IBM POWER systems support more than one type of memory management unit
(MMU). The Power ISA 3.0 specification, which applies to P9 and later
CPUs, defined a new Radix MMU which, among other things, allows an
anonymous memory page mapping to be converted into a hugepage mapping
at a specific address. This is a required feature in DPDK so we need
to test the MMU type when POWER systems are used and provide a more
useful error message for the user when running on an unsupported
system.
Bugzilla ID: 1221
Suggested-by: Thomas Monjalon <tho...@monjalon.net>
Signed-off-by: David Christensen <d...@linux.vnet.ibm.com>
---
v3:
* Move test function from "common" tree to "linux"
v2:
* Replace ifdef with arch specific functions
---
lib/eal/arm/meson.build | 1 +
lib/eal/arm/rte_mmu.c | 11 ++++++
lib/eal/linux/eal.c | 8 +++++
lib/eal/linux/eal_linux_private.h | 17 ++++++++++
lib/eal/loongarch/meson.build | 1 +
lib/eal/loongarch/rte_mmu.c | 11 ++++++
lib/eal/ppc/meson.build | 1 +
lib/eal/ppc/rte_mmu.c | 56 +++++++++++++++++++++++++++++++
lib/eal/riscv/meson.build | 1 +
lib/eal/riscv/rte_mmu.c | 11 ++++++
lib/eal/x86/meson.build | 1 +
lib/eal/x86/rte_mmu.c | 11 ++++++
12 files changed, 130 insertions(+)
create mode 100644 lib/eal/arm/rte_mmu.c
create mode 100644 lib/eal/linux/eal_linux_private.h
create mode 100644 lib/eal/loongarch/rte_mmu.c
create mode 100644 lib/eal/ppc/rte_mmu.c
create mode 100644 lib/eal/riscv/rte_mmu.c
create mode 100644 lib/eal/x86/rte_mmu.c
diff --git a/lib/eal/arm/meson.build b/lib/eal/arm/meson.build
index dca1106aaeec..6fba3d6ba7b8 100644
--- a/lib/eal/arm/meson.build
+++ b/lib/eal/arm/meson.build
@@ -7,5 +7,6 @@ sources += files(
'rte_cpuflags.c',
'rte_cycles.c',
'rte_hypervisor.c',
+ 'rte_mmu.c',
'rte_power_intrinsics.c',
)
diff --git a/lib/eal/arm/rte_mmu.c b/lib/eal/arm/rte_mmu.c
new file mode 100644
index 000000000000..3c043be10236
--- /dev/null
+++ b/lib/eal/arm/rte_mmu.c
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright (C) IBM Corporation 2023
+ */
+
+#include <linux/eal_linux_private.h>
+
+bool
+eal_mmu_supported_linux_arch(void)
+{
+ return true;
+}
diff --git a/lib/eal/linux/eal.c b/lib/eal/linux/eal.c
index 5f4b2fb0054a..6f838265b15b 100644
--- a/lib/eal/linux/eal.c
+++ b/lib/eal/linux/eal.c
@@ -44,6 +44,7 @@
#include <telemetry_internal.h>
#include "eal_private.h"
+#include "eal_linux_private.h"
#include "eal_thread.h"
#include "eal_internal_cfg.h"
#include "eal_filesystem.h"
@@ -983,6 +984,13 @@ rte_eal_init(int argc, char **argv)
return -1;
}
+ /* verify if DPDK supported on architecture MMU */
+ if (!eal_mmu_supported_linux_arch()) {
+ rte_eal_init_alert("unsupported MMU type.");
+ rte_errno = ENOTSUP;
+ return -1;
+ }
+
if (!__atomic_compare_exchange_n(&run_once, &has_run, 1, 0,
__ATOMIC_RELAXED, __ATOMIC_RELAXED)) {
rte_eal_init_alert("already called initialization.");
diff --git a/lib/eal/linux/eal_linux_private.h
b/lib/eal/linux/eal_linux_private.h
new file mode 100644
index 000000000000..b7eaac922849
--- /dev/null
+++ b/lib/eal/linux/eal_linux_private.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2023 IBM Corporation
+ */
+
+#ifndef _EAL_LINUX_PRIVATE_H_
+#define _EAL_LINUX_PRIVATE_H_
+
+#include <stdbool.h>
+
+/**
+ * Check for architecture supported MMU.
+ *
+ * This function is private to the EAL for Linux.
