ppc/pnv: add a XIVE interrupt controller model for POWER9

This is a simple model of the POWER9 XIVE interrupt controller for the
PowerNV machine which only addresses the needs of the skiboot
firmware. The PowerNV model reuses the common XIVE framework developed
for sPAPR as the fundamentals aspects are quite the same. The
difference are outlined below.

The controller initial BAR configuration is performed using the XSCOM
bus from there, MMIO are used for further configuration.

The MMIO regions exposed are :

 - Interrupt controller registers
 - ESB pages for IPIs and ENDs
 - Presenter MMIO (Not used)
 - Thread Interrupt Management Area MMIO, direct and indirect

The virtualization controller MMIO region containing the IPI ESB pages
and END ESB pages is sub-divided into "sets" which map portions of the
VC region to the different ESB pages. These are modeled with custom
address spaces and the XiveSource and XiveENDSource objects are sized
to the maximum allowed by HW. The memory regions are resized at
run-time using the configuration of EDT set translation table provided
by the firmware.

The XIVE virtualization structure tables (EAT, ENDT, NVTT) are now in
the machine RAM and not in the hypervisor anymore. The firmware
(skiboot) configures these tables using Virtual Structure Descriptor
defining the characteristics of each table : SBE, EAS, END and
NVT. These are later used to access the virtual interrupt entries. The
internal cache of these tables in the interrupt controller is updated
and invalidated using a set of registers.

Still to address to complete the model but not fully required is the
support for block grouping. Escalation support will be necessary for
KVM guests.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20190306085032.15744-7-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 93 insertions, 0 deletions

diff --git a/include/hw/ppc/pnv_xive.h b/include/hw/ppc/pnv_xive.h
new file mode 100644
index 0000000000..4fdaa9247d
--- /dev/null
+++ b/include/hw/ppc/pnv_xive.h
@@ -0,0 +1,93 @@
+/*
+ * QEMU PowerPC XIVE interrupt controller model
+ *
+ * Copyright (c) 2017-2019, IBM Corporation.
+ *
+ * This code is licensed under the GPL version 2 or later. See the
+ * COPYING file in the top-level directory.
+ */
+
+#ifndef PPC_PNV_XIVE_H
+#define PPC_PNV_XIVE_H
+
+#include "hw/ppc/xive.h"
+
+struct PnvChip;
+
+#define TYPE_PNV_XIVE "pnv-xive"
+#define PNV_XIVE(obj) OBJECT_CHECK(PnvXive, (obj), TYPE_PNV_XIVE)
+
+#define XIVE_BLOCK_MAX      16
+
+#define XIVE_TABLE_BLK_MAX  16  /* Block Scope Table (0-15) */
+#define XIVE_TABLE_MIG_MAX  16  /* Migration Register Table (1-15) */
+#define XIVE_TABLE_VDT_MAX  16  /* VDT Domain Table (0-15) */
+#define XIVE_TABLE_EDT_MAX  64  /* EDT Domain Table (0-63) */
+
+typedef struct PnvXive {
+    XiveRouter    parent_obj;
+
+    /* Owning chip */
+    struct PnvChip *chip;
+
+    /* XSCOM addresses giving access to the controller registers */
+    MemoryRegion  xscom_regs;
+
+    /* Main MMIO regions that can be configured by FW */
+    MemoryRegion  ic_mmio;
+    MemoryRegion    ic_reg_mmio;
+    MemoryRegion    ic_notify_mmio;
+    MemoryRegion    ic_lsi_mmio;
+    MemoryRegion    tm_indirect_mmio;
+    MemoryRegion  vc_mmio;
+    MemoryRegion  pc_mmio;
+    MemoryRegion  tm_mmio;
+
+    /*
+     * IPI and END address spaces modeling the EDT segmentation in the
+     * VC region
+     */
+    AddressSpace  ipi_as;
+    MemoryRegion  ipi_mmio;
+    MemoryRegion    ipi_edt_mmio;
+
+    AddressSpace  end_as;
+    MemoryRegion  end_mmio;
+    MemoryRegion    end_edt_mmio;
+
+    /* Shortcut values for the Main MMIO regions */
+    hwaddr        ic_base;
+    uint32_t      ic_shift;
+    hwaddr        vc_base;
+    uint32_t      vc_shift;
+    hwaddr        pc_base;
+    uint32_t      pc_shift;
+    hwaddr        tm_base;
+    uint32_t      tm_shift;
+
+    /* Our XIVE source objects for IPIs and ENDs */
+    XiveSource    ipi_source;
+    XiveENDSource end_source;
+
+    /* Interrupt controller registers */
+    uint64_t      regs[0x300];
+
+    /* Can be configured by FW */
+    uint32_t      tctx_chipid;
+
+    /*
+     * Virtual Structure Descriptor tables : EAT, SBE, ENDT, NVTT, IRQ
+     * These are in a SRAM protected by ECC.
+     */
+    uint64_t      vsds[5][XIVE_BLOCK_MAX];
+
+    /* Translation tables */
+    uint64_t      blk[XIVE_TABLE_BLK_MAX];
+    uint64_t      mig[XIVE_TABLE_MIG_MAX];
+    uint64_t      vdt[XIVE_TABLE_VDT_MAX];
+    uint64_t      edt[XIVE_TABLE_EDT_MAX];
+} PnvXive;
+
+void pnv_xive_pic_print_info(PnvXive *xive, Monitor *mon);
+
+#endif /* PPC_PNV_XIVE_H */