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@@ -0,0 +1,351 @@
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+/*
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+ * Copyright © 2008 Intel Corporation
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+ * Copyright © 2016 Collabora Ltd
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+ *
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+ * Permission is hereby granted, free of charge, to any person obtaining a
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+ * copy of this software and associated documentation files (the "Software"),
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+ * to deal in the Software without restriction, including without limitation
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+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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+ * and/or sell copies of the Software, and to permit persons to whom the
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+ * Software is furnished to do so, subject to the following conditions:
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+ *
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+ * The above copyright notice and this permission notice (including the next
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+ * paragraph) shall be included in all copies or substantial portions of the
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+ * Software.
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+ *
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+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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+ * IN THE SOFTWARE.
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+ *
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+ * Based on code from the i915 driver.
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+ * Original author: Damien Lespiau <damien.lespiau@intel.com>
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+ *
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+ */
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+
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+#include <linux/circ_buf.h>
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+#include <linux/ctype.h>
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+#include <linux/debugfs.h>
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+#include <drm/drmP.h>
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+
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+/**
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+ * DOC: CRC ABI
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+ *
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+ * DRM device drivers can provide to userspace CRC information of each frame as
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+ * it reached a given hardware component (a "source").
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+ *
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+ * Userspace can control generation of CRCs in a given CRTC by writing to the
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+ * file dri/0/crtc-N/crc/control in debugfs, with N being the index of the CRTC.
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+ * Accepted values are source names (which are driver-specific) and the "auto"
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+ * keyword, which will let the driver select a default source of frame CRCs
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+ * for this CRTC.
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+ *
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+ * Once frame CRC generation is enabled, userspace can capture them by reading
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+ * the dri/0/crtc-N/crc/data file. Each line in that file contains the frame
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+ * number in the first field and then a number of unsigned integer fields
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+ * containing the CRC data. Fields are separated by a single space and the number
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+ * of CRC fields is source-specific.
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+ *
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+ * Note that though in some cases the CRC is computed in a specified way and on
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+ * the frame contents as supplied by userspace (eDP 1.3), in general the CRC
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+ * computation is performed in an unspecified way and on frame contents that have
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+ * been already processed in also an unspecified way and thus userspace cannot
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+ * rely on being able to generate matching CRC values for the frame contents that
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+ * it submits. In this general case, the maximum userspace can do is to compare
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+ * the reported CRCs of frames that should have the same contents.
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+ */
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+
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+static int crc_control_show(struct seq_file *m, void *data)
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+{
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+ struct drm_crtc *crtc = m->private;
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+
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+ seq_printf(m, "%s\n", crtc->crc.source);
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+
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+ return 0;
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+}
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+
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+static int crc_control_open(struct inode *inode, struct file *file)
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+{
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+ struct drm_crtc *crtc = inode->i_private;
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+
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+ return single_open(file, crc_control_show, crtc);
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+}
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+
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+static ssize_t crc_control_write(struct file *file, const char __user *ubuf,
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+ size_t len, loff_t *offp)
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+{
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+ struct seq_file *m = file->private_data;
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+ struct drm_crtc *crtc = m->private;
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+ struct drm_crtc_crc *crc = &crtc->crc;
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+ char *source;
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+
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+ if (len == 0)
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+ return 0;
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+
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+ if (len > PAGE_SIZE - 1) {
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+ DRM_DEBUG_KMS("Expected < %lu bytes into crtc crc control\n",
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+ PAGE_SIZE);
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+ return -E2BIG;
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+ }
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+
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+ source = memdup_user_nul(ubuf, len);
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+ if (IS_ERR(source))
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+ return PTR_ERR(source);
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+
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+ if (source[len] == '\n')
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+ source[len] = '\0';
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+
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+ spin_lock_irq(&crc->lock);
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+
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+ if (crc->opened) {
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+ spin_unlock_irq(&crc->lock);
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+ kfree(source);
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+ return -EBUSY;
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+ }
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+
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+ kfree(crc->source);
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+ crc->source = source;
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+
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+ spin_unlock_irq(&crc->lock);
