linux-kernel - [PATCH v2] pci/aspm: Remove CONFIG_PCIEASPM

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Date:   Thu, 10 May 2018 16:39:12 -0700
From:   Rajat Jain <rajatja@...gle.com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Rajat Jain <rajatja@...gle.com>,
        Keith Busch <keith.busch@...el.com>,
        Vidya Sagar <vidyas@...dia.com>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Kees Cook <keescook@...omium.org>,
        "Gustavo A. R. Silva" <garsilva@...eddedor.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Sinan Kaya <okaya@...eaurora.org>,
        Frederick Lawler <fred@...dlawl.com>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        mayurkumar.patel@...el.com
Cc:     rajatxjain@...il.com
Subject: [PATCH v2] pci/aspm: Remove CONFIG_PCIEASPM_DEBUG

Currently, the linux kernel disables ASPM when a device is
removed from the kernel. But it is not enabled again when
a new device is added on that slot even if it was originally
enabled (by the BIOS) when the system booted up (assuming
POLICY_DEFAULT).

This was earlier discussed here:
https://www.spinics.net/lists/linux-pci/msg60212.html

And some suggestions from Bjorn here:
https://www.spinics.net/lists/linux-pci/msg60541.html

This patch picks up one of the suggestion, to remove the
CONFIG_PCIEASPM_DEBUG and thus make the code always
avilable. This provides control to userspace to control
ASPM on a per slot / device basis using sysfs interface.

Signed-off-by: Rajat Jain <rajatja@...gle.com>
---
v2: provide function definitions for !CONFIG_PCIEASPM case

 drivers/pci/pci.h        | 8 ++------
 drivers/pci/pcie/Kconfig | 8 --------
 drivers/pci/pcie/aspm.c  | 2 --
 3 files changed, 2 insertions(+), 16 deletions(-)

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 023f7cf25bff..b953b2349ca1 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -358,17 +358,13 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev);
 void pcie_aspm_exit_link_state(struct pci_dev *pdev);
 void pcie_aspm_pm_state_change(struct pci_dev *pdev);
 void pcie_aspm_powersave_config_link(struct pci_dev *pdev);
+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_init_link_state(struct pci_dev *pdev) { }
 static inline void pcie_aspm_exit_link_state(struct pci_dev *pdev) { }
 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
diff --git a/drivers/pci/pcie/Kconfig b/drivers/pci/pcie/Kconfig
index b12e28b3d8f9..089b9f559d88 100644
--- a/drivers/pci/pcie/Kconfig
+++ b/drivers/pci/pcie/Kconfig
@@ -46,14 +46,6 @@ config PCIEASPM
 
 	  When in doubt, say Y.
 
-config PCIEASPM_DEBUG
-	bool "Debug PCI Express ASPM"
-	depends on PCIEASPM
-	default n
-	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 c687c817b47d..8ffc13d42baa 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -1161,7 +1161,6 @@ static int pcie_aspm_get_policy(char *buffer, const struct kernel_param *kp)
 module_param_call(policy, pcie_aspm_set_policy, pcie_aspm_get_policy,
 	NULL, 0644);
 
-#ifdef CONFIG_PCIEASPM_DEBUG
 static ssize_t link_state_show(struct device *dev,
 		struct device_attribute *attr,
 		char *buf)
@@ -1264,7 +1263,6 @@ void pcie_aspm_remove_sysfs_dev_files(struct pci_dev *pdev)
 		sysfs_remove_file_from_group(&pdev->dev.kobj,
 			&dev_attr_clk_ctl.attr, power_group);
 }
-#endif
 
 static int __init pcie_aspm_disable(char *str)
 {
-- 
2.17.0.441.gb46fe60e1d-goog