The cookie tracking in dmaengine expects all submissions completed in
order. Some DMA devices like Intel DSA can complete submissions out of
order, especially if configured with a work queue sharing multiple DMA
engines. Add a status DMA_OUT_OF_ORDER that tx_status can be returned for
those DMA devices. The user should use callbacks to track the completion
rather than the DMA cookie. This would address the issue of dmatest
complaining that descriptors are "busy" when the cookie count goes
backwards due to out of order completion. Add DMA_COMPLETION_NO_ORDER
DMA capability to allow the driver to flag the device's ability to complete
operations out of order.
Reported-by: Swathi Kovvuri <swathi.kovvuri@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Tested-by: Swathi Kovvuri <swathi.kovvuri@intel.com>
Link: https://lore.kernel.org/r/158939557151.20335.12404113976045569870.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
want to transfer a portion of uncompressed data directly to the
display to print it
+- DMA_COMPLETION_NO_ORDER
+
+ - The device does not support in order completion.
+
+ - The driver should return DMA_OUT_OF_ORDER for device_tx_status if
+ the device is setting this capability.
+
+ - All cookie tracking and checking API should be treated as invalid if
+ the device exports this capability.
+
+ - At this point, this is incompatible with polling option for dmatest.
+
+ - If this cap is set, the user is recommended to provide an unique
+ identifier for each descriptor sent to the DMA device in order to
+ properly track the completion.
+
These various types will also affect how the source and destination
addresses change over time.
- In the case of a cyclic transfer, it should only take into
account the current period.
+ - Should return DMA_OUT_OF_ORDER if the device does not support in order
+ completion and is completing the operation out of order.
+
- This function can be called in an interrupt context.
- device_config
result("test timed out", total_tests, src->off, dst->off,
len, 0);
goto error_unmap_continue;
- } else if (status != DMA_COMPLETE) {
+ } else if (status != DMA_COMPLETE &&
+ !(dma_has_cap(DMA_COMPLETION_NO_ORDER,
+ dev->cap_mask) &&
+ status == DMA_OUT_OF_ORDER)) {
result(status == DMA_ERROR ?
"completion error status" :
"completion busy status", total_tests, src->off,
dtc->chan = chan;
INIT_LIST_HEAD(&dtc->threads);
+ if (dma_has_cap(DMA_COMPLETION_NO_ORDER, dma_dev->cap_mask) &&
+ info->params.polled) {
+ info->params.polled = false;
+ pr_warn("DMA_COMPLETION_NO_ORDER, polled disabled\n");
+ }
+
if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) {
if (dmatest == 0) {
cnt = dmatest_add_threads(info, dtc, DMA_MEMCPY);
dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
- return dma_cookie_status(dma_chan, cookie, txstate);
+ return DMA_OUT_OF_ORDER;
}
/*
INIT_LIST_HEAD(&dma->channels);
dma->dev = &idxd->pdev->dev;
+ dma_cap_set(DMA_COMPLETION_NO_ORDER, dma->cap_mask);
dma->device_release = idxd_dma_release;
if (idxd->hw.opcap.bits[0] & IDXD_OPCAP_MEMMOVE) {
DMA_IN_PROGRESS,
DMA_PAUSED,
DMA_ERROR,
+ DMA_OUT_OF_ORDER,
};
/**
DMA_SLAVE,
DMA_CYCLIC,
DMA_INTERLEAVE,
+ DMA_COMPLETION_NO_ORDER,
/* last transaction type for creation of the capabilities mask */
DMA_TX_TYPE_END,
};