linux-kernel - Re: [PATCH 3/5] lightnvm: add fpg_size and pfpg_size to struct nvm

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Date:	Tue, 05 Apr 2016 17:09:32 +0200
From:	Johannes Thumshirn <jthumshirn@...e.de>
To:	Matias Bjørling <m@...rling.me>
Cc:	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-block-owner@...r.kernel.org
Subject: Re: [PATCH 3/5] lightnvm: add fpg_size and pfpg_size to struct
 nvm_dev

On 2016-04-05 16:55, Matias Bjørling wrote:
> The flash page size (fpg) and size across planes (pfpg) are convenient
> to know when allocating buffer sizes. This has previously been a
> calculated in various places. Replace with the pre-calculated values.
> 
> Signed-off-by: Matias Bjørling <m@...rling.me>
> ---
>  drivers/lightnvm/core.c   |  2 ++
>  drivers/lightnvm/sysblk.c | 17 +++++++----------
>  include/linux/lightnvm.h  |  2 ++
>  3 files changed, 11 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
> index f4e04a5..652b8c7 100644
> --- a/drivers/lightnvm/core.c
> +++ b/drivers/lightnvm/core.c
> @@ -476,6 +476,8 @@ static int nvm_core_init(struct nvm_dev *dev)
>  	dev->pgs_per_blk = grp->num_pg;
>  	dev->blks_per_lun = grp->num_blk;
>  	dev->nr_planes = grp->num_pln;
> +	dev->fpg_size = grp->fpg_sz;
> +	dev->pfpg_size = grp->fpg_sz * grp->num_pln;
>  	dev->sec_size = grp->csecs;
>  	dev->oob_size = grp->sos;
>  	dev->sec_per_pg = grp->fpg_sz / grp->csecs;
> diff --git a/drivers/lightnvm/sysblk.c b/drivers/lightnvm/sysblk.c
> index 321de1f..8835d89 100644
> --- a/drivers/lightnvm/sysblk.c
> +++ b/drivers/lightnvm/sysblk.c
> @@ -154,13 +154,12 @@ static int nvm_scan_block(struct nvm_dev *dev,
> struct ppa_addr *ppa,
>  						struct nvm_system_block *sblk)
>  {
>  	struct nvm_system_block *cur;
> -	int pg, cursz, ret, found = 0;
> +	int pg, ret, found = 0;
> 
>  	/* the full buffer for a flash page is allocated. Only the first of 
> it
>  	 * contains the system block information
>  	 */
> -	cursz = dev->sec_size * dev->sec_per_pg * dev->nr_planes;
> -	cur = kmalloc(cursz, GFP_KERNEL);
> +	cur = kmalloc(dev->pfpg_size, GFP_KERNEL);
>  	if (!cur)
>  		return -ENOMEM;
> 
> @@ -169,7 +168,7 @@ static int nvm_scan_block(struct nvm_dev *dev,
> struct ppa_addr *ppa,
>  		ppa->g.pg = ppa_to_slc(dev, pg);
> 
>  		ret = nvm_submit_ppa(dev, ppa, 1, NVM_OP_PREAD, NVM_IO_SLC_MODE,
> -								cur, cursz);
> +							cur, dev->pfpg_size);
>  		if (ret) {
>  			if (ret == NVM_RSP_ERR_EMPTYPAGE) {
>  				pr_debug("nvm: sysblk scan empty ppa (%u %u %u %u)\n",
> @@ -272,14 +271,12 @@ static int nvm_write_and_verify(struct nvm_dev
> *dev, struct nvm_sb_info *info,
>  {
>  	struct nvm_system_block nvmsb;
>  	void *buf;
> -	int i, sect, ret, bufsz;
> +	int i, sect, ret;
>  	struct ppa_addr *ppas;
> 
>  	nvm_cpu_to_sysblk(&nvmsb, info);
> 
> -	/* buffer for flash page */
> -	bufsz = dev->sec_size * dev->sec_per_pg * dev->nr_planes;
> -	buf = kzalloc(bufsz, GFP_KERNEL);
> +	buf = kzalloc(dev->pfpg_size, GFP_KERNEL);
>  	if (!buf)
>  		return -ENOMEM;
>  	memcpy(buf, &nvmsb, sizeof(struct nvm_system_block));
> @@ -309,7 +306,7 @@ static int nvm_write_and_verify(struct nvm_dev
> *dev, struct nvm_sb_info *info,
>  		}
> 
>  		ret = nvm_submit_ppa(dev, ppas, dev->sec_per_pg, NVM_OP_PWRITE,
> -						NVM_IO_SLC_MODE, buf, bufsz);
> +					NVM_IO_SLC_MODE, buf, dev->pfpg_size);
>  		if (ret) {
>  			pr_err("nvm: sysblk failed program (%u %u %u)\n",
>  							ppas[0].g.ch,
> @@ -319,7 +316,7 @@ static int nvm_write_and_verify(struct nvm_dev
> *dev, struct nvm_sb_info *info,
>  		}
> 
>  		ret = nvm_submit_ppa(dev, ppas, dev->sec_per_pg, NVM_OP_PREAD,
> -						NVM_IO_SLC_MODE, buf, bufsz);
> +					NVM_IO_SLC_MODE, buf, dev->pfpg_size);
>  		if (ret) {
>  			pr_err("nvm: sysblk failed read (%u %u %u)\n",
>  							ppas[0].g.ch,
> diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
> index 38814e2..f7c607f 100644
> --- a/include/linux/lightnvm.h
> +++ b/include/linux/lightnvm.h
> @@ -323,6 +323,8 @@ struct nvm_dev {
>  	int sec_per_pg; /* only sectors for a single page */
>  	int pgs_per_blk;
>  	int blks_per_lun;
> +	int fpg_size;
> +	int pfpg_size; /* size of buffer if all pages are to be read */
>  	int sec_size;
>  	int oob_size;
>  	int mccap;

Reviewed-by: Johannes Thumshirn <jthumshirn@...e.de>