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st-sdmmc: Handle short not cache aligned buffers

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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.
This commit is contained in:
Christian Mauderer 2021-04-13 14:02:39 +02:00
parent 8aa3ddfbd7
commit 829afafbcb
1 changed files with 10 additions and 4 deletions
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14
rtemsbsd/sys/dev/mmc/st-sdmmc.c
View File

@ -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;