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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 3/5] x86: add domctl cmd to set/get CDP code/data CBM
CDP extends CAT and provides the capacity to control L3 code & data
cache. With CDP, one COS correspond to two CMBs(code & data). cbm_type
is added to support distinguish different CBM operation. Besides, new
domctl cmds are introdunced to support set/get CDP CBM. Some CAT
functions to operation CBMs are extended to support CDP.
Signed-off-by: He Chen <he.chen@xxxxxxxxxxxxxxx>
---
xen/arch/x86/domctl.c | 33 +++++++++-
xen/arch/x86/psr.c | 142 ++++++++++++++++++++++++++++++++------------
xen/include/asm-x86/psr.h | 12 +++-
xen/include/public/domctl.h | 4 ++
4 files changed, 150 insertions(+), 41 deletions(-)
diff --git a/xen/arch/x86/domctl.c b/xen/arch/x86/domctl.c
index bf62a88..c2d771e 100644
--- a/xen/arch/x86/domctl.c
+++ b/xen/arch/x86/domctl.c
@@ -1167,12 +1167,41 @@ long arch_do_domctl(
{
case XEN_DOMCTL_PSR_CAT_OP_SET_L3_CBM:
ret = psr_set_l3_cbm(d, domctl->u.psr_cat_op.target,
- domctl->u.psr_cat_op.data);
+ domctl->u.psr_cat_op.data,
+ PSR_CBM_TYPE_L3);
break;
+ case XEN_DOMCTL_PSR_CAT_OP_SET_L3_CODE:
+ ret = psr_set_l3_cbm(d, domctl->u.psr_cat_op.target,
+ domctl->u.psr_cat_op.data,
+ PSR_CBM_TYPE_L3_CODE);
+ break;
+
+ case XEN_DOMCTL_PSR_CAT_OP_SET_L3_DATA:
+ ret = psr_set_l3_cbm(d, domctl->u.psr_cat_op.target,
+ domctl->u.psr_cat_op.data,
+ PSR_CBM_TYPE_L3_DATA);
+ break;
+
+
case XEN_DOMCTL_PSR_CAT_OP_GET_L3_CBM:
ret = psr_get_l3_cbm(d, domctl->u.psr_cat_op.target,
- &domctl->u.psr_cat_op.data);
+ &domctl->u.psr_cat_op.data,
+ PSR_CBM_TYPE_L3);
+ copyback = 1;
+ break;
+
+ case XEN_DOMCTL_PSR_CAT_OP_GET_L3_CODE:
+ ret = psr_get_l3_cbm(d, domctl->u.psr_cat_op.target,
+ &domctl->u.psr_cat_op.data,
+ PSR_CBM_TYPE_L3_CODE);
+ copyback = 1;
+ break;
+
+ case XEN_DOMCTL_PSR_CAT_OP_GET_L3_DATA:
+ ret = psr_get_l3_cbm(d, domctl->u.psr_cat_op.target,
+ &domctl->u.psr_cat_op.data,
+ PSR_CBM_TYPE_L3_DATA);
copyback = 1;
break;
diff --git a/xen/arch/x86/psr.c b/xen/arch/x86/psr.c
index 26596dd..8e92d24 100644
--- a/xen/arch/x86/psr.c
+++ b/xen/arch/x86/psr.c
@@ -285,14 +285,20 @@ int psr_get_cat_l3_info(unsigned int socket, uint32_t
*cbm_len,
return 0;
}
-int psr_get_l3_cbm(struct domain *d, unsigned int socket, uint64_t *cbm)
+int psr_get_l3_cbm(struct domain *d, unsigned int socket,
+ uint64_t *cbm, enum cbm_type type)
{
struct psr_cat_socket_info *info = get_cat_socket_info(socket);
if ( IS_ERR(info) )
return PTR_ERR(info);
- *cbm = info->cos_to_cbm[d->arch.psr_cos_ids[socket]].u.cbm;
+ if ( type == PSR_CBM_TYPE_L3 )
+ *cbm = info->cos_to_cbm[d->arch.psr_cos_ids[socket]].u.cbm;
+ else if ( type == PSR_CBM_TYPE_L3_CODE )
