mirror of
https://github.com/RGBCube/serenity
synced 2025-07-26 04:47:34 +00:00
Kernel: Add support for multiple VirtIO GPU outputs
This creates /dev/fbX devices for each physical output, owned by the parent VirtIOGPU instance. This allows mapping and setting resolutions independently for each output.
This commit is contained in:
Tom
Andreas Kling
parent
708f27ca0e
commit
8749235046
8 changed files with 305 additions and 194 deletions
|
|
@ -10,12 +10,34 @@
|
|||
|
||||
namespace Kernel::Graphics {
|
||||
|
||||
VirtIOFrameBufferDevice::VirtIOFrameBufferDevice(RefPtr<VirtIOGPU> virtio_gpu)
|
||||
VirtIOFrameBufferDevice::VirtIOFrameBufferDevice(VirtIOGPU& virtio_gpu, VirtIOGPUScanoutID scanout)
|
||||
: BlockDevice(29, GraphicsManagement::the().allocate_minor_device_number())
|
||||
, m_gpu(virtio_gpu)
|
||||
, m_scanout(scanout)
|
||||
{
|
||||
auto& info = display_info();
|
||||
|
||||
Locker locker(m_gpu.operation_lock());
|
||||
|
||||
// 1. Allocate frame buffer
|
||||
// FIXME: We really should be trying to allocate a small amount of pages initially, with ensure_backing_storage increasing the backing memory of the region as needed
|
||||
size_t buffer_length = calculate_framebuffer_size(MAX_VIRTIOGPU_RESOLUTION_WIDTH, MAX_VIRTIOGPU_RESOLUTION_HEIGHT);
|
||||
m_framebuffer = MM.allocate_kernel_region(page_round_up(buffer_length), String::formatted("VirtGPU FrameBuffer #{}", scanout.value()), Region::Access::Read | Region::Access::Write, AllocationStrategy::AllocateNow);
|
||||
// 2. Create BUFFER using VIRTIO_GPU_CMD_RESOURCE_CREATE_2D
|
||||
m_resource_id = m_gpu.create_2d_resource(info.rect);
|
||||
// 3. Attach backing storage using VIRTIO_GPU_CMD_RESOURCE_ATTACH_BACKING
|
||||
m_gpu.ensure_backing_storage(*m_framebuffer, buffer_length, m_resource_id);
|
||||
// 4. Use VIRTIO_GPU_CMD_SET_SCANOUT to link the framebuffer to a display scanout.
|
||||
m_gpu.set_scanout_resource(m_scanout.value(), m_resource_id, info.rect);
|
||||
// 5. Render our test pattern
|
||||
draw_ntsc_test_pattern();
|
||||
// 6. Use VIRTIO_GPU_CMD_TRANSFER_TO_HOST_2D to update the host resource from guest memory.
|
||||
transfer_framebuffer_data_to_host(info.rect);
|
||||
// 7. Use VIRTIO_GPU_CMD_RESOURCE_FLUSH to flush the updated resource to the display.
|
||||
flush_displayed_image(info.rect);
|
||||
|
||||
auto write_sink_page = MM.allocate_user_physical_page(MemoryManager::ShouldZeroFill::No).release_nonnull();
|
||||
auto num_needed_pages = m_gpu->framebuffer_vm_object().page_count();
|
||||
auto num_needed_pages = m_framebuffer->vmobject().page_count();
|
||||
NonnullRefPtrVector<PhysicalPage> pages;
|
||||
for (auto i = 0u; i < num_needed_pages; ++i) {
|
||||
pages.append(write_sink_page);
|
||||
|
|
@ -27,13 +49,66 @@ VirtIOFrameBufferDevice::~VirtIOFrameBufferDevice()
|
|||
{
|
||||
}
|
||||
|
||||
VirtIOGPURespDisplayInfo::VirtIOGPUDisplayOne const& VirtIOFrameBufferDevice::display_info() const
|
||||
{
|
||||
return m_gpu.display_info(m_scanout);
|
||||
}
|
||||
|
||||
VirtIOGPURespDisplayInfo::VirtIOGPUDisplayOne& VirtIOFrameBufferDevice::display_info()
|
||||
{
|
||||
return m_gpu.display_info(m_scanout);
|
||||
}
|
||||
|
||||
size_t VirtIOFrameBufferDevice::size_in_bytes() const
|
||||
{
|
||||
auto& info = display_info();
|
||||
return info.rect.width * info.rect.height * sizeof(u32);
|
||||
}
|
||||
|
||||
void VirtIOFrameBufferDevice::flush_dirty_window(VirtIOGPURect const& dirty_rect)
