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dmaengine: idxd: Flush kernel workqueues on Function Level Reset

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When a Function Level Reset (FLR) happens, terminate the pending
descriptors that were issued by in-kernel users and disable the
interrupts associated with those. They will be re-enabled after FLR
finishes.

idxd_wq_flush_desc() is declared on idxd.h because it's going to be
used in by the DMA backend in a future patch.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://patch.msgid.link/20260121-idxd-fix-flr-on-kernel-queues-v3-v3-4-7ed70658a9d1@intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Vinicius Costa Gomes
2026-01-21 10:34:30 -08:00
committed by Vinod Koul
parent d6077df7b7
commit f019d7814b
3 changed files with 39 additions and 0 deletions
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22
drivers/dma/idxd/device.c
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@@ -1339,6 +1339,11 @@ void idxd_wq_free_irq(struct idxd_wq *wq)
free_irq(ie->vector, ie);
idxd_flush_pending_descs(ie);
/* The interrupt might have been already released by FLR */
if (ie->int_handle == INVALID_INT_HANDLE)
return;
if (idxd->request_int_handles)
idxd_device_release_int_handle(idxd, ie->int_handle, IDXD_IRQ_MSIX);
idxd_device_clear_perm_entry(idxd, ie);
@@ -1347,6 +1352,23 @@ void idxd_wq_free_irq(struct idxd_wq *wq)
ie->pasid = IOMMU_PASID_INVALID;
}
void idxd_wq_flush_descs(struct idxd_wq *wq)
{
struct idxd_irq_entry *ie = &wq->ie;
struct idxd_device *idxd = wq->idxd;
guard(mutex)(&wq->wq_lock);
if (wq->state != IDXD_WQ_ENABLED || wq->type != IDXD_WQT_KERNEL)
return;
idxd_flush_pending_descs(ie);
if (idxd->request_int_handles)
idxd_device_release_int_handle(idxd, ie->int_handle, IDXD_IRQ_MSIX);
idxd_device_clear_perm_entry(idxd, ie);
ie->int_handle = INVALID_INT_HANDLE;
}
int idxd_wq_request_irq(struct idxd_wq *wq)
{
struct idxd_device *idxd = wq->idxd;