From: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> To: linux-snps-arc@lists.infradead.org Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, Vineet Gupta <Vineet.Gupta1@synopsys.com>, Alexey Brodkin <Alexey.Brodkin@synopsys.com>, hch@lst.de, Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Subject: [PATCH v2 0/4] ARC: allow to use IOC and non-IOC DMA devices simultaneously Date: Mon, 30 Jul 2018 19:26:32 +0300 [thread overview] Message-ID: <20180730162636.3556-1-Eugeniy.Paltsev@synopsys.com> (raw) The ARC HS processor provides an IOC port (I/O coherency bus interface) that allows external devices such as DMA devices to access memory through the cache hierarchy, providing coherency between I/O transactions and the complete memory hierarchy. Some recent SoC with ARC HS (like HSDK) allow to select bus port (IOC or non-IOC port) for connecting DMA devices in runtime. With this patch we can use both HW-coherent and regular DMA peripherals simultaneously. NOTE: This patch series was stress tested on HSDK with iperf3 (ethernet) and bonie++ (usb and sdio) in three configurations: * IOC enabled globaly * IOC disabled globaly * IOC enabled partially (USB & SDIO are connected via IOC AXI port, ethernet is connected to DDR AXI port (non-IOC port) NOTE: If you want to test some device without IOC it is not enough to remove "dma-coherent" property from dts. You had to remap this device to regular DDR AXI port intead of IOC AXI port. You also need to apply 3 following patches firstly: https://www.mail-archive.com/linux-snps-arc@lists.infradead.org/msg03865.html https://www.mail-archive.com/linux-snps-arc@lists.infradead.org/msg03889.html https://www.mail-archive.com/linux-snps-arc@lists.infradead.org/msg03887.html NOTE: We don't touch any aperture configuration in this patch series. So we don't switch any devices between IOC and non-IOC AXI ports on any board. It can be done later if it is required. Changes v1->v2 (Thanks to Christoph): * Don't select DMA_DIRECT_OPS explicitly as it is already selected by DMA_NONCOHERENT_OPS * Remove check for HIGHMEM pages from arch_dma_{alloc, free} Eugeniy Paltsev (4): ARC: DTS: mark DMA devices connected through IOC port as dma-coherent ARC: allow to use IOC and non-IOC DMA devices simultaneously ARC: IOC: panic if both IOC and ZONE_HIGHMEM enabled ARC: don't check for HIGHMEM pages in arch_dma_alloc arch/arc/boot/dts/axc003.dtsi | 26 ++++++++++++++++ arch/arc/boot/dts/axc003_idu.dtsi | 26 ++++++++++++++++ arch/arc/boot/dts/hsdk.dts | 4 +++ arch/arc/include/asm/dma-mapping.h | 13 ++++++++ arch/arc/mm/cache.c | 30 +++++++++--------- arch/arc/mm/dma.c | 62 +++++++++++++++++++------------------- 6 files changed, 115 insertions(+), 46 deletions(-) create mode 100644 arch/arc/include/asm/dma-mapping.h -- 2.14.4
WARNING: multiple messages have this Message-ID (diff)
From: Eugeniy.Paltsev@synopsys.com (Eugeniy Paltsev) To: linux-snps-arc@lists.infradead.org Subject: [PATCH v2 0/4] ARC: allow to use IOC and non-IOC DMA devices simultaneously Date: Mon, 30 Jul 2018 19:26:32 +0300 [thread overview] Message-ID: <20180730162636.3556-1-Eugeniy.Paltsev@synopsys.com> (raw) The ARC HS processor provides an IOC port (I/O coherency bus interface) that allows external devices such as DMA devices to access memory through the cache hierarchy, providing coherency between I/O transactions and the complete memory hierarchy. Some recent SoC with ARC HS (like HSDK) allow to select bus port (IOC or non-IOC port) for connecting DMA devices in runtime. With this patch we can use both HW-coherent and regular DMA peripherals simultaneously. NOTE: This patch series was stress tested on HSDK with iperf3 (ethernet) and bonie++ (usb and sdio) in three configurations: * IOC enabled globaly * IOC disabled globaly * IOC enabled partially (USB & SDIO are connected via IOC AXI port, ethernet is connected to DDR AXI port (non-IOC port) NOTE: If you want to test some device without IOC it is not enough to remove "dma-coherent" property from dts. You had to