From: Alistair Francis <alistair23@gmail.com> To: Bin Meng <bmeng.cn@gmail.com> Cc: "open list:RISC-V" <qemu-riscv@nongnu.org>, "Frank Chang" <frank.chang@sifive.com>, "qemu-devel@nongnu.org Developers" <qemu-devel@nongnu.org>, "Markus Armbruster" <armbru@redhat.com>, "Alistair Francis" <Alistair.Francis@wdc.com>, "Philippe Mathieu-Daudé" <f4bug@amsat.org> Subject: Re: [PATCH v2 1/2] hw/dma: sifive_pdma: Fix Control.claim bit detection Date: Wed, 29 Sep 2021 08:45:12 +1000 [thread overview] Message-ID: <CAKmqyKPG_QPb+uDprW-C5W_ush-4j7TbAAkpB_61NGPh7P76Aw@mail.gmail.com> (raw) In-Reply-To: <20210927072124.1564129-1-bmeng.cn@gmail.com> On Mon, Sep 27, 2021 at 5:21 PM Bin Meng <bmeng.cn@gmail.com> wrote: > > At present the codes detect whether the DMA channel is claimed by: > > claimed = !!s->chan[ch].control & CONTROL_CLAIM; > > As ! has higher precedence over & (bitwise and), this is essentially > > claimed = (!!s->chan[ch].control) & CONTROL_CLAIM; > > which is wrong, as any non-zero bit set in the control register will > produce a result of a claimed channel. > > Fixes: de7c7988d25d ("hw/dma: sifive_pdma: reset Next* registers when Control.claim is set") > Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Alistair > > --- > > Changes in v2: > - reword the commit message > > hw/dma/sifive_pdma.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/hw/dma/sifive_pdma.c b/hw/dma/sifive_pdma.c > index b4fd40573a..b8ec7621f3 100644 > --- a/hw/dma/sifive_pdma.c > +++ b/hw/dma/sifive_pdma.c > @@ -243,7 +243,7 @@ static void sifive_pdma_write(void *opaque, hwaddr offset, > offset &= 0xfff; > switch (offset) { > case DMA_CONTROL: > - claimed = !!s->chan[ch].control & CONTROL_CLAIM; > + claimed = !!(s->chan[ch].control & CONTROL_CLAIM); > > if (!claimed && (value & CONTROL_CLAIM)) { > /* reset Next* registers */ > -- > 2.25.1 > >
WARNING: multiple messages have this Message-ID (diff)
From: Alistair Francis <alistair23@gmail.com> To: Bin Meng <bmeng.cn@gmail.com> Cc: "Alistair Francis" <Alistair.Francis@wdc.com>, "qemu-devel@nongnu.org Developers" <qemu-devel@nongnu.org>, "open list:RISC-V" <qemu-riscv@nongnu.org>, "Frank Chang" <frank.chang@sifive.com>, "Philippe Mathieu-Daudé" <f4bug@amsat.org>, "Markus Armbruster" <armbru@redhat.com> Subject: Re: [PATCH v2 1/2] hw/dma: sifive_pdma: Fix Control.claim bit detection Date: Wed, 29 Sep 2021 08:45:12 +1000 [thread overview] Message-ID: <CAKmqyKPG_QPb+uDprW-C5W_ush-4j7TbAAkpB_61NGPh7P76Aw@mail.gmail.com> (raw) In-Reply-To: <20210927072124.1564129-1-bmeng.cn@gmail.com> On Mon, Sep 27, 2021 at 5:21 PM Bin Meng <bmeng.cn@gmail.com> wrote: > > At present the codes detect whether the DMA channel is claimed by: > > claimed = !!s->chan[ch].control & CONTROL_CLAIM; > > As ! has higher precedence over & (bitwise and), this is essentially > > claimed = (!!s->chan[ch].control) & CONTROL_CLAIM; > > which is wrong, as any non-zero bit set in the control register will > produce a result of a claimed channel. > > Fixes: de7c7988d25d ("hw/dma: sifive_pdma: reset Next* registers when Control.claim is set") > Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Alistair > > --- > > Changes in v2: > - reword the commit message > > hw/dma/sifive_pdma.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/hw/dma/sifive_pdma.c b/hw/dma/sifive_pdma.c > index b4fd40573a..b8ec7621f3 100644 > --- a/hw/dma/sifive_pdma.c > +++ b/hw/dma/sifive_pdma.c > @@ -243,7 +243,7 @@ static void sifive_pdma_write(void *opaque, hwaddr offset, > offset &= 0xfff; > switch (offset) { > case DMA_CONTROL: > - claimed = !!s->chan[ch].control & CONTROL_CLAIM; > + claimed = !!(s->chan[ch].control & CONTROL_CLAIM); > > if (!claimed && (value & CONTROL_CLAIM)) { > /* reset Next* registers */ > -- > 2.25.1 > >
next prev parent reply other threads:[~2021-09-28 22:48 UTC|newest] Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-09-27 7:21 [PATCH v2 1/2] hw/dma: sifive_pdma: Fix Control.claim bit detection Bin Meng 2021-09-27 7:21 ` [PATCH v2 2/2] hw/dma: sifive_pdma: Don't run DMA when channel is disclaimed Bin Meng 2021-09-28 22:46 ` Alistair Francis 2021-09-28 22:46 ` Alistair Francis 2021-09-28 23:15 ` Alistair Francis 2021-09-28 23:15 ` Alistair Francis 2021-09-27 12:56 ` [PATCH v2 1/2] hw/dma: sifive_pdma: Fix Control.claim bit detection Philippe Mathieu-Daudé 2021-09-27 13:14 ` Bin Meng 2021-09-27 13:14 ` Bin Meng 2021-09-28 22:45 ` Alistair Francis [this message] 2021-09-28 22:45 ` Alistair Francis
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=CAKmqyKPG_QPb+uDprW-C5W_ush-4j7TbAAkpB_61NGPh7P76Aw@mail.gmail.com \ --to=alistair23@gmail.com \ --cc=Alistair.Francis@wdc.com \ --cc=armbru@redhat.com \ --cc=bmeng.cn@gmail.com \ --cc=f4bug@amsat.org \ --cc=frank.chang@sifive.com \ --cc=qemu-devel@nongnu.org \ --cc=qemu-riscv@nongnu.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.