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Code Issues Releases Wiki Activity

PCI: Introduce pci_dev_for_each_resource() 

Instead of open-coding it everywhere introduce a tiny helper that can be
used to iterate over each resource of a PCI device, and convert the most
obvious users into it.

While at it drop doubled empty line before pdev_sort_resources().

No functional changes intended.

Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20230330162434.35055-4-andriy.shevchenko@linux.intel.com
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Krzysztof Wilczyński <kw@linux.com>
This commit is contained in:
Mika Westerberg 2023-03-30 19:24:30 +03:00 committed by Bjorn Helgaas
parent 144d204df7
commit 09cc900632
23 changed files with 111 additions and 132 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
.clang-format
View File

@ -520,6 +520,7 @@ ForEachMacros:
- 'of_property_for_each_string'
- 'of_property_for_each_u32'
- 'pci_bus_for_each_resource'
- 'pci_dev_for_each_resource'
- 'pci_doe_for_each_off'
- 'pcl_for_each_chunk'
- 'pcl_for_each_segment'

5
arch/alpha/kernel/pci.c
View File

@ -288,11 +288,10 @@ pcibios_claim_one_bus(struct pci_bus *b)
struct pci_bus *child_bus;
list_for_each_entry(dev, &b->devices, bus_list) {
struct resource *r;
int i;
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
struct resource *r = &dev->resource[i];
pci_dev_for_each_resource(dev, r, i) {
if (r->parent || !r->start || !r->flags)
continue;
if (pci_has_flag(PCI_PROBE_ONLY) ||

16
arch/arm/kernel/bios32.c
View File

@ -142,15 +142,15 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_WINBOND2, PCI_DEVICE_ID_WINBOND2_89C940F,
*/
static void pci_fixup_dec21285(struct pci_dev *dev)
{
int i;
if (dev->devfn == 0) {
struct resource *r;
dev->class &= 0xff;
dev->class |= PCI_CLASS_BRIDGE_HOST << 8;
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
dev->resource[i].start = 0;
dev->resource[i].end = 0;
dev->resource[i].flags = 0;
pci_dev_for_each_resource(dev, r) {
r->start = 0;
r->end = 0;
r->flags = 0;
}
}
}
@ -162,13 +162,11 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_21285, pci_fixup_d
static void pci_fixup_ide_bases(struct pci_dev *dev)
{
struct resource *r;
int i;
if ((dev->class >> 8) != PCI_CLASS_STORAGE_IDE)
return;
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
r = dev->resource + i;
pci_dev_for_each_resource(dev, r) {
if ((r->start & ~0x80) == 0x374) {
r->start |= 2;
r->end = r->start;

10
arch/arm/mach-dove/pcie.c
View File

@ -142,14 +142,14 @@ static struct pci_ops pcie_ops = {
static void rc_pci_fixup(struct pci_dev *dev)
{
if (dev->bus->parent == NULL && dev->devfn == 0) {
int i;
struct resource *r;
dev->class &= 0xff;
dev->class |= PCI_CLASS_BRIDGE_HOST << 8;
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
dev->resource[i].start = 0;
dev->resource[i].end = 0;
dev->resource[i].flags = 0;
pci_dev_for_each_resource(dev, r) {
r->start = 0;
r->end = 0;
r->flags = 0;
}
}
}

10
arch/arm/mach-mv78xx0/pcie.c
View File

@ -186,14 +186,14 @@ static struct pci_ops pcie_ops = {
static void rc_pci_fixup(struct pci_dev *dev)
{
if (dev->bus->parent == NULL && dev->devfn == 0) {
int i;
struct resource *r;
dev->class &= 0xff;
dev->class |= PCI_CLASS_BRIDGE_HOST << 8;
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
dev->resource[i].start = 0;
dev->resource[i].end = 0;
dev->resource[i].flags = 0;
pci_dev_for_each_resource(dev, r) {
r->start = 0;
r->end = 0;
r->flags = 0;
}
}
}

10
arch/arm/mach-orion5x/pci.c
View File

@ -522,14 +522,14 @@ static int __init pci_setup(struct pci_sys_data *sys)
static void rc_pci_fixup(struct pci_dev *dev)
{
if (dev->bus->parent == NULL && dev->devfn == 0) {
int i;
struct resource *r;
dev->class &= 0xff;
dev->class |= PCI_CLASS_BRIDGE_HOST << 8;
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
dev->resource[i].start = 0;
dev->resource[i].end = 0;
dev->resource[i].flags = 0;
pci_dev_for_each_resource(dev, r) {
r->start = 0;
r->end = 0;
r->flags = 0;
}
}
}

