linux-kernel - Re: [PATCH 06/14] fsi: master-gpio: Add more tracepoints

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Message-ID: <CACPK8XfZPCiCPeNL5-TpPMcHrA_fyiLu=5pArSxBXd6wT8jkFA@mail.gmail.com>
Date:   Thu, 28 Jun 2018 13:41:34 +0930
From:   Joel Stanley <joel@....id.au>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:     linux-aspeed@...ts.ozlabs.org,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        devicetree <devicetree@...r.kernel.org>,
        Andrew Jeffery <andrew@...id.au>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 06/14] fsi: master-gpio: Add more tracepoints

On 27 June 2018 at 08:55, Benjamin Herrenschmidt
<benh@...nel.crashing.org> wrote:
> This adds a few more tracepoints that have proven useful when
> debugging issues with the FSI bus.
>
> Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>

Reviewed-by: Joel Stanley <joel@....id.au>

> ---
>  drivers/fsi/fsi-master-gpio.c          | 16 ++++---
>  include/trace/events/fsi_master_gpio.h | 59 ++++++++++++++++++++++++++
>  2 files changed, 69 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/fsi/fsi-master-gpio.c b/drivers/fsi/fsi-master-gpio.c
> index 48e0e65b2982..a00a85aa6d56 100644
> --- a/drivers/fsi/fsi-master-gpio.c
> +++ b/drivers/fsi/fsi-master-gpio.c
> @@ -130,10 +130,17 @@ static void set_sda_output(struct fsi_master_gpio *master, int value)
>
>  static void clock_zeros(struct fsi_master_gpio *master, int count)
>  {
> +       trace_fsi_master_gpio_clock_zeros(master, count);
>         set_sda_output(master, 1);
>         clock_toggle(master, count);
>  }
>
> +static void echo_delay(struct fsi_master_gpio *master)
> +{
> +       clock_zeros(master, master->t_echo_delay);
> +}

This doesn't look like it belongs in this patch.

You've just moved it up. Not worth a re-spin.

> +
> +
>  static void serial_in(struct fsi_master_gpio *master, struct fsi_gpio_msg *msg,
>                         uint8_t num_bits)
>  {
> @@ -279,16 +286,19 @@ static void build_ar_command(struct fsi_master_gpio *master,
>                 addr_bits = 2;
>                 opcode_bits = 2;
>                 opcode = FSI_GPIO_CMD_SAME_AR;
> +               trace_fsi_master_gpio_cmd_same_addr(master);
>
>         } else if (check_relative_address(master, id, addr, &rel_addr)) {
>                 /* 8 bits plus sign */
>                 addr_bits = 9;
>                 addr = rel_addr;
>                 opcode = FSI_GPIO_CMD_REL_AR;
> +               trace_fsi_master_gpio_cmd_rel_addr(master, rel_addr);
>
>         } else {
>                 addr_bits = 21;
>                 opcode = FSI_GPIO_CMD_ABS_AR;
> +               trace_fsi_master_gpio_cmd_abs_addr(master, addr);
>         }
>
>         /*
> @@ -337,12 +347,6 @@ static void build_epoll_command(struct fsi_gpio_msg *cmd, uint8_t slave_id)
>         msg_push_crc(cmd);
>  }
>
> -static void echo_delay(struct fsi_master_gpio *master)
> -{
> -       set_sda_output(master, 1);
> -       clock_toggle(master, master->t_echo_delay);
> -}
> -
>  static void build_term_command(struct fsi_gpio_msg *cmd, uint8_t slave_id)
>  {
>         cmd->bits = 0;