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serenity/Kernel/Devices/GPU/DisplayConnector.cpp
Liav A. 16244c490a Kernel: Allocate all device major numbers within one known header file 
We used to allocate major numbers quite randomly, with no common place
to look them up if needed.
This commit is changing that by placing all major number allocations
under a new C++ namespace, in the API/MajorNumberAllocation.h file.

We also add the foundations of what is needed before we can publish this
information (allocated numbers for block and char devices) to userspace.
2024-07-06 21:42:32 +02:00

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/*
* Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/API/Ioctl.h>
#include <Kernel/API/MajorNumberAllocation.h>
#include <Kernel/Devices/GPU/DisplayConnector.h>
#include <Kernel/Devices/GPU/Management.h>
#include <Kernel/FileSystem/SysFS/Subsystems/DeviceIdentifiers/CharacterDevicesDirectory.h>
#include <Kernel/FileSystem/SysFS/Subsystems/Devices/Graphics/DisplayConnector/DeviceDirectory.h>
#include <Kernel/FileSystem/SysFS/Subsystems/Devices/Graphics/DisplayConnector/Directory.h>
#include <Kernel/Memory/MemoryManager.h>
namespace Kernel {
DisplayConnector::DisplayConnector(PhysicalAddress framebuffer_address, size_t framebuffer_resource_size, bool enable_write_combine_optimization)
: CharacterDevice(MajorAllocation::CharacterDeviceFamily::GPU, GraphicsManagement::the().allocate_minor_device_number())
, m_enable_write_combine_optimization(enable_write_combine_optimization)
, m_framebuffer_at_arbitrary_physical_range(false)
, m_framebuffer_address(framebuffer_address)
, m_framebuffer_resource_size(framebuffer_resource_size)
{
}
DisplayConnector::DisplayConnector(size_t framebuffer_resource_size, bool enable_write_combine_optimization)
: CharacterDevice(MajorAllocation::CharacterDeviceFamily::GPU, GraphicsManagement::the().allocate_minor_device_number())
, m_enable_write_combine_optimization(enable_write_combine_optimization)
, m_framebuffer_at_arbitrary_physical_range(true)
, m_framebuffer_address({})
, m_framebuffer_resource_size(framebuffer_resource_size)
{
}
ErrorOr<NonnullLockRefPtr<Memory::VMObject>> DisplayConnector::vmobject_for_mmap(Process&, Memory::VirtualRange const&, u64& offset, bool)
{
VERIFY(m_shared_framebuffer_vmobject);
if (offset != 0)
return Error::from_errno(ENOTSUP);
return *m_shared_framebuffer_vmobject;
}
ErrorOr<size_t> DisplayConnector::read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t)
{
return Error::from_errno(ENOTIMPL);
}
ErrorOr<size_t> DisplayConnector::write(OpenFileDescription&, u64, UserOrKernelBuffer const&, size_t)
{
return Error::from_errno(ENOTIMPL);
}
void DisplayConnector::will_be_destroyed()
{
GraphicsManagement::the().detach_display_connector({}, *this);
// NOTE: We check if m_symlink_sysfs_component is not null, because if we failed
// at some point in DisplayConnector::after_inserting(), then that method will tear down
// the object internal members safely, so we don't want to do it again here.
if (m_symlink_sysfs_component) {
before_will_be_destroyed_remove_symlink_from_device_identifier_directory();
m_symlink_sysfs_component.clear();
}
// NOTE: We check if m_sysfs_device_directory is not null, because if we failed
// at some point in DisplayConnector::after_inserting(), then that method will tear down
// the object internal members safely, so we don't want to do it again here.