8
arch/mips/pci/ops-bcm63xx.c
View File

@ -413,18 +413,18 @@ struct pci_ops bcm63xx_cb_ops = {
static void bcm63xx_fixup(struct pci_dev *dev)
{
static int io_window = -1;
int i, found, new_io_window;
int found, new_io_window;
struct resource *r;
u32 val;
/* look for any io resource */
found = 0;
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
if (pci_resource_flags(dev, i) & IORESOURCE_IO) {
pci_dev_for_each_resource(dev, r) {
if (resource_type(r) == IORESOURCE_IO) {
found = 1;
break;
}
}
if (!found)
return;

3
arch/mips/pci/pci-legacy.c
View File

@ -249,12 +249,11 @@ static int pcibios_enable_resources(struct pci_dev *dev, int mask)
pci_read_config_word(dev, PCI_COMMAND, &cmd);
old_cmd = cmd;
for (idx = 0; idx < PCI_NUM_RESOURCES; idx++) {
pci_dev_for_each_resource(dev, r, idx) {
/* Only set up the requested stuff */
if (!(mask & (1<<idx)))
continue;
r = &dev->resource[idx];
if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
continue;
if ((idx == PCI_ROM_RESOURCE) &&

21
arch/powerpc/kernel/pci-common.c
View File

@ -880,6 +880,7 @@ int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
static void pcibios_fixup_resources(struct pci_dev *dev)
{
struct pci_controller *hose = pci_bus_to_host(dev->bus);
struct resource *res;
int i;
if (!hose) {
@ -891,9 +892,9 @@ static void pcibios_fixup_resources(struct pci_dev *dev)
if (dev->is_virtfn)
return;
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
struct resource *res = dev->resource + i;
pci_dev_for_each_resource(dev, res, i) {
struct pci_bus_region reg;
if (!res->flags)
continue;
@ -1452,11 +1453,10 @@ void pcibios_claim_one_bus(struct pci_bus *bus)
struct pci_bus *child_bus;
list_for_each_entry(dev, &bus->devices, bus_list) {
struct resource *r;
int i;
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
struct resource *r = &dev->resource[i];
pci_dev_for_each_resource(dev, r, i) {
if (r->parent || !r->start || !r->flags)
continue;
@ -1705,19 +1705,20 @@ EXPORT_SYMBOL_GPL(pcibios_scan_phb);
static void fixup_hide_host_resource_fsl(struct pci_dev *dev)
{
int i, class = dev->class >> 8;
int class = dev->class >> 8;
/* When configured as agent, programming interface = 1 */
int prog_if = dev->class & 0xf;
struct resource *r;
if ((class == PCI_CLASS_PROCESSOR_POWERPC ||
class == PCI_CLASS_BRIDGE_OTHER) &&
(dev->hdr_type == PCI_HEADER_TYPE_NORMAL) &&
(prog_if == 0) &&
(dev->bus->parent == NULL)) {
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
dev->resource[i].start = 0;
dev->resource[i].end = 0;
dev->resource[i].flags = 0;
pci_dev_for_each_resource(dev, r) {
r->start = 0;
r->end = 0;
r->flags = 0;
}
}
}

8
arch/powerpc/platforms/4xx/pci.c
View File

@ -57,7 +57,7 @@ static inline int ppc440spe_revA(void)
static void fixup_ppc4xx_pci_bridge(struct pci_dev *dev)
{
struct pci_controller *hose;
int i;
struct resource *r;
if (dev->devfn != 0 || dev->bus->self != NULL)
return;
@ -79,9 +79,9 @@ static void fixup_ppc4xx_pci_bridge(struct pci_dev *dev)
/* Hide the PCI host BARs from the kernel as their content doesn't
* fit well in the resource management
*/
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
dev->resource[i].start = dev->resource[i].end = 0;
dev->resource[i].flags = 0;
pci_dev_for_each_resource(dev, r) {
r->start = r->end = 0;
r->flags = 0;
}
printk(KERN_INFO "PCI: Hiding 4xx host bridge resources %s\n",

