linux-kernel - Re: [PATCH 8/8] habanalabs: remove unnecessary checks

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Date:   Sat, 16 Nov 2019 12:21:34 +0200
From:   Oded Gabbay <oded.gabbay@...il.com>
To:     Omer Shpigelman <oshpigelman@...ana.ai>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 8/8] habanalabs: remove unnecessary checks

On Thu, Nov 14, 2019 at 8:24 PM Omer Shpigelman <oshpigelman@...ana.ai> wrote:
>
> Now that the VA block free list is not updated on context close in order
> to optimize this flow, no need in the sanity checks of the list contents
> as these will fail for sure.
> In addition, remove the "context closing with VA in use" print during hard
> reset as this situation is a side effect of the failure that caused the
> hard reset.
>
> Signed-off-by: Omer Shpigelman <oshpigelman@...ana.ai>
> ---
>  drivers/misc/habanalabs/memory.c | 40 +++++++-------------------------
>  1 file changed, 9 insertions(+), 31 deletions(-)
>
> diff --git a/drivers/misc/habanalabs/memory.c b/drivers/misc/habanalabs/memory.c
> index fa9462ee9d6f..b009ac4c62c0 100644
> --- a/drivers/misc/habanalabs/memory.c
> +++ b/drivers/misc/habanalabs/memory.c
> @@ -544,7 +544,6 @@ static u64 get_va_block(struct hl_device *hdev,
>                 /* calc the first possible aligned addr */
>                 valid_start = va_block->start;
>
> -
>                 if (valid_start & (page_size - 1)) {
>                         valid_start &= page_mask;
>                         valid_start += page_size;
> @@ -1589,43 +1588,16 @@ int hl_vm_ctx_init(struct hl_ctx *ctx)
>   * @hdev                : pointer to the habanalabs structure
>   * va_range             : pointer to virtual addresses range
>   *
> - * This function initializes the following:
> - * - Checks that the given range contains the whole initial range
> + * This function does the following:
>   * - Frees the virtual addresses block list and its lock
>   */
>  static void hl_va_range_fini(struct hl_device *hdev,
>                 struct hl_va_range *va_range)
>  {
> -       struct hl_vm_va_block *va_block;
> -
> -       if (list_empty(&va_range->list)) {
> -               dev_warn(hdev->dev,
> -                               "va list should not be empty on cleanup!\n");
> -               goto out;
> -       }
> -
> -       if (!list_is_singular(&va_range->list)) {
> -               dev_warn(hdev->dev,
> -                       "va list should not contain multiple blocks on cleanup!\n");
> -               goto free_va_list;
> -       }
> -
> -       va_block = list_first_entry(&va_range->list, typeof(*va_block), node);
> -
> -       if (va_block->start != va_range->start_addr ||
> -               va_block->end != va_range->end_addr) {
> -               dev_warn(hdev->dev,
> -                       "wrong va block on cleanup, from 0x%llx to 0x%llx\n",
> -                               va_block->start, va_block->end);
> -               goto free_va_list;
> -       }
> -
> -free_va_list:
>         mutex_lock(&va_range->lock);
>         clear_va_list_locked(hdev, &va_range->list);
>         mutex_unlock(&va_range->lock);
>
> -out:
>         mutex_destroy(&va_range->lock);
>  }
>
> @@ -1660,8 +1632,14 @@ void hl_vm_ctx_fini(struct hl_ctx *ctx)
>
>         hl_debugfs_remove_ctx_mem_hash(hdev, ctx);
>
> -       if (!hash_empty(ctx->mem_hash))
> -               dev_notice(hdev->dev, "ctx is freed while it has va in use\n");
> +       /*
> +        * Clearly something went wrong on hard reset so no point in printing
> +        * another side effect error
> +        */
> +       if (!hdev->hard_reset_pending && !hash_empty(ctx->mem_hash))
> +               dev_notice(hdev->dev,
> +                               "ctx %d is freed while it has va in use\n",
> +                               ctx->asid);
>
>         hash_for_each_safe(ctx->mem_hash, i, tmp_node, hnode, node) {
>                 dev_dbg(hdev->dev,
> --
> 2.17.1
>
This patch-set is:
Reviewed-by: Oded Gabbay <oded.gabbay@...il.com>