[PATCH v1 2/3] drm: Add API for capturing frame CRCs
Tomeu Vizoso
tomeu.vizoso at collabora.com
Tue Jun 21 11:06:41 UTC 2016
Adds a per-device debugfile "drm_crc_control" that allows selecting a
source for frame checksums in each CRTC that supports them.
The checksums for each subsequent frame can be read from the per-CRTC
file "drm_crtc_N_crc".
The code is taken from the i915 driver and other drivers can now provide
frame CRCs by implementing the set_crc_source callback in
drm_crtc_funcs.
Signed-off-by: Tomeu Vizoso <tomeu.vizoso at collabora.com>
---
drivers/gpu/drm/drm_crtc.c | 28 ++-
drivers/gpu/drm/drm_debugfs.c | 506 ++++++++++++++++++++++++++++++++++++++++-
drivers/gpu/drm/drm_internal.h | 10 +
include/drm/drmP.h | 5 +
include/drm/drm_crtc.h | 72 ++++++
5 files changed, 611 insertions(+), 10 deletions(-)
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index e7c862bd2f19..4dae42b122d9 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -657,8 +657,8 @@ int drm_crtc_init_with_planes(struct drm_device *dev, struct drm_crtc *crtc,
drm_num_crtcs(dev));
}
if (!crtc->name) {
- drm_mode_object_unregister(dev, &crtc->base);
- return -ENOMEM;
+ ret = -ENOMEM;
+ goto err_unregister;
}
crtc->base.properties = &crtc->properties;
@@ -673,12 +673,30 @@ int drm_crtc_init_with_planes(struct drm_device *dev, struct drm_crtc *crtc,
if (cursor)
cursor->possible_crtcs = 1 << drm_crtc_index(crtc);
+#ifdef CONFIG_DEBUG_FS
+ spin_lock_init(&crtc->crc.lock);
+ init_waitqueue_head(&crtc->crc.wq);
+ crtc->crc.debugfs_entries = kmalloc_array(DRM_MINOR_CNT,
+ sizeof(*crtc->crc.debugfs_entries),
+ GFP_KERNEL);
+
+ ret = drm_debugfs_crtc_add(crtc);
+ if (ret)
+ goto err_free_name;
+#endif
+
if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
drm_object_attach_property(&crtc->base, config->prop_active, 0);
drm_object_attach_property(&crtc->base, config->prop_mode_id, 0);
}
return 0;
+
+err_free_name:
+ kfree(crtc->name);
+err_unregister:
+ drm_mode_object_unregister(dev, &crtc->base);
+ return ret;
}
EXPORT_SYMBOL(drm_crtc_init_with_planes);
@@ -699,6 +717,12 @@ void drm_crtc_cleanup(struct drm_crtc *crtc)
* the indices on the drm_crtc after us in the crtc_list.
*/
+#ifdef CONFIG_DEBUG_FS
+ drm_debugfs_crtc_remove(crtc);
+ kfree(crtc->crc.debugfs_entries);
+ kfree(crtc->crc.source);
+#endif
+
kfree(crtc->gamma_store);
crtc->gamma_store = NULL;
diff --git a/drivers/gpu/drm/drm_debugfs.c b/drivers/gpu/drm/drm_debugfs.c
index fa10cef2ba37..cdc8836bc22a 100644
--- a/drivers/gpu/drm/drm_debugfs.c
+++ b/drivers/gpu/drm/drm_debugfs.c
@@ -30,6 +30,8 @@
* OTHER DEALINGS IN THE SOFTWARE.
