PCI/ASPM: Add sysfs attributes for controlling ASPM link states
Add sysfs attributes to Endpoints and other Upstream Ports to control ASPM, Clock PM, and L1 PM Substates. The new attributes are: /sys/devices/pci*/.../link/clkpm /sys/devices/pci*/.../link/l0s_aspm /sys/devices/pci*/.../link/l1_aspm /sys/devices/pci*/.../link/l1_1_aspm /sys/devices/pci*/.../link/l1_2_aspm /sys/devices/pci*/.../link/l1_1_pcipm /sys/devices/pci*/.../link/l1_2_pcipm An attribute is only visible if both ends of the Link leading to the device support the state. Writing y/1/on to the file enables the state; n/0/off disables it. These attributes can be used to tune the power/performance tradeoff for individual devices. [bhelgaas: commit log, rename directory to "link"] Link: https://lore.kernel.org/r/b1c83f8a-9bf6-eac5-82d0-cf5b90128fbf@gmail.com Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Heiner Kallweit
Bjorn Helgaas
Родитель
687aaf386a
Коммит
72ea91afbf
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@ -347,3 +347,16 @@ Description:
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If the device has any Peer-to-Peer memory registered, this
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file contains a '1' if the memory has been published for
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use outside the driver that owns the device.
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What: /sys/bus/pci/devices/.../link/clkpm
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/sys/bus/pci/devices/.../link/l0s_aspm
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/sys/bus/pci/devices/.../link/l1_aspm
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/sys/bus/pci/devices/.../link/l1_1_aspm
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/sys/bus/pci/devices/.../link/l1_2_aspm
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/sys/bus/pci/devices/.../link/l1_1_pcipm
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/sys/bus/pci/devices/.../link/l1_2_pcipm
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Date: October 2019
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Contact: Heiner Kallweit <hkallweit1@gmail.com>
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Description: If ASPM is supported for an endpoint, these files can be
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used to disable or enable the individual power management
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states. Write y/1/on to enable, n/0/off to disable.
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@ -1587,6 +1587,9 @@ static const struct attribute_group *pci_dev_attr_groups[] = {
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&pcie_dev_attr_group,
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#ifdef CONFIG_PCIEAER
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&aer_stats_attr_group,
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#endif
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#ifdef CONFIG_PCIEASPM
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&aspm_ctrl_attr_group,
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#endif
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NULL,
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};
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@ -667,4 +667,8 @@ static inline int pci_acpi_program_hp_params(struct pci_dev *dev)
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}
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#endif
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#ifdef CONFIG_PCIEASPM
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extern const struct attribute_group aspm_ctrl_attr_group;
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#endif
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#endif /* DRIVERS_PCI_H */
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@ -899,6 +899,14 @@ static struct pcie_link_state *alloc_pcie_link_state(struct pci_dev *pdev)
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return link;
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}
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static void pcie_aspm_update_sysfs_visibility(struct pci_dev *pdev)
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{
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struct pci_dev *child;
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list_for_each_entry(child, &pdev->subordinate->devices, bus_list)
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sysfs_update_group(&child->dev.kobj, &aspm_ctrl_attr_group);
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}
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/*
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* pcie_aspm_init_link_state: Initiate PCI express link state.
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* It is called after the pcie and its children devices are scanned.
