DRM driver for hyperv synthetic video device, based on hyperv_fb framebuffer driver. Also added config option "DRM_HYPERV" to enabled this driver.
Signed-off-by: Deepak Rawat drawat.floss@gmail.com --- drivers/gpu/drm/tiny/Kconfig | 9 + drivers/gpu/drm/tiny/Makefile | 1 + drivers/gpu/drm/tiny/hyperv_drm.c | 1007 +++++++++++++++++++++++++++++ 3 files changed, 1017 insertions(+) create mode 100644 drivers/gpu/drm/tiny/hyperv_drm.c
diff --git a/drivers/gpu/drm/tiny/Kconfig b/drivers/gpu/drm/tiny/Kconfig index 2b6414f0fa75..e6d53e60a9c2 100644 --- a/drivers/gpu/drm/tiny/Kconfig +++ b/drivers/gpu/drm/tiny/Kconfig @@ -28,6 +28,15 @@ config DRM_GM12U320 This is a KMS driver for projectors which use the GM12U320 chipset for video transfer over USB2/3, such as the Acer C120 mini projector.
+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 for hyperv synthetic video device. + If M is selected the module will be called hyperv_drm. + config TINYDRM_HX8357D tristate "DRM support for HX8357D display panels" depends on DRM && SPI diff --git a/drivers/gpu/drm/tiny/Makefile b/drivers/gpu/drm/tiny/Makefile index 6ae4e9e5a35f..837cb2c2637e 100644 --- a/drivers/gpu/drm/tiny/Makefile +++ b/drivers/gpu/drm/tiny/Makefile @@ -2,6 +2,7 @@
obj-$(CONFIG_DRM_CIRRUS_QEMU) += cirrus.o obj-$(CONFIG_DRM_GM12U320) += gm12u320.o +obj-$(CONFIG_DRM_HYPERV) += hyperv_drm.o obj-$(CONFIG_TINYDRM_HX8357D) += hx8357d.o obj-$(CONFIG_TINYDRM_ILI9225) += ili9225.o obj-$(CONFIG_TINYDRM_ILI9341) += ili9341.o diff --git a/drivers/gpu/drm/tiny/hyperv_drm.c b/drivers/gpu/drm/tiny/hyperv_drm.c new file mode 100644 index 000000000000..3d020586056e --- /dev/null +++ b/drivers/gpu/drm/tiny/hyperv_drm.c @@ -0,0 +1,1007 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2012-2020 Microsoft + * + * Authors: + * Deepak Rawat drawat.floss@gmail.com + * + * Portions of this code is derived from hyperv_fb.c + * drivers/video/fbdev/hyperv_fb.c - framebuffer driver for hyperv synthetic + * video device. + * + */ + +#include <linux/console.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/hyperv.h> + +#include <drm/drm_atomic_helper.h> +#include <drm/drm_atomic_state_helper.h> +#include <drm/drm_connector.h> +#include <drm/drm_damage_helper.h> +#include <drm/drm_drv.h> +#include <drm/drm_fb_helper.h> +#include <drm/drm_file.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_ioctl.h> +#include <drm/drm_managed.h> +#include <drm/drm_modeset_helper_vtables.h> +#include <drm/drm_probe_helper.h> +#include <drm/drm_simple_kms_helper.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 VMBUS_MAX_PACKET_SIZE 0x4000 +#define VMBUS_RING_BUFSIZE (256 * 1024) +#define VMBUS_VSP_TIMEOUT (10 * HZ) + +#define PCI_VENDOR_ID_MICROSOFT 0x1414 +#define PCI_DEVICE_ID_HYPERV_VIDEO 0x5353 + +struct hyperv_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 */ + void __iomem *vram; + unsigned long fb_base; + unsigned long fb_size; + struct completion wait; + u32 synthvid_version; + u32 mmio_megabytes; + bool init_done; + + 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_device, dev) + +/* ---------------------------------------------------------------------- */ +/* Hyper-V Synthetic Video Protocol */ + +#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 synthvid_ver_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 synthvid_send(struct hv_device *hdev, + struct synthvid_msg *msg) +{ + static atomic64_t request_id = ATOMIC64_INIT(0); + 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_ERROR("Unable to send packet via vmbus\n"); + + return ret; +} + +static int synthvid_negotiate_ver(struct hv_device *hdev, u32 ver) +{ + struct hyperv_device *hv = hv_get_drvdata(hdev); + struct synthvid_msg *msg = (struct synthvid_msg *)hv->init_buf; + 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; + synthvid_send(hdev, msg); + + t = wait_for_completion_timeout(&hv->wait, VMBUS_VSP_TIMEOUT); + if (!t) { + DRM_ERROR("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("Synthvid Version major %d, minor %d\n", + SYNTHVID_VER_GET_MAJOR(ver), SYNTHVID_VER_GET_MINOR(ver)); + +out: + return ret; +} + +/* Should be done only once during init and resume */ +static int synthvid_update_vram_location(struct hv_device *hdev, + phys_addr_t vram_pp) +{ + struct hyperv_device *hv = hv_get_drvdata(hdev); + struct synthvid_msg *msg = (struct synthvid_msg *)hv->init_buf; + 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 = msg->vram.vram_gpa = vram_pp; + msg->vram.is_vram_gpa_specified = 1; + synthvid_send(hdev, msg); + + t = wait_for_completion_timeout(&hv->wait, VMBUS_VSP_TIMEOUT); + if (!t) { + DRM_ERROR("Time out on waiting vram location ack\n"); + ret = -ETIMEDOUT; + goto out; + } + if (msg->vram_ack.user_ctx != vram_pp) { + DRM_ERROR("Unable to set VRAM location\n"); + ret = -ENODEV; + } + +out: + return ret; +} + +static int synthvid_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; + + synthvid_send(hdev, &msg); + + return 0; +} + +static int synthvid_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; + + synthvid_send(hdev, &msg); + + return 0; +} + +static int synthvid_get_supported_resolution(struct hv_device *hdev) +{ + struct hyperv_device *hv = hv_get_drvdata(hdev); + struct synthvid_msg *msg = (struct synthvid_msg *)hv->init_buf; + 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; + synthvid_send(hdev, msg); + + t = wait_for_completion_timeout(&hv->wait, VMBUS_VSP_TIMEOUT); + if (!t) { + DRM_ERROR("Time out on waiting resolution response\n"); + ret = -ETIMEDOUT; + goto out; + } + + if (msg->resolution_resp.resolution_count == 0) { + DRM_ERROR("No supported resolutions\n"); + ret = -ENODEV; + goto out; + } + + index = msg->resolution_resp.default_resolution_index; + if (index >= msg->resolution_resp.resolution_count) { + DRM_ERROR("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; +} + +/* Actions on received messages from host */ +static void synthvid_recv_sub(struct hv_device *hdev) +{ + struct hyperv_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 synthvid_receive(void *ctx) +{ + struct hv_device *hdev = ctx; + struct hyperv_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) + synthvid_recv_sub(hdev); + } while (bytes_recvd > 0 && ret == 0); +} + +static int synthvid_connect_vsp(struct hv_device *hdev) +{ + struct hyperv_device *hv = hv_get_drvdata(hdev); + int ret; + + ret = vmbus_open(hdev->channel, VMBUS_RING_BUFSIZE, VMBUS_RING_BUFSIZE, + NULL, 0, synthvid_receive, hdev); + if (ret) { + DRM_ERROR("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 = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN10); + if (!ret) + break; + fallthrough; + case VERSION_WIN8: + case VERSION_WIN8_1: + ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN8); + if (!ret) + break; + fallthrough; + case VERSION_WS2008: + case VERSION_WIN7: + ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN7); + break; + default: + ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN10); + break; + } + + if (ret) { + DRM_ERROR("Synthetic video device version not accepted\n"); + goto error; + } + + if (hv->synthvid_version == SYNTHVID_VERSION_WIN7) + hv->screen_depth = SYNTHVID_DEPTH_WIN7; + else + hv->screen_depth = SYNTHVID_DEPTH_WIN8; + + if (synthvid_ver_ge(hv->synthvid_version, SYNTHVID_VERSION_WIN10)) { + ret = synthvid_get_supported_resolution(hdev); + if (ret) + DRM_ERROR("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; +} + +/* ---------------------------------------------------------------------- */ +/* VRAM blit */ + +static int hyperv_blit_to_vram_rect(struct drm_framebuffer *fb, + struct drm_rect *rect) +{ + struct hyperv_device *hv = to_hv(fb->dev); + void *vmap; + int idx, ret; + + ret = -ENODEV; + if (!drm_dev_enter(&hv->dev, &idx)) + goto out; + + ret = -ENOMEM; + vmap = drm_gem_shmem_vmap(fb->obj[0]); + if (!vmap) + goto out_dev_exit; + + drm_fb_memcpy_dstclip(hv->vram, vmap, fb, rect); + drm_gem_shmem_vunmap(fb->obj[0], vmap); + ret = 0; + +out_dev_exit: + drm_dev_exit(idx); +out: + return ret; +} + +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); +} + +/* ---------------------------------------------------------------------- */ +/* connector */ + +static int hyperv_connector_get_modes(struct drm_connector *connector) +{ + struct hyperv_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_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); + +} + +/* ---------------------------------------------------------------------- */ +/* display pipe */ + +static int hyperv_check_size(struct hyperv_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 enum drm_mode_status +hyperv_pipe_mode_valid(struct drm_simple_display_pipe *pipe, + const struct drm_display_mode *mode) +{ + struct hyperv_device *hv = to_hv(pipe->crtc.dev); + + if (hyperv_check_size(hv, mode->hdisplay, mode->vdisplay, NULL)) + return MODE_BAD; + + return MODE_OK; +} + +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_device *hv = to_hv(pipe->crtc.dev); + + synthvid_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 void hyperv_pipe_update(struct drm_simple_display_pipe *pipe, + struct drm_plane_state *old_state) +{ + struct hyperv_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); + synthvid_update_dirt(hv->hdev, &rect); + } +} + +static const struct drm_simple_display_pipe_funcs hyperv_pipe_funcs = { + .mode_valid = hyperv_pipe_mode_valid, + .enable = hyperv_pipe_enable, + .