*/
+#include <linux/circ_buf.h>
+#include <linux/ctype.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
@@ -127,6 +129,259 @@ fail:
}
EXPORT_SYMBOL(drm_debugfs_create_files);
+static int
+drm_add_fake_info_node(struct drm_minor *minor,
+ struct dentry *ent,
+ const void *key)
+{
+ struct drm_info_node *node;
+
+ node = kmalloc(sizeof(*node), GFP_KERNEL);
+ if (node == NULL) {
+ debugfs_remove(ent);
+ return -ENOMEM;
+ }
+
+ node->minor = minor;
+ node->dent = ent;
+ node->info_ent = (void *) key;
+
+ mutex_lock(&minor->debugfs_lock);
+ list_add(&node->list, &minor->debugfs_list);
+ mutex_unlock(&minor->debugfs_lock);
+
+ return 0;
+}
+
+static int crc_control_show(struct seq_file *m, void *data)
+{
+ struct drm_device *dev = m->private;
+ struct drm_crtc *crtc;
+
+ drm_for_each_crtc(crtc, dev)
+ seq_printf(m, "crtc %d %s\n", crtc->index,
+ crtc->crc.source ? crtc->crc.source : "none");
+
+ return 0;
+}
+
+static int crc_control_open(struct inode *inode, struct file *file)
+{
+ struct drm_device *dev = inode->i_private;
+
+ return single_open(file, crc_control_show, dev);
+}
+
+static int crc_control_update_crtc(struct drm_crtc *crtc, const char *source)
+{
+ struct drm_crtc_crc *crc = &crtc->crc;
+ struct drm_crtc_crc_entry *entries;
+ int ret;
+
+ if (!strcmp(source, "none"))
+ source = NULL;
+
+ if (!crc->source && !source)
+ return 0;
+
+ if (crc->source && source && !strcmp(crc->source, source))
+ return 0;
+
+ /* Forbid changing the source without going back to "none". */
+ if (crc->source && source)
+ return -EINVAL;
+
+ if (!crtc->funcs->set_crc_source)
+ return -ENOTSUPP;
+
+ if (source) {
+ entries = kcalloc(DRM_CRTC_CRC_ENTRIES_NR,
+ sizeof(crc->entries[0]),
+ GFP_KERNEL);
+ if (!entries)
+ return -ENOMEM;
+
+ spin_lock_irq(&crc->lock);
+ kfree(crc->entries);
+ crc->entries = entries;
+ crc->head = 0;
+ crc->tail = 0;
+ spin_unlock_irq(&crc->lock);
+ }
+
+ ret = crtc->funcs->set_crc_source(crtc, source);
+ if (ret)
+ return ret;
+
+ kfree(crc->source);
+ crc->source = source ? kstrdup(source, GFP_KERNEL) : NULL;
+
+ if (!source) {
+ spin_lock_irq(&crc->lock);
+ entries = crc->entries;
+ crc->entries = NULL;
+ crc->head = 0;
+ crc->tail = 0;
+ spin_unlock_irq(&crc->lock);
+
+ kfree(entries);
+ }
+
+ return 0;
+}
+
+static struct drm_crtc *crtc_from_index(struct drm_device *dev, int index)
+{
+ struct drm_crtc *crtc;
+ int i = 0;
+
+ drm_for_each_crtc(crtc, dev)
+ if (i++ == index)
+ return crtc;
+
+ return NULL;
+}
+
+/*
+ * Parse CRC command strings:
+ * command: wsp* object wsp+ (crtc | pipe) wsp+ source wsp*
+ * object: ('crtc' | 'pipe')
+ * crtc: (0 | 1 | 2 | ...)
+ * pipe: (A | B | C)
+ * source: (none | plane1 | plane2 | ...)
+ * wsp: (#0x20 | #0x9 | #0xA)+
+ *
+ * eg.:
+ * "crtc 0 plane1" -> Start CRC computations on plane1 of first CRTC
+ * "crtc 0 none" -> Stop CRC
+ */
+static int crc_control_tokenize(char *buf, char *words[], int max_words)
+{
+ int n_words = 0;
+
+ while (*buf) {
+ char *end;
+
+ /* skip leading white space */
+ buf = skip_spaces(buf);
+ if (!*buf)
+ break; /* end of buffer */
+
+ /* find end of word */
+ for (end = buf; *end && !isspace(*end); end++)
+ ;
+
+ if (n_words == max_words) {
+ DRM_DEBUG_KMS("too many words, allowed <= %d\n",
+ max_words);
+ return -EINVAL; /* ran out of words[] before bytes */
