From patchwork Mon Dec 5 13:59:16 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Guilherme G. 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Violators will be prosecuted; Mon, 5 Dec 2016 11:59:17 -0200 Received: from d24relay02.br.ibm.com (d24relay02.br.ibm.com [9.18.232.42]) by d24dlp02.br.ibm.com (Postfix) with ESMTP id 218DE1DC006D for ; Mon, 5 Dec 2016 08:59:17 -0500 (EST) Received: from d24av01.br.ibm.com (d24av01.br.ibm.com [9.8.31.91]) by d24relay02.br.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id uB5DxHbZ38535408 for ; Mon, 5 Dec 2016 11:59:17 -0200 Received: from d24av01.br.ibm.com (localhost [127.0.0.1]) by d24av01.br.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id uB5DxG52007577 for ; Mon, 5 Dec 2016 11:59:16 -0200 Received: from localhost (HarryBosch.br.ibm.com [9.18.235.153]) by d24av01.br.ibm.com (8.14.4/8.14.4/NCO v10.0 AVin) with ESMTP id uB5DxGSw007574; Mon, 5 Dec 2016 11:59:16 -0200 From: "Guilherme G. Piccoli" To: linux-pci@vger.kernel.org, devicetree@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Subject: [PATCH v2] of/irq: improve error report on irq discovery process failure Date: Mon, 5 Dec 2016 11:59:16 -0200 X-Mailer: git-send-email 2.1.0 X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16120513-0032-0000-0000-00000520AE05 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 16120513-0033-0000-0000-000011A12CF5 Message-Id: <1480946356-16778-1-git-send-email-gpiccoli@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2016-12-05_10:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1609300000 definitions=main-1612050226 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, gpiccoli@linux.vnet.ibm.com, marc.zyngier@arm.com, robh+dt@kernel.org, frowand.list@gmail.com Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" On PowerPC machines some PCI slots might not have level triggered interrupts capability (also know as level signaled interrupts), leading of_irq_parse_pci() to complain by presenting error messages on the kernel log - in this case, the properties "interrupt-map" and "interrupt-map-mask" are not present on device's node in the device tree. This patch introduces a different message for this specific case, and also reduces its level from error to warning. Besides, we warn (once) that possibly some PCI slots on the system have no level triggered interrupts available. We changed some error return codes too on function of_irq_parse_raw() in order other failure's cases can be presented in a more precise way. Before this patch, when an adapter was plugged in a slot without level interrupts capabilitiy on PowerPC, we saw a generic error message like this: [54.239] pci 002d:70:00.0: of_irq_parse_pci() failed with rc=-22 Now, with this applied, we see the following specific message: [16.154] pci 0014:60:00.1: of_irq_parse_pci: no interrupt-map found, INTx interrupts not available Finally, we standardize the error path in of_irq_parse_raw() by always taking the fail path instead of returning directly from the loop. Signed-off-by: Guilherme G. Piccoli --- v2: * Changed function return code to always return negative values; * Improved/simplified warning outputs; * Changed some return codes and some error paths in of_irq_parse_raw() in order to be more precise/consistent; drivers/of/irq.c | 19 ++++++++++++------- drivers/of/of_pci_irq.c | 10 +++++++++- 2 files changed, 21 insertions(+), 8 deletions(-) diff --git a/drivers/of/irq.c b/drivers/of/irq.c index 393fea8..9deee86 100644 --- a/drivers/of/irq.c +++ b/drivers/of/irq.c @@ -104,7 +104,7 @@ int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq) const __be32 *match_array = initial_match_array; const __be32 *tmp, *imap, *imask, dummy_imask[] = { [0 ... MAX_PHANDLE_ARGS] = ~0 }; u32 intsize = 1, addrsize, newintsize = 0, newaddrsize = 0; - int imaplen, match, i; + int imaplen, match, i, rc = -EINVAL; #ifdef DEBUG of_print_phandle_args("of_irq_parse_raw: ", out_irq); @@ -134,7 +134,7 @@ int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq) pr_debug("of_irq_parse_raw: ipar=%s, size=%d\n", of_node_full_name(ipar), intsize); if (out_irq->args_count != intsize) - return -EINVAL; + goto fail; /* Look for this #address-cells. We have to implement the old linux * trick of looking for the parent here as some device-trees rely on it @@ -153,8 +153,10 @@ int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq) pr_debug(" -> addrsize=%d\n", addrsize); /* Range check so that the temporary buffer doesn't overflow */ - if (WARN_ON(addrsize + intsize > MAX_PHANDLE_ARGS)) + if (WARN_ON(addrsize + intsize > MAX_PHANDLE_ARGS)) { + rc = -EFAULT; goto fail; + } /* Precalculate the match array - this simplifies match loop */ for (i = 0; i < addrsize; i++) @@ -240,10 +242,11 @@ int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq) newintsize, newaddrsize); /* Check for malformed properties */ - if (WARN_ON(newaddrsize + newintsize > MAX_PHANDLE_ARGS)) - goto fail; - if (imaplen < (newaddrsize + newintsize)) + if (WARN_ON(newaddrsize + newintsize > MAX_PHANDLE_ARGS) + || (imaplen < (newaddrsize + newintsize))) { + rc = -EFAULT; goto fail; + } imap += newaddrsize + newintsize; imaplen -= newaddrsize + newintsize; @@ -271,11 +274,13 @@ int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq) ipar = newpar; newpar = NULL; } + rc = -ENOENT; /* No interrupt-map found */ + fail: of_node_put(ipar); of_node_put(newpar); - return -EINVAL; + return rc; } EXPORT_SYMBOL_GPL(of_irq_parse_raw); diff --git a/drivers/of/of_pci_irq.c b/drivers/of/of_pci_irq.c index 2306313..c175d9c 100644 --- a/drivers/of/of_pci_irq.c +++ b/drivers/of/of_pci_irq.c @@ -93,7 +93,15 @@ int of_irq_parse_pci(const struct pci_dev *pdev, struct of_phandle_args *out_irq goto err; return 0; err: - dev_err(&pdev->dev, "of_irq_parse_pci() failed with rc=%d\n", rc); + if (rc == -ENOENT) { + dev_warn(&pdev->dev, + "%s: no interrupt-map found, INTx interrupts not available\n", + __func__); + pr_warn_once("%s: possibly some PCI slots don't have level triggered interrupts capability\n", + __func__); + } else { + dev_err(&pdev->dev, "%s: failed with rc=%d\n", __func__, rc); + } return rc; } EXPORT_SYMBOL_GPL(of_irq_parse_pci);