From: "Laszlo Ersek" <lersek@redhat.com>
To: edk2-devel-groups-io <devel@edk2.groups.io>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Igor Mammedov <imammedo@redhat.com>,
Jordan Justen <jordan.l.justen@intel.com>
Subject: [PATCH 3/4] OvmfPkg/IndustryStandard: define FW_CFG_X86_TOPOLOGY structure type
Date: Tue, 8 Oct 2019 13:27:13 +0200 [thread overview]
Message-ID: <20191008112714.6215-4-lersek@redhat.com> (raw)
In-Reply-To: <20191008112714.6215-1-lersek@redhat.com>
pc-q35-4.2+ and pc-i440fx-4.2+ machine types report CPU topology info in
the "etc/x86-smp-topology" fw_cfg file. Add a structure type for parsing
this blob.
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1515
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
---
OvmfPkg/Include/IndustryStandard/QemuFwCfg.h | 22 ++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/OvmfPkg/Include/IndustryStandard/QemuFwCfg.h b/OvmfPkg/Include/IndustryStandard/QemuFwCfg.h
index 7969aba3ca61..fe410d4a3fc2 100644
--- a/OvmfPkg/Include/IndustryStandard/QemuFwCfg.h
+++ b/OvmfPkg/Include/IndustryStandard/QemuFwCfg.h
@@ -95,4 +95,26 @@ typedef struct {
} FW_CFG_DMA_ACCESS;
#pragma pack ()
+//
+// Structure describing the VCPU topology on IA32 and X64, in the fw_cfg file
+// named "etc/x86-smp-topology".
+//
+// All fields are little endian.
+//
+// The number of sockets (aka packages) can be calculated by dividing
+// MaxLogicalProcessors by (DiesPerSocket * CoresPerDie * ThreadsPerCore), and
+// rounding up the quotient.
+//
+// APIC ID field widths and offsets can be derived with the standard method
+// described in "Intel(R) 64 Architecture Processor Topology Enumeration"
+// <http://software.intel.com/en-us/articles/intel-64-architecture-processor-topology-enumeration/>.
+//
+#pragma pack (1)
+typedef struct {
+ UINT32 DiesPerSocket;
+ UINT32 CoresPerDie;
+ UINT32 ThreadsPerCore;
+ UINT32 MaxLogicalProcessors;
+} FW_CFG_X86_TOPOLOGY;
+#pragma pack ()
#endif
--
2.19.1.3.g30247aa5d201
next prev parent reply other threads:[~2019-10-08 11:27 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-08 11:27 [PATCH 0/4] UefiCpuPkg, OvmfPkg: separate PCDs for boot CPU count vs. max CPU count Laszlo Ersek
2019-10-08 11:27 ` [PATCH 1/4] UefiCpuPkg/MpInitLib: honor the platform's boot CPU count in AP detection Laszlo Ersek
2019-10-09 0:57 ` [edk2-devel] " Dong, Eric
2019-10-09 14:55 ` Laszlo Ersek
2019-10-10 2:52 ` Ni, Ray
2019-10-10 7:38 ` Laszlo Ersek
2019-10-10 7:50 ` Ni, Ray
2019-10-10 8:28 ` Laszlo Ersek
2019-10-08 11:27 ` [PATCH 2/4] OvmfPkg/OvmfXen.dsc: remove PcdCpu* dynamic defaults Laszlo Ersek
2019-10-08 13:11 ` [edk2-devel] " Philippe Mathieu-Daudé
2019-10-08 20:27 ` Laszlo Ersek
2019-10-08 11:27 ` Laszlo Ersek [this message]
2019-10-08 11:27 ` [PATCH 4/4] OvmfPkg/PlatformPei: rewrite MaxCpuCountInitialization() for CPU hotplug Laszlo Ersek
2019-10-08 15:06 ` Igor Mammedov
2019-10-08 21:12 ` Laszlo Ersek
2019-10-09 10:23 ` Igor Mammedov
2019-10-09 14:43 ` Laszlo Ersek
2019-10-08 11:35 ` [PATCH 0/4] UefiCpuPkg, OvmfPkg: separate PCDs for boot CPU count vs. max CPU count Ard Biesheuvel
2019-10-08 20:27 ` Laszlo Ersek
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