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Message-Id: <20250123071326.1810751-1-18255117159@163.com>
Date: Thu, 23 Jan 2025 15:13:26 +0800
From: Hans Zhang <18255117159@....com>
To: jingoohan1@...il.com
Cc: manivannan.sadhasivam@...aro.org,
lpieralisi@...nel.org,
kw@...ux.com,
robh@...nel.org,
bhelgaas@...gle.com,
linux-pci@...r.kernel.org,
linux-kernel@...r.kernel.org,
rockswang7@...il.com,
Hans Zhang <18255117159@....com>
Subject: [PATCH] PCI: dwc: Add the sysfs property to provide the LTSSM status of the PCIe link
Add the sysfs property to provide a view of the current link's LTSSM
status from the root port device.
/sys/bus/pci/devices/<dev>/ltssm_status
Signed-off-by: Hans Zhang <18255117159@....com>
---
.../pci/controller/dwc/pcie-designware-host.c | 86 +++++++++++++++++++
drivers/pci/controller/dwc/pcie-designware.h | 32 +++++++
drivers/pci/pci-sysfs.c | 3 +
drivers/pci/pci.h | 4 +
4 files changed, 125 insertions(+)
diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index d2291c3ceb8b..8ec0e35cca8f 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -418,6 +418,92 @@ static void dw_pcie_host_request_msg_tlp_res(struct dw_pcie_rp *pp)
}
}
+static char *dw_ltssm_sts_string(enum dw_pcie_ltssm ltssm)
+{
+ char *str;
+
+ switch (ltssm) {
+#define DW_PCIE_LTSSM_NAME(n) case n: str = #n; break
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_DETECT_QUIET);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_DETECT_ACT);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_POLL_ACTIVE);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_POLL_COMPLIANCE);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_POLL_CONFIG);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_PRE_DETECT_QUIET);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_DETECT_WAIT);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_CFG_LINKWD_START);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_CFG_LINKWD_ACEPT);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_CFG_LANENUM_WAI);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_CFG_LANENUM_ACEPT);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_CFG_COMPLETE);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_CFG_IDLE);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_RCVRY_LOCK);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_RCVRY_SPEED);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_RCVRY_RCVRCFG);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_RCVRY_IDLE);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_L0);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_L0S);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_L123_SEND_EIDLE);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_L1_IDLE);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_L2_IDLE);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_L2_WAKE);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_DISABLED_ENTRY);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_DISABLED_IDLE);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_DISABLED);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_LPBK_ENTRY);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_LPBK_ACTIVE);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_LPBK_EXIT);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_LPBK_EXIT_TIMEOUT);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_HOT_RESET_ENTRY);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_HOT_RESET);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_RCVRY_EQ0);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_RCVRY_EQ1);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_RCVRY_EQ2);
+ DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_RCVRY_EQ3);
+ default:
+ str = "DW_PCIE_LTSSM_UNKNOWN";
+ break;
+ }
+
+ return str;
+}
+
+static ssize_t ltssm_status_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct pci_host_bridge *bridge = pci_find_host_bridge(pdev->bus);
+ struct dw_pcie_rp *pp = bridge->sysdata;
+ struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+
+ return sysfs_emit(buf, "%s\n",
+ dw_ltssm_sts_string(dw_pcie_get_ltssm(pci)));
+}
+static DEVICE_ATTR_RO(ltssm_status);
+
+static struct attribute *ltssm_status_attrs[] __ro_after_init = {
+ &dev_attr_ltssm_status.attr, NULL
+};
+
+static umode_t ltssm_status_attrs_are_visible(struct kobject *kobj,
+ struct attribute *a, int n)
+{
+ struct device *dev = kobj_to_dev(kobj);
+ struct pci_dev *pdev = to_pci_dev(dev);
+
+ if ((a == &dev_attr_ltssm_status.attr) &&
+ ((pci_pcie_type(pdev) != PCI_EXP_TYPE_ROOT_PORT) &&
+ (pci_pcie_type(pdev) != PCI_EXP_TYPE_RC_EC)))
+ return 0;
+
+ return a->mode;
+}
+
+const struct attribute_group dw_ltssm_status_attr_group = {
+ .attrs = ltssm_status_attrs,
+ .is_visible = ltssm_status_attrs_are_visible,
+};
+
int dw_pcie_host_init(struct dw_pcie_rp *pp)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 347ab74ac35a..fb7e3c14e523 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -330,8 +330,40 @@ enum dw_pcie_ltssm {
/* Need to align with PCIE_PORT_DEBUG0 bits 0:5 */
DW_PCIE_LTSSM_DETECT_QUIET = 0x0,
DW_PCIE_LTSSM_DETECT_ACT = 0x1,
+ DW_PCIE_LTSSM_POLL_ACTIVE = 0x2,
+ DW_PCIE_LTSSM_POLL_COMPLIANCE = 0x3,
+ DW_PCIE_LTSSM_POLL_CONFIG = 0x4,
+ DW_PCIE_LTSSM_PRE_DETECT_QUIET = 0x5,
+ DW_PCIE_LTSSM_DETECT_WAIT = 0x6,
+ DW_PCIE_LTSSM_CFG_LINKWD_START = 0x7,
+ DW_PCIE_LTSSM_CFG_LINKWD_ACEPT = 0x8,
+ DW_PCIE_LTSSM_CFG_LANENUM_WAI = 0x9,
+ DW_PCIE_LTSSM_CFG_LANENUM_ACEPT = 0xa,
+ DW_PCIE_LTSSM_CFG_COMPLETE = 0xb,
+ DW_PCIE_LTSSM_CFG_IDLE = 0xc,
+ DW_PCIE_LTSSM_RCVRY_LOCK = 0xd,
+ DW_PCIE_LTSSM_RCVRY_SPEED = 0xe,
+ DW_PCIE_LTSSM_RCVRY_RCVRCFG = 0xf,
+ DW_PCIE_LTSSM_RCVRY_IDLE = 0x10,
DW_PCIE_LTSSM_L0 = 0x11,
+ DW_PCIE_LTSSM_L0S = 0x12,
+ DW_PCIE_LTSSM_L123_SEND_EIDLE = 0x13,
+ DW_PCIE_LTSSM_L1_IDLE = 0x14,
DW_PCIE_LTSSM_L2_IDLE = 0x15,
+ DW_PCIE_LTSSM_L2_WAKE = 0x16,
+ DW_PCIE_LTSSM_DISABLED_ENTRY = 0x17,
+ DW_PCIE_LTSSM_DISABLED_IDLE = 0x18,
+ DW_PCIE_LTSSM_DISABLED = 0x19,
+ DW_PCIE_LTSSM_LPBK_ENTRY = 0x1a,
+ DW_PCIE_LTSSM_LPBK_ACTIVE = 0x1b,
+ DW_PCIE_LTSSM_LPBK_EXIT = 0x1c,
+ DW_PCIE_LTSSM_LPBK_EXIT_TIMEOUT = 0x1d,
+ DW_PCIE_LTSSM_HOT_RESET_ENTRY = 0x1e,
+ DW_PCIE_LTSSM_HOT_RESET = 0x1f,
+ DW_PCIE_LTSSM_RCVRY_EQ0 = 0x20,
+ DW_PCIE_LTSSM_RCVRY_EQ1 = 0x21,
+ DW_PCIE_LTSSM_RCVRY_EQ2 = 0x22,
+ DW_PCIE_LTSSM_RCVRY_EQ3 = 0x23,
DW_PCIE_LTSSM_UNKNOWN = 0xFFFFFFFF,
};
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 7679d75d71e5..c23d188323f4 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -1696,6 +1696,9 @@ const struct attribute_group *pci_dev_attr_groups[] = {
#endif
#ifdef CONFIG_PCIEASPM
&aspm_ctrl_attr_group,
+#endif
+#ifdef CONFIG_PCIE_DW_HOST
+ &dw_ltssm_status_attr_group,
#endif
NULL,
};
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 2e40fc63ba31..3775841b5714 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -960,6 +960,10 @@ static inline pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
extern const struct attribute_group aspm_ctrl_attr_group;
#endif
+#ifdef CONFIG_PCIE_DW_HOST
+extern const struct attribute_group dw_ltssm_status_attr_group;
+#endif
+
extern const struct attribute_group pci_dev_reset_method_attr_group;
#ifdef CONFIG_X86_INTEL_MID
base-commit: 7004a2e46d1693848370809aa3d9c340a209edbb
--
2.25.1
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