qemu: add tpm string section to qemu acpi table

This will create _STR and _UID section for TPM in qemu acpi table,
with these section, the missing "description" and "uid" files will
be created for TPM in /sys by kernel.

Signed-off-by: Liwei Song <liwei.song@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 84 insertions, 0 deletions

diff --git a/meta/recipes-devtools/qemu/qemu.inc b/meta/recipes-devtools/qemu/qemu.inc
index 94190b52f4..cbbb99f611 100644
--- a/meta/recipes-devtools/qemu/qemu.inc
+++ b/meta/recipes-devtools/qemu/qemu.inc
@@ -27,6 +27,7 @@ SRC_URI = "https://download.qemu.org/${BPN}-${PV}.tar.xz \
            file://determinism.patch \
            file://0001-tests-meson.build-use-relative-path-to-refer-to-file.patch \
            file://0001-riscv-Set-5.4-as-minimum-kernel-version-for-riscv32.patch \
+           file://0001-acpi-tpm-Add-missing-device-identification-objects.patch \
            "
 UPSTREAM_CHECK_REGEX = "qemu-(?P<pver>\d+(\.\d+)+)\.tar"
 
diff --git a/meta/recipes-devtools/qemu/qemu/0001-acpi-tpm-Add-missing-device-identification-objects.patch b/meta/recipes-devtools/qemu/qemu/0001-acpi-tpm-Add-missing-device-identification-objects.patch
new file mode 100644
index 0000000000..ff91674879
--- /dev/null
+++ b/meta/recipes-devtools/qemu/qemu/0001-acpi-tpm-Add-missing-device-identification-objects.patch
@@ -0,0 +1,83 @@
+From 5903646d3913af6544680f6645fcb7296d0b3a1c Mon Sep 17 00:00:00 2001
+From: Stefan Berger <stefanb@linux.ibm.com>
+Date: Tue, 4 Jan 2022 12:58:05 -0500
+Subject: [PATCH] acpi: tpm: Add missing device identification objects
+
+Add missing TPM device identification objects _STR and _UID. They will
+appear as files 'description' and 'uid' under Linux sysfs.
+
+Following inspection of sysfs entries for hardware TPMs we chose
+uid '1'.
+
+Upstream-Status: Backport [5903646d3913af6544680f6645fcb7296d0b3a1c]
+
+Cc: Shannon Zhao <shannon.zhaosl@gmail.com>
+Cc: Michael S. Tsirkin <mst@redhat.com>
+Cc: Igor Mammedov <imammedo@redhat.com>
+Cc: Ani Sinha <ani@anisinha.ca>
+Resolves: https://gitlab.com/qemu-project/qemu/-/issues/708
+Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
+Reviewed-by: Ani Sinha <ani@anisinha.ca>
+Reviewed-by: Shannon Zhao <shannon.zhaosl@gmail.com>
+Message-id: 20211223022310.575496-3-stefanb@linux.ibm.com
+Message-Id: <20220104175806.872996-3-stefanb@linux.ibm.com>
+Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
+Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
+Reviewed-by: Igor Mammedov <imammedo@redhat.com>
+Signed-off-by: Liwei Song <liwei.song@windriver.com>
+---
+ hw/arm/virt-acpi-build.c | 1 +
+ hw/i386/acpi-build.c     | 7 +++++++
+ 2 files changed, 8 insertions(+)
+
+diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
+index d0f4867fdfe5..f2514ce77c0b 100644
+--- a/hw/arm/virt-acpi-build.c
++++ b/hw/arm/virt-acpi-build.c
+@@ -229,6 +229,7 @@ static void acpi_dsdt_add_tpm(Aml *scope, VirtMachineState *vms)
+ 
+     Aml *dev = aml_device("TPM0");
+     aml_append(dev, aml_name_decl("_HID", aml_string("MSFT0101")));
++    aml_append(dev, aml_name_decl("_STR", aml_string("TPM 2.0 Device")));
+     aml_append(dev, aml_name_decl("_UID", aml_int(0)));
+ 
+     Aml *crs = aml_resource_template();
+diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
+index 0234fe7588b7..ce823e8fcb97 100644
+--- a/hw/i386/acpi-build.c
++++ b/hw/i386/acpi-build.c
+@@ -1812,11 +1812,15 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
+                     dev = aml_device("TPM");
+                     aml_append(dev, aml_name_decl("_HID",
+                                                   aml_string("MSFT0101")));
++                    aml_append(dev,
++                               aml_name_decl("_STR",
++                                             aml_string("TPM 2.0 Device")));
+                 } else {
+                     dev = aml_device("ISA.TPM");
+                     aml_append(dev, aml_name_decl("_HID",
+                                                   aml_eisaid("PNP0C31")));
+                 }
++                aml_append(dev, aml_name_decl("_UID", aml_int(1)));
+ 
+                 aml_append(dev, aml_name_decl("_STA", aml_int(0xF)));
+                 crs = aml_resource_template();
+@@ -1844,12 +1848,15 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
+     if (TPM_IS_CRB(tpm)) {
+         dev = aml_device("TPM");
+         aml_append(dev, aml_name_decl("_HID", aml_string("MSFT0101")));
++        aml_append(dev, aml_name_decl("_STR",
++                                      aml_string("TPM 2.0 Device")));
+         crs = aml_resource_template();
+         aml_append(crs, aml_memory32_fixed(TPM_CRB_ADDR_BASE,
+                                            TPM_CRB_ADDR_SIZE, AML_READ_WRITE));
+         aml_append(dev, aml_name_decl("_CRS", crs));
+ 
+         aml_append(dev, aml_name_decl("_STA", aml_int(0xf)));
++        aml_append(dev, aml_name_decl("_UID", aml_int(1)));
+ 
+         tpm_build_ppi_acpi(tpm, dev);
+ 
+-- 
+2.17.1
+