if (m_sysfs_device_directory) {
SysFSDisplayConnectorsDirectory::the().unplug({}, *m_sysfs_device_directory);
m_sysfs_device_directory.clear();
}
before_will_be_destroyed_remove_from_device_management();
}
ErrorOr<void> DisplayConnector::allocate_framebuffer_resources(size_t rounded_size)
{
VERIFY((rounded_size % PAGE_SIZE) == 0);
if (!m_framebuffer_at_arbitrary_physical_range) {
VERIFY(m_framebuffer_address.value().page_base() == m_framebuffer_address.value());
m_shared_framebuffer_vmobject = TRY(Memory::SharedFramebufferVMObject::try_create_for_physical_range(m_framebuffer_address.value(), rounded_size));
m_framebuffer_region = TRY(MM.allocate_mmio_kernel_region(m_framebuffer_address.value().page_base(), rounded_size, "Framebuffer"sv, Memory::Region::Access::ReadWrite));
} else {
m_shared_framebuffer_vmobject = TRY(Memory::SharedFramebufferVMObject::try_create_at_arbitrary_physical_range(rounded_size));
m_framebuffer_region = TRY(MM.allocate_kernel_region_with_vmobject(m_shared_framebuffer_vmobject->real_writes_framebuffer_vmobject(), rounded_size, "Framebuffer"sv, Memory::Region::Access::ReadWrite));
}
m_framebuffer_data = m_framebuffer_region->vaddr().as_ptr();
m_fake_writes_framebuffer_region = TRY(MM.allocate_kernel_region_with_vmobject(m_shared_framebuffer_vmobject->fake_writes_framebuffer_vmobject(), rounded_size, "Fake Writes Framebuffer"sv, Memory::Region::Access::ReadWrite));
return {};
}
ErrorOr<void> DisplayConnector::after_inserting()
{
ArmedScopeGuard clean_from_device_management([&] {
before_will_be_destroyed_remove_from_device_management();
});
auto sysfs_display_connector_device_directory = DisplayConnectorSysFSDirectory::create(SysFSDisplayConnectorsDirectory::the(), *this);
m_sysfs_device_directory = sysfs_display_connector_device_directory;
SysFSDisplayConnectorsDirectory::the().plug({}, *sysfs_display_connector_device_directory);
ArmedScopeGuard clean_from_sysfs_display_connector_device_directory([&] {
SysFSDisplayConnectorsDirectory::the().unplug({}, *m_sysfs_device_directory);
m_sysfs_device_directory.clear();
});
VERIFY(!m_symlink_sysfs_component);
auto sys_fs_component = TRY(SysFSSymbolicLinkDeviceComponent::try_create(SysFSCharacterDevicesDirectory::the(), *this, *m_sysfs_device_directory));
m_symlink_sysfs_component = sys_fs_component;
after_inserting_add_symlink_to_device_identifier_directory();
ArmedScopeGuard clean_symlink_to_device_identifier_directory([&] {
VERIFY(m_symlink_sysfs_component);
before_will_be_destroyed_remove_symlink_from_device_identifier_directory();
m_symlink_sysfs_component.clear();
});
if (auto result_or_error = Memory::page_round_up(m_framebuffer_resource_size); result_or_error.is_error()) {
// NOTE: The amount of framebuffer resource being specified is erroneous, then default to 16 MiB.
TRY(allocate_framebuffer_resources(16 * MiB));
m_framebuffer_resource_size = 16 * MiB;
} else {
if (auto allocation_result = allocate_framebuffer_resources(result_or_error.release_value()); allocation_result.is_error()) {
// NOTE: The amount of framebuffer resource being specified is too big, use 16 MiB just to get going.
