linux-kernel - [PATCH pci-next] pci: remap: keep both device name and resource name for config space

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Message-ID: <JvyOzv8K8n5CCdP1xfLOdOWh4AbFrXdMMOEExr6em8@cp4-web-036.plabs.ch>
Date:   Thu, 19 Nov 2020 19:04:42 +0000
From:   Alexander Lobakin <alobakin@...me>
To:     Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alexander Lobakin <alobakin@...me>
Subject: [PATCH pci-next] pci: remap: keep both device name and resource name for config space

Follow the rule taken in commit 35bd8c07db2c
("devres: keep both device name and resource name in pretty name")
and keep both device and resource names while requesting memory
regions for PCI config space to prettify e.g. /proc/iomem output:

Before (DWC Host Controller):

18b00000-18b01fff : dbi
18b10000-18b11fff : config
18b20000-18b21fff : dbi
18b30000-18b31fff : config
19000000-19ffffff : pci@...00000
  19000000-190fffff : PCI Bus 0000:01
    19000000-1900ffff : 0000:01:00.0
  19100000-191fffff : PCI Bus 0000:01
1a000000-1affffff : pci@...20000
  1a000000-1a0fffff : PCI Bus 0001:01
    1a000000-1a00ffff : 0001:01:00.0
  1a100000-1a1fffff : PCI Bus 0001:01

After:

18b00000-18b01fff : 18b00000.pci dbi
18b10000-18b11fff : 18b00000.pci config
18b20000-18b21fff : 18b20000.pci dbi
18b30000-18b31fff : 18b20000.pci config
19000000-19ffffff : pci@...00000
  19000000-190fffff : PCI Bus 0000:01
    19000000-1900ffff : 0000:01:00.0
  19100000-191fffff : PCI Bus 0000:01
1a000000-1affffff : pci@...20000
  1a000000-1a0fffff : PCI Bus 0001:01
    1a000000-1a00ffff : 0001:01:00.0
  1a100000-1a1fffff : PCI Bus 0001:01

Signed-off-by: Alexander Lobakin <alobakin@...me>
---
 drivers/pci/pci.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index e578d34095e9..0716691f7d14 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -4188,7 +4188,14 @@ void __iomem *devm_pci_remap_cfg_resource(struct device *dev,
 	}
 
 	size = resource_size(res);
-	name = res->name ?: dev_name(dev);
+
+	if (res->name)
+		name = devm_kasprintf(dev, GFP_KERNEL, "%s %s", dev_name(dev),
+				      res->name);
+	else
+		name = devm_kstrdup(dev, dev_name(dev), GFP_KERNEL);
+	if (!name)
+		return IOMEM_ERR_PTR(-ENOMEM);
 
 	if (!devm_request_mem_region(dev, res->start, size, name)) {
 		dev_err(dev, "can't request region for resource %pR\n", res);
-- 
2.29.2