linux-kernel - Re: [PATCH v1 2/2] platform/mellanox: mlxbf-pmc: Add support for clock

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Date: Wed, 31 Jan 2024 12:23:33 +0200 (EET)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Shravan Kumar Ramani <shravankr@...dia.com>
cc: Hans de Goede <hdegoede@...hat.com>, Vadim Pasternak <vadimp@...dia.com>, 
    David Thompson <davthompson@...dia.com>, 
    platform-driver-x86@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 2/2] platform/mellanox: mlxbf-pmc: Add support for
 clock_measure performance block

On Tue, 30 Jan 2024, Shravan Kumar Ramani wrote:

> The HW clock_measure counter info is passed to the driver from ACPI.
> Create a new sub-directory for clock_measure events and provide
> read access to the user. Writes are blocked since the fields are RO.
> 
> Signed-off-by: Shravan Kumar Ramani <shravankr@...dia.com>
> Reviewed-by: David Thompson <davthompson@...dia.com>
> Reviewed-by: Vadim Pasternak <vadimp@...dia.com>
> ---
>  drivers/platform/mellanox/mlxbf-pmc.c | 46 ++++++++++++++++++++++++---
>  1 file changed, 42 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/platform/mellanox/mlxbf-pmc.c b/drivers/platform/mellanox/mlxbf-pmc.c
> index 906dfa96f783..e1c0e2f04abb 100644
> --- a/drivers/platform/mellanox/mlxbf-pmc.c
> +++ b/drivers/platform/mellanox/mlxbf-pmc.c
> @@ -865,6 +865,37 @@ static const struct mlxbf_pmc_events mlxbf_pmc_llt_miss_events[] = {
>  	{75, "HISTOGRAM_HISTOGRAM_BIN9"},
>  };
>  
> +static const struct mlxbf_pmc_events mlxbf_pmc_clock_events[] = {
> +	{ 0x0, "FMON_CLK_LAST_COUNT_PLL_D1_INST0" },
> +	{ 0x4, "REFERENCE_WINDOW_WIDTH_PLL_D1_INST0" },
> +	{ 0x8, "FMON_CLK_LAST_COUNT_PLL_D1_INST1" },
> +	{ 0xc, "REFERENCE_WINDOW_WIDTH_PLL_D1_INST1" },
> +	{ 0x10, "FMON_CLK_LAST_COUNT_PLL_G1" },
> +	{ 0x14, "REFERENCE_WINDOW_WIDTH_PLL_G1" },
> +	{ 0x18, "FMON_CLK_LAST_COUNT_PLL_W1" },
> +	{ 0x1c, "REFERENCE_WINDOW_WIDTH_PLL_W1" },
> +	{ 0x20, "FMON_CLK_LAST_COUNT_PLL_T1" },
> +	{ 0x24, "REFERENCE_WINDOW_WIDTH_PLL_T1" },
> +	{ 0x28, "FMON_CLK_LAST_COUNT_PLL_A0" },
> +	{ 0x2c, "REFERENCE_WINDOW_WIDTH_PLL_A0" },
> +	{ 0x30, "FMON_CLK_LAST_COUNT_PLL_C0" },
> +	{ 0x34, "REFERENCE_WINDOW_WIDTH_PLL_C0" },
> +	{ 0x38, "FMON_CLK_LAST_COUNT_PLL_N1" },
> +	{ 0x3c, "REFERENCE_WINDOW_WIDTH_PLL_N1" },
> +	{ 0x40, "FMON_CLK_LAST_COUNT_PLL_I1" },
> +	{ 0x44, "REFERENCE_WINDOW_WIDTH_PLL_I1" },
> +	{ 0x48, "FMON_CLK_LAST_COUNT_PLL_R1" },
> +	{ 0x4c, "REFERENCE_WINDOW_WIDTH_PLL_R1" },
> +	{ 0x50, "FMON_CLK_LAST_COUNT_PLL_P1" },
> +	{ 0x54, "REFERENCE_WINDOW_WIDTH_PLL_P1" },
> +	{ 0x58, "FMON_CLK_LAST_COUNT_REF_100_INST0" },
> +	{ 0x5c, "REFERENCE_WINDOW_WIDTH_REF_100_INST0" },
> +	{ 0x60, "FMON_CLK_LAST_COUNT_REF_100_INST1" },
> +	{ 0x64, "REFERENCE_WINDOW_WIDTH_REF_100_INST1" },
> +	{ 0x68, "FMON_CLK_LAST_COUNT_REF_156" },
> +	{ 0x6c, "REFERENCE_WINDOW_WIDTH_REF_156" },
> +};
> +
>  static struct mlxbf_pmc_context *pmc;
>  
>  /* UUID used to probe ATF service. */
> @@ -1041,6 +1072,9 @@ static const struct mlxbf_pmc_events *mlxbf_pmc_event_list(const char *blk,
>  	} else if (strstr(blk, "llt")) {
>  		events = mlxbf_pmc_llt_events;
>  		*size = ARRAY_SIZE(mlxbf_pmc_llt_events);
> +	} else if (strstr(blk, "clock_measure")) {
> +		events = mlxbf_pmc_clock_events;
> +		*size = ARRAY_SIZE(mlxbf_pmc_clock_events);
>  	} else {
>  		events = NULL;
>  		*size = 0;
> @@ -1477,14 +1511,15 @@ static int mlxbf_pmc_read_event(int blk_num, uint32_t cnt_num, bool is_l3,
>  /* Method to read a register */
>  static int mlxbf_pmc_read_reg(int blk_num, uint32_t offset, uint64_t *result)
>  {
> -	uint32_t ecc_out;
> +	uint32_t reg;

While at it, change to u32.

-- 
 i.