From: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> To: Thierry Reding <thierry.reding@avionic-design.de> Cc: Arnd Bergmann <arnd@arndb.de>, Stephen Warren <swarren@wwwdotorg.org>, linux-tegra@vger.kernel.org, Grant Likely <grant.likely@secretlab.ca>, Rob Herring <rob.herring@calxeda.com>, Russell King <linux@arm.linux.org.uk>, Bjorn Helgaas <bhelgaas@google.com>, Andrew Murray <andrew.murray@arm.com>, Thomas Petazzoni <thomas.petazzoni@free-electrons.com>, devicetree-discuss@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org Subject: Re: [PATCH 05/14] lib: Add I/O map cache implementation Date: Thu, 10 Jan 2013 12:24:17 -0700 [thread overview] Message-ID: <20130110192417.GA18478@obsidianresearch.com> (raw) In-Reply-To: <20130110190327.GA23110@avionic-0098.adnet.avionic-design.de> On Thu, Jan 10, 2013 at 08:03:27PM +0100, Thierry Reding wrote: > > > You'd piece a mapping together, each bus requires 16 64k mappings, a > > > simple 2d array of busnr*16 of pointers would do the trick. A more > > > clever solution would be to allocate contiguous virtual memory and > > > split that up.. > > Oh, I see. I'm not very familiar with the internals of remapping, so > > I'll need to do some more reading. Thanks for the hints. > > I forgot to ask. What's the advantage of having a contiguous virtual > memory area and splitting it up versus remapping each chunk separately? Not alot, really, but it saves you from the pointer array and associated overhead. IIRC it is fairly easy to do in the kernel. Arnd's version is good too, but you would be restricted to aligned powers of two for the bus number range in the DT, which is probably not that big a deal either? Jason
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From: jgunthorpe@obsidianresearch.com (Jason Gunthorpe) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 05/14] lib: Add I/O map cache implementation Date: Thu, 10 Jan 2013 12:24:17 -0700 [thread overview] Message-ID: <20130110192417.GA18478@obsidianresearch.com> (raw) In-Reply-To: <20130110190327.GA23110@avionic-0098.adnet.avionic-design.de> On Thu, Jan 10, 2013 at 08:03:27PM +0100, Thierry Reding wrote: > > > You'd piece a mapping together, each bus requires 16 64k mappings, a > > > simple 2d array of busnr*16 of pointers would do the trick. A more > > > clever solution would be to allocate contiguous virtual memory and > > > split that up.. > > Oh, I see. I'm not very familiar with the internals of remapping, so > > I'll need to do some more reading. Thanks for the hints. > > I forgot to ask. What's the advantage of having a contiguous virtual > memory area and splitting it up versus remapping each chunk separately? Not alot, really, but it saves you from the pointer array and associated overhead. IIRC it is fairly easy to do in the kernel. Arnd's version is good too, but you would be restricted to aligned powers of two for the bus number range in the DT, which is probably not that big a deal either? Jason
