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Message-Id: <20240802172853.22529-14-james.morse@arm.com>
Date: Fri, 2 Aug 2024 17:28:27 +0000
From: James Morse <james.morse@....com>
To: x86@...nel.org,
linux-kernel@...r.kernel.org
Cc: Fenghua Yu <fenghua.yu@...el.com>,
Reinette Chatre <reinette.chatre@...el.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
Borislav Petkov <bp@...en8.de>,
H Peter Anvin <hpa@...or.com>,
Babu Moger <Babu.Moger@....com>,
James Morse <james.morse@....com>,
shameerali.kolothum.thodi@...wei.com,
D Scott Phillips OS <scott@...amperecomputing.com>,
carl@...amperecomputing.com,
lcherian@...vell.com,
bobo.shaobowang@...wei.com,
tan.shaopeng@...itsu.com,
baolin.wang@...ux.alibaba.com,
Jamie Iles <quic_jiles@...cinc.com>,
Xin Hao <xhao@...ux.alibaba.com>,
peternewman@...gle.com,
dfustini@...libre.com,
amitsinght@...vell.com,
David Hildenbrand <david@...hat.com>,
Rex Nie <rex.nie@...uarmicro.com>,
Dave Martin <dave.martin@....com>
Subject: [PATCH v4 13/39] x86/resctrl: Move resctrl types to a separate header
When resctrl is fully factored into core and per-arch code, each arch
will need to use some resctrl common definitions in order to define its
own specializations and helpers. Following conventional practice, it
would be desirable to put the dependent arch definitions in an
<asm/resctrl.h> header that is included by the common <linux/resctrl.h>
header. However, this can make it awkward to avoid a circular
dependency between <linux/resctrl.h> and the arch header.
To avoid such dependencies, move the affected common types and
constants into a new header that does not need to depend on
<linux/resctrl.h> or on the arch headers.
The same logic applies to the monitor-configuration defines, move these
too.
Some kind of enumeration for events is needed between the filesystem
and architecture code. Take the x86 definition as its convenient for
x86.
The definition of enum resctrl_event_id is needed to allow the
architecture code to define resctrl_arch_mon_ctx_alloc() and
resctrl_arch_mon_ctx_free().
The definition of enum resctrl_res_level is needed to allow the
architecture code to define resctrl_arch_set_cdp_enabled() and
resctrl_arch_get_cdp_enabled().
The bits for mbm_local_bytes_config et al are ABI, and must be the same
on all architectures. These are documented in
Documentation/arch/x86/resctrl.rst
The maintainers entry for these headers was missed when resctrl.h was
created. Add a wildcard entry to match both resctrl.h and
resctrl_types.h.
Signed-off-by: James Morse <james.morse@....com>
Tested-by: Carl Worth <carl@...amperecomputing.com> # arm64
---
Change since v3:
* Added header include.
* Corrected lists in the commit message.
Changes since v2:
* Added to the commit message why each of these things is necessary.
* Moved the enum resctrl_conf_type back to resctrl.h - this week arm's
CDP emulation code gets away without this...
Changes since v1:
* [Commit message only] Rewrite commit message to clarify the the
rationale for refactoring the headers in this way.
---
MAINTAINERS | 1 +
arch/x86/include/asm/resctrl.h | 1 +
arch/x86/kernel/cpu/resctrl/internal.h | 24 ------------
include/linux/resctrl.h | 21 +---------
include/linux/resctrl_types.h | 54 ++++++++++++++++++++++++++
5 files changed, 57 insertions(+), 44 deletions(-)
create mode 100644 include/linux/resctrl_types.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 42decde38320..dcdec2cb7b92 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -19203,6 +19203,7 @@ S: Supported
F: Documentation/arch/x86/resctrl*
F: arch/x86/include/asm/resctrl.h
F: arch/x86/kernel/cpu/resctrl/
+F: include/linux/resctrl*.h
F: tools/testing/selftests/resctrl/
READ-COPY UPDATE (RCU)
diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h
index f61382258743..3b225040f617 100644