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+
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+ *offp += len;
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+ return len;
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+}
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+
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+const struct file_operations drm_crtc_crc_control_fops = {
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+ .owner = THIS_MODULE,
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+ .open = crc_control_open,
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+ .read = seq_read,
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+ .llseek = seq_lseek,
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+ .release = single_release,
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+ .write = crc_control_write
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+};
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+
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+static int crtc_crc_open(struct inode *inode, struct file *filep)
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+{
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+ struct drm_crtc *crtc = inode->i_private;
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+ struct drm_crtc_crc *crc = &crtc->crc;
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+ struct drm_crtc_crc_entry *entries = NULL;
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+ size_t values_cnt;
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+ int ret;
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+
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+ if (crc->opened)
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+ return -EBUSY;
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+
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+ ret = crtc->funcs->set_crc_source(crtc, crc->source, &values_cnt);
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+ if (ret)
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+ return ret;
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+
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+ if (WARN_ON(values_cnt > DRM_MAX_CRC_NR)) {
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+ ret = -EINVAL;
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+ goto err_disable;
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+ }
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+
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+ if (WARN_ON(values_cnt == 0)) {
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+ ret = -EINVAL;
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+ goto err_disable;
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+ }
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+
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+ entries = kcalloc(DRM_CRC_ENTRIES_NR, sizeof(*entries), GFP_KERNEL);
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+ if (!entries) {
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+ ret = -ENOMEM;
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+ goto err_disable;
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+ }
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+
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+ spin_lock_irq(&crc->lock);
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+ crc->entries = entries;
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+ crc->values_cnt = values_cnt;
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+ crc->opened = true;
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+ spin_unlock_irq(&crc->lock);
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+
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+ return 0;
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+
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+err_disable:
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+ crtc->funcs->set_crc_source(crtc, NULL, &values_cnt);
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+ return ret;
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+}
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+
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+static int crtc_crc_release(struct inode *inode, struct file *filep)
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+{
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+ struct drm_crtc *crtc = filep->f_inode->i_private;
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+ struct drm_crtc_crc *crc = &crtc->crc;
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+ size_t values_cnt;
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+
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+ spin_lock_irq(&crc->lock);
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+ kfree(crc->entries);
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+ crc->entries = NULL;
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+ crc->head = 0;
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+ crc->tail = 0;
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+ crc->values_cnt = 0;
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+ crc->opened = false;
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+ spin_unlock_irq(&crc->lock);
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+
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+ crtc->funcs->set_crc_source(crtc, NULL, &values_cnt);
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+
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+ return 0;
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+}
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+
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+static int crtc_crc_data_count(struct drm_crtc_crc *crc)
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+{
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+ assert_spin_locked(&crc->lock);
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+ return CIRC_CNT(crc->head, crc->tail, DRM_CRC_ENTRIES_NR);
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+}
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+
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+/*
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+ * 1 frame field of 10 chars plus a number of CRC fields of 10 chars each, space
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+ * separated, with a newline at the end and null-terminated.
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+ */
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+#define LINE_LEN(values_cnt) (10 + 11 * values_cnt + 1 + 1)
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+#define MAX_LINE_LEN (LINE_LEN(DRM_MAX_CRC_NR))
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+
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+static ssize_t crtc_crc_read(struct file *filep, char __user *user_buf,
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+ size_t count, loff_t *pos)
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+{
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+ struct drm_crtc *crtc = filep->f_inode->i_private;
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+ struct drm_crtc_crc *crc = &crtc->crc;
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+ struct drm_crtc_crc_entry *entry;
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+ char buf[MAX_LINE_LEN];
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+ int ret, i;
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+
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+ spin_lock_irq(&crc->lock);
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+
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+ if (!crc->source) {
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+ spin_unlock_irq(&crc->lock);
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+ return 0;
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+ }
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+
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+ /* Nothing to read? */
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+ while (crtc_crc_data_count(crc) == 0) {
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+ if (filep->f_flags & O_NONBLOCK) {
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+ spin_unlock_irq(&crc->lock);
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+ return -EAGAIN;
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+ }
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+
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+ ret = wait_event_interruptible_lock_irq(crc->wq,
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+ crtc_crc_data_count(crc),
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+ crc->lock);
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+ if (ret) {
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+ spin_unlock_irq(&crc->lock);
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+ return ret;
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+ }
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+ }
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+
