pipe_hdr.type = PIPE_MSG_DATA;
> > + msg->pipe_hdr.size = msg->vid_hdr.size;
> > +
> > + ret = vmbus_sendpacket(hdev->channel, msg,
> > + msg->vid_hdr.size + sizeof(struct
> > pipe_msg_hdr),
> > + atomic64_inc_return(&request_id),
> > + VM_PKT_DATA_INBAND, 0);
> > +
> > + if (ret)
> > + drm_err(&hv->dev, "Unable to send packet via
> > vmbus\n");
> > +
> > + return ret;
> > +}
> > +
> > +static int hyperv_negotiate_version(struct hv_device *hdev, u32
> > ver)
> > +{
> > + struct hyperv_drm_device *hv = hv_get_drvdata(hdev);
> > + struct synthvid_msg *msg = (struct synthvid_msg *)hv-
> > >init_buf;
> > + struct drm_device *dev = &hv->dev;
> > + unsigned long t;
> > + int ret = 0;
> > +
> > + memset(msg, 0, sizeof(struct synthvid_msg));
> > + msg->vid_hdr.type = SYNTHVID_VERSION_REQUEST;
> > + msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
> > + sizeof(struct synthvid_version_req);
> > + msg->ver_req.version = ver;
> > + hyperv_sendpacket(hdev, msg);
> > +
> > + t = wait_for_completion_timeout(&hv->wait,
> > VMBUS_VSP_TIMEOUT);
> > + if (!t) {
> > + drm_err(dev, "Time out on waiting version
> > response\n");
> > + ret = -ETIMEDOUT;
> > + goto out;
> > + }
> > + if (!msg->ver_resp.is_accepted) {
> > + ret = -ENODEV;
> > + goto out;
> > + }
> > +
> > + hv->synthvid_version = ver;
> > + drm_info(dev, "Synthvid Version major %d, minor %d\n",
> > + SYNTHVID_VER_GET_MAJOR(ver),
> > SYNTHVID_VER_GET_MINOR(ver));
> > +
> > +out:
> > + return ret;
> > +}
> > +
> > +int hyperv_update_vram_location(struct hv_device *hdev,
> > phys_addr_t vram_pp)
> > +{
> > + struct hyperv_drm_device *hv = hv_get_drvdata(hdev);
> > + struct synthvid_msg *msg = (struct synthvid_msg *)hv-
> > >init_buf;
> > + struct drm_device *dev = &hv->dev;
> > + unsigned long t;
> > + int ret = 0;
> > +
> > + memset(msg, 0, sizeof(struct synthvid_msg));
> > + msg->vid_hdr.type = SYNTHVID_VRAM_LOCATION;
> > + msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
> > + sizeof(struct synthvid_vram_location);
> > + msg->vram.user_ctx = vram_pp;
> > + msg->vram.vram_gpa = vram_pp;
> > + msg->vram.is_vram_gpa_specified = 1;
> > + hyperv_sendpacket(hdev, msg);
> > +
> > + t = wait_for_completion_timeout(&hv->wait,
> > VMBUS_VSP_TIMEOUT);
> > + if (!t) {
> > + drm_err(dev, "Time out on waiting vram location
> > ack\n");
> > + ret = -ETIMEDOUT;
> > + goto out;
> > + }
> > + if (msg->vram_ack.user_ctx != vram_pp) {
> > + drm_err(dev, "Unable to set VRAM location\n");
> > + ret = -ENODEV;
> > + }
> > +
> > +out:
> > + return ret;
> > +}
> > +
> > +int hyperv_update_situation(struct hv_device *hdev, u8 active, u32
> > bpp,
> > + u32 w, u32 h, u32 pitch)
> > +{
> > + struct synthvid_msg msg;
> > +
> > + memset(&msg, 0, sizeof(struct synthvid_msg));
> > +
> > + msg.vid_hdr.type = SYNTHVID_SITUATION_UPDATE;
> > + msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
> > + sizeof(struct synthvid_situation_update);
> > + msg.situ.user_ctx = 0;
> > + msg.situ.video_output_count = 1;
> > + msg.situ.video_output[0].active = active;