--- a/arch/x86/include/asm/resctrl.h
+++ b/arch/x86/include/asm/resctrl.h
@@ -6,6 +6,7 @@
#include <linux/jump_label.h>
#include <linux/percpu.h>
+#include <linux/resctrl_types.h>
#include <linux/sched.h>
/*
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 0b2113364caa..d355aa676158 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -32,30 +32,6 @@
*/
#define MBM_CNTR_WIDTH_OFFSET_MAX (62 - MBM_CNTR_WIDTH_BASE)
-/* Reads to Local DRAM Memory */
-#define READS_TO_LOCAL_MEM BIT(0)
-
-/* Reads to Remote DRAM Memory */
-#define READS_TO_REMOTE_MEM BIT(1)
-
-/* Non-Temporal Writes to Local Memory */
-#define NON_TEMP_WRITE_TO_LOCAL_MEM BIT(2)
-
-/* Non-Temporal Writes to Remote Memory */
-#define NON_TEMP_WRITE_TO_REMOTE_MEM BIT(3)
-
-/* Reads to Local Memory the system identifies as "Slow Memory" */
-#define READS_TO_LOCAL_S_MEM BIT(4)
-
-/* Reads to Remote Memory the system identifies as "Slow Memory" */
-#define READS_TO_REMOTE_S_MEM BIT(5)
-
-/* Dirty Victims to All Types of Memory */
-#define DIRTY_VICTIMS_TO_ALL_MEM BIT(6)
-
-/* Max event bits supported */
-#define MAX_EVT_CONFIG_BITS GENMASK(6, 0)
-
/**
* cpumask_any_housekeeping() - Choose any CPU in @mask, preferring those that
* aren't marked nohz_full
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 1eb6dc5b7b79..c8cd6dde91ed 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -6,6 +6,7 @@
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/pid.h>
+#include <linux/resctrl_types.h>
/* CLOSID, RMID value used by the default control group */
#define RESCTRL_RESERVED_CLOSID 0
@@ -37,28 +38,8 @@ enum resctrl_conf_type {
CDP_DATA,
};
-enum resctrl_res_level {
- RDT_RESOURCE_L3,
- RDT_RESOURCE_L2,
- RDT_RESOURCE_MBA,
- RDT_RESOURCE_SMBA,
-
- /* Must be the last */
- RDT_NUM_RESOURCES,
-};
-
#define CDP_NUM_TYPES (CDP_DATA + 1)
-/*
- * Event IDs, the values match those used to program IA32_QM_EVTSEL before
- * reading IA32_QM_CTR on RDT systems.
- */
-enum resctrl_event_id {
- QOS_L3_OCCUP_EVENT_ID = 0x01,
- QOS_L3_MBM_TOTAL_EVENT_ID = 0x02,
- QOS_L3_MBM_LOCAL_EVENT_ID = 0x03,
-};
-
/**
* struct resctrl_staged_config - parsed configuration to be applied
* @new_ctrl: new ctrl value to be loaded
diff --git a/include/linux/resctrl_types.h b/include/linux/resctrl_types.h
new file mode 100644
index 000000000000..51c51a1aabfb
--- /dev/null
+++ b/include/linux/resctrl_types.h
@@ -0,0 +1,54 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2024 Arm Ltd.
+ * Based on arch/x86/kernel/cpu/resctrl/internal.h
+ */
+
+#ifndef __LINUX_RESCTRL_TYPES_H
+#define __LINUX_RESCTRL_TYPES_H
+
+/* Reads to Local DRAM Memory */
+#define READS_TO_LOCAL_MEM BIT(0)
+
+/* Reads to Remote DRAM Memory */
+#define READS_TO_REMOTE_MEM BIT(1)
+
+/* Non-Temporal Writes to Local Memory */
+#define NON_TEMP_WRITE_TO_LOCAL_MEM BIT(2)
+
+/* Non-Temporal Writes to Remote Memory */
+#define NON_TEMP_WRITE_TO_REMOTE_MEM BIT(3)
+
+/* Reads to Local Memory the system identifies as "Slow Memory" */
+#define READS_TO_LOCAL_S_MEM BIT(4)
+
+/* Reads to Remote Memory the system identifies as "Slow Memory" */
+#define READS_TO_REMOTE_S_MEM BIT(5)
+
+/* Dirty Victims to All Types of Memory */
+#define DIRTY_VICTIMS_TO_ALL_MEM BIT(6)
+
+/* Max event bits supported */
+#define MAX_EVT_CONFIG_BITS GENMASK(6, 0)
+
+enum resctrl_res_level {
+ RDT_RESOURCE_L3,
+ RDT_RESOURCE_L2,
+ RDT_RESOURCE_MBA,
+ RDT_RESOURCE_SMBA,
+
+ /* Must be the last */
+ RDT_NUM_RESOURCES,
+};
+
+/*
+ * Event IDs, the values match those used to program IA32_QM_EVTSEL before
+ * reading IA32_QM_CTR on RDT systems.
+ */
+enum resctrl_event_id {
+ QOS_L3_OCCUP_EVENT_ID = 0x01,
+ QOS_L3_MBM_TOTAL_EVENT_ID = 0x02,
+ QOS_L3_MBM_LOCAL_EVENT_ID = 0x03,
+};
+
+#endif /* __LINUX_RESCTRL_TYPES_H */
--
2.39.2
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