[Qemu-devel] [PATCH v5 5/6] acpi: Add IPMI table entries

[minyard@acm.org]

From: Corey Minyard <cminyard@mvista.com>

Use the new ACPI table construction tools to create an ACPI
entry for IPMI.  This adds a function called from build_dsdt
to add an DSDT entry for IPMI if IPMI is compiled in and has
registered firmware.  It also adds a dummy function if IPMI
is not compiled in.

This conforms to section "C3-2 Locating IPMI System Interfaces in
ACPI Name Space" in the IPMI 2.0 specification.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
---
 hw/acpi/Makefile.objs  |   2 +
 hw/acpi/ipmi.c         | 114 +++++++++++++++++++++++++++++++++++++++++++++++++
 hw/acpi/noipmi.c       |  14 ++++++
 hw/i386/acpi-build.c   |  10 +++--
 hw/i386/pc_piix.c      |   1 +
 hw/i386/pc_q35.c       |   1 +
 include/hw/acpi/ipmi.h |  22 ++++++++++
 include/hw/i386/pc.h   |   1 +
 8 files changed, 162 insertions(+), 3 deletions(-)
 create mode 100644 hw/acpi/ipmi.c
 create mode 100644 hw/acpi/noipmi.c
 create mode 100644 include/hw/acpi/ipmi.h

diff --git a/hw/acpi/Makefile.objs b/hw/acpi/Makefile.objs
index faee86c..b8d5c84 100644
--- a/hw/acpi/Makefile.objs
+++ b/hw/acpi/Makefile.objs
@@ -6,3 +6,5 @@ obj-$(CONFIG_ACPI_NVDIMM) += nvdimm.o
 common-obj-$(CONFIG_ACPI) += acpi_interface.o
 common-obj-$(CONFIG_ACPI) += bios-linker-loader.o
 common-obj-$(CONFIG_ACPI) += aml-build.o
+common-obj-$(call land,$(CONFIG_ACPI),$(CONFIG_IPMI)) += ipmi.o
+common-obj-$(call land,$(CONFIG_ACPI),$(call lnot,$(CONFIG_IPMI))) += noipmi.o
diff --git a/hw/acpi/ipmi.c b/hw/acpi/ipmi.c
new file mode 100644
index 0000000..3d61550
--- /dev/null
+++ b/hw/acpi/ipmi.c
@@ -0,0 +1,114 @@
+/*
+ * IPMI ACPI firmware handling
+ *
+ * Copyright (c) 2015 Corey Minyard, MontaVista Software, LLC
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "hw/ipmi/ipmi.h"
+#include "hw/acpi/aml-build.h"
+#include "hw/acpi/acpi.h"
+#include "hw/acpi/ipmi.h"
+
+static Aml *aml_ipmi_crs(IPMIFwInfo *info, const char *scope)
+{
+    Aml *crs = aml_resource_template();
+    uint8_t regspacing = info->register_spacing;
+
+    /*
+     * The base address is fixed and cannot change.  That may be different
+     * if someone does PCI, but we aren't there yet.
+     */
+    switch (info->memspace) {
+    case IPMI_MEMSPACE_IO:
+        aml_append(crs, aml_io(AML_DECODE16, info->base_address,
+                               info->base_address + info->register_length - 1,
+                               regspacing, info->register_length));
+        break;
+    case IPMI_MEMSPACE_MEM32:
+        aml_append(crs,
+                   aml_dword_memory(AML_POS_DECODE,
+                            AML_MIN_FIXED, AML_MAX_FIXED,
+                            AML_NON_CACHEABLE, AML_READ_WRITE,
+                            0xffffffff,
+                            info->base_address,
+                            info->base_address + info->register_length - 1,
+                            regspacing, info->register_length));
+        break;
+    case IPMI_MEMSPACE_MEM64:
+        aml_append(crs,
+                   aml_qword_memory(AML_POS_DECODE,
+                            AML_MIN_FIXED, AML_MAX_FIXED,
+                            AML_NON_CACHEABLE, AML_READ_WRITE,
+                            0xffffffffffffffffULL,
+                            info->base_address,
+                            info->base_address + info->register_length - 1,
+                            regspacing, info->register_length));
+        break;
+    case IPMI_MEMSPACE_SMBUS:
+        aml_append(crs, aml_return(aml_int(info->base_address)));
+        break;
+    default:
+        abort();
+    }
+
+    if (info->interrupt_number) {
+        aml_append(crs, aml_irq_no_flags(info->interrupt_number));
+    }
+
+    return crs;
+}
+
+static void ipmi_encode_one_acpi(Aml *table, IPMIFwInfo *info,
+                                 const char *resource)
+{
+    Aml *dev, *method;
+    uint16_t version = ((info->ipmi_spec_major_revision << 8)
+                        | (info->ipmi_spec_minor_revision << 4));
+
+    dev = aml_device("MI0");
+    aml_append(dev, aml_name_decl("_HID", aml_eisaid("IPI0001")));
+    aml_append(dev, aml_name_decl("_STR", aml_string("ipmi_%s",
+                                                     info->interface_name)));
+    aml_append(dev, aml_name_decl("_UID", aml_int(info->uuid)));
+    aml_append(dev, aml_name_decl("_CRS", aml_ipmi_crs(info, resource)));
+
+    /*
+     * The spec seems to require these to be methods.  All the examples
+     * show them this way and it doesn't seem to work if they are not.
+     */
+    method = aml_method("_IFT", 0, AML_NOTSERIALIZED);
+    aml_append(method, aml_return(aml_int(info->interface_type)));
+    aml_append(dev, method);
+    method = aml_method("_SRV", 0, AML_NOTSERIALIZED);
+    aml_append(method, aml_return(aml_int(version)));
+    aml_append(dev, method);
+
+    aml_append(table, dev);
+}
+
+void acpi_add_ipmi(Aml *table, BusState *bus, const char *resource)
+{
+    BusChild *kid;
+
+    QTAILQ_FOREACH(kid, &bus->children,  sibling) {
+        DeviceState *dev = kid->child;
+        Object *obj = object_dynamic_cast(OBJECT(dev), TYPE_IPMI_INTERFACE);
+        IPMIInterface *ii;
+        IPMIInterfaceClass *iic;
+        IPMIFwInfo info;
+
+        if (!obj) {
+            continue;
+        }
+
+        ii = IPMI_INTERFACE(obj);
+        iic = IPMI_INTERFACE_GET_CLASS(obj);
+        memset(&info, 0, sizeof(info));
+        iic->get_fwinfo(ii, &info);
+        ipmi_encode_one_acpi(table, &info, resource);
+    }
+}
diff --git a/hw/acpi/noipmi.c b/hw/acpi/noipmi.c
new file mode 100644
index 0000000..dd7590d
--- /dev/null
+++ b/hw/acpi/noipmi.c
@@ -0,0 +1,14 @@
+/*
+ * IPMI ACPI firmware handling
+ *
+ * Copyright (c) 2015 Corey Minyard, MontaVista Software, LLC
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "hw/acpi/ipmi.h"
+
+void acpi_add_ipmi(Aml *table, BusState *bus, const char *resource)
+{
+}
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 279f0d7..101082d 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -59,6 +59,8 @@
 #include "qapi/qmp/qint.h"
 #include "qom/qom-qobject.h"
 
