These two look good if no one complains go ahead. (I'm not 100% on
this libbsd stuff yet.)
On Wed, Apr 14, 2021 at 1:21 AM Christian Mauderer
<christian.maude...@embedded-brains.de> wrote:
>
> Possible data sources for SD driver:
>
> - mmc_sd_switch():
> - length: 64 byte;
> - buffer on stack
> - mmc_test_bus_width():
> - length: 4 or 8 byte
> - buffer in program memory or on stack
> - mmc_app_send_scr():
> - length: 8 byte
> - buffer from device ivar structure
> - mmc_app_sd_status():
> - length: 64 byte
> - buffer from device ivar structure
> - mmc_send_ext_csd():
> - length: MMC_EXTCSD_SIZE = 512
> - buffer from device ivar structure
> - rtems_bsd_mmcsd_disk_read_write():
> - length: depends on read
> - buffer from rtems_blkdev buffer -> already aligned
> - mmcsd_ioctl_cmd():
> - length: depends on call
> - buffer malloced, not aligned -> patched in RTEMS
>
> So the problematic buffers are only the ones up to 512 bytes. Copy these data
> into a buffer to avoid that problem.
> ---
> rtemsbsd/sys/dev/mmc/st-sdmmc.c | 14 ++++++++++----
> 1 file changed, 10 insertions(+), 4 deletions(-)
>
> diff --git a/rtemsbsd/sys/dev/mmc/st-sdmmc.c b/rtemsbsd/sys/dev/mmc/st-sdmmc.c
> index e50b400a..4b202952 100644
> --- a/rtemsbsd/sys/dev/mmc/st-sdmmc.c
> +++ b/rtemsbsd/sys/dev/mmc/st-sdmmc.c
> @@ -117,7 +117,8 @@ __FBSDID("$FreeBSD$");
> #define RES_IRQ_SDMMC 2
> #define RES_NR 3
>
> -#define DMA_BUF_SIZE CPU_CACHE_LINE_BYTES
> +/* Maximum non-aligned buffer is 512 byte from mmc_send_ext_csd() */
> +#define DMA_BUF_SIZE 512
>
> #if 0
> #define debug_print(sc, lvl, ...) \
> @@ -575,14 +576,19 @@ st_sdmmc_cmd_do(struct st_sdmmc_softc *sc, struct
> mmc_command *cmd)
>
> BSD_ASSERT(xferlen % (1 << blksize) == 0);
>
> - if (xferlen < CPU_CACHE_LINE_BYTES) {
> + data = cmd->data->data;
> + /*
> + * Check whether data have to be copied. Reason is either
> + * misaligned start address or misaligned length.
> + */
> + if (((uintptr_t)data % CPU_CACHE_LINE_BYTES != 0) ||
> + (xferlen % CPU_CACHE_LINE_BYTES) != 0) {
> + BSD_ASSERT(xferlen < DMA_BUF_SIZE);
> if ((cmd->data->flags & MMC_DATA_READ) == 0) {
> memcpy(sc->dmabuf, cmd->data->data, xferlen);
> }
> data = sc->dmabuf;
> short_xfer = true;
> - } else {
> - data = cmd->data->data;
> }
>
> dctrl |= blksize << SDMMC_DCTRL_DBLOCKSIZE_Pos;
> --
> 2.26.2
>
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