From: Linus Torvalds <torvalds@linux-foundation.org>
To: David Laight <David.Laight@aculab.com>
Cc: "Toke Høiland-Jørgensen" <toke@toke.dk>,
"Halil Pasic" <pasic@linux.ibm.com>,
"Robin Murphy" <robin.murphy@arm.com>,
"Maxime Bizon" <mbizon@freebox.fr>,
Netdev <netdev@vger.kernel.org>, "Kalle Valo" <kvalo@kernel.org>,
linux-wireless <linux-wireless@vger.kernel.org>,
"Oleksandr Natalenko" <oleksandr@natalenko.name>,
stable <stable@vger.kernel.org>,
"David S. Miller" <davem@davemloft.net>,
iommu <iommu@lists.linux-foundation.org>,
"Olha Cherevyk" <olha.cherevyk@gmail.com>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Jakub Kicinski" <kuba@kernel.org>,
"Paolo Abeni" <pabeni@redhat.com>,
"Christoph Hellwig" <hch@lst.de>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>
Subject: Re: [REGRESSION] Recent swiotlb DMA_FROM_DEVICE fixes break ath9k-based AP
Date: Sat, 26 Mar 2022 15:41:40 -0700 [thread overview]
Message-ID: <CAHk-=wgqHqb_yaNUGwMfLJJw28VvauSB6sSMCi3Bu7Q0-N0GEQ@mail.gmail.com> (raw)
In-Reply-To: <d9fbd3ab9b514b0d8121d4d7d21662a6@AcuMS.aculab.com>
On Sat, Mar 26, 2022 at 3:38 PM David Laight <David.Laight@aculab.com> wrote:
>
> Is the idea of 'buffer ownership' even a good one?
I do think it might be best to not think in those terms, but literally
just in data movement terms.
Because the "buffer ownership" mental model is clearly confused, when
data transfer might be ongoing, but the CPU might need to just look at
"what's going on right now" without actually taking any ownership of
the buffer.
Linus
WARNING: multiple messages have this Message-ID (diff)
From: Linus Torvalds <torvalds@linux-foundation.org>
To: David Laight <David.Laight@aculab.com>
Cc: "Toke Høiland-Jørgensen" <toke@toke.dk>,
Netdev <netdev@vger.kernel.org>, "Kalle Valo" <kvalo@kernel.org>,
linux-wireless <linux-wireless@vger.kernel.org>,
"Oleksandr Natalenko" <oleksandr@natalenko.name>,
stable <stable@vger.kernel.org>, "Christoph Hellwig" <hch@lst.de>,
"Halil Pasic" <pasic@linux.ibm.com>,
"Jakub Kicinski" <kuba@kernel.org>,
iommu <iommu@lists.linux-foundation.org>,
"Olha Cherevyk" <olha.cherevyk@gmail.com>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Maxime Bizon" <mbizon@freebox.fr>,
"Paolo Abeni" <pabeni@redhat.com>,
"Robin Murphy" <robin.murphy@arm.com>,
"David S. Miller" <davem@davemloft.net>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>
Subject: Re: [REGRESSION] Recent swiotlb DMA_FROM_DEVICE fixes break ath9k-based AP
Date: Sat, 26 Mar 2022 15:41:40 -0700 [thread overview]
Message-ID: <CAHk-=wgqHqb_yaNUGwMfLJJw28VvauSB6sSMCi3Bu7Q0-N0GEQ@mail.gmail.com> (raw)
In-Reply-To: <d9fbd3ab9b514b0d8121d4d7d21662a6@AcuMS.aculab.com>
On Sat, Mar 26, 2022 at 3:38 PM David Laight <David.Laight@aculab.com> wrote:
>
> Is the idea of 'buffer ownership' even a good one?
I do think it might be best to not think in those terms, but literally
just in data movement terms.
Because the "buffer ownership" mental model is clearly confused, when
data transfer might be ongoing, but the CPU might need to just look at
"what's going on right now" without actually taking any ownership of
the buffer.