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+ /* We know we have an entry to be read */
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+ entry = &crc->entries[crc->tail];
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+
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+ if (count < LINE_LEN(crc->values_cnt)) {
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+ spin_unlock_irq(&crc->lock);
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+ return -EINVAL;
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+ }
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+
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+ BUILD_BUG_ON_NOT_POWER_OF_2(DRM_CRC_ENTRIES_NR);
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+ crc->tail = (crc->tail + 1) & (DRM_CRC_ENTRIES_NR - 1);
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+
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+ spin_unlock_irq(&crc->lock);
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+
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+ if (entry->has_frame_counter)
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+ sprintf(buf, "0x%08x", entry->frame);
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+ else
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+ sprintf(buf, "XXXXXXXXXX");
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+
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+ for (i = 0; i < crc->values_cnt; i++)
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+ sprintf(buf + 10 + i * 11, " 0x%08x", entry->crcs[i]);
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+ sprintf(buf + 10 + crc->values_cnt * 11, "\n");
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+
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+ if (copy_to_user(user_buf, buf, LINE_LEN(crc->values_cnt)))
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+ return -EFAULT;
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+
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+ return LINE_LEN(crc->values_cnt);
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+}
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+
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+const struct file_operations drm_crtc_crc_data_fops = {
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+ .owner = THIS_MODULE,
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+ .open = crtc_crc_open,
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+ .read = crtc_crc_read,
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+ .release = crtc_crc_release,
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+};
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+
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+/**
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+ * drm_debugfs_crtc_crc_add - Add files to debugfs for capture of frame CRCs
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+ * @crtc: CRTC to whom the frames will belong
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+ *
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+ * Adds files to debugfs directory that allows userspace to control the
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+ * generation of frame CRCs and to read them.
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+ *
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+ * Returns:
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+ * Zero on success, error code on failure.
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+ */
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+int drm_debugfs_crtc_crc_add(struct drm_crtc *crtc)
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+{
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+ struct dentry *crc_ent, *ent;
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+
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+ if (!crtc->funcs->set_crc_source)
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+ return 0;
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+
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+ crc_ent = debugfs_create_dir("crc", crtc->debugfs_entry);
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+ if (!crc_ent)
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+ return -ENOMEM;
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+
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+ ent = debugfs_create_file("control", S_IRUGO, crc_ent, crtc,
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+ &drm_crtc_crc_control_fops);
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+ if (!ent)
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+ goto error;
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+
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+ ent = debugfs_create_file("data", S_IRUGO, crc_ent, crtc,
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+ &drm_crtc_crc_data_fops);
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+ if (!ent)
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+ goto error;
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+
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+ return 0;
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+
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+error:
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+ debugfs_remove_recursive(crc_ent);
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+
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+ return -ENOMEM;
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+}
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+
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+/**
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+ * drm_crtc_add_crc_entry - Add entry with CRC information for a frame
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+ * @crtc: CRTC to which the frame belongs
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+ * @has_frame: whether this entry has a frame number to go with
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+ * @frame: number of the frame these CRCs are about
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+ * @crcs: array of CRC values, with length matching #drm_crtc_crc.values_cnt
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+ *
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+ * For each frame, the driver polls the source of CRCs for new data and calls
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+ * this function to add them to the buffer from where userspace reads.
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+ */
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+int drm_crtc_add_crc_entry(struct drm_crtc *crtc, bool has_frame,
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+ uint32_t frame, uint32_t *crcs)
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+{
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+ struct drm_crtc_crc *crc = &crtc->crc;
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+ struct drm_crtc_crc_entry *entry;
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+ int head, tail;
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+
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+ assert_spin_locked(&crc->lock);
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+
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+ /* Caller may not have noticed yet that userspace has stopped reading */
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+ if (!crc->opened)
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+ return -EINVAL;
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+
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+ head = crc->head;
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+ tail = crc->tail;
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+
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+ if (CIRC_SPACE(head, tail, DRM_CRC_ENTRIES_NR) < 1) {
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+ DRM_ERROR("Overflow of CRC buffer, userspace reads too slow.\n");
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+ return -ENOBUFS;
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+ }
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+
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+ entry = &crc->entries[head];
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+ entry->frame = frame;
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+ entry->has_frame_counter = has_frame;
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+ memcpy(&entry->crcs, crcs, sizeof(*crcs) * crc->values_cnt);
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+
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+ head = (head + 1) & (DRM_CRC_ENTRIES_NR - 1);
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+ crc->head = head;
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+
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+ return 0;
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+}
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+EXPORT_SYMBOL_GPL(drm_crtc_add_crc_entry);
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Tomeu Vizoso