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@xxxxxxxxx>
Acked-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
---
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@xxxxxxxxx>");
+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;
+}
--
2.31.1