> > + /* vram_offset should always be 0 */
> > + msg.situ.video_output[0].vram_offset = 0;
> > + msg.situ.video_output[0].depth_bits = bpp;
> > + msg.situ.video_output[0].width_pixels = w;
> > + msg.situ.video_output[0].height_pixels = h;
> > + msg.situ.video_output[0].pitch_bytes = pitch;
> > +
> > + hyperv_sendpacket(hdev, &msg);
> > +
> > + return 0;
> > +}
> > +
> > +int hyperv_update_dirt(struct hv_device *hdev, struct drm_rect
> > *rect)
> > +{
> > + struct synthvid_msg msg;
> > +
> > + memset(&msg, 0, sizeof(struct synthvid_msg));
> > +
> > + msg.vid_hdr.type = SYNTHVID_DIRT;
> > + msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
> > + sizeof(struct synthvid_dirt);
> > + msg.dirt.video_output = 0;
> > + msg.dirt.dirt_count = 1;
> > + msg.dirt.rect[0].x1 = rect->x1;
> > + msg.dirt.rect[0].y1 = rect->y1;
> > + msg.dirt.rect[0].x2 = rect->x2;
> > + msg.dirt.rect[0].y2 = rect->y2;
> > +
> > + hyperv_sendpacket(hdev, &msg);
> > +
> > + return 0;
> > +}
> > +
> > +static int hyperv_get_supported_resolution(struct hv_device *hdev)
> > +{
> > + struct hyperv_drm_device *hv = hv_get_drvdata(hdev);
> > + struct synthvid_msg *msg = (struct synthvid_msg *)hv-
> > >init_buf;
> > + struct drm_device *dev = &hv->dev;
> > + unsigned long t;
> > + int ret = 0;
> > + u8 index;
> > + int i;
> > +
> > + memset(msg, 0, sizeof(struct synthvid_msg));
> > + msg->vid_hdr.type = SYNTHVID_RESOLUTION_REQUEST;
> > + msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
> > + sizeof(struct synthvid_supported_resolution_req);
> > + msg->resolution_req.maximum_resolution_count =
> > + SYNTHVID_MAX_RESOLUTION_COUNT;
> > + hyperv_sendpacket(hdev, msg);
> > +
> > + t = wait_for_completion_timeout(&hv->wait,
> > VMBUS_VSP_TIMEOUT);
> > + if (!t) {
> > + drm_err(dev, "Time out on waiting resolution
> > response\n");
> > + ret = -ETIMEDOUT;
> > + goto out;
> > + }
> > +
> > + if (msg->resolution_resp.resolution_count == 0) {
> > + drm_err(dev, "No supported resolutions\n");
> > + ret = -ENODEV;
> > + goto out;
> > + }
> > +
> > + index = msg->resolution_resp.default_resolution_index;
> > + if (index >= msg->resolution_resp.resolution_count) {
> > + drm_err(dev, "Invalid resolution index: %d\n",
> > index);
> > + ret = -ENODEV;
> > + goto out;
> > + }
> > +
> > + for (i = 0; i < msg->resolution_resp.resolution_count; i++)
> > {
> > + hv->screen_width_max = max_t(u32, hv-
> > >screen_width_max,
> > + msg-
> > >resolution_resp.supported_resolution[i].width);
> > + hv->screen_height_max = max_t(u32, hv-
> > >screen_height_max,
> > + msg-
> > >resolution_resp.supported_resolution[i].height);
> > + }
> > +
> > + hv->preferred_width =
> > + msg-
> > >resolution_resp.supported_resolution[index].width;
> > + hv->preferred_height =
> > + msg-
> > >resolution_resp.supported_resolution[index].height;
> > +
> > +out:
> > + return ret;
> > +}
> > +
> > +static void hyperv_receive_sub(struct hv_device *hdev)
> > +{
> > + struct hyperv_drm_device *hv = hv_get_drvdata(hdev);
> > + struct synthvid_msg *msg;
> > +
> > + if (!hv)
