linux-kernel - Re: [PATCH v3] dma: Trace API

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Message-ID: <3559cb54-b19a-4650-afc0-fcfb261dd876@linux.dev>
Date: Thu, 5 Sep 2024 12:59:50 -0400
From: Sean Anderson <sean.anderson@...ux.dev>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Christoph Hellwig <hch@....de>,
 Marek Szyprowski <m.szyprowski@...sung.com>,
 Robin Murphy <robin.murphy@....com>, iommu@...ts.linux.dev,
 linux-kernel@...r.kernel.org, Masami Hiramatsu <mhiramat@...nel.org>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH v3] dma: Trace API

On 9/3/24 20:53, Steven Rostedt wrote:
> On Tue, 3 Sep 2024 10:36:29 -0400
> Sean Anderson <sean.anderson@...ux.dev> wrote:
> 
>> This doesn't apply for arrays:
>> 
>> 	field:__data_loc u64[] addrs;	offset:12;	size:4;	signed:0;
>> 
>> Here the size is not for the data type but for the array. And so the
>> type is parsed by process_sizeof in src/event-parse.c.
> 
> Ah, I see what you are talking about:
> 
> +	TP_printk("%s dir=%s phys_addrs=%s attrs=%s",
> +		__get_str(device),
> +		decode_dma_data_direction(__entry->dir),
> +		__print_array(__get_dynamic_array(addrs),
> +			      __get_dynamic_array_len(addrs) /
> +				sizeof(unsigned long long), sizeof(unsigned long long)),
> +		decode_dma_attrs(__entry->attrs))
> 
> That part.
> 
> Yeah, the "sizeof()" parsing is somewhat of a hack. It would be trivial to
> add u64 and all the variants to that.
> 
> This should do. I could get it into the next minor version.
> 
> diff --git a/src/event-parse.c b/src/event-parse.c
> index ddeb3b9909c0..73563c8e9dea 100644
> --- a/src/event-parse.c
> +++ b/src/event-parse.c
> @@ -3571,6 +3571,23 @@ process_sizeof(struct tep_event *event, struct tep_print_arg *arg, char **tok)
>  			/* The token is the next token */
>  			token_has_paren = true;
>  		}
> +
> +	} else if (strcmp(token, "__u64") == 0 || strcmp(token, "u64") == 0 ||
> +		   strcmp(token, "__s64") == 0 || strcmp(token, "s64") == 0) {
> +		arg->atom.atom = strdup("8");
> +
> +	} else if (strcmp(token, "__u32") == 0 || strcmp(token, "u32") == 0 ||
> +		   strcmp(token, "__s32") == 0 || strcmp(token, "s32") == 0) {
> +		arg->atom.atom = strdup("4");
> +
> +	} else if (strcmp(token, "__u16") == 0 || strcmp(token, "u16") == 0 ||
> +		   strcmp(token, "__s16") == 0 || strcmp(token, "s16") == 0) {
> +		arg->atom.atom = strdup("2");
> +
> +	} else if (strcmp(token, "__u8") == 0 || strcmp(token, "u8") == 0 ||
> +		   strcmp(token, "__s8") == 0 || strcmp(token, "s8") == 0) {
> +		arg->atom.atom = strdup("1");
> +
>  	} else if (strcmp(token, "REC") == 0) {
>  
>  		free_token(token);

The above patch fixes the issue for me. Feel free to add

Tested-by: Sean Anderson <sean.anderson@...ux.dev>

when you send it.

--Sean