From patchwork Wed Jan 31 09:00:19 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Philipp Stanner X-Patchwork-Id: 1893310 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=EB50d9GL; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=2604:1380:4601:e00::3; helo=am.mirrors.kernel.org; envelope-from=linux-pci+bounces-2873-incoming=patchwork.ozlabs.org@vger.kernel.org; receiver=patchwork.ozlabs.org) Received: from am.mirrors.kernel.org (am.mirrors.kernel.org [IPv6:2604:1380:4601:e00::3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (secp384r1)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4TPx3m1WT9z23dQ for ; Wed, 31 Jan 2024 20:06:28 +1100 (AEDT) Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by am.mirrors.kernel.org (Postfix) with ESMTPS id EDC621F2966E for ; Wed, 31 Jan 2024 09:06:25 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 5630B74E39; Wed, 31 Jan 2024 09:00:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="EB50d9GL" X-Original-To: linux-pci@vger.kernel.org Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EE30274E0D for ; Wed, 31 Jan 2024 09:00:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706691652; cv=none; b=TCYAaJwrczJL3LulAUAHo4JKnhGNyD8WBiWQ1/j7l02BkAO/d/7sxrL+qmkM4zFsdFayheobwuGvBqQAc2A323b3Bkdlvu417haXwUe/bNDW+aez91eT/xhjBoN7u8hc7YosPgYLUvndCRfFwfhmogVKy83ZY6i58OtOGM0dzxE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706691652; c=relaxed/simple; bh=WbPXvYbo7DOiKDMradZ/IJwGvEXKxgPGiqlaS/fimcA=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=P9brMUmxYxPaUQtZDZl7gpllAQOM6pqCQZtUU3tsVLmDWsAm15fZJL3J0teeurwgflMchgtd76pwyqvawA+/7neCVIoR9RmeZnnkHN4l6klAdCGYQQiGcr99G75Mm/JMCekfMvnjiwt2Se5Zn8aVt//KsP5gqa3HOCrso/FHLhQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=EB50d9GL; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1706691648; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=YpiKUVItyUOZNWxnS77CJhTEKvHG8IwJ6DmqwnzX9Bg=; b=EB50d9GLs1jNDDjOB7+kH2vibwcfNfoDEYuuKq7dLD/Ia8fDMa3frPrHeXurHjomm+ZQhM dmJlmy/E4454M84/ZtKtVCpuBmAze/0gW6RSzlGPx6Qcg1LvHzWokZdrc1waQviFE+zk9t 3bxPGdyI9JX3+PTe45rRzejTaqBASEk= Received: from mail-wr1-f70.google.com (mail-wr1-f70.google.com [209.85.221.70]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-527-T3j288F9PF6Kuc-Ypbp7cw-1; Wed, 31 Jan 2024 04:00:46 -0500 X-MC-Unique: T3j288F9PF6Kuc-Ypbp7cw-1 Received: by mail-wr1-f70.google.com with SMTP id ffacd0b85a97d-33ae2dd7d4aso119422f8f.1 for ; Wed, 31 Jan 2024 01:00:45 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1706691645; x=1707296445; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=YpiKUVItyUOZNWxnS77CJhTEKvHG8IwJ6DmqwnzX9Bg=; b=C3oO1X2NFrQSQlkzszKAxs4pLyeGEeei/Z2EX0sLVUjv8QJ/mj6RZZP5NLySNScnOG tyLP+Pj1x/fw6ThFGlIg1JyzScIdAtOpSlTEURhkVuq18XSMBN7SZorOd4q2dIGUtiNu IdGliNH2Hrgt3+PToaBHWbqU/3mLW0SggY8TmX5FpAWFw7qECakgLp3hA2hUZBm2TPmM KSPZkriXRFKtUU99RiGc53AstGTZpAr6SYhmjX+hqE8vbrqoryMrGBL/bYEWIb8Wt34B w1hOXdkqLv2VrDkb7QHU8eFn8fyHG7GCke5i4SNY/Mpy30J1SvAXc2Xsx6OsHdxOWsTn cJEQ== X-Forwarded-Encrypted: i=0; AJvYcCVtV2uG6YoBgikB6UZGZP0AKoUYlJQYEGvJZ7pQUBXCTJnH0/W2jndZrOlS6kMA5z/OW4YbwLehVoMu5RPSuq8c3tgc2fxWffy8 X-Gm-Message-State: AOJu0YzJ2hWSqniQG5Ib8+aqGz8E/2RP7fP8PtGVJTpSY10u0TgSRqI3 sIIkdSKRlaXwRt+INkSgaJeK+FR5UgDpPIizDD1cUB+5Nrr0GhiE5lX4S1hc+PlDFgXQEdsAY2N 20HQdP1+JMFp1HELOoxfyKtPQql2FdoeH7hZmd/ADePJhqsoYLxOYH9OW6Q== X-Received: by 2002:a05:600c:6003:b0:40e:eab6:f33f with SMTP id az3-20020a05600c600300b0040eeab6f33fmr749110wmb.3.1706691644848; Wed, 31 Jan 2024 01:00:44 -0800 (PST) X-Google-Smtp-Source: AGHT+IGMnYKqFE00aeqRVpLyd4XJIWP3xUf0t9c+CMIPSvwL/karnsDc7bjq3jQzxlCPquPDLWZLnw== X-Received: by 2002:a05:600c:6003:b0:40e:eab6:f33f with SMTP id az3-20020a05600c600300b0040eeab6f33fmr749072wmb.3.1706691644431; Wed, 31 Jan 2024 01:00:44 -0800 (PST) Received: from pstanner-thinkpadt14sgen1.muc.redhat.com (nat-pool-muc-t.redhat.com. [149.14.88.26]) by smtp.gmail.com with ESMTPSA id t15-20020a05600c198f00b0040ee51f1025sm940261wmq.43.2024.01.31.01.00.