hw/riscv/riscv-iommu: add riscv_iommu_hpm_incr_ctr()

This function will increment a specific counter, generating an interrupt
when an overflow occurs.

Some extra changes in riscv-iommu.c  were required to add this new
helper in riscv-iommu-hpm.c:

- RISCVIOMMUContext was moved to riscv-iommu.h, making it visible in
  riscv-iommu-hpm.c;

- riscv_iommu_notify() is now public.

No behavior change is made since HPM support is not being advertised
yet.

Signed-off-by: Tomasz Jeznach <tjeznach@rivosinc.com>
Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Acked-by: Alistair Francis <alistair.francis@wdc.com>
Message-ID: <20250224190826.1858473-5-dbarboza@ventanamicro.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

hw/riscv/riscv-iommu.h

@@ -85,12 +85,30 @@ struct RISCVIOMMUState {
     /* HPM cycle counter */
     uint64_t hpmcycle_val;      /* Current value of cycle register */
     uint64_t hpmcycle_prev;     /* Saved value of QEMU_CLOCK_VIRTUAL clock */
+
+    /* HPM event counters */
+    GHashTable *hpm_event_ctr_map; /* Mapping of events to counters */
 };
 
 void riscv_iommu_pci_setup_iommu(RISCVIOMMUState *iommu, PCIBus *bus,
          Error **errp);
 void riscv_iommu_set_cap_igs(RISCVIOMMUState *s, riscv_iommu_igs_mode mode);
 void riscv_iommu_reset(RISCVIOMMUState *s);
+void riscv_iommu_notify(RISCVIOMMUState *s, int vec_type);
+
+typedef struct RISCVIOMMUContext RISCVIOMMUContext;
+/* Device translation context state. */
+struct RISCVIOMMUContext {
+    uint64_t devid:24;          /* Requester Id, AKA device_id */
+    uint64_t process_id:20;     /* Process ID. PASID for PCIe */
+    uint64_t tc;                /* Translation Control */
+    uint64_t ta;                /* Translation Attributes */
+    uint64_t satp;              /* S-Stage address translation and protection */
+    uint64_t gatp;              /* G-Stage address translation and protection */
+    uint64_t msi_addr_mask;     /* MSI filtering - address mask */
+    uint64_t msi_addr_pattern;  /* MSI filtering - address pattern */
+    uint64_t msiptp;            /* MSI redirection page table pointer */
+};
 
 /* private helpers */