Re: [PATCH] mmc : general purpose partition support.

[NamJae Jeon]

2011/9/23 J Freyensee <james_p_freyensee@xxxxxxxxxxxxxxx>
>
> On 09/22/2011 04:58 PM, NamJae Jeon wrote:
>>
>> 2011/9/23 J Freyensee<james_p_freyensee@xxxxxxxxxxxxxxx>:
>>>
>>> On 09/22/2011 04:15 PM, NamJae Jeon wrote:
>>>>
>>>> 2011/9/23 J Freyensee<james_p_freyensee@xxxxxxxxxxxxxxx>:
>>>>>
>>>>> 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
>>>>>>
>>>>>> Â Â Â 179 0 847872 mmcblk0
>>>>>> Â Â Â 179 192 4096 mmcblk0gp4
>>>>>> Â Â Â 179 160 4096 mmcblk0gp3
>>>>>> Â Â Â 179 128 4096 mmcblk0gp2
>>>>>> Â Â Â 179 96 Â1052672 mmcblk0gp1
>>>>>> Â Â Â 179 64 Â1024 mmcblk0boot1
>>>>>> Â Â Â 179 32 Â1024 mmcblk0boot0
>>>>>>
>>>>>> Signed-off-by: Namjae Jeon<linkinjeon@xxxxxxxxx>
>>>>>> ---
>>>>>> Âdrivers/mmc/card/block.c | Â 36 ++++++++++++++++++++++++++++++++++++
>>>>>> Âdrivers/mmc/core/mmc.c  |  42
>>>>>> ++++++++++++++++++++++++++++++++++++++++++
>>>>>> Âinclude/linux/mmc/card.h | Â Â4 ++++
>>>>>> Âinclude/linux/mmc/mmc.h Â| Â Â4 ++++
>>>>>> Â4 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)
>>>>>> Â Â Â Â Â Â Â Â Â Â Â Âreturn ret;
>>>>>> Â Â Â Â}
>>>>>>
>>>>>> + Â Â Â if (card->ext_csd.gp1_size) {
>>>>>> + Â Â Â Â Â Â Â ret = mmc_blk_alloc_part(card, md,
>>>>>> EXT_CSD_PART_CONFIG_ACC_GP1,
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â card->ext_csd.gp1_size>> Â Â Â9,
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â false,
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â "gp1");
>>>>>> + Â Â Â Â Â Â Â if (ret)
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â return ret;
>>>>>> + Â Â Â }
>>>>>> +
>>>>>
>>>>> 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? ÂIf mmc_blk_alloc_part() fails, is it a
>>>>> big
>>>>> problem, like kzalloc() failing? ÂIf 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).
>>>>
>>>> -> Â Âif card->ext_csd.gp1_size is no zero, it means general purpose
>>>> partition is enable.
>>>> and it can set up to 4 partition in specification. so we should check
>>>> it by next if().
>>>
>>> Please document that in your code. ÂPlease add a function header to this
>>> function.
>>
>> I will add comments at this code. ÂI don't understand why a function
>> header should be added yet.
>
> One or the other.
>
> but a function comment header should be added at some point. ÂYes, the mmc subsystem is pretty legacy, but any new work that gets added to the kernel is usually has higher standards for stuff like not just adding function header comments but putting them in a certain format...at least this is what I went through when I had things accepted upstream.

