diff mbox

[v5,21/24] tools: L2 CAT: support get HW info for L2 CAT.

Message ID 1484704967-5609-22-git-send-email-yi.y.sun@linux.intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

Yi Sun Jan. 18, 2017, 2:02 a.m. UTC 
This patch implements xl/xc changes to support get HW info
for L2 CAT.

'xl psr-hwinfo' is updated to show both L3 CAT and L2 CAT
info.

Example(on machine which only supports L2 CAT):
Cache Monitoring Technology (CMT):
Enabled         : 0
Cache Allocation Technology (CAT): L3
libxl: error: libxl_psr.c:100:libxl__psr_cat_log_err_msg: CAT is not enabled on the socket: No such file or directory
Failed to get l3 cat info
Cache Allocation Technology (CAT): L2
Socket ID       : 0
Maximum COS     : 3
CBM length      : 8
Default CBM     : 0xff

Signed-off-by: He Chen <he.chen@linux.intel.com>
Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com>
---
 tools/libxc/include/xenctrl.h |  6 ++---
 tools/libxc/xc_psr.c          | 40 +++++++++++++++++++++++----------
 tools/libxl/libxl.h           |  9 ++++++++
 tools/libxl/libxl_psr.c       | 19 +++++++++++-----
 tools/libxl/libxl_types.idl   |  1 +
 tools/libxl/xl_cmdimpl.c      | 52 +++++++++++++++++++++++++++++++++----------
 6 files changed, 95 insertions(+), 32 deletions(-)

Comments

Dario Faggioli Jan. 18, 2017, 8:33 a.m. UTC | #1 
On Wed, 2017-01-18 at 10:02 +0800, Yi Sun wrote:
> This patch implements xl/xc changes to support get HW info
> for L2 CAT.
> 
> 'xl psr-hwinfo' is updated to show both L3 CAT and L2 CAT
> info.
> 
> Example(on machine which only supports L2 CAT):
> Cache Monitoring Technology (CMT):
> Enabled         : 0
> Cache Allocation Technology (CAT): L3
> libxl: error: libxl_psr.c:100:libxl__psr_cat_log_err_msg: CAT is not
> enabled on the socket: No such file or directory
> Failed to get l3 cat info
> Cache Allocation Technology (CAT): L2
> Socket ID       : 0
> Maximum COS     : 3
> CBM length      : 8
> Default CBM     : 0xff
>
I think we settled, in v4, for not having this awkward error message
showing itself in this way "only" because of (legitimate!) lack of
hardware support for some of the features?

https://lists.xenproject.org/archives/html/xen-devel/2017-01/msg00604.html
https://lists.xenproject.org/archives/html/xen-devel/2017-01/msg00792.html
https://lists.xenproject.org/archives/html/xen-devel/2017-01/msg00797.html

Nevertheless, I've had a look at the code, and it looks good to me.

Regards,
Dario
diff mbox

Patch

diff --git a/tools/libxc/include/xenctrl.h b/tools/libxc/include/xenctrl.h
index 4ab0f57..7ea0c92 100644
--- a/tools/libxc/include/xenctrl.h
+++ b/tools/libxc/include/xenctrl.h
@@ -2626,9 +2626,9 @@  int xc_psr_cat_set_domain_data(xc_interface *xch, uint32_t domid,
 int xc_psr_cat_get_domain_data(xc_interface *xch, uint32_t domid,
                                xc_psr_cat_type type, uint32_t target,
                                uint64_t *data);
-int xc_psr_cat_get_l3_info(xc_interface *xch, uint32_t socket,
-                           uint32_t *cos_max, uint32_t *cbm_len,
-                           bool *cdp_enabled);
+int xc_psr_cat_get_info(xc_interface *xch, uint32_t socket, unsigned int lvl,
+                        uint32_t *cos_max, uint32_t *cbm_len,
+                        bool *cdp_enabled);
 
 int xc_get_cpu_levelling_caps(xc_interface *xch, uint32_t *caps);
 int xc_get_cpu_featureset(xc_interface *xch, uint32_t index,
diff --git a/tools/libxc/xc_psr.c b/tools/libxc/xc_psr.c
index 43b3286..6c61aa5 100644
--- a/tools/libxc/xc_psr.c
+++ b/tools/libxc/xc_psr.c
@@ -317,24 +317,40 @@  int xc_psr_cat_get_domain_data(xc_interface *xch, uint32_t domid,
     return rc;
 }
 
