linux-kernel - Re: [PATCH] habanalabs: Make the Coresight timestamp perpetual

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Message-ID: <CAFCwf13Z7W+VLiRWcFT5aVf62N1VeL4P+kbFUM-To3ZafC+RWQ@mail.gmail.com>
Date:   Wed, 28 Aug 2019 10:53:34 +0300
From:   Oded Gabbay <oded.gabbay@...il.com>
To:     Tomer Tayar <ttayar@...ana.ai>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] habanalabs: Make the Coresight timestamp perpetual

On Tue, Aug 27, 2019 at 7:14 PM Tomer Tayar <ttayar@...ana.ai> wrote:
>
> The Coresight timestamp is enabled for a specific debug session using
> the HL_DEBUG_OP_TIMESTAMP opcode of the debug IOCTL.
> In order to have a perpetual timestamp that would be comparable between
> various debug sessions, this patch moves the timestamp enablement to be
> part of the HW initialization.
> The HL_DEBUG_OP_TIMESTAMP opcode turns to be deprecated and shouldn't be
> used.
>
> Signed-off-by: Tomer Tayar <ttayar@...ana.ai>
> ---
>  drivers/misc/habanalabs/goya/goya.c           | 23 +++++++++++++++++++
>  drivers/misc/habanalabs/goya/goya_coresight.c | 17 ++------------
>  include/uapi/misc/habanalabs.h                |  2 +-
>  3 files changed, 26 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/misc/habanalabs/goya/goya.c b/drivers/misc/habanalabs/goya/goya.c
> index de275cb3bb98..0dd0b4429fee 100644
> --- a/drivers/misc/habanalabs/goya/goya.c
> +++ b/drivers/misc/habanalabs/goya/goya.c
> @@ -2062,6 +2062,25 @@ static void goya_disable_msix(struct hl_device *hdev)
>         goya->hw_cap_initialized &= ~HW_CAP_MSIX;
>  }
>
> +static void goya_enable_timestamp(struct hl_device *hdev)
> +{
> +       /* Disable the timestamp counter */
> +       WREG32(mmPSOC_TIMESTAMP_BASE - CFG_BASE, 0);
> +
> +       /* Zero the lower/upper parts of the 64-bit counter */
> +       WREG32(mmPSOC_TIMESTAMP_BASE - CFG_BASE + 0xC, 0);
> +       WREG32(mmPSOC_TIMESTAMP_BASE - CFG_BASE + 0x8, 0);
> +
> +       /* Enable the counter */
> +       WREG32(mmPSOC_TIMESTAMP_BASE - CFG_BASE, 1);
> +}
> +
> +static void goya_disable_timestamp(struct hl_device *hdev)
> +{
> +       /* Disable the timestamp counter */
> +       WREG32(mmPSOC_TIMESTAMP_BASE - CFG_BASE, 0);
> +}
> +
>  static void goya_halt_engines(struct hl_device *hdev, bool hard_reset)
>  {
>         u32 wait_timeout_ms, cpu_timeout_ms;
> @@ -2102,6 +2121,8 @@ static void goya_halt_engines(struct hl_device *hdev, bool hard_reset)
>         goya_disable_external_queues(hdev);
>         goya_disable_internal_queues(hdev);
>
> +       goya_disable_timestamp(hdev);
> +
>         if (hard_reset) {
>                 goya_disable_msix(hdev);
>                 goya_mmu_remove_device_cpu_mappings(hdev);
> @@ -2504,6 +2525,8 @@ static int goya_hw_init(struct hl_device *hdev)
>
>         goya_init_tpc_qmans(hdev);
>
> +       goya_enable_timestamp(hdev);
> +
>         /* MSI-X must be enabled before CPU queues are initialized */
>         rc = goya_enable_msix(hdev);
>         if (rc)
> diff --git a/drivers/misc/habanalabs/goya/goya_coresight.c b/drivers/misc/habanalabs/goya/goya_coresight.c
> index 3d77b1c20336..b4d406af1bed 100644
> --- a/drivers/misc/habanalabs/goya/goya_coresight.c
> +++ b/drivers/misc/habanalabs/goya/goya_coresight.c
> @@ -636,24 +636,11 @@ static int goya_config_spmu(struct hl_device *hdev,
>         return 0;
>  }
>
> -static int goya_config_timestamp(struct hl_device *hdev,
> -               struct hl_debug_params *params)
> -{
> -       WREG32(mmPSOC_TIMESTAMP_BASE - CFG_BASE, 0);
> -       if (params->enable) {
> -               WREG32(mmPSOC_TIMESTAMP_BASE - CFG_BASE + 0xC, 0);
> -               WREG32(mmPSOC_TIMESTAMP_BASE - CFG_BASE + 0x8, 0);
> -               WREG32(mmPSOC_TIMESTAMP_BASE - CFG_BASE, 1);
> -       }
> -
> -       return 0;
> -}
> -
>  int goya_debug_coresight(struct hl_device *hdev, void *data)
>  {
>         struct hl_debug_params *params = data;
>         u32 val;
> -       int rc;
> +       int rc = 0;
>
>         switch (params->op) {
>         case HL_DEBUG_OP_STM:
> @@ -675,7 +662,7 @@ int goya_debug_coresight(struct hl_device *hdev, void *data)
>                 rc = goya_config_spmu(hdev, params);
>                 break;
>         case HL_DEBUG_OP_TIMESTAMP:
> -               rc = goya_config_timestamp(hdev, params);
> +               /* Do nothing as this opcode is deprecated */
>                 break;
>
>         default:
> diff --git a/include/uapi/misc/habanalabs.h b/include/uapi/misc/habanalabs.h
> index 6cf50177cd21..266bf85056d4 100644
> --- a/include/uapi/misc/habanalabs.h
> +++ b/include/uapi/misc/habanalabs.h
> @@ -451,7 +451,7 @@ struct hl_debug_params_spmu {
>  #define HL_DEBUG_OP_BMON       4
>  /* Opcode for SPMU component */
>  #define HL_DEBUG_OP_SPMU       5
> -/* Opcode for timestamp */
> +/* Opcode for timestamp (deprecated) */
>  #define HL_DEBUG_OP_TIMESTAMP  6
>  /* Opcode for setting the device into or out of debug mode. The enable
>   * variable should be 1 for enabling debug mode and 0 for disabling it
> --
> 2.17.1
>

This patch is:
Reviewed-by: Oded Gabbay <oded.gabbay@...il.com>
Applied to -next
Oded