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Date: Mon, 28 Feb 2022 20:19:41 -0800
From: "David E. Box" <david.e.box@...ux.intel.com>
To: nirmal.patel@...ux.intel.com, jonathan.derrick@...ux.dev,
lorenzo.pieralisi@....com, hch@...radead.org, kw@...ux.com,
robh@...nel.org, bhelgaas@...gle.com, david.e.box@...ux.intel.com,
michael.a.bottini@...ux.intel.com, rafael@...nel.org,
me@...ityamohan.in
Cc: linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH V6 1/3] PCI/ASPM: Add pci_enable_default_link_state()
From: Michael Bottini <michael.a.bottini@...ux.intel.com>
Add pci_enable_default_link_state() to allow devices to change the default
BIOS configured states. Clears the BIOS default settings then sets the new
states and reconfigures the link under the semaphore. Also add
PCIE_LINK_STATE_ALL macro for convenience for callers that want to enable
all link states.
Signed-off-by: Michael Bottini <michael.a.bottini@...ux.intel.com>
Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
---
V6
- No change
V5
- Rename to pci_enable_default_link_state and model after
pci_disable_link_state() as suggested by Bjorn.
- Add helper PCIE_LINK_STATE_ALL which sets bits for all links states and
clock pm.
- Clarify commit language to indicate the function changes the default
link states (not ASPM policy).
V4
- Refactor vmd_enable_apsm() to exit early, making the lines shorter
and more readable. Suggested by Christoph.
V3
- No changes
V2
- Use return status to print pci_info message if ASPM cannot be enabled.
- Add missing static declaration, caught by lkp@...el.com
drivers/pci/pcie/aspm.c | 54 +++++++++++++++++++++++++++++++++++++++++
include/linux/pci.h | 7 ++++++
2 files changed, 61 insertions(+)
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index a96b7424c9bc..b2752851b1ba 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -1132,6 +1132,60 @@ int pci_disable_link_state(struct pci_dev *pdev, int state)
}
EXPORT_SYMBOL(pci_disable_link_state);
+/**
+ * pci_enable_default_link_state - Clears and sets the default device link state
+ * so that the link may be allowed to enter the specified states. Note that
+ * if the BIOS didn't grant ASPM control to the OS, this does nothing because
+ * we can't touch the LNKCTL register. Also note that this does not enable
+ * states disabled by pci_disable_link_state(). Returns 0 or a negative errno.
+ *
+ * @pdev: PCI device
+ * @state: Mask of ASPM link states to enable
+ */
+int pci_enable_default_link_state(struct pci_dev *pdev, int state)
+{
+ struct pcie_link_state *link = pcie_aspm_get_link(pdev);
+
+ if (!link)
+ return -EINVAL;
+ /*
+ * A driver requested that ASPM be enabled on this device, but
+ * if we don't have permission to manage ASPM (e.g., on ACPI
+ * systems we have to observe the FADT ACPI_FADT_NO_ASPM bit and
+ * the _OSC method), we can't honor that request.
+ */
+ if (aspm_disabled) {
+ pci_warn(pdev, "can't override BIOS ASPM; OS doesn't have ASPM control\n");
+ return -EPERM;
+ }
+
+ down_read(&pci_bus_sem);
+ mutex_lock(&aspm_lock);
+ link->aspm_default = 0;
+ if (state & PCIE_LINK_STATE_L0S)
+ link->aspm_default |= ASPM_STATE_L0S;
+ if (state & PCIE_LINK_STATE_L1)
+ /* L1 PM substates require L1 */
+ link->aspm_default |= ASPM_STATE_L1 | ASPM_STATE_L1SS;
+ if (state & PCIE_LINK_STATE_L1_1)
+ link->aspm_default |= ASPM_STATE_L1_1;
+ if (state & PCIE_LINK_STATE_L1_2)
+ link->aspm_default |= ASPM_STATE_L1_2;
+ if (state & PCIE_LINK_STATE_L1_1_PCIPM)
+ link->aspm_default |= ASPM_STATE_L1_1_PCIPM;
+ if (state & PCIE_LINK_STATE_L1_2_PCIPM)
+ link->aspm_default |= ASPM_STATE_L1_2_PCIPM;
+ pcie_config_aspm_link(link, policy_to_aspm_state(link));
+
+ link->clkpm_default = (state & PCIE_LINK_STATE_CLKPM) ? 1 : 0;
+ pcie_set_clkpm(link, policy_to_clkpm_state(link));
+ mutex_unlock(&aspm_lock);
+ up_read(&pci_bus_sem);
+
+ return 0;
+}
+EXPORT_SYMBOL(pci_enable_default_link_state);
+
static int pcie_aspm_set_policy(const char *val,
const struct kernel_param *kp)
{
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 8253a5413d7c..fd710afe0209 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1641,10 +1641,15 @@ extern bool pcie_ports_native;
#define PCIE_LINK_STATE_L1_2 BIT(4)
#define PCIE_LINK_STATE_L1_1_PCIPM BIT(5)
#define PCIE_LINK_STATE_L1_2_PCIPM BIT(6)
+#define PCIE_LINK_STATE_ALL (PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1 |\
+ PCIE_LINK_STATE_CLKPM | PCIE_LINK_STATE_L1_1 |\
+ PCIE_LINK_STATE_L1_2 | PCIE_LINK_STATE_L1_1_PCIPM |\
+ PCIE_LINK_STATE_L1_2_PCIPM)
#ifdef CONFIG_PCIEASPM
int pci_disable_link_state(struct pci_dev *pdev, int state);
int pci_disable_link_state_locked(struct pci_dev *pdev, int state);
+int pci_enable_default_link_state(struct pci_dev *pdev, int state);
void pcie_no_aspm(void);
bool pcie_aspm_support_enabled(void);
bool pcie_aspm_enabled(struct pci_dev *pdev);
@@ -1653,6 +1658,8 @@ static inline int pci_disable_link_state(struct pci_dev *pdev, int state)
{ return 0; }
static inline int pci_disable_link_state_locked(struct pci_dev *pdev, int state)
{ return 0; }
+static inline int pci_enable_default_link_state(struct pci_dev *pdev, int state)
+{ return 0; }
static inline void pcie_no_aspm(void) { }
static inline bool pcie_aspm_support_enabled(void) { return false; }
static inline bool pcie_aspm_enabled(struct pci_dev *pdev) { return false; }
--
2.25.1
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