1 files changed, 82 insertions, 0 deletions
diff --git a/hw/intc/xive2.c b/hw/intc/xive2.c
index 0248d43e37..8f278f3bf6 100644
--- a/hw/intc/xive2.c
+++ b/hw/intc/xive2.c
@@ -210,6 +210,88 @@ static int xive2_router_get_block_id(Xive2Router *xrtr)
    return xrc->get_block_id(xrtr);
 }
 
+/*
+ * Encode the HW CAM line with 7bit or 8bit thread id. The thread id
+ * width and block id width is configurable at the IC level.
+ *
+ *    chipid << 24 | 0000 0000 0000 0000 1 threadid (7Bit)
+ *    chipid << 24 | 0000 0000 0000 0001 threadid   (8Bit)
+ */
+static uint32_t xive2_tctx_hw_cam_line(XivePresenter *xptr, XiveTCTX *tctx)
+{
+    Xive2Router *xrtr = XIVE2_ROUTER(xptr);
+    CPUPPCState *env = &POWERPC_CPU(tctx->cs)->env;
+    uint32_t pir = env->spr_cb[SPR_PIR].default_value;
+    uint8_t blk = xive2_router_get_block_id(xrtr);
+    uint8_t tid_shift = 7;
+    uint8_t tid_mask = (1 << tid_shift) - 1;
+
+    return xive2_nvp_cam_line(blk, 1 << tid_shift | (pir & tid_mask));
+}
+
+/*
+ * The thread context register words are in big-endian format.
+ */
+int xive2_presenter_tctx_match(XivePresenter *xptr, XiveTCTX *tctx,
+                               uint8_t format,
+                               uint8_t nvt_blk, uint32_t nvt_idx,
+                               bool cam_ignore, uint32_t logic_serv)
+{
+    uint32_t cam =   xive2_nvp_cam_line(nvt_blk, nvt_idx);
+    uint32_t qw3w2 = xive_tctx_word2(&tctx->regs[TM_QW3_HV_PHYS]);
+    uint32_t qw2w2 = xive_tctx_word2(&tctx->regs[TM_QW2_HV_POOL]);
+    uint32_t qw1w2 = xive_tctx_word2(&tctx->regs[TM_QW1_OS]);
+    uint32_t qw0w2 = xive_tctx_word2(&tctx->regs[TM_QW0_USER]);
+
+    /*
+     * TODO (PowerNV): ignore mode. The low order bits of the NVT
+     * identifier are ignored in the "CAM" match.
+     */
+
+    if (format == 0) {
+        if (cam_ignore == true) {
+            /*
+             * F=0 & i=1: Logical server notification (bits ignored at
+             * the end of the NVT identifier)
+             */
+            qemu_log_mask(LOG_UNIMP, "XIVE: no support for LS NVT %x/%x\n",
+                          nvt_blk, nvt_idx);
+            return -1;
+        }
+
+        /* F=0 & i=0: Specific NVT notification */
+
+        /* PHYS ring */
+        if ((be32_to_cpu(qw3w2) & TM2_QW3W2_VT) &&
+            cam == xive2_tctx_hw_cam_line(xptr, tctx)) {
+            return TM_QW3_HV_PHYS;
+        }
+
+        /* HV POOL ring */
+        if ((be32_to_cpu(qw2w2) & TM2_QW2W2_VP) &&
+            cam == xive_get_field32(TM2_QW2W2_POOL_CAM, qw2w2)) {
+            return TM_QW2_HV_POOL;
+        }
+
+        /* OS ring */
+        if ((be32_to_cpu(qw1w2) & TM2_QW1W2_VO) &&
+            cam == xive_get_field32(TM2_QW1W2_OS_CAM, qw1w2)) {
+            return TM_QW1_OS;
+        }
+    } else {
+        /* F=1 : User level Event-Based Branch (EBB) notification */
+
+        /* USER ring */
+        if  ((be32_to_cpu(qw1w2) & TM2_QW1W2_VO) &&
+             (cam == xive_get_field32(TM2_QW1W2_OS_CAM, qw1w2)) &&
+             (be32_to_cpu(qw0w2) & TM2_QW0W2_VU) &&
+             (logic_serv == xive_get_field32(TM2_QW0W2_LOGIC_SERV, qw0w2))) {
+            return TM_QW0_USER;
+        }
+    }
+    return -1;
+}
+
 static void xive2_router_realize(DeviceState *dev, Error **errp)
 {
     Xive2Router *xrtr = XIVE2_ROUTER(dev);