TRY(allocate_framebuffer_resources(16 * MiB));
m_framebuffer_resource_size = 16 * MiB;
}
}
clean_from_device_management.disarm();
clean_from_sysfs_display_connector_device_directory.disarm();
clean_symlink_to_device_identifier_directory.disarm();
GraphicsManagement::the().attach_new_display_connector({}, *this);
if (m_enable_write_combine_optimization) {
[[maybe_unused]] auto result = m_framebuffer_region->set_write_combine(true);
}
after_inserting_add_to_device_management();
return {};
}
bool DisplayConnector::console_mode() const
{
VERIFY(m_control_lock.is_locked());
return m_console_mode;
}
void DisplayConnector::set_display_mode(Badge<GraphicsManagement>, DisplayMode mode)
{
SpinlockLocker locker(m_control_lock);
{
SpinlockLocker locker(m_modeset_lock);
[[maybe_unused]] auto result = set_y_offset(0);
}
m_console_mode = mode == DisplayMode::Console ? true : false;
if (m_console_mode) {
VERIFY(m_framebuffer_region->size() == m_fake_writes_framebuffer_region->size());
memcpy(m_fake_writes_framebuffer_region->vaddr().as_ptr(), m_framebuffer_region->vaddr().as_ptr(), m_framebuffer_region->size());
m_shared_framebuffer_vmobject->switch_to_fake_sink_framebuffer_writes({});
enable_console();
} else {
disable_console();
m_shared_framebuffer_vmobject->switch_to_real_framebuffer_writes({});
VERIFY(m_framebuffer_region->size() == m_fake_writes_framebuffer_region->size());
memcpy(m_framebuffer_region->vaddr().as_ptr(), m_fake_writes_framebuffer_region->vaddr().as_ptr(), m_framebuffer_region->size());
}
}
ErrorOr<void> DisplayConnector::initialize_edid_for_generic_monitor(Optional<Array<u8, 3>> possible_manufacturer_id_string)
{
u8 raw_manufacturer_id[2] = { 0x0, 0x0 };
if (possible_manufacturer_id_string.has_value()) {
Array<u8, 3> manufacturer_id_string = possible_manufacturer_id_string.release_value();
u8 byte1 = (((static_cast<u8>(manufacturer_id_string[0]) - '@') & 0x1f) << 2) | (((static_cast<u8>(manufacturer_id_string[1]) - '@') >> 3) & 3);
u8 byte2 = ((static_cast<u8>(manufacturer_id_string[2]) - '@') & 0x1f) | (((static_cast<u8>(manufacturer_id_string[1]) - '@') << 5) & 0xe0);
Array<u8, 2> manufacturer_id_string_packed_bytes = { byte1, byte2 };
raw_manufacturer_id[0] = manufacturer_id_string_packed_bytes[1];
raw_manufacturer_id[1] = manufacturer_id_string_packed_bytes[0];
}
Array<u8, 128> virtual_monitor_edid = {
0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, /* header */
raw_manufacturer_id[1], raw_manufacturer_id[0], /* manufacturer */
0x00, 0x00, /* product code */
0x00, 0x00, 0x00, 0x00, /* serial number goes here */
0x01, /* week of manufacture */
0x00, /* year of manufacture */
0x01, 0x03, /* EDID version */
0x80, /* capabilities - digital */
0x00, /* horiz. res in cm, zero for projectors */
0x00, /* vert. res in cm */
0x78, /* display gamma (120 == 2.2). */
0xEE, /* features (standby, suspend, off, RGB, std */
/* colour space, preferred timing mode) */
0xEE, 0x91, 0xA3, 0x54, 0x4C, 0x99, 0x26, 0x0F, 0x50, 0x54,
/* chromaticity for standard colour space. */
0x21, 0x08, 0x00, /* default timings: 640x480@60, 800x600@60, 1024x768@60 */
0xd1, 0xc0, /* standard timing 1920x1080 @ 60 Hz */
0xb3, 0x00, /* standard timing 1680x1050 @ 60 Hz */
0xa9, 0xc0, /* standard timing 1600x900 @ 60 Hz */
0x95, 0x00, /* standard timing 1440x900 @ 60 Hz */
0x8b, 0xc0, /* standard timing 1360x768 @ 60 Hz */
0x81, 0x80, /* standard timing 1280x1024 @ 60 Hz */
0x81, 0x40, /* standard timing 1280x960 @ 60 Hz */
0x81, 0xc0, /* standard timing 1280x720 @ 60 Hz */
0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x06, 0x00, 0x02, 0x02,
0x02, 0x02,
/* descriptor block 1 goes below */
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
/* descriptor block 2, monitor ranges */
0x00, 0x00, 0x00, 0xFD, 0x00,
0x00, 0xC8, 0x00, 0xC8, 0x64, 0x00, 0x0A, 0x20, 0x20, 0x20,
0x20, 0x20,
/* 0-200Hz vertical, 0-200KHz horizontal, 1000MHz pixel clock */
0x20,
/* descriptor block 3, monitor name */
0x00, 0x00, 0x00, 0xFC, 0x00,
'G', 'e', 'n', 'e', 'r', 'i', 'c', 'S', 'c', 'r', 'e', 'e', 'n',
/* descriptor block 4: dummy data */
0x00, 0x00, 0x00, 0x10, 0x00,
0x0A, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20,
0x00, /* number of extensions */
0x00 /* checksum goes here */
};
// Note: Fix checksum to avoid warnings about checksum mismatch.
