[PATCH v2 1/4] PCI: Introduce pci_dev_for_each_resource()

Andy Shevchenko
2022-11-03T16:48:10Z

From: Mika Westerberg <mika.westerberg@linux.intel.com>

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>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
.clang-format | 2 ++
arch/alpha/kernel/pci.c | 5 ++---
arch/arm/kernel/bios32.c | 16 +++++++---------
arch/mips/pci/pci-legacy.c | 3 +--
arch/powerpc/kernel/pci-common.c | 5 ++---
arch/sparc/kernel/leon_pci.c | 5 ++---
arch/sparc/kernel/pci.c | 10 ++++------
arch/sparc/kernel/pcic.c | 5 ++---
drivers/pci/remove.c | 5 ++---
drivers/pci/setup-bus.c | 26 ++++++++++----------------
drivers/pci/setup-res.c | 4 +---
drivers/pci/xen-pcifront.c | 4 +---
include/linux/pci.h | 11 +++++++++++
13 files changed, 47 insertions(+), 54 deletions(-)

diff --git a/.clang-format b/.clang-format
index f98481a53ea8..08d579fea6cf 100644
--- a/.clang-format
+++ b/.clang-format
@@ -520,6 +520,8 @@ ForEachMacros:
- 'of_property_for_each_string'
- 'of_property_for_each_u32'
- 'pci_bus_for_each_resource'
+ - 'pci_dev_for_each_resource'
+ - 'pci_dev_for_each_resource_p'
- 'pci_doe_for_each_off'
- 'pcl_for_each_chunk'
- 'pcl_for_each_segment'
diff --git a/arch/alpha/kernel/pci.c b/arch/alpha/kernel/pci.c
index 64fbfb0763b2..4458eb7f44f0 100644
--- a/arch/alpha/kernel/pci.c
+++ b/arch/alpha/kernel/pci.c
@@ -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) ||
diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c
index e7ef2b5bea9c..5254734b23e6 100644
--- a/arch/arm/kernel/bios32.c
+++ b/arch/arm/kernel/bios32.c
@@ -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_p(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_p(dev, r) {
if ((r->start & ~0x80) == 0x374) {
r->start |= 2;
r->end = r->start;
diff --git a/arch/mips/pci/pci-legacy.c b/arch/mips/pci/pci-legacy.c
index 468722c8a5c6..ec2567f8efd8 100644
--- a/arch/mips/pci/pci-legacy.c
+++ b/arch/mips/pci/pci-legacy.c
@@ -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) &&
diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
index d67cf79bf5d0..8ddcfa6bcb50 100644
--- a/arch/powerpc/kernel/pci-common.c
+++ b/arch/powerpc/kernel/pci-common.c
@@ -1452,11 +1452,10 @@ 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;

diff --git a/arch/sparc/kernel/leon_pci.c b/arch/sparc/kernel/leon_pci.c
index e5e5ff6b9a5c..b6663a3fbae9 100644
--- a/arch/sparc/kernel/leon_pci.c
+++ b/arch/sparc/kernel/leon_pci.c
@@ -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;
diff --git a/arch/sparc/kernel/pci.c b/arch/sparc/kernel/pci.c
index cb1ef25116e9..a948a49817c7 100644
--- a/arch/sparc/kernel/pci.c
+++ b/arch/sparc/kernel/pci.c
@@ -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;
diff --git a/arch/sparc/kernel/pcic.c b/arch/sparc/kernel/pcic.c
index ee4c9a9a171c..25fe0a061732 100644
--- a/arch/sparc/kernel/pcic.c
+++ b/arch/sparc/kernel/pcic.c
@@ -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;
diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c
index 4c54c75050dc..825ae3cffead 100644
--- a/drivers/pci/remove.c
+++ b/drivers/pci/remove.c
@@ -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_p(dev, res) {
if (res->parent)
release_resource(res);
}
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index e512f9ecb9d0..336d6e6ef76a 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -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_p(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_p(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)))
@@ -1845,7 +1840,7 @@ static void pci_bus_distribute_available_resources(struct pci_bus *bus,
* distributing the rest.
*/
list_for_each_entry(dev, &bus->devices, bus_list) {
- int i;
+ struct resource *dev_res;

if (dev == bridge)
continue;
@@ -1857,8 +1852,7 @@ static void pci_bus_distribute_available_resources(struct pci_bus *bus,
if (!dev->multifunction)
return;

- for (i = 0; i < PCI_NUM_RESOURCES; i++) {
- const struct resource *dev_res = &dev->resource[i];
+ pci_dev_for_each_resource_p(dev, dev_res) {
resource_size_t dev_sz;
struct resource *b_res;

diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index b492e67c3d87..967f9a758923 100644
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -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) &&
diff --git a/drivers/pci/xen-pcifront.c b/drivers/pci/xen-pcifront.c
index 7378e2f3e525..ce485ef59656 100644
--- a/drivers/pci/xen-pcifront.c
+++ b/drivers/pci/xen-pcifront.c
@@ -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);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 2bda4a4e47e8..3940435fa90a 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1407,6 +1407,17 @@ int pci_request_selected_regions(struct pci_dev *, int, const char *);
int pci_request_selected_regions_exclusive(struct pci_dev *, int, const char *);
void pci_release_selected_regions(struct pci_dev *, int);

+#define __pci_dev_for_each_resource(dev, res, __i, vartype) \
+ for (vartype __i = 0; \
+ res = &(dev)->resource[__i], __i < PCI_NUM_RESOURCES; \
+ __i++)
+
+#define pci_dev_for_each_resource(dev, res, i) \
+ __pci_dev_for_each_resource(dev, res, i, )
+
+#define pci_dev_for_each_resource_p(dev, res) \
+ __pci_dev_for_each_resource(dev, res, i, unsigned int)
+
/* drivers/pci/bus.c */
void pci_add_resource(struct list_head *resources, struct resource *res);
void pci_add_resource_offset(struct list_head *resources, struct resource *res,
--
2.35.1