From: "Alex Bennée" <alex.bennee@linaro.org>
To: Peter Maydell <peter.maydell@linaro.org>
Cc: "Philippe Mathieu-Daudé" <philmd@linaro.org>,
qemu-devel@nongnu.org,
"Marc-André Lureau" <marcandre.lureau@redhat.com>,
"Gavin Shan" <gshan@redhat.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Mark Cave-Ayland" <mark.cave-ayland@ilande.co.uk>,
"Evgeny Iakovlev" <eiakovlev@linux.microsoft.com>,
qemu-arm@nongnu.org
Subject: Re: [PATCH-for-8.2 v4 00/10] hw/char/pl011: Implement TX (async) FIFO to avoid blocking the main loop
Date: Fri, 24 Nov 2023 10:24:18 +0000 [thread overview]
Message-ID: <87jzq7cuul.fsf@draig.linaro.org> (raw)
In-Reply-To: <CAFEAcA_0BfGVDZWJUPs8hwYRKS8FmzppQgY+s83qxBXHjLJvnw@mail.gmail.com> (Peter Maydell's message of "Mon, 13 Nov 2023 13:11:22 +0000")
Peter Maydell <peter.maydell@linaro.org> writes:
> On Thu, 9 Nov 2023 at 20:59, Philippe Mathieu-Daudé <philmd@linaro.org> wrote:
>>
>> Hi Peter,
>>
>> On 9/11/23 20:29, Peter Maydell wrote:
>> > On Thu, 9 Nov 2023 at 19:28, Philippe Mathieu-Daudé <philmd@linaro.org> wrote:
>> >>
>> >> Missing review: #10
>> >>
>> >> Hi,
>> >>
>> >> This series add support for (async) FIFO on the transmit path
>> >> of the PL011 UART.
>> >
>> > Hi; what's the rationale for the "for-8.2" targeting here?
>> > What bug are we fixing?
>>
>> The bug is on Trusted Substrate when the ZynqMP machine is used:
>> https://linaro.atlassian.net/browse/TRS-149?focusedCommentId=149574
>
> And have we confirmed that the async FIFO support fixes that problem?
> That bug report seems to have mostly just speculation in it that
> maybe this XXX comment is why...
I've been fighting with numerous issues with the TRS build over the last
week so I can confirm I have seen a) a lock up with pl011_write blocking
everything under the BQL because data wasn't read fast enough and b) the
problem goes away with Philippe's patches. So have a:
Tested-by: Alex Bennée <alex.bennee@linaro.org>
for the series.
>
> -- PMM
--
Alex Bennée
Virtualisation Tech Lead @ Linaro
next prev parent reply other threads:[~2023-11-24 10:24 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-09 19:28 [PATCH-for-8.2 v4 00/10] hw/char/pl011: Implement TX (async) FIFO to avoid blocking the main loop Philippe Mathieu-Daudé
2023-11-09 19:28 ` [PATCH-for-8.2 v4 01/10] util/fifo8: Allow fifo8_pop_buf() to not populate popped length Philippe Mathieu-Daudé
2023-11-09 23:12 ` Richard Henderson
2023-11-09 19:28 ` [PATCH-for-8.2 v4 02/10] util/fifo8: Introduce fifo8_peek_buf() Philippe Mathieu-Daudé
2023-11-09 23:15 ` Richard Henderson
2023-11-09 19:28 ` [PATCH-for-8.2 v4 03/10] hw/char/pl011: Split RX/TX path of pl011_reset_fifo() Philippe Mathieu-Daudé
2023-11-09 19:28 ` [PATCH-for-8.2 v4 04/10] hw/char/pl011: Extract pl011_write_txdata() from pl011_write() Philippe Mathieu-Daudé
2023-11-09 23:17 ` Richard Henderson
2023-12-13 9:13 ` Philippe Mathieu-Daudé
2023-11-09 19:28 ` [PATCH-for-8.2 v4 05/10] hw/char/pl011: Extract pl011_read_rxdata() from pl011_read() Philippe Mathieu-Daudé
2023-11-09 19:28 ` [PATCH-for-8.2 v4 06/10] hw/char/pl011: Warn when using disabled transmitter Philippe Mathieu-Daudé
2023-11-09 19:28 ` [PATCH-for-8.2 v4 07/10] hw/char/pl011: Check if receiver is enabled Philippe Mathieu-Daudé
2023-11-09 19:28 ` [PATCH-for-8.2 v4 08/10] hw/char/pl011: Rename RX FIFO methods Philippe Mathieu-Daudé
2023-11-09 19:28 ` [PATCH-for-8.2 v4 09/10] hw/char/pl011: Add transmit FIFO to PL011State Philippe Mathieu-Daudé
2023-11-09 23:24 ` Richard Henderson
2023-11-16 15:48 ` Juan Quintela
2024-07-17 13:34 ` Philippe Mathieu-Daudé
2023-11-09 19:28 ` [PATCH-for-8.2 v4 10/10] hw/char/pl011: Implement TX FIFO Philippe Mathieu-Daudé
2023-11-09 23:34 ` Richard Henderson
2023-11-22 10:31 ` Marc-André Lureau
2023-11-22 10:38 ` Daniel P. Berrangé
2023-11-24 12:47 ` Philippe Mathieu-Daudé
2023-11-09 19:29 ` [PATCH-for-8.2 v4 00/10] hw/char/pl011: Implement TX (async) FIFO to avoid blocking the main loop Peter Maydell
2023-11-09 20:59 ` Philippe Mathieu-Daudé
2023-11-13 13:11 ` Peter Maydell
2023-11-13 15:44 ` Philippe Mathieu-Daudé
2023-11-24 10:24 ` Alex Bennée [this message]
2024-01-05 7:50 ` Mark Cave-Ayland
2024-01-10 7:05 ` Mark Cave-Ayland
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