f8cf6e513e
The sysfs_emit() and sysfs_emit_at() functions were introduced to make
it less ambiguous which function is preferred when writing to the output
buffer in a device attribute's "show" callback [1].
Convert the PCI sysfs object "show" functions from sprintf(), snprintf()
and scnprintf() to sysfs_emit() and sysfs_emit_at() accordingly, as the
latter is aware of the PAGE_SIZE buffer and correctly returns the number
of bytes written into the buffer.
No functional change intended.
[1] Documentation/filesystems/sysfs.rst
Related commit: ad025f8e46 ("PCI/sysfs: Use sysfs_emit() and
sysfs_emit_at() in "show" functions").
Link: https://lore.kernel.org/r/20210603000112.703037-2-kw@linux.com
Signed-off-by: Krzysztof Wilczyński <kw@linux.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
87 lines
2.5 KiB
C
87 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Compaq Hot Plug Controller Driver
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*
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* Copyright (c) 1995,2001 Compaq Computer Corporation
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* Copyright (c) 2001,2003 Greg Kroah-Hartman (greg@kroah.com)
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* Copyright (c) 2001 IBM Corp.
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*
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* All rights reserved.
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*
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* Send feedback to <greg@kroah.com>
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/pci.h>
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#include "shpchp.h"
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/* A few routines that create sysfs entries for the hot plug controller */
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static ssize_t show_ctrl(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct pci_dev *pdev;
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int index, busnr;
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struct resource *res;
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struct pci_bus *bus;
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size_t len = 0;
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pdev = to_pci_dev(dev);
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bus = pdev->subordinate;
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len += sysfs_emit_at(buf, len, "Free resources: memory\n");
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pci_bus_for_each_resource(bus, res, index) {
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if (res && (res->flags & IORESOURCE_MEM) &&
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!(res->flags & IORESOURCE_PREFETCH)) {
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len += sysfs_emit_at(buf, len,
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"start = %8.8llx, length = %8.8llx\n",
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(unsigned long long)res->start,
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(unsigned long long)resource_size(res));
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}
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}
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len += sysfs_emit_at(buf, len, "Free resources: prefetchable memory\n");
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pci_bus_for_each_resource(bus, res, index) {
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if (res && (res->flags & IORESOURCE_MEM) &&
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(res->flags & IORESOURCE_PREFETCH)) {
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len += sysfs_emit_at(buf, len,
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"start = %8.8llx, length = %8.8llx\n",
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(unsigned long long)res->start,
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(unsigned long long)resource_size(res));
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}
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}
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len += sysfs_emit_at(buf, len, "Free resources: IO\n");
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pci_bus_for_each_resource(bus, res, index) {
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if (res && (res->flags & IORESOURCE_IO)) {
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len += sysfs_emit_at(buf, len,
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"start = %8.8llx, length = %8.8llx\n",
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(unsigned long long)res->start,
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(unsigned long long)resource_size(res));
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}
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}
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len += sysfs_emit_at(buf, len, "Free resources: bus numbers\n");
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for (busnr = bus->busn_res.start; busnr <= bus->busn_res.end; busnr++) {
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if (!pci_find_bus(pci_domain_nr(bus), busnr))
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break;
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}
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if (busnr < bus->busn_res.end)
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len += sysfs_emit_at(buf, len,
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"start = %8.8x, length = %8.8x\n",
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busnr, (int)(bus->busn_res.end - busnr));
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return len;
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}
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static DEVICE_ATTR(ctrl, S_IRUGO, show_ctrl, NULL);
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int shpchp_create_ctrl_files(struct controller *ctrl)
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{
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return device_create_file(&ctrl->pci_dev->dev, &dev_attr_ctrl);
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}
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void shpchp_remove_ctrl_files(struct controller *ctrl)
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{
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device_remove_file(&ctrl->pci_dev->dev, &dev_attr_ctrl);
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}
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