On 3/12/20 4:05 am, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@xxxxxxxxxx>
>
> Move the task descriptor initialization into cqhci_prep_task_desc(), and
> make it initialize all 128 bits of the task descriptor if the host
> controller is using 128-bit task descriptors.
>
> This is needed to prepare for CQHCI inline encryption support, which
> requires 128-bit task descriptors and uses the upper 64 bits.
>
> Note: since some host controllers already enable 128-bit task
> descriptors, it's unclear why the previous code worked when it wasn't
> initializing the upper 64 bits. One possibility is that the bits are
> being ignored because the features that use them aren't enabled yet.
> In any case, setting them to 0 won't hurt.
Coherent allocations are zero-initialized. So the upper 64-bits stay zero.
People set 128-bit anyway because the hardware needs it.
>
> Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> ---
> drivers/mmc/host/cqhci-core.c | 30 ++++++++++++++++++++----------
> 1 file changed, 20 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/mmc/host/cqhci-core.c b/drivers/mmc/host/cqhci-core.c
> index 697fe40756bf2..ad7c9acff1728 100644
> --- a/drivers/mmc/host/cqhci-core.c
> +++ b/drivers/mmc/host/cqhci-core.c
> @@ -408,13 +408,15 @@ static void cqhci_disable(struct mmc_host *mmc)
> }
>
> static void cqhci_prep_task_desc(struct mmc_request *mrq,
> - u64 *data, bool intr)
> + struct cqhci_host *cq_host, int tag)
> {
> + __le64 *task_desc = (__le64 __force *)get_desc(cq_host, tag);
> u32 req_flags = mrq->data->flags;
> + u64 desc0;
>
> - *data = CQHCI_VALID(1) |
> + desc0 = CQHCI_VALID(1) |
> CQHCI_END(1) |
> - CQHCI_INT(intr) |
> + CQHCI_INT(1) |
> CQHCI_ACT(0x5) |
> CQHCI_FORCED_PROG(!!(req_flags & MMC_DATA_FORCED_PRG)) |
> CQHCI_DATA_TAG(!!(req_flags & MMC_DATA_DAT_TAG)) |
> @@ -425,8 +427,19 @@ static void cqhci_prep_task_desc(struct mmc_request *mrq,
> CQHCI_BLK_COUNT(mrq->data->blocks) |
> CQHCI_BLK_ADDR((u64)mrq->data->blk_addr);
>
> - pr_debug("%s: cqhci: tag %d task descriptor 0x%016llx\n",
> - mmc_hostname(mrq->host), mrq->tag, (unsigned long long)*data);
> + task_desc[0] = cpu_to_le64(desc0);
> +
> + if (cq_host->caps & CQHCI_TASK_DESC_SZ_128) {
> + u64 desc1 = 0;
> +
> + task_desc[1] = cpu_to_le64(desc1);
> +
> + pr_debug("%s: cqhci: tag %d task descriptor 0x%016llx%016llx\n",
> + mmc_hostname(mrq->host), mrq->tag, desc1, desc0);
> + } else {
> + pr_debug("%s: cqhci: tag %d task descriptor 0x%016llx\n",
> + mmc_hostname(mrq->host), mrq->tag, desc0);
> + }
> }
>
> static int cqhci_dma_map(struct mmc_host *host, struct mmc_request *mrq)
> @@ -567,8 +580,6 @@ static inline int cqhci_tag(struct mmc_request *mrq)
> static int cqhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
> {
> int err = 0;
> - u64 data = 0;
> - u64 *task_desc = NULL;
> int tag = cqhci_tag(mrq);
> struct cqhci_host *cq_host = mmc->cqe_private;
> unsigned long flags;
> @@ -598,9 +609,8 @@ static int cqhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
> }
>
> if (mrq->data) {
> - task_desc = (__le64 __force *)get_desc(cq_host, tag);
> - cqhci_prep_task_desc(mrq, &data, 1);
> - *task_desc = cpu_to_le64(data);
> + cqhci_prep_task_desc(mrq, cq_host, tag);
> +
> err = cqhci_prep_tran_desc(mrq, cq_host, tag);
> if (err) {
> pr_err("%s: cqhci: failed to setup tx desc: %d\n",
>