5
arch/powerpc/platforms/52xx/mpc52xx_pci.c
View File

@ -327,14 +327,13 @@ mpc52xx_pci_setup(struct pci_controller *hose,
static void
mpc52xx_pci_fixup_resources(struct pci_dev *dev)
{
int i;
struct resource *res;
pr_debug("%s() %.4x:%.4x\n", __func__, dev->vendor, dev->device);
/* We don't rely on boot loader for PCI and resets all
devices */
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
struct resource *res = &dev->resource[i];
pci_dev_for_each_resource(dev, res) {
if (res->end > res->start) { /* Only valid resources */
res->end -= res->start;
res->start = 0;

16
arch/powerpc/platforms/pseries/pci.c
View File

@ -240,7 +240,7 @@ void __init pSeries_final_fixup(void)
*/
static void fixup_winbond_82c105(struct pci_dev* dev)
{
int i;
struct resource *r;
unsigned int reg;
if (!machine_is(pseries))
@ -251,14 +251,14 @@ static void fixup_winbond_82c105(struct pci_dev* dev)
/* Enable LEGIRQ to use INTC instead of ISA interrupts */
pci_write_config_dword(dev, 0x40, reg | (1<<11));
for (i = 0; i < DEVICE_COUNT_RESOURCE; ++i) {
pci_dev_for_each_resource(dev, r) {
/* zap the 2nd function of the winbond chip */
if (dev->resource[i].flags & IORESOURCE_IO
&& dev->bus->number == 0 && dev->devfn == 0x81)
dev->resource[i].flags &= ~IORESOURCE_IO;
if (dev->resource[i].start == 0 && dev->resource[i].end) {
dev->resource[i].flags = 0;
dev->resource[i].end = 0;
if (dev->bus->number == 0 && dev->devfn == 0x81 &&
r->flags & IORESOURCE_IO)
r->flags &= ~IORESOURCE_IO;
if (r->start == 0 && r->end) {
r->flags = 0;
r->end = 0;
}
}
}

10
arch/sh/drivers/pci/pcie-sh7786.c
View File

@ -140,12 +140,12 @@ static void sh7786_pci_fixup(struct pci_dev *dev)
* Prevent enumeration of root complex resources.
*/
if (pci_is_root_bus(dev->bus) && dev->devfn == 0) {
int i;
struct resource *r;
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
dev->resource[i].start = 0;
dev->resource[i].end = 0;
dev->resource[i].flags = 0;
pci_dev_for_each_resource(dev, r) {
r->start = 0;
r->end = 0;
r->flags = 0;
}
}
}

5
arch/sparc/kernel/leon_pci.c
View File

@ -62,15 +62,14 @@ void leon_pci_init(struct platform_device *ofdev, struct leon_pci_info *info)
int pcibios_enable_device(struct pci_dev *dev, int mask)
{
struct resource *res;
u16 cmd, oldcmd;
int i;
pci_read_config_word(dev, PCI_COMMAND, &cmd);
oldcmd = cmd;
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
struct resource *res = &dev->resource[i];
pci_dev_for_each_resource(dev, res, i) {
/* Only set up the requested stuff */
if (!(mask & (1<<i)))
continue;

10
arch/sparc/kernel/pci.c
View File

@ -663,11 +663,10 @@ static void pci_claim_bus_resources(struct pci_bus *bus)
struct pci_dev *dev;
list_for_each_entry(dev, &bus->devices, bus_list) {
struct resource *r;
int i;
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
struct resource *r = &dev->resource[i];
pci_dev_for_each_resource(dev, r, i) {
if (r->parent || !r->start || !r->flags)
continue;
@ -724,15 +723,14 @@ struct pci_bus *pci_scan_one_pbm(struct pci_pbm_info *pbm,
int pcibios_enable_device(struct pci_dev *dev, int mask)
{
struct resource *res;
u16 cmd, oldcmd;
int i;
pci_read_config_word(dev, PCI_COMMAND, &cmd);
oldcmd = cmd;
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
struct resource *res = &dev->resource[i];
pci_dev_for_each_resource(dev, res, i) {
/* Only set up the requested stuff */
if (!(mask & (1<<i)))
continue;

