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From: Mika Westerberg <mika.westerberg@linux.intel.com>
To: Bjorn Helgaas <bhelgaas@google.com>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Len Brown <lenb@kernel.org>,
	Mario.Limonciello@dell.com,
	Michael Jamet <michael.jamet@intel.com>,
	Yehezkel Bernat <YehezkelShB@gmail.com>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Lukas Wunner <lukas@wunner.de>,
	Mika Westerberg <mika.westerberg@linux.intel.com>,
	linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org
Subject: [PATCH v5 8/9] PCI: Improve "partially hidden behind bridge" log message
Date: Mon, 16 Apr 2018 13:34:52 +0300	[thread overview]
Message-ID: <20180416103453.46232-9-mika.westerberg@linux.intel.com> (raw)
In-Reply-To: <20180416103453.46232-1-mika.westerberg@linux.intel.com>

There is a sanity checker in the end of pci_scan_child_bus_extend() that
tries to detect badly configured bridges. For example given the below
topology:

  +-1b.0-[01-39]----00.0-[02-3a]--+-00.0-[03]----00.0
                                  +-01.0-[04-39]--
                                  \-02.0-[3a]----00.0

The sanity checker notices this and logs following messages:

  pci_bus 0000:3a: [bus 3a] partially hidden behind bridge 0000:02 [bus 02-39]
  pci_bus 0000:3a: [bus 3a] partially hidden behind bridge 0000:01 [bus 01-39]

This is not really helpful to users and the information above is not
even correct (0000:02 is a bus not bridge). Make this a bit more
understandable by changing the sanity checker to log following message
in place of the above two messages:

  pci 0000:02:02.0: devices behind bridge are unusable, because [bus 3a] cannot be assigned for them

While there update the comment on top of the sanity checker block to
make it clear that it is not only restricted to CardBus.

Suggested-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
---
 drivers/pci/probe.c | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 30a895bd9839..e71299ac1135 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1190,20 +1190,16 @@ static int pci_scan_bridge_extend(struct pci_bus *bus, struct pci_dev *dev,
 		(is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"),
 		pci_domain_nr(bus), child->number);
 
-	/* Has only triggered on CardBus, fixup is in yenta_socket */
+	/* Check that all devices are accessible */
 	while (bus->parent) {
 		if ((child->busn_res.end > bus->busn_res.end) ||
 		    (child->number > bus->busn_res.end) ||
 		    (child->number < bus->number) ||
 		    (child->busn_res.end < bus->number)) {
-			dev_info(&child->dev, "%pR %s hidden behind%s bridge %s %pR\n",
-				&child->busn_res,
-				(bus->number > child->busn_res.end &&
-				 bus->busn_res.end < child->number) ?
-					"wholly" : "partially",
-				bus->self->transparent ? " transparent" : "",
-				dev_name(&bus->dev),
-				&bus->busn_res);
+			dev_info(&dev->dev,
+				 "devices behind bridge are unusable, because %pR cannot be assigned for them\n",
+				 &child->busn_res);
+			break;
 		}
 		bus = bus->parent;
 	}
-- 
2.16.3


  parent reply	other threads:[~2018-04-16 10:34 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-16 10:34 [PATCH v5 0/9] PCI: Fixes and cleanups for native PCIe and ACPI hotplug Mika Westerberg
2018-04-16 10:34 ` [PATCH v5 1/9] PCI: Take all bridges into account when calculating bus numbers for extension Mika Westerberg
2018-04-16 10:34 ` [PATCH v5 2/9] PCI: Take bridge window alignment into account when distributing resources Mika Westerberg
2018-04-25 22:38   ` Bjorn Helgaas
2018-04-26 12:23     ` Mika Westerberg
2018-05-01 20:32       ` Bjorn Helgaas
2018-05-03 12:39         ` Mika Westerberg
2018-04-16 10:34 ` [PATCH v5 3/9] PCI: pciehp: Clear Presence Detect and Data Link Layer Status Changed on resume Mika Westerberg
2018-05-01 21:52   ` Bjorn Helgaas
2018-05-02 11:55     ` Mika Westerberg
2018-05-02 13:41       ` Bjorn Helgaas
2018-05-03 10:42         ` Mika Westerberg
2018-05-03 23:01           ` Bjorn Helgaas
2018-05-04  7:20             ` Mika Westerberg
2018-05-30 10:40             ` Lukas Wunner
2018-05-30 13:27               ` Mika Westerberg
2018-05-04  7:18     ` Lukas Wunner
2018-05-04  8:02       ` Mika Westerberg
2018-04-16 10:34 ` [PATCH v5 4/9] ACPI / hotplug / PCI: Do not scan all bridges when native PCIe hotplug is used Mika Westerberg
     [not found]   ` <20180502204932.GG11698@bhelgaas-glaptop.roam.corp.google.com>
2018-05-03 10:22     ` Mika Westerberg
2018-05-05  0:04       ` Bjorn Helgaas
2018-05-07 11:34         ` Mika Westerberg
2018-05-07 20:37           ` Bjorn Helgaas
2018-04-16 10:34 ` [PATCH v5 5/9] ACPI / hotplug / PCI: Mark stale PCI devices disconnected Mika Westerberg
2018-04-16 10:34 ` [PATCH v5 6/9] PCI: Move resource distribution for a single bridge outside of the loop Mika Westerberg
2018-04-24 23:05   ` Bjorn Helgaas
2018-04-25  7:29     ` Mika Westerberg
2018-04-16 10:34 ` [PATCH v5 7/9] PCI: Document return value of pci_scan_bridge() and pci_scan_bridge_extend() Mika Westerberg
2018-04-16 10:34 ` Mika Westerberg [this message]
2018-04-16 10:34 ` [PATCH v5 9/9] ACPI / hotplug / PCI: Drop unnecessary parentheses Mika Westerberg

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