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Kernel: Enable IRQs before sending commands to devices

Browse source 
Without this fix, a very fast IRQ can preempt the enable_irq() call,
leaving that IRQ being unhandled.
This commit is contained in:
Liav A 2020-03-06 03:22:53 +02:00 committed by Andreas Kling
parent f33fb151b4
commit a3fa40fc07
Notes: sideshowbarker 2024-07-19 08:52:53 +09:00 
Author: https://github.com/supercomputer7
Commit: https://github.com/SerenityOS/serenity/commit/a3fa40fc07e
Pull-request: https://github.com/SerenityOS/serenity/pull/1355
Reviewed-by: https://github.com/awesomekling
3 changed files with 19 additions and 8 deletions
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20
Kernel/Devices/PATAChannel.cpp
View file

@ -140,15 +140,21 @@ PATAChannel::PATAChannel(PCI::Address address, ChannelType type, bool force_pio)
ProcFS::add_sys_bool("ide_dma", m_dma_enabled);
m_prdt_page = MM.allocate_supervisor_physical_page();
initialize(force_pio);
detect_disks();
disable_irq();
}
PATAChannel::~PATAChannel()
{
}
void PATAChannel::prepare_for_irq()
{
cli();
enable_irq();
}
void PATAChannel::initialize(bool force_pio)
{
@ -158,6 +164,7 @@ void PATAChannel::initialize(bool force_pio)
}
// Let's try to set up DMA transfers.
PCI::enable_bus_mastering(pci_address());
PCI::enable_interrupt_line(pci_address());
prdt().end_of_table = 0x8000;
m_dma_buffer_page = MM.allocate_supervisor_physical_page();
klog() << "PATAChannel: Bus master IDE: " << m_bus_master_base;
@ -170,8 +177,6 @@ static void print_ide_status(u8 status)
void PATAChannel::wait_for_irq()
{
cli();
enable_irq();
Thread::current->wait_on(m_irq_queue);
disable_irq();
}
@ -313,6 +318,7 @@ bool PATAChannel::ata_read_sectors_with_dma(u32 lba, u16 count, u8* outbuf, bool
m_io_base.offset(ATA_REG_COMMAND).out<u8>(ATA_CMD_READ_DMA_EXT);
io_delay();
prepare_for_irq();
// Start bus master
m_bus_master_base.out<u8>(0x9);
@ -383,9 +389,9 @@ bool PATAChannel::ata_write_sectors_with_dma(u32 lba, u16 count, const u8* inbuf
m_io_base.offset(ATA_REG_COMMAND).out<u8>(ATA_CMD_WRITE_DMA_EXT);
io_delay();
prepare_for_irq();
// Start bus master
m_bus_master_base.out<u8>(0x1);
wait_for_irq();
if (m_device_error)
@ -425,6 +431,7 @@ bool PATAChannel::ata_read_sectors(u32 start_sector, u16 count, u8* outbuf, bool
while (!(m_io_base.offset(ATA_REG_STATUS).in<u8>() & ATA_SR_DRDY))
;
prepare_for_irq();
m_io_base.offset(ATA_REG_COMMAND).out<u8>(ATA_CMD_READ_PIO);
wait_for_irq();
@ -440,7 +447,7 @@ bool PATAChannel::ata_read_sectors(u32 start_sector, u16 count, u8* outbuf, bool
u8 status = m_io_base.offset(ATA_REG_STATUS).in<u8>();
ASSERT(status & ATA_SR_DRQ);
#ifdef PATA_DEBUG
dbg() << "PATAChannel: Retrieving 512 bytes (part " << i << ") (status=" << String::format("%b", status) << "), outbuf=(" << (inbuf + (512 * i)) << ")...";
dbg() << "PATAChannel: Retrieving 512 bytes (part " << i << ") (status=" << String::format("%b", status) << "), outbuf=(" << (outbuf + (512 * i)) << ")...";
#endif
IO::repeated_in16(m_io_base.offset(ATA_REG_DATA).get(), outbuf + (512 * i), 256);
@ -493,11 +500,12 @@ bool PATAChannel::ata_write_sectors(u32 start_sector, u16 count, const u8* inbuf
#endif
IO::repeated_out16(m_io_base.offset(ATA_REG_DATA).get(), inbuf + (512 * i), 256);
prepare_for_irq();
wait_for_irq();
status = m_io_base.offset(ATA_REG_STATUS).in<u8>();
ASSERT(!(status & ATA_SR_BSY));
}
prepare_for_irq();
m_io_base.offset(ATA_REG_COMMAND).out<u8>(ATA_CMD_CACHE_FLUSH);
wait_for_irq();
u8 status = m_io_base.offset(ATA_REG_STATUS).in<u8>();

2
Kernel/Devices/PATAChannel.h
View file

@ -85,6 +85,8 @@ private:
bool ata_read_sectors(u32, u16, u8*, bool);
bool ata_write_sectors(u32, u16, const u8*, bool);
inline void prepare_for_irq();
// Data members
u8 m_channel_number { 0 }; // Channel number. 0 = master, 1 = slave
IOAddress m_io_base;

5
Kernel/Devices/SB16.cpp
View file

@ -220,8 +220,6 @@ void SB16::handle_irq(RegisterState&)
void SB16::wait_for_irq()
{
cli();
enable_irq();
Thread::current->wait_on(m_irq_queue);
disable_irq();
}
@ -260,6 +258,9 @@ ssize_t SB16::write(FileDescription&, const u8* data, ssize_t length)
sample_count -= 1;
cli();
enable_irq();
dsp_write(command);
dsp_write(mode);
dsp_write((u8)sample_count);