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 31 Jan 2024 01:00:44 -0800 (PST) From: Philipp Stanner To: Bjorn Helgaas , Arnd Bergmann , Johannes Berg , Randy Dunlap , NeilBrown , John Sanpe , Kent Overstreet , Niklas Schnelle , Philipp Stanner , Dave Jiang , Uladzislau Koshchanka , "Masami Hiramatsu (Google)" , David Gow , Kees Cook , Rae Moar , Geert Uytterhoeven , "wuqiang.matt" , Yury Norov , Jason Baron , Thomas Gleixner , Marco Elver , Andrew Morton , Ben Dooks , dakr@redhat.com Cc: linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-arch@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH v6 0/4] Regather scattered PCI-Code Date: Wed, 31 Jan 2024 10:00:19 +0100 Message-ID: <20240131090023.12331-1-pstanner@redhat.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 @Stable-Kernel: You receive this patch series because its first patch fixes a leak in PCI. @Bjorn: I decided that it's now actually possible to just embed the docu updates to the respective patches, instead of a separate patch. Also dropped the ioport_unmap() for now. Changes in v6: - Remove the addition of ioport_unmap() from patch #1, since this is not really a bug, as explained by the comment above pci_iounmap. (Bjorn) - Drop the patch unifying the two versions of pci_iounmap(). (Bjorn) - Make patch #4's style congruent with PCI style. - Drop (in any case empty) ioport_unmap() again from pci_iounmap() - Add forgotten updates to Documentation/ when moving files from lib/ to drivers/pci/ Changes in v5: - Add forgotten update to MAINTAINERS file. Changes in v4: - Apply Arnd's Reviewed-by's - Add ifdef CONFIG_HAS_IOPORT_MAP guard in drivers/pci/iomap.c (build error on openrisc) - Fix typo in patch no.5 Changes in v3: - Create a separate patch for the leaks in lib/iomap.c. Make it the series' first patch. (Arnd) - Turns out the aforementioned bug wasn't just accidentally removing iounmap() with the ifdef, it was also missing ioport_unmap() to begin with. Add it. - Move the ARCH_WANTS_GENERIC_IOMEM_IS_IOPORT-mechanism from asm-generic/io.h to asm-generic/ioport.h. (Arnd) - Adjust the implementation of iomem_is_ioport() in asm-generic/io.h so that it matches exactly what pci_iounmap() previously did in lib/pci_iomap.c. (Arnd) - Move the CONFIG_HAS_IOPORT guard in asm-generic/io.h so that iomem_is_ioport() will always be compiled and just returns false if there are no ports. - Add TODOs to several places informing about the generic iomem_is_ioport() in lib/iomap.c not being generic. - Add TODO about the followup work to make drivers/pci/iomap.c's pci_iounmap() actually generic. Changes in v2: - Replace patch 4, previously extending the comment about pci_iounmap() in lib/iomap.c, with a patch that moves pci_iounmap() from that file to drivers/pci/iomap.c, creating a unified version there. (Arnd) - Implement iomem_is_ioport() as a new helper in asm-generic/io.h and lib/iomap.c. (Arnd) - Move the build rule in drivers/pci/Makefile for iomap.o under the guard of #if PCI. This had to be done because when just checking for GENERIC_PCI_IOMAP being defined, the functions don't disappear, which was the case previously in lib/pci_iomap.c, where the entire file was made empty if PCI was not set by the guard #ifdef PCI. (Intel's Bots) - Rephares all