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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/Singleton.h>
#include <Kernel/Debug.h>
#include <Kernel/Graphics/FramebufferDevice.h>
#include <Kernel/Graphics/GraphicsManagement.h>
#include <Kernel/Panic.h>
#include <Kernel/Process.h>
#include <Kernel/Sections.h>
#include <Kernel/VM/AnonymousVMObject.h>
#include <Kernel/VM/MemoryManager.h>
#include <Kernel/VM/TypedMapping.h>
#include <LibC/errno_numbers.h>
#include <LibC/sys/ioctl_numbers.h>
#define MAX_RESOLUTION_WIDTH 4096
#define MAX_RESOLUTION_HEIGHT 2160
namespace Kernel {
NonnullRefPtr<FramebufferDevice> FramebufferDevice::create(const GraphicsDevice& adapter, size_t output_port_index, PhysicalAddress paddr, size_t width, size_t height, size_t pitch)
{
return adopt_ref(*new FramebufferDevice(adapter, output_port_index, paddr, width, height, pitch));
}
KResultOr<Region*> FramebufferDevice::mmap(Process& process, FileDescription&, const Range& range, u64 offset, int prot, bool shared)
{
ScopedSpinLock lock(m_activation_lock);
REQUIRE_PROMISE(video);
if (!shared)
return ENODEV;
if (offset != 0)
return ENXIO;
if (range.size() != page_round_up(framebuffer_size_in_bytes()))
return EOVERFLOW;
auto vmobject = AnonymousVMObject::create_for_physical_range(m_framebuffer_address, page_round_up(framebuffer_size_in_bytes()));
if (!vmobject)
return ENOMEM;
m_userspace_real_framebuffer_vmobject = vmobject;
m_real_framebuffer_vmobject = AnonymousVMObject::create_for_physical_range(m_framebuffer_address, page_round_up(framebuffer_size_in_bytes()));
m_swapped_framebuffer_vmobject = AnonymousVMObject::create_with_size(page_round_up(framebuffer_size_in_bytes()), AllocationStrategy::AllocateNow);
m_real_framebuffer_region = MM.allocate_kernel_region_with_vmobject(*m_real_framebuffer_vmobject, page_round_up(framebuffer_size_in_bytes()), "Framebuffer", Region::Access::Read | Region::Access::Write);
m_swapped_framebuffer_region = MM.allocate_kernel_region_with_vmobject(*m_swapped_framebuffer_vmobject, page_round_up(framebuffer_size_in_bytes()), "Framebuffer Swap (Blank)", Region::Access::Read | Region::Access::Write);
RefPtr<VMObject> chosen_vmobject;
if (m_graphical_writes_enabled) {
chosen_vmobject = m_real_framebuffer_vmobject;
} else {
chosen_vmobject = m_swapped_framebuffer_vmobject;
}
auto result = process.space().allocate_region_with_vmobject(
range,
chosen_vmobject.release_nonnull(),
0,
"Framebuffer",
prot,
shared);
if (!result.is_error()) {
m_userspace_framebuffer_region = result.value();
}
return result;
}
void FramebufferDevice::deactivate_writes()
{
ScopedSpinLock lock(m_activation_lock);
if (!m_userspace_framebuffer_region)
return;
memcpy(m_swapped_framebuffer_region->vaddr().as_ptr(), m_real_framebuffer_region->vaddr().as_ptr(), page_round_up(framebuffer_size_in_bytes()));
auto vmobject = m_swapped_framebuffer_vmobject;
m_userspace_framebuffer_region->set_vmobject(vmobject.release_nonnull());
m_userspace_framebuffer_region->remap();
m_graphical_writes_enabled = false;
}
void FramebufferDevice::activate_writes()
{
ScopedSpinLock lock(m_activation_lock);
if (!m_userspace_framebuffer_region || !m_real_framebuffer_vmobject)
return;
// restore the image we had in the void area
// FIXME: if we happen to have multiple Framebuffers that are writing to that location
// we will experience glitches...
