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drm/crc: Only report a single overflow when a CRC fd is opened

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This reduces the amount of spam when you debug a CRC reading
program.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
[mlankhorst: Change bool overflow to was_overflow (Ville)]
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180418125121.72081-1-maarten.lankhorst@linux.intel.com
This commit is contained in:
Maarten Lankhorst 2018-04-18 14:51:21 +02:00
parent 8adbbb2e78
commit a012024571
2 changed files with 10 additions and 2 deletions
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7
drivers/gpu/drm/drm_debugfs_crc.c
View File

@ -139,6 +139,7 @@ static int crtc_crc_data_count(struct drm_crtc_crc *crc)
static void crtc_crc_cleanup(struct drm_crtc_crc *crc)
{
kfree(crc->entries);
crc->overflow = false;
crc->entries = NULL;
crc->head = 0;
crc->tail = 0;
@ -391,8 +392,14 @@ int drm_crtc_add_crc_entry(struct drm_crtc *crtc, bool has_frame,
tail = crc->tail;
if (CIRC_SPACE(head, tail, DRM_CRC_ENTRIES_NR) < 1) {
bool was_overflow = crc->overflow;
crc->overflow = true;
spin_unlock(&crc->lock);
if (!was_overflow)
DRM_ERROR("Overflow of CRC buffer, userspace reads too slow.\n");
return -ENOBUFS;
}

3
include/drm/drm_debugfs_crc.h
View File

@ -43,6 +43,7 @@ struct drm_crtc_crc_entry {
* @lock: protects the fields in this struct
* @source: name of the currently configured source of CRCs
* @opened: whether userspace has opened the data file for reading
* @overflow: whether an overflow occured.
* @entries: array of entries, with size of %DRM_CRC_ENTRIES_NR
* @head: head of circular queue
* @tail: tail of circular queue
@ -52,7 +53,7 @@ struct drm_crtc_crc_entry {
struct drm_crtc_crc {
spinlock_t lock;
const char *source;
bool opened;
bool opened, overflow;
struct drm_crtc_crc_entry *entries;
int head, tail;
size_t values_cnt;