size_t checksum = 0;
// Note: Read all 127 bytes to add them to the checksum. Byte 128 is zeroed so
// we could technically add it to the sum result, but it could lead to an error if it contained
// a non-zero value, so we are not using it.
for (size_t index = 0; index < sizeof(virtual_monitor_edid) - 1; index++)
checksum += virtual_monitor_edid[index];
virtual_monitor_edid[127] = 0x100 - checksum;
set_edid_bytes(virtual_monitor_edid);
return {};
}
void DisplayConnector::set_edid_bytes(Array<u8, 128> const& edid_bytes, bool might_be_invalid)
{
memcpy((u8*)m_edid_bytes, edid_bytes.data(), sizeof(m_edid_bytes));
if (auto parsed_edid = EDID::Parser::from_bytes({ m_edid_bytes, sizeof(m_edid_bytes) }); !parsed_edid.is_error()) {
m_edid_parser = parsed_edid.release_value();
m_edid_valid = true;
} else {
if (!might_be_invalid) {
dmesgln("DisplayConnector: Print offending EDID");
for (size_t x = 0; x < 128; x = x + 16) {
dmesgln("{:02x} {:02x} {:02x} {:02x} {:02x} {:02x} {:02x} {:02x} {:02x} {:02x} {:02x} {:02x} {:02x} {:02x} {:02x} {:02x}",
m_edid_bytes[x], m_edid_bytes[x + 1], m_edid_bytes[x + 2], m_edid_bytes[x + 3],
m_edid_bytes[x + 4], m_edid_bytes[x + 5], m_edid_bytes[x + 6], m_edid_bytes[x + 7],
m_edid_bytes[x + 8], m_edid_bytes[x + 9], m_edid_bytes[x + 10], m_edid_bytes[x + 11],
m_edid_bytes[x + 12], m_edid_bytes[x + 13], m_edid_bytes[x + 14], m_edid_bytes[x + 15]);
}
dmesgln("DisplayConnector: Parsing EDID failed: {}", parsed_edid.error());
}
}
}
ErrorOr<void> DisplayConnector::flush_rectangle(size_t, FBRect const&)
{
return Error::from_errno(ENOTSUP);
}
DisplayConnector::ModeSetting DisplayConnector::current_mode_setting() const
{
SpinlockLocker locker(m_modeset_lock);
return m_current_mode_setting;
}
ErrorOr<ByteBuffer> DisplayConnector::get_edid() const
{
if (!m_edid_valid)
return Error::from_errno(ENODEV);
return ByteBuffer::copy(m_edid_bytes, sizeof(m_edid_bytes));
}
struct GraphicsIOCtlChecker {
unsigned ioctl_number;
StringView name;
bool requires_ownership { false };
};
static constexpr GraphicsIOCtlChecker s_checkers[] = {
{ GRAPHICS_IOCTL_GET_PROPERTIES, "GRAPHICS_IOCTL_GET_PROPERTIES"sv, false },
{ GRAPHICS_IOCTL_SET_HEAD_VERTICAL_OFFSET_BUFFER, "GRAPHICS_IOCTL_SET_HEAD_VERTICAL_OFFSET_BUFFER"sv, true },
