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Message-ID: <20180809234830.GA30835@bombadil.infradead.org>
Date: Thu, 9 Aug 2018 16:48:30 -0700
From: Matthew Wilcox <willy@...radead.org>
To: Martin Mares <mj@....cz>, Logan Gunthorpe <logang@...tatee.com>
Cc: linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
linux-doc@...r.kernel.org, Stephen Bates <sbates@...thlin.com>,
Christoph Hellwig <hch@....de>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Jonathan Corbet <corbet@....net>,
Ingo Molnar <mingo@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
Marc Zyngier <marc.zyngier@....com>,
Kai-Heng Feng <kai.heng.feng@...onical.com>,
Frederic Weisbecker <frederic@...nel.org>,
Dan Williams <dan.j.williams@...el.com>,
Jérôme Glisse <jglisse@...hat.com>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Alex Williamson <alex.williamson@...hat.com>,
Christian König <christian.koenig@....com>
Subject: Re: lspci: Display path to device
Martin? Bjorn's looking to merge this soon and it'd be nice to have
the support in lspci too.
On Tue, Jul 17, 2018 at 01:39:00PM -0700, Matthew Wilcox wrote:
> 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 [<switches>]\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
> --
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