From 2f431ba908d2ef05da478d10925207728f1ff483 Mon Sep 17 00:00:00 2001 From: Dave Jiang Date: Fri, 7 Apr 2023 13:31:31 -0700 Subject: dmaengine: idxd: add interrupt handling for event log An event log interrupt is raised in the misc interrupt INTCAUSE register when an event is written by the hardware. Add basic event log processing support to the interrupt handler. The event log is a ring where the hardware owns the tail and the software owns the head. The hardware will advance the tail index when an additional event has been pushed to memory. The software will process the log entry and then advances the head. The log is full when (tail + 1) % log_size = head. The hardware will stop writing when the log is full. The user is expected to create a log size large enough to handle all the expected events. Tested-by: Tony Zhu Signed-off-by: Dave Jiang Co-developed-by: Fenghua Yu Signed-off-by: Fenghua Yu Link: https://lore.kernel.org/r/20230407203143.2189681-5-fenghua.yu@intel.com Signed-off-by: Vinod Koul --- include/uapi/linux/idxd.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/uapi/linux') diff --git a/include/uapi/linux/idxd.h b/include/uapi/linux/idxd.h index 5d05bf12f2bd..0bc8eea18586 100644 --- a/include/uapi/linux/idxd.h +++ b/include/uapi/linux/idxd.h @@ -170,6 +170,7 @@ enum iax_completion_status { #define DSA_COMP_STATUS_MASK 0x7f #define DSA_COMP_STATUS_WRITE 0x80 +#define DSA_COMP_STATUS(status) ((status) & DSA_COMP_STATUS_MASK) struct dsa_hw_desc { uint32_t pasid:20; -- cgit v1.2.3