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ppc/xive2: Add undelivered group interrupt to backlog

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When a group interrupt cannot be delivered, we need to:
- increment the backlog counter for the group in the NVG table
  (if the END is configured to keep a backlog).
- start a broadcast operation to set the LSMFB field on matching CPUs
  which can't take the interrupt now because they're running at too
  high a priority.

[npiggin: squash in fixes from milesg]
[milesg: only load the NVP if the END is !ignore]
[milesg: always broadcast backlog, not only when there are precluded VPs]

Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
Signed-off-by: Michael Kowal <kowal@linux.ibm.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
This commit is contained in:
Frederic Barrat 2025-03-11 11:51:21 +10:00 • committed by Nicholas Piggin
parent 9cb7f6ebed
commit 58fa4433e0
5 changed files with 174 additions and 30 deletions
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5
include/hw/ppc/xive.h
View file

@ -442,6 +442,9 @@ struct XivePresenterClass {
uint32_t logic_serv, XiveTCTXMatch *match);
bool (*in_kernel)(const XivePresenter *xptr);
uint32_t (*get_config)(XivePresenter *xptr);
int (*broadcast)(XivePresenter *xptr,
uint8_t nvt_blk, uint32_t nvt_idx,
uint8_t priority);
};
int xive_presenter_tctx_match(XivePresenter *xptr, XiveTCTX *tctx,
@ -472,6 +475,8 @@ struct XiveFabricClass {
uint8_t nvt_blk, uint32_t nvt_idx,
bool cam_ignore, uint8_t priority,
uint32_t logic_serv, XiveTCTXMatch *match);
int (*broadcast)(XiveFabric *xfb, uint8_t nvt_blk, uint32_t nvt_idx,
uint8_t priority);
};
/*

1
include/hw/ppc/xive2.h
View file

@ -120,6 +120,7 @@ uint64_t xive2_tm_pull_os_ctx(XivePresenter *xptr, XiveTCTX *tctx,
void xive2_tm_pull_os_ctx_ol(XivePresenter *xptr, XiveTCTX *tctx,
hwaddr offset, uint64_t value, unsigned size);
bool xive2_tm_irq_precluded(XiveTCTX *tctx, int ring, uint8_t priority);
void xive2_tm_set_lsmfb(XiveTCTX *tctx, int ring, uint8_t priority);
void xive2_tm_set_hv_target(XivePresenter *xptr, XiveTCTX *tctx,
hwaddr offset, uint64_t value, unsigned size);
void xive2_tm_pull_phys_ctx_ol(XivePresenter *xptr, XiveTCTX *tctx,