On 27 July 2016 at 17:59, Shawn Lin <shawn.lin@xxxxxxxxxxxxxx> wrote:
> On 2016/7/27 15:17, Baolin Wang wrote:
>>
>> Before issuing mmc_erase() function, users always have checked if it can
>> erase with mmc_can_erase/trim/discard() function, thus remove the
>> redundant
>> erase checking in mmc_erase() function.
>>
>> This patch also optimizes the erase start/end sector alignment with
>> round_up()/round_down() function, when erase command is MMC_ERASE_ARG.
>>
>> Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxx>
>> ---
>> Changes since v1:
>> - Add the alignment if card->erase_size is not power of 2.
>> ---
>> drivers/mmc/core/core.c | 78
>> +++++++++++++++++++++++++++++------------------
>> 1 file changed, 48 insertions(+), 30 deletions(-)
>>
>> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
>> index b4c08d1a..303a917 100644
>> --- a/drivers/mmc/core/core.c
>> +++ b/drivers/mmc/core/core.c
>> @@ -2195,6 +2195,51 @@ out:
>> return err;
>> }
>>
>> +static unsigned int mmc_align_erase_size(struct mmc_card *card,
>> + unsigned int *from,
>> + unsigned int *to,
>> + unsigned int nr)
>> +{
>> + unsigned int from_new = *from, nr_new = nr, rem;
>> +
>> + if (is_power_of_2(card->erase_size)) {
>> + unsigned int temp = from_new;
>> +
>> + from_new = round_up(temp, card->erase_size);
>> + rem = from_new - temp;
>> +
>> + if (nr_new > rem)
>> + nr_new -= rem;
>> + else
>> + return 0;
>> +
>> + nr_new = round_down(nr_new, card->erase_size);
>> + } else {
>> + rem = from_new % card->erase_size;
>> + if (rem) {
>> + rem = card->erase_size - rem;
>> + from_new += rem;
>> + if (nr_new > rem)
>> + nr_new -= rem;
>> + else
>> + return 0;
>> + }
>> +
>> + rem = nr_new % card->erase_size;
>> + if (rem)
>> + nr_new -= rem;
>> + }
>> +
>> + if (nr_new == 0)
>> + return 0;
>> +
>> + /* 'from' and 'to' are inclusive */
>> + *to = from_new + nr_new - 1;
>> + *from = from_new;
>> +
>> + return nr_new;
>> +}
>> +
>> /**
>> * mmc_erase - erase sectors.
>> * @card: card to erase
>> @@ -2210,13 +2255,6 @@ int mmc_erase(struct mmc_card *card, unsigned int
>> from, unsigned int nr,
>> unsigned int rem, to = from + nr;
>> int err;
>>
>> - if (!(card->host->caps & MMC_CAP_ERASE) ||
>> - !(card->csd.cmdclass & CCC_ERASE))
>
>
> Why remove the check , "!(card->csd.cmdclass & CCC_ERASE))"?
Cause we always issue mmc_can_erase() function before strating to do
mmc erase, so these looks like redundant.
>> - return -EOPNOTSUPP;
>> -
>> - if (!card->erase_size)
>> - return -EOPNOTSUPP;
>> -
>> if (mmc_card_sd(card) && arg != MMC_ERASE_ARG)
>> return -EOPNOTSUPP;
>>
>> @@ -2234,31 +2272,11 @@ int mmc_erase(struct mmc_card *card, unsigned int
>> from, unsigned int nr,
>> }
>>
>> if (arg == MMC_ERASE_ARG) {
>> - rem = from % card->erase_size;
>> - if (rem) {
>> - rem = card->erase_size - rem;
>> - from += rem;
>> - if (nr > rem)
>> - nr -= rem;
>> - else
>> - return 0;
>> - }
>> - rem = nr % card->erase_size;
>> - if (rem)
>> - nr -= rem;
>> + rem = mmc_align_erase_size(card, &from, &to, nr);
>> + if (rem == 0)
>> + return 0;
>> }
>>
>> - if (nr == 0)
>> - return 0;
>> -
>> - to = from + nr;
>> -
>> - if (to <= from)
>> - return -EINVAL;
>> -
>> - /* 'from' and 'to' are inclusive */
>> - to -= 1;
>> -
>> /*
>> * Special case where only one erase-group fits in the timeout
>> budget:
>> * If the region crosses an erase-group boundary on this
>> particular
>>
>
>
> --
> Best Regards
> Shawn Lin
>
> --
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--
Baolin.wang
Best Regards
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