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| author | Nathan Lynch <nathanl@linux.ibm.com> | 2023-02-10 12:41:50 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-03-11 16:39:44 +0100 |
| commit | 9626f83a6ec72caceeaa22ffe400d746cf2ccfff (patch) | |
| tree | 17cc5cdf4bf2b5b6a6434661d868fd8547e0e35a /arch | |
| parent | 831a2d8de1d605be23f3afb0caa4690a5bfc3bfb (diff) | |
| download | linux-9626f83a6ec72caceeaa22ffe400d746cf2ccfff.tar.gz linux-9626f83a6ec72caceeaa22ffe400d746cf2ccfff.tar.bz2 linux-9626f83a6ec72caceeaa22ffe400d746cf2ccfff.zip | |
powerpc/perf/hv-24x7: add missing RTAS retry status handling
[ Upstream commit cc4b26eab1859fa1a70711872caaf6414809973f ]
The ibm,get-system-parameter RTAS function may return -2 or 990x,
which indicate that the caller should try again. read_24x7_sys_info()
ignores this, allowing transient failures in reporting processor
module information.
Move the RTAS call into a coventional rtas_busy_delay()-based loop,
along with the parsing of results on success.
Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Fixes: 8ba214267382 ("powerpc/hv-24x7: Add rtas call in hv-24x7 driver to get processor details")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20230125-b4-powerpc-rtas-queue-v3-2-26929c8cce78@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/perf/hv-24x7.c | 42 |
1 files changed, 18 insertions, 24 deletions
diff --git a/arch/powerpc/perf/hv-24x7.c b/arch/powerpc/perf/hv-24x7.c index 6e7e820508df..1cd2351d241e 100644 --- a/arch/powerpc/perf/hv-24x7.c +++ b/arch/powerpc/perf/hv-24x7.c @@ -79,9 +79,8 @@ static u32 phys_coresperchip; /* Physical cores per chip */ */ void read_24x7_sys_info(void) { - int call_status, len, ntypes; - - spin_lock(&rtas_data_buf_lock); + const s32 token = rtas_token("ibm,get-system-parameter"); + int call_status; /* * Making system parameter: chips and sockets and cores per chip @@ -91,32 +90,27 @@ void read_24x7_sys_info(void) phys_chipspersocket = 1; phys_coresperchip = 1; - call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1, - NULL, - PROCESSOR_MODULE_INFO, - __pa(rtas_data_buf), - RTAS_DATA_BUF_SIZE); + do { + spin_lock(&rtas_data_buf_lock); + call_status = rtas_call(token, 3, 1, NULL, PROCESSOR_MODULE_INFO, + __pa(rtas_data_buf), RTAS_DATA_BUF_SIZE); + if (call_status == 0) { + int ntypes = be16_to_cpup((__be16 *)&rtas_data_buf[2]); + int len = be16_to_cpup((__be16 *)&rtas_data_buf[0]); + + if (len >= 8 && ntypes != 0) { + phys_sockets = be16_to_cpup((__be16 *)&rtas_data_buf[4]); + phys_chipspersocket = be16_to_cpup((__be16 *)&rtas_data_buf[6]); + phys_coresperchip = be16_to_cpup((__be16 *)&rtas_data_buf[8]); + } + } + spin_unlock(&rtas_data_buf_lock); + } while (rtas_busy_delay(call_status)); if (call_status != 0) { pr_err("Error calling get-system-parameter %d\n", call_status); - } else { - len = be16_to_cpup((__be16 *)&rtas_data_buf[0]); - if (len < 8) - goto out; - - ntypes = be16_to_cpup((__be16 *)&rtas_data_buf[2]); - - if (!ntypes) - goto out; - - phys_sockets = be16_to_cpup((__be16 *)&rtas_data_buf[4]); - phys_chipspersocket = be16_to_cpup((__be16 *)&rtas_data_buf[6]); - phys_coresperchip = be16_to_cpup((__be16 *)&rtas_data_buf[8]); } - -out: - spin_unlock(&rtas_data_buf_lock); } /* Domains for which more than one result element are returned for each event. */ |