[PATCH 6/7][SRU][Focal] PCI/ASPM: Remove PCIEASPM_DEBUG Kconfig option and related code
AceLan Kao
acelan.kao at canonical.com
Tue Mar 10 01:48:35 UTC 2020
From: Heiner Kallweit <hkallweit1 at gmail.com>
BguLink: https://bugs.launchpad.net/bugs/1836030
Previously, CONFIG_PCIEASPM_DEBUG enabled "link_state" and "clk_ctl" sysfs
files that controlled ASPM. We believe these files were rarely if ever
used.
We recently added sysfs ASPM controls that are always present, so the debug
code is no longer needed. Removing this debug code has been discussed for
quite some time, see e.g. [0].
Remove PCIEASPM_DEBUG and the related code.
[0] https://lore.kernel.org/lkml/20180727202619.GD173328@bhelgaas-glaptop.roam.corp.google.com/
Link: https://lore.kernel.org/r/ec935d8e-c084-3938-f1d1-748617596b25@gmail.com
Signed-off-by: Heiner Kallweit <hkallweit1 at gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas at google.com>
(cherry picked from commit 87e90283c94c76ee11d379ab5a0973382bbd0baf)
Signed-off-by: AceLan Kao <acelan.kao at canonical.com>
---
drivers/pci/pci-sysfs.c | 3 --
drivers/pci/pci.h | 8 ---
drivers/pci/pcie/Kconfig | 7 ---
drivers/pci/pcie/aspm.c | 105 ---------------------------------------
4 files changed, 123 deletions(-)
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 0e76c02e0b7d..92bf1b1ce280 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -1330,7 +1330,6 @@ static int pci_create_capabilities_sysfs(struct pci_dev *dev)
int retval;
pcie_vpd_create_sysfs_dev_files(dev);
- pcie_aspm_create_sysfs_dev_files(dev);
if (dev->reset_fn) {
retval = device_create_file(&dev->dev, &dev_attr_reset);
@@ -1340,7 +1339,6 @@ static int pci_create_capabilities_sysfs(struct pci_dev *dev)
return 0;
error:
- pcie_aspm_remove_sysfs_dev_files(dev);
pcie_vpd_remove_sysfs_dev_files(dev);
return retval;
}
@@ -1416,7 +1414,6 @@ int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
{
pcie_vpd_remove_sysfs_dev_files(dev);
- pcie_aspm_remove_sysfs_dev_files(dev);
if (dev->reset_fn) {
device_remove_file(&dev->dev, &dev_attr_reset);
dev->reset_fn = 0;
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 317a796a723e..09d54503f366 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -545,14 +545,6 @@ static inline void pcie_aspm_pm_state_change(struct pci_dev *pdev) { }
static inline void pcie_aspm_powersave_config_link(struct pci_dev *pdev) { }
#endif
-#ifdef CONFIG_PCIEASPM_DEBUG
-void pcie_aspm_create_sysfs_dev_files(struct pci_dev *pdev);
-void pcie_aspm_remove_sysfs_dev_files(struct pci_dev *pdev);
-#else
-static inline void pcie_aspm_create_sysfs_dev_files(struct pci_dev *pdev) { }
-static inline void pcie_aspm_remove_sysfs_dev_files(struct pci_dev *pdev) { }
-#endif
-
#ifdef CONFIG_PCIE_ECRC
void pcie_set_ecrc_checking(struct pci_dev *dev);
void pcie_ecrc_get_policy(char *str);
diff --git a/drivers/pci/pcie/Kconfig b/drivers/pci/pcie/Kconfig
index 362eb8cfa53b..a2e862d4ec21 100644
--- a/drivers/pci/pcie/Kconfig
+++ b/drivers/pci/pcie/Kconfig
@@ -79,13 +79,6 @@ config PCIEASPM
When in doubt, say Y.
-config PCIEASPM_DEBUG
- bool "Debug PCI Express ASPM"
- depends on PCIEASPM
- help
- This enables PCI Express ASPM debug support. It will add per-device
- interface to control ASPM.
-
choice
prompt "Default ASPM policy"
default PCIEASPM_DEFAULT
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index 9cd251827a67..0dcd44308228 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -1218,111 +1218,6 @@ bool pcie_aspm_enabled(struct pci_dev *pdev)
}
EXPORT_SYMBOL_GPL(pcie_aspm_enabled);
-#ifdef CONFIG_PCIEASPM_DEBUG
-static ssize_t link_state_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct pci_dev *pci_device = to_pci_dev(dev);
- struct pcie_link_state *link_state = pci_device->link_state;
-
- return sprintf(buf, "%d\n", link_state->aspm_enabled);
-}
-
-static ssize_t link_state_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t n)
-{
- struct pci_dev *pdev = to_pci_dev(dev);
- struct pcie_link_state *link, *root = pdev->link_state->root;
- u32 state;
-
- if (aspm_disabled)
- return -EPERM;
-
- if (kstrtouint(buf, 10, &state))
- return -EINVAL;
- if ((state & ~ASPM_STATE_ALL) != 0)
- return -EINVAL;
-
- down_read(&pci_bus_sem);
- mutex_lock(&aspm_lock);
- list_for_each_entry(link, &link_list, sibling) {
- if (link->root != root)
- continue;
- pcie_config_aspm_link(link, state);
- }
- mutex_unlock(&aspm_lock);
- up_read(&pci_bus_sem);
- return n;
-}
-
-static ssize_t clk_ctl_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct pci_dev *pci_device = to_pci_dev(dev);
- struct pcie_link_state *link_state = pci_device->link_state;
-
- return sprintf(buf, "%d\n", link_state->clkpm_enabled);
-}
-
-static ssize_t clk_ctl_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t n)
-{
- struct pci_dev *pdev = to_pci_dev(dev);
- bool state;
-
- if (strtobool(buf, &state))
- return -EINVAL;
-
- down_read(&pci_bus_sem);
- mutex_lock(&aspm_lock);
- pcie_set_clkpm_nocheck(pdev->link_state, state);
- mutex_unlock(&aspm_lock);
- up_read(&pci_bus_sem);
-
- return n;
-}
-
-static DEVICE_ATTR_RW(link_state);
-static DEVICE_ATTR_RW(clk_ctl);
-
-static char power_group[] = "power";
-void pcie_aspm_create_sysfs_dev_files(struct pci_dev *pdev)
-{
- struct pcie_link_state *link_state = pdev->link_state;
-
- if (!link_state)
- return;
-
- if (link_state->aspm_support)
- sysfs_add_file_to_group(&pdev->dev.kobj,
- &dev_attr_link_state.attr, power_group);
- if (link_state->clkpm_capable)
- sysfs_add_file_to_group(&pdev->dev.kobj,
- &dev_attr_clk_ctl.attr, power_group);
-}
-
-void pcie_aspm_remove_sysfs_dev_files(struct pci_dev *pdev)
-{
- struct pcie_link_state *link_state = pdev->link_state;
-
- if (!link_state)
- return;
-
- if (link_state->aspm_support)
- sysfs_remove_file_from_group(&pdev->dev.kobj,
- &dev_attr_link_state.attr, power_group);
- if (link_state->clkpm_capable)
- sysfs_remove_file_from_group(&pdev->dev.kobj,
- &dev_attr_clk_ctl.attr, power_group);
-}
-#endif
-
static ssize_t aspm_attr_show_common(struct device *dev,
struct device_attribute *attr,
char *buf, u8 state)
--
2.17.1
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