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dmaengine: idxd: Flush all pending descriptors

When used as a dmaengine, the DMA "core" might ask the driver to
terminate all pending requests, when that happens, flush all pending
descriptors.

In this context, flush means removing the requests from the pending
lists, so even if they are completed after, the user is not notified.

Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Link: https://patch.msgid.link/20260121-idxd-fix-flr-on-kernel-queues-v3-v3-5-7ed70658a9d1@intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

authored by

Vinicius Costa Gomes and committed by
Vinod Koul 2a93f574 f019d781

+10
+10
drivers/dma/idxd/dma.c
··· 194 194 kfree(idxd_dma); 195 195 } 196 196 197 + static int idxd_dma_terminate_all(struct dma_chan *c) 198 + { 199 + struct idxd_wq *wq = to_idxd_wq(c); 200 + 201 + idxd_wq_flush_descs(wq); 202 + 203 + return 0; 204 + } 205 + 197 206 int idxd_register_dma_device(struct idxd_device *idxd) 198 207 { 199 208 struct idxd_dma_dev *idxd_dma; ··· 233 224 dma->device_issue_pending = idxd_dma_issue_pending; 234 225 dma->device_alloc_chan_resources = idxd_dma_alloc_chan_resources; 235 226 dma->device_free_chan_resources = idxd_dma_free_chan_resources; 227 + dma->device_terminate_all = idxd_dma_terminate_all; 236 228 237 229 rc = dma_async_device_register(dma); 238 230 if (rc < 0) {