{ GRAPHICS_IOCTL_GET_HEAD_VERTICAL_OFFSET_BUFFER, "GRAPHICS_IOCTL_GET_HEAD_VERTICAL_OFFSET_BUFFER"sv, false },
{ GRAPHICS_IOCTL_FLUSH_HEAD_BUFFERS, "GRAPHICS_IOCTL_FLUSH_HEAD_BUFFERS"sv, true },
{ GRAPHICS_IOCTL_FLUSH_HEAD, "GRAPHICS_IOCTL_FLUSH_HEAD"sv, true },
{ GRAPHICS_IOCTL_SET_HEAD_MODE_SETTING, "GRAPHICS_IOCTL_SET_HEAD_MODE_SETTING"sv, true },
{ GRAPHICS_IOCTL_GET_HEAD_MODE_SETTING, "GRAPHICS_IOCTL_GET_HEAD_MODE_SETTING"sv, false },
{ GRAPHICS_IOCTL_SET_SAFE_HEAD_MODE_SETTING, "GRAPHICS_IOCTL_SET_SAFE_HEAD_MODE_SETTING"sv, true },
{ GRAPHICS_IOCTL_SET_RESPONSIBLE, "GRAPHICS_IOCTL_SET_RESPONSIBLE"sv, false },
{ GRAPHICS_IOCTL_UNSET_RESPONSIBLE, "GRAPHICS_IOCTL_UNSET_RESPONSIBLE"sv, true },
};
static StringView ioctl_to_stringview(unsigned request)
{
for (auto& checker : s_checkers) {
if (checker.ioctl_number == request)
return checker.name;
}
return "unknown"sv;
}
ErrorOr<bool> DisplayConnector::ioctl_requires_ownership(unsigned request) const
{
for (auto& checker : s_checkers) {
if (checker.ioctl_number == request)
return checker.requires_ownership;
}
// Note: In case of unknown ioctl, return EINVAL.
return Error::from_errno(EINVAL);
}
ErrorOr<void> DisplayConnector::ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg)
{
TRY(Process::current().require_promise(Pledge::video));
// Note: We only allow to set responsibility on a DisplayConnector,
// get the current ModeSetting or the hardware framebuffer properties without the
// need of having an established responsibility on a DisplayConnector.
auto needs_ownership = TRY(ioctl_requires_ownership(request));
if (needs_ownership) {
auto process = m_responsible_process.strong_ref();
if (!process || process.ptr() != &Process::current()) {
dbgln("DisplayConnector::ioctl: {} requires ownership over the device", ioctl_to_stringview(request));
return Error::from_errno(EPERM);
}
}
switch (request) {
case GRAPHICS_IOCTL_SET_RESPONSIBLE: {
SpinlockLocker locker(m_responsible_process_lock);
auto process = m_responsible_process.strong_ref();
// Note: If there's already a process being responsible, just return an error.
// We could technically return 0 if the requesting process was already
// set to be responsible for this DisplayConnector, but it services
// no good purpose and should be considered a bug if this happens anyway.
