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SubjectRe: [PATCH 4/5] perf: arm_spe: Decode memory tagging properties
On Tue, Sep 22, 2020 at 11:12:24AM +0100, Andre Przywara wrote:
> When SPE records a physical address, it can additionally tag the event
> with information from the Memory Tagging architecture extension.
>
> Decode the two additional fields in the SPE event payload.
>
> Signed-off-by: Andre Przywara <andre.przywara@arm.com>
> ---
> .../util/arm-spe-decoder/arm-spe-pkt-decoder.c | 17 ++++++++++++-----
> 1 file changed, 12 insertions(+), 5 deletions(-)
>
> diff --git a/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c b/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c
> index 943e4155b246..a033f34846a6 100644
> --- a/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c
> +++ b/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c
> @@ -8,13 +8,14 @@
> #include <string.h>
> #include <endian.h>
> #include <byteswap.h>
> +#include <linux/bits.h>
>
> #include "arm-spe-pkt-decoder.h"
>
> -#define BIT(n) (1ULL << (n))
> -
> #define NS_FLAG BIT(63)
> #define EL_FLAG (BIT(62) | BIT(61))
> +#define CH_FLAG BIT(62)
> +#define PAT_FLAG GENMASK_ULL(59, 56)
>
> #define SPE_HEADER0_PAD 0x0
> #define SPE_HEADER0_END 0x1
> @@ -447,10 +448,16 @@ int arm_spe_pkt_desc(const struct arm_spe_pkt *packet, char *buf,
> return snprintf(buf, buf_len, "%s 0x%llx el%d ns=%d",
> (idx == 1) ? "TGT" : "PC", payload, el, ns);
> case 2: return snprintf(buf, buf_len, "VA 0x%llx", payload);
> - case 3: ns = !!(packet->payload & NS_FLAG);
> + case 3: {
> + int ch = !!(packet->payload & CH_FLAG);
> + int pat = (packet->payload & PAT_FLAG) >> 56;
> +
> + ns = !!(packet->payload & NS_FLAG);
> payload &= ~(0xffULL << 56);
> - return snprintf(buf, buf_len, "PA 0x%llx ns=%d",
> - payload, ns);
> + return snprintf(buf, buf_len,
> + "PA 0x%llx ns=%d ch=%d, pat=%x",
> + payload, ns, ch, pat);
> + }

Reviewed-by: Leo Yan <leo.yan@linaro.org>

> default: return 0;
> }
> case ARM_SPE_CONTEXT:
> --
> 2.17.1
>

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