linux-kernel - Re: [PATCH v3] mmc : general purpose partition support.

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Date:	Fri, 30 Sep 2011 10:32:23 +0900
From:	NamJae Jeon <linkinjeon@...il.com>
To:	Andrei Warkentin <awarkentin@...are.com>
Cc:	linux-kernel@...r.kernel.org,
	adrian hunter <adrian.hunter@...el.com>,
	linus walleij <linus.walleij@...aro.org>,
	james p freyensee <james_p_freyensee@...ux.intel.com>,
	sebras@...il.com, Ulf Hansson <Ulf.Hansson@...ricsson.com>,
	stefan xk nilsson <stefan.xk.nilsson@...ricsson.com>,
	per forlin <per.forlin@...ricsson.com>,
	johan rudholm <johan.rudholm@...ricsson.com>, cjb@...top.org,
	linux-mmc@...r.kernel.org
Subject: Re: [PATCH v3] mmc : general purpose partition support.

2011/9/30 Andrei Warkentin <awarkentin@...are.com>:
> Namjae,
>
> ----- Original Message -----
>> From: "Namjae Jeon" <linkinjeon@...il.com>
>> To: cjb@...top.org, linux-mmc@...r.kernel.org
>> Cc: linux-kernel@...r.kernel.org, awarkentin@...are.com, "adrian hunter" <adrian.hunter@...el.com>, "linus walleij"
>> <linus.walleij@...aro.org>, "james p freyensee" <james_p_freyensee@...ux.intel.com>, sebras@...il.com, "Ulf Hansson"
>> <Ulf.Hansson@...ricsson.com>, "stefan xk nilsson" <stefan.xk.nilsson@...ricsson.com>, "per forlin"
>> <per.forlin@...ricsson.com>, "johan rudholm" <johan.rudholm@...ricsson.com>, "Namjae Jeon" <linkinjeon@...il.com>
>> Sent: Thursday, September 29, 2011 11:17:11 AM
>> Subject: [PATCH v3] mmc : general purpose partition support.
>>
>> It allows gerneral purpose partitions in MMC Device.
>> And I try to simpliy make mmc_blk_alloc_parts using mmc_part
>> structure suggested by Andrei Warkentin.
>> After patching, we can see general purpose partitions like this.
>> > cat /proc/partitions
>>               179 0 847872 mmcblk0
>>               179 192 4096 mmcblk0gp3
>>               179 160 4096 mmcblk0gp2
>>               179 128 4096 mmcblk0gp1
>>               179 96  1052672 mmcblk0gp0
>>               179 64  1024 mmcblk0boot1
>>               179 32  1024 mmcblk0boot0
>>
>> Signed-off-by: Namjae Jeon <linkinjeon@...il.com>
>
>> +      for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
>> +             if (card->boot_part[idx].size) {
>> +                     ret = mmc_blk_alloc_part(card, md,
>> +                             card->boot_part[idx].cookie,
>> +                             card->boot_part[idx].size >> 9,
>> +                             card->boot_part[idx].force_ro,
>> +                             card->boot_part[idx].name);
>> +                     if (ret)
>> +                             return ret;
>> +             }
>> +     }
>> +
>> +     for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) {
>> +             if (card->gp_part[idx].size) {
>> +                     ret = mmc_blk_alloc_part(card, md,
>> +                             card->gp_part[idx].cookie,
>> +                             card->gp_part[idx].size >> 9,
>> +                             card->gp_part[idx].force_ro,
>> +                             card->gp_part[idx].name);
>> +                     if (ret)
>> +                             return ret;
>
> You were on a better track before. Why does the block drivre need to know about the partition types?
> You should parse one array.
>
>> -             card->ext_csd.boot_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
>> +             if (ext_csd[EXT_CSD_BOOT_MULT]) {
>> +                     part_cfg = EXT_CSD_PART_CONFIG_ACC_BOOT0;
>> +                     for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
>> +                             card->boot_part[idx].size =
>> +                                     ext_csd[EXT_CSD_BOOT_MULT] << 17;
>> +                             card->boot_part[idx].cookie = part_cfg++;
>> +                             sprintf(card->boot_part[idx].name, "boot%d",
>> +                                     idx);
>> +                             card->boot_part[idx].force_ro = true;
>> +                     }
>> +             }
>>       }
>>
>
> My earlier comment still stands - make your code look something like -
>
> if (ext_csd[EXT_CSD_BOOT_MULT]) {
>        part_cfg = EXT_CSD_PART_CONFIG_ACC_BOOT0;
>        for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
>                mmc_part_add(card, size, part_cfg++, "boot%d", part_cfg++,
>                                "boot%d", idx, true)
> }
>
>> +     struct mmc_part boot_part[MMC_NUM_BOOT_PARTITION];      /* mmc boot
>> partitions */
>> +     struct mmc_part gp_part[MMC_NUM_GP_PARTITION];  /* mmc general
>> purpose partitions */
>
> struct mmc_part parts[MMC_NUM_BOOT_PARTITION + MMC_NUM_GP_PARTITION];
> unsigned nr_parts;
>

Your review will always inspire me.
I will post again.
plz review after..
Thanks.
> A
>