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ANDROID: KVM: arm64: Add format file for nVHE hyp events

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This format files is a copy paste of the one generated by host events in
order to keep the compatibility for userspace trace tools.

Bug: 229972309
Change-Id: I209e4b2780c104d64af6442bd7968c86b54819ae
Co-authored-By: Nikita Ioffe <ioffe@google.com>
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Signed-off-by: Nikita Ioffe <ioffe@google.com>
This commit is contained in:
Vincent Donnefort 2022-11-28 15:31:00 +00:00
parent 605d8f6940
commit 72aaadc081
1 changed files with 52 additions and 0 deletions
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52
arch/arm64/kvm/hyp_events.c
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@ -54,7 +54,11 @@ struct hyp_event {
#include <asm/kvm_hypevents.h>
#undef HYP_EVENT
#undef HE_PRINTK
#define __entry REC
#define HE_PRINTK(fmt, args...) "\"" fmt "\", " __stringify(args)
#define HYP_EVENT(__name, __proto, __struct, __assign, __printk) \
static char hyp_event_print_fmt_##__name[] = __printk; \
static struct trace_event_functions hyp_event_funcs_##__name = { \
.trace = &hyp_event_trace_##__name, \
}; \
@ -66,6 +70,7 @@ struct hyp_event {
static struct trace_event_call hyp_event_call_##__name = { \
.class = &hyp_event_class_##__name, \
.event.funcs = &hyp_event_funcs_##__name, \
.print_fmt = hyp_event_print_fmt_##__name, \
}; \
static bool hyp_event_enabled_##__name; \
struct hyp_event __section("_hyp_events") hyp_event_##__name = { \
@ -191,6 +196,46 @@ static const struct file_operations hyp_event_id_fops = {
.release = single_release,
};
static int hyp_event_format_show(struct seq_file *m, void *v)
{
struct hyp_event *evt = (struct hyp_event *)m->private;
struct trace_event_fields *field;
unsigned int offset = sizeof(struct hyp_entry_hdr);
seq_printf(m, "name: %s\n", evt->name);
seq_printf(m, "ID: %d\n", evt->call->event.type);
seq_puts(m, "format:\n\tfield:unsigned short common_type;\toffset:0;\tsize:2;\tsigned:0;\n");
seq_puts(m, "\n");
field = &evt->call->class->fields_array[0];
while (field->name) {
seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n",
field->type, field->name, offset, field->size,
!!field->is_signed);
offset += field->size;
field++;
}
if (field != &evt->call->class->fields_array[0])
seq_puts(m, "\n");
seq_printf(m, "print fmt: %s\n", evt->call->print_fmt);
return 0;
}
static int hyp_event_format_open(struct inode *inode, struct file *file)
{
return single_open(file, hyp_event_format_show, inode->i_private);
}
static const struct file_operations hyp_event_format_fops = {
.open = hyp_event_format_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static char early_events[COMMAND_LINE_SIZE];
static __init int setup_hyp_event_early(char *str)
@ -262,6 +307,13 @@ void kvm_hyp_init_events_tracefs(struct dentry *parent)
&hyp_event_id_fops);
if (!d)
pr_err("Failed to create events/hyp/%s/id\n", event->name);
d = tracefs_create_file("format", 0400, event_dir, (void *)event,
&hyp_event_format_fops);
if (!d)
pr_err("Failed to create events/hyp/%s/format\n",
event->name);
}
}