-int xc_psr_cat_get_l3_info(xc_interface *xch, uint32_t socket,
-                           uint32_t *cos_max, uint32_t *cbm_len,
-                           bool *cdp_enabled)
+int xc_psr_cat_get_info(xc_interface *xch, uint32_t socket, unsigned int lvl,
+                        uint32_t *cos_max, uint32_t *cbm_len, bool *cdp_enabled)
 {
-    int rc;
+    int rc = -1;
     DECLARE_SYSCTL;
 
     sysctl.cmd = XEN_SYSCTL_psr_cat_op;
-    sysctl.u.psr_cat_op.cmd = XEN_SYSCTL_PSR_CAT_get_l3_info;
     sysctl.u.psr_cat_op.target = socket;
 
-    rc = xc_sysctl(xch, &sysctl);
-    if ( !rc )
-    {
-        *cos_max = sysctl.u.psr_cat_op.u.l3_info.cos_max;
-        *cbm_len = sysctl.u.psr_cat_op.u.l3_info.cbm_len;
-        *cdp_enabled = sysctl.u.psr_cat_op.u.l3_info.flags &
-                       XEN_SYSCTL_PSR_CAT_L3_CDP;
+    switch ( lvl ) {
+    case 2:
+        sysctl.u.psr_cat_op.cmd = XEN_SYSCTL_PSR_CAT_get_l2_info;
+        rc = xc_sysctl(xch, &sysctl);
+        if ( !rc )
+        {
+            *cos_max = sysctl.u.psr_cat_op.u.l2_info.cos_max;
+            *cbm_len = sysctl.u.psr_cat_op.u.l2_info.cbm_len;
+            *cdp_enabled = false;
+        }
+        break;
+    case 3:
+        sysctl.u.psr_cat_op.cmd = XEN_SYSCTL_PSR_CAT_get_l3_info;
+        rc = xc_sysctl(xch, &sysctl);
+        if ( !rc )
+        {
+            *cos_max = sysctl.u.psr_cat_op.u.l3_info.cos_max;
+            *cbm_len = sysctl.u.psr_cat_op.u.l3_info.cbm_len;
+            *cdp_enabled = sysctl.u.psr_cat_op.u.l3_info.flags &
+                           XEN_SYSCTL_PSR_CAT_L3_CDP;
+        }
+        break;
+    default:
+        errno = EOPNOTSUPP;
+        break;
     }
 
     return rc;
diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h
index 3924464..c75a928 100644
--- a/tools/libxl/libxl.h
+++ b/tools/libxl/libxl.h
@@ -904,6 +904,13 @@  void libxl_mac_copy(libxl_ctx *ctx, libxl_mac *dst, const libxl_mac *src);
  * If this is defined, the Code and Data Prioritization feature is supported.
  */
 #define LIBXL_HAVE_PSR_CDP 1
+
+/*
+ * LIBXL_HAVE_PSR_L2_CAT
+ *
+ * If this is defined, the L2 Cache Allocation Technology feature is supported.
+ */
+#define LIBXL_HAVE_PSR_L2_CAT 1
 #endif
 
 /*
@@ -2166,6 +2173,8 @@  int libxl_psr_cat_get_cbm(libxl_ctx *ctx, uint32_t domid,
  * On success, the function returns an array of elements in 'info',
  * and the length in 'nr'.
  */
+int libxl_psr_cat_get_info(libxl_ctx *ctx, libxl_psr_cat_info **info,
+                           int *nr, unsigned int lvl);
 int libxl_psr_cat_get_l3_info(libxl_ctx *ctx, libxl_psr_cat_info **info,
                               int *nr);
 void libxl_psr_cat_info_list_free(libxl_psr_cat_info *list, int nr);
diff --git a/tools/libxl/libxl_psr.c b/tools/libxl/libxl_psr.c
index ec5c79d..68c45da 100644
--- a/tools/libxl/libxl_psr.c
+++ b/tools/libxl/libxl_psr.c
@@ -352,8 +352,8 @@  int libxl_psr_cat_get_cbm(libxl_ctx *ctx, uint32_t domid,
     return rc;
 }
 
-int libxl_psr_cat_get_l3_info(libxl_ctx *ctx, libxl_psr_cat_info **info,
-                              int *nr)
+int libxl_psr_cat_get_info(libxl_ctx *ctx, libxl_psr_cat_info **info,
+                           int *nr, unsigned int lvl)
 {
     GC_INIT(ctx);
     int rc;
@@ -380,9 +380,8 @@  int libxl_psr_cat_get_l3_info(libxl_ctx *ctx, libxl_psr_cat_info **info,
 
     libxl_for_each_set_bit(socketid, socketmap) {
         ptr[i].id = socketid;
-        if (xc_psr_cat_get_l3_info(ctx->xch, socketid, &ptr[i].cos_max,
-                                   &ptr[i].cbm_len, &ptr[i].cdp_enabled)) {
-            libxl__psr_cat_log_err_msg(gc, errno);
+        if (xc_psr_cat_get_info(ctx->xch, socketid, lvl, &ptr[i].cos_max,
+                                &ptr[i].cbm_len, &ptr[i].cdp_enabled)) {
             rc = ERROR_FAIL;
             free(ptr);
             goto out;
@@ -398,6 +397,16 @@  out:
     return rc;
 }
 
