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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH 04/36] xen/arm: add parsing function for cache coloring configuration
From: Luca Miccio <lucmiccio@xxxxxxxxx>
Add three new bootargs allowing configuration of cache coloring support
for Xen:
- way_size: The size of a LLC way in bytes. This value is mainly used
to calculate the maximum available colors on the platform.
- dom0_colors: The coloring configuration for Dom0, which also acts as
default configuration for any DomU without an explicit configuration.
- xen_colors: The coloring configuration for the Xen hypervisor itself.
A cache coloring configuration consists of a selection of colors to be
assigned to a VM or to the hypervisor. It is represented by a set of
ranges. Add a common function that parses a string with a
comma-separated set of hyphen-separated ranges like "0-7,15-16" and
returns both: the number of chosen colors, and an array containing their
ids.
Currently we support platforms with up to 128 colors.
Signed-off-by: Luca Miccio <lucmiccio@xxxxxxxxx>
Signed-off-by: Marco Solieri <marco.solieri@xxxxxxxxxxxxxxx>
Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>
---
xen/arch/arm/Kconfig | 5 ++
xen/arch/arm/Makefile | 2 +-
xen/arch/arm/coloring.c | 131 ++++++++++++++++++++++++++++
xen/arch/arm/include/asm/coloring.h | 28 ++++++
4 files changed, 165 insertions(+), 1 deletion(-)
create mode 100644 xen/arch/arm/coloring.c
create mode 100644 xen/arch/arm/include/asm/coloring.h
diff --git a/xen/arch/arm/Kconfig b/xen/arch/arm/Kconfig
index ecfa6822e4..f0f999d172 100644
--- a/xen/arch/arm/Kconfig
+++ b/xen/arch/arm/Kconfig
@@ -97,6 +97,11 @@ config HARDEN_BRANCH_PREDICTOR
If unsure, say Y.
+config COLORING
+ bool "L2 cache coloring"
+ default n
+ depends on ARM_64
+
config TEE
bool "Enable TEE mediators support (UNSUPPORTED)" if UNSUPPORTED
default n
diff --git a/xen/arch/arm/Makefile b/xen/arch/arm/Makefile
index c993ce72a3..581896a528 100644
--- a/xen/arch/arm/Makefile
+++ b/xen/arch/arm/Makefile
@@ -66,7 +66,7 @@ obj-$(CONFIG_SBSA_VUART_CONSOLE) += vpl011.o
obj-y += vsmc.o
obj-y += vpsci.o
obj-y += vuart.o
-
+obj-$(CONFIG_COLORING) += coloring.o
extra-y += xen.lds
#obj-bin-y += ....o
diff --git a/xen/arch/arm/coloring.c b/xen/arch/arm/coloring.c
new file mode 100644
index 0000000000..8f1cff6efb
--- /dev/null
+++ b/xen/arch/arm/coloring.c
@@ -0,0 +1,131 @@
+/*
+ * xen/arch/arm/coloring.c
+ *
+ * Coloring support for ARM
+ *
+ * Copyright (C) 2019 Xilinx Inc.
+ *
+ * Authors:
+ * Luca Miccio <lucmiccio@xxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <xen/init.h>
+#include <xen/types.h>
+#include <xen/lib.h>
+#include <xen/errno.h>
+#include <xen/param.h>
+#include <asm/coloring.h>
+
+/* Number of color(s) assigned to Xen */
+static uint32_t xen_col_num;
+/* Coloring configuration of Xen as bitmask */
+static uint32_t xen_col_mask[MAX_COLORS_CELLS];
+
+/* Number of color(s) assigned to Dom0 */
+static uint32_t dom0_col_num;
+/* Coloring configuration of Dom0 as bitmask */
+static uint32_t dom0_col_mask[MAX_COLORS_CELLS];
+
+static uint64_t way_size;
+
+/*************************
+ * PARSING COLORING BOOTARGS
+ */
+
+/*
+ * Parse the coloring configuration given in the buf string, following the
+ * syntax below, and store the number of colors and a corresponding mask in
+ * the last two given pointers.
+ *
+ * COLOR_CONFIGURATION ::= RANGE,...,RANGE
+ * RANGE ::= COLOR-COLOR
+ *
+ * Example: "2-6,15-16" represents the set of colors: 2,3,4,5,6,15,16.
+ */
+static int parse_color_config(
+ const char *buf, uint32_t *col_mask, uint32_t *col_num)
+{
+ int start, end, i;
+ const char* s = buf;
+ unsigned int offset;
+
+ if ( !col_mask || !col_num )
+ return -EINVAL;
+
+ *col_num = 0;
+ for ( i = 0; i < MAX_COLORS_CELLS; i++ )
+ col_mask[i] = 0;
+
+ while ( *s != '\0' )
+ {
+ if ( *s != ',' )
+ {
+ start = simple_strtoul(s, &s, 0);
+
+ /* Ranges are hyphen-separated */
+ if ( *s != '-' )
+ goto fail;
+ s++;
+
+ end = simple_strtoul(s, &s, 0);
+
+ for ( i = start; i <= end; i++ )
+ {
+ offset = i / 32;
+ if ( offset > MAX_COLORS_CELLS )
+ goto fail;
+
+ if ( !(col_mask[offset] & (1 << i % 32)) )
+ *col_num += 1;
+ col_mask[offset] |= (1 << i % 32);
+ }
+ }
+ else
+ s++;
+ }
+
+ return *s ? -EINVAL : 0;
+fail:
+ return -EINVAL;
+}
+
+static int __init parse_way_size(const char *s)
+{
+ way_size = simple_strtoull(s, &s, 0);
+
+ return *s ? -EINVAL : 0;
+}
+custom_param("way_size", parse_way_size);
+
+static int __init parse_dom0_colors(const char *s)
+{
+ return parse_color_config(s, dom0_col_mask, &dom0_col_num);
+}
+custom_param("dom0_colors", parse_dom0_colors);
+
+static int __init parse_xen_colors(const char *s)
+{
+ return parse_color_config(s, xen_col_mask, &xen_col_num);
+}
+custom_param("xen_colors", parse_xen_colors);
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/arch/arm/include/asm/coloring.h
b/xen/arch/arm/include/asm/coloring.h
new file mode 100644
index 0000000000..60958d1244
--- /dev/null
+++ b/xen/arch/arm/include/asm/coloring.h
@@ -0,0 +1,28 @@
+/*
+ * xen/arm/include/asm/coloring.h
+ *
+ * Coloring support for ARM
+ *
+ * Copyright (C) 2019 Xilinx Inc.
+ *
+ * Authors:
+ * Luca Miccio <lucmiccio@xxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_ARM_COLORING_H__
+#define __ASM_ARM_COLORING_H__
+
+#define MAX_COLORS_CELLS 4
+
+#endif /* !__ASM_ARM_COLORING_H__ */
--
2.30.2
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