next prev parent reply other threads:[~2013-01-10 19:24 UTC|newest] Thread overview: 267+ messages / expand[flat|nested] mbox.gz Atom feed top 2013-01-09 20:43 [PATCH 00/14] Rewrite Tegra PCIe driver Thierry Reding 2013-01-09 20:43 ` Thierry Reding 2013-01-09 20:43 ` [PATCH 02/14] of/pci: Add of_pci_get_devfn() function Thierry Reding 2013-01-09 20:43 ` Thierry Reding [not found] ` <1357764194-12677-3-git-send-email-thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org> 2013-01-11 0:09 ` Stephen Warren 2013-01-11 0:09 ` Stephen Warren 2013-01-11 0:09 ` Stephen Warren 2013-01-11 4:06 ` Thierry Reding 2013-01-11 4:06 ` Thierry Reding 2013-01-09 20:43 ` [PATCH 05/14] lib: Add I/O map cache implementation Thierry Reding 2013-01-09 20:43 ` Thierry Reding 2013-01-09 20:43 ` Thierry Reding [not found] ` <1357764194-12677-6-git-send-email-thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org> 2013-01-09 21:19 ` Arnd Bergmann 2013-01-09 21:19 ` Arnd Bergmann 2013-01-09 21:19 ` Arnd Bergmann 2013-01-09 21:54 ` Thierry Reding 2013-01-09 21:54 ` Thierry Reding [not found] ` <20130109215428.GA13648-RM9K5IK7kjIyiCvfTdI0JKcOhU4Rzj621B7CTYaBSLdn68oJJulU0Q@public.gmane.org> 2013-01-09 22:10 ` Arnd Bergmann 2013-01-09 22:10 ` Arnd Bergmann 2013-01-09 22:10 ` Arnd Bergmann [not found] ` <201301092210.49452.arnd-r2nGTMty4D4@public.gmane.org> 2013-01-09 23:12 ` Stephen Warren 2013-01-09 23:12 ` Stephen Warren 2013-01-09 23:12 ` Stephen Warren 2013-01-09 23:17 ` Jason Gunthorpe 2013-01-09 23:17 ` Jason Gunthorpe [not found] ` <20130109231758.GA27065-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org> 2013-01-10 7:19 ` Thierry Reding 2013-01-10 7:19 ` Thierry Reding 2013-01-10 7:19 ` Thierry Reding [not found] ` <20130110071937.GG15212-RM9K5IK7kjIyiCvfTdI0JKcOhU4Rzj621B7CTYaBSLdn68oJJulU0Q@public.gmane.org> 2013-01-10 9:17 ` Arnd Bergmann 2013-01-10 9:17 ` Arnd Bergmann 2013-01-10 9:17 ` Arnd Bergmann [not found] ` <201301100917.19577.arnd-r2nGTMty4D4@public.gmane.org> 2013-01-10 10:25 ` Thierry Reding 2013-01-10 10:25 ` Thierry Reding 2013-01-10 10:25 ` Thierry Reding [not found] ` <20130110102544.GA5546-RM9K5IK7kjIyiCvfTdI0JKcOhU4Rzj621B7CTYaBSLdn68oJJulU0Q@public.gmane.org> 2013-01-10 18:20 ` Jason Gunthorpe 2013-01-10 18:20 ` Jason Gunthorpe 2013-01-10 18:20 ` Jason Gunthorpe [not found] ` <20130110182007.GA28004-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org> 2013-01-10 18:55 ` Thierry Reding 2013-01-10 18:55 ` Thierry Reding 2013-01-10 18:55 ` Thierry Reding 2013-01-10 19:03 ` Thierry Reding 2013-01-10 19:03 ` Thierry Reding 2013-01-10 19:24 ` Jason Gunthorpe [this message] 2013-01-10 19:24 ` Jason Gunthorpe [not found] ` <20130110192417.GA18478-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org> 2013-01-10 20:20 ` Thierry Reding 2013-01-10 20:20 ` Thierry Reding 2013-01-10 20:20 ` Thierry Reding [not found] ` <20130110202007.GA26139-RM9K5IK7kjIyiCvfTdI0JKcOhU4Rzj621B7CTYaBSLdn68oJJulU0Q@public.gmane.org> 2013-01-10 21:06 ` Jason Gunthorpe 2013-01-10 21:06 ` Jason Gunthorpe 2013-01-10 21:06 ` Jason Gunthorpe 2013-01-16 10:18 ` Thierry Reding 2013-01-16 10:18 ` Thierry Reding 2013-01-16 10:18 ` Thierry Reding [not found] ` <20130116101822.GA17706-RM9K5IK7kjIyiCvfTdI0JKcOhU4Rzj621B7CTYaBSLdn68oJJulU0Q@public.gmane.org> 2013-01-16 11:25 ` Russell King - ARM Linux 2013-01-16 11:25 ` Russell King - ARM Linux 2013-01-16 11:25 ` Russell King - ARM Linux [not found] ` <20130116112556.GR23505-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org> 2013-01-16 11:52 ` Thierry Reding 2013-01-16 11:52 ` Thierry Reding 2013-01-16 11:52 ` Thierry Reding 2013-01-10 18:26 ` Arnd Bergmann 2013-01-10 18:26 ` Arnd Bergmann 2013-01-10 18:26 ` Arnd Bergmann [not found] ` <201301101826.56248.arnd-r2nGTMty4D4@public.gmane.org> 2013-01-10 18:57 ` Thierry Reding 2013-01-10 18:57 ` Thierry Reding 2013-01-10 18:57 ` Thierry Reding 2013-01-10 7:10 ` Thierry Reding 2013-01-10 7:10 ` Thierry Reding 2013-01-10 7:10 ` Thierry Reding 2013-01-09 21:28 ` Russell King - ARM Linux 2013-01-09 21:28 ` Russell King - ARM Linux 2013-01-09 21:28 ` Russell King - ARM Linux [not found] ` <20130109212847.GT3931-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org> 2013-01-09 21:57 ` Thierry Reding 2013-01-09 21:57 ` Thierry Reding 2013-01-09 21:57 ` Thierry Reding [not found] ` <1357764194-12677-1-git-send-email-thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org> 2013-01-09 20:43 ` [PATCH 01/14] of/pci: Provide support for parsing PCI DT ranges property Thierry Reding 2013-01-09 20:43 ` Thierry Reding 2013-01-09 20:43 ` Thierry Reding 2013-01-11 0:06 ` Stephen Warren 2013-01-11 0:06 ` Stephen Warren [not found] ` <50EF5798.6040405-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org> 2013-01-11 4:02 ` Thierry Reding 2013-01-11 4:02 ` Thierry Reding 2013-01-11 4:02 ` Thierry Reding 2013-01-09 20:43 ` [PATCH 03/14] of/pci: Add of_pci_get_bus() function Thierry Reding 2013-01-09 20:43 ` Thierry Reding 2013-01-09 20:43 ` Thierry Reding 2013-01-09 20:43 ` [PATCH 04/14] of/pci: Add of_pci_parse_bus_range() function Thierry Reding 2013-01-09 20:43 ` Thierry Reding 2013-01-09 20:43 ` Thierry Reding 2013-01-09 20:43 ` [PATCH 06/14] ARM: pci: Keep pci_common_init() around after init Thierry Reding 2013-01-09 20:43 ` Thierry Reding 2013-01-09 20:43 ` Thierry Reding [not found] ` <1357764194-12677-7-git-send-email-thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org> 2013-02-05 20:41 ` Thierry Reding 2013-02-05 20:41 ` Thierry Reding 2013-02-05 20:41 ` Thierry Reding [not found] ` <20130205204147.GA29726-RM9K5IK7kjIQXX3q8xo1gnVAuStQJXxyR5q1nwbD4aMs9pC9oP6+/A@public.gmane.org> 2013-02-06 16:30 ` Russell King - ARM Linux 2013-02-06 16:30 ` Russell King - ARM Linux 2013-02-06 16:30 ` Russell King - ARM Linux [not found] ` <20130206163041.GG17833-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org> 2013-02-06 19:35 ` Thierry Reding 2013-02-06 19:35 ` Thierry Reding 2013-02-06 19:35 ` Thierry Reding 2013-02-06 8:36 ` Thomas Petazzoni 2013-02-06 8:36 ` Thomas Petazzoni 2013-02-06 8:36 ` Thomas Petazzoni 2013-02-06 16:38 ` Linus Walleij 2013-02-06 16:38 ` Linus Walleij 2013-02-06 16:38 ` Linus Walleij 2013-02-07 0:54 ` Arnd Bergmann 2013-02-07 0:54 ` Arnd Bergmann 2013-02-06 17:07 ` Linus Walleij 2013-02-06 17:07 ` Linus Walleij 2013-02-06 17:07 ` Linus Walleij 2013-02-07 1:20 ` Arnd Bergmann 2013-02-07 1:20 ` Arnd Bergmann 2013-02-07 1:20 ` Arnd Bergmann 2013-01-09 20:43 ` [PATCH 07/14] ARM: pci: Allow passing per-controller private data Thierry Reding 2013-01-09 20:43 ` Thierry Reding 2013-01-09 20:43 ` Thierry Reding 2013-01-09 20:43 ` [PATCH 08/14] ARM: tegra: Move tegra_pcie_xclk_clamp() to PMC Thierry Reding 2013-01-09 20:43 ` Thierry Reding 2013-01-09 20:43 ` Thierry Reding 2013-01-09 20:43 ` [PATCH 11/14] ARM: tegra: tamonten: Add PCIe support Thierry Reding 2013-01-09 20:43 ` Thierry Reding 2013-01-09 20:43 ` Thierry Reding [not found] ` <1357764194-12677-12-git-send-email-thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org> 2013-01-09 21:23 ` Arnd Bergmann 2013-01-09 21:23 ` Arnd Bergmann 2013-01-09 21:23 ` Arnd Bergmann [not found] ` <201301092123.37491.arnd-r2nGTMty4D4@public.gmane.org> 2013-01-10 20:21 ` Thierry Reding 