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_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); + + drm_plane_enable_fb_damage_clips(&(hv->pipe.plane)); + + return ret; +} + +/* ---------------------------------------------------------------------- */ +/* framebuffers & mode config */ + +static struct drm_framebuffer* +hyperv_fb_create(struct drm_device *dev, struct drm_file *file_priv, + const struct drm_mode_fb_cmd2 *mode_cmd) +{ + struct hyperv_device *hv = to_hv(dev); + + if (mode_cmd->pixel_format != DRM_FORMAT_XRGB8888) + return ERR_PTR(-EINVAL); + + if (mode_cmd->pitches[0] * mode_cmd->height > hv->fb_size) + return ERR_PTR(-EINVAL); + + return drm_gem_fb_create_with_dirty(dev, file_priv, mode_cmd); +} + +static const struct drm_mode_config_funcs hyperv_mode_config_funcs = { + .fb_create = hyperv_fb_create, + .atomic_check = drm_atomic_helper_check, + .atomic_commit = drm_atomic_helper_commit, +}; + +static int hyperv_mode_config_init(struct hyperv_device *hv) +{ + struct drm_device *dev = &hv->dev; + int ret; + + ret = drmm_mode_config_init(dev); + if (ret) + 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; + + return 0; +} + +/* ---------------------------------------------------------------------- */ +/* DRM */ + +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, +}; + +/* ---------------------------------------------------------------------- */ +/* pci/vmbus interface */ + +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_vmbus_probe(struct hv_device *hdev, + const struct hv_vmbus_device_id *dev_id) +{ + struct hyperv_device *hv; + struct drm_device *dev; + struct pci_dev *pdev; + int ret; + + hv = devm_drm_dev_alloc(&hdev->device, &hyperv_driver, + struct hyperv_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; + + pdev = pci_get_device(PCI_VENDOR_ID_MICROSOFT, + PCI_DEVICE_ID_HYPERV_VIDEO, NULL); + if (!pdev) { + DRM_ERROR("Unable to find PCI Hyper-V video\n"); + return -ENODEV; + } + + ret = drm_fb_helper_remove_conflicting_pci_framebuffers(pdev, "hypervdrmfb"); + if (ret) { + DRM_ERROR("Not able to remove boot fb\n"); + goto error; + } + + if (pci_request_region(pdev, 0, DRIVER_NAME) != 0) + DRM_WARN("Cannot request framebuffer, boot fb still active?\n"); + + if ((pdev->resource[0].flags & IORESOURCE_MEM) == 0) { + DRM_ERROR("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) { + DRM_ERROR("Resource not available\n"); + ret = -ENODEV; + goto error; + } + + /* Get the actual VRAM size from the device */ + ret = synthvid_connect_vsp(hdev); + if (ret) { + DRM_ERROR("Failed to connect to vmbus\n"); + 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 == NULL) { + DRM_ERROR("Failed to map vram\n"); + ret = -ENOMEM; + goto error1; + } + + /* + * Failing to update vram location is not fatal. Device will update + * dirty area till preferred resolution only. + */ + ret = synthvid_update_vram_location(hdev, hv->fb_base); + if (ret) + DRM_WARN("Failed to update vram location.\n"); + + ret = hyperv_mode_config_init(hv); + if (ret) { + DRM_ERROR("Failed to initialized mode setting\n"); + goto error1; + } + + ret = hyperv_conn_init(hv); + if (ret) { + DRM_ERROR("Failed to initialized connector\n"); + goto error1; + } + + ret = hyperv_pipe_init(hv); + if (ret) { + DRM_ERROR("Failed to initialized pipe\n"); + goto error1; + } + + drm_mode_config_reset(dev); + + ret = drm_dev_register(dev, 0); + if (ret) { + DRM_ERROR("Failed to register drm driver\n"); + goto error1; + } + + drm_fbdev_generic_setup(dev, dev->mode_config.preferred_depth); + + pci_dev_put(pdev); + return 0; + +error1: + vmbus_close(hdev->channel); +error: + hv_set_drvdata(hdev, NULL); + pci_dev_put(pdev); + return ret; +} + +static int hyperv_vmbus_remove(struct hv_device *hdev) +{ + struct drm_device *dev = hv_get_drvdata(hdev); + + drm_dev_unplug(dev); + drm_atomic_helper_shutdown(dev); + vmbus_close(hdev->channel); + hv_set_drvdata(hdev, NULL); + + 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); + int ret; + + ret = synthvid_connect_vsp(hdev); + 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, + }, +}; + +/* ---------------------------------------------------------------------- */ +/* module init/exit */ + +static int __init hyperv_init(void) +{ + int ret; + + ret = pci_register_driver(&hyperv_pci_driver); + if (ret != 0) { + DRM_ERROR("Failed to register pci driver\n"); + return ret; + } + + ret = vmbus_driver_register(&hyperv_hv_driver); + if (ret != 0) + DRM_ERROR("Failed to register vmbus driver\n"); + + return ret; +} + +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");