From 01d7ada57ee9c735bd71fbe44ec0bcb70847afd4 Mon Sep 17 00:00:00 2001 From: "Christopher S. Hall" Date: Mon, 22 Feb 2016 03:15:26 -0800 Subject: [PATCH] e1000e: Adds hardware supported cross timestamp on e1000e nic Modern Intel systems supports cross timestamping of the network device clock and Always Running Timer (ART) in hardware. This allows the device time and system time to be precisely correlated. The timestamp pair is returned through e1000e_phc_get_syncdevicetime() used by get_system_device_crosststamp(). The hardware cross-timestamp result is made available to applications through the PTP_SYS_OFFSET_PRECISE ioctl which calls e1000e_phc_getcrosststamp(). Cc: Prarit Bhargava Cc: Richard Cochran Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Andy Lutomirski Cc: Jeff Kirsher Cc: kevin.b.stanton@intel.com Cc: kevin.j.clarke@intel.com Cc: hpa@zytor.com Cc: jeffrey.t.kirsher@intel.com Cc: netdev@vger.kernel.org Acked-by: Jeff Kirsher Signed-off-by: Christopher S. Hall [jstultz: Reworked to use new interface, commit message tweaks] Signed-off-by: John Stultz --- drivers/net/ethernet/intel/Kconfig | 9 +++ drivers/net/ethernet/intel/e1000e/defines.h | 5 ++ drivers/net/ethernet/intel/e1000e/ptp.c | 85 +++++++++++++++++++++ drivers/net/ethernet/intel/e1000e/regs.h | 4 + 4 files changed, 103 insertions(+) diff --git a/drivers/net/ethernet/intel/Kconfig b/drivers/net/ethernet/intel/Kconfig index fa593dd3efe1..3772f3ac956e 100644 --- a/drivers/net/ethernet/intel/Kconfig +++ b/drivers/net/ethernet/intel/Kconfig @@ -83,6 +83,15 @@ config E1000E To compile this driver as a module, choose M here. The module will be called e1000e. +config E1000E_HWTS + bool "Support HW cross-timestamp on PCH devices" + default y + depends on E1000E && X86 + ---help--- + Say Y to enable hardware supported cross-timestamping on PCH + devices. The cross-timestamp is available through the PTP clock + driver precise cross-timestamp ioctl (PTP_SYS_OFFSET_PRECISE). + config IGB tristate "Intel(R) 82575/82576 PCI-Express Gigabit Ethernet support" depends on PCI diff --git a/drivers/net/ethernet/intel/e1000e/defines.h b/drivers/net/ethernet/intel/e1000e/defines.h index f7c7804d79e5..0641c0098738 100644 --- a/drivers/net/ethernet/intel/e1000e/defines.h +++ b/drivers/net/ethernet/intel/e1000e/defines.h @@ -528,6 +528,11 @@ #define E1000_RXCW_C 0x20000000 /* Receive config */ #define E1000_RXCW_SYNCH 0x40000000 /* Receive config synch */ +/* HH Time Sync */ +#define E1000_TSYNCTXCTL_MAX_ALLOWED_DLY_MASK 0x0000F000 /* max delay */ +#define E1000_TSYNCTXCTL_SYNC_COMP 0x40000000 /* sync complete */ +#define E1000_TSYNCTXCTL_START_SYNC 0x80000000 /* initiate sync */ + #define E1000_TSYNCTXCTL_VALID 0x00000001 /* Tx timestamp valid */ #define E1000_TSYNCTXCTL_ENABLED 0x00000010 /* enable Tx timestamping */ diff --git a/drivers/net/ethernet/intel/e1000e/ptp.c b/drivers/net/ethernet/intel/e1000e/ptp.c index 25a0ad5102d6..e2ff3ef75d5d 100644 --- a/drivers/net/ethernet/intel/e1000e/ptp.c +++ b/drivers/net/ethernet/intel/e1000e/ptp.c @@ -26,6 +26,12 @@ #include "e1000.h" +#ifdef CONFIG_E1000E_HWTS +#include +#include +#include +#endif + /** * e1000e_phc_adjfreq - adjust the frequency of the hardware clock * @ptp: ptp clock structure @@ -98,6 +104,78 @@ static int e1000e_phc_adjtime(struct ptp_clock_info *ptp, s64 delta) return 0; } +#ifdef CONFIG_E1000E_HWTS +#define MAX_HW_WAIT_COUNT (3) + +/** + * e1000e_phc_get_syncdevicetime - Callback given to timekeeping code reads system/device registers + * @device: current device time + * @system: system counter value read synchronously with device time + * @ctx: context provided by timekeeping code + * + * Read device and system (ART) clock simultaneously and return the corrected + * clock values in ns. + **/ +static int e1000e_phc_get_syncdevicetime(ktime_t *device, + struct system_counterval_t *system, + void *ctx) +{ + struct e1000_adapter *adapter = (struct e1000_adapter *)ctx; + struct e1000_hw *hw = &adapter->hw; + unsigned long flags; + int i; + u32 tsync_ctrl; + cycle_t dev_cycles; + cycle_t sys_cycles; + + tsync_ctrl = er32(TSYNCTXCTL); + tsync_ctrl |= E1000_TSYNCTXCTL_START_SYNC | + E1000_TSYNCTXCTL_MAX_ALLOWED_DLY_MASK; + ew32(TSYNCTXCTL, tsync_ctrl); + for (i = 0; i < MAX_HW_WAIT_COUNT; ++i) { + udelay(1); + tsync_ctrl = er32(TSYNCTXCTL); + if (tsync_ctrl & E1000_TSYNCTXCTL_SYNC_COMP) + break; + } + + if (i == MAX_HW_WAIT_COUNT) + return -ETIMEDOUT; + + dev_cycles = er32(SYSSTMPH); + dev_cycles <<= 32; + dev_cycles |= er32(SYSSTMPL); + spin_lock_irqsave(&adapter->systim_lock, flags); + *device = ns_to_ktime(timecounter_cyc2time(&adapter->tc, dev_cycles)); + spin_unlock_irqrestore(&adapter->systim_lock, flags); + + sys_cycles = er32(PLTSTMPH); + sys_cycles <<= 32; + sys_cycles |= er32(PLTSTMPL); + *system = convert_art_to_tsc(sys_cycles); + + return 0; +} + +/** + * e1000e_phc_getsynctime - Reads the current system/device cross timestamp + * @ptp: ptp clock structure + * @cts: structure containing timestamp + * + * Read device and system (ART) clock simultaneously and return the scaled + * clock values in ns. + **/ +static int e1000e_phc_getcrosststamp(struct ptp_clock_info *ptp, + struct system_device_crosststamp *xtstamp) +{ + struct e1000_adapter *adapter = container_of(ptp, struct e1000_adapter, + ptp_clock_info); + + return get_device_system_crosststamp(e1000e_phc_get_syncdevicetime, + adapter, NULL, xtstamp); +} +#endif/*CONFIG_E1000E_HWTS*/ + /** * e1000e_phc_gettime - Reads the current time from the hardware clock * @ptp: ptp clock structure @@ -236,6 +314,13 @@ void e1000e_ptp_init(struct e1000_adapter *adapter) break; } +#ifdef CONFIG_E1000E_HWTS + /* CPU must have ART and GBe must be from Sunrise Point or greater */ + if (hw->mac.type >= e1000_pch_spt && boot_cpu_has(X86_FEATURE_ART)) + adapter->ptp_clock_info.getcrosststamp = + e1000e_phc_getcrosststamp; +#endif/*CONFIG_E1000E_HWTS*/ + INIT_DELAYED_WORK(&adapter->systim_overflow_work, e1000e_systim_overflow_work); diff --git a/drivers/net/ethernet/intel/e1000e/regs.h b/drivers/net/ethernet/intel/e1000e/regs.h index 1d5e0b77062a..0cb4d365e5ad 100644 --- a/drivers/net/ethernet/intel/e1000e/regs.h +++ b/drivers/net/ethernet/intel/e1000e/regs.h @@ -245,6 +245,10 @@ #define E1000_SYSTIML 0x0B600 /* System time register Low - RO */ #define E1000_SYSTIMH 0x0B604 /* System time register High - RO */ #define E1000_TIMINCA 0x0B608 /* Increment attributes register - RW */ +#define E1000_SYSSTMPL 0x0B648 /* HH Timesync system stamp low register */ +#define E1000_SYSSTMPH 0x0B64C /* HH Timesync system stamp hi register */ +#define E1000_PLTSTMPL 0x0B640 /* HH Timesync platform stamp low register */ +#define E1000_PLTSTMPH 0x0B644 /* HH Timesync platform stamp hi register */ #define E1000_RXMTRL 0x0B634 /* Time sync Rx EtherType and Msg Type - RW */ #define E1000_RXUDP 0x0B638 /* Time Sync Rx UDP Port - RW */ -- 2.20.1