Messages in this thread | | | Date | Tue, 31 Oct 2023 10:57:46 -0500 | Subject | Re: [PATCH v4 1/2] dmaengine: idxd: Protect int_handle field in hw descriptor | From | Lijun Pan <> |
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On 10/30/2023 9:55 PM, 'Guanjun' wrote: > From: Guanjun <guanjun@linux.alibaba.com> > > The int_handle field in hw descriptor should also be protected > by wmb() before possibly triggering a DMA read. > > Fixes: ec0d64231615 (dmaengine: idxd: embed irq_entry in idxd_wq struct)
I think the direct fix is to eb0cf33a91b4 which moves the interrupt handle assignment to idxd_submit_desc() and has a write to desc->hw->int_handle before submission of desc->hw.
Fixes: eb0cf33a91b4 ("dmaengine: idxd: move interrupt handle assignment")
Other than that, Reviewed-by: Lijun Pan <lijun.pan@intel.com>
> Signed-off-by: Guanjun <guanjun@linux.alibaba.com> > Reviewed-by: Dave Jiang <dave.jiang@intel.com> > Reviewed-by: Fenghua Yu <fenghua.yu@intel.com> > --- > drivers/dma/idxd/submit.c | 14 +++++++------- > 1 file changed, 7 insertions(+), 7 deletions(-) > > diff --git a/drivers/dma/idxd/submit.c b/drivers/dma/idxd/submit.c > index c01db23e3333..3f922518e3a5 100644 > --- a/drivers/dma/idxd/submit.c > +++ b/drivers/dma/idxd/submit.c > @@ -182,13 +182,6 @@ int idxd_submit_desc(struct idxd_wq *wq, struct idxd_desc *desc) > > portal = idxd_wq_portal_addr(wq); > > - /* > - * The wmb() flushes writes to coherent DMA data before > - * possibly triggering a DMA read. The wmb() is necessary > - * even on UP because the recipient is a device. > - */ > - wmb(); > - > /* > * Pending the descriptor to the lockless list for the irq_entry > * that we designated the descriptor to. > @@ -199,6 +192,13 @@ int idxd_submit_desc(struct idxd_wq *wq, struct idxd_desc *desc) > llist_add(&desc->llnode, &ie->pending_llist); > } > > + /* > + * The wmb() flushes writes to coherent DMA data before > + * possibly triggering a DMA read. The wmb() is necessary > + * even on UP because the recipient is a device. > + */ > + wmb(); > + > if (wq_dedicated(wq)) { > iosubmit_cmds512(portal, desc->hw, 1); > } else {
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