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PCI: Add decoding for 16 GT/s link speed 

PCIe 4.0 defines the 16.0 GT/s link speed.  Links can run at that speed
without any Linux changes, but previously their sysfs "max_link_speed" and
"current_link_speed" files contained "Unknown speed", not the expected
"16.0 GT/s".

Add decoding for the new 16 GT/s link speed.

Signed-off-by: Jay Fang <f.fangjian@huawei.com>
[bhelgaas: add PCI_EXP_LNKCAP2_SLS_16_0GB]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Dongdong Liu <liudongdong3@huawei.com>
This commit is contained in:
Jay Fang 2018-03-12 17:13:32 +08:00 committed by Bjorn Helgaas
parent 7928b2cbe5
commit 1acfb9b7ee
5 changed files with 14 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/pci/pci-sysfs.c
View File

@ -168,6 +168,9 @@ static ssize_t max_link_speed_show(struct device *dev,
return -EINVAL;
switch (linkcap & PCI_EXP_LNKCAP_SLS) {
case PCI_EXP_LNKCAP_SLS_16_0GB:
speed = "16 GT/s";
break;
case PCI_EXP_LNKCAP_SLS_8_0GB:
speed = "8 GT/s";
break;
@ -213,6 +216,9 @@ static ssize_t current_link_speed_show(struct device *dev,
return -EINVAL;
switch (linkstat & PCI_EXP_LNKSTA_CLS) {
case PCI_EXP_LNKSTA_CLS_16_0GB:
speed = "16 GT/s";
break;
case PCI_EXP_LNKSTA_CLS_8_0GB:
speed = "8 GT/s";
break;

2
drivers/pci/probe.c
View File

@ -592,7 +592,7 @@ const unsigned char pcie_link_speed[] = {
PCIE_SPEED_2_5GT, /* 1 */
PCIE_SPEED_5_0GT, /* 2 */
PCIE_SPEED_8_0GT, /* 3 */
PCI_SPEED_UNKNOWN, /* 4 */
PCIE_SPEED_16_0GT, /* 4 */
PCI_SPEED_UNKNOWN, /* 5 */
PCI_SPEED_UNKNOWN, /* 6 */
PCI_SPEED_UNKNOWN, /* 7 */

1
drivers/pci/slot.c
View File

@ -76,6 +76,7 @@ static const char *pci_bus_speed_strings[] = {
"2.5 GT/s PCIe", /* 0x14 */
"5.0 GT/s PCIe", /* 0x15 */
"8.0 GT/s PCIe", /* 0x16 */
"16.0 GT/s PCIe", /* 0x17 */
};
static ssize_t bus_speed_read(enum pci_bus_speed speed, char *buf)

1
include/linux/pci.h
View File

@ -256,6 +256,7 @@ enum pci_bus_speed {
PCIE_SPEED_2_5GT = 0x14,
PCIE_SPEED_5_0GT = 0x15,
PCIE_SPEED_8_0GT = 0x16,
PCIE_SPEED_16_0GT = 0x17,
PCI_SPEED_UNKNOWN = 0xff,
};

7
include/uapi/linux/pci_regs.h
View File

@ -520,6 +520,7 @@
#define PCI_EXP_LNKCAP_SLS_2_5GB 0x00000001 /* LNKCAP2 SLS Vector bit 0 */
#define PCI_EXP_LNKCAP_SLS_5_0GB 0x00000002 /* LNKCAP2 SLS Vector bit 1 */
#define PCI_EXP_LNKCAP_SLS_8_0GB 0x00000003 /* LNKCAP2 SLS Vector bit 2 */
#define PCI_EXP_LNKCAP_SLS_16_0GB 0x00000004 /* LNKCAP2 SLS Vector bit 3 */
#define PCI_EXP_LNKCAP_MLW 0x000003f0 /* Maximum Link Width */
#define PCI_EXP_LNKCAP_ASPMS 0x00000c00 /* ASPM Support */
#define PCI_EXP_LNKCAP_L0SEL 0x00007000 /* L0s Exit Latency */
@ -547,6 +548,7 @@
#define PCI_EXP_LNKSTA_CLS_2_5GB 0x0001 /* Current Link Speed 2.5GT/s */
#define PCI_EXP_LNKSTA_CLS_5_0GB 0x0002 /* Current Link Speed 5.0GT/s */
#define PCI_EXP_LNKSTA_CLS_8_0GB 0x0003 /* Current Link Speed 8.0GT/s */
#define PCI_EXP_LNKSTA_CLS_16_0GB 0x0004 /* Current Link Speed 16.0GT/s */
#define PCI_EXP_LNKSTA_NLW 0x03f0 /* Negotiated Link Width */
#define PCI_EXP_LNKSTA_NLW_X1 0x0010 /* Current Link Width x1 */
#define PCI_EXP_LNKSTA_NLW_X2 0x0020 /* Current Link Width x2 */
@ -648,8 +650,9 @@
#define PCI_CAP_EXP_RC_ENDPOINT_SIZEOF_V2 44 /* v2 endpoints without link end here */
#define PCI_EXP_LNKCAP2 44 /* Link Capabilities 2 */
#define PCI_EXP_LNKCAP2_SLS_2_5GB 0x00000002 /* Supported Speed 2.5GT/s */
#define PCI_EXP_LNKCAP2_SLS_5_0GB 0x00000004 /* Supported Speed 5.0GT/s */
#define PCI_EXP_LNKCAP2_SLS_8_0GB 0x00000008 /* Supported Speed 8.0GT/s */
#define PCI_EXP_LNKCAP2_SLS_5_0GB 0x00000004 /* Supported Speed 5GT/s */
#define PCI_EXP_LNKCAP2_SLS_8_0GB 0x00000008 /* Supported Speed 8GT/s */
#define PCI_EXP_LNKCAP2_SLS_16_0GB 0x00000010 /* Supported Speed 16GT/s */
#define PCI_EXP_LNKCAP2_CROSSLINK 0x00000100 /* Crosslink supported */
#define PCI_EXP_LNKCTL2 48 /* Link Control 2 */
#define PCI_EXP_LNKSTA2 50 /* Link Status 2 */