+ *cbm = info->cos_to_cbm[d->arch.psr_cos_ids[socket]].u.cdp.code;
+ else
+ *cbm = info->cos_to_cbm[d->arch.psr_cos_ids[socket]].u.cdp.data;
return 0;
}
@@ -365,10 +371,51 @@ static int write_l3_cbm(unsigned int socket, unsigned int
cos,
return 0;
}
-int psr_set_l3_cbm(struct domain *d, unsigned int socket, uint64_t cbm)
+static int exist_same_cos(struct psr_cat_cbm *map, int cos_max,
+ uint64_t cbm_code, uint64_t cbm_data, bool_t
cdp_enabled)
+{
+ int cos;
+
+ if ( !cdp_enabled )
+ {
+ for ( cos = 0; cos <= cos_max; cos++ )
+ if ( map[cos].ref && map[cos].u.cbm == cbm_code )
+ return cos;
+ }
+ else
+ {
+ for ( cos = 0; cos <= cos_max; cos++ )
+ if ( map[cos].ref && map[cos].u.cdp.code == cbm_code &&
+ map[cos].u.cdp.data == cbm_data )
+ return cos;
+ }
+
+ return -ENOENT;
+}
+
+static int pick_avail_cos(struct psr_cat_cbm *map, int cos_max, int old_cos)
+{
+ int cos;
+
+ /* If old cos is referred only by the domain, then use it. */
+ if ( map[old_cos].ref == 1 )
+ return old_cos;
+
+ /* Then we pick an unused one, never pick 0 */
+ for ( cos = 1; cos <= cos_max; cos++ )
+ if ( map[cos].ref == 0 )
+ return cos;
+
+ return -EOVERFLOW;
+}
+
+int psr_set_l3_cbm(struct domain *d, unsigned int socket,
+ uint64_t cbm, enum cbm_type type)
{
- unsigned int old_cos, cos;
- struct psr_cat_cbm *map, *found = NULL;
+ unsigned int old_cos, cos_max;
+ int cos, ret, need_write = 1;
+ uint64_t cbm_data, cbm_code;
+ struct psr_cat_cbm *map;
struct psr_cat_socket_info *info = get_cat_socket_info(socket);
if ( IS_ERR(info) )
@@ -377,53 +424,74 @@ int psr_set_l3_cbm(struct domain *d, unsigned int socket,
uint64_t cbm)
if ( !psr_check_cbm(info->cbm_len, cbm) )
return -EINVAL;
+ cos_max = info->cos_max;
+ if ( info->cdp_enabled )
+ cos_max = cos_max / 2;
+
old_cos = d->arch.psr_cos_ids[socket];
map = info->cos_to_cbm;
- spin_lock(&info->cbm_lock);
-
- for ( cos = 0; cos <= info->cos_max; cos++ )
+ switch(type)
{
- /* If still not found, then keep unused one. */
- if ( !found && cos != 0 && map[cos].ref == 0 )
- found = map + cos;
- else if ( map[cos].u.cbm == cbm )
- {
- if ( unlikely(cos == old_cos) )
- {
- ASSERT(cos == 0 || map[cos].ref != 0);
- spin_unlock(&info->cbm_lock);
- return 0;
- }
- found = map + cos;
+ case PSR_CBM_TYPE_L3:
+ cbm_code = cbm;
+ cbm_data = cbm;
break;
- }
+ case PSR_CBM_TYPE_L3_CODE:
+ cbm_code = cbm;
+ cbm_data = map[old_cos].u.cdp.data;
+ break;
+ case PSR_CBM_TYPE_L3_DATA:
+ cbm_code = map[old_cos].u.cdp.code;
+ cbm_data = cbm;
+ break;
+ default:
+ return -EINVAL;
}
- /* If old cos is referred only by the domain, then use it. */
- if ( !found && map[old_cos].ref == 1 )
- found = map + old_cos;
-
- if ( !found )
+ spin_lock(&info->cbm_lock);