+int libxl_psr_cat_get_l3_info(libxl_ctx *ctx, libxl_psr_cat_info **info,
+                              int *nr)
+{
+    int rc;
+
+    rc = libxl_psr_cat_get_info(ctx, info, nr, 3);
+
+    return rc;
+}
+
 void libxl_psr_cat_info_list_free(libxl_psr_cat_info *list, int nr)
 {
     int i;
diff --git a/tools/libxl/libxl_types.idl b/tools/libxl/libxl_types.idl
index a612d1f..5a401b8 100644
--- a/tools/libxl/libxl_types.idl
+++ b/tools/libxl/libxl_types.idl
@@ -899,6 +899,7 @@  libxl_psr_cbm_type = Enumeration("psr_cbm_type", [
     (1, "L3_CBM"),
     (2, "L3_CBM_CODE"),
     (3, "L3_CBM_DATA"),
+    (4, "L2_CBM"),
     ])
 
 libxl_psr_cat_info = Struct("psr_cat_info", [
diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
index 7e8a8ae..42d6827 100644
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -9331,21 +9331,19 @@  int main_psr_cmt_show(int argc, char **argv)
 }
 #endif
 
-#ifdef LIBXL_HAVE_PSR_CAT
-static int psr_cat_hwinfo(void)
+#if defined(LIBXL_HAVE_PSR_CAT) || defined(LIBXL_HAVE_PSR_L2_CAT)
+static int psr_l3_cat_hwinfo(void)
 {
-    int rc;
-    int i, nr;
+    int rc, nr;
+    unsigned int i;
     uint32_t l3_cache_size;
     libxl_psr_cat_info *info;
 
-    printf("Cache Allocation Technology (CAT):\n");
-
-    rc = libxl_psr_cat_get_l3_info(ctx, &info, &nr);
-    if (rc) {
-        fprintf(stderr, "Failed to get cat info\n");
+    rc = libxl_psr_cat_get_info(ctx, &info, &nr, 3);
+    if (rc)
         return rc;
-    }
+
+    printf("Cache Allocation Technology (CAT): L3\n");
 
     for (i = 0; i < nr; i++) {
         rc = libxl_psr_cmt_get_l3_cache_size(ctx, info[i].id, &l3_cache_size);
@@ -9454,7 +9452,7 @@  static int psr_cat_show(uint32_t domid)
     int rc;
     libxl_psr_cat_info *info;
 
-    rc = libxl_psr_cat_get_l3_info(ctx, &info, &nr);
+    rc = libxl_psr_cat_get_info(ctx, &info, &nr, 3);
     if (rc) {
         fprintf(stderr, "Failed to get cat info\n");
         return rc;
@@ -9471,6 +9469,32 @@  out:
     return rc;
 }
 
+static int psr_l2_cat_hwinfo(void)
+{
+    int rc;
+    unsigned int i;
+    int nr;
+    libxl_psr_cat_info *info;
+
+    rc = libxl_psr_cat_get_info(ctx, &info, &nr, 2);
+    if (rc)
+        return rc;
+
+    printf("Cache Allocation Technology (CAT): L2\n");
+
+    for (i = 0; i < nr; i++) {
+        /* There is no CMT on L2 cache so far. */
+        printf("%-16s: %u\n", "Socket ID", info[i].id);
+        printf("%-16s: %u\n", "Maximum COS", info[i].cos_max);
+        printf("%-16s: %u\n", "CBM length", info[i].cbm_len);
+        printf("%-16s: %#llx\n", "Default CBM",
+               (1ull << info[i].cbm_len) - 1);
+    }
+
+    libxl_psr_cat_info_list_free(info, nr);
+    return rc;
+}
+
 int main_psr_cat_cbm_set(int argc, char **argv)
 {
     uint32_t domid;
@@ -9588,7 +9612,11 @@  int main_psr_hwinfo(int argc, char **argv)
         ret = psr_cmt_hwinfo();
 
     if (!ret && (all || cat))
-        ret = psr_cat_hwinfo();
+        ret = psr_l3_cat_hwinfo();
+
+    /* L2 CAT is independent of CMT and L3 CAT */
+    if (all || cat)
+        ret = psr_l2_cat_hwinfo();
 
     return ret;
 }