Re: [Qemu-devel] [PATCH 28/28] hw/sd.c: add SD card save/load support

[Michael Walle <michael@walle.cc>]

Hi all,

Sorry for digging out such an old thread :) but this patch introduced a memory 
corruption, see below.

Am Dienstag 30 Oktober 2012, 09:44:24 schrieb Peter Maydell:
> From: Igor Mitsyanko <i.mitsyanko@gmail.com>
> 
> This patch updates SD card model to support save/load of card's state.
> 
> Signed-off-by: Igor Mitsyanko <i.mitsyanko@samsung.com>
> Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> ---
>  hw/sd.c |   89
> +++++++++++++++++++++++++++++++++++++++++++++------------------ 1 file
> changed, 64 insertions(+), 25 deletions(-)
> 
> diff --git a/hw/sd.c b/hw/sd.c
> index b2f211c..3c34d43 100644
> --- a/hw/sd.c
> +++ b/hw/sd.c
> @@ -55,24 +55,28 @@ typedef enum {
>      sd_illegal = -2,
>  } sd_rsp_type_t;
> 
> +enum SDCardModes {
> +    sd_inactive,
> +    sd_card_identification_mode,
> +    sd_data_transfer_mode,
> +};
> +
> +enum SDCardStates {
> +    sd_inactive_state = -1,
> +    sd_idle_state = 0,
> +    sd_ready_state,
> +    sd_identification_state,
> +    sd_standby_state,
> +    sd_transfer_state,
> +    sd_sendingdata_state,
> +    sd_receivingdata_state,
> +    sd_programming_state,
> +    sd_disconnect_state,
> +};
> +
>  struct SDState {
> -    enum {
> -        sd_inactive,
> -        sd_card_identification_mode,
> -        sd_data_transfer_mode,
> -    } mode;
> -    enum {
> -        sd_inactive_state = -1,
> -        sd_idle_state = 0,
> -        sd_ready_state,
> -        sd_identification_state,
> -        sd_standby_state,
> -        sd_transfer_state,
> -        sd_sendingdata_state,
> -        sd_receivingdata_state,
> -        sd_programming_state,
> -        sd_disconnect_state,
> -    } state;
> +    uint32_t mode;    /* current card mode, one of SDCardModes */
> +    int32_t state;    /* current card state, one of SDCardStates */
>      uint32_t ocr;
>      uint8_t scr[8];
>      uint8_t cid[16];
> @@ -83,21 +87,22 @@ struct SDState {
>      uint32_t vhs;
>      bool wp_switch;
>      unsigned long *wp_groups;
> +    int32_t wpgrps_size;
>      uint64_t size;
> -    int blk_len;
> +    uint32_t blk_len;
>      uint32_t erase_start;
>      uint32_t erase_end;
>      uint8_t pwd[16];
> -    int pwd_len;
> -    int function_group[6];
> +    uint32_t pwd_len;
> +    uint8_t function_group[6];
> 
>      bool spi;
> -    int current_cmd;
> +    uint8_t current_cmd;
>      /* True if we will handle the next command as an ACMD. Note that this
> does * *not* track the APP_CMD status bit!
>       */
>      bool expecting_acmd;
> -    int blk_written;
> +    uint32_t blk_written;
>      uint64_t data_start;
>      uint32_t data_offset;
>      uint8_t data[512];
> @@ -421,8 +426,9 @@ static void sd_reset(SDState *sd, BlockDriverState
> *bdrv) if (sd->wp_groups)
>          g_free(sd->wp_groups);
>      sd->wp_switch = bdrv ? bdrv_is_read_only(bdrv) : false;
> -    sd->wp_groups = bitmap_new(sect);
> -    memset(sd->function_group, 0, sizeof(int) * 6);
> +    sd->wpgrps_size = sect;
> +    sd->wp_groups = bitmap_new(sd->wpgrps_size);
> +    memset(sd->function_group, 0, sizeof(sd->function_group));
>      sd->erase_start = 0;
>      sd->erase_end = 0;
>      sd->size = size;
> @@ -446,6 +452,38 @@ static const BlockDevOps sd_block_ops = {
>      .change_media_cb = sd_cardchange,
>  };
> 
> +static const VMStateDescription sd_vmstate = {
> +    .name = "sd-card",
> +    .version_id = 1,
> +    .minimum_version_id = 1,
> +    .fields = (VMStateField[]) {
> +        VMSTATE_UINT32(mode, SDState),
> +        VMSTATE_INT32(state, SDState),
> +        VMSTATE_UINT8_ARRAY(cid, SDState, 16),
> +        VMSTATE_UINT8_ARRAY(csd, SDState, 16),
> +        VMSTATE_UINT16(rca, SDState),
> +        VMSTATE_UINT32(card_status, SDState),
> +        VMSTATE_PARTIAL_BUFFER(sd_status, SDState, 1),
> +        VMSTATE_UINT32(vhs, SDState),
> +        VMSTATE_BITMAP(wp_groups, SDState, 0, wpgrps_size),
> +        VMSTATE_UINT32(blk_len, SDState),
> +        VMSTATE_UINT32(erase_start, SDState),
> +        VMSTATE_UINT32(erase_end, SDState),
> +        VMSTATE_UINT8_ARRAY(pwd, SDState, 16),
> +        VMSTATE_UINT32(pwd_len, SDState),
> +        VMSTATE_UINT8_ARRAY(function_group, SDState, 6),
> +        VMSTATE_UINT8(current_cmd, SDState),
> +        VMSTATE_BOOL(expecting_acmd, SDState),
> +        VMSTATE_UINT32(blk_written, SDState),
> +        VMSTATE_UINT64(data_start, SDState),
> +        VMSTATE_UINT32(data_offset, SDState),
> +        VMSTATE_UINT8_ARRAY(data, SDState, 512),
> +        VMSTATE_BUFFER_UNSAFE(buf, SDState, 1, 512),

buf is dynamically allocated in the sd_init(), see also the SDState:

struct SDState {
[...]
    uint8_t *buf;

    bool enable;
};


> +        VMSTATE_BOOL(enable, SDState),
> +        VMSTATE_END_OF_LIST()
> +    }
> +};
> +
>  /* We do not model the chip select pin, so allow the board to select
>     whether card should be in SSI or MMC/SD mode.  It is also up to the
>     board to ensure that ssi transfers only occur when the chip select
> @@ -463,6 +501,7 @@ SDState *sd_init(BlockDriverState *bs, bool is_spi)
>          bdrv_attach_dev_nofail(sd->bdrv, sd);
>          bdrv_set_dev_ops(sd->bdrv, &sd_block_ops, sd);
>      }
> +    vmstate_register(NULL, -1, &sd_vmstate, sd);
>      return sd;
>  }
> 
> @@ -576,7 +615,7 @@ static void sd_lock_command(SDState *sd)
>              sd->card_status |= LOCK_UNLOCK_FAILED;
>              return;
>          }
> -        bitmap_zero(sd->wp_groups, sd_addr_to_wpnum(sd->size) + 1);
> +        bitmap_zero(sd->wp_groups, sd->wpgrps_size);
>          sd->csd[14] &= ~0x10;
>          sd->card_status &= ~CARD_IS_LOCKED;
>          sd->pwd_len = 0;


-- 
Michael