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From: Chao Peng <chao.p.peng@linux.intel.com>
To: xen-devel@lists.xen.org
Cc: keir@xen.org, Ian.Campbell@citrix.com,
	stefano.stabellini@eu.citrix.com, andrew.cooper3@citrix.com,
	dario.faggioli@citrix.com, Ian.Jackson@eu.citrix.com,
	will.auld@intel.com, JBeulich@suse.com, wei.liu2@citrix.com,
	dgdegra@tycho.nsa.gov
Subject: [PATCH v9 07/13] x86: add scheduling support for Intel CAT
Date: Wed,  3 Jun 2015 12:53:04 +0800	[thread overview]
Message-ID: <1433307190-6381-8-git-send-email-chao.p.peng@linux.intel.com> (raw)
In-Reply-To: <1433307190-6381-1-git-send-email-chao.p.peng@linux.intel.com>

On context switch, write the the domain's Class of Service(COS) to MSR
IA32_PQR_ASSOC, to notify hardware to use the new COS.

For performance reason, the COS mask for current cpu is also cached in
the local per-CPU variable.

Signed-off-by: Chao Peng <chao.p.peng@linux.intel.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
---
Changes in v5:
* Remove the need to cache socket.
Changes in v2:
* merge common scheduling changes into scheduling improvement patch.
* use readable expr for psra->cos_mask.
---
 xen/arch/x86/psr.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/psr.c b/xen/arch/x86/psr.c
index fce5bca..daa3c9c 100644
--- a/xen/arch/x86/psr.c
+++ b/xen/arch/x86/psr.c
@@ -35,6 +35,7 @@ struct psr_cat_socket_info {
 
 struct psr_assoc {
     uint64_t val;
+    uint64_t cos_mask;
 };
 
 struct psr_cmt *__read_mostly psr_cmt;
@@ -200,7 +201,16 @@ static inline void psr_assoc_init(void)
 {
     struct psr_assoc *psra = &this_cpu(psr_assoc);
 
-    if ( psr_cmt_enabled() )
+    if ( cat_socket_info )
+    {
+        unsigned int socket = cpu_to_socket(smp_processor_id());
+
+        if ( test_bit(socket, cat_socket_enable) )
+            psra->cos_mask = ((1ull << get_count_order(
+                             cat_socket_info[socket].cos_max)) - 1) << 32;
+    }
+
+    if ( psr_cmt_enabled() || psra->cos_mask )
         rdmsrl(MSR_IA32_PSR_ASSOC, psra->val);
 }
 
@@ -209,6 +219,12 @@ static inline void psr_assoc_rmid(uint64_t *reg, unsigned int rmid)
     *reg = (*reg & ~rmid_mask) | (rmid & rmid_mask);
 }
 
+static inline void psr_assoc_cos(uint64_t *reg, unsigned int cos,
+                                 uint64_t cos_mask)
+{
+    *reg = (*reg & ~cos_mask) | (((uint64_t)cos << 32) & cos_mask);
+}
+
 void psr_ctxt_switch_to(struct domain *d)
 {
     struct psr_assoc *psra = &this_cpu(psr_assoc);
@@ -217,6 +233,11 @@ void psr_ctxt_switch_to(struct domain *d)
     if ( psr_cmt_enabled() )
         psr_assoc_rmid(&reg, d->arch.psr_rmid);
 
+    if ( psra->cos_mask )
+        psr_assoc_cos(&reg, d->arch.psr_cos_ids ?
+                      d->arch.psr_cos_ids[cpu_to_socket(smp_processor_id())] :
+                      0, psra->cos_mask);
+
     if ( reg != psra->val )
     {
         wrmsrl(MSR_IA32_PSR_ASSOC, reg);
-- 
1.9.1

  parent reply	other threads:[~2015-06-03  4:53 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-06-03  4:52 [PATCH v9 00/13] enable Cache Allocation Technology (CAT) for VMs Chao Peng
2015-06-03  4:52 ` [PATCH v9 01/13] x86: add socket_cpumask Chao Peng
2015-06-15 15:59   ` Jan Beulich
2015-06-03  4:52 ` [PATCH v9 02/13] x86: detect and initialize Intel CAT feature Chao Peng
2015-06-15 15:56   ` Jan Beulich
2015-06-03  4:53 ` [PATCH v9 03/13] x86: maintain COS to CBM mapping for each socket Chao Peng
2015-06-15 16:02   ` Jan Beulich
2015-06-23  7:08     ` Chao Peng
2015-06-23  8:27       ` Jan Beulich
2015-06-03  4:53 ` [PATCH v9 04/13] x86: add COS information for each domain Chao Peng
2015-06-16  6:55   ` Jan Beulich
2015-06-03  4:53 ` [PATCH v9 05/13] x86: expose CBM length and COS number information Chao Peng
2015-06-16  6:58   ` Jan Beulich
2015-06-03  4:53 ` [PATCH v9 06/13] x86: dynamically get/set CBM for a domain Chao Peng
2015-06-16  7:08   ` Jan Beulich
2015-06-23  7:19     ` Chao Peng
2015-06-23  8:35       ` Jan Beulich
2015-06-23  9:03         ` Chao Peng
2015-06-23  9:14           ` Jan Beulich
2015-06-03  4:53 ` Chao Peng [this message]
2015-06-03  4:53 ` [PATCH v9 08/13] xsm: add CAT related xsm policies Chao Peng
2015-06-03  4:53 ` [PATCH v9 09/13] tools/libxl: minor name changes for CMT commands Chao Peng
2015-06-03  4:53 ` [PATCH v9 10/13] tools/libxl: add command to show PSR hardware info Chao Peng
2015-06-03  4:53 ` [PATCH v9 11/13] tools/libxl: introduce some socket helpers Chao Peng
2015-06-03  4:53 ` [PATCH v9 12/13] tools: add tools support for Intel CAT Chao Peng
2015-06-03  4:53 ` [PATCH v9 13/13] docs: add xl-psr.markdown Chao Peng

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