From: Kamal Dasu <kdasu.kdev@gmail.com>
To: Kamal Dasu <kdasu.kdev@gmail.com>
Cc: Vignesh Raghavendra <vigneshr@ti.com>,
Boris Brezillon <bbrezillon@kernel.org>,
Richard Weinberger <richard@nod.at>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Frieder Schrempf <frieder.schrempf@kontron.de>,
Marek Vasut <marek.vasut@gmail.com>,
MTD Maling List <linux-mtd@lists.infradead.org>,
Miquel Raynal <miquel.raynal@bootlin.com>,
bcm-kernel-feedback-list@broadcom.com,
Brian Norris <computersforpeace@gmail.com>,
David Woodhouse <dwmw2@infradead.org>
Subject: Re: [PATCH 2/2] mtd: rawnand: use bounce buffer when vmalloced data buf detected
Date: Mon, 30 Sep 2019 12:01:28 -0400 [thread overview]
Message-ID: <CAC=U0a1qvKO+t_62df_JcQBETAuNq0pwRkAb-Ofi3ski2rfdEQ@mail.gmail.com> (raw)
In-Reply-To: <20190906194719.15761-2-kdasu.kdev@gmail.com>
Does anyone have any comments on this patch ?.
Kamal
On Fri, Sep 6, 2019 at 3:49 PM Kamal Dasu <kdasu.kdev@gmail.com> wrote:
>
> For controller drivers that use DMA and set NAND_USE_BOUNCE_BUFFER
> option use data buffers that are not vmalloced, aligned and have
> valid virtual address to be able to do DMA transfers. This change
> adds additional check and makes use of data buffer allocated
> in nand_base driver when it is passed a vmalloced data buffer for
> DMA transfers.
>
> Signed-off-by: Kamal Dasu <kdasu.kdev@gmail.com>
> ---
> drivers/mtd/nand/raw/nand_base.c | 14 ++++++++------
> 1 file changed, 8 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
> index 91f046d4d452..46f6965a896a 100644
> --- a/drivers/mtd/nand/raw/nand_base.c
> +++ b/drivers/mtd/nand/raw/nand_base.c
> @@ -45,6 +45,12 @@
>
> #include "internals.h"
>
> +static int nand_need_bounce_buf(const void *buf, struct nand_chip *chip)
> +{
> + return !virt_addr_valid(buf) || is_vmalloc_addr(buf) ||
> + !IS_ALIGNED((unsigned long)buf, chip->buf_align);
> +}
> +
> /* Define default oob placement schemes for large and small page devices */
> static int nand_ooblayout_ecc_sp(struct mtd_info *mtd, int section,
> struct mtd_oob_region *oobregion)
> @@ -3183,9 +3189,7 @@ static int nand_do_read_ops(struct nand_chip *chip, loff_t from,
> if (!aligned)
> use_bufpoi = 1;
> else if (chip->options & NAND_USE_BOUNCE_BUFFER)
> - use_bufpoi = !virt_addr_valid(buf) ||
> - !IS_ALIGNED((unsigned long)buf,
> - chip->buf_align);
> + use_bufpoi = nand_need_bounce_buf(buf, chip);
> else
> use_bufpoi = 0;
>
> @@ -4009,9 +4013,7 @@ static int nand_do_write_ops(struct nand_chip *chip, loff_t to,
> if (part_pagewr)
> use_bufpoi = 1;
> else if (chip->options & NAND_USE_BOUNCE_BUFFER)
> - use_bufpoi = !virt_addr_valid(buf) ||
> - !IS_ALIGNED((unsigned long)buf,
> - chip->buf_align);
> + use_bufpoi = nand_need_bounce_buf(buf, chip);
> else
> use_bufpoi = 0;
>
> --
> 2.17.1
>
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http://lists.infradead.org/mailman/listinfo/linux-mtd/
next prev parent reply other threads:[~2019-09-30 16:01 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-06 19:47 [PATCH 1/2] mtd: nand: brcmnand: Add support for flash-dma v0 Kamal Dasu
2019-09-06 19:47 ` [PATCH 2/2] mtd: rawnand: use bounce buffer when vmalloced data buf detected Kamal Dasu
2019-09-30 16:01 ` Kamal Dasu [this message]
2019-09-30 16:24 ` Boris Brezillon
2019-09-30 16:33 ` Kamal Dasu
2019-09-30 19:39 ` Richard Weinberger
2019-10-01 17:07 ` Kamal Dasu
2019-10-04 16:04 ` [PATCH 1/2] mtd: nand: brcmnand: Add support for flash-dma v0 Miquel Raynal
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