@@ -291,8 +291,8 @@ static void pcie_wait_for_presence(struct pci_dev *pdev)
int pciehp_check_link_status(struct controller *ctrl)
{
struct pci_dev *pdev = ctrl_dev(ctrl);
+ u16 lnk_status, linksta2;
bool found;
- u16 lnk_status;
if (!pcie_wait_for_link(pdev, true)) {
ctrl_info(ctrl, "Slot(%s): No link\n", slot_name(ctrl));
@@ -319,7 +319,8 @@ int pciehp_check_link_status(struct controller *ctrl)
return -1;
}
- __pcie_update_link_speed(ctrl->pcie->port->subordinate, lnk_status);
+ pcie_capability_read_word(pdev, PCI_EXP_LNKSTA2, &linksta2);
+ __pcie_update_link_speed(ctrl->pcie->port->subordinate, lnk_status, linksta2);
if (!found) {
ctrl_info(ctrl, "Slot(%s): No device found\n",
@@ -6164,21 +6164,25 @@ void __pcie_print_link_status(struct pci_dev *dev, bool verbose)
enum pci_bus_speed speed, speed_cap;
struct pci_dev *limiting_dev = NULL;
u32 bw_avail, bw_cap;
+ char *flit_mode = "";
bw_cap = pcie_bandwidth_capable(dev, &speed_cap, &width_cap);
bw_avail = pcie_bandwidth_available(dev, &limiting_dev, &speed, &width);
+ if (dev->bus && dev->bus->flit_mode)
+ flit_mode = ", in Flit mode";
+
if (bw_avail >= bw_cap && verbose)
- pci_info(dev, "%u.%03u Gb/s available PCIe bandwidth (%s x%d link)\n",
+ pci_info(dev, "%u.%03u Gb/s available PCIe bandwidth (%s x%d link)%s\n",
bw_cap / 1000, bw_cap % 1000,
- pci_speed_string(speed_cap), width_cap);
+ pci_speed_string(speed_cap), width_cap, flit_mode);
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",
+ 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)%s\n",
bw_avail / 1000, bw_avail % 1000,
pci_speed_string(speed), width,
limiting_dev ? pci_name(limiting_dev) : "<unknown>",
bw_cap / 1000, bw_cap % 1000,
- pci_speed_string(speed_cap), width_cap);
+ pci_speed_string(speed_cap), width_cap, flit_mode);
}
/**
@@ -298,9 +298,10 @@ enum pcie_link_width pcie_get_width_cap(struct pci_dev *dev);
void __pcie_print_link_status(struct pci_dev *dev, bool verbose);
void pcie_report_downtraining(struct pci_dev *dev);
-static inline void __pcie_update_link_speed(struct pci_bus *bus, u16 linksta)
+static inline void __pcie_update_link_speed(struct pci_bus *bus, u16 linksta, u16 linksta2)
{
bus->cur_bus_speed = pcie_link_speed[linksta & PCI_EXP_LNKSTA_CLS];
+ bus->flit_mode = linksta2 & PCI_EXP_LNKSTA2_FLIT;
}
void pcie_update_link_speed(struct pci_bus *bus);
@@ -745,10 +745,11 @@ EXPORT_SYMBOL_GPL(pci_speed_string);
void pcie_update_link_speed(struct pci_bus *bus)
{
struct pci_dev *bridge = bus->self;
- u16 linksta;
+ u16 linksta, linksta2;
pcie_capability_read_word(bridge, PCI_EXP_LNKSTA, &linksta);
- __pcie_update_link_speed(bus, linksta);
+ pcie_capability_read_word(bridge, PCI_EXP_LNKSTA2, &linksta2);
+ __pcie_update_link_speed(bus, linksta, linksta2);
}
EXPORT_SYMBOL_GPL(pcie_update_link_speed);
@@ -680,6 +680,7 @@ struct pci_bus {
struct bin_attribute *legacy_mem; /* Legacy mem */
unsigned int is_added:1;
unsigned int unsafe_warn:1; /* warned about RW1C config write */
+ bool flit_mode; /* Link in Flit mode */
};
#define to_pci_bus(n) container_of(n, struct pci_bus, dev)
PCIe r6.0 added Flit mode that mainly alters HW behavior but some OS visible changes are also because of it. The OS visible changes include differences in the layout of some capabilities and interpretation of the TLP headers (in diagnostics situations). To be able to determine which mode the PCIe link is using, store the Flit Mode Status (PCIe r6.1 sec 7.5.3.20) information in addition to the link speed into struct pci_bus in pcie_update_link_speed(). Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> --- drivers/pci/hotplug/pciehp_hpc.c | 5 +++-- drivers/pci/pci.c | 12 ++++++++---- drivers/pci/pci.h | 3 ++- drivers/pci/probe.c | 5 +++-- include/linux/pci.h | 1 + 5 files changed, 17 insertions(+), 9 deletions(-)