diff options
author | Dave Airlie <airlied@redhat.com> | 2016-09-28 12:08:49 +1000 |
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committer | Dave Airlie <airlied@redhat.com> | 2016-09-28 12:08:49 +1000 |
commit | ca09fb9f60b5f3ab2d57e761aaeea89a5147d784 (patch) | |
tree | 908e42ecf32d2601f4c5c340c6c4626841baa661 /drivers/net/ethernet/intel/e1000e/netdev.c | |
parent | 9f4ef05bcdcfdf911b056b471dd3c6a4f331b644 (diff) | |
parent | 08895a8b6b06ed2323cd97a36ee40a116b3db8ed (diff) | |
download | linux-ca09fb9f60b5f3ab2d57e761aaeea89a5147d784.tar.bz2 |
Merge tag 'v4.8-rc8' into drm-next
Linux 4.8-rc8
There was a lot of fallout in the imx/amdgpu/i915 drivers, so backmerge
it now to avoid troubles.
* tag 'v4.8-rc8': (1442 commits)
Linux 4.8-rc8
fault_in_multipages_readable() throws set-but-unused error
mm: check VMA flags to avoid invalid PROT_NONE NUMA balancing
radix tree: fix sibling entry handling in radix_tree_descend()
radix tree test suite: Test radix_tree_replace_slot() for multiorder entries
fix memory leaks in tracing_buffers_splice_read()
tracing: Move mutex to protect against resetting of seq data
MIPS: Fix delay slot emulation count in debugfs
MIPS: SMP: Fix possibility of deadlock when bringing CPUs online
mm: delete unnecessary and unsafe init_tlb_ubc()
huge tmpfs: fix Committed_AS leak
shmem: fix tmpfs to handle the huge= option properly
blk-mq: skip unmapped queues in blk_mq_alloc_request_hctx
MIPS: Fix pre-r6 emulation FPU initialisation
arm64: kgdb: handle read-only text / modules
arm64: Call numa_store_cpu_info() earlier.
locking/hung_task: Fix typo in CONFIG_DETECT_HUNG_TASK help text
nvme-rdma: only clear queue flags after successful connect
i2c: qup: skip qup_i2c_suspend if the device is already runtime suspended
perf/core: Limit matching exclusive events to one PMU
...
Diffstat (limited to 'drivers/net/ethernet/intel/e1000e/netdev.c')
-rw-r--r-- | drivers/net/ethernet/intel/e1000e/netdev.c | 66 |
1 files changed, 39 insertions, 27 deletions
diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c index 02f443958f31..7017281ba2dc 100644 --- a/drivers/net/ethernet/intel/e1000e/netdev.c +++ b/drivers/net/ethernet/intel/e1000e/netdev.c @@ -4303,6 +4303,42 @@ void e1000e_reinit_locked(struct e1000_adapter *adapter) } /** + * e1000e_sanitize_systim - sanitize raw cycle counter reads + * @hw: pointer to the HW structure + * @systim: cycle_t value read, sanitized and returned + * + * Errata for 82574/82583 possible bad bits read from SYSTIMH/L: + * check to see that the time is incrementing at a reasonable + * rate and is a multiple of incvalue. + **/ +static cycle_t e1000e_sanitize_systim(struct e1000_hw *hw, cycle_t systim) +{ + u64 time_delta, rem, temp; + cycle_t systim_next; + u32 incvalue; + int i; + + incvalue = er32(TIMINCA) & E1000_TIMINCA_INCVALUE_MASK; + for (i = 0; i < E1000_MAX_82574_SYSTIM_REREADS; i++) { + /* latch SYSTIMH on read of SYSTIML */ + systim_next = (cycle_t)er32(SYSTIML); + systim_next |= (cycle_t)er32(SYSTIMH) << 32; + + time_delta = systim_next - systim; + temp = time_delta; + /* VMWare users have seen incvalue of zero, don't div / 0 */ + rem = incvalue ? do_div(temp, incvalue) : (time_delta != 0); + + systim = systim_next; + + if ((time_delta < E1000_82574_SYSTIM_EPSILON) && (rem == 0)) + break; + } + + return systim; +} + +/** * e1000e_cyclecounter_read - read raw cycle counter (used by time counter) * @cc: cyclecounter structure **/ @@ -4312,7 +4348,7 @@ static cycle_t e1000e_cyclecounter_read(const struct cyclecounter *cc) cc); struct e1000_hw *hw = &adapter->hw; u32 systimel, systimeh; - cycle_t systim, systim_next; + cycle_t systim; /* SYSTIMH latching upon SYSTIML read does not work well. * This means that if SYSTIML overflows after we read it but before * we read SYSTIMH, the value of SYSTIMH has been incremented and we @@ -4335,33 +4371,9 @@ static cycle_t e1000e_cyclecounter_read(const struct cyclecounter *cc) systim = (cycle_t)systimel; systim |= (cycle_t)systimeh << 32; - if ((hw->mac.type == e1000_82574) || (hw->mac.type == e1000_82583)) { - u64 time_delta, rem, temp; - u32 incvalue; - int i; - - /* errata for 82574/82583 possible bad bits read from SYSTIMH/L - * check to see that the time is incrementing at a reasonable - * rate and is a multiple of incvalue - */ - incvalue = er32(TIMINCA) & E1000_TIMINCA_INCVALUE_MASK; - for (i = 0; i < E1000_MAX_82574_SYSTIM_REREADS; i++) { - /* latch SYSTIMH on read of SYSTIML */ - systim_next = (cycle_t)er32(SYSTIML); - systim_next |= (cycle_t)er32(SYSTIMH) << 32; - - time_delta = systim_next - systim; - temp = time_delta; - /* VMWare users have seen incvalue of zero, don't div / 0 */ - rem = incvalue ? do_div(temp, incvalue) : (time_delta != 0); - - systim = systim_next; + if (adapter->flags2 & FLAG2_CHECK_SYSTIM_OVERFLOW) + systim = e1000e_sanitize_systim(hw, systim); - if ((time_delta < E1000_82574_SYSTIM_EPSILON) && - (rem == 0)) - break; - } - } return systim; } |