+ }
+
+ if (*end)
+ *end++ = '\0';
+ words[n_words++] = buf;
+ buf = end;
+ }
+
+ return n_words;
+}
+
+static int crc_control_parse_crtc(const char *buf, unsigned int *crtc_index)
+{
+ const char letter = buf[0];
+
+ if (!kstrtouint(buf, 10, crtc_index))
+ return 0;
+
+ /* Backwards compatibility for Intel-style pipe letters */
+ if (letter < 'A' || letter > 'Z')
+ return -EINVAL;
+
+ *crtc_index = letter - 'A';
+
+ return 0;
+}
+
+static int crc_control_parse(struct drm_device *dev, char *buf, size_t len)
+{
+#define N_WORDS 3
+ int n_words;
+ char *words[N_WORDS];
+ unsigned int crtc_index;
+ struct drm_crtc *crtc;
+
+ n_words = crc_control_tokenize(buf, words, N_WORDS);
+ if (n_words != N_WORDS) {
+ DRM_DEBUG_KMS("tokenize failed, a command is %d words\n",
+ N_WORDS);
+ return -EINVAL;
+ }
+
+ if (strcmp(words[0], "crtc") && strcmp(words[0], "pipe")) {
+ DRM_DEBUG_KMS("Invalid command %s\n", words[0]);
+ return -EINVAL;
+ }
+
+ if (crc_control_parse_crtc(words[1], &crtc_index) < 0) {
+ DRM_DEBUG_KMS("Invalid CRTC index: %s\n", words[1]);
+ return -EINVAL;
+ }
+
+ crtc = crtc_from_index(dev, crtc_index);
+ if (!crtc) {
+ DRM_DEBUG_KMS("Unknown CRTC index: %d\n", crtc_index);
+ return -EINVAL;
+ }
+
+ return crc_control_update_crtc(crtc, words[2]);
+}
+
+static ssize_t crc_control_write(struct file *file, const char __user *ubuf,
+ size_t len, loff_t *offp)
+{
+ struct seq_file *m = file->private_data;
+ struct drm_device *dev = m->private;
+ char *tmpbuf;
+ int ret;
+
+ if (len == 0)
+ return 0;
+
+ if (len > PAGE_SIZE - 1) {
+ DRM_DEBUG_KMS("expected <%lu bytes into crtc crc control\n",
+ PAGE_SIZE);
+ return -E2BIG;
+ }
+
+ tmpbuf = kmalloc(len + 1, GFP_KERNEL);
+ if (!tmpbuf)
+ return -ENOMEM;
+
+ if (copy_from_user(tmpbuf, ubuf, len)) {
+ ret = -EFAULT;
+ goto out;
+ }
+ tmpbuf[len] = '\0';
+
+ ret = crc_control_parse(dev, tmpbuf, len);
+out:
+ kfree(tmpbuf);
+ if (ret < 0)
+ return ret;
+
+ *offp += len;
+ return len;
+}
+
+const struct file_operations drm_crc_control_fops = {
+ .owner = THIS_MODULE,
+ .open = crc_control_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+ .write = crc_control_write
+};
+
/**
* Initialize the DRI debugfs filesystem for a device
*
@@ -142,8 +397,9 @@ int drm_debugfs_init(struct drm_minor *minor, int minor_id,
struct dentry *root)
{
struct drm_device *dev = minor->dev;
+ struct dentry *ent;
char name[64];
- int ret;
+ int ret = 0;
INIT_LIST_HEAD(&minor->debugfs_list);
mutex_init(&minor->debugfs_lock);
@@ -157,10 +413,23 @@ int drm_debugfs_init(struct drm_minor *minor, int minor_id,
ret = drm_debugfs_create_files(drm_debugfs_list, DRM_DEBUGFS_ENTRIES,
minor->debugfs_root, minor);
if (ret) {
- debugfs_remove(minor->debugfs_root);
- minor->debugfs_root = NULL;
DRM_ERROR("Failed to create core drm debugfs files\n");
- return ret;
+ goto error_remove_dir;
+ }
+
+ ent = debugfs_create_file("drm_crc_control", S_IRUGO | S_IWUSR,
+ minor->debugfs_root, dev,
+ &drm_crc_control_fops);
+ if (!ent) {
+ DRM_ERROR("Failed to create CRC control debugfs files\n");
+ ret = -ENOMEM;
+ goto error_remove_files;
+ }
+
+ ret = drm_add_fake_info_node(minor, ent, &drm_crc_control_fops);
+ if (ret) {
+ DRM_ERROR("Failed to create CRC control debugfs files\n");
+ goto error_remove_crc;
}
if (dev->driver->debugfs_init) {
