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| author | Alexey Kardashevskiy <aik@ozlabs.ru> | 2019-04-29 19:12:27 +1000 |
|---|---|---|
| committer | Stewart Smith <stewart@linux.ibm.com> | 2019-05-02 09:57:15 +1000 |
| commit | 0f492a92590850af6360bdcc93e2047b285d41c7 (patch) | |
| tree | f9f79e96583903bc23546280c6457f62560c6b5c /include/npu2-regs.h | |
| parent | 44afdc1afb1fe17ad7ae6758279f856a464cb922 (diff) | |
| download | skiboot-0f492a92590850af6360bdcc93e2047b285d41c7.zip skiboot-0f492a92590850af6360bdcc93e2047b285d41c7.tar.gz skiboot-0f492a92590850af6360bdcc93e2047b285d41c7.tar.bz2 | |
npu2: Disable Probe-to-Invalid-Return-Modified-or-Owned snarfing by default
V100 GPUs are known to violate NVLink2 protocol in some cases (one is when
memory was accessed by the CPU and they by GPU using so called block
linear mapping) and issue double probes to NPU which can cope with this
problem only if CONFIG_ENABLE_SNARF_CPM ("disable/enable Probe.I.MO
snarfing a cp_m") is not set in the CQ_SM Misc Config register #0.
If the bit is set (which is the case today), NPU issues the machine
check stop.
The snarfing feature is designed to detect 2 probes in flight and combine
them into one.
This adds a new "opal-npu2-snarf-cpm" nvram variable which controls
CONFIG_ENABLE_SNARF_CPM for all NVLinks to prevent the machine check
stop from happening.
This disables snarfing by default as otherwise a broken GPU driver can
crash the entire box even when a GPU is passed through to a guest.
This provides a dial to allow regression tests (might be useful for
a bare metal). To enable snarfing, the user needs to run:
sudo nvram -p ibm,skiboot --update-config opal-npu2-snarf-cpm=enable
and reboot the host system.
While at this, define macros for register names as well to avoid touching
same lines over and over again.
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Stewart Smith <stewart@linux.ibm.com>
Diffstat (limited to 'include/npu2-regs.h')
| -rw-r--r-- | include/npu2-regs.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/npu2-regs.h b/include/npu2-regs.h index ba10b8e..61e8ea8 100644 --- a/include/npu2-regs.h +++ b/include/npu2-regs.h @@ -791,4 +791,18 @@ void npu2_scom_write(uint64_t gcid, uint64_t scom_base, #define L3_PRD_PURGE_TTYPE_MASK PPC_BIT(1) | PPC_BIT(2) | PPC_BIT(3) | PPC_BIT(4) #define L3_FULL_PURGE 0x0 +/* Config registers for NPU2 */ +#define NPU_STCK0_CS_SM0_MISC_CONFIG0 0x5011000 +#define NPU_STCK0_CS_SM1_MISC_CONFIG0 0x5011030 +#define NPU_STCK0_CS_SM2_MISC_CONFIG0 0x5011060 +#define NPU_STCK0_CS_SM3_MISC_CONFIG0 0x5011090 +#define NPU_STCK1_CS_SM0_MISC_CONFIG0 0x5011200 +#define NPU_STCK1_CS_SM1_MISC_CONFIG0 0x5011230 +#define NPU_STCK1_CS_SM2_MISC_CONFIG0 0x5011260 +#define NPU_STCK1_CS_SM3_MISC_CONFIG0 0x5011290 +#define NPU_STCK2_CS_SM0_MISC_CONFIG0 0x5011400 +#define NPU_STCK2_CS_SM1_MISC_CONFIG0 0x5011430 +#define NPU_STCK2_CS_SM2_MISC_CONFIG0 0x5011460 +#define NPU_STCK2_CS_SM3_MISC_CONFIG0 0x5011490 + #endif /* __NPU2_REGS_H */ |