|
||||
{
|
||||
m_gpu.flush_dirty_window(m_scanout, dirty_rect, m_resource_id);
|
||||
}
|
||||
|
||||
void VirtIOFrameBufferDevice::transfer_framebuffer_data_to_host(VirtIOGPURect const& rect)
|
||||
{
|
||||
m_gpu.transfer_framebuffer_data_to_host(m_scanout, rect, m_resource_id);
|
||||
}
|
||||
|
||||
void VirtIOFrameBufferDevice::flush_displayed_image(VirtIOGPURect const& dirty_rect)
|
||||
{
|
||||
m_gpu.flush_displayed_image(dirty_rect, m_resource_id);
|
||||
}
|
||||
|
||||
bool VirtIOFrameBufferDevice::try_to_set_resolution(size_t width, size_t height)
|
||||
{
|
||||
if (width > MAX_VIRTIOGPU_RESOLUTION_WIDTH || height > MAX_VIRTIOGPU_RESOLUTION_HEIGHT)
|
||||
return false;
|
||||
Locker locker(m_gpu.operation_lock());
|
||||
VirtIOGPURect rect = {
|
||||
.x = 0,
|
||||
.y = 0,
|
||||
.width = (u32)width,
|
||||
.height = (u32)height,
|
||||
};
|
||||
auto old_resource_id = m_resource_id;
|
||||
auto new_resource_id = m_gpu.create_2d_resource(rect);
|
||||
m_gpu.ensure_backing_storage(*m_framebuffer, calculate_framebuffer_size(width, height), new_resource_id);
|
||||
m_gpu.set_scanout_resource(m_scanout.value(), new_resource_id, rect);
|
||||
m_gpu.detach_backing_storage(old_resource_id);
|
||||
m_gpu.delete_resource(old_resource_id);
|
||||
m_resource_id = new_resource_id;
|
||||
display_info().rect = rect;
|
||||
return true;
|
||||
}
|
||||
|
||||
int VirtIOFrameBufferDevice::ioctl(FileDescription&, unsigned request, FlatPtr arg)
|
||||
{
|
||||
REQUIRE_PROMISE(video);
|
||||
switch (request) {
|
||||
case FB_IOCTL_GET_SIZE_IN_BYTES: {
|
||||
auto* out = (size_t*)arg;
|
||||
size_t value = m_gpu->framebuffer_size_in_bytes();
|
||||
size_t value = size_in_bytes();
|
||||
if (!copy_to_user(out, &value))
|
||||
return -EFAULT;
|
||||
return 0;
|
||||
|
|
@ -43,9 +118,9 @@ int VirtIOFrameBufferDevice::ioctl(FileDescription&, unsigned request, FlatPtr a
|
|||
FBResolution resolution;
|
||||
if (!copy_from_user(&resolution, user_resolution))
|
||||
return -EFAULT;
|
||||
if (!m_gpu->try_to_set_resolution(resolution.width, resolution.height))
|
||||
if (!try_to_set_resolution(resolution.width, resolution.height))
|
||||
return -EINVAL;
|
||||
resolution.pitch = m_gpu->framebuffer_pitch();
|
||||
resolution.pitch = pitch();
|
||||
if (!copy_to_user(user_resolution, &resolution))
|
||||
return -EFAULT;
|
||||
return 0;
|
||||
|
|
@ -53,9 +128,9 @@ int VirtIOFrameBufferDevice::ioctl(FileDescription&, unsigned request, FlatPtr a
|
|||
case FB_IOCTL_GET_RESOLUTION: {
|
||||
auto* user_resolution = (FBResolution*)arg;
|
||||
FBResolution resolution;
|
||||
resolution.pitch = m_gpu->framebuffer_pitch();
|
||||
resolution.width = m_gpu->framebuffer_width();
|
||||
resolution.height = m_gpu->framebuffer_height();
|
||||
resolution.pitch = pitch();
|
||||
resolution.width = width();
|
||||
resolution.height = height();
|
||||
if (!copy_to_user(user_resolution, &resolution))
|
||||
return -EFAULT;
|
||||
return 0;
|
||||
|
|
@ -71,7 +146,7 @@ int VirtIOFrameBufferDevice::ioctl(FileDescription&, unsigned request, FlatPtr a
|
|||
.height = user_dirty_rect.height
|
||||
};
|
||||
if (m_are_writes_active)
|
||||
m_gpu->flush_dirty_window(dirty_rect);
|
||||
flush_dirty_window(dirty_rect);
|
||||
return 0;
|
||||
}
|
||||
default:
|
||||
|
|
@ -86,14 +161,14 @@ KResultOr<Region*> VirtIOFrameBufferDevice::mmap(Process& process, FileDescripti
|
|||
