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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,
	Jamie Iles <jamie@nuviainc.com>,
	D Scott Phillips OS <scott@os.amperecomputing.com>,
	lcherian@marvell.com
Subject: [PATCH v4 23/24] x86/resctrl: Expand resctrl_arch_update_domains()'s msr_param range
Date: Mon, 14 Jun 2021 20:09:40 +0000	[thread overview]
Message-ID: <20210614200941.12383-24-james.morse@arm.com> (raw)
In-Reply-To: <20210614200941.12383-1-james.morse@arm.com>

resctrl_arch_update_domains() specifies the one closid that has
been modified and needs copying to the hardware.
resctrl_arch_update_domains() takes a struct rdt_resource and a
closid as arguments, but copies all the staged configurations
for that closid into the ctrl_val[] array.

resctrl_arch_update_domains() is called once per schema, but
once the resources and domains are merged, the second call of
a L2CODE/L2DATA pair will find no staged configurations, as
they were previously applied. The msr_param of the first call
only has one index, so would only have update the hardware
for the last staged configuration.

To avoid a second round of IPIs when changing L2CODE and L2DATA
in one go, expand the range of the msr_param if multiple staged
configurations are found.

Signed-off-by: James Morse <james.morse@arm.com>
---
No changes since v3.

Changes since v2:
 * This patch is new.
---
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index e384398374da..0a1b878ca0db 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -292,6 +292,7 @@ int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
 		return -ENOMEM;
 
 	mba_sc = is_mba_sc(r);
+	msr_param.res = NULL;
 	list_for_each_entry(d, &r->domains, list) {
 		hw_dom = resctrl_to_arch_dom(d);
 		for (t = 0; t < CDP_NUM_TYPES; t++) {
@@ -303,9 +304,14 @@ int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
 			if (!apply_config(hw_dom, cfg, idx, cpu_mask, mba_sc))
 				continue;
 
-			msr_param.low = idx;
-			msr_param.high = msr_param.low + 1;
-			msr_param.res = r;
+			if (!msr_param.res) {
+				msr_param.low = idx;
+				msr_param.high = msr_param.low + 1;
+				msr_param.res = r;
+			} else {
+				msr_param.low = min(msr_param.low, idx);
+				msr_param.high = max(msr_param.high, idx + 1);
+			}
 		}
 	}
 
-- 
2.30.2


  parent reply	other threads:[~2021-06-14 20:11 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-14 20:09 [PATCH v4 00/24] x86/resctrl: Merge the CDP resources James Morse
2021-06-14 20:09 ` [PATCH v4 01/24] x86/resctrl: Split struct rdt_resource James Morse
2021-06-15 18:07   ` Reinette Chatre
2021-06-14 20:09 ` [PATCH v4 02/24] x86/resctrl: Split struct rdt_domain James Morse
2021-06-15 17:51   ` Babu Moger
2021-06-17 17:02     ` James Morse
2021-06-15 18:07   ` Reinette Chatre
2021-06-14 20:09 ` [PATCH v4 03/24] x86/resctrl: Add a separate schema list for resctrl James Morse
2021-06-15 17:51   ` Babu Moger
2021-06-17 17:02     ` James Morse
2021-06-14 20:09 ` [PATCH v4 04/24] x86/resctrl: Pass the schema in info dir's private pointer James Morse
2021-06-14 20:09 ` [PATCH v4 05/24] x86/resctrl: Label the resources with their configuration type James Morse
2021-06-15 18:08   ` Reinette Chatre
2021-06-14 20:09 ` [PATCH v4 06/24] x86/resctrl: Walk the resctrl schema list instead of an arch list James Morse
2021-06-14 20:09 ` [PATCH v4 07/24] x86/resctrl: Store the effective num_closid in the schema James Morse
2021-06-14 20:09 ` [PATCH v4 08/24] x86/resctrl: Add resctrl_arch_get_num_closid() James Morse
2021-06-14 20:09 ` [PATCH v4 09/24] x86/resctrl: Pass the schema to resctrl filesystem functions James Morse
2021-06-15 18:08   ` Reinette Chatre
2021-06-14 20:09 ` [PATCH v4 10/24] x86/resctrl: Swizzle rdt_resource and resctrl_schema in pseudo_lock_region James Morse
2021-06-14 20:09 ` [PATCH v4 11/24] x86/resctrl: Move the schemata names into struct resctrl_schema James Morse
2021-06-15 18:08   ` Reinette Chatre
2021-06-14 20:09 ` [PATCH v4 12/24] x86/resctrl: Group staged configuration into a separate struct James Morse
2021-06-15 18:08   ` Reinette Chatre
2021-06-14 20:09 ` [PATCH v4 13/24] x86/resctrl: Allow different CODE/DATA configurations to be staged James Morse
2021-06-14 20:09 ` [PATCH v4 14/24] x86/resctrl: Rename update_domains() resctrl_arch_update_domains() James Morse
2021-06-14 20:09 ` [PATCH v4 15/24] x86/resctrl: Add a helper to read a closid's configuration James Morse
2021-06-14 20:09 ` [PATCH v4 16/24] x86/resctrl: Add a helper to read/set the CDP configuration James Morse
2021-06-14 20:09 ` [PATCH v4 17/24] x86/resctrl: Pass configuration type to resctrl_arch_get_config() James Morse
2021-06-14 20:09 ` [PATCH v4 18/24] x86/resctrl: Make ctrlval arrays the same size James Morse
2021-06-15 18:09   ` Reinette Chatre
2021-06-17 17:03     ` James Morse
2021-06-14 20:09 ` [PATCH v4 19/24] x86/resctrl: Apply offset correction when config is staged James Morse
2021-06-14 20:09 ` [PATCH v4 20/24] x86/resctrl: Calculate the index from the configuration type James Morse
2021-06-14 20:09 ` [PATCH v4 21/24] x86/resctrl: Merge the ctrl_val arrays James Morse
2021-06-14 20:09 ` [PATCH v4 22/24] x86/resctrl: Remove rdt_cdp_peer_get() James Morse
2021-06-14 20:09 ` James Morse [this message]
2021-06-14 20:09 ` [PATCH v4 24/24] x86/resctrl: Merge the CDP resources James Morse
2021-06-15 16:16 ` [PATCH v4 00/24] " Reinette Chatre
2021-06-15 16:48   ` James Morse
2021-06-15 17:25     ` Borislav Petkov
2021-06-15 18:05     ` Reinette Chatre
2021-06-17 17:03       ` James Morse
2021-06-15 17:50 ` Babu Moger

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