Linus
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next prev parent reply other threads:[~2022-03-26 22:42 UTC|newest]
Thread overview: 139+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-23 7:19 [REGRESSION] Recent swiotlb DMA_FROM_DEVICE fixes break ath9k-based AP Oleksandr Natalenko
2022-03-23 7:19 ` Oleksandr Natalenko via iommu
2022-03-23 7:28 ` Kalle Valo
2022-03-23 7:28 ` Kalle Valo
2022-03-23 17:27 ` Linus Torvalds
2022-03-23 17:27 ` Linus Torvalds
2022-03-23 19:06 ` Robin Murphy
2022-03-23 19:06 ` Robin Murphy
2022-03-23 19:16 ` Linus Torvalds
2022-03-23 19:16 ` Linus Torvalds
2022-03-23 20:54 ` Robin Murphy
2022-03-23 20:54 ` Robin Murphy
2022-03-24 5:57 ` Christoph Hellwig
2022-03-24 5:57 ` Christoph Hellwig
2022-03-24 10:25 ` Oleksandr Natalenko
2022-03-24 10:25 ` Oleksandr Natalenko via iommu
2022-03-24 11:05 ` Robin Murphy
2022-03-24 11:05 ` Robin Murphy
2022-03-24 14:27 ` Toke Høiland-Jørgensen
2022-03-24 14:27 ` Toke Høiland-Jørgensen via iommu
2022-03-24 16:29 ` Maxime Bizon
2022-03-24 16:29 ` Maxime Bizon
2022-03-24 16:31 ` Christoph Hellwig
2022-03-24 16:31 ` Christoph Hellwig
2022-03-24 16:52 ` Robin Murphy
2022-03-24 16:52 ` Robin Murphy
2022-03-24 17:07 ` Toke Høiland-Jørgensen
2022-03-24 17:07 ` Toke Høiland-Jørgensen via iommu
2022-03-24 19:26 ` Linus Torvalds
2022-03-24 19:26 ` Linus Torvalds
2022-03-24 21:14 ` Toke Høiland-Jørgensen
2022-03-24 21:14 ` Toke Høiland-Jørgensen via iommu
2022-03-25 10:25 ` Maxime Bizon
2022-03-25 10:25 ` Maxime Bizon
2022-03-25 11:27 ` Robin Murphy
2022-03-25 11:27 ` Robin Murphy
2022-03-25 23:38 ` Halil Pasic
2022-03-25 23:38 ` Halil Pasic
2022-03-26 16:05 ` Toke Høiland-Jørgensen
2022-03-26 16:05 ` Toke Høiland-Jørgensen via iommu
2022-03-26 18:38 ` Linus Torvalds
2022-03-26 18:38 ` Linus Torvalds
2022-03-26 22:38 ` David Laight
2022-03-26 22:38 ` David Laight
2022-03-26 22:41 ` Linus Torvalds [this message]
2022-03-26 22:41 ` Linus Torvalds
2022-03-25 16:25 ` Toke Høiland-Jørgensen
2022-03-25 16:25 ` Toke Høiland-Jørgensen via iommu
2022-03-25 16:45 ` Robin Murphy
2022-03-25 16:45 ` Robin Murphy
2022-03-25 18:13 ` Toke Høiland-Jørgensen via iommu
2022-03-25 18:13 ` Toke Høiland-Jørgensen
2022-03-25 18:30 ` Linus Torvalds
2022-03-25 18:30 ` Linus Torvalds
2022-03-25 19:14 ` Robin Murphy
2022-03-25 19:14 ` Robin Murphy
2022-03-25 19:21 ` Linus Torvalds
2022-03-25 19:21 ` Linus Torvalds
2022-03-25 19:26 ` Oleksandr Natalenko via iommu
2022-03-25 19:26 ` Oleksandr Natalenko
2022-03-25 19:27 ` Linus Torvalds
2022-03-25 19:27 ` Linus Torvalds
2022-03-25 19:35 ` Oleksandr Natalenko via iommu
2022-03-25 19:35 ` Oleksandr Natalenko