+ cos = exist_same_cos(map, cos_max, cbm_code, cbm_data, info->cdp_enabled);
+ if ( cos >= 0 )
{
- spin_unlock(&info->cbm_lock);
- return -EOVERFLOW;
+ if ( unlikely(cos == old_cos) )
+ {
+ spin_unlock(&info->cbm_lock);
+ return 0;
+ }
}
-
- cos = found - map;
- if ( found->u.cbm != cbm )
+ else
{
- int ret = write_l3_cbm(socket, cos, cbm, 0, 0);
-
- if ( ret )
+ cos = pick_avail_cos(map, cos_max, old_cos);
+ if ( cos < 0 )
{
spin_unlock(&info->cbm_lock);
- return ret;
+ return -EOVERFLOW;
+ }
+
+ /* We try to avoid writing MSR */
+ if ( info->cdp_enabled )
+ {
+ if ( map[cos].u.cdp.code == cbm_code &&
+ map[cos].u.cdp.data == cbm_data )
+ need_write = 0;
+ }
+ else
+ need_write = map[cos].u.cbm == cbm_code ? 0 : 1;
+
+ if ( need_write )
+ {
+ ret = write_l3_cbm(socket, cos, cbm_code, cbm_data,
info->cdp_enabled);
+ if ( ret )
+ {
+ spin_unlock(&info->cbm_lock);
+ return ret;
+ }
+ map[cos].u.cdp.code = cbm_code;
+ map[cos].u.cdp.data = cbm_data;
}
- found->u.cbm = cbm;
}
- found->ref++;
+ map[cos].ref++;
map[old_cos].ref--;
spin_unlock(&info->cbm_lock);
diff --git a/xen/include/asm-x86/psr.h b/xen/include/asm-x86/psr.h
index 2b79a92..3af4ac2 100644
--- a/xen/include/asm-x86/psr.h
+++ b/xen/include/asm-x86/psr.h
@@ -49,6 +49,12 @@ struct psr_cmt {
struct psr_cmt_l3 l3;
};
+enum cbm_type {
+ PSR_CBM_TYPE_L3 = 1,
+ PSR_CBM_TYPE_L3_CODE = 2,
+ PSR_CBM_TYPE_L3_DATA = 3,
+};
+
extern struct psr_cmt *psr_cmt;
static inline bool_t psr_cmt_enabled(void)
@@ -62,8 +68,10 @@ void psr_ctxt_switch_to(struct domain *d);
int psr_get_cat_l3_info(unsigned int socket, uint32_t *cbm_len,
uint32_t *cos_max, uint8_t *cdp_enabled);
-int psr_get_l3_cbm(struct domain *d, unsigned int socket, uint64_t *cbm);
-int psr_set_l3_cbm(struct domain *d, unsigned int socket, uint64_t cbm);
+int psr_get_l3_cbm(struct domain *d, unsigned int socket,
+ uint64_t *cbm, enum cbm_type type);
+int psr_set_l3_cbm(struct domain *d, unsigned int socket,
+ uint64_t cbm, enum cbm_type type);
int psr_domain_init(struct domain *d);
void psr_domain_free(struct domain *d);
diff --git a/xen/include/public/domctl.h b/xen/include/public/domctl.h
index 675f021..f438cae 100644
--- a/xen/include/public/domctl.h
+++ b/xen/include/public/domctl.h
@@ -1056,6 +1056,10 @@ DEFINE_XEN_GUEST_HANDLE(xen_domctl_monitor_op_t);
struct xen_domctl_psr_cat_op {
#define XEN_DOMCTL_PSR_CAT_OP_SET_L3_CBM 0
#define XEN_DOMCTL_PSR_CAT_OP_GET_L3_CBM 1
+#define XEN_DOMCTL_PSR_CAT_OP_SET_L3_CODE 2
+#define XEN_DOMCTL_PSR_CAT_OP_SET_L3_DATA 3
+#define XEN_DOMCTL_PSR_CAT_OP_GET_L3_CODE 4
+#define XEN_DOMCTL_PSR_CAT_OP_GET_L3_DATA 5
uint32_t cmd; /* IN: XEN_DOMCTL_PSR_CAT_OP_* */
uint32_t target; /* IN */
uint64_t data; /* IN/OUT */
--
1.9.1
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