patches' commit messages a little bit. Sooooooooo. I reworked v1. Please review this carefully, the IO-Ranges are obviously a bit tricky, as is the build-system / ifdef-ery. Arnd has suggested that architectures defining a custom inb() need their own iomem_is_ioport(), as well. I've grepped for inb() and found the following list of archs that define their own: - alpha - arm - m68k <-- - parisc - powerpc - sh - sparc - x86 <-- All of those have their own definitons of pci_iounmap(). Therefore, they don't need our generic version in the first place and, thus, also need no iomem_is_ioport(). The two exceptions are x86 and m68k. The former uses lib/iomap.c through CONFIG_GENERIC_IOMAP, as Arnd pointed out in the previous discussion (thus, CONFIG_GENERIC_IOMAP is not really generic in this regard). So as I see it, only m68k WOULD need its own custom definition of iomem_is_ioport(). But as I understand it it doesn't because it uses the one from asm-generic/pci_iomap.h ?? I wasn't entirely sure how to deal with the address ranges for the generic implementation in asm-generic/io.h. It's marked with a TODO. Input appreciated. I removed the guard around define pci_iounmap in asm-generic/io.h. An alternative would be to have it be guarded by CONFIG_GENERIC_IOMAP and CONFIG_GENERIC_PCI_IOMAP, both. Without such a guard, there is no collision however, because generic pci_iounmap() from drivers/pci/iomap.c will only get pulled in when CONFIG_GENERIC_PCI_IOMAP is actually set. I cross-built this for a variety of architectures, including the usual suspects (s390, m68k). So far successfully. But let's see what Intel's robots say :O P. Original cover letter: Hi! So it seems that since ca. 2007 the PCI code has been scattered a bit. PCI's devres code, which is only ever used by users of the entire PCI-subsystem anyways, resides in lib/devres.c and is guarded by an ifdef PCI, just as the content of lib/pci_iomap.c is. It, thus, seems reasonable to move all of that. As I were at it, I moved as much of the devres-specific code from pci.c to devres.c, too. The only exceptions are four functions that are currently difficult to move. More information about that can be read here [1]. I noticed these scattered files while working on (new) PCI-specific devres functions. If we can get this here merged, I'll soon send another patch series that addresses some API-inconsistencies and could move the devres-part of the four remaining functions. I don't want to do that in this series as this here is only about moving code, whereas the next series would have to actually change API behavior. I successfully (cross-)built this for x86, x86_64, AARCH64 and ARM (allyesconfig). I booted a kernel with it on x86_64, with a Fedora desktop environment as payload. The OS came up fine I hope this is OK. If we can get it in, we'd soon have a very consistent PCI API again. Regards, P. Philipp Stanner (4): lib/pci_iomap.c: fix cleanup bug in pci_iounmap() lib: move pci_iomap.c to drivers/pci/ lib: move pci-specific devres code to drivers/pci/ PCI: Move devres code from pci.c to devres.c Documentation/driver-api/device-io.rst | 2 +- Documentation/driver-api/pci/pci.rst | 6 + MAINTAINERS | 1 - drivers/pci/Kconfig | 5 + drivers/pci/Makefile | 3 +- drivers/pci/devres.c | 450 +++++++++++++++++++++++++ lib/pci_iomap.c => drivers/pci/iomap.c | 5 +- drivers/pci/pci.c | 249 -------------- drivers/pci/pci.h | 24 ++ lib/Kconfig | 3 - lib/Makefile | 1 - lib/devres.c | 208 +----------- 12 files changed, 490 insertions(+), 467 deletions(-) create mode 100644 drivers/pci/devres.c rename lib/pci_iomap.c => drivers/pci/iomap.c (99%)