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

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Message-ID: <accfd50c-cf70-1145-6776-e4030e7c37fc@intel.com>
Date:   Thu, 2 Apr 2020 09:42:31 -0700
From:   Dave Jiang <dave.jiang@...el.com>
To:     "leonid.ravich@...l.com" <leonid.ravich@...l.com>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>
Cc:     "lravich@...il.com" <lravich@...il.com>,
        Vinod Koul <vkoul@...nel.org>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Zavras, Alexios" <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" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] dmaengine: ioat: fixing chunk sizing macros
 dependency



On 4/2/2020 9:33 AM, leonid.ravich@...l.com wrote:
> From: Leonid Ravich <Leonid.Ravich@....com>
> 
> prepare for changing alloc size.
> 
> Acked-by: Dave Jiang <dave.jiang@...el.com>
> Signed-off-by: Leonid Ravich <Leonid.Ravich@....com>

Hi Leonid, I haven't actually acked this patch yet, pending your answer 
on if this has been tested on hardware. Thanks.

> ---
>   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;
>