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/*
* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Checked.h>
#include <AK/Try.h>
#include <Kernel/API/POSIX/errno.h>
#include <Kernel/Debug.h>
#include <Kernel/Devices/DeviceManagement.h>
#include <Kernel/Graphics/FramebufferDevice.h>
#include <Kernel/Graphics/GraphicsManagement.h>
#include <Kernel/Memory/AnonymousVMObject.h>
#include <Kernel/Memory/MemoryManager.h>
#include <Kernel/Process.h>
#include <Kernel/Sections.h>
#include <Kernel/StdLib.h>
#define MAX_RESOLUTION_WIDTH 4096
#define MAX_RESOLUTION_HEIGHT 2160
namespace Kernel {
ErrorOr<void> GenericFramebufferDevice::verify_head_index(int head_index) const
{
if (head_index < 0)
return Error::from_errno(EINVAL);
if (!multihead_support() && head_index > 0)
return Error::from_errno(ENOTSUP);
return {};
}
ErrorOr<void> GenericFramebufferDevice::ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg)
{
if (request != FB_IOCTL_GET_HEAD_EDID) {
// Allow anyone to query the EDID. Eventually we'll publish the current EDID on /sys
// so it doesn't really make sense to require the video pledge to query it.
TRY(Process::current().require_promise(Pledge::video));
}
switch (request) {
case FB_IOCTL_GET_PROPERTIES: {
auto user_properties = static_ptr_cast<FBProperties*>(arg);
FBProperties properties {};
auto adapter = m_graphics_adapter.strong_ref();
if (!adapter)
return Error::from_errno(EIO);
properties.multihead_support = multihead_support();
properties.flushing_support = flushing_support();
properties.doublebuffer_support = adapter->double_framebuffering_capable();
properties.partial_flushing_support = partial_flushing_support();
return copy_to_user(user_properties, &properties);
}
case FB_IOCTL_GET_HEAD_PROPERTIES: {
auto user_head_properties = static_ptr_cast<FBHeadProperties*>(arg);
FBHeadProperties head_properties {};
TRY(copy_from_user(&head_properties, user_head_properties));
TRY(verify_head_index(head_properties.head_index));
head_properties.pitch = TRY(pitch(head_properties.head_index));
head_properties.width = TRY(width(head_properties.head_index));
head_properties.height = TRY(height(head_properties.head_index));
head_properties.buffer_length = TRY(buffer_length(head_properties.head_index));
head_properties.offset = TRY(vertical_offset(head_properties.head_index));
return copy_to_user(user_head_properties, &head_properties);
}
case FB_IOCTL_GET_HEAD_EDID: {
auto user_head_edid = static_ptr_cast<FBHeadEDID*>(arg);
FBHeadEDID head_edid {};
TRY(copy_from_user(&head_edid, user_head_edid));
TRY(verify_head_index(head_edid.head_index));
auto edid_bytes = TRY(get_edid(head_edid.head_index));
if (head_edid.bytes != nullptr) {
// Only return the EDID if a buffer was provided. Either way,
// we'll write back the bytes_size with the actual size
if (head_edid.bytes_size < edid_bytes.size()) {
head_edid.bytes_size = edid_bytes.size();
TRY(copy_to_user(user_head_edid, &head_edid));
return Error::from_errno(EOVERFLOW);
}
TRY(copy_to_user(head_edid.bytes, (void const*)edid_bytes.data(), edid_bytes.size()));
}
head_edid.bytes_size = edid_bytes.size();
return copy_to_user(user_head_edid, &head_edid);
}
case FB_IOCTL_SET_HEAD_RESOLUTION: {
auto user_head_resolution = static_ptr_cast<FBHeadResolution const*>(arg);
auto head_resolution = TRY(copy_typed_from_user(user_head_resolution));
TRY(verify_head_index(head_resolution.head_index));
if (head_resolution.pitch < 0)
return Error::from_errno(EINVAL);
if (head_resolution.width < 0)
return Error::from_errno(EINVAL);
if (head_resolution.height < 0)
return Error::from_errno(EINVAL);
TRY(set_head_resolution(head_resolution.head_index, head_resolution.width, head_resolution.height, head_resolution.pitch));
return {};
}
case FB_IOCTL_SET_HEAD_VERTICAL_OFFSET_BUFFER: {
auto user_head_vertical_buffer_offset = static_ptr_cast<FBHeadVerticalOffset const*>(arg);
auto head_vertical_buffer_offset = TRY(copy_typed_from_user(user_head_vertical_buffer_offset));
TRY(verify_head_index(head_vertical_buffer_offset.head_index));
if (head_vertical_buffer_offset.offsetted < 0 || head_vertical_buffer_offset.offsetted > 1)
return Error::from_errno(EINVAL);
TRY(set_head_buffer(head_vertical_buffer_offset.head_index, head_vertical_buffer_offset.offsetted));
return {};
}
case FB_IOCTL_GET_HEAD_VERTICAL_OFFSET_BUFFER: {
auto user_head_vertical_buffer_offset = static_ptr_cast<FBHeadVerticalOffset*>(arg);
FBHeadVerticalOffset head_vertical_buffer_offset {};
TRY(copy_from_user(&head_vertical_buffer_offset, user_head_vertical_buffer_offset));
TRY(verify_head_index(head_vertical_buffer_offset.head_index));
head_vertical_buffer_offset.offsetted = TRY(vertical_offsetted(head_vertical_buffer_offset.head_index));
return copy_to_user(user_head_vertical_buffer_offset, &head_vertical_buffer_offset);
}
case FB_IOCTL_FLUSH_HEAD_BUFFERS: {
if (!partial_flushing_support())
return Error::from_errno(ENOTSUP);
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);
SpinlockLocker locker(m_flushing_lock);
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]));
TRY(flush_rectangle(flush_rects.buffer_index, user_dirty_rect));
}
}
return {};
};
case FB_IOCTL_FLUSH_HEAD: {
if (!flushing_support())
return Error::from_errno(ENOTSUP);
// Note: We accept a FBRect, but we only really care about the head_index value.
auto user_rect = static_ptr_cast<FBRect const*>(arg);
auto rect = TRY(copy_typed_from_user(user_rect));
TRY(verify_head_index(rect.head_index));
TRY(flush_head_buffer(rect.head_index));
return {};
}
default:
return EINVAL;
};
}
GenericFramebufferDevice::GenericFramebufferDevice(const GenericGraphicsAdapter& adapter)
: BlockDevice(29, GraphicsManagement::the().allocate_minor_device_number())
, m_graphics_adapter(adapter)
{
}
}
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