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| author | Reza Arbab <arbab@linux.vnet.ibm.com> | 2017-11-21 17:42:46 -0600 |
|---|---|---|
| committer | Stewart Smith <stewart@linux.vnet.ibm.com> | 2017-11-21 21:05:06 -0600 |
| commit | a752f2d908d1fd3d95cedf2b952729995ce53234 (patch) | |
| tree | 80affacfae92a2a0cbf15c7e615845769125efca /hw/npu2-hw-procedures.c | |
| parent | 1c5417ec1898dbdd072495913d7fbc657e570e6f (diff) | |
| download | skiboot-a752f2d908d1fd3d95cedf2b952729995ce53234.zip skiboot-a752f2d908d1fd3d95cedf2b952729995ce53234.tar.gz skiboot-a752f2d908d1fd3d95cedf2b952729995ce53234.tar.bz2 | |
npu2: hw-procedures: Add check_credits procedure
As an immediate mitigator for a current hardware glitch, add a procedure
that can be used to validate NTL credit values. This will be called as a
safeguard to check that link training succeeded.
Assert that things are exactly as we expect, because if they aren't, the
system will experience a catastrophic failure shortly after the start of
link traffic.
Signed-off-by: Reza Arbab <arbab@linux.vnet.ibm.com>
Acked-by: Alistair Popple <alistair@popple.id.au>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Diffstat (limited to 'hw/npu2-hw-procedures.c')
| -rw-r--r-- | hw/npu2-hw-procedures.c | 39 |
1 files changed, 38 insertions, 1 deletions
diff --git a/hw/npu2-hw-procedures.c b/hw/npu2-hw-procedures.c index 1db171a..bb8534b 100644 --- a/hw/npu2-hw-procedures.c +++ b/hw/npu2-hw-procedures.c @@ -663,6 +663,41 @@ static uint32_t phy_rx_training_wait(struct npu2_dev *ndev) } DEFINE_PROCEDURE(phy_rx_training, phy_rx_training_wait); +static uint32_t check_credit(struct npu2_dev *ndev, uint64_t reg, + const char *reg_name, uint64_t expected) +{ + uint64_t val; + + val = npu2_read(ndev->npu, reg); + if (val == expected) + return 0; + + NPU2DEVERR(ndev, "%s: expected 0x%llx, read 0x%llx\n", + reg_name, expected, val); + + return 1; +} + +#define CHECK_CREDIT(ndev, reg, expected) \ + check_credit(ndev, reg(ndev), #reg, expected); + +static uint32_t check_credits(struct npu2_dev *ndev) +{ + int fail = 0; + + fail += CHECK_CREDIT(ndev, NPU2_NTL_CRED_HDR_CREDIT_RX, 0x0BE0BE0000000000ULL); + fail += CHECK_CREDIT(ndev, NPU2_NTL_RSP_HDR_CREDIT_RX, 0x0BE0BE0000000000ULL); + fail += CHECK_CREDIT(ndev, NPU2_NTL_CRED_DATA_CREDIT_RX, 0x1001000000000000ULL); + fail += CHECK_CREDIT(ndev, NPU2_NTL_RSP_DATA_CREDIT_RX, 0x1001000000000000ULL); + fail += CHECK_CREDIT(ndev, NPU2_NTL_DBD_HDR_CREDIT_RX, 0x0640640000000000ULL); + fail += CHECK_CREDIT(ndev, NPU2_NTL_ATSD_HDR_CREDIT_RX, 0x0200200000000000ULL); + + assert(!fail); + + return PROCEDURE_COMPLETE; +} +DEFINE_PROCEDURE(check_credits); + static struct procedure *npu_procedures[] = { &procedure_stop, &procedure_nop, @@ -678,7 +713,9 @@ static struct procedure *npu_procedures[] = { /* Place holders for pre-terminate and terminate procedures */ &procedure_nop, - &procedure_nop}; + &procedure_nop, + &procedure_check_credits +}; /* Run a procedure step(s) and return status */ static uint32_t get_procedure_status(struct npu2_dev *dev) |