2013-01-10 20:21 ` Thierry Reding 2013-01-10 20:21 ` Thierry Reding 2013-01-09 20:43 ` [PATCH 14/14] ARM: tegra: trimslice: Initialize PCIe from DT Thierry Reding 2013-01-09 20:43 ` Thierry Reding 2013-01-09 20:43 ` Thierry Reding [not found] ` <1357764194-12677-15-git-send-email-thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org> 2013-01-10 23:56 ` Stephen Warren 2013-01-10 23:56 ` Stephen Warren 2013-01-10 23:56 ` Stephen Warren [not found] ` <50EF5537.6080602-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org> 2013-01-11 18:48 ` Thierry Reding 2013-01-11 18:48 ` Thierry Reding 2013-01-11 18:48 ` Thierry Reding 2013-01-09 21:25 ` [PATCH 00/14] Rewrite Tegra PCIe driver Thomas Petazzoni 2013-01-09 21:25 ` Thomas Petazzoni 2013-01-09 21:25 ` Thomas Petazzoni 2013-01-10 6:55 ` Thierry Reding 2013-01-10 6:55 ` Thierry Reding 2013-01-10 6:55 ` Thierry Reding 2013-01-10 8:34 ` Thomas Petazzoni 2013-01-10 8:34 ` Thomas Petazzoni 2013-03-06 18:16 ` Murali Karicheri 2013-01-09 20:43 ` [PATCH 09/14] ARM: tegra: Move pmc.h to include/mach Thierry Reding 2013-01-09 20:43 ` Thierry Reding [not found] ` <1357764194-12677-10-git-send-email-thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org> 2013-01-11 0:15 ` Stephen Warren 2013-01-11 0:15 ` Stephen Warren 2013-01-11 0:15 ` Stephen Warren [not found] ` <50EF598B.2030307-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org> 2013-01-11 4:08 ` Thierry Reding 2013-01-11 4:08 ` Thierry Reding 2013-01-11 4:08 ` Thierry Reding 2013-01-09 20:43 ` [PATCH 10/14] PCI: tegra: Move PCIe driver to drivers/pci/host Thierry Reding 2013-01-09 20:43 ` Thierry Reding [not found] ` <1357764194-12677-11-git-send-email-thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org> 2013-01-09 21:22 ` Arnd Bergmann 2013-01-09 21:22 ` Arnd Bergmann 2013-01-09 21:22 ` Arnd Bergmann [not found] ` <201301092122.08011.arnd-r2nGTMty4D4@public.gmane.org> 2013-01-09 21:58 ` Thierry Reding 2013-01-09 21:58 ` Thierry Reding 2013-01-09 21:58 ` Thierry Reding 2013-01-09 22:03 ` Arnd Bergmann 2013-01-09 22:03 ` Arnd Bergmann 2013-01-11 0:48 ` Stephen Warren 2013-01-11 0:48 ` Stephen Warren 2013-01-11 0:48 ` Stephen Warren [not found] ` <50EF616E.7040609-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org> 2013-01-11 3:52 ` Thierry Reding 2013-01-11 3:52 ` Thierry Reding 2013-01-11 3:52 ` Thierry Reding 2013-01-11 20:34 ` Stephen Warren 2013-01-11 20:34 ` Stephen Warren 2013-02-13 23:11 ` Thomas Petazzoni 2013-02-13 23:11 ` Thomas Petazzoni 2013-02-13 23:11 ` Thomas Petazzoni 2013-01-10 23:54 ` Stephen Warren 2013-01-10 23:54 ` Stephen Warren 2013-01-11 3:40 ` Thierry Reding 2013-01-11 3:40 ` Thierry Reding [not found] ` <20130111034015.GA28094-RM9K5IK7kjIyiCvfTdI0JKcOhU4Rzj621B7CTYaBSLdn68oJJulU0Q@public.gmane.org> 2013-01-11 15:36 ` Arnd Bergmann 2013-01-11 15:36 ` Arnd Bergmann 2013-01-11 15:36 ` Arnd Bergmann [not found] ` <201301111536.14799.arnd-r2nGTMty4D4@public.gmane.org> 2013-01-11 15:45 ` Thierry Reding 2013-01-11 15:45 ` Thierry Reding 2013-01-11 15:45 ` Thierry Reding [not found] ` <20130111154516.GA25335-RM9K5IK7kjIyiCvfTdI0JKcOhU4Rzj621B7CTYaBSLdn68oJJulU0Q@public.gmane.org> 2013-01-12 12:36 ` Thierry Reding 2013-01-12 12:36 ` Thierry Reding 2013-01-12 12:36 ` Thierry Reding 2013-01-12 21:12 ` Arnd Bergmann 2013-01-12 21:12 ` Arnd Bergmann 2013-01-13 9:58 ` Thierry Reding 2013-01-13 9:58 ` Thierry Reding [not found] ` <20130113095806.GA31966-RM9K5IK7kjIyiCvfTdI0JKcOhU4Rzj621B7CTYaBSLdn68oJJulU0Q@public.gmane.org> 2013-01-14 9:57 ` Andrew Murray 2013-01-14 9:57 ` Andrew Murray 2013-01-14 9:57 ` Andrew Murray 2013-01-14 9:57 ` Andrew Murray [not found] ` <20130114095706.GA23467-5wv7dgnIgG8@public.gmane.org> 2013-01-15 12:08 ` Thierry Reding 2013-01-15 12:08 ` Thierry Reding 2013-01-15 12:08 ` Thierry Reding 2013-01-15 12:08 ` Thierry Reding 2013-01-15 12:44 ` Arnd Bergmann 2013-01-15 12:44 ` Arnd Bergmann 2013-01-15 12:44 ` Arnd Bergmann [not found] ` <201301151244.12767.arnd-r2nGTMty4D4@public.gmane.org> 2013-01-15 15:40 ` Andrew Murray 2013-01-15 15:40 ` Andrew Murray 2013-01-15 15:40 ` Andrew Murray 2013-01-15 15:40 ` Andrew Murray [not found] ` <20130115154038.GA11241-5wv7dgnIgG8@public.gmane.org> 2013-01-15 21:14 ` Thierry Reding 2013-01-15 21:14 ` Thierry Reding 2013-01-15 21:14 ` Thierry Reding 2013-01-15 21:14 ` Thierry Reding 2013-01-16 14:00 ` Arnd Bergmann 2013-01-16 14:00 ` Arnd Bergmann 2013-01-16 14:00 ` Arnd Bergmann 2013-01-16 16:17 ` Andrew Murray 2013-01-16 16:17 ` Andrew Murray 2013-01-16 16:17 ` Andrew Murray 2013-01-16 18:31 ` Thierry Reding 2013-01-16 18:31 ` Thierry Reding 2013-01-16 18:31 ` Thierry Reding 2013-01-17 15:42 ` Andrew Murray 2013-01-17 15:42 ` Andrew Murray 2013-01-17 15:42 ` Andrew Murray [not found] ` <20130117154236.GA25943-5wv7dgnIgG8@public.gmane.org> 2013-01-17 16:05 ` Thierry Reding 2013-01-17 16:05 ` Thierry Reding 2013-01-17 16:05 ` Thierry Reding 2013-01-17 16:05 ` Thierry Reding 2013-01-17 16:22 ` Andrew Murray 2013-01-17 16:22 ` Andrew Murray 2013-01-17 16:22 ` Andrew Murray [not found] ` <20130117162218.GA29016-5wv7dgnIgG8@public.gmane.org> 2013-01-17 20:30 ` Thierry Reding 2013-01-17 20:30 ` Thierry Reding 2013-01-17 20:30 ` Thierry Reding 2013-01-17 20:30 ` Thierry Reding 2013-01-18 9:18 ` Andrew Murray 2013-01-18 9:18 ` Andrew Murray 2013-01-18 9:18 ` Andrew Murray 2013-01-22 19:29 ` Jason Gunthorpe 2013-01-22 19:29 ` Jason Gunthorpe 2013-01-22 19:29 ` Jason Gunthorpe 2013-01-22 19:29 ` Jason Gunthorpe 2013-01-29 13:31 ` Andrew Murray 2013-01-29 13:31 ` Andrew Murray 2013-01-29 13:31 ` Andrew Murray 2013-01-18 9:56 ` Andrew Murray 2013-01-18 9:56 ` Andrew Murray 2013-01-18 9:56 ` Andrew Murray [not found] ` <20130118095620.GA7552-5wv7dgnIgG8@public.gmane.org> 2013-01-18 10:09 ` Thierry Reding 2013-01-18 10:09 ` Thierry Reding 2013-01-18 10:09 ` Thierry Reding 2013-01-18 10:09 ` Thierry Reding 2013-01-09 20:43 ` [PATCH 12/14] ARM: tegra: tec: Add PCIe support Thierry Reding 2013-01-09 20:43 ` Thierry Reding [not found] ` <1357764194-12677-13-git-send-email-thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org> 2013-01-11 0:22 ` Stephen Warren 2013-01-11 0:22 ` Stephen Warren 2013-01-11 0:22 ` Stephen Warren 2013-01-11 4:34 ` Thierry Reding 2013-01-11 4:34 ` Thierry Reding 2013-01-09 20:43 ` [PATCH 13/14] ARM: tegra: harmony: Initialize PCIe from DT Thierry Reding 2013-01-09 20:43 ` Thierry Reding 2013-01-09 20:43 ` Thierry Reding [not found] ` <1357764194-12677-14-git-send-email-thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org> 2013-01-10 23:58 ` Stephen Warren 2013-01-10 23:58 ` Stephen Warren 2013-01-10 23:58 ` Stephen Warren 2013-01-28 18:15 ` [PATCH 00/14] Rewrite Tegra PCIe driver Bjorn Helgaas 2013-01-28 18:15 ` Bjorn Helgaas
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