if (process)
return Error::from_errno(EPERM);
m_responsible_process = Process::current();
return {};
}
case GRAPHICS_IOCTL_UNSET_RESPONSIBLE: {
SpinlockLocker locker(m_responsible_process_lock);
auto process = m_responsible_process.strong_ref();
if (!process)
return Error::from_errno(ESRCH);
if (process.ptr() != &Process::current())
return Error::from_errno(EPERM);
m_responsible_process.clear();
return {};
}
case GRAPHICS_IOCTL_GET_PROPERTIES: {
VERIFY(m_shared_framebuffer_vmobject);
auto user_properties = static_ptr_cast<GraphicsConnectorProperties*>(arg);
GraphicsConnectorProperties properties {};
properties.flushing_support = flush_support();
properties.doublebuffer_support = double_framebuffering_capable();
properties.partial_flushing_support = partial_flush_support();
properties.refresh_rate_support = refresh_rate_support();
properties.max_buffer_bytes = m_shared_framebuffer_vmobject->size();
return copy_to_user(user_properties, &properties);
}
case GRAPHICS_IOCTL_GET_HEAD_MODE_SETTING: {
auto user_head_mode_setting = static_ptr_cast<GraphicsHeadModeSetting*>(arg);
GraphicsHeadModeSetting head_mode_setting {};
TRY(copy_from_user(&head_mode_setting, user_head_mode_setting));
{
SpinlockLocker control_locker(m_control_lock);
head_mode_setting.horizontal_stride = m_current_mode_setting.horizontal_stride;
head_mode_setting.pixel_clock_in_khz = m_current_mode_setting.pixel_clock_in_khz;
head_mode_setting.horizontal_active = m_current_mode_setting.horizontal_active;
head_mode_setting.horizontal_front_porch_pixels = m_current_mode_setting.horizontal_front_porch_pixels;
head_mode_setting.horizontal_sync_time_pixels = m_current_mode_setting.horizontal_sync_time_pixels;
head_mode_setting.horizontal_blank_pixels = m_current_mode_setting.horizontal_blank_pixels;
head_mode_setting.vertical_active = m_current_mode_setting.vertical_active;
head_mode_setting.vertical_front_porch_lines = m_current_mode_setting.vertical_front_porch_lines;
head_mode_setting.vertical_sync_time_lines = m_current_mode_setting.vertical_sync_time_lines;
head_mode_setting.vertical_blank_lines = m_current_mode_setting.vertical_blank_lines;
head_mode_setting.horizontal_offset = m_current_mode_setting.horizontal_offset;
head_mode_setting.vertical_offset = m_current_mode_setting.vertical_offset;
}
return copy_to_user(user_head_mode_setting, &head_mode_setting);
}
case GRAPHICS_IOCTL_SET_HEAD_MODE_SETTING: {
auto user_mode_setting = static_ptr_cast<GraphicsHeadModeSetting const*>(arg);
auto head_mode_setting = TRY(copy_typed_from_user(user_mode_setting));
if (head_mode_setting.horizontal_stride < 0)
return Error::from_errno(EINVAL);
if (head_mode_setting.pixel_clock_in_khz < 0)
return Error::from_errno(EINVAL);
if (head_mode_setting.horizontal_active < 0)
return Error::from_errno(EINVAL);
if (head_mode_setting.horizontal_front_porch_pixels < 0)
return Error::from_errno(EINVAL);
if (head_mode_setting.horizontal_sync_time_pixels < 0)
return Error::from_errno(EINVAL);
if (head_mode_setting.horizontal_blank_pixels < 0)
return Error::from_errno(EINVAL);
if (head_mode_setting.vertical_active < 0)
return Error::from_errno(EINVAL);
if (head_mode_setting.vertical_front_porch_lines < 0)
return Error::from_errno(EINVAL);
if (head_mode_setting.vertical_sync_time_lines < 0)
return Error::from_errno(EINVAL);
if (head_mode_setting.vertical_blank_lines < 0)
return Error::from_errno(EINVAL);
if (head_mode_setting.horizontal_offset < 0)
return Error::from_errno(EINVAL);
if (head_mode_setting.vertical_offset < 0)
return Error::from_errno(EINVAL);
{
SpinlockLocker control_locker(m_control_lock);
ModeSetting requested_mode_setting;
requested_mode_setting.horizontal_stride = 0;
requested_mode_setting.pixel_clock_in_khz = head_mode_setting.pixel_clock_in_khz;
requested_mode_setting.horizontal_active = head_mode_setting.horizontal_active;
requested_mode_setting.horizontal_front_porch_pixels = head_mode_setting.horizontal_front_porch_pixels;
requested_mode_setting.horizontal_sync_time_pixels = head_mode_setting.horizontal_sync_time_pixels;
requested_mode_setting.horizontal_blank_pixels = head_mode_setting.horizontal_blank_pixels;
requested_mode_setting.vertical_active = head_mode_setting.vertical_active;
requested_mode_setting.vertical_front_porch_lines = head_mode_setting.vertical_front_porch_lines;
requested_mode_setting.vertical_sync_time_lines = head_mode_setting.vertical_sync_time_lines;
requested_mode_setting.vertical_blank_lines = head_mode_setting.vertical_blank_lines;
requested_mode_setting.horizontal_offset = head_mode_setting.horizontal_offset;
requested_mode_setting.vertical_offset = head_mode_setting.vertical_offset;
TRY(set_mode_setting(requested_mode_setting));
}
return {};
}
case GRAPHICS_IOCTL_SET_SAFE_HEAD_MODE_SETTING: {
SpinlockLocker control_locker(m_control_lock);
TRY(set_safe_mode_setting());
return {};
}
case GRAPHICS_IOCTL_SET_HEAD_VERTICAL_OFFSET_BUFFER: {
// FIXME: We silently ignore the request if we are in console mode.