+ */
+bool eal_mmu_supported_linux_arch(void);
+
+#endif /* _EAL_LINUX_PRIVATE_H_ */
diff --git a/lib/eal/loongarch/meson.build b/lib/eal/loongarch/meson.build
index 4dcc27babb9b..3acfe6c3bd77 100644
--- a/lib/eal/loongarch/meson.build
+++ b/lib/eal/loongarch/meson.build
@@ -7,5 +7,6 @@ sources += files(
'rte_cpuflags.c',
'rte_cycles.c',
'rte_hypervisor.c',
+ 'rte_mmu.c',
'rte_power_intrinsics.c',
)
diff --git a/lib/eal/loongarch/rte_mmu.c b/lib/eal/loongarch/rte_mmu.c
new file mode 100644
index 000000000000..3c043be10236
--- /dev/null
+++ b/lib/eal/loongarch/rte_mmu.c
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright (C) IBM Corporation 2023
+ */
+
+#include <linux/eal_linux_private.h>
+
+bool
+eal_mmu_supported_linux_arch(void)
+{
+ return true;
+}
diff --git a/lib/eal/ppc/meson.build b/lib/eal/ppc/meson.build
index 71c7ac870da6..eeeaeee240b7 100644
--- a/lib/eal/ppc/meson.build
+++ b/lib/eal/ppc/meson.build
@@ -7,5 +7,6 @@ sources += files(
'rte_cpuflags.c',
'rte_cycles.c',
'rte_hypervisor.c',
+ 'rte_mmu.c',
'rte_power_intrinsics.c',
)
diff --git a/lib/eal/ppc/rte_mmu.c b/lib/eal/ppc/rte_mmu.c
new file mode 100644
index 000000000000..fd762defd72d
--- /dev/null
+++ b/lib/eal/ppc/rte_mmu.c
@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright (C) IBM Corporation 2023
+ */
+
+#include "stdio.h"
+#include "string.h"
+#include "rte_log.h"
+#include <linux/eal_linux_private.h>
+
+bool
+eal_mmu_supported_linux_arch(void)
+{
+ static const char proc_cpuinfo[] = "/proc/cpuinfo";
+ static const char str_mmu[] = "MMU";
+ static const char str_radix[] = "Radix";
+ static const char err_msg[] = "DPDK on PPC64 requires radix-mmu";
+ char buf[512];
+ char *ret = NULL;
+ FILE *f = fopen(proc_cpuinfo, "r");
+
+ if (f == NULL) {
+ RTE_LOG(ERR, EAL, "Cannot open %s\n", proc_cpuinfo);
+ return false;
+ }
+
+ /*
+ * Example "MMU" in /proc/cpuinfo:
+ * ...
+ * model : 8335-GTW
+ * machine : PowerNV 8335-GTW
+ * firmware : OPAL
+ * MMU : Radix
+ * ... or ...
+ * model : IBM,9009-22A
+ * machine : CHRP IBM,9009-22A
+ * MMU : Hash
+ */
+ while (fgets(buf, sizeof(buf), f) != NULL) {
+ ret = strstr(buf, str_mmu);
+ if (ret == NULL)
+ continue;
+ ret += sizeof(str_mmu) - 1;
+ ret = strchr(ret, ':');
+ if (ret == NULL)
+ continue;
+ ret = strstr(ret, str_radix);
+ break;
+ }
+ fclose(f);
+
+ if (ret == NULL) {
+ fprintf(stderr, "EAL: FATAL: %s\n", err_msg);
+ RTE_LOG(ERR, EAL, "%s\n", err_msg);
+ }
+ return (ret != NULL);
+}
diff --git a/lib/eal/riscv/meson.build b/lib/eal/riscv/meson.build
index dca1106aaeec..6fba3d6ba7b8 100644
--- a/lib/eal/riscv/meson.build
+++ b/lib/eal/riscv/meson.build
@@ -7,5 +7,6 @@ sources += files(
'rte_cpuflags.c',
'rte_cycles.c',
'rte_hypervisor.c',
+ 'rte_mmu.c',
'rte_power_intrinsics.c',
)
diff --git a/lib/eal/riscv/rte_mmu.c b/lib/eal/riscv/rte_mmu.c
new file mode 100644
index 000000000000..3c043be10236
--- /dev/null
+++ b/lib/eal/riscv/rte_mmu.c
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright (C) IBM Corporation 2023
+ */
+
+#include <linux/eal_linux_private.h>
+
+bool
+eal_mmu_supported_linux_arch(void)
+{
+ return true;
+}
diff --git a/lib/eal/x86/meson.build b/lib/eal/x86/meson.build
index d33a240e1a98..e08dffa13dcc 100644
--- a/lib/eal/x86/meson.build
+++ b/lib/eal/x86/meson.build
@@ -7,6 +7,7 @@ sources += files(
'rte_cpuflags.c',
'rte_cycles.c',
'rte_hypervisor.c',
+ 'rte_mmu.c',
'rte_spinlock.c',
'rte_power_intrinsics.c',
)
diff --git a/lib/eal/x86/rte_mmu.c b/lib/eal/x86/rte_mmu.c
new file mode 100644
index 000000000000..3c043be10236
--- /dev/null
+++ b/lib/eal/x86/rte_mmu.c
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright (C) IBM Corporation 2023
+ */
+
+#include <linux/eal_linux_private.h>
+
+bool
+eal_mmu_supported_linux_arch(void)
+{
+ return true;
+}
--
2.39.1
