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Date: Fri, 30 Sep 2011 13:34:24 -0400
From: "Andrei E. Warkentin" <andrey.warkentin@...il.com>
To: Namjae Jeon <linkinjeon@...il.com>
Cc: cjb@...top.org, linux-mmc@...r.kernel.org,
linux-kernel@...r.kernel.org, awarkentin@...are.com,
adrian.hunter@...el.com, linus.walleij@...aro.org,
james_p_freyensee@...ux.intel.com, sebras@...il.com,
Ulf.Hansson@...ricsson.com, stefan.xk.nilsson@...ricsson.com,
per.forlin@...ricsson.com, johan.rudholm@...ricsson.com
Subject: Re: [PATCH v4] mmc : general purpose partition support.
Hi Namjae,
Why don't you update card->nr_parts inside mmc_part_add? You're making
this too complicated. There
is also no need for the part_cfg array.
2011/9/30 Namjae Jeon <linkinjeon@...il.com>:
> 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>
> ---
>
> +/* partition configuration array */
> +static const unsigned int part_cfg[] = {
> + 0x1, 0x2, 0x4, 0x5, 0x6, 7,
> +};
> +
No need. Plus this is obscure.
> - card->ext_csd.boot_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
> + if (ext_csd[EXT_CSD_BOOT_MULT]) {
> + card->nr_parts = MMC_NUM_BOOT_PARTITION;
> + for (idx = 0, part_num = 0;
> + idx < MMC_NUM_BOOT_PARTITION; idx++,
> + part_num++) {
> + part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
> + mmc_part_add(card, part_size, part_cfg[idx],
> + "boot%d", idx, part_num, true);
> + }
> + }
> }
There is no need for part_num (you have idx for that). And there is no
need for passing the actual array
index either - that's why you have mmc_part_add: it will do
card->parts[card->nr_parts++] = new_part.
if (ext_csd[EXT_CSD_BOOT_MULT]) {
for (idx = 0, part_num = 0;
idx < MMC_NUM_BOOT_PARTITION; idx++) {
part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
mmc_part_add(card, part_size,
EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx,
"boot%d", idx, true);
}
}
> + 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->nr_parts += MMC_NUM_GP_PARTITION;
> + for (part_num = 0, gp_size_mult = 143;
> + idx < card->nr_parts;
> + idx++, part_num++, gp_size_mult += 3) {
> + if (!ext_csd[gp_size_mult] &&
> + !ext_csd[gp_size_mult + 1] &&
> + !ext_csd[gp_size_mult + 2])
> + continue;
> + part_size = (ext_csd[gp_size_mult + 2] << 16) +
> + (ext_csd[gp_size_mult + 1] << 8) +
> + ext_csd[gp_size_mult];
> + part_size *= (size_t)(hc_erase_grp_sz *
> + hc_wp_grp_sz);
> + part_size <<= 19;
> + mmc_part_add(card, part_size, part_cfg[idx],
> + "gp%d", idx, part_num, false);
> + }
> + }
Same story: get rid of part_num, don't touch card->nr_parts, and get
rid of part_cfg array access.
card->ext_csd.enhanced_area_en = 1;
for (idx = 0, gp_size_mult = 143;
idx < MMC_NUM_GP_PARTITION;
idx++, gp_size_mult += 3) {
if (!ext_csd[gp_size_mult] &&
!ext_csd[gp_size_mult + 1] &&
!ext_csd[gp_size_mult + 2])
continue;
part_size = (ext_csd[gp_size_mult + 2] << 16) +
(ext_csd[gp_size_mult + 1] << 8) +
ext_csd[gp_size_mult];
part_size *= (size_t)(hc_erase_grp_sz *
hc_wp_grp_sz);
part_size <<= 19;
mmc_part_add(card, part_size, idx +
EXT_CSD_PART_CONFIG_ACC_GP0,
"gp%d", idx, false);
}
}
> /*
> + * This function fill contents in mmc_part.
> + */
> +static inline void mmc_part_add(struct mmc_card *card, unsigned int size,
> + unsigned int part_cfg, char *name, int idx, int part_num, bool ro)
> +{
> + card->part[idx].size = size;
> + card->part[idx].cookie = part_cfg;
> + sprintf(card->part[idx].name, name, part_num);
> + card->part[idx].force_ro = ro;
> +}
static inline void mmc_part_add(struct mmc_card *card, unsigned int size,
unsigned int part_cfg, char *name, int idx, bool ro)
{
card->part[card->nr_parts].size = size;
card->part[card->nr_parts].cookie = part_cfg;
sprintf(card->part[card->nr_parts].name, name, idx);
card->part[card->nr_parts].force_ro = ro;
card->nr_parts++;
}
> #define EXT_CSD_PART_CONFIG_ACC_MASK (0x7)
> -#define EXT_CSD_PART_CONFIG_ACC_BOOT0 (0x1)
> -#define EXT_CSD_PART_CONFIG_ACC_BOOT1 (0x2)
>
I'd also keep the MMC_NUM_BOOT_PARTITION and MMC_NUM_GP_PARTITION defs
at the same location.
/* The number of MMC physical partitions
* It consist of boot partitions(2), general purpose partitions(4) in MMC v4.4
*/
#define MMC_NUM_BOOT_PARTITION 2
#define MMC_NUM_GP_PARTITION 4
#define EXT_CSD_PART_CONFIG_ACC_BOOT0 (0x1)
#define EXT_CSD_PART_CONFIG_ACC_GP0 (0x4)
A
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