linux-kernel - Re: [PATCH v2 1/2] dmaengine: ioat: fixing chunk sizing macros dependency

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Message-ID: <20200415155224.GS72691@vkoul-mobl>
Date:   Wed, 15 Apr 2020 21:22:24 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     leonid.ravich@...l.com
Cc:     dmaengine@...r.kernel.org, lravich@...il.com,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alexios Zavras <alexios.zavras@...el.com>,
        "Alexander.Barabash@...l.com" <Alexander.Barabash@...l.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Jilayne Lovejoy <opensource@...ayne.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dmaengine: ioat: fixing chunk sizing macros
 dependency

On 02-04-20, 19:33, leonid.ravich@...l.com wrote:
> From: Leonid Ravich <Leonid.Ravich@....com>
> 
> prepare for changing alloc size.

This does not tell what the change is doing. A patch should describe the
change... pls explain the change is size here

> 
> Acked-by: Dave Jiang <dave.jiang@...el.com>
> Signed-off-by: Leonid Ravich <Leonid.Ravich@....com>
> ---
>  drivers/dma/ioat/dma.c  | 14 ++++++++------
>  drivers/dma/ioat/dma.h  | 10 ++++++----
>  drivers/dma/ioat/init.c |  2 +-
>  3 files changed, 15 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c
> index 18c011e..1e0e6c1 100644
> --- a/drivers/dma/ioat/dma.c
> +++ b/drivers/dma/ioat/dma.c
> @@ -332,8 +332,8 @@ static dma_cookie_t ioat_tx_submit_unlock(struct dma_async_tx_descriptor *tx)
>  	u8 *pos;
>  	off_t offs;
>  
> -	chunk = idx / IOAT_DESCS_PER_2M;
> -	idx &= (IOAT_DESCS_PER_2M - 1);
> +	chunk = idx / IOAT_DESCS_PER_CHUNK;
> +	idx &= (IOAT_DESCS_PER_CHUNK - 1);
>  	offs = idx * IOAT_DESC_SZ;
>  	pos = (u8 *)ioat_chan->descs[chunk].virt + offs;
>  	phys = ioat_chan->descs[chunk].hw + offs;
> @@ -370,7 +370,8 @@ struct ioat_ring_ent **
>  	if (!ring)
>  		return NULL;
>  
> -	ioat_chan->desc_chunks = chunks = (total_descs * IOAT_DESC_SZ) / SZ_2M;
> +	chunks = (total_descs * IOAT_DESC_SZ) / IOAT_CHUNK_SIZE;
> +	ioat_chan->desc_chunks = chunks;
>  
>  	for (i = 0; i < chunks; i++) {
>  		struct ioat_descs *descs = &ioat_chan->descs[i];
> @@ -382,8 +383,9 @@ struct ioat_ring_ent **
>  
>  			for (idx = 0; idx < i; idx++) {
>  				descs = &ioat_chan->descs[idx];
> -				dma_free_coherent(to_dev(ioat_chan), SZ_2M,
> -						  descs->virt, descs->hw);
> +				dma_free_coherent(to_dev(ioat_chan),
> +						IOAT_CHUNK_SIZE,
> +						descs->virt, descs->hw);
>  				descs->virt = NULL;
>  				descs->hw = 0;
>  			}
> @@ -404,7 +406,7 @@ struct ioat_ring_ent **
>  
>  			for (idx = 0; idx < ioat_chan->desc_chunks; idx++) {
>  				dma_free_coherent(to_dev(ioat_chan),
> -						  SZ_2M,
> +						  IOAT_CHUNK_SIZE,
>  						  ioat_chan->descs[idx].virt,
>  						  ioat_chan->descs[idx].hw);
>  				ioat_chan->descs[idx].virt = NULL;
> diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h
> index b8e8e0b..5216c6b 100644
> --- a/drivers/dma/ioat/dma.h
> +++ b/drivers/dma/ioat/dma.h
> @@ -81,6 +81,11 @@ struct ioatdma_device {
>  	u32 msixpba;
>  };
>  
> +#define IOAT_MAX_ORDER 16
> +#define IOAT_MAX_DESCS (1 << IOAT_MAX_ORDER)
> +#define IOAT_CHUNK_SIZE (SZ_2M)
> +#define IOAT_DESCS_PER_CHUNK (IOAT_CHUNK_SIZE / IOAT_DESC_SZ)
> +
>  struct ioat_descs {
>  	void *virt;
>  	dma_addr_t hw;
> @@ -128,7 +133,7 @@ struct ioatdma_chan {
>  	u16 produce;
>  	struct ioat_ring_ent **ring;
>  	spinlock_t prep_lock;
> -	struct ioat_descs descs[2];
> +	struct ioat_descs descs[IOAT_MAX_DESCS / IOAT_DESCS_PER_CHUNK];
>  	int desc_chunks;
>  	int intr_coalesce;
>  	int prev_intr_coalesce;
> @@ -301,9 +306,6 @@ static inline bool is_ioat_bug(unsigned long err)
>  	return !!err;
>  }
>  
> -#define IOAT_MAX_ORDER 16
> -#define IOAT_MAX_DESCS 65536
> -#define IOAT_DESCS_PER_2M 32768
>  
>  static inline u32 ioat_ring_size(struct ioatdma_chan *ioat_chan)
>  {
> diff --git a/drivers/dma/ioat/init.c b/drivers/dma/ioat/init.c
> index 60e9afb..58d1356 100644
> --- a/drivers/dma/ioat/init.c
> +++ b/drivers/dma/ioat/init.c
> @@ -651,7 +651,7 @@ static void ioat_free_chan_resources(struct dma_chan *c)
>  	}
>  
>  	for (i = 0; i < ioat_chan->desc_chunks; i++) {
> -		dma_free_coherent(to_dev(ioat_chan), SZ_2M,
> +		dma_free_coherent(to_dev(ioat_chan), IOAT_CHUNK_SIZE,
>  				  ioat_chan->descs[i].virt,
>  				  ioat_chan->descs[i].hw);
>  		ioat_chan->descs[i].virt = NULL;
> -- 
> 1.9.3

-- 
~Vinod