From: Martyn Welch <martyn.welch@ge.com>
To: Dmitry Kalinkin <dmitry.kalinkin@gmail.com>,
Alessio Igor Bogani <alessioigorbogani@gmail.com>
Cc: <devel@driverdev.osuosl.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Igor Alekseev <igor.alekseev@itep.ru>,
LKML <linux-kernel@vger.kernel.org>,
Manohar Vanga <manohar.vanga@gmail.com>
Subject: Re: [PATCHv3 08/16] staging: vme_user: provide DMA functionality
Date: Wed, 8 Jul 2015 14:57:37 +0100 [thread overview]
Message-ID: <559D2C51.9080108@ge.com> (raw)
In-Reply-To: <B926DF49-CB45-4DAA-AC77-FE8FD679D821@gmail.com>
On 07/07/15 11:52, Dmitry Kalinkin wrote:
> The API I had in mind would have only vme_master_read and
> vme_master_write that would take absolute addresses (not relative to
> any window). These variants of access functions would then try to
> reuse any window that is already able to serve the request or wait
> for a free window and reconfigure it for the need of the request.
I'm a little concerned by the latency this might cause, especially if
there is one device which is negatively affected by latency. Handling
RORA interrupts would be "interesting" if all the windows were
dynamically allocated at the time at which an interrupt came in.
Martyn
--
Martyn Welch (Lead Software Engineer) | Registered in England and Wales
GE Intelligent Platforms | (3828642) at 100 Barbirolli Square
T +44(0)1327322748 | Manchester, M2 3AB
E martyn.welch@ge.com | VAT:GB 927559189
next prev parent reply other threads:[~2015-07-08 13:57 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-28 12:06 [PATCHv3 00/16] vme DMA and user space driver improvements Dmitry Kalinkin
2015-05-28 12:06 ` [PATCHv3 01/16] Documentation: mention vme_master_mmap() in VME API Dmitry Kalinkin
2015-05-28 12:06 ` [PATCHv3 02/16] vme: tsi148: fix DMA lists longer that one item Dmitry Kalinkin
2015-05-28 12:07 ` [PATCHv3 03/16] vme: tsi148: fix first DMA item mapping Dmitry Kalinkin
2015-05-28 12:07 ` [PATCHv3 04/16] vme: stop DMA transfer on interruption Dmitry Kalinkin
2015-05-28 12:07 ` [PATCHv3 05/16] staging: vme_user: refactor llseek to switch(){} Dmitry Kalinkin
2015-05-28 12:07 ` [PATCHv3 06/16] vme: check for A64 overflow in vme_check_window() Dmitry Kalinkin
2015-05-28 12:07 ` [PATCHv3 07/16] vme: export vme_check_window() Dmitry Kalinkin
2015-05-28 12:07 ` [PATCHv3 08/16] staging: vme_user: provide DMA functionality Dmitry Kalinkin
2015-06-13 0:28 ` Greg Kroah-Hartman
2015-07-06 13:22 ` Martyn Welch
2015-07-06 13:50 ` Dmitry Kalinkin
2015-07-06 14:48 ` Martyn Welch
2015-07-06 17:24 ` Dmitry Kalinkin
2015-07-07 7:13 ` Alessio Igor Bogani
[not found] ` <CAPk1OjEX7YX5J=yMPOGyGg7ZT6P-iKtaGRDDv2oARPFUcdnKnQ@mail.gmail.com>
2015-07-07 10:52 ` Dmitry Kalinkin
2015-07-08 13:57 ` Martyn Welch [this message]
2015-07-08 14:47 ` Dmitry Kalinkin
[not found] ` <78FC1849-FFE4-49E5-8421-25D27324F790@gmail.com>
2015-07-07 12:51 ` Alessio Igor Bogani
2015-07-07 13:04 ` Dmitry Kalinkin
2015-07-08 13:41 ` Martyn Welch
2015-07-08 14:39 ` Dmitry Kalinkin
2015-07-08 14:42 ` [PATCH] vme: lower alignment requirement in pci bridge drivers Dmitry Kalinkin
2015-07-08 13:28 ` [PATCHv3 08/16] staging: vme_user: provide DMA functionality Martyn Welch
2015-07-08 13:22 ` Martyn Welch
2015-07-08 15:02 ` Generic VME UIO driver Dmitry Kalinkin
2015-07-20 8:09 ` Martyn Welch
2015-05-28 12:07 ` [PATCHv3 09/16] vme: ca91cx42: return error code on DMA error Dmitry Kalinkin
2015-05-28 12:07 ` [PATCHv3 10/16] vme: ca91cx42: fix LM_CTL address mask Dmitry Kalinkin
2015-05-28 12:07 ` [PATCHv3 11/16] staging: vme_user: remove unused counters Dmitry Kalinkin
2015-05-28 12:07 ` [PATCHv3 12/16] staging: vme_user: remove forward declarations Dmitry Kalinkin
2015-05-28 12:07 ` [PATCHv3 13/16] staging: vme_user: remove open/release Dmitry Kalinkin
2015-05-28 12:07 ` [PATCHv3 14/16] staging: vme_user: remove buf_unalloc helper Dmitry Kalinkin
2015-05-28 12:07 ` [PATCHv3 15/16] vme: tsi148: depend on HAS_DMA for Kconfig Dmitry Kalinkin
2015-05-28 12:07 ` [PATCHv3 16/16] vme: provide uapi header Dmitry Kalinkin
2015-06-13 0:30 ` Greg Kroah-Hartman
2015-05-31 3:06 ` [PATCHv3 00/16] vme DMA and user space driver improvements Greg Kroah-Hartman
2015-06-10 13:09 ` Dmitry Kalinkin
2015-06-13 0:31 ` Greg Kroah-Hartman
2015-06-13 2:04 ` Dmitry Kalinkin
2015-06-13 2:24 ` Greg Kroah-Hartman
2015-06-13 2:30 ` Dmitry Kalinkin
2015-06-13 4:40 ` Greg Kroah-Hartman
2015-06-13 13:34 ` [PATCHv4 0/4] " Dmitry Kalinkin
2015-06-13 13:34 ` [PATCHv4 1/4] staging: vme_user: remove forward declarations Dmitry Kalinkin
2015-06-13 13:34 ` [PATCHv4 2/4] staging: vme_user: remove open/release Dmitry Kalinkin
2015-06-13 13:34 ` [PATCHv4 3/4] staging: vme_user: remove buf_unalloc helper Dmitry Kalinkin
2015-06-13 13:34 ` [PATCHv4 4/4] staging: vme_user: provide DMA functionality Dmitry Kalinkin
2015-06-13 21:47 ` [PATCHv4 0/4] vme DMA and user space driver improvements Greg Kroah-Hartman
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=559D2C51.9080108@ge.com \
--to=martyn.welch@ge.com \
--cc=alessioigorbogani@gmail.com \
--cc=devel@driverdev.osuosl.org \
--cc=dmitry.kalinkin@gmail.com \
--cc=gregkh@linuxfoundation.org \
--cc=igor.alekseev@itep.ru \
--cc=linux-kernel@vger.kernel.org \
--cc=manohar.vanga@gmail.com \
/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: link
Be 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.