Okay, I will release patch v2 after adding function header comments again.
Thanks for your review.
>
>>
>>>
>>>>
>>>>>
>>>>>> + Â Â Â if (card->ext_csd.gp2_size) {
>>>>>> + Â Â Â Â Â Â Â ret = mmc_blk_alloc_part(card, md,
>>>>>> EXT_CSD_PART_CONFIG_ACC_GP2,
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â card->ext_csd.gp2_size>> Â Â Â9,
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â false,
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â "gp2");
>>>>>> + Â Â Â Â Â Â Â if (ret)
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â return ret;
>>>>>> + Â Â Â }
>>>>>> +
>>>>>> + Â Â Â if (card->ext_csd.gp3_size) {
>>>>>> + Â Â Â Â Â Â Â ret = mmc_blk_alloc_part(card, md,
>>>>>> EXT_CSD_PART_CONFIG_ACC_GP3,
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â card->ext_csd.gp3_size>> Â Â Â9,
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â false,
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â "gp3");
>>>>>> + Â Â Â Â Â Â Â if (ret)
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â return ret;
>>>>>> + Â Â Â }
>>>>>> +
>>>>>> + Â Â Â if (card->ext_csd.gp4_size) {
>>>>>> + Â Â Â Â Â Â Â ret = mmc_blk_alloc_part(card, md,
>>>>>> EXT_CSD_PART_CONFIG_ACC_GP4,
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â card->ext_csd.gp4_size>> Â Â Â9,
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â false,
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â "gp4");
>>>>>> + Â Â Â Â Â Â Â if (ret)
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â return ret;
>>>>>> + Â Â Â }
>>>>>> +
>>>>>> Â Â Â Âreturn ret;
>>>>>> Â}
>>>>>>
>>>>>> 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)
>>>>>> Â Â Â Â Â Â Â Â Â Â Â Âcard->ext_csd.enhanced_area_offset = -EINVAL;
>>>>>> Â Â Â Â Â Â Â Â Â Â Â Âcard->ext_csd.enhanced_area_size = -EINVAL;
>>>>>> Â Â Â Â Â Â Â Â}
>>>>>> +
>>>>>> + Â Â Â Â Â Â Â /*
>>>>>> + Â Â Â Â Â Â Â Â* General purpose partition Support
>>>>>> + Â Â Â Â Â Â Â Â*/
>>>>>> +
>>>>>> + Â Â Â Â Â Â Â if (ext_csd[EXT_CSD_PARTITION_SUPPORT]& Â Â Â0x1) {
>>>>>> +
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â u8 hc_erase_grp_sz =
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â u8 hc_wp_grp_sz =
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
>>>>>> +
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â card->ext_csd.enhanced_area_en = 1;
>>>>>> +
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â card->ext_csd.gp1_size =
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â (ext_csd[145]<< Â Â Â16) + (ext_csd[144]<<
>>>>>> Â Â8)
>>>>>> +
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ext_csd[143];
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â card->ext_csd.gp1_size *=
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â (size_t)(hc_erase_grp_sz *
>>>>>> hc_wp_grp_sz);
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â card->ext_csd.gp1_size<<= 19;
>>>>>> +
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â card->ext_csd.gp2_size =
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â (ext_csd[148]<< Â Â Â16) + (ext_csd[147]<<
>>>>>> Â Â8)
>>>>>> +
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ext_csd[146];
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â card->ext_csd.gp2_size *=
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â (size_t)(hc_erase_grp_sz *
>>>>>> hc_wp_grp_sz);
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â card->ext_csd.gp2_size<<= 19;
>>>>>> +
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â card->ext_csd.gp3_size =
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â (ext_csd[151]<< Â Â Â16) + (ext_csd[150]<<
>>>>>> Â Â8)
>>>>>> +
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ext_csd[149];
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â card->ext_csd.gp3_size *=
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â (size_t)(hc_erase_grp_sz *
>>>>>> hc_wp_grp_sz);
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â card->ext_csd.gp3_size<<= 19;
>>>>>> +
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â card->ext_csd.gp4_size =
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â (ext_csd[154]<< Â Â Â16) + (ext_csd[153]<<
>>>>>> Â Â8)
>>>>>> +
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ext_csd[152];
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â card->ext_csd.gp4_size *=
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â (size_t)(hc_erase_grp_sz *
>>>>>> hc_wp_grp_sz);
>>>>>> + Â Â Â Â Â Â Â Â Â Â Â card->ext_csd.gp4_size<<= 19;
>>>>>> + Â Â Â Â Â Â Â }
>>>>>> Â Â Â Â Â Â Â Âcard->ext_csd.sec_trim_mult =
>>>>>> Â Â Â Â Â Â Â Â Â Â Â Âext_csd[EXT_CSD_SEC_TRIM_MULT];
>>>>>> Â Â Â Â Â Â Â Âcard->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 {
>>>>>>    Âunsigned long long   Âenhanced_area_offset;  /* Units: Byte */
>>>>>>    Âunsigned int      Âenhanced_area_size;   /* Units: KB */
>>>>>>    Âunsigned int      Âboot_size;       Â/* in bytes */
>>>>>> +    unsigned int      Âgp1_size;        /* in bytes */
>>>>>> +    unsigned int      Âgp2_size;        /* in bytes */
>>>>>> +    unsigned int      Âgp3_size;        /* in bytes */
>>>>>> +    unsigned int      Âgp4_size;        /* in bytes */
>>>>>> Â Â Â Âu8 Â Â Â Â Â Â Â Â Â Â Âraw_partition_support; Â/* 160 */
>>>>>> Â Â Â Âu8 Â Â Â Â Â Â Â Â Â Â Âraw_erased_mem_count; Â /* 181 */
>>>>>> Â Â Â Âu8 Â Â Â Â Â Â Â Â Â Â Âraw_ext_csd_structure; Â/* 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 {
>>>>>> Â#define EXT_CSD_PART_CONFIG_ACC_MASK Â(0x7)
>>>>>> Â#define EXT_CSD_PART_CONFIG_ACC_BOOT0 (0x1)
>>>>>> Â#define EXT_CSD_PART_CONFIG_ACC_BOOT1 (0x2)
>>>>>> +#define EXT_CSD_PART_CONFIG_ACC_GP1 Â Â(0x4)
>>>>>> +#define EXT_CSD_PART_CONFIG_ACC_GP2 Â Â(0x5)
>>>>>> +#define EXT_CSD_PART_CONFIG_ACC_GP3 Â Â(0x6)
>>>>>> +#define EXT_CSD_PART_CONFIG_ACC_GP4 Â Â(0x7)
>>>>>>
>>>>>> Â#define EXT_CSD_CMD_SET_NORMAL Â Â Â Â Â Â Â Â(1<<0)
>>>>>> Â#define EXT_CSD_CMD_SET_SECURE Â Â Â Â Â Â Â Â(1<<1)
>>>>>
>>>>>
>>>>> --
>>>>> J (James/Jay) Freyensee
>>>>> Storage Technology Group
>>>>> Intel Corporation
>>>>>
>>>
>>>
>>> --
>>> J (James/Jay) Freyensee
>>> Storage Technology Group
>>> Intel Corporation
>>>
>
>
> --
> J (James/Jay) Freyensee
> Storage Technology Group
> Intel Corporation
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