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authorIlpo Järvinen <ilpo.jarvinen@linux.intel.com>2024-02-22 14:46:06 +0300
committerBjorn Helgaas <bhelgaas@google.com>2024-03-06 01:10:17 +0300
commitf6c73999837820f98519bf0146df44e58f20f89c (patch)
tree1df8728e690737ada86f304b075beb30fd5646cd /drivers/pci
parent2ea548a3c01de873b54390dc07ef0a72d9b4a5f3 (diff)
downloadlinux-f6c73999837820f98519bf0146df44e58f20f89c.tar.xz
PCI/sysfs: Demacrofy pci_dev_resource_resize_attr(n) functions
pci_dev_resource_resize_attr(n) macro is invoked for six resources, creating a large footprint function for each resource. Rework the macro to only create a function that calls a helper function so the compiler can decide if it warrants to inline the function or not. With x86_64 defconfig, this saves roughly 2.5kB: $ scripts/bloat-o-meter drivers/pci/pci-sysfs.o{.old,.new} add/remove: 1/0 grow/shrink: 0/6 up/down: 512/-2934 (-2422) Function old new delta __resource_resize_store - 512 +512 resource5_resize_store 503 14 -489 resource4_resize_store 503 14 -489 resource3_resize_store 503 14 -489 resource2_resize_store 503 14 -489 resource1_resize_store 503 14 -489 resource0_resize_store 500 11 -489 Total: Before=13399, After=10977, chg -18.08% (The compiler seemingly chose to still inline __resource_resize_show() which is fine, those functions are not very complex/large.) Link: https://lore.kernel.org/r/20240222114607.1837-1-ilpo.jarvinen@linux.intel.com Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/pci-sysfs.c138
1 files changed, 74 insertions, 64 deletions
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 44ed30df08c3..40cfa716392f 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -1387,79 +1387,89 @@ static const struct attribute_group pci_dev_reset_attr_group = {
.is_visible = pci_dev_reset_attr_is_visible,
};
+static ssize_t __resource_resize_show(struct device *dev, int n, char *buf)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ ssize_t ret;
+
+ pci_config_pm_runtime_get(pdev);
+
+ ret = sysfs_emit(buf, "%016llx\n",
+ (u64)pci_rebar_get_possible_sizes(pdev, n));
+
+ pci_config_pm_runtime_put(pdev);
+
+ return ret;
+}
+
+static ssize_t __resource_resize_store(struct device *dev, int n,
+ const char *buf, size_t count)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ unsigned long size, flags;
+ int ret, i;
+ u16 cmd;
+
+ if (kstrtoul(buf, 0, &size) < 0)
+ return -EINVAL;
+
+ device_lock(dev);
+ if (dev->driver) {
+ ret = -EBUSY;
+ goto unlock;
+ }
+
+ pci_config_pm_runtime_get(pdev);
+
+ if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA) {
+ ret = aperture_remove_conflicting_pci_devices(pdev,
+ "resourceN_resize");
+ if (ret)
+ goto pm_put;
+ }
+
+ pci_read_config_word(pdev, PCI_COMMAND, &cmd);
+ pci_write_config_word(pdev, PCI_COMMAND,
+ cmd & ~PCI_COMMAND_MEMORY);
+
+ flags = pci_resource_flags(pdev, n);
+
+ pci_remove_resource_files(pdev);
+
+ for (i = 0; i < PCI_STD_NUM_BARS; i++) {
+ if (pci_resource_len(pdev, i) &&
+ pci_resource_flags(pdev, i) == flags)
+ pci_release_resource(pdev, i);
+ }
+
+ ret = pci_resize_resource(pdev, n, size);
+
+ pci_assign_unassigned_bus_resources(pdev->bus);
+
+ if (pci_create_resource_files(pdev))
+ pci_warn(pdev, "Failed to recreate resource files after BAR resizing\n");
+
+ pci_write_config_word(pdev, PCI_COMMAND, cmd);
+pm_put:
+ pci_config_pm_runtime_put(pdev);
+unlock:
+ device_unlock(dev);
+
+ return ret ? ret : count;
+}
+
#define pci_dev_resource_resize_attr(n) \
static ssize_t resource##n##_resize_show(struct device *dev, \
struct device_attribute *attr, \
- char * buf) \
+ char *buf) \
{ \
- struct pci_dev *pdev = to_pci_dev(dev); \
- ssize_t ret; \
- \
- pci_config_pm_runtime_get(pdev); \
- \
- ret = sysfs_emit(buf, "%016llx\n", \
- (u64)pci_rebar_get_possible_sizes(pdev, n)); \
- \
- pci_config_pm_runtime_put(pdev); \
- \
- return ret; \
+ return __resource_resize_show(dev, n, buf); \
} \
- \
static ssize_t resource##n##_resize_store(struct device *dev, \
struct device_attribute *attr,\
const char *buf, size_t count)\
{ \
- struct pci_dev *pdev = to_pci_dev(dev); \
- unsigned long size, flags; \
- int ret, i; \
- u16 cmd; \
- \
- if (kstrtoul(buf, 0, &size) < 0) \
- return -EINVAL; \
- \
- device_lock(dev); \
- if (dev->driver) { \
- ret = -EBUSY; \
- goto unlock; \
- } \
- \
- pci_config_pm_runtime_get(pdev); \
- \
- if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA) { \
- ret = aperture_remove_conflicting_pci_devices(pdev, \
- "resourceN_resize"); \
- if (ret) \
- goto pm_put; \
- } \
- \
- pci_read_config_word(pdev, PCI_COMMAND, &cmd); \
- pci_write_config_word(pdev, PCI_COMMAND, \
- cmd & ~PCI_COMMAND_MEMORY); \
- \
- flags = pci_resource_flags(pdev, n); \
- \
- pci_remove_resource_files(pdev); \
- \
- for (i = 0; i < PCI_STD_NUM_BARS; i++) { \
- if (pci_resource_len(pdev, i) && \
- pci_resource_flags(pdev, i) == flags) \
- pci_release_resource(pdev, i); \
- } \
- \
- ret = pci_resize_resource(pdev, n, size); \
- \
- pci_assign_unassigned_bus_resources(pdev->bus); \
- \
- if (pci_create_resource_files(pdev)) \
- pci_warn(pdev, "Failed to recreate resource files after BAR resizing\n");\
- \
- pci_write_config_word(pdev, PCI_COMMAND, cmd); \
-pm_put: \
- pci_config_pm_runtime_put(pdev); \
-unlock: \
- device_unlock(dev); \
- \
- return ret ? ret : count; \
+ return __resource_resize_store(dev, n, buf, count); \
} \
static DEVICE_ATTR_RW(resource##n##_resize)