[PATCH v5 00/16] hw/char/pl011: Implement TX (async) FIFO to avoid blocking the main loop

[Philippe Mathieu-Daudé]

Hi,

This series add support for (async) FIFO on the transmit path
of the PL011 UART.

Last patch still broken (chars are emitted async),
still patches 1-11 could be merged for this release...

Since v4:
- Rebased (loopback)
- Addressed Richard & Juan migration comments
- Split in smaller patches

Since v3:
- Document migration bits (Alex, Richard)
- Just check FIFO is not empty in pl011_xmit_fifo_state_needed (rth)
- In pl011_xmit check TX enabled first, and ignore < 8-bit TX (rth)

Since v2:
- Added R-b tags
- Addressed Richard comments on migration

Since v1:
- Restrict pl011_ops[] impl access_size,
- Do not check transmitter is enabled (Peter),
- Addressed Alex's review comments,
- Simplified migration trying to care about backward compat,
  but still unsure...

Philippe Mathieu-Daudé (16):
  tests/avocado: Add 'device:pl011' tag to tests exercising PL011 UART
  hw/char/pl011: Remove unused 'readbuff' field
  hw/char/pl011: Move pl011_put_fifo() earlier
  hw/char/pl011: Move pl011_loopback_enabled|tx() around
  hw/char/pl011: Split RX/TX path of pl011_reset_fifo()
  hw/char/pl011: Extract pl011_write_txdata() from pl011_write()
  hw/char/pl011: Extract pl011_read_rxdata() from pl011_read()
  hw/char/pl011: Warn when using disabled transmitter
  tests/qtest: Update tests using PL011 UART
  hw/char/pl011: Check if receiver is enabled
  hw/char/pl011: Rename RX FIFO methods
  hw/char/pl011: Add transmit FIFO to PL011State
  hw/char/pl011: Introduce pl011_xmit() as GSource
  hw/char/pl011: Consider TX FIFO overrun error
  hw/char/pl011: Drain TX FIFO when no backend connected
  hw/char/pl011: Implement TX FIFO

 include/hw/char/pl011.h                  |   3 +-
 hw/char/pl011.c                          | 339 ++++++++++++++++-------
 tests/qtest/boot-serial-test.c           |  15 +-
 hw/char/trace-events                     |   9 +-
 tests/avocado/boot_linux.py              |   1 +
 tests/avocado/boot_linux_console.py      |   2 +
 tests/avocado/boot_xen.py                |   1 +
 tests/avocado/machine_aarch64_sbsaref.py |   1 +
 tests/avocado/machine_aarch64_virt.py    |   1 +
 tests/avocado/smmu.py                    |   1 +
 tests/avocado/tuxrun_baselines.py        |   5 +
 11 files changed, 277 insertions(+), 101 deletions(-)

-- 
2.41.0