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PCI/sysfs: Compile pci-sysfs.c only if CONFIG_SYSFS=y

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It is possible to enable CONFIG_PCI but disable CONFIG_SYSFS and for
space-constrained devices such as routers, such a configuration may
actually make sense.

However pci-sysfs.c is compiled even if CONFIG_SYSFS is disabled,
unnecessarily increasing the kernel's size.

To rectify that:

* Move pci_mmap_fits() to mmap.c.  It is not only needed by
  pci-sysfs.c, but also proc.c.

* Move pci_dev_type to probe.c and make it private.  It references
  pci_dev_attr_groups in pci-sysfs.c.  Make that public instead for
  consistency with pci_dev_groups, pcibus_groups and pci_bus_groups,
  which are likewise public and referenced by struct definitions in
  pci-driver.c and probe.c.

* Define pci_dev_groups, pci_dev_attr_groups, pcibus_groups and
  pci_bus_groups to NULL if CONFIG_SYSFS is disabled.  Provide empty
  static inlines for pci_{create,remove}_legacy_files() and
  pci_{create,remove}_sysfs_dev_files().

Result:

vmlinux size is reduced by 122996 bytes in my arm 32-bit test build.

Link: https://lore.kernel.org/r/85ca95ae8e4d57ccf082c5c069b8b21eb141846e.1698668982.git.lukas@wunner.de
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Lukas Wunner 2023-10-30 13:32:12 +01:00 committed by Bjorn Helgaas
parent 6613476e22
commit be9c3a4c8b
5 changed files with 50 additions and 34 deletions
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4
drivers/pci/Makefile
View file

@ -4,7 +4,7 @@
obj-$(CONFIG_PCI) += access.o bus.o probe.o host-bridge.o \
remove.o pci.o pci-driver.o search.o \
pci-sysfs.o rom.o setup-res.o irq.o vpd.o \
rom.o setup-res.o irq.o vpd.o \
setup-bus.o vc.o mmap.o setup-irq.o
obj-$(CONFIG_PCI) += msi/
@ -12,7 +12,7 @@ obj-$(CONFIG_PCI) += pcie/
ifdef CONFIG_PCI
obj-$(CONFIG_PROC_FS) += proc.o
obj-$(CONFIG_SYSFS) += slot.o
obj-$(CONFIG_SYSFS) += pci-sysfs.o slot.o
obj-$(CONFIG_ACPI) += pci-acpi.o
endif

29
drivers/pci/mmap.c
View file

@ -11,6 +11,8 @@
#include <linux/mm.h>
#include <linux/pci.h>
#include "pci.h"
#ifdef ARCH_GENERIC_PCI_MMAP_RESOURCE
static const struct vm_operations_struct pci_phys_vm_ops = {
@ -50,3 +52,30 @@ int pci_mmap_resource_range(struct pci_dev *pdev, int bar,
}
#endif
#if (defined(CONFIG_SYSFS) || defined(CONFIG_PROC_FS)) && \
(defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE))
int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
enum pci_mmap_api mmap_api)
{
resource_size_t pci_start = 0, pci_end;
unsigned long nr, start, size;
if (pci_resource_len(pdev, resno) == 0)
return 0;
nr = vma_pages(vma);
start = vma->vm_pgoff;
size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
if (mmap_api == PCI_MMAP_PROCFS) {
pci_resource_to_user(pdev, resno, &pdev->resource[resno],
&pci_start, &pci_end);
pci_start >>= PAGE_SHIFT;
}
if (start >= pci_start && start < pci_start + size &&
start + nr <= pci_start + size)
return 1;
return 0;
}
#endif

29
drivers/pci/pci-sysfs.c
View file

@ -1022,29 +1022,6 @@ void pci_remove_legacy_files(struct pci_bus *b)
#endif /* HAVE_PCI_LEGACY */
#if defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)
int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
enum pci_mmap_api mmap_api)
{
unsigned long nr, start, size;
resource_size_t pci_start = 0, pci_end;
if (pci_resource_len(pdev, resno) == 0)
return 0;
nr = vma_pages(vma);
start = vma->vm_pgoff;
size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
if (mmap_api == PCI_MMAP_PROCFS) {
pci_resource_to_user(pdev, resno, &pdev->resource[resno],
&pci_start, &pci_end);
pci_start >>= PAGE_SHIFT;
}
if (start >= pci_start && start < pci_start + size &&
start + nr <= pci_start + size)
return 1;
return 0;
}
/**
* pci_mmap_resource - map a PCI resource into user memory space
* @kobj: kobject for mapping
@ -1660,7 +1637,7 @@ static const struct attribute_group pcie_dev_attr_group = {
.is_visible = pcie_dev_attrs_are_visible,
};
static const struct attribute_group *pci_dev_attr_groups[] = {
const struct attribute_group *pci_dev_attr_groups[] = {
&pci_dev_attr_group,
&pci_dev_hp_attr_group,
#ifdef CONFIG_PCI_IOV
@ -1677,7 +1654,3 @@ static const struct attribute_group *pci_dev_attr_groups[] = {
#endif
NULL,
};
const struct device_type pci_dev_type = {
.groups = pci_dev_attr_groups,
};

18
drivers/pci/pci.h
View file

@ -31,8 +31,6 @@ bool pcie_cap_has_rtctl(const struct pci_dev *dev);
/* Functions internal to the PCI core code */
int pci_create_sysfs_dev_files(struct pci_dev *pdev);
void pci_remove_sysfs_dev_files(struct pci_dev *pdev);
void pci_cleanup_rom(struct pci_dev *dev);
#ifdef CONFIG_DMI
extern const struct attribute_group pci_dev_smbios_attr_group;
@ -152,7 +150,7 @@ static inline int pci_proc_detach_bus(struct pci_bus *bus) { return 0; }
/* Functions for PCI Hotplug drivers to use */
int pci_hp_add_bridge(struct pci_dev *dev);
#ifdef HAVE_PCI_LEGACY
#if defined(CONFIG_SYSFS) && defined(HAVE_PCI_LEGACY)
void pci_create_legacy_files(struct pci_bus *bus);
void pci_remove_legacy_files(struct pci_bus *bus);
#else
@ -185,10 +183,22 @@ static inline int pci_no_d1d2(struct pci_dev *dev)
return (dev->no_d1d2 || parent_dstates);
}
#ifdef CONFIG_SYSFS
int pci_create_sysfs_dev_files(struct pci_dev *pdev);
void pci_remove_sysfs_dev_files(struct pci_dev *pdev);
extern const struct attribute_group *pci_dev_groups[];
extern const struct attribute_group *pci_dev_attr_groups[];
extern const struct attribute_group *pcibus_groups[];
extern const struct device_type pci_dev_type;
extern const struct attribute_group *pci_bus_groups[];
#else
static inline int pci_create_sysfs_dev_files(struct pci_dev *pdev) { return 0; }
static inline void pci_remove_sysfs_dev_files(struct pci_dev *pdev) { }
#define pci_dev_groups NULL
#define pci_dev_attr_groups NULL
#define pcibus_groups NULL
#define pci_bus_groups NULL
#endif
extern unsigned long pci_hotplug_io_size;
extern unsigned long pci_hotplug_mmio_size;

4
drivers/pci/probe.c
View file

@ -2357,6 +2357,10 @@ static void pci_release_dev(struct device *dev)
kfree(pci_dev);
}
static const struct device_type pci_dev_type = {
.groups = pci_dev_attr_groups,
};
struct pci_dev *pci_alloc_dev(struct pci_bus *bus)
{
struct pci_dev *dev;