From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 2FBAEC433F5 for ; Mon, 6 Dec 2021 22:29:15 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4J7J4n4XLmz3cVh for ; Tue, 7 Dec 2021 09:29:13 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; secure) header.d=linutronix.de header.i=@linutronix.de header.a=rsa-sha256 header.s=2020 header.b=cLSzakHM; dkim=fail reason="signature verification failed" header.d=linutronix.de header.i=@linutronix.de header.a=ed25519-sha256 header.s=2020e header.b=AC1UyRei; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=linutronix.de (client-ip=2a0a:51c0:0:12e:550::1; helo=galois.linutronix.de; envelope-from=tglx@linutronix.de; receiver=) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; secure) header.d=linutronix.de header.i=@linutronix.de header.a=rsa-sha256 header.s=2020 header.b=cLSzakHM; dkim=pass header.d=linutronix.de header.i=@linutronix.de header.a=ed25519-sha256 header.s=2020e header.b=AC1UyRei; dkim-atps=neutral Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4J7J2r38qXz2xYL for ; Tue, 7 Dec 2021 09:27:32 +1100 (AEDT) Message-ID: <20211206210223.929792157@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1638829647; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=wYOapsewmvCjRKNhvhV0vpzUO9z80CJEqQBEg5ZWMSo=; b=cLSzakHMaYNtI4aJ6BLkP0Y1ckKByNqQRdbeialjjHb7VsdJKr1LXNnGFwD5jPorL/dB3X r8LL7BBEXT9ttMDduYesmAWnKu89MMUh+WbP//3UR9Oqi8u6Ke9f0j6kvDzk55pgKJlLw8 pXM/pbZ+DKZAxpGnovR5d0BXBdradoJwITrMoZLhwgv5vAP0K0ZMzZys/cJmxk0kAoxLqB 9HeDnDnYxU3SNfvQbR+KwVpjQ6g9EPn1CLChmqViSe3oPCpxc2+ZyZ9945UmAuQkVFQb/B Ms+5OGgiP91cMgej9Fb+5+mTuU/pnBqgmKdO+oCNOau73VDp3kwOD/z+rrVPrQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1638829647; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=wYOapsewmvCjRKNhvhV0vpzUO9z80CJEqQBEg5ZWMSo=; b=AC1UyRei3djvmFCd8sCxirgN9BF19ZHUhoSg/ujiTsv7YGfDjxkFl5ncJxZvQt8R7ZWn4X QnYXgZVa/LFvUdBg== From: Thomas Gleixner To: LKML Subject: [patch V2 02/23] PCI/MSI: Fix pci_irq_vector()/pci_irq_get_affinity() References: <20211206210147.872865823@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Date: Mon, 6 Dec 2021 23:27:26 +0100 (CET) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-hyperv@vger.kernel.org, Paul Mackerras , sparclinux@vger.kernel.org, Wei Liu , Ashok Raj , x86@kernel.org, Christian Borntraeger , Bjorn Helgaas , Megha Dey , Jason Gunthorpe , linux-pci@vger.kernel.org, xen-devel@lists.xenproject.org, ath11k@lists.infradead.org, Kevin Tian , Heiko Carstens , Alex Williamson , Cedric Le Goater , Kalle Valo , Juergen Gross , Thomas Bogendoerfer , Greg Kroah-Hartman , linux-mips@vger.kernel.org, Marc Zygnier , linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" pci_irq_vector() and pci_irq_get_affinity() use the list position to find the MSI-X descriptor at a given index. That's correct for the normal case where the entry number is the same as the list position. But it's wrong for cases where MSI-X was allocated with an entries array describing sparse entry numbers into the hardware message descriptor table. That's inconsistent at best. Make it always check the entry number because that's what the zero base index really means. This change won't break existing users which use a sparse entries array for allocation because these users retrieve the Linux interrupt number from the entries array after allocation and none of them uses pci_irq_vector() or pci_irq_get_affinity(). Fixes: aff171641d18 ("PCI: Provide sensible IRQ vector alloc/free routines") Signed-off-by: Thomas Gleixner Tested-by: Juergen Gross Reviewed-by: Jason Gunthorpe --- V2: Fix typo in subject - Jason --- drivers/pci/msi.c | 26 ++++++++++++++++++-------- 1 file changed, 18 insertions(+), 8 deletions(-) --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -1187,19 +1187,24 @@ EXPORT_SYMBOL(pci_free_irq_vectors); /** * pci_irq_vector - return Linux IRQ number of a device vector - * @dev: PCI device to operate on - * @nr: device-relative interrupt vector index (0-based). + * @dev: PCI device to operate on + * @nr: Interrupt vector index (0-based) + * + * @nr has the following meanings depending on the interrupt mode: + * MSI-X: The index in the MSI-X vector table + * MSI: The index of the enabled MSI vectors + * INTx: Must be 0 + * + * Return: The Linux interrupt number or -EINVAl if @nr is out of range. */ int pci_irq_vector(struct pci_dev *dev, unsigned int nr) { if (dev->msix_enabled) { struct msi_desc *entry; - int i = 0; for_each_pci_msi_entry(entry, dev) { - if (i == nr) + if (entry->msi_attrib.entry_nr == nr) return entry->irq; - i++; } WARN_ON_ONCE(1); return -EINVAL; @@ -1223,17 +1228,22 @@ EXPORT_SYMBOL(pci_irq_vector); * pci_irq_get_affinity - return the affinity of a particular MSI vector * @dev: PCI device to operate on * @nr: device-relative interrupt vector index (0-based). + * + * @nr has the following meanings depending on the interrupt mode: + * MSI-X: The index in the MSI-X vector table + * MSI: The index of the enabled MSI vectors + * INTx: Must be 0 + * + * Return: A cpumask pointer or NULL if @nr is out of range */ const struct cpumask *pci_irq_get_affinity(struct pci_dev *dev, int nr) { if (dev->msix_enabled) { struct msi_desc *entry; - int i = 0; for_each_pci_msi_entry(entry, dev) { - if (i == nr) + if (entry->msi_attrib.entry_nr == nr) return &entry->affinity->mask; - i++; } WARN_ON_ONCE(1); return NULL;