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Date: Thu, 22 Sep 2011 15:08:19 -0700
From: J Freyensee <james_p_freyensee@...ux.intel.com>
To: Namjae Jeon <linkinjeon@...il.com>
CC: cjb@...top.org, linux-mmc@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc : general purpose partition support.
On 09/22/2011 08:34 AM, Namjae Jeon wrote:
> It allows general purpose parition in MMC Device. If it is enable, it will make mmcblk0gp1,gp2,gp3,gp4 partition like this.
>
>> cat /proc/paritition
> 179 0 847872 mmcblk0
> 179 192 4096 mmcblk0gp4
> 179 160 4096 mmcblk0gp3
> 179 128 4096 mmcblk0gp2
> 179 96 1052672 mmcblk0gp1
> 179 64 1024 mmcblk0boot1
> 179 32 1024 mmcblk0boot0
>
> Signed-off-by: Namjae Jeon<linkinjeon@...il.com>
> ---
> drivers/mmc/card/block.c | 36 ++++++++++++++++++++++++++++++++++++
> drivers/mmc/core/mmc.c | 42 ++++++++++++++++++++++++++++++++++++++++++
> include/linux/mmc/card.h | 4 ++++
> include/linux/mmc/mmc.h | 4 ++++
> 4 files changed, 86 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
> index 9b90726..074ec55 100644
> --- a/drivers/mmc/card/block.c
> +++ b/drivers/mmc/card/block.c
> @@ -1402,6 +1402,42 @@ static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
> return ret;
> }
>
> + if (card->ext_csd.gp1_size) {
> + ret = mmc_blk_alloc_part(card, md, EXT_CSD_PART_CONFIG_ACC_GP1,
> + card->ext_csd.gp1_size>> 9,
> + false,
> + "gp1");
> + if (ret)
> + return ret;
> + }
> +
if mmc_blk_alloc_part() fails for 'if (card->ext_csd.pt1_size)', why
would you want to give this code the opportunity to call
mmc_blk_alloc_part() again with the next if() below? If
mmc_blk_alloc_part() fails, is it a big problem, like kzalloc() failing?
If so, I would think you would want to immediately quit this function
and report an error (either use errno value or pass the value of ret).
> + if (card->ext_csd.gp2_size) {
> + ret = mmc_blk_alloc_part(card, md, EXT_CSD_PART_CONFIG_ACC_GP2,
> + card->ext_csd.gp2_size>> 9,
> + false,
> + "gp2");
> + if (ret)
> + return ret;
> + }
> +
> + if (card->ext_csd.gp3_size) {
> + ret = mmc_blk_alloc_part(card, md, EXT_CSD_PART_CONFIG_ACC_GP3,
> + card->ext_csd.gp3_size>> 9,
> + false,
> + "gp3");
> + if (ret)
> + return ret;
> + }
> +
> + if (card->ext_csd.gp4_size) {
> + ret = mmc_blk_alloc_part(card, md, EXT_CSD_PART_CONFIG_ACC_GP4,
> + card->ext_csd.gp4_size>> 9,
> + false,
> + "gp4");
> + if (ret)
> + return ret;
> + }
> +
> return ret;
> }
>
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index 10f5a19..cc31511 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -393,6 +393,48 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
> card->ext_csd.enhanced_area_offset = -EINVAL;
> card->ext_csd.enhanced_area_size = -EINVAL;
> }
> +
> + /*
> + * General purpose partition Support
> + */
> +
> + if (ext_csd[EXT_CSD_PARTITION_SUPPORT]& 0x1) {
> +
> + u8 hc_erase_grp_sz =
> + ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
> + u8 hc_wp_grp_sz =
> + ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
> +
> + card->ext_csd.enhanced_area_en = 1;
> +
> + card->ext_csd.gp1_size =
> + (ext_csd[145]<< 16) + (ext_csd[144]<< 8) +
> + ext_csd[143];
> + card->ext_csd.gp1_size *=
> + (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
> + card->ext_csd.gp1_size<<= 19;
> +
> + card->ext_csd.gp2_size =
> + (ext_csd[148]<< 16) + (ext_csd[147]<< 8) +
> + ext_csd[146];
> + card->ext_csd.gp2_size *=
> + (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
> + card->ext_csd.gp2_size<<= 19;
> +
> + card->ext_csd.gp3_size =
> + (ext_csd[151]<< 16) + (ext_csd[150]<< 8) +
> + ext_csd[149];
> + card->ext_csd.gp3_size *=
> + (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
> + card->ext_csd.gp3_size<<= 19;
> +
> + card->ext_csd.gp4_size =
> + (ext_csd[154]<< 16) + (ext_csd[153]<< 8) +
> + ext_csd[152];
> + card->ext_csd.gp4_size *=
> + (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
> + card->ext_csd.gp4_size<<= 19;
> + }
> card->ext_csd.sec_trim_mult =
> ext_csd[EXT_CSD_SEC_TRIM_MULT];
> card->ext_csd.sec_erase_mult =
> diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
> index b460fc2..96a98a7 100644
> --- a/include/linux/mmc/card.h
> +++ b/include/linux/mmc/card.h
> @@ -64,6 +64,10 @@ struct mmc_ext_csd {
> unsigned long long enhanced_area_offset; /* Units: Byte */
> unsigned int enhanced_area_size; /* Units: KB */
> unsigned int boot_size; /* in bytes */
> + unsigned int gp1_size; /* in bytes */
> + unsigned int gp2_size; /* in bytes */
> + unsigned int gp3_size; /* in bytes */
> + unsigned int gp4_size; /* in bytes */
> u8 raw_partition_support; /* 160 */
> u8 raw_erased_mem_count; /* 181 */
> u8 raw_ext_csd_structure; /* 194 */
> diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
> index 5a794cb..380720a 100644
> --- a/include/linux/mmc/mmc.h
> +++ b/include/linux/mmc/mmc.h
> @@ -303,6 +303,10 @@ struct _mmc_csd {
> #define EXT_CSD_PART_CONFIG_ACC_MASK (0x7)
> #define EXT_CSD_PART_CONFIG_ACC_BOOT0 (0x1)
> #define EXT_CSD_PART_CONFIG_ACC_BOOT1 (0x2)
> +#define EXT_CSD_PART_CONFIG_ACC_GP1 (0x4)
> +#define EXT_CSD_PART_CONFIG_ACC_GP2 (0x5)
> +#define EXT_CSD_PART_CONFIG_ACC_GP3 (0x6)
> +#define EXT_CSD_PART_CONFIG_ACC_GP4 (0x7)
>
> #define EXT_CSD_CMD_SET_NORMAL (1<<0)
> #define EXT_CSD_CMD_SET_SECURE (1<<1)
--
J (James/Jay) Freyensee
Storage Technology Group
Intel Corporation
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