From: Glenn Miles <mil...@linux.ibm.com>
When an XIVE context is pulled while it has an active, unacknowledged
group interrupt, XIVE will check to see if a context on another thread
can handle the interrupt and, if so, notify that context. If there
are no contexts that can handle the interrupt, then the interrupt is
added to a backlog and XIVE will attempt to escalate the interrupt,
if configured to do so, allowing the higher privileged handler to
activate a context that can handle the original interrupt.
Signed-off-by: Glenn Miles <mil...@linux.ibm.com>
---
hw/intc/xive2.c | 84 +++++++++++++++++++++++++++++++++++--
include/hw/ppc/xive2_regs.h | 3 ++
2 files changed, 83 insertions(+), 4 deletions(-)
diff --git a/hw/intc/xive2.c b/hw/intc/xive2.c
index 0993e792cc..34fc561c9c 100644
--- a/hw/intc/xive2.c
+++ b/hw/intc/xive2.c
@@ -19,6 +19,10 @@
#include "hw/ppc/xive2_regs.h"
#include "trace.h"
+static void xive2_router_end_notify(Xive2Router *xrtr, uint8_t end_blk,
+ uint32_t end_idx, uint32_t end_data,
+ bool redistribute);
+
uint32_t xive2_router_get_config(Xive2Router *xrtr)
{
Xive2RouterClass *xrc = XIVE2_ROUTER_GET_CLASS(xrtr);
@@ -597,6 +601,68 @@ static uint32_t xive2_tctx_hw_cam_line(XivePresenter
*xptr, XiveTCTX *tctx)
return xive2_nvp_cam_line(blk, 1 << tid_shift | (pir & tid_mask));
}
+static void xive2_redistribute(Xive2Router *xrtr, XiveTCTX *tctx,
+ uint8_t nvp_blk, uint32_t nvp_idx, uint8_t ring)
+{
+ uint8_t nsr = tctx->regs[ring + TM_NSR];
+ uint8_t crowd = NVx_CROWD_LVL(nsr);
+ uint8_t group = NVx_GROUP_LVL(nsr);
+ uint8_t nvgc_blk;
+ uint8_t nvgc_idx;
+ uint8_t end_blk;
+ uint32_t end_idx;
+ uint8_t pipr = tctx->regs[ring + TM_PIPR];
+ Xive2Nvgc nvgc;
+ uint8_t prio_limit;
+ uint32_t cfg;
+
+ /* convert crowd/group to blk/idx */
+ if (group > 0) {
+ nvgc_idx = (nvp_idx & (0xffffffff << group)) |
+ ((1 << (group - 1)) - 1);
+ } else {
+ nvgc_idx = nvp_idx;
+ }
+
+ if (crowd > 0) {
+ crowd = (crowd == 3) ? 4 : crowd;
+ nvgc_blk = (nvp_blk & (0xffffffff << crowd)) |
+ ((1 << (crowd - 1)) - 1);
+ } else {
+ nvgc_blk = nvp_blk;
+ }
+
+ /* Use blk/idx to retrieve the NVGC */
+ if (xive2_router_get_nvgc(xrtr, crowd, nvgc_blk, nvgc_idx, &nvgc)) {
+ qemu_log_mask(LOG_GUEST_ERROR, "XIVE: no %s %x/%x\n",
+ crowd ? "NVC" : "NVG", nvgc_blk, nvgc_idx);
+ return;
+ }
+
+ /* retrieve the END blk/idx from the NVGC */
+ end_blk = xive_get_field32(NVGC2_W1_END_BLK, nvgc.w1);
+ end_idx = xive_get_field32(NVGC2_W1_END_IDX, nvgc.w1);
+
+ /* determine number of priorities being used */
+ cfg = xive2_router_get_config(xrtr);
+ if (cfg & XIVE2_EN_VP_GRP_PRIORITY) {
+ prio_limit = 1 << GETFIELD(NVGC2_W1_PSIZE, nvgc.w1);
+ } else {
+ prio_limit = 1 << GETFIELD(XIVE2_VP_INT_PRIO, cfg);
+ }
+
+ /* add priority offset to end index */
+ end_idx += pipr % prio_limit;
+
+ /* trigger the group END */
+ xive2_router_end_notify(xrtr, end_blk, end_idx, 0, true);
