Date:   Thu, 20 Jan 2022 12:17:13 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Hector Martin <marcan@...can.st>
Cc:     Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Arend van Spriel <aspriel@...il.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Chi-hsien Lin <chi-hsien.lin@...ineon.com>,
        Wright Feng <wright.feng@...ineon.com>,
        Dmitry Osipenko <digetx@...il.com>,
        Sven Peter <sven@...npeter.dev>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Mark Kettenis <kettenis@...nbsd.org>,
        Rafał Miłecki <zajec5@...il.com>,
        Pieter-Paul Giesberts <pieter-paul.giesberts@...adcom.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Hans de Goede <hdegoede@...hat.com>,
        "John W. Linville" <linville@...driver.com>,
        "brian m. carlson" <sandals@...stytoothpaste.net>,
        "open list:TI WILINK WIRELES..." <linux-wireless@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        "open list:BROADCOM BRCM80211 IEEE802.11n WIRELESS DRIVER" 
        <brcm80211-dev-list.pdl@...adcom.com>,
        SHA-cyfmac-dev-list@...ineon.com
Subject: Re: [PATCH v3 5/9] brcmfmac: pcie: Replace brcmf_pcie_copy_mem_todev
 with memcpy_toio

On Mon, Jan 17, 2022 at 4:31 PM Hector Martin <marcan@...can.st> wrote:
>
> The alignment check was wrong (e.g. & 4 instead of & 3), and the logic
> was also inefficient if the length was not a multiple of 4, since it
> would needlessly fall back to copying the entire buffer bytewise.
>
> We already have a perfectly good memcpy_toio function, so just call that
> instead of rolling our own copy logic here. brcmf_pcie_init_ringbuffers
> was already using it anyway.

My gosh, what a nice fix!
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

> Fixes: 9e37f045d5e7 ("brcmfmac: Adding PCIe bus layer support.")
> Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
> Signed-off-by: Hector Martin <marcan@...can.st>
> ---
>  .../broadcom/brcm80211/brcmfmac/pcie.c        | 48 ++-----------------
>  1 file changed, 4 insertions(+), 44 deletions(-)
>
> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
> index b1ae6c41013f..c25f48db1f60 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
> @@ -12,6 +12,7 @@
>  #include <linux/interrupt.h>
>  #include <linux/bcma/bcma.h>
>  #include <linux/sched.h>
> +#include <linux/io.h>
>  #include <asm/unaligned.h>
>
>  #include <soc.h>
> @@ -454,47 +455,6 @@ brcmf_pcie_write_ram32(struct brcmf_pciedev_info *devinfo, u32 mem_offset,
>  }
>
>
> -static void
> -brcmf_pcie_copy_mem_todev(struct brcmf_pciedev_info *devinfo, u32 mem_offset,
> -                         void *srcaddr, u32 len)
> -{
> -       void __iomem *address = devinfo->tcm + mem_offset;
> -       __le32 *src32;
> -       __le16 *src16;
> -       u8 *src8;
> -
> -       if (((ulong)address & 4) || ((ulong)srcaddr & 4) || (len & 4)) {
> -               if (((ulong)address & 2) || ((ulong)srcaddr & 2) || (len & 2)) {
> -                       src8 = (u8 *)srcaddr;
> -                       while (len) {
> -                               iowrite8(*src8, address);
> -                               address++;
> -                               src8++;
> -                               len--;
> -                       }
> -               } else {
> -                       len = len / 2;
> -                       src16 = (__le16 *)srcaddr;
> -                       while (len) {
> -                               iowrite16(le16_to_cpu(*src16), address);
> -                               address += 2;
> -                               src16++;
> -                               len--;
> -                       }
> -               }
> -       } else {
> -               len = len / 4;
> -               src32 = (__le32 *)srcaddr;
> -               while (len) {
> -                       iowrite32(le32_to_cpu(*src32), address);
> -                       address += 4;
> -                       src32++;
> -                       len--;
> -               }
> -       }
> -}
> -
> -
>  static void
>  brcmf_pcie_copy_dev_tomem(struct brcmf_pciedev_info *devinfo, u32 mem_offset,
>                           void *dstaddr, u32 len)
> @@ -1570,8 +1530,8 @@ static int brcmf_pcie_download_fw_nvram(struct brcmf_pciedev_info *devinfo,
>                 return err;
>
>         brcmf_dbg(PCIE, "Download FW %s\n", devinfo->fw_name);
> -       brcmf_pcie_copy_mem_todev(devinfo, devinfo->ci->rambase,
> -                                 (void *)fw->data, fw->size);
> +       memcpy_toio(devinfo->tcm + devinfo->ci->rambase,
> +                   (void *)fw->data, fw->size);
>
>         resetintr = get_unaligned_le32(fw->data);
>         release_firmware(fw);
> @@ -1585,7 +1545,7 @@ static int brcmf_pcie_download_fw_nvram(struct brcmf_pciedev_info *devinfo,
>                 brcmf_dbg(PCIE, "Download NVRAM %s\n", devinfo->nvram_name);
>                 address = devinfo->ci->rambase + devinfo->ci->ramsize -
>                           nvram_len;
> -               brcmf_pcie_copy_mem_todev(devinfo, address, nvram, nvram_len);
> +               memcpy_toio(devinfo->tcm + address, nvram, nvram_len);
>                 brcmf_fw_nvram_free(nvram);
>         } else {
>                 brcmf_dbg(PCIE, "No matching NVRAM file found %s\n",
> --
> 2.33.0
>


-- 
With Best Regards,
Andy Shevchenko

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