[Qemu-devel] [PATCH v2 4/5] 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         | 117 +++++++++++++++++++++++++++++++++++++++++++++++++
 hw/acpi/noipmi.c       |  14 ++++++
 hw/i386/acpi-build.c   |   4 ++
 include/hw/acpi/ipmi.h |  17 +++++++
 5 files changed, 154 insertions(+)
 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..731f4ad
--- /dev/null
+++ b/hw/acpi/ipmi.c
@@ -0,0 +1,117 @@
+/*
+ * 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)
+{
+    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)
+{
+    Aml *scope, *dev, *method;
+    uint16_t version = ((info->ipmi_spec_major_revision << 8)
+                        | (info->ipmi_spec_minor_revision << 4));
+
+    /*
+     * The ACPI parent is a little bit of a pain.  It could be in
+     * different places depending on the device.  It could be an SMBus,
+     * it could be ISA, it could be PCI, etc.  Only the device really
+     * knows, so it has to pass it in.
+     */
+    if (!info->acpi_parent) {
+        ipmi_debug("device %s not compatible with ACPI, no parent given.",
+                   info->interface_name);
+        return;
+    }
+
+    scope = aml_scope("%s", info->acpi_parent);
+
+    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)));
+
+    /*
+     * 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(scope, dev);
+
+    aml_append(table, scope);
+}
+
+void acpi_add_ipmi(Aml *table)
+{
+    IPMIFwInfo *info = ipmi_first_fwinfo();
+
+    while (info) {
+        ipmi_encode_one_acpi(table, info);
+        info = ipmi_next_fwinfo(info);
+    }
+}
diff --git a/hw/acpi/noipmi.c b/hw/acpi/noipmi.c
new file mode 100644
index 0000000..4aae336
--- /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 *ssdt)
+{
+}
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 6477003..2294e7b 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
@@ -2364,6 +2366,8 @@ build_dsdt(GArray *table_data, GArray *linker,
         aml_append(dsdt, sb_scope);
     }
 
+    acpi_add_ipmi(dsdt);
+
     /* copy AML table into ACPI tables blob and patch header there */
     g_array_append_vals(table_data, dsdt->buf->data, dsdt->buf->len);
     build_header(linker, table_data,
diff --git a/include/hw/acpi/ipmi.h b/include/hw/acpi/ipmi.h
new file mode 100644
index 0000000..4f11a28
--- /dev/null
+++ b/include/hw/acpi/ipmi.h
@@ -0,0 +1,17 @@
+/*
+ * 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"
+
+void acpi_add_ipmi(Aml *ssdt);
+
+#endif /* HW_ACPI_IPMI_H */
-- 
2.7.4