+
+ /* clear interrupt indication for the context */
+ tctx->regs[ring + TM_NSR] = 0;
+ tctx->regs[ring + TM_PIPR] = tctx->regs[ring + TM_CPPR];
+ xive_tctx_reset_signal(tctx, ring);
+}
+
static uint64_t xive2_tm_pull_ctx(XivePresenter *xptr, XiveTCTX *tctx,
hwaddr offset, unsigned size, uint8_t ring)
{
@@ -608,6 +674,7 @@ static uint64_t xive2_tm_pull_ctx(XivePresenter *xptr,
XiveTCTX *tctx,
uint8_t cur_ring;
bool valid;
bool do_save;
+ uint8_t nsr;
xive2_cam_decode(cam, &nvp_blk, &nvp_idx, &valid, &do_save);
@@ -624,6 +691,12 @@ static uint64_t xive2_tm_pull_ctx(XivePresenter *xptr,
XiveTCTX *tctx,
memcpy(&tctx->regs[cur_ring + TM_WORD2], &ringw2_new, 4);
}
+ /* Active group/crowd interrupts need to be redistributed */
+ nsr = tctx->regs[ring + TM_NSR];
+ if (xive_nsr_indicates_group_exception(ring, nsr)) {
+ xive2_redistribute(xrtr, tctx, nvp_blk, nvp_idx, ring);
+ }
+
if (xive2_router_get_config(xrtr) & XIVE2_VP_SAVE_RESTORE && do_save) {
xive2_tctx_save_ctx(xrtr, tctx, nvp_blk, nvp_idx, ring);
}
@@ -1352,7 +1425,8 @@ static bool xive2_router_end_es_notify(Xive2Router *xrtr,
uint8_t end_blk,
* message has the same parameters than in the function below.
*/
static void xive2_router_end_notify(Xive2Router *xrtr, uint8_t end_blk,
- uint32_t end_idx, uint32_t end_data)
+ uint32_t end_idx, uint32_t end_data,
+ bool redistribute)
{
Xive2End end;
uint8_t priority;
@@ -1380,7 +1454,7 @@ static void xive2_router_end_notify(Xive2Router *xrtr,
uint8_t end_blk,
return;
}
- if (xive2_end_is_enqueue(&end)) {
+ if (!redistribute && xive2_end_is_enqueue(&end)) {
xive2_end_enqueue(&end, end_data);
/* Enqueuing event data modifies the EQ toggle and index */
xive2_router_write_end(xrtr, end_blk, end_idx, &end, 1);
@@ -1560,7 +1634,8 @@ do_escalation:
xive2_router_end_notify(xrtr,
xive_get_field32(END2_W4_END_BLOCK, end.w4),
xive_get_field32(END2_W4_ESC_END_INDEX, end.w4),
- xive_get_field32(END2_W5_ESC_END_DATA,
end.w5));
+ xive_get_field32(END2_W5_ESC_END_DATA, end.w5),
+ false);
} /* end END adaptive escalation */
else {
@@ -1641,7 +1716,8 @@ void xive2_notify(Xive2Router *xrtr , uint32_t lisn, bool
pq_checked)
xive2_router_end_notify(xrtr,
xive_get_field64(EAS2_END_BLOCK, eas.w),
xive_get_field64(EAS2_END_INDEX, eas.w),
- xive_get_field64(EAS2_END_DATA, eas.w));
+ xive_get_field64(EAS2_END_DATA, eas.w),
+ false);
return;
}
diff --git a/include/hw/ppc/xive2_regs.h b/include/hw/ppc/xive2_regs.h
index 2c535ec0d0..e222038143 100644
--- a/include/hw/ppc/xive2_regs.h
+++ b/include/hw/ppc/xive2_regs.h
@@ -224,6 +224,9 @@ typedef struct Xive2Nvgc {
#define NVGC2_W0_VALID PPC_BIT32(0)
#define NVGC2_W0_PGONEXT PPC_BITMASK32(26, 31)
uint32_t w1;
+#define NVGC2_W1_PSIZE PPC_BITMASK32(0, 1)
+#define NVGC2_W1_END_BLK PPC_BITMASK32(4, 7)
+#define NVGC2_W1_END_IDX PPC_BITMASK32(8, 31)
uint32_t w2;
uint32_t w3;
uint32_t w4;
--
2.47.1
