perf/x86/amd/uncore: Use attr_update for format attributes

Use the update_attrs attribute group introduced by commit
f3a3a825 ("perf/core: Add attr_groups_update into struct
pmu") and the is_visible() callback to populate the family
specifc attributes for uncore events.

The changes apply to attributes that are unique to families
such as slicemask for Family 17h and coreid for Family 19h.
The addition of common attributes such as event and umask,
whose formats change across families, remain unchanged.
Signed-off-by: Sandipan Das <sandipan.das@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/a5e4f4dd5c459199fc497e82b858ba09dc91c064.1652954372.git.sandipan.das@amd.com

arch/x86/events/amd/uncore.c

@@ -246,6 +246,19 @@ static int amd_uncore_event_init(struct perf_event *event)
 	return 0;
 }
 
+static umode_t
+amd_f17h_uncore_is_visible(struct kobject *kobj, struct attribute *attr, int i)
+{
+	return boot_cpu_data.x86 >= 0x17 && boot_cpu_data.x86 < 0x19 ?
+	       attr->mode : 0;
+}
+
+static umode_t
+amd_f19h_uncore_is_visible(struct kobject *kobj, struct attribute *attr, int i)
+{
+	return boot_cpu_data.x86 >= 0x19 ? attr->mode : 0;
+}
+
 static ssize_t amd_uncore_attr_show_cpumask(struct device *dev,
 					    struct device_attribute *attr,
 					    char *buf)
@@ -296,20 +309,33 @@ DEFINE_UNCORE_FORMAT_ATTR(enallslices,	enallslices,	"config:46");		   /* F19h L3
 DEFINE_UNCORE_FORMAT_ATTR(enallcores,	enallcores,	"config:47");		   /* F19h L3 */
 DEFINE_UNCORE_FORMAT_ATTR(sliceid,	sliceid,	"config:48-50");	   /* F19h L3 */
 
+/* Common DF and NB attributes */
 static struct attribute *amd_uncore_df_format_attr[] = {
-	&format_attr_event12.attr, /* event14 if F17h+ */
-	&format_attr_umask.attr,
+	&format_attr_event12.attr,	/* event */
+	&format_attr_umask.attr,	/* umask */
 	NULL,
 };
 
+/* Common L2 and L3 attributes */
 static struct attribute *amd_uncore_l3_format_attr[] = {
-	&format_attr_event12.attr, /* event8 if F17h+ */
-	&format_attr_umask.attr,
-	NULL, /* slicemask if F17h,	coreid if F19h */
-	NULL, /* threadmask8 if F17h,	enallslices if F19h */
-	NULL, /*			enallcores if F19h */
-	NULL, /*			sliceid if F19h */
-	NULL, /*			threadmask2 if F19h */
+	&format_attr_event12.attr,	/* event */
+	&format_attr_umask.attr,	/* umask */
+	NULL,				/* threadmask */
+	NULL,
+};
+
+/* F17h unique L3 attributes */
+static struct attribute *amd_f17h_uncore_l3_format_attr[] = {
+	&format_attr_slicemask.attr,	/* slicemask */
+	NULL,
+};
+
+/* F19h unique L3 attributes */
+static struct attribute *amd_f19h_uncore_l3_format_attr[] = {
+	&format_attr_coreid.attr,	/* coreid */
+	&format_attr_enallslices.attr,	/* enallslices */
+	&format_attr_enallcores.attr,	/* enallcores */
+	&format_attr_sliceid.attr,	/* sliceid */
 	NULL,
 };
 
@@ -323,6 +349,18 @@ static struct attribute_group amd_uncore_l3_format_group = {
 	.attrs = amd_uncore_l3_format_attr,
 };
 
+static struct attribute_group amd_f17h_uncore_l3_format_group = {
+	.name = "format",
+	.attrs = amd_f17h_uncore_l3_format_attr,
+	.is_visible = amd_f17h_uncore_is_visible,
+};
+
+static struct attribute_group amd_f19h_uncore_l3_format_group = {
+	.name = "format",
+	.attrs = amd_f19h_uncore_l3_format_attr,
+	.is_visible = amd_f19h_uncore_is_visible,
+};
+
 static const struct attribute_group *amd_uncore_df_attr_groups[] = {
 	&amd_uncore_attr_group,
 	&amd_uncore_df_format_group,
@@ -335,6 +373,12 @@ static const struct attribute_group *amd_uncore_l3_attr_groups[] = {
 	NULL,
 };
 
+static const struct attribute_group *amd_uncore_l3_attr_update[] = {
+	&amd_f17h_uncore_l3_format_group,
+	&amd_f19h_uncore_l3_format_group,
+	NULL,
+};
+
 static struct pmu amd_nb_pmu = {
 	.task_ctx_nr	= perf_invalid_context,
 	.attr_groups	= amd_uncore_df_attr_groups,
@@ -352,6 +396,7 @@ static struct pmu amd_nb_pmu = {
 static struct pmu amd_llc_pmu = {
 	.task_ctx_nr	= perf_invalid_context,
 	.attr_groups	= amd_uncore_l3_attr_groups,
+	.attr_update	= amd_uncore_l3_attr_update,
 	.name		= "amd_l2",
 	.event_init	= amd_uncore_event_init,
 	.add		= amd_uncore_add,
@@ -632,15 +677,10 @@ static int __init amd_uncore_init(void)
 		if (boot_cpu_data.x86 >= 0x19) {
 			*l3_attr++ = &format_attr_event8.attr;
 			*l3_attr++ = &format_attr_umask.attr;
-			*l3_attr++ = &format_attr_coreid.attr;
-			*l3_attr++ = &format_attr_enallslices.attr;
-			*l3_attr++ = &format_attr_enallcores.attr;
-			*l3_attr++ = &format_attr_sliceid.attr;
 			*l3_attr++ = &format_attr_threadmask2.attr;
 		} else if (boot_cpu_data.x86 >= 0x17) {
 			*l3_attr++ = &format_attr_event8.attr;
 			*l3_attr++ = &format_attr_umask.attr;
-			*l3_attr++ = &format_attr_slicemask.attr;
 			*l3_attr++ = &format_attr_threadmask8.attr;
 		}