[PATCH 2/3] cxl/mbox: Wire up interrupts for background completion

[Davidlohr Bueso <dave@stgolabs.net>]

Notify when the background operation is done.

Signed-off-by: Davidlohr Bueso <dave@stgolabs.net>
---
 hw/cxl/cxl-device-utils.c   | 10 +++++++++-
 hw/cxl/cxl-mailbox-utils.c  | 11 +++++++++++
 include/hw/cxl/cxl_device.h |  1 +
 3 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/hw/cxl/cxl-device-utils.c b/hw/cxl/cxl-device-utils.c
index 4bb4e85dae19..a4a2c6a80004 100644
--- a/hw/cxl/cxl-device-utils.c
+++ b/hw/cxl/cxl-device-utils.c
@@ -272,10 +272,18 @@ static void device_reg_init_common(CXLDeviceState *cxl_dstate)
 
 static void mailbox_reg_init_common(CXLDeviceState *cxl_dstate)
 {
-    /* 2048 payload size, with no interrupt */
+    const uint8_t msi_n = 9;
+
+    /* 2048 payload size */
     ARRAY_FIELD_DP32(cxl_dstate->mbox_reg_state32, CXL_DEV_MAILBOX_CAP,
                      PAYLOAD_SIZE, CXL_MAILBOX_PAYLOAD_SHIFT);
     cxl_dstate->payload_size = CXL_MAILBOX_MAX_PAYLOAD_SIZE;
+    /* irq support */
+    ARRAY_FIELD_DP32(cxl_dstate->mbox_reg_state32, CXL_DEV_MAILBOX_CAP,
+                     BG_INT_CAP, 1);
+    ARRAY_FIELD_DP32(cxl_dstate->mbox_reg_state32, CXL_DEV_MAILBOX_CAP,
+                     MSI_N, msi_n);
+    cxl_dstate->mbox_msi_n = msi_n;
 }
 
 static void memdev_reg_init_common(CXLDeviceState *cxl_dstate) { }
diff --git a/hw/cxl/cxl-mailbox-utils.c b/hw/cxl/cxl-mailbox-utils.c
index 82923bb84eb0..61f0b8d675bc 100644
--- a/hw/cxl/cxl-mailbox-utils.c
+++ b/hw/cxl/cxl-mailbox-utils.c
@@ -8,6 +8,8 @@
  */
 
 #include "qemu/osdep.h"
+#include "hw/pci/msi.h"
+#include "hw/pci/msix.h"
 #include "hw/cxl/cxl.h"
 #include "hw/cxl/cxl_events.h"
 #include "hw/pci/pci.h"
@@ -984,9 +986,18 @@ static void bg_timercb(void *opaque)
     cxl_dstate->mbox_reg_state64[R_CXL_DEV_BG_CMD_STS] = bg_status_reg;
 
     if (cxl_dstate->bg.complete_pct == 100) {
+        CXLType3Dev *ct3d = container_of(cxl_dstate, CXLType3Dev, cxl_dstate);
+        PCIDevice *pdev = &ct3d->parent_obj;
+
         cxl_dstate->bg.starttime = 0;
         /* registers are updated, allow new bg-capable cmds */
         cxl_dstate->bg.runtime = 0;
+
+        if (msix_enabled(pdev)) {
+            msix_notify(pdev, cxl_dstate->mbox_msi_n);
+        } else if (msi_enabled(pdev)) {
+            msi_notify(pdev, cxl_dstate->mbox_msi_n);
+        }
     }
 }
 
diff --git a/include/hw/cxl/cxl_device.h b/include/hw/cxl/cxl_device.h
index dbb8a955723b..f986651b6ead 100644
--- a/include/hw/cxl/cxl_device.h
+++ b/include/hw/cxl/cxl_device.h
@@ -189,6 +189,7 @@ typedef struct cxl_device_state {
     struct {
         MemoryRegion mailbox;
         uint16_t payload_size;
+        uint8_t mbox_msi_n;
         union {
             uint8_t mbox_reg_state[CXL_MAILBOX_REGISTERS_LENGTH];
             uint16_t mbox_reg_state16[CXL_MAILBOX_REGISTERS_LENGTH / 2];
-- 
2.39.2