@@ -171,7 +440,18 @@ int drm_debugfs_init(struct drm_minor *minor, int minor_id,
return ret;
}
}
+
return 0;
+
+error_remove_crc:
+ debugfs_remove(ent);
+error_remove_files:
+ drm_debugfs_remove_files(drm_debugfs_list, DRM_DEBUGFS_ENTRIES, minor);
+error_remove_dir:
+ debugfs_remove(minor->debugfs_root);
+ minor->debugfs_root = NULL;
+
+ return ret;
}
@@ -407,13 +687,223 @@ error:
void drm_debugfs_connector_remove(struct drm_connector *connector)
{
- if (!connector->debugfs_entry)
- return;
-
debugfs_remove_recursive(connector->debugfs_entry);
connector->debugfs_entry = NULL;
}
-#endif /* CONFIG_DEBUG_FS */
+static int crtc_crc_open(struct inode *inode, struct file *filep)
+{
+ struct drm_crtc *crtc = inode->i_private;
+ struct drm_crtc_crc *crc = &crtc->crc;
+
+ spin_lock_irq(&crc->lock);
+
+ if (crc->opened) {
+ spin_unlock_irq(&crc->lock);
+ return -EBUSY;
+ }
+
+ crc->opened = true;
+
+ spin_unlock_irq(&crc->lock);
+
+ return 0;
+}
+
+static int crtc_crc_release(struct inode *inode, struct file *filep)
+{
+ struct drm_crtc *crtc = filep->f_inode->i_private;
+ struct drm_crtc_crc *crc = &crtc->crc;
+
+ spin_lock_irq(&crc->lock);
+ crc->opened = false;
+ spin_unlock_irq(&crc->lock);
+
+ return 0;
+}
+
+/* (6 fields, 8 chars each, space separated (5) + '\n') */
+#define CRC_LINE_LEN (6 * 8 + 5 + 1)
+/* account for \'0' */
+#define CRC_BUFFER_LEN (CRC_LINE_LEN + 1)
+
+static int crtc_crc_data_count(struct drm_crtc_crc *crc)
+{
+ assert_spin_locked(&crc->lock);
+ return CIRC_CNT(crc->head, crc->tail,
+ DRM_CRTC_CRC_ENTRIES_NR);
+}
+
+static ssize_t crtc_crc_read(struct file *filep, char __user *user_buf,
+ size_t count, loff_t *pos)
+{
+ struct drm_crtc *crtc = filep->f_inode->i_private;
+ struct drm_crtc_crc *crc = &crtc->crc;
+ char buf[CRC_BUFFER_LEN];
+ int n_entries;
+ ssize_t bytes_read;
+
+ /*
+ * Don't allow user space to provide buffers not big enough to hold
+ * a line of data.
+ */
+ if (count < CRC_LINE_LEN)
+ return -EINVAL;
+
+ if (!crc->source)
+ return 0;
+
+ /* Nothing to read? */
+ spin_lock_irq(&crc->lock);
+ while (crtc_crc_data_count(crc) == 0) {
+ int ret;
+
+ if (filep->f_flags & O_NONBLOCK) {
+ spin_unlock_irq(&crc->lock);
+ return -EAGAIN;
+ }
+
+ ret = wait_event_interruptible_lock_irq(crc->wq,
+ crtc_crc_data_count(crc), crc->lock);
+ if (ret) {
+ spin_unlock_irq(&crc->lock);
+ return ret;
+ }
+ }
+
+ /* We now have one or more entries to read */
+ n_entries = count / CRC_LINE_LEN;
+
+ bytes_read = 0;
+ while (n_entries > 0) {
+ struct drm_crtc_crc_entry *entry =
+ &crc->entries[crc->tail];
+ int ret;
+
+ if (CIRC_CNT(crc->head, crc->tail, DRM_CRTC_CRC_ENTRIES_NR) < 1)
+ break;
+
+ BUILD_BUG_ON_NOT_POWER_OF_2(DRM_CRTC_CRC_ENTRIES_NR);
+ crc->tail = (crc->tail + 1) & (DRM_CRTC_CRC_ENTRIES_NR - 1);
+
+ bytes_read += snprintf(buf, CRC_BUFFER_LEN,
+ "%8u %8x %8x %8x %8x %8x\n",
+ entry->frame, entry->crc[0],
+ entry->crc[1], entry->crc[2],
+ entry->crc[3], entry->crc[4]);
+
+ spin_unlock_irq(&crc->lock);
+
+ ret = copy_to_user(user_buf, buf, CRC_LINE_LEN);
+ if (ret == CRC_LINE_LEN)
+ return -EFAULT;
+ user_buf += CRC_LINE_LEN;
+ n_entries--;
+
+ spin_lock_irq(&crc->lock);
+ }
+
+ spin_unlock_irq(&crc->lock);
+
+ return bytes_read;
+}
+
+const struct file_operations drm_crtc_crc_fops = {
