From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from bombadil.infradead.org ([198.137.202.133]:52530 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729714AbeGQVNZ (ORCPT ); Tue, 17 Jul 2018 17:13:25 -0400 Date: Tue, 17 Jul 2018 13:39:00 -0700 From: Matthew Wilcox To: Martin Mares , Logan Gunthorpe Cc: linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-doc@vger.kernel.org, Stephen Bates , Christoph Hellwig , Bjorn Helgaas , Jonathan Corbet , Ingo Molnar , Thomas Gleixner , "Paul E. McKenney" , Marc Zyngier , Kai-Heng Feng , Frederic Weisbecker , Dan Williams , =?iso-8859-1?B?Suly9G1l?= Glisse , Benjamin Herrenschmidt , Alex Williamson , Christian =?iso-8859-1?Q?K=F6nig?= Subject: lspci: Display path to device Message-ID: <20180717203900.GA1771@bombadil.infradead.org> References: <20180717170204.30470-1-logang@deltatee.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <20180717170204.30470-1-logang@deltatee.com> Sender: linux-pci-owner@vger.kernel.org List-ID: On Tue, Jul 17, 2018 at 11:02:00AM -0600, Logan Gunthorpe wrote: > The second patch expands the new helper to optionally take a path of > PCI devfns. This is to address Alex's renumbering concern when using > simple bus-devfns. The implementation is essentially how he described it and > similar to the Intel VT-d spec (Section 8.3.1). I don't like telling the user to grovel around lspci -t by hand. It's not many lines of code to add a new -P option to lspci to show the path to each device instead of bus:dev.fn Here's three examples, first without, then with -P. (my laptop): 6d:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller SM961/PM961 00:1d.0/00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller SM961/PM961 (tests/PCI-X-bridges-and-domains): 0002:42:00.0 Ethernet controller: Trident Microsystems 4DWave DX (rev 26) 0002:00:02.4/01.0/00.0 Ethernet controller: Trident Microsystems 4DWave DX (rev 26) (my Nehalem system): 04:00.0 Serial Attached SCSI controller: LSI Logic / Symbios Logic SAS2008 PCI-Express Fusion-MPT SAS-2 [Falcon] (rev 02) 00:03.0/00.0/00.0/00.0 Serial Attached SCSI controller: LSI Logic / Symbios Logic SAS2008 PCI-Express Fusion-MPT SAS-2 [Falcon] (rev 02) The Nehalem system makes an interesting testcase because it exposes some registers in fake PCIe devices that aren't behind the root ports. eg: ff:06.3 Host bridge: Intel Corporation Xeon 5500/Core i7 Integrated Memory Controller Channel 2 Thermal Control Registers (rev 04) Martin, what do you think to this patch? Also, I'm happy to send you the lspci -xxxx from the Nehalem system to add to tests/ diff --git a/lspci.c b/lspci.c index 3bf1925..ae0fdd2 100644 --- a/lspci.c +++ b/lspci.c @@ -19,6 +19,7 @@ int verbose; /* Show detailed information */ static int opt_hex; /* Show contents of config space as hexadecimal numbers */ struct pci_filter filter; /* Device filter */ static int opt_tree; /* Show bus tree */ +static int opt_path; /* Show bridge path */ static int opt_machine; /* Generate machine-readable output */ static int opt_map_mode; /* Bus mapping mode enabled */ static int opt_domains; /* Show domain numbers (0=disabled, 1=auto-detected, 2=requested) */ @@ -29,7 +30,7 @@ char *opt_pcimap; /* Override path to Linux modules.pcimap */ const char program_name[] = "lspci"; -static char options[] = "nvbxs:d:ti:mgp:qkMDQ" GENERIC_OPTIONS ; +static char options[] = "nvbxs:d:tPi:mgp:qkMDQ" GENERIC_OPTIONS ; static char help_msg[] = "Usage: lspci []\n" @@ -247,6 +248,34 @@ sort_them(void) /*** Normal output ***/ +static void +show_slot_path(struct pci_dev *p) +{ + struct pci_dev *d = NULL; + + if (opt_path && p->bus) + { + for (d = p->access->devices; d; d = d->next) { + if (d->hdrtype == -1) + d->hdrtype = pci_read_byte(d, PCI_HEADER_TYPE) & 0x7f; + if (d->hdrtype != PCI_HEADER_TYPE_BRIDGE && + d->hdrtype != PCI_HEADER_TYPE_CARDBUS) + continue; + if (pci_read_byte(d, PCI_SECONDARY_BUS) > p->bus) + continue; + if (pci_read_byte(d, PCI_SUBORDINATE_BUS) < p->bus) + continue; + show_slot_path(d); + break; + } + } + + if (d) + printf("/%02x.%d", p->dev, p->func); + else + printf("%02x:%02x.%d", p->bus, p->dev, p->func); +} + static void show_slot_name(struct device *d) { @@ -254,7 +283,7 @@ show_slot_name(struct device *d) if (!opt_machine ? opt_domains : (p->domain || opt_domains >= 2)) printf("%04x:", p->domain); - printf("%02x:%02x.%d", p->bus, p->dev, p->func); + show_slot_path(p); } void @@ -989,6 +1018,9 @@ main(int argc, char **argv) case 'x': opt_hex++; break; + case 'P': + opt_path++; + break; case 't': opt_tree++; break; diff --git a/lspci.man b/lspci.man index 35b3620..565dd5b 100644 --- a/lspci.man +++ b/lspci.man @@ -95,6 +95,9 @@ PCI bus instead of as seen by the kernel. .B -D Always show PCI domain numbers. By default, lspci suppresses them on machines which have only domain 0. +.TP +.B -P +Name PCI devices by path through each bridge, instead of by bus number. .SS Options to control resolving ID's to names .TP