From 9edbf1fa600a2ef17c7553c2103d0055d0320d15 Mon Sep 17 00:00:00 2001 From: Tomeu Vizoso Date: Thu, 6 Oct 2016 17:21:06 +0200 Subject: drm: Add API for capturing frame CRCs Adds files and directories to debugfs for controlling and reading frame CRCs, per CRTC: dri/0/crtc-0/crc dri/0/crtc-0/crc/control dri/0/crtc-0/crc/data Drivers can implement the set_crc_source callback() in drm_crtc_funcs to start and stop generating frame CRCs and can add entries to the output by calling drm_crtc_add_crc_entry. v2: - Lots of good fixes suggested by Thierry. - Added documentation. - Changed the debugfs layout. - Moved to allocate the entries circular queue once when frame generation gets enabled for the first time. v3: - Use the control file just to select the source, and start and stop capture when the data file is opened and closed, respectively. - Make variable the number of CRC values per entry, per source. - Allocate entries queue each time we start capturing as now there isn't a fixed number of CRC values per entry. - Store the frame counter in the data file as a 8-digit hex number. - For sources that cannot provide useful frame numbers, place XXXXXXXX in the frame field. v4: - Build only if CONFIG_DEBUG_FS is enabled. - Use memdup_user_nul. - Consolidate calculation of the size of an entry in a helper. - Add 0x prefix to hex numbers in the data file. - Remove unnecessary snprintf and strlen usage in read callback. v5: - Made the crcs array in drm_crtc_crc_entry fixed-size - Lots of other smaller improvements suggested by Emil Velikov v7: - Move definition of drm_debugfs_crtc_crc_add to drm_internal.h v8: - Call debugfs_remove_recursive when we fail to create the minor device v9: - Register the debugfs directory for a crtc from drm_crtc_register_all() v10: - Don't let debugfs failures interrupt CRTC registration (Emil Velikov) v11: - Remove extra brace that broke compilation. Sorry! Signed-off-by: Tomeu Vizoso Reviewed-by: Emil Velikov Acked-by: Benjamin Gaignard Signed-off-by: Daniel Vetter Link: http://patchwork.freedesktop.org/patch/msgid/1475767268-14379-3-git-send-email-tomeu.vizoso@collabora.com --- drivers/gpu/drm/drm_crtc.c | 34 +++++++++++++++++++++++++++++++++- 1 file changed, 33 insertions(+), 1 deletion(-) (limited to 'drivers/gpu/drm/drm_crtc.c') diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c index 2d7bedf28647..60403bf7a4ff 100644 --- a/drivers/gpu/drm/drm_crtc.c +++ b/drivers/gpu/drm/drm_crtc.c @@ -40,7 +40,7 @@ #include #include #include -#include +#include #include "drm_crtc_internal.h" #include "drm_internal.h" @@ -122,6 +122,10 @@ static int drm_crtc_register_all(struct drm_device *dev) int ret = 0; drm_for_each_crtc(crtc, dev) { + if (drm_debugfs_crtc_add(crtc)) + DRM_ERROR("Failed to initialize debugfs entry for CRTC '%s'.\n", + crtc->name); + if (crtc->funcs->late_register) ret = crtc->funcs->late_register(crtc); if (ret) @@ -138,9 +142,29 @@ static void drm_crtc_unregister_all(struct drm_device *dev) drm_for_each_crtc(crtc, dev) { if (crtc->funcs->early_unregister) crtc->funcs->early_unregister(crtc); + drm_debugfs_crtc_remove(crtc); } } +static int drm_crtc_crc_init(struct drm_crtc *crtc) +{ +#ifdef CONFIG_DEBUG_FS + spin_lock_init(&crtc->crc.lock); + init_waitqueue_head(&crtc->crc.wq); + crtc->crc.source = kstrdup("auto", GFP_KERNEL); + if (!crtc->crc.source) + return -ENOMEM; +#endif + return 0; +} + +static void drm_crtc_crc_fini(struct drm_crtc *crtc) +{ +#ifdef CONFIG_DEBUG_FS + kfree(crtc->crc.source); +#endif +} + /** * drm_crtc_init_with_planes - Initialise a new CRTC object with * specified primary and cursor planes. @@ -210,6 +234,12 @@ int drm_crtc_init_with_planes(struct drm_device *dev, struct drm_crtc *crtc, if (cursor) cursor->possible_crtcs = 1 << drm_crtc_index(crtc); + ret = drm_crtc_crc_init(crtc); + if (ret) { + drm_mode_object_unregister(dev, &crtc->base); + return ret; + } + 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); @@ -236,6 +266,8 @@ void drm_crtc_cleanup(struct drm_crtc *crtc) * the indices on the drm_crtc after us in the crtc_list. */ + drm_crtc_crc_fini(crtc); + kfree(crtc->gamma_store); crtc->gamma_store = NULL; -- cgit v1.2.3