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

v4: - Fix bitrotted code - Review comments - Updated the copyright and license to match hyperv_fb

v5: - Address review comments and rebased with drm-misc-next

Signed-off-by: Deepak Rawat drawat.floss@gmail.com Acked-by: Thomas Zimmermann tzimmermann@suse.de --- 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 | 307 +++++++++++++ drivers/gpu/drm/hyperv/hyperv_drm_modeset.c | 231 ++++++++++ drivers/gpu/drm/hyperv/hyperv_drm_proto.c | 478 ++++++++++++++++++++ 7 files changed, 1088 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 d3a9ca4b1cec..9d0ea894ba70 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -380,6 +380,18 @@ source "drivers/gpu/drm/xlnx/Kconfig"

source "drivers/gpu/drm/gud/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 a91cc7684904..a118692a6df7 100644 --- a/drivers/gpu/drm/Makefile +++ b/drivers/gpu/drm/Makefile @@ -126,3 +126,4 @@ obj-$(CONFIG_DRM_MCDE) += mcde/ obj-$(CONFIG_DRM_TIDSS) += tidss/ obj-y += xlnx/ obj-y += gud/ +obj-$(CONFIG_DRM_HYPERV) += hyperv/ diff --git a/drivers/gpu/drm/hyperv/Makefile b/drivers/gpu/drm/hyperv/Makefile new file mode 100644 index 000000000000..265f12f2c660 --- /dev/null +++ b/drivers/gpu/drm/hyperv/Makefile @@ -0,0 +1,8 @@ +# SPDX-License-Identifier: GPL-2.0-only + +hyperv_drm-y := \ + hyperv_drm_drv.o \ + hyperv_drm_modeset.o \ + hyperv_drm_proto.o + +obj-$(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..e1d1fdea96f2 --- /dev/null +++ b/drivers/gpu/drm/hyperv/hyperv_drm.h @@ -0,0 +1,51 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright 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..c346dc7544aa --- /dev/null +++ b/drivers/gpu/drm/hyperv/hyperv_drm_drv.c @@ -0,0 +1,307 @@ +// 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_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 */ } +}; + +/* + * 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_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_aperture_remove_conflicting_pci_framebuffers(pdev, "hypervdrmfb"); + 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) { + 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_setup_gen2(struct hyperv_drm_device *hv, + struct hv_device *hdev) +{ + struct drm_device *dev = &hv->dev; + int ret; + + drm_aperture_remove_conflicting_framebuffers(screen_info.lfb_base, + screen_info.lfb_size, + false, + "hypervdrmfb"); + + 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; + } + + if (efi_enabled(EFI_BOOT)) + ret = hyperv_setup_gen2(hv, hdev); + else + ret = hyperv_setup_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@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..02718e3e859e --- /dev/null +++ b/drivers/gpu/drm/hyperv/hyperv_drm_modeset.c @@ -0,0 +1,231 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright 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_atomic_helper.h> +#include <drm/drm_gem_framebuffer_helper.h> +#include <drm/drm_gem_shmem_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, + const struct dma_buf_map *map, + struct drm_rect *rect) +{ + struct hyperv_drm_device *hv = to_hv(fb->dev); + void *vmap = map->vaddr; /* TODO: Use mapping abstraction properly */ + int idx; + + if (!drm_dev_enter(&hv->dev, &idx)) + return -ENODEV; + + drm_fb_memcpy_dstclip(hv->vram, fb->pitches[0], vmap, fb, rect); + drm_dev_exit(idx); + + return 0; +} + +static int hyperv_blit_to_vram_fullscreen(struct drm_framebuffer *fb, const struct dma_buf_map *map) +{ + struct drm_rect fullscreen = { + .x1 = 0, + .x2 = fb->width, + .y1 = 0, + .y2 = fb->height, + }; + return hyperv_blit_to_vram_rect(fb, map, &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 inline 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_VIRTUAL); +} + +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); + struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state); + + 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, &shadow_plane_state->map[0]); +} + +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_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(state); + struct drm_rect rect; + + if (drm_atomic_helper_damage_merged(old_state, state, &rect)) { + hyperv_blit_to_vram_rect(state->fb, &shadow_plane_state->map[0], &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, + DRM_GEM_SIMPLE_DISPLAY_PIPE_SHADOW_PLANE_FUNCS, +}; + +static const uint32_t hyperv_formats[] = { + DRM_FORMAT_XRGB8888, +}; + +static const uint64_t hyperv_modifiers[] = { + DRM_FORMAT_MOD_LINEAR, + DRM_FORMAT_MOD_INVALID +}; + +static inline 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); + if (ret) + return ret; + + drm_plane_enable_fb_damage_clips(&hv->pipe.plane); + + return 0; +} + +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 = drm_gem_fb_create_with_dirty, + .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; + } + + 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..700870b243fe --- /dev/null +++ b/drivers/gpu/drm/hyperv/hyperv_drm_proto.c @@ -0,0 +1,478 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright 2021 Microsoft + * + * Portions of this code derived from hyperv_fb.c + */ + +#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; + + 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"); + return -ETIMEDOUT; + } + + if (!msg->ver_resp.is_accepted) { + drm_err(dev, "Version request not accepted\n"); + return -ENODEV; + } + + hv->synthvid_version = ver; + drm_info(dev, "Synthvid Version major %d, minor %d\n", + SYNTHVID_VER_GET_MAJOR(ver), SYNTHVID_VER_GET_MINOR(ver)); + + return 0; +} + +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; + + 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"); + return -ETIMEDOUT; + } + if (msg->vram_ack.user_ctx != vram_pp) { + drm_err(dev, "Unable to set VRAM location\n"); + return -ENODEV; + } + + return 0; +} + +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; + 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"); + return -ETIMEDOUT; + } + + if (msg->resolution_resp.resolution_count == 0) { + drm_err(dev, "No supported resolutions\n"); + return -ENODEV; + } + + index = msg->resolution_resp.default_resolution_index; + if (index >= msg->resolution_resp.resolution_count) { + drm_err(dev, "Invalid resolution index: %d\n", index); + return -ENODEV; + } + + 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; + + return 0; +} + +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; +}