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Kernel: Use DMA helper everywhere

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Port UCHI, AC97, SB16, BMIDEChannel and AHCIPort to use the helper to
allocate DMA buffers.
This commit is contained in:
Pankaj Raghav 2022-01-06 22:01:05 +05:30 • committed by Andreas Kling
parent 59da9bd0bd
commit 0a1b34c753
5 changed files with 13 additions and 33 deletions
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11
Kernel/Devices/Audio/AC97.cpp
View file

@ -20,13 +20,6 @@ static constexpr u16 pcm_fixed_sample_rate = 48000;
static constexpr u16 pcm_sample_rate_minimum = 8000;
static constexpr u16 pcm_sample_rate_maximum = 48000;
static ErrorOr<OwnPtr<Memory::Region>> allocate_physical_buffer(size_t size, StringView name)
{
auto rounded_size = TRY(Memory::page_round_up(size));
auto vmobject = TRY(Memory::AnonymousVMObject::try_create_physically_contiguous_with_size(rounded_size));
return TRY(MM.allocate_kernel_region_with_vmobject(move(vmobject), vmobject->size(), name, Memory::Region::Access::Write));
}
UNMAP_AFTER_INIT void AC97::detect()
{
PCI::enumerate([&](PCI::DeviceIdentifier const& device_identifier) {
@ -204,11 +197,11 @@ void AC97::set_pcm_output_volume(u8 left_channel, u8 right_channel, Muted mute)
ErrorOr<size_t> AC97::write(OpenFileDescription&, u64, UserOrKernelBuffer const& data, size_t length)
{
if (!m_output_buffer) {
m_output_buffer = TRY(allocate_physical_buffer(m_output_buffer_page_count * PAGE_SIZE, "AC97 Output buffer"sv));
m_output_buffer = TRY(MM.allocate_dma_buffer_pages(m_output_buffer_page_count * PAGE_SIZE, "AC97 Output buffer"sv, Memory::Region::Access::Write));
}
if (!m_buffer_descriptor_list) {
constexpr size_t buffer_descriptor_list_size = buffer_descriptor_list_max_entries * sizeof(BufferDescriptorListEntry);
m_buffer_descriptor_list = TRY(allocate_physical_buffer(buffer_descriptor_list_size, "AC97 Buffer Descriptor List"sv));
m_buffer_descriptor_list = TRY(MM.allocate_dma_buffer_pages(buffer_descriptor_list_size, "AC97 Buffer Descriptor List"sv, Memory::Region::Access::Write));
}
auto remaining = length;

7
Kernel/Devices/Audio/SB16.cpp
View file

@ -252,12 +252,7 @@ void SB16::wait_for_irq()
ErrorOr<size_t> SB16::write(OpenFileDescription&, u64, UserOrKernelBuffer const& data, size_t length)
{
if (!m_dma_region) {
auto page = MM.allocate_supervisor_physical_page();
if (!page)
return ENOMEM;
auto nonnull_page = page.release_nonnull();
auto vmobject = TRY(Memory::AnonymousVMObject::try_create_with_physical_pages({ &nonnull_page, 1 }));
m_dma_region = TRY(MM.allocate_kernel_region_with_vmobject(move(vmobject), PAGE_SIZE, "SB16 DMA buffer", Memory::Region::Access::Write));
m_dma_region = TRY(MM.allocate_dma_buffer_page("SB16 DMA buffer", Memory::Region::Access::Write));
}
dbgln_if(SB16_DEBUG, "SB16: Writing buffer of {} bytes", length);