> > + return;
> > +
> > + msg = (struct synthvid_msg *)hv->recv_buf;
> > +
> > + /* Complete the wait event */
> > + if (msg->vid_hdr.type == SYNTHVID_VERSION_RESPONSE ||
> > + msg->vid_hdr.type == SYNTHVID_RESOLUTION_RESPONSE ||
> > + msg->vid_hdr.type == SYNTHVID_VRAM_LOCATION_ACK) {
> > + memcpy(hv->init_buf, msg, VMBUS_MAX_PACKET_SIZE);
> > + complete(&hv->wait);
> > + return;
> > + }
> > +}
> > +
> > +static void hyperv_receive(void *ctx)
> > +{
> > + struct hv_device *hdev = ctx;
> > + struct hyperv_drm_device *hv = hv_get_drvdata(hdev);
> > + struct synthvid_msg *recv_buf;
> > + u32 bytes_recvd;
> > + u64 req_id;
> > + int ret;
> > +
> > + if (!hv)
> > + return;
> > +
> > + recv_buf = (struct synthvid_msg *)hv->recv_buf;
> > +
> > + do {
> > + ret = vmbus_recvpacket(hdev->channel, recv_buf,
> > + VMBUS_MAX_PACKET_SIZE,
> > + &bytes_recvd, &req_id);
> > + if (bytes_recvd > 0 &&
> > + recv_buf->pipe_hdr.type == PIPE_MSG_DATA)
> > + hyperv_receive_sub(hdev);
> > + } while (bytes_recvd > 0 && ret == 0);
> > +}
> > +
> > +int hyperv_connect_vsp(struct hv_device *hdev)
> > +{
> > + struct hyperv_drm_device *hv = hv_get_drvdata(hdev);
> > + struct drm_device *dev = &hv->dev;
> > + int ret;
> > +
> > + ret = vmbus_open(hdev->channel, VMBUS_RING_BUFSIZE,
> > VMBUS_RING_BUFSIZE,
> > + NULL, 0, hyperv_receive, hdev);
> > + if (ret) {
> > + drm_err(dev, "Unable to open vmbus channel\n");
> > + return ret;
> > + }
> > +
> > + /* Negotiate the protocol version with host */
> > + switch (vmbus_proto_version) {
> > + case VERSION_WIN10:
> > + case VERSION_WIN10_V5:
> > + ret = hyperv_negotiate_version(hdev,
> > SYNTHVID_VERSION_WIN10);
> > + if (!ret)
> > + break;
> > + fallthrough;
> > + case VERSION_WIN8:
> > + case VERSION_WIN8_1:
> > + ret = hyperv_negotiate_version(hdev,
> > SYNTHVID_VERSION_WIN8);
> > + if (!ret)
> > + break;
> > + fallthrough;
> > + case VERSION_WS2008:
> > + case VERSION_WIN7:
> > + ret = hyperv_negotiate_version(hdev,
> > SYNTHVID_VERSION_WIN7);
> > + break;
> > + default:
> > + ret = hyperv_negotiate_version(hdev,
> > SYNTHVID_VERSION_WIN10);
> > + break;
> > + }
> > +
> > + if (ret) {
> > + drm_err(dev, "Synthetic video device version not
> > accepted %d\n", ret);
> > + goto error;
> > + }
> > +
> > + if (hv->synthvid_version == SYNTHVID_VERSION_WIN7)
> > + hv->screen_depth = SYNTHVID_DEPTH_WIN7;
> > + else
> > + hv->screen_depth = SYNTHVID_DEPTH_WIN8;
> > +
> > + if (hyperv_version_ge(hv->synthvid_version,
> > SYNTHVID_VERSION_WIN10)) {
> > + ret = hyperv_get_supported_resolution(hdev);
> > + if (ret)
> > + drm_err(dev, "Failed to get supported
> > resolution from host, use default\n");
> > + } else {
> > + hv->screen_width_max = SYNTHVID_WIDTH_MAX_WIN7;
> > + hv->screen_height_max = SYNTHVID_HEIGHT_MAX_WIN7;
> > + }
> > +
> > + hv->mmio_megabytes = hdev->channel-
> > >offermsg.offer.mmio_megabytes;
> > +
> > + return 0;
> > +
> > +error:
> > + vmbus_close(hdev->channel);
> > + return ret;
> > +}
> >
>
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