+#include "hw/acpi/ipmi.h"
+
 /* These are used to size the ACPI tables for -M pc-i440fx-1.7 and
  * -M pc-i440fx-2.0.  Even if the actual amount of AML generated grows
  * a little bit, there should be plenty of free space since the DSDT
@@ -1445,7 +1447,7 @@ static Aml *build_com_device_aml(uint8_t uid)
     return dev;
 }
 
-static void build_isa_devices_aml(Aml *table)
+static void build_isa_devices_aml(Aml *table, ISABus *isa_bus)
 {
     ISADevice *fdc = pc_find_fdc0();
 
@@ -1461,6 +1463,8 @@ static void build_isa_devices_aml(Aml *table)
     aml_append(scope, build_com_device_aml(1));
     aml_append(scope, build_com_device_aml(2));
 
+    acpi_add_ipmi(scope, BUS(isa_bus), "\\_SB.PCI0.ISA");
+
     aml_append(table, scope);
 }
 
@@ -2011,7 +2015,7 @@ build_dsdt(GArray *table_data, GArray *linker,
         build_hpet_aml(dsdt);
         build_piix4_pm(dsdt);
         build_piix4_isa_bridge(dsdt);
-        build_isa_devices_aml(dsdt);
+        build_isa_devices_aml(dsdt, pcms->isa_bus);
         build_piix4_pci_hotplug(dsdt);
         build_piix4_pci0_int(dsdt);
     } else {
@@ -2039,7 +2043,7 @@ build_dsdt(GArray *table_data, GArray *linker,
 
         build_hpet_aml(dsdt);
         build_q35_isa_bridge(dsdt);
-        build_isa_devices_aml(dsdt);
+        build_isa_devices_aml(dsdt, pcms->isa_bus);
         build_q35_pci0_int(dsdt);
     }
 
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 7f50116..2e5ff45 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -185,6 +185,7 @@ static void pc_init1(MachineState *machine,
                               &error_abort);
         no_hpet = 1;
     }
+    pcms->isa_bus = isa_bus;
     isa_bus_irqs(isa_bus, gsi);
 
     if (kvm_pic_in_kernel()) {
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index 04aae89..027655b 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -190,6 +190,7 @@ static void pc_q35_init(MachineState *machine)
                  ICH9_LPC_NB_PIRQS);
     pci_bus_set_route_irq_fn(host_bus, ich9_route_intx_pin_to_irq);
     isa_bus = ich9_lpc->isa_bus;
+    pcms->isa_bus = isa_bus;
 
     /*end early*/
     isa_bus_irqs(isa_bus, gsi);
diff --git a/include/hw/acpi/ipmi.h b/include/hw/acpi/ipmi.h
new file mode 100644
index 0000000..67d6e2f
--- /dev/null
+++ b/include/hw/acpi/ipmi.h
@@ -0,0 +1,22 @@
+/*
+ * QEMU IPMI ACPI handling
+ *
+ * Copyright (c) 2015 Corey Minyard <cminyard@mvista.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+#ifndef HW_ACPI_IPMI_H
+#define HW_ACPI_IPMI_H
+
+#include "qemu/osdep.h"
+#include "hw/acpi/aml-build.h"
+
+/*
+ * Add ACPI IPMI entries for all registered IPMI devices whose parent
+ * bus matches the given bus.  The resource is the ACPI resource that
+ * contains the IPMI device, this is required for the I2C CRS.
+ */
+void acpi_add_ipmi(Aml *table, BusState *bus, const char *resource);
+
+#endif /* HW_ACPI_IPMI_H */
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 96f0b66..aa8bc97 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -51,6 +51,7 @@ struct PCMachineState {
     HotplugHandler *acpi_dev;
     ISADevice *rtc;
     PCIBus *bus;
+    ISABus *isa_bus;
     FWCfgState *fw_cfg;
 
     /* Configuration options: */
-- 
2.7.4