return ENODEV;
|
||||
if (offset != 0)
|
||||
return ENXIO;
|
||||
if (range.size() != page_round_up(m_gpu->framebuffer_size_in_bytes()))
|
||||
if (range.size() != page_round_up(size_in_bytes()))
|
||||
return EOVERFLOW;
|
||||
|
||||
// We only allow one process to map the region
|
||||
if (m_userspace_mmap_region)
|
||||
return ENOMEM;
|
||||
|
||||
auto vmobject = m_are_writes_active ? m_gpu->framebuffer_vm_object().clone() : m_framebuffer_sink_vmobject;
|
||||
auto vmobject = m_are_writes_active ? m_framebuffer->vmobject().clone() : m_framebuffer_sink_vmobject;
|
||||
if (vmobject.is_null())
|
||||
return ENOMEM;
|
||||
|
||||
|
|
@ -127,9 +202,80 @@ void VirtIOFrameBufferDevice::activate_writes()
|
|||
m_are_writes_active = true;
|
||||
if (m_userspace_mmap_region) {
|
||||
auto* region = m_userspace_mmap_region.unsafe_ptr();
|
||||
region->set_vmobject(m_gpu->framebuffer_vm_object());
|
||||
region->set_vmobject(m_framebuffer->vmobject());
|
||||
region->remap();
|
||||
}
|
||||
}
|
||||
|
||||
void VirtIOFrameBufferDevice::clear_to_black()
|
||||
{
|
||||
auto& info = display_info();
|
||||
size_t width = info.rect.width;
|
||||
size_t height = info.rect.height;
|
||||
u8* data = m_framebuffer->vaddr().as_ptr();
|
||||
for (size_t i = 0; i < width * height; ++i) {
|
||||
data[4 * i + 0] = 0x00;
|
||||
data[4 * i + 1] = 0x00;
|
||||
data[4 * i + 2] = 0x00;
|
||||
data[4 * i + 3] = 0xff;
|
||||
}
|
||||
}
|
||||
|
||||
void VirtIOFrameBufferDevice::draw_ntsc_test_pattern()
|
||||
{
|
||||
static constexpr u8 colors[12][4] = {
|
||||
{ 0xff, 0xff, 0xff, 0xff }, // White
|
||||
{ 0x00, 0xff, 0xff, 0xff }, // Primary + Composite colors
|
||||
{ 0xff, 0xff, 0x00, 0xff },
|
||||
{ 0x00, 0xff, 0x00, 0xff },
|
||||
{ 0xff, 0x00, 0xff, 0xff },
|
||||
{ 0x00, 0x00, 0xff, 0xff },
|
||||
{ 0xff, 0x00, 0x00, 0xff },
|
||||
{ 0xba, 0x01, 0x5f, 0xff }, // Dark blue
|
||||
{ 0x8d, 0x3d, 0x00, 0xff }, // Purple
|
||||
{ 0x22, 0x22, 0x22, 0xff }, // Shades of gray
|
||||
{ 0x10, 0x10, 0x10, 0xff },
|
||||
{ 0x00, 0x00, 0x00, 0xff },
|
||||
};
|
||||
auto& info = display_info();
|
||||
size_t width = info.rect.width;
|
||||
size_t height = info.rect.height;
|
||||
u8* data = m_framebuffer->vaddr().as_ptr();
|
||||
// Draw NTSC test card
|
||||
for (size_t y = 0; y < height; ++y) {
|
||||
for (size_t x = 0; x < width; ++x) {
|
||||
size_t color = 0;
|
||||
if (3 * y < 2 * height) {
|
||||
// Top 2/3 of image is 7 vertical stripes of color spectrum
|
||||
color = (7 * x) / width;
|
||||
} else if (4 * y < 3 * height) {
|
||||
// 2/3 mark to 3/4 mark is backwards color spectrum alternating with black
|
||||
auto segment = (7 * x) / width;
|
||||
color = segment % 2 ? 10 : 6 - segment;
|
||||
} else {
|
||||
if (28 * x < 5 * width) {
|
||||
color = 8;
|
||||
} else if (28 * x < 10 * width) {
|
||||
color = 0;
|
||||
} else if (28 * x < 15 * width) {
|
||||
color = 7;
|
||||
} else if (28 * x < 20 * width) {
|
||||
color = 10;
|
||||
} else if (7 * x < 6 * width) {
|
||||
// Grayscale gradient
|
||||
color = 26 - ((21 * x) / width);
|
||||
} else {
|
||||
// Solid black
|
||||
color = 10;
|
||||
}
|
||||
}
|
||||
u8* pixel = &data[4 * (y * width + x)];
|
||||
for (int i = 0; i < 4; ++i) {
|
||||
pixel[i] = colors[color][i];
|
||||
}
|
||||
}
|
||||
}
|
||||
dbgln_if(VIRTIO_DEBUG, "Finish drawing the pattern");
|
||||
}
|
||||
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue