From: Fenghua Yu <fenghua.yu@intel.com>
To: "Thomas Gleixner" <tglx@linutronix.de>,
"Ingo Molnar" <mingo@redhat.com>, "H Peter Anvin" <hpa@zytor.com>,
"Tony Luck" <tony.luck@intel.com>
Cc: "Chatre, Reinette" <reinette.chatre@intel.com>,
"Xiaochen Shen" <xiaochen.shen@intel.com>,
"Chen Yu" <yu.c.chen@intel.com>,
"linux-kernel" <linux-kernel@vger.kernel.org>,
"x86" <x86@kernel.org>, "Fenghua Yu" <fenghua.yu@intel.com>
Subject: [PATCH 3/9] x86/intel_rdt: Global closid helper to support future fixes
Date: Fri, 14 Sep 2018 13:32:03 -0700 [thread overview]
Message-ID: <1536957129-70380-4-git-send-email-fenghua.yu@intel.com> (raw)
In-Reply-To: <1536957129-70380-1-git-send-email-fenghua.yu@intel.com>
From: Reinette Chatre <reinette.chatre@intel.com>
The number of CLOSIDs supported by a system is the minimum number of
CLOSIDs supported by any of its resources. Care should be taken when
iterating over the CLOSIDs of a resource since it may be that the number
of CLOSIDs supported on the system is less than the number of CLOSIDs
supported by the resource.
Introduce a helper function that can be used to query the number of
CLOSIDs that is supported by all resources, irrespective of how many
CLOSIDs are supported by a particular resource.
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
---
arch/x86/kernel/cpu/intel_rdt.h | 1 +
arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | 7 +++++++
2 files changed, 8 insertions(+)
diff --git a/arch/x86/kernel/cpu/intel_rdt.h b/arch/x86/kernel/cpu/intel_rdt.h
index 8c30772e37ed..b2bbba3c4c7e 100644
--- a/arch/x86/kernel/cpu/intel_rdt.h
+++ b/arch/x86/kernel/cpu/intel_rdt.h
@@ -536,6 +536,7 @@ int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp);
void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp);
struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r);
int update_domains(struct rdt_resource *r, int closid);
+int closids_supported(void);
void closid_free(int closid);
int alloc_rmid(void);
void free_rmid(u32 rmid);
diff --git a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
index 32e8bbdf2400..b372923eb209 100644
--- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
+++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
@@ -97,6 +97,12 @@ void rdt_last_cmd_printf(const char *fmt, ...)
* limited as the number of resources grows.
*/
static int closid_free_map;
+static int closid_free_map_len;
+
+int closids_supported(void)
+{
+ return closid_free_map_len;
+}
static void closid_init(void)
{
@@ -111,6 +117,7 @@ static void closid_init(void)
/* CLOSID 0 is always reserved for the default group */
closid_free_map &= ~1;
+ closid_free_map_len = rdt_min_closid;
}
static int closid_alloc(void)
--
2.19.0
next prev parent reply other threads:[~2018-09-14 20:36 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-14 20:32 [PATCH 0/9] x86/intel_rdt: MBA integration fixes Fenghua Yu
2018-09-14 20:32 ` [PATCH 1/9] x86/intel_rdt: Fix MBA parsing callback Fenghua Yu
2018-09-15 10:13 ` Thomas Gleixner
2018-09-15 22:27 ` Fenghua Yu
2018-09-14 20:32 ` [PATCH 2/9] x86/intel_rdt: Fix size reporting of MBA resource Fenghua Yu
2018-09-14 20:32 ` Fenghua Yu [this message]
2018-09-14 20:32 ` [PATCH 4/9] x86/intel_rdt: Fix invalid mode warning when Fenghua Yu
2018-09-15 4:36 ` Reinette Chatre
2018-09-15 4:47 ` Reinette Chatre
2018-09-15 10:22 ` Thomas Gleixner
2018-09-14 20:32 ` [PATCH 5/9] x86/intel_rdt: Fix unchecked MSR access Fenghua Yu
2018-09-14 20:32 ` [PATCH 6/9] x86/intel_rdt: Do not allow pseudo-locking of MBA resource Fenghua Yu
2018-09-14 20:32 ` [PATCH 7/9] x86/intel_rdt: Fix incorrect loop end condition Fenghua Yu
2018-09-14 20:32 ` [PATCH 8/9] x86/intel_rdt: Fix exclusive mode handling of MBA resource Fenghua Yu
2018-09-14 20:32 ` [PATCH 9/9] x86/intel_rdt: Fix incorrect loop end condition Fenghua Yu
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1536957129-70380-4-git-send-email-fenghua.yu@intel.com \
--to=fenghua.yu@intel.com \
--cc=hpa@zytor.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=reinette.chatre@intel.com \
--cc=tglx@linutronix.de \
--cc=tony.luck@intel.com \
--cc=x86@kernel.org \
--cc=xiaochen.shen@intel.com \
--cc=yu.c.chen@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).