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From: James Morse <james.morse@arm.com>
To: x86@kernel.org,
	linux-kernel@vger.kernel.org
Cc: Fenghua Yu <fenghua.yu@intel.com>,
	Reinette Chatre <reinette.chatre@intel.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>,
	Borislav Petkov <bp@alien8.de>,
	H Peter Anvin <hpa@zytor.com>,
	Babu Moger <Babu.Moger@amd.com>,
	James Morse <james.morse@arm.com>,
	shameerali.kolothum.thodi@huawei.com,
	D Scott Phillips OS <scott@os.amperecomputing.com>,
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	lcherian@marvell.com,
	bobo.shaobowang@huawei.com,
	tan.shaopeng@fujitsu.com,
	baolin.wang@linux.alibaba.com,
	Jamie Iles <quic_jiles@quicinc.com>,
	Xin Hao <xhao@linux.alibaba.com>,
	peternewman@google.com,
	dfustini@baylibre.com,
	amitsinght@marvell.com,
	David Hildenbrand <david@redhat.com>,
	Rex Nie <rex.nie@jaguarmicro.com>,
	Dave Martin <dave.martin@arm.com>
Subject: [PATCH v1 17/31] x86/resctrl: Move mbm_cfg_mask to struct rdt_resource
Date: Thu, 21 Mar 2024 16:50:52 +0000
Message-Id: <20240321165106.31602-18-james.morse@arm.com>
In-Reply-To: <20240321165106.31602-1-james.morse@arm.com>
References: <20240321165106.31602-1-james.morse@arm.com>
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The mbm_cfg_mask field lists the bits that user-space can set when
configuring an event. This value is output via the last_cmd_status
file.

Once the filesystem parts of resctrl are moved to live in /fs/, the
struct rdt_hw_resource is inaccessible to the filesystem code. Because
this value is output to user-space, it has to be accessible to the
filesystem code.

Move it to struct rdt_resource.

Signed-off-by: James Morse <james.morse@arm.com>
---
 arch/x86/kernel/cpu/resctrl/internal.h | 3 ---
 arch/x86/kernel/cpu/resctrl/monitor.c  | 2 +-
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 5 ++---
 include/linux/resctrl.h                | 3 +++
 4 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 46370eafb00f..238b81d3f64a 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -371,8 +371,6 @@ struct msr_param {
  * @msr_update:		Function pointer to update QOS MSRs
  * @mon_scale:		cqm counter * mon_scale = occupancy in bytes
  * @mbm_width:		Monitor width, to detect and correct for overflow.
- * @mbm_cfg_mask:	Bandwidth sources that can be tracked when Bandwidth
- *			Monitoring Event Configuration (BMEC) is supported.
  * @cdp_enabled:	CDP state of this resource
  *
  * Members of this structure are either private to the architecture
@@ -387,7 +385,6 @@ struct rdt_hw_resource {
 				 struct rdt_resource *r);
 	unsigned int		mon_scale;
 	unsigned int		mbm_width;
-	unsigned int		mbm_cfg_mask;
 	bool			cdp_enabled;
 };
 
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index ccb85c61b43b..287fb0a5f060 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -1068,7 +1068,7 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 
 		/* Detect list of bandwidth sources that can be tracked */
 		cpuid_count(0x80000020, 3, &eax, &ebx, &ecx, &edx);
-		hw_res->mbm_cfg_mask = ecx & MAX_EVT_CONFIG_BITS;
+		r->mbm_cfg_mask = ecx & MAX_EVT_CONFIG_BITS;
 	}
 
 	r->mon_capable = true;
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index e76018687117..3d3a839eba6b 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1731,7 +1731,6 @@ static void mbm_config_write_domain(struct rdt_resource *r,
 
 static int mon_config_write(struct rdt_resource *r, char *tok, u32 evtid)
 {
-	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 	char *dom_str = NULL, *id_str;
 	unsigned long dom_id, val;
 	struct rdt_domain *d;
@@ -1758,9 +1757,9 @@ static int mon_config_write(struct rdt_resource *r, char *tok, u32 evtid)
 	}
 
 	/* Value from user cannot be more than the supported set of events */
-	if ((val & hw_res->mbm_cfg_mask) != val) {
+	if ((val & r->mbm_cfg_mask) != val) {
 		rdt_last_cmd_printf("Invalid event configuration: max valid mask is 0x%02x\n",
-				    hw_res->mbm_cfg_mask);
+				    r->mbm_cfg_mask);
 		return -EINVAL;
 	}
 
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 975b80102fbe..8a7367d1ce45 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -140,6 +140,8 @@ struct resctrl_membw {
  * @format_str:		Per resource format string to show domain value
  * @evt_list:		List of monitoring events
  * @fflags:		flags to choose base and info files
+ * @mbm_cfg_mask:	Bandwidth sources that can be tracked when Bandwidth
+ *			Monitoring Event Configuration (BMEC) is supported.
  * @cdp_capable:	Is the CDP feature available on this resource
  */
 struct rdt_resource {
@@ -157,6 +159,7 @@ struct rdt_resource {
 	const char		*format_str;
 	struct list_head	evt_list;
 	unsigned long		fflags;
+	unsigned int		mbm_cfg_mask;
 	bool			cdp_capable;
 };
 
-- 
2.39.2