5
arch/sparc/kernel/pcic.c
View File

@ -643,15 +643,14 @@ void pcibios_fixup_bus(struct pci_bus *bus)
int pcibios_enable_device(struct pci_dev *dev, int mask)
{
struct resource *res;
u16 cmd, oldcmd;
int i;
pci_read_config_word(dev, PCI_COMMAND, &cmd);
oldcmd = cmd;
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
struct resource *res = &dev->resource[i];
pci_dev_for_each_resource(dev, res, i) {
/* Only set up the requested stuff */
if (!(mask & (1<<i)))
continue;

5
drivers/pci/remove.c
View File

@ -5,10 +5,9 @@
static void pci_free_resources(struct pci_dev *dev)
{
int i;
struct resource *res;
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
struct resource *res = dev->resource + i;
pci_dev_for_each_resource(dev, res) {
if (res->parent)
release_resource(res);
}

27
drivers/pci/setup-bus.c
View File

@ -124,20 +124,17 @@ static resource_size_t get_res_add_align(struct list_head *head,
return dev_res ? dev_res->min_align : 0;
}
/* Sort resources by alignment */
static void pdev_sort_resources(struct pci_dev *dev, struct list_head *head)
{
struct resource *r;
int i;
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
struct resource *r;
pci_dev_for_each_resource(dev, r, i) {
struct pci_dev_resource *dev_res, *tmp;
resource_size_t r_align;
struct list_head *n;
r = &dev->resource[i];
if (r->flags & IORESOURCE_PCI_FIXED)
continue;
@ -895,10 +892,9 @@ static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size,
min_align = window_alignment(bus, IORESOURCE_IO);
list_for_each_entry(dev, &bus->devices, bus_list) {
int i;
struct resource *r;
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
struct resource *r = &dev->resource[i];
pci_dev_for_each_resource(dev, r) {
unsigned long r_size;
if (r->parent || !(r->flags & IORESOURCE_IO))
@ -1014,10 +1010,10 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
size = 0;
list_for_each_entry(dev, &bus->devices, bus_list) {
struct resource *r;
int i;
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
struct resource *r = &dev->resource[i];
pci_dev_for_each_resource(dev, r, i) {
resource_size_t r_size;
if (r->parent || (r->flags & IORESOURCE_PCI_FIXED) ||
@ -1358,11 +1354,10 @@ static void assign_fixed_resource_on_bus(struct pci_bus *b, struct resource *r)
*/
static void pdev_assign_fixed_resources(struct pci_dev *dev)
{
int i;
struct resource *r;
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
pci_dev_for_each_resource(dev, r) {
struct pci_bus *b;
struct resource *r = &dev->resource[i];
if (r->parent || !(r->flags & IORESOURCE_PCI_FIXED) ||
!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
@ -1795,11 +1790,9 @@ static void remove_dev_resources(struct pci_dev *dev, struct resource *io,
struct resource *mmio,
struct resource *mmio_pref)
{
int i;
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
struct resource *res = &dev->resource[i];
struct resource *res;
pci_dev_for_each_resource(dev, res) {
if (resource_type(res) == IORESOURCE_IO) {
remove_dev_resource(io, dev, res);
} else if (resource_type(res) == IORESOURCE_MEM) {

4
drivers/pci/setup-res.c
View File

@ -484,12 +484,10 @@ int pci_enable_resources(struct pci_dev *dev, int mask)
pci_read_config_word(dev, PCI_COMMAND, &cmd);
old_cmd = cmd;
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
pci_dev_for_each_resource(dev, r, i) {
if (!(mask & (1 << i)))
continue;
r = &dev->resource[i];
if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
continue;
if ((i == PCI_ROM_RESOURCE) &&

17
drivers/pci/vgaarb.c
View File

@ -548,10 +548,8 @@ static bool vga_is_firmware_default(struct pci_dev *pdev)
#if defined(CONFIG_X86) || defined(CONFIG_IA64)
u64 base = screen_info.lfb_base;
u64 size = screen_info.lfb_size;
struct resource *r;
u64 limit;
resource_size_t start, end;
unsigned long flags;
int i;
/* Select the device owning the boot framebuffer if there is one */
@ -561,19 +559,14 @@ static bool vga_is_firmware_default(struct pci_dev *pdev)
limit = base + size;
/* Does firmware framebuffer belong to us? */
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
flags = pci_resource_flags(pdev, i);
if ((flags & IORESOURCE_MEM) == 0)
pci_dev_for_each_resource(pdev, r) {
if (resource_type(r) != IORESOURCE_MEM)
continue;
start = pci_resource_start(pdev, i);
end = pci_resource_end(pdev, i);
if (!start || !end)
if (!r->start || !r->end)
continue;
if (base < start || limit >= end)
if (base < r->start || limit >= r->end)
continue;
return true;

