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perf arm-spe: Refactor payload size calculation

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This patch defines macro to extract "sz" field from header, and renames
the function payloadlen() to arm_spe_payload_len().

Signed-off-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Link: https://lore.kernel.org/r/20201111071149.815-4-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Leo Yan 2020-11-11 15:11:30 +08:00 committed by Arnaldo Carvalho de Melo
parent 903b659436
commit b2ded2e2e2
1 changed files with 9 additions and 9 deletions
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18
tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c
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@ -69,22 +69,22 @@ const char *arm_spe_pkt_name(enum arm_spe_pkt_type type)
return arm_spe_packet_name[type];
}
/* return ARM SPE payload size from its encoding,
* which is in bits 5:4 of the byte.
* 00 : byte
* 01 : halfword (2)
* 10 : word (4)
* 11 : doubleword (8)
/*
* Extracts the field "sz" from header bits and converts to bytes:
* 00 : byte (1)
* 01 : halfword (2)
* 10 : word (4)
* 11 : doubleword (8)
*/
static int payloadlen(unsigned char byte)
static unsigned int arm_spe_payload_len(unsigned char hdr)
{
return 1 << ((byte & 0x30) >> 4);
return 1U << ((hdr & GENMASK_ULL(5, 4)) >> 4);
}
static int arm_spe_get_payload(const unsigned char *buf, size_t len,
struct arm_spe_pkt *packet)
{
size_t payload_len = payloadlen(buf[0]);
size_t payload_len = arm_spe_payload_len(buf[0]);
if (len < 1 + payload_len)
return ARM_SPE_NEED_MORE_BYTES;