// WindowServer is not ready yet to handle errors such as EBUSY currently.
SpinlockLocker control_locker(m_control_lock);
if (console_mode()) {
return {};
}
auto user_head_vertical_buffer_offset = static_ptr_cast<GraphicsHeadVerticalOffset const*>(arg);
auto head_vertical_buffer_offset = TRY(copy_typed_from_user(user_head_vertical_buffer_offset));
SpinlockLocker locker(m_modeset_lock);
if (head_vertical_buffer_offset.offsetted < 0 || head_vertical_buffer_offset.offsetted > 1)
return Error::from_errno(EINVAL);
TRY(set_y_offset(head_vertical_buffer_offset.offsetted == 0 ? 0 : m_current_mode_setting.vertical_active));
if (head_vertical_buffer_offset.offsetted == 0)
m_vertical_offsetted = false;
else
m_vertical_offsetted = true;
return {};
}
case GRAPHICS_IOCTL_GET_HEAD_VERTICAL_OFFSET_BUFFER: {
auto user_head_vertical_buffer_offset = static_ptr_cast<GraphicsHeadVerticalOffset*>(arg);
GraphicsHeadVerticalOffset head_vertical_buffer_offset {};
TRY(copy_from_user(&head_vertical_buffer_offset, user_head_vertical_buffer_offset));
head_vertical_buffer_offset.offsetted = m_vertical_offsetted;
return copy_to_user(user_head_vertical_buffer_offset, &head_vertical_buffer_offset);
}
case GRAPHICS_IOCTL_FLUSH_HEAD_BUFFERS: {
if (console_mode())
return {};
if (!partial_flush_support())
return Error::from_errno(ENOTSUP);
MutexLocker locker(m_flushing_lock);
auto user_flush_rects = static_ptr_cast<FBFlushRects const*>(arg);
auto flush_rects = TRY(copy_typed_from_user(user_flush_rects));
if (Checked<unsigned>::multiplication_would_overflow(flush_rects.count, sizeof(FBRect)))
return Error::from_errno(EFAULT);
if (flush_rects.count > 0) {
for (unsigned i = 0; i < flush_rects.count; i++) {
FBRect user_dirty_rect;
TRY(copy_from_user(&user_dirty_rect, &flush_rects.rects[i]));
{
SpinlockLocker control_locker(m_control_lock);
if (console_mode()) {
return {};
}
TRY(flush_rectangle(flush_rects.buffer_index, user_dirty_rect));
}
}
}
return {};
};
case GRAPHICS_IOCTL_FLUSH_HEAD: {
// FIXME: We silently ignore the request if we are in console mode.
// WindowServer is not ready yet to handle errors such as EBUSY currently.
MutexLocker locker(m_flushing_lock);
SpinlockLocker control_locker(m_control_lock);
if (console_mode()) {
return {};
}
if (!flush_support())
return Error::from_errno(ENOTSUP);
TRY(flush_first_surface());
return {};
}
}
// Note: We already verify that the IOCTL is supported and not unknown in
// the call to the ioctl_requires_ownership method, so if we reached this
// section of the code, this is bug.
VERIFY_NOT_REACHED();
}
}
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