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Message-ID: <4E7BD079.6070309@linux.intel.com>
Date: Thu, 22 Sep 2011 17:19:05 -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 04:58 PM, NamJae Jeon wrote:
> 2011/9/23 J Freyensee<james_p_freyensee@...ux.intel.com>:
>> On 09/22/2011 04:15 PM, NamJae Jeon wrote:
>>>
>>> 2011/9/23 J Freyensee<james_p_freyensee@...ux.intel.com>:
>>>>
>>>> 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.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. Please add a function header to this
>> function.
> I will add comments at this code. I 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. Yes, 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.
>
>>
>>>
>>>>
>>>>> + 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
>>>>
>>
>>
>> --
>> J (James/Jay) Freyensee
>> Storage Technology Group
>> Intel Corporation
>>
--
J (James/Jay) Freyensee
Storage Technology Group
Intel Corporation
--
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