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@ -960,6 +968,8 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev)
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pcie_set_clkpm(link, policy_to_clkpm_state(link));
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}
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pcie_aspm_update_sysfs_visibility(pdev);
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unlock:
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mutex_unlock(&aspm_lock);
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out:
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@ -1313,6 +1323,145 @@ void pcie_aspm_remove_sysfs_dev_files(struct pci_dev *pdev)
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}
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#endif
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static ssize_t aspm_attr_show_common(struct device *dev,
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struct device_attribute *attr,
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char *buf, u8 state)
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{
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struct pci_dev *pdev = to_pci_dev(dev);
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struct pcie_link_state *link = pcie_aspm_get_link(pdev);
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return sprintf(buf, "%d\n", (link->aspm_enabled & state) ? 1 : 0);
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}
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static ssize_t aspm_attr_store_common(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len, u8 state)
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{
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struct pci_dev *pdev = to_pci_dev(dev);
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struct pcie_link_state *link = pcie_aspm_get_link(pdev);
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bool state_enable;
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if (strtobool(buf, &state_enable) < 0)
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return -EINVAL;
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down_read(&pci_bus_sem);
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mutex_lock(&aspm_lock);
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if (state_enable) {
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link->aspm_disable &= ~state;
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/* need to enable L1 for substates */
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if (state & ASPM_STATE_L1SS)
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link->aspm_disable &= ~ASPM_STATE_L1;
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} else {
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link->aspm_disable |= state;
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}
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pcie_config_aspm_link(link, policy_to_aspm_state(link));
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mutex_unlock(&aspm_lock);
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up_read(&pci_bus_sem);
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return len;
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}
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#define ASPM_ATTR(_f, _s) \
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static ssize_t _f##_show(struct device *dev, \
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struct device_attribute *attr, char *buf) \
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{ return aspm_attr_show_common(dev, attr, buf, ASPM_STATE_##_s); } \
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\
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static ssize_t _f##_store(struct device *dev, \
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struct device_attribute *attr, \
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const char *buf, size_t len) \
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{ return aspm_attr_store_common(dev, attr, buf, len, ASPM_STATE_##_s); }
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ASPM_ATTR(l0s_aspm, L0S)
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ASPM_ATTR(l1_aspm, L1)
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ASPM_ATTR(l1_1_aspm, L1_1)
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ASPM_ATTR(l1_2_aspm, L1_2)
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ASPM_ATTR(l1_1_pcipm, L1_1_PCIPM)
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ASPM_ATTR(l1_2_pcipm, L1_2_PCIPM)
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static ssize_t clkpm_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct pci_dev *pdev = to_pci_dev(dev);
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struct pcie_link_state *link = pcie_aspm_get_link(pdev);
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return sprintf(buf, "%d\n", link->clkpm_enabled);
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}
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static ssize_t clkpm_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len)
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{
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struct pci_dev *pdev = to_pci_dev(dev);
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struct pcie_link_state *link = pcie_aspm_get_link(pdev);
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bool state_enable;
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if (strtobool(buf, &state_enable) < 0)
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return -EINVAL;
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down_read(&pci_bus_sem);
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mutex_lock(&aspm_lock);
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link->clkpm_disable = !state_enable;
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pcie_set_clkpm(link, policy_to_clkpm_state(link));
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mutex_unlock(&aspm_lock);
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up_read(&pci_bus_sem);
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return len;
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}
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static DEVICE_ATTR_RW(clkpm);
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static DEVICE_ATTR_RW(l0s_aspm);
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static DEVICE_ATTR_RW(l1_aspm);
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static DEVICE_ATTR_RW(l1_1_aspm);
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static DEVICE_ATTR_RW(l1_2_aspm);
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static DEVICE_ATTR_RW(l1_1_pcipm);
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static DEVICE_ATTR_RW(l1_2_pcipm);
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static struct attribute *aspm_ctrl_attrs[] = {
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&dev_attr_clkpm.attr,
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&dev_attr_l0s_aspm.attr,
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&dev_attr_l1_aspm.attr,
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&dev_attr_l1_1_aspm.attr,
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&dev_attr_l1_2_aspm.attr,
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&dev_attr_l1_1_pcipm.attr,
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&dev_attr_l1_2_pcipm.attr,
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NULL
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};
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static umode_t aspm_ctrl_attrs_are_visible(struct kobject *kobj,
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struct attribute *a, int n)
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{
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struct device *dev = kobj_to_dev(kobj);
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struct pci_dev *pdev = to_pci_dev(dev);
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struct pcie_link_state *link = pcie_aspm_get_link(pdev);
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static const u8 aspm_state_map[] = {
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ASPM_STATE_L0S,
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ASPM_STATE_L1,
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ASPM_STATE_L1_1,
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ASPM_STATE_L1_2,
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ASPM_STATE_L1_1_PCIPM,
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ASPM_STATE_L1_2_PCIPM,
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};
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if (aspm_disabled || !link)
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return 0;
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if (n == 0)
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return link->clkpm_capable ? a->mode : 0;
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return link->aspm_capable & aspm_state_map[n - 1] ? a->mode : 0;
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}
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const struct attribute_group aspm_ctrl_attr_group = {
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.name = "link",
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.attrs = aspm_ctrl_attrs,
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.is_visible = aspm_ctrl_attrs_are_visible,
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};
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static int __init pcie_aspm_disable(char *str)
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{
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if (!strcmp(str, "off")) {
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