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powerpc/perf/hv-24x7: Fail 24x7 initcall if create_events_from_catalog() fails

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As Michael pointed out, create_events_from_catalog() fails when we
either have:
 - a kernel bug
 - some sort of hypervisor misconfiguration
 - ENOMEM

In all the above cases, we can also fail 24x7 initcall.

For hypervisor errors, EIO is used so there is something reported
in dmesg.

Signed-off-by: Li Zhong <zhong@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Li Zhong 2015-04-13 15:48:37 +08:00 committed by Michael Ellerman
parent ad30cb9946
commit 7debc970ae
1 changed files with 29 additions and 8 deletions
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37
arch/powerpc/perf/hv-24x7.c
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@ -647,7 +647,7 @@ static ssize_t catalog_event_len_validate(struct hv_24x7_event_data *event,
#define MAX_4K (SIZE_MAX / 4096)
static void create_events_from_catalog(struct attribute ***events_,
static int create_events_from_catalog(struct attribute ***events_,
struct attribute ***event_descs_,
struct attribute ***event_long_descs_)
{
@ -665,19 +665,25 @@ static void create_events_from_catalog(struct attribute ***events_,
void *event_data, *end;
struct hv_24x7_event_data *event;
struct rb_root ev_uniq = RB_ROOT;
int ret = 0;
if (!page)
if (!page) {
ret = -ENOMEM;
goto e_out;
}
hret = h_get_24x7_catalog_page(page, 0, 0);
if (hret)
if (hret) {
ret = -EIO;
goto e_free;
}
catalog_version_num = be64_to_cpu(page_0->version);
catalog_page_len = be32_to_cpu(page_0->length);
if (MAX_4K < catalog_page_len) {
pr_err("invalid page count: %zu\n", catalog_page_len);
ret = -EIO;
goto e_free;
}
@ -696,6 +702,7 @@ static void create_events_from_catalog(struct attribute ***events_,
|| (MAX_4K - event_data_offs < event_data_len)) {
pr_err("invalid event data offs %zu and/or len %zu\n",
event_data_offs, event_data_len);
ret = -EIO;
goto e_free;
}
@ -704,12 +711,14 @@ static void create_events_from_catalog(struct attribute ***events_,
event_data_offs,
event_data_offs + event_data_len,
catalog_page_len);
ret = -EIO;
goto e_free;
}
if (SIZE_MAX / MAX_EVENTS_PER_EVENT_DATA - 1 < event_entry_count) {
pr_err("event_entry_count %zu is invalid\n",
event_entry_count);
ret = -EIO;
goto e_free;
}
@ -722,6 +731,7 @@ static void create_events_from_catalog(struct attribute ***events_,
event_data = vmalloc(event_data_bytes);
if (!event_data) {
pr_err("could not allocate event data\n");
ret = -ENOMEM;
goto e_free;
}
@ -741,6 +751,7 @@ static void create_events_from_catalog(struct attribute ***events_,
if (hret) {
pr_err("failed to get event data in page %zu\n",
i + event_data_offs);
ret = -EIO;
goto e_event_data;
}
}
@ -788,18 +799,24 @@ static void create_events_from_catalog(struct attribute ***events_,
event_idx_last, event_entry_count, junk_events);
events = kmalloc_array(attr_max + 1, sizeof(*events), GFP_KERNEL);
if (!events)
if (!events) {
ret = -ENOMEM;
goto e_event_data;
}
event_descs = kmalloc_array(event_idx + 1, sizeof(*event_descs),
GFP_KERNEL);
if (!event_descs)
if (!event_descs) {
ret = -ENOMEM;
goto e_event_attrs;
}
event_long_descs = kmalloc_array(event_idx + 1,
sizeof(*event_long_descs), GFP_KERNEL);
if (!event_long_descs)
if (!event_long_descs) {
ret = -ENOMEM;
goto e_event_descs;
}
/* Iterate over the catalog filling in the attribute vector */
for (junk_events = 0, event_attr_ct = 0, desc_ct = 0, long_desc_ct = 0,
@ -853,7 +870,7 @@ static void create_events_from_catalog(struct attribute ***events_,
*events_ = events;
*event_descs_ = event_descs;
*event_long_descs_ = event_long_descs;
return;
return 0;
e_event_descs:
kfree(event_descs);
@ -867,6 +884,7 @@ e_out:
*events_ = NULL;
*event_descs_ = NULL;
*event_long_descs_ = NULL;
return ret;
}
static ssize_t catalog_read(struct file *filp, struct kobject *kobj,
@ -1275,10 +1293,13 @@ static int hv_24x7_init(void)
/* sampling not supported */
h_24x7_pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT;
create_events_from_catalog(&event_group.attrs,
r = create_events_from_catalog(&event_group.attrs,
&event_desc_group.attrs,
&event_long_desc_group.attrs);
if (r)
return r;
r = perf_pmu_register(&h_24x7_pmu, h_24x7_pmu.name, -1);
if (r)
return r;