[U-Boot] [PATCH v1 1/1] usb: gadget: fastboot: Add fastboot erase

[Dileep Katta]

Hi Rob,

On 12 February 2015 at 14:35, Rob Herring <robherring2 at gmail.com> wrote:
> On Tue, Feb 10, 2015 at 2:49 AM, Dileep Katta <dileep.katta at linaro.org> wrote:
>> Adds the fastboot erase functionality, to erase a partition
>> specified by name. The erase is performed based on erase group size,
>> to avoid erasing other partitions. The start address and the size
>> is aligned to the erase group size for this.
>>
>> Currently only supports erasing from eMMC.
>>
>> Signed-off-by: Dileep Katta <dileep.katta at linaro.org>
>> ---
>> Note: The changes are on top of oem command support added by robh at kernel.org
>>
>>  common/fb_mmc.c                 | 58 +++++++++++++++++++++++++++++++++++++++++
>>  drivers/usb/gadget/f_fastboot.c | 23 ++++++++++++++++
>>  include/fb_mmc.h                |  1 +
>>  3 files changed, 82 insertions(+)
>>
>> diff --git a/common/fb_mmc.c b/common/fb_mmc.c
>> index 6ea3938..3911989 100644
>> --- a/common/fb_mmc.c
>> +++ b/common/fb_mmc.c
>> @@ -10,6 +10,7 @@
>>  #include <part.h>
>>  #include <aboot.h>
>>  #include <sparse_format.h>
>> +#include <mmc.h>
>>
>>  #ifndef CONFIG_FASTBOOT_GPT_NAME
>>  #define CONFIG_FASTBOOT_GPT_NAME GPT_ENTRY_NAME
>> @@ -110,3 +111,60 @@ void fb_mmc_flash_write(const char *cmd, void *download_buffer,
>>                 write_raw_image(dev_desc, &info, cmd, download_buffer,
>>                                 download_bytes);
>>  }
>> +
>> +void fb_mmc_erase(const char *cmd, char *response)
>> +{
>> +       int ret;
>> +       block_dev_desc_t *dev_desc;
>> +       disk_partition_t info;
>> +       lbaint_t blks, blks_start, blks_size, grp_size;
>> +       struct mmc *mmc = find_mmc_device(CONFIG_FASTBOOT_FLASH_MMC_DEV);
>> +
>> +       if (mmc == NULL) {
>> +               error("invalid mmc device\n");
>> +               fastboot_fail("invalid mmc device");
>
> Perhaps fastboot_fail should also call error().
There is error() before every fastboot_fail(). You mean to move
error() inside fastboot_fail()? If yes, I will do it.
>
>> +               return;
>> +       }
>> +
>> +       /* initialize the response buffer */
>> +       response_str = response;
>> +
>> +       dev_desc = get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
>> +       if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) {
>> +               error("invalid mmc device\n");
>> +               fastboot_fail("invalid mmc device");
>> +               return;
>> +       }
>> +
>> +       ret = get_partition_info_efi_by_name(dev_desc, cmd, &info);
>> +       if (ret) {
>> +               error("cannot find partition: '%s'\n", cmd);
>> +               fastboot_fail("cannot find partition");
>> +               return;
>> +       }
>> +
>> +       puts("Erasing partition\n");
>
> This can probably be dropped since you have a print below.
Will remove.
>> +
>> +       /* Align blocks to erase group size to avoid erasing other partitions */
>
> The partitioning could should probably enforce optimal alignment, but
> I guess that's a separate patch.
Fine. Will do it as a separate patch.
>
>> +       grp_size = mmc->erase_grp_size;
>> +       blks_start = (info.start + grp_size - 1) & ~(grp_size - 1);
>> +       if (info.size >= grp_size)
>> +               blks_size = (info.size - (blks_start - info.start)) &
>> +                               (~(grp_size - 1));
>> +       else
>> +               blks_size = 0;
>> +
>> +       printf("Erasing blocks " LBAFU " to " LBAFU " due to alignment\n",
>> +              blks_start, blks_start + blks_size);
>> +
>> +       blks = dev_desc->block_erase(dev_desc->dev, blks_start, blks_size);
>> +       if (blks != blks_size) {
>> +               error("failed erasing from device %d\n", dev_desc->dev);
>> +               fastboot_fail("failed erasing from device");
>> +               return;
>> +       }
>> +
>> +       printf("........ erased " LBAFU " bytes from '%s'\n",
>> +              blks_size * info.blksz, cmd);
>> +       fastboot_okay("");
>> +}
>> diff --git a/drivers/usb/gadget/f_fastboot.c b/drivers/usb/gadget/f_fastboot.c
>> index f7d84bf..a8d8205 100644
>> --- a/drivers/usb/gadget/f_fastboot.c
>> +++ b/drivers/usb/gadget/f_fastboot.c
>> @@ -535,6 +535,26 @@ static void cb_oem(struct usb_ep *ep, struct usb_request *req)
>>         }
>>  }
>>
>> +static void cb_erase(struct usb_ep *ep, struct usb_request *req)
>
> This should be conditional on CONFIG_FASTBOOT_FLASH
Will make it conditional as in cb_oem().
>
>> +{
>> +       char *cmd = req->buf;
>> +       char response[RESPONSE_LEN];
>> +
>> +       strsep(&cmd, ":");
>> +       if (!cmd) {
>> +               error("missing partition name\n");
>> +               fastboot_tx_write_str("FAILmissing partition name");
>> +               return;
>> +       }
>> +
>> +       strcpy(response, "FAILno flash device defined");
>> +
>> +#ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
>> +       fb_mmc_erase(cmd, response);
>> +#endif
>> +       fastboot_tx_write_str(response);
>> +}
>> +
>>  struct cmd_dispatch_info {
>>         char *cmd;
>>         void (*cb)(struct usb_ep *ep, struct usb_request *req);
>> @@ -566,6 +586,9 @@ static const struct cmd_dispatch_info cmd_dispatch_info[] = {
>>         {
>>                 .cmd = "oem",
>>                 .cb = cb_oem,
>> +       }, {
>> +               .cmd = "erase",
>> +               .cb = cb_erase,
>>         },
>>  };
>>
>> diff --git a/include/fb_mmc.h b/include/fb_mmc.h
>> index 1ad1d13..402ba9b 100644
>> --- a/include/fb_mmc.h
>> +++ b/include/fb_mmc.h
>> @@ -6,3 +6,4 @@
>>
>>  void fb_mmc_flash_write(const char *cmd, void *download_buffer,
>>                         unsigned int download_bytes, char *response);
>> +void fb_mmc_erase(const char *cmd, char *response);
>> --
>> 1.8.3.2
>>
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Thanks for the comments. Will send v2 once I get your input on fastboot_fail().

Regards,
Dileep