4
drivers/pci/xen-pcifront.c
View File

@ -390,9 +390,7 @@ static int pcifront_claim_resource(struct pci_dev *dev, void *data)
int i;
struct resource *r;
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
r = &dev->resource[i];
pci_dev_for_each_resource(dev, r, i) {
if (!r->parent && r->start && r->flags) {
dev_info(&pdev->xdev->dev, "claiming resource %s/%d\n",
pci_name(dev), i);

29
drivers/pnp/quirks.c
View File

@ -229,8 +229,7 @@ static void quirk_ad1815_mpu_resources(struct pnp_dev *dev)
static void quirk_system_pci_resources(struct pnp_dev *dev)
{
struct pci_dev *pdev = NULL;
struct resource *res;
resource_size_t pnp_start, pnp_end, pci_start, pci_end;
struct resource *res, *r;
int i, j;
/*
@ -243,32 +242,26 @@ static void quirk_system_pci_resources(struct pnp_dev *dev)
* so they won't be claimed by the PNP system driver.
*/
for_each_pci_dev(pdev) {
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
unsigned long flags, type;
pci_dev_for_each_resource(pdev, r, i) {
unsigned long type = resource_type(r);
flags = pci_resource_flags(pdev, i);
type = flags & (IORESOURCE_IO | IORESOURCE_MEM);
if (!type || pci_resource_len(pdev, i) == 0)
if (!(type == IORESOURCE_IO || type == IORESOURCE_MEM) ||
resource_size(r) == 0)
continue;
if (flags & IORESOURCE_UNSET)
if (r->flags & IORESOURCE_UNSET)
continue;
pci_start = pci_resource_start(pdev, i);
pci_end = pci_resource_end(pdev, i);
for (j = 0;
(res = pnp_get_resource(dev, type, j)); j++) {
if (res->start == 0 && res->end == 0)
continue;
pnp_start = res->start;
pnp_end = res->end;
/*
* If the PNP region doesn't overlap the PCI
* region at all, there's no problem.
*/
if (pnp_end < pci_start || pnp_start > pci_end)
if (!resource_overlaps(res, r))
continue;
/*
@ -278,8 +271,7 @@ static void quirk_system_pci_resources(struct pnp_dev *dev)
* PNP device describes a bridge with PCI
* behind it.
*/
if (pnp_start <= pci_start &&
pnp_end >= pci_end)
if (res->start <= r->start && res->end >= r->end)
continue;
/*
@ -288,9 +280,8 @@ static void quirk_system_pci_resources(struct pnp_dev *dev)
* driver from requesting its resources.
*/
dev_warn(&dev->dev,
"disabling %pR because it overlaps "
"%s BAR %d %pR\n", res,
pci_name(pdev), i, &pdev->resource[i]);
"disabling %pR because it overlaps %s BAR %d %pR\n",
res, pci_name(pdev), i, r);
res->flags |= IORESOURCE_DISABLED;
}
}

14
include/linux/pci.h
View File

@ -2002,6 +2002,20 @@ int pci_iobar_pfn(struct pci_dev *pdev, int bar, struct vm_area_struct *vma);
(pci_resource_end((dev), (bar)) ? \
resource_size(pci_resource_n((dev), (bar))) : 0)
#define __pci_dev_for_each_res0(dev, res, ...) \
for (unsigned int __b = 0; \
res = pci_resource_n(dev, __b), __b < PCI_NUM_RESOURCES; \
__b++)
#define __pci_dev_for_each_res1(dev, res, __b) \
for (__b = 0; \
res = pci_resource_n(dev, __b), __b < PCI_NUM_RESOURCES; \
__b++)
#define pci_dev_for_each_resource(dev, res, ...) \
CONCATENATE(__pci_dev_for_each_res, COUNT_ARGS(__VA_ARGS__)) \
(dev, res, __VA_ARGS__)
/*
* Similar to the helpers above, these manipulate per-pci_dev
* driver-specific data. They are really just a wrapper around