+ .owner = THIS_MODULE,
+ .open = crtc_crc_open,
+ .read = crtc_crc_read,
+ .release = crtc_crc_release,
+};
+
+static int drm_debugfs_crtc_add_for_minor(struct drm_crtc *crtc,
+ struct drm_minor *minor)
+{
+ struct dentry *ent;
+ char *name;
+
+ if (!minor->debugfs_root)
+ return -1;
+
+ name = kasprintf(GFP_KERNEL, "drm_crtc_%d_crc", crtc->index);
+ if (!name)
+ return -ENOMEM;
+
+ ent = debugfs_create_file(name, S_IRUGO, minor->debugfs_root, crtc,
+ &drm_crtc_crc_fops);
+ kfree(name);
+ if (!ent)
+ return PTR_ERR(ent);
+
+ crtc->crc.debugfs_entries[minor->type] = ent;
+
+ return 0;
+}
+
+int drm_debugfs_crtc_add(struct drm_crtc *crtc)
+{
+ int ret;
+
+ ret = drm_debugfs_crtc_add_for_minor(crtc, crtc->dev->control);
+ if (ret)
+ return ret;
+
+ ret = drm_debugfs_crtc_add_for_minor(crtc, crtc->dev->primary);
+ if (ret)
+ return ret;
+
+ ret = drm_debugfs_crtc_add_for_minor(crtc, crtc->dev->render);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+void drm_debugfs_crtc_remove(struct drm_crtc *crtc)
+{
+ int i;
+
+ for (i = 0; i < DRM_MINOR_CNT; i++) {
+ debugfs_remove_recursive(crtc->crc.debugfs_entries[i]);
+ crtc->crc.debugfs_entries[i] = NULL;
+ }
+}
+
+void drm_crtc_add_crc_entry(struct drm_crtc *crtc, uint32_t frame,
+ uint32_t crc0, uint32_t crc1, uint32_t crc2,
+ uint32_t crc3, uint32_t crc4)
+{
+ struct drm_crtc_crc *crc = &crtc->crc;
+ struct drm_crtc_crc_entry *entry;
+ int head, tail;
+
+ spin_lock(&crc->lock);
+
+ head = crc->head;
+ tail = crc->tail;
+
+ if (CIRC_SPACE(head, tail, DRM_CRTC_CRC_ENTRIES_NR) < 1) {
+ spin_unlock(&crc->lock);
+ DRM_ERROR("Overflow of CRC buffer, userspace reads too slow.\n");
+ return;
+ }
+
+ entry = &crc->entries[head];
+
+ entry->frame = frame;
+ entry->crc[0] = crc0;
+ entry->crc[1] = crc1;
+ entry->crc[2] = crc2;
+ entry->crc[3] = crc3;
+ entry->crc[4] = crc4;
+
+ head = (head + 1) & (DRM_CRTC_CRC_ENTRIES_NR - 1);
+ crc->head = head;
+
+ spin_unlock(&crc->lock);
+
+ wake_up_interruptible(&crc->wq);
+}
+
+#endif /* CONFIG_DEBUG_FS */
diff --git a/drivers/gpu/drm/drm_internal.h b/drivers/gpu/drm/drm_internal.h
index 38401d406532..e5b124d937f5 100644
--- a/drivers/gpu/drm/drm_internal.h
+++ b/drivers/gpu/drm/drm_internal.h
@@ -100,6 +100,8 @@ int drm_debugfs_init(struct drm_minor *minor, int minor_id,
int drm_debugfs_cleanup(struct drm_minor *minor);
int drm_debugfs_connector_add(struct drm_connector *connector);
void drm_debugfs_connector_remove(struct drm_connector *connector);
+int drm_debugfs_crtc_add(struct drm_crtc *crtc);
+void drm_debugfs_crtc_remove(struct drm_crtc *crtc);
#else
static inline int drm_debugfs_init(struct drm_minor *minor, int minor_id,
struct dentry *root)
@@ -119,4 +121,12 @@ static inline int drm_debugfs_connector_add(struct drm_connector *connector)
static inline void drm_debugfs_connector_remove(struct drm_connector *connector)
{
}
+
+static inline int drm_debugfs_crtc_add(struct drm_crtc *crtc)
+{
+ return 0;
+}
+static inline void drm_debugfs_crtc_remove(struct drm_crtc *crtc)
+{
+}
#endif
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 084fd141e8bf..ec2f91c8b7cd 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -1142,6 +1142,11 @@ static __inline__ bool drm_can_sleep(void)
return true;
}
+#if defined(CONFIG_DEBUG_FS)
+extern const struct file_operations drm_crc_control_fops;