memcpy(m_real_framebuffer_region->vaddr().as_ptr(), m_swapped_framebuffer_region->vaddr().as_ptr(), page_round_up(framebuffer_size_in_bytes()));
auto vmobject = m_userspace_real_framebuffer_vmobject;
m_userspace_framebuffer_region->set_vmobject(vmobject.release_nonnull());
m_userspace_framebuffer_region->remap();
m_graphical_writes_enabled = true;
}
String FramebufferDevice::device_name() const
{
return String::formatted("fb{}", minor());
}
UNMAP_AFTER_INIT void FramebufferDevice::initialize()
{
m_real_framebuffer_vmobject = AnonymousVMObject::create_for_physical_range(m_framebuffer_address, page_round_up(framebuffer_size_in_bytes()));
VERIFY(m_real_framebuffer_vmobject);
m_real_framebuffer_region = MM.allocate_kernel_region_with_vmobject(*m_real_framebuffer_vmobject, page_round_up(framebuffer_size_in_bytes()), "Framebuffer", Region::Access::Read | Region::Access::Write);
VERIFY(m_real_framebuffer_region);
m_swapped_framebuffer_vmobject = AnonymousVMObject::create_with_size(page_round_up(framebuffer_size_in_bytes()), AllocationStrategy::AllocateNow);
VERIFY(m_swapped_framebuffer_vmobject);
m_swapped_framebuffer_region = MM.allocate_kernel_region_with_vmobject(*m_swapped_framebuffer_vmobject, page_round_up(framebuffer_size_in_bytes()), "Framebuffer Swap (Blank)", Region::Access::Read | Region::Access::Write);
VERIFY(m_swapped_framebuffer_region);
}
UNMAP_AFTER_INIT FramebufferDevice::FramebufferDevice(const GraphicsDevice& adapter, size_t output_port_index, PhysicalAddress addr, size_t width, size_t height, size_t pitch)
: BlockDevice(29, GraphicsManagement::the().allocate_minor_device_number())
, m_framebuffer_address(addr)
, m_framebuffer_pitch(pitch)
, m_framebuffer_width(width)
, m_framebuffer_height(height)
, m_output_port_index(output_port_index)
, m_graphics_adapter(adapter)
{
VERIFY(!m_framebuffer_address.is_null());
VERIFY(m_framebuffer_pitch);
VERIFY(m_framebuffer_width);
VERIFY(m_framebuffer_height);
dbgln("Framebuffer {}: address={}, pitch={}, width={}, height={}", minor(), addr, pitch, width, height);
}
size_t FramebufferDevice::framebuffer_size_in_bytes() const
{
if (m_graphics_adapter->double_framebuffering_capable())
return m_framebuffer_pitch * m_framebuffer_height * 2;
return m_framebuffer_pitch * m_framebuffer_height;
}
int FramebufferDevice::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 = framebuffer_size_in_bytes();
if (!copy_to_user(out, &value))
return -EFAULT;
return 0;
}
case FB_IOCTL_GET_BUFFER: {
auto* index = (int*)arg;
int value = m_y_offset == 0 ? 0 : 1;
if (!copy_to_user(index, &value))
return -EFAULT;
if (!m_graphics_adapter->double_framebuffering_capable())
return -ENOTIMPL;
return 0;
}
case FB_IOCTL_SET_BUFFER: {
if (arg != 0 && arg != 1)
return -EINVAL;
if (!m_graphics_adapter->double_framebuffering_capable())
return -ENOTIMPL;
m_graphics_adapter->set_y_offset(m_output_port_index, arg == 0 ? 0 : m_framebuffer_height);
return 0;
}
case FB_IOCTL_GET_RESOLUTION: {
auto* user_resolution = (FBResolution*)arg;
FBResolution resolution;
resolution.pitch = m_framebuffer_pitch;
resolution.width = m_framebuffer_width;
resolution.height = m_framebuffer_height;
if (!copy_to_user(user_resolution, &resolution))
return -EFAULT;
return 0;
}
case FB_IOCTL_SET_RESOLUTION: {
auto* user_resolution = (FBResolution*)arg;
FBResolution resolution;
if (!copy_from_user(&resolution, user_resolution))
return -EFAULT;
if (resolution.width > MAX_RESOLUTION_WIDTH || resolution.height > MAX_RESOLUTION_HEIGHT)
return -EINVAL;
if (!m_graphics_adapter->modesetting_capable()) {
resolution.pitch = m_framebuffer_pitch;
resolution.width = m_framebuffer_width;
resolution.height = m_framebuffer_height;
if (!copy_to_user(user_resolution, &resolution))
return -EFAULT;
return -ENOTIMPL;
}
if (!m_graphics_adapter->try_to_set_resolution(m_output_port_index, resolution.width, resolution.height)) {
m_framebuffer_pitch = m_framebuffer_width * sizeof(u32);
dbgln_if(FRAMEBUFFER_DEVICE_DEBUG, "Reverting resolution: [{}x{}]", m_framebuffer_width, m_framebuffer_height);
// Note: We try to revert everything back, and if it doesn't work, just assert.
if (!m_graphics_adapter->try_to_set_resolution(m_output_port_index, m_framebuffer_width, m_framebuffer_height)) {
VERIFY_NOT_REACHED();
}
resolution.pitch = m_framebuffer_pitch;
resolution.width = m_framebuffer_width;
resolution.height = m_framebuffer_height;
if (!copy_to_user(user_resolution, &resolution))
return -EFAULT;
return -EINVAL;
}
m_framebuffer_width = resolution.width;
m_framebuffer_height = resolution.height;
m_framebuffer_pitch = m_framebuffer_width * sizeof(u32);
dbgln_if(FRAMEBUFFER_DEVICE_DEBUG, "New resolution: [{}x{}]", m_framebuffer_width, m_framebuffer_height);
resolution.pitch = m_framebuffer_pitch;
resolution.width = m_framebuffer_width;
resolution.height = m_framebuffer_height;
if (!copy_to_user(user_resolution, &resolution))
return -EFAULT;
return 0;
}
case FB_IOCTL_GET_BUFFER_OFFSET: {
FBBufferOffset buffer_offset;
if (!copy_from_user(&buffer_offset, (FBBufferOffset*)arg))
return -EFAULT;
if (buffer_offset.buffer_index != 0 && buffer_offset.buffer_index != 1)
return -EINVAL;
buffer_offset.offset = (size_t)buffer_offset.buffer_index * m_framebuffer_pitch * m_framebuffer_height;
if (!copy_to_user((FBBufferOffset*)arg, &buffer_offset))
return -EFAULT;
return 0;
}
case FB_IOCTL_FLUSH_BUFFERS:
return -ENOTSUP;
default:
return -EINVAL;
};
}
}
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