remap this device to regular DDR AXI port intead of IOC AXI port. You also need to apply 3 following patches firstly: https://www.mail-archive.com/linux-snps-arc at lists.infradead.org/msg03865.html https://www.mail-archive.com/linux-snps-arc at lists.infradead.org/msg03889.html https://www.mail-archive.com/linux-snps-arc at lists.infradead.org/msg03887.html NOTE: We don't touch any aperture configuration in this patch series. So we don't switch any devices between IOC and non-IOC AXI ports on any board. It can be done later if it is required. Changes v1->v2 (Thanks to Christoph): * Don't select DMA_DIRECT_OPS explicitly as it is already selected by DMA_NONCOHERENT_OPS * Remove check for HIGHMEM pages from arch_dma_{alloc, free} Eugeniy Paltsev (4): ARC: DTS: mark DMA devices connected through IOC port as dma-coherent ARC: allow to use IOC and non-IOC DMA devices simultaneously ARC: IOC: panic if both IOC and ZONE_HIGHMEM enabled ARC: don't check for HIGHMEM pages in arch_dma_alloc arch/arc/boot/dts/axc003.dtsi | 26 ++++++++++++++++ arch/arc/boot/dts/axc003_idu.dtsi | 26 ++++++++++++++++ arch/arc/boot/dts/hsdk.dts | 4 +++ arch/arc/include/asm/dma-mapping.h | 13 ++++++++ arch/arc/mm/cache.c | 30 +++++++++--------- arch/arc/mm/dma.c | 62 +++++++++++++++++++------------------- 6 files changed, 115 insertions(+), 46 deletions(-) create mode 100644 arch/arc/include/asm/dma-mapping.h -- 2.14.4
next reply other threads:[~2018-07-30 16:26 UTC|newest] Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-07-30 16:26 Eugeniy Paltsev [this message] 2018-07-30 16:26 ` [PATCH v2 0/4] ARC: allow to use IOC and non-IOC DMA devices simultaneously Eugeniy Paltsev 2018-07-30 16:26 ` [PATCH v2 1/4] ARC: DTS: mark DMA devices connected through IOC port as dma-coherent Eugeniy Paltsev 2018-07-30 16:26 ` Eugeniy Paltsev 2018-07-30 16:26 ` [PATCH v2 2/4] ARC: allow to use IOC and non-IOC DMA devices simultaneously Eugeniy Paltsev 2018-07-30 16:26 ` Eugeniy Paltsev 2018-08-13 16:24 ` Vineet Gupta 2018-08-13 16:24 ` Vineet Gupta 2018-08-13 16:24 ` Vineet Gupta 2018-08-13 17:08 ` Eugeniy Paltsev 2018-08-13 17:08 ` Eugeniy Paltsev 2018-08-13 17:08 ` Eugeniy Paltsev 2018-08-20 22:34 ` Vineet Gupta 2018-08-20 22:34 ` Vineet Gupta 2018-08-20 22:34 ` Vineet Gupta 2018-08-22 18:40 ` Eugeniy Paltsev 2018-08-22 18:40 ` Eugeniy Paltsev 2018-08-22 18:40 ` Eugeniy Paltsev 2018-08-23 14:05 ` hch 2018-08-23 14:05 ` hch 2018-08-23 14:05 ` hch 2018-09-04 18:13 ` Vineet Gupta 2018-09-04 18:13 ` Vineet Gupta 2018-09-04 18:13 ` Vineet Gupta 2018-07-30 16:26 ` [PATCH v2 3/4] ARC: IOC: panic if both IOC and ZONE_HIGHMEM enabled Eugeniy Paltsev 2018-07-30 16:26 ` Eugeniy Paltsev 2018-07-30 16:26 ` [PATCH v2 4/4] ARC: don't check for HIGHMEM pages in arch_dma_alloc Eugeniy Paltsev 2018-07-30 16:26 ` Eugeniy Paltsev 2018-07-31 8:08 ` Christoph Hellwig 2018-07-31 8:08 ` Christoph Hellwig 2018-08-13 16:19 ` [PATCH v2 0/4] ARC: allow to use IOC and non-IOC DMA devices simultaneously Vineet Gupta 2018-08-13 16:19 ` Vineet Gupta 2018-08-13 16:19 ` Vineet Gupta 2018-08-13 17:27 ` Eugeniy Paltsev 2018-08-13 17:27 ` Eugeniy Paltsev 2018-08-13 17:27 ` Eugeniy Paltsev 2018-08-13 17:39 ` Vineet Gupta 2018-08-13 17:39 ` Vineet Gupta 2018-08-13 17:39 ` Vineet Gupta 2018-09-04 20:14 ` Vineet Gupta 2018-09-04 20:14 ` Vineet Gupta 2018-09-04 20:14 ` Vineet Gupta 2018-09-04 21:11 ` Christoph Hellwig 2018-09-04 21:11 ` Christoph Hellwig 2018-09-04 21:34 ` Vineet Gupta 2018-09-04 21:34 ` Vineet Gupta 2018-09-04 21:34 ` Vineet Gupta 2018-09-04 21:38 ` Christoph Hellwig 2018-09-04 21:38 ` Christoph Hellwig 2018-09-04 21:38 ` Christoph Hellwig
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=20180730162636.3556-1-Eugeniy.Paltsev@synopsys.com \ --to=eugeniy.paltsev@synopsys.com \ --cc=Alexey.Brodkin@synopsys.com \ --cc=Vineet.Gupta1@synopsys.com \ --cc=hch@lst.de \ --cc=linux-arch@vger.kernel.org \ --cc=linux-kernel@vger.kernel.org \ --cc=linux-snps-arc@lists.infradead.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.