+extern const struct file_operations drm_crtc_crc_fops;
+#endif
+
/* helper for handling conditionals in various for_each macros */
#define for_each_if(condition) if (!(condition)) {} else
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index c2734979f164..141335a3c647 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -376,6 +376,22 @@ struct drm_crtc_state {
struct drm_atomic_state *state;
};
+struct drm_crtc_crc_entry {
+ uint32_t frame;
+ uint32_t crc[5];
+};
+
+#define DRM_CRTC_CRC_ENTRIES_NR 128
+struct drm_crtc_crc {
+ spinlock_t lock;
+ const char *source;
+ bool opened; /* exclusive access to the result file */
+ struct drm_crtc_crc_entry *entries;
+ int head, tail;
+ wait_queue_head_t wq;
+ struct dentry **debugfs_entries;
+};
+
/**
* struct drm_crtc_funcs - control CRTCs for a given device
*
@@ -704,6 +720,29 @@ struct drm_crtc_funcs {
const struct drm_crtc_state *state,
struct drm_property *property,
uint64_t *val);
+
+ /**
+ * @set_crc_source:
+ *
+ * Changes the source of CRC checksums of frames at the request of
+ * userspace, typically for testing purposes. The sources available are
+ * specific of each driver and a %NULL value indicates that CRC
+ * generation is to be switched off.
+ *
+ * When CRC generation is enabled, the driver should call
+ * drm_crtc_add_crc_entry() at each frame, providing any information
+ * that characterizes the frame contents in the crcN arguments, as
+ * provided from the configured source. Drivers should accept a "auto"
+ * source name that will select a default source for this CRTC.
+ *
+ * This callback is optional if the driver does not support any CRC
+ * generation functionality.
+ *
+ * RETURNS:
+ *
+ * 0 on success or a negative error code on failure.
+ */
+ int (*set_crc_source)(struct drm_crtc *crtc, const char *source);
};
/**
@@ -817,6 +856,15 @@ struct drm_crtc {
* context.
*/
struct drm_modeset_acquire_ctx *acquire_ctx;
+
+#ifdef CONFIG_DEBUG_FS
+ /**
+ * @drm_crtc_crc:
+ *
+ * Configuration settings of CRC capture.
+ */
+ struct drm_crtc_crc crc;
+#endif
};
/**
@@ -2496,6 +2544,30 @@ static inline uint32_t drm_crtc_mask(struct drm_crtc *crtc)
return 1 << drm_crtc_index(crtc);
}
+/**
+ * drm_crtc_add_crc_entry - Add entry with CRC information for a frame
+ * @crtc: CRTC to which the frame belongs
+ * @frame: number of the frame characterized by the CRC data
+ * @crc0: piece of data about frame
+ * @crc1: piece of data about frame
+ * @crc2: piece of data about frame
+ * @crc3: piece of data about frame
+ * @crc4: piece of data about frame
+ *
+ * For each frame, the driver polls the source of CRCs for new data and calls
+ * this function to add them to the buffer from where userspace reads.
+ */
+#if defined(CONFIG_DEBUG_FS)
+void drm_crtc_add_crc_entry(struct drm_crtc *crtc, uint32_t frame,
+ uint32_t crc0, uint32_t crc1, uint32_t crc2,
+ uint32_t crc3, uint32_t crc4);
+#else
+static inline void drm_crtc_add_crc_entry(struct drm_crtc *crtc, uint32_t frame,
+ uint32_t crc0, uint32_t crc1,
+ uint32_t crc2, uint32_t crc3,
+ uint32_t crc4) {}
+#endif
+
extern void drm_connector_ida_init(void);
extern void drm_connector_ida_destroy(void);
extern int drm_connector_init(struct drm_device *dev,
--
2.5.5
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