PCI: Use pci_speed_string() for all PCI/PCI-X/PCIe strings

Previously some PCI speed strings came from pci_speed_string(), some came
from the PCIe-specific PCIE_SPEED2STR(), and some came from a PCIe-specific
switch statement.  These methods were inconsistent:

  pci_speed_string()     PCIE_SPEED2STR()     switch
  ------------------     ----------------     ------
  33 MHz PCI
  ...
  2.5 GT/s PCIe          2.5 GT/s             2.5 GT/s
  5.0 GT/s PCIe          5 GT/s               5 GT/s
  8.0 GT/s PCIe          8 GT/s               8 GT/s
  16.0 GT/s PCIe         16 GT/s              16 GT/s
  32.0 GT/s PCIe         32 GT/s              32 GT/s

Standardize on pci_speed_string() as the single source of these strings.

Note that this adds ".0" and "PCIe" to some messages, including sysfs
"max_link_speed" files, a brcmstb "link up" message, and the link status
dmesg logging, e.g.,

  nvme 0000:01:00.0: 16.000 Gb/s available PCIe bandwidth, limited by 5.0 GT/s PCIe x4 link at 0000:00:01.1 (capable of 31.504 Gb/s with 8.0 GT/s PCIe x4 link)

I think it's better to standardize on a single version of the speed text.
Previously we had strings like this:

  /sys/bus/pci/slots/0/cur_bus_speed: 8.0 GT/s PCIe
  /sys/bus/pci/slots/0/max_bus_speed: 8.0 GT/s PCIe
  /sys/devices/pci0000:00/0000:00:1c.0/current_link_speed: 8 GT/s
  /sys/devices/pci0000:00/0000:00:1c.0/max_link_speed: 8 GT/s

This changes the latter two to match the slots files:

  /sys/devices/pci0000:00/0000:00:1c.0/current_link_speed: 8.0 GT/s PCIe
  /sys/devices/pci0000:00/0000:00:1c.0/max_link_speed: 8.0 GT/s PCIe

Based-on-patch by: Yicong Yang <yangyicong@hisilicon.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
index d20aabc..7234eb2 100644 (file)
--- a/drivers/pci/controller/pcie-brcmstb.c
+++ b/drivers/pci/controller/pcie-brcmstb.c
@@ -824,8 +824,8 @@ static int brcm_pcie_setup(struct brcm_pcie *pcie)
        cls = FIELD_GET(PCI_EXP_LNKSTA_CLS, lnksta);
        nlw = FIELD_GET(PCI_EXP_LNKSTA_NLW, lnksta);
        dev_info(dev, "link up, %s x%u %s\n",
-                PCIE_SPEED2STR(cls + PCI_SPEED_133MHz_PCIX_533),
-                nlw, ssc_good ? "(SSC)" : "(!SSC)");
+                pci_speed_string(pcie_link_speed[cls]), nlw,
+                ssc_good ? "(SSC)" : "(!SSC)");
 
        /* PCIe->SCB endian mode for BAR */
        tmp = readl(base + PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1);

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 13f766d..d123d10 100644 (file)
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -156,7 +156,8 @@ static ssize_t max_link_speed_show(struct device *dev,
 {
        struct pci_dev *pdev = to_pci_dev(dev);
 
-       return sprintf(buf, "%s\n", PCIE_SPEED2STR(pcie_get_speed_cap(pdev)));
+       return sprintf(buf, "%s\n",
+                      pci_speed_string(pcie_get_speed_cap(pdev)));
 }
 static DEVICE_ATTR_RO(max_link_speed);
 
@@ -175,33 +176,15 @@ static ssize_t current_link_speed_show(struct device *dev,
        struct pci_dev *pci_dev = to_pci_dev(dev);
        u16 linkstat;
        int err;
-       const char *speed;
+       enum pci_bus_speed speed;
 
        err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
        if (err)
                return -EINVAL;
 
-       switch (linkstat & PCI_EXP_LNKSTA_CLS) {
-       case PCI_EXP_LNKSTA_CLS_32_0GB:
-               speed = "32 GT/s";
-               break;
-       case PCI_EXP_LNKSTA_CLS_16_0GB:
-               speed = "16 GT/s";
-               break;
-       case PCI_EXP_LNKSTA_CLS_8_0GB:
-               speed = "8 GT/s";
-               break;
-       case PCI_EXP_LNKSTA_CLS_5_0GB:
-               speed = "5 GT/s";
-               break;
-       case PCI_EXP_LNKSTA_CLS_2_5GB:
-               speed = "2.5 GT/s";
-               break;
-       default:
-               speed = "Unknown speed";
-       }
+       speed = pcie_link_speed[linkstat & PCI_EXP_LNKSTA_CLS];
 
-       return sprintf(buf, "%s\n", speed);
+       return sprintf(buf, "%s\n", pci_speed_string(speed));
 }
 static DEVICE_ATTR_RO(current_link_speed);
 

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index d828ca8..421587b 100644 (file)
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -5872,14 +5872,14 @@ void __pcie_print_link_status(struct pci_dev *dev, bool verbose)
        if (bw_avail >= bw_cap && verbose)
                pci_info(dev, "%u.%03u Gb/s available PCIe bandwidth (%s x%d link)\n",
                         bw_cap / 1000, bw_cap % 1000,
-                        PCIE_SPEED2STR(speed_cap), width_cap);
+                        pci_speed_string(speed_cap), width_cap);
        else if (bw_avail < bw_cap)
                pci_info(dev, "%u.%03u Gb/s available PCIe bandwidth, limited by %s x%d link at %s (capable of %u.%03u Gb/s with %s x%d link)\n",
                         bw_avail / 1000, bw_avail % 1000,
-                        PCIE_SPEED2STR(speed), width,
+                        pci_speed_string(speed), width,
                         limiting_dev ? pci_name(limiting_dev) : "<unknown>",
                         bw_cap / 1000, bw_cap % 1000,
-                        PCIE_SPEED2STR(speed_cap), width_cap);
+                        pci_speed_string(speed_cap), width_cap);
 }
 
 /**

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 809753b..01f5d7f 100644 (file)
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -292,15 +292,6 @@ void pci_disable_bridge_window(struct pci_dev *dev);
 struct pci_bus *pci_bus_get(struct pci_bus *bus);
 void pci_bus_put(struct pci_bus *bus);
 
-/* PCIe link information */
-#define PCIE_SPEED2STR(speed) \
-       ((speed) == PCIE_SPEED_32_0GT ? "32 GT/s" : \
-        (speed) == PCIE_SPEED_16_0GT ? "16 GT/s" : \
-        (speed) == PCIE_SPEED_8_0GT ? "8 GT/s" : \
-        (speed) == PCIE_SPEED_5_0GT ? "5 GT/s" : \
-        (speed) == PCIE_SPEED_2_5GT ? "2.5 GT/s" : \
-        "Unknown speed")
-
 /* PCIe speed to Mb/s reduced by encoding overhead */
 #define PCIE_SPEED2MBS_ENC(speed) \
        ((speed) == PCIE_SPEED_32_0GT ? 32000*128/130 : \