2022-03-25 20:37 ` Johannes Berg
2022-03-25 20:37 ` Johannes Berg
2022-03-25 20:47 ` Linus Torvalds
2022-03-25 20:47 ` Linus Torvalds
2022-03-25 21:13 ` Johannes Berg
2022-03-25 21:13 ` Johannes Berg
2022-03-25 21:40 ` David Laight
2022-03-25 21:40 ` David Laight
2022-03-25 21:56 ` Linus Torvalds
2022-03-25 21:56 ` Linus Torvalds
2022-03-25 22:41 ` David Laight
2022-03-25 22:41 ` David Laight
2022-03-27 3:15 ` Halil Pasic
2022-03-27 3:15 ` Halil Pasic
2022-03-28 9:48 ` Johannes Berg
2022-03-28 9:48 ` Johannes Berg
2022-03-28 9:50 ` Johannes Berg
2022-03-28 9:50 ` Johannes Berg
2022-03-28 9:57 ` Johannes Berg
2022-03-28 9:57 ` Johannes Berg
2022-03-27 3:48 ` Halil Pasic
2022-03-27 3:48 ` Halil Pasic
2022-03-27 5:06 ` Linus Torvalds
2022-03-27 5:06 ` Linus Torvalds
2022-03-27 5:21 ` Linus Torvalds
2022-03-27 5:21 ` Linus Torvalds
2022-03-27 15:24 ` David Laight
2022-03-27 15:24 ` David Laight
2022-03-27 19:23 ` Linus Torvalds
2022-03-27 19:23 ` Linus Torvalds
2022-03-27 20:04 ` Linus Torvalds
2022-03-27 20:04 ` Linus Torvalds
2022-03-27 23:52 ` Halil Pasic
2022-03-27 23:52 ` Halil Pasic
2022-03-28 0:30 ` Linus Torvalds
2022-03-28 0:30 ` Linus Torvalds
2022-03-28 12:02 ` Halil Pasic
2022-03-28 12:02 ` Halil Pasic
2022-03-27 23:37 ` Halil Pasic
2022-03-27 23:37 ` Halil Pasic
2022-03-28 0:37 ` Linus Torvalds
2022-03-28 0:37 ` Linus Torvalds
2022-03-25 7:12 ` Oleksandr Natalenko
2022-03-25 7:12 ` Oleksandr Natalenko via iommu
2022-03-25 9:21 ` Thorsten Leemhuis
2022-03-25 9:21 ` Thorsten Leemhuis
2022-03-24 18:31 ` Halil Pasic
2022-03-24 18:31 ` Halil Pasic
2022-03-25 16:31 ` Christoph Hellwig
2022-03-25 16:31 ` Christoph Hellwig
2022-03-24 18:02 ` Halil Pasic
2022-03-24 18:02 ` Halil Pasic
2022-03-25 15:25 ` Halil Pasic
2022-03-25 15:25 ` Halil Pasic
2022-03-25 16:23 ` Robin Murphy
2022-03-25 16:23 ` Robin Murphy
2022-03-25 16:32 ` Christoph Hellwig
2022-03-25 16:32 ` Christoph Hellwig
2022-03-25 18:15 ` Toke Høiland-Jørgensen via iommu
2022-03-25 18:15 ` Toke Høiland-Jørgensen
2022-03-25 18:42 ` Robin Murphy
2022-03-25 18:42 ` Robin Murphy
2022-03-25 18:46 ` Linus Torvalds
2022-03-25 18:46 ` Linus Torvalds
2022-03-28 6:37 ` Christoph Hellwig
2022-03-28 6:37 ` Christoph Hellwig
2022-03-28 8:15 ` David Laight
2022-03-28 8:15 ` David Laight
2022-03-30 12:11 ` Halil Pasic
2022-03-30 12:11 ` Halil Pasic
2022-03-24 8:55 ` Oleksandr Natalenko
2022-03-24 8:55 ` Oleksandr Natalenko via iommu
2022-03-24 12:32 ` [REGRESSION] Recent swiotlb DMA_FROM_DEVICE fixes break ath9k-based AP #forregzbot Thorsten Leemhuis
2022-03-25 9:24 ` Thorsten Leemhuis
2022-03-27 9:00 ` Thorsten Leemhuis
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