[PATCH v2 1/2] pnv/xive2: Add a get_config() method on the presenter class

[Frederic Barrat]

The presenters for xive on P9 and P10 are mostly similar but the
behavior can be tuned through a few CQ registers. This patch adds a
"get_config" method, which will allow to access that config from the
presenter in a later patch.
For now, just define the config for the TIMA version.

Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
---
 hw/intc/pnv_xive.c    | 11 +++++++++++
 hw/intc/pnv_xive2.c   | 12 ++++++++++++
 hw/intc/spapr_xive.c  | 16 ++++++++++++++++
 hw/intc/xive.c        |  7 +++++++
 include/hw/ppc/xive.h |  3 +++
 5 files changed, 49 insertions(+)

diff --git a/hw/intc/pnv_xive.c b/hw/intc/pnv_xive.c
index 622f9d28b7..e536b3ec26 100644
--- a/hw/intc/pnv_xive.c
+++ b/hw/intc/pnv_xive.c
@@ -479,6 +479,16 @@ static int pnv_xive_match_nvt(XivePresenter *xptr, uint8_t 
format,
     return count;
 }
 
+static uint32_t pnv_xive_presenter_get_config(XivePresenter *xptr)
+{
+    uint32_t cfg = 0;
+
+    /* TIMA GEN1 is all P9 knows */
+    cfg |= XIVE_PRESENTER_GEN1_TIMA_OS;
+
+    return cfg;
+}
+
 static uint8_t pnv_xive_get_block_id(XiveRouter *xrtr)
 {
     return pnv_xive_block_id(PNV_XIVE(xrtr));
@@ -1991,6 +2001,7 @@ static void pnv_xive_class_init(ObjectClass *klass, void 
*data)
 
     xnc->notify = pnv_xive_notify;
     xpc->match_nvt  = pnv_xive_match_nvt;
+    xpc->get_config = pnv_xive_presenter_get_config;
 };
 
 static const TypeInfo pnv_xive_info = {
diff --git a/hw/intc/pnv_xive2.c b/hw/intc/pnv_xive2.c
index ec1edeb385..59534f6843 100644
--- a/hw/intc/pnv_xive2.c
+++ b/hw/intc/pnv_xive2.c
@@ -501,6 +501,17 @@ static int pnv_xive2_match_nvt(XivePresenter *xptr, 
uint8_t format,
     return count;
 }
 
+static uint32_t pnv_xive2_presenter_get_config(XivePresenter *xptr)
+{
+    PnvXive2 *xive = PNV_XIVE2(xptr);
+    uint32_t cfg = 0;
+
+    if (xive->cq_regs[CQ_XIVE_CFG >> 3] & CQ_XIVE_CFG_GEN1_TIMA_OS) {
+        cfg |= XIVE_PRESENTER_GEN1_TIMA_OS;
+    }
+    return cfg;
+}
+
 static uint8_t pnv_xive2_get_block_id(Xive2Router *xrtr)
 {
     return pnv_xive2_block_id(PNV_XIVE2(xrtr));
@@ -1987,6 +1998,7 @@ static void pnv_xive2_class_init(ObjectClass *klass, void 
*data)
     xnc->notify    = pnv_xive2_notify;
 
     xpc->match_nvt  = pnv_xive2_match_nvt;
+    xpc->get_config = pnv_xive2_presenter_get_config;
 };
 
 static const TypeInfo pnv_xive2_info = {
diff --git a/hw/intc/spapr_xive.c b/hw/intc/spapr_xive.c
index dc641cc604..8bcab2846c 100644
--- a/hw/intc/spapr_xive.c
+++ b/hw/intc/spapr_xive.c
@@ -475,6 +475,21 @@ static int spapr_xive_match_nvt(XivePresenter *xptr, 
uint8_t format,
     return count;
 }
 
+static uint32_t spapr_xive_presenter_get_config(XivePresenter *xptr)
+{
+    uint32_t cfg = 0;
+
+    /*
+     * Let's claim GEN1 TIMA format. If running with KVM on P10, the
+     * correct answer is deep in the hardware and not accessible to
+     * us.  But it shouldn't matter as it only affects the presenter
+     * as seen by a guest OS.
+     */
+    cfg |= XIVE_PRESENTER_GEN1_TIMA_OS;
+
+    return cfg;
+}
+
 static uint8_t spapr_xive_get_block_id(XiveRouter *xrtr)
 {
     return SPAPR_XIVE_BLOCK_ID;
@@ -832,6 +847,7 @@ static void spapr_xive_class_init(ObjectClass *klass, void 
*data)
     sicc->post_load = spapr_xive_post_load;
 
     xpc->match_nvt  = spapr_xive_match_nvt;
+    xpc->get_config = spapr_xive_presenter_get_config;
     xpc->in_kernel  = spapr_xive_in_kernel_xptr;
 }
 
diff --git a/hw/intc/xive.c b/hw/intc/xive.c
index 5204c14b87..34a868b185 100644
--- a/hw/intc/xive.c
+++ b/hw/intc/xive.c
@@ -461,6 +461,13 @@ static void xive_tm_push_os_ctx(XivePresenter *xptr, 
XiveTCTX *tctx,
     }
 }
 
+static __attribute__((unused)) uint32_t 
xive_presenter_get_config(XivePresenter *xptr)
+{
+    XivePresenterClass *xpc = XIVE_PRESENTER_GET_CLASS(xptr);
+
+    return xpc->get_config(xptr);
+}
+
 /*
  * Define a mapping of "special" operations depending on the TIMA page
  * offset and the size of the operation.
diff --git a/include/hw/ppc/xive.h b/include/hw/ppc/xive.h
index f7eea4ca81..3dfb06e002 100644
--- a/include/hw/ppc/xive.h
+++ b/include/hw/ppc/xive.h
@@ -430,6 +430,8 @@ typedef struct XivePresenterClass XivePresenterClass;
 DECLARE_CLASS_CHECKERS(XivePresenterClass, XIVE_PRESENTER,
                        TYPE_XIVE_PRESENTER)
 
+#define XIVE_PRESENTER_GEN1_TIMA_OS     0x1
+
 struct XivePresenterClass {
     InterfaceClass parent;
     int (*match_nvt)(XivePresenter *xptr, uint8_t format,
@@ -437,6 +439,7 @@ struct XivePresenterClass {
                      bool cam_ignore, uint8_t priority,
                      uint32_t logic_serv, XiveTCTXMatch *match);
     bool (*in_kernel)(const XivePresenter *xptr);
+    uint32_t (*get_config)(XivePresenter *xptr);
 };
 
 int xive_presenter_tctx_match(XivePresenter *xptr, XiveTCTX *tctx,
-- 
2.41.0