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Commit 1d5224ec authored by Tony Truong's avatar Tony Truong
Browse files

msm: pcie: add sysfs entry to output PCIe link ASPM stats 



Provide users a way to check how many times the link between
root complex and its partner have entered L0s, L1, L1.1, and
L1.2.

Change-Id: If3170d26221d05039afc0a2433bebaf0c3799549
Signed-off-by: default avatarTony Truong <truong@codeaurora.org>
parent 6461a1d8

drivers/pci/controller/pci-msm.c

+36 −0
Original line number Diff line number Diff line
@@ -83,6 +83,11 @@ 
#define PCIE20_LINK_DOWN_AXI_ECAM_BLOCK_STATUS (0x630)

#define PCIE20_PARF_STATUS (0x230)



#define PCIE20_PARF_DEBUG_CNT_IN_L0S (0xc10)

#define PCIE20_PARF_DEBUG_CNT_IN_L1 (0xc0c)

#define PCIE20_PARF_DEBUG_CNT_IN_L1SUB_L1 (0xc84)

#define PCIE20_PARF_DEBUG_CNT_IN_L1SUB_L2 (0xc88)



#define PCIE20_PARF_CLKREQ_OVERRIDE (0x2b0)

#define PCIE20_PARF_CLKREQ_IN_VALUE (BIT(3))

#define PCIE20_PARF_CLKREQ_IN_ENABLE (BIT(1))
@@ -2136,6 +2141,36 @@ static ssize_t enumerate_store(struct device *dev, 
}

static DEVICE_ATTR_WO(enumerate);



static ssize_t aspm_stat_show(struct device *dev,

				struct device_attribute *attr,

				char *buf)

{

	struct msm_pcie_dev_t *pcie_dev = dev_get_drvdata(dev);



	if (!pcie_dev->mhi)

		return scnprintf(buf, PAGE_SIZE,

				 "PCIe: RC%d: No dev or MHI space found\n",

				 pcie_dev->rc_idx);



	if (pcie_dev->link_status != MSM_PCIE_LINK_ENABLED)

		return scnprintf(buf, PAGE_SIZE,

				 "PCIe: RC%d: registers are not accessible\n",

				 pcie_dev->rc_idx);



	return scnprintf(buf, PAGE_SIZE,

			 "PCIe: RC%d: L0s: %u L1: %u L1.1: %u L1.2: %u\n",

			 pcie_dev->rc_idx,

			 readl_relaxed(pcie_dev->mhi +

				       PCIE20_PARF_DEBUG_CNT_IN_L0S),

			 readl_relaxed(pcie_dev->mhi +

				       PCIE20_PARF_DEBUG_CNT_IN_L1),

			 readl_relaxed(pcie_dev->mhi +

				       PCIE20_PARF_DEBUG_CNT_IN_L1SUB_L1),

			 readl_relaxed(pcie_dev->mhi +

				       PCIE20_PARF_DEBUG_CNT_IN_L1SUB_L2));

}

static DEVICE_ATTR_RO(aspm_stat);



static ssize_t l23_rdy_poll_timeout_show(struct device *dev,

					struct device_attribute *attr,

					char *buf)
@@ -2170,6 +2205,7 @@ static DEVICE_ATTR_RW(l23_rdy_poll_timeout); 
static struct attribute *msm_pcie_debug_attrs[] = {

	&dev_attr_link_check_max_count.attr,

	&dev_attr_enumerate.attr,

	&dev_attr_aspm_stat.attr,

	&dev_attr_l23_rdy_poll_timeout.attr,

	NULL,

};