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[209.132.180.67]) by mx.google.com with ESMTP id z72si5167402pgd.181.2019.06.10.09.36.41; Mon, 10 Jun 2019 09:36:56 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390416AbfFJPj6 (ORCPT + 99 others); Mon, 10 Jun 2019 11:39:58 -0400 Received: from foss.arm.com ([217.140.110.172]:44874 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390073AbfFJPj6 (ORCPT ); Mon, 10 Jun 2019 11:39:58 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id BEE13344; Mon, 10 Jun 2019 08:39:56 -0700 (PDT) Received: from e110455-lin.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 82E593F246; Mon, 10 Jun 2019 08:39:56 -0700 (PDT) Received: by e110455-lin.cambridge.arm.com (Postfix, from userid 1000) id 44A1F682413; Mon, 10 Jun 2019 16:39:55 +0100 (BST) Date: Mon, 10 Jun 2019 16:39:55 +0100 From: Liviu Dudau To: Rodrigo Siqueira Cc: Brian Starkey , Haneen Mohammed , Simon Ser , dri-devel , Linux Kernel Mailing List , Daniel Vetter Subject: Re: [PATCH 2/2] drm/vkms: Add support for writeback Message-ID: <20190610153955.GI4173@e110455-lin.cambridge.arm.com> References: <0acd74232d988970668298be0111c485bc68ec87.1559860606.git.rodrigosiqueiramelo@gmail.com> <20190607074808.GC21222@phenom.ffwll.local> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.11.4 (2019-03-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jun 07, 2019 at 11:58:04AM -0300, Rodrigo Siqueira wrote: > On Fri, Jun 7, 2019 at 4:48 AM Daniel Vetter wrote: > > > > On Thu, Jun 06, 2019 at 07:41:01PM -0300, Rodrigo Siqueira wrote: > > > This patch implements the necessary functions to add writeback support > > > for vkms. This feature is useful for testing compositors if you don’t > > > have hardware with writeback support. > > > > > > Signed-off-by: Rodrigo Siqueira > > > --- > > > drivers/gpu/drm/vkms/Makefile | 9 +- > > > drivers/gpu/drm/vkms/vkms_crtc.c | 5 + > > > drivers/gpu/drm/vkms/vkms_drv.c | 10 ++ > > > drivers/gpu/drm/vkms/vkms_drv.h | 12 ++ > > > drivers/gpu/drm/vkms/vkms_output.c | 6 + > > > drivers/gpu/drm/vkms/vkms_writeback.c | 165 ++++++++++++++++++++++++++ > > > 6 files changed, 206 insertions(+), 1 deletion(-) > > > create mode 100644 drivers/gpu/drm/vkms/vkms_writeback.c > > > > > > diff --git a/drivers/gpu/drm/vkms/Makefile b/drivers/gpu/drm/vkms/Makefile > > > index 89f09bec7b23..90eb7acd618d 100644 > > > --- a/drivers/gpu/drm/vkms/Makefile > > > +++ b/drivers/gpu/drm/vkms/Makefile > > > @@ -1,4 +1,11 @@ > > > # SPDX-License-Identifier: GPL-2.0-only > > > -vkms-y := vkms_drv.o vkms_plane.o vkms_output.o vkms_crtc.o vkms_gem.o vkms_crc.o > > > +vkms-y := \ > > > + vkms_drv.o \ > > > + vkms_plane.o \ > > > + vkms_output.o \ > > > + vkms_crtc.o \ > > > + vkms_gem.o \ > > > + vkms_crc.o \ > > > + vkms_writeback.o > > > > > > obj-$(CONFIG_DRM_VKMS) += vkms.o > > > diff --git a/drivers/gpu/drm/vkms/vkms_crtc.c b/drivers/gpu/drm/vkms/vkms_crtc.c > > > index 1bbe099b7db8..ce797e265b1b 100644 > > > --- a/drivers/gpu/drm/vkms/vkms_crtc.c > > > +++ b/drivers/gpu/drm/vkms/vkms_crtc.c > > > @@ -23,6 +23,11 @@ static enum hrtimer_restart vkms_vblank_simulate(struct hrtimer *timer) > > > if (!ret) > > > DRM_ERROR("vkms failure on handling vblank"); > > > > > > + if (output->writeback_status == WB_START) { > > > + drm_writeback_signal_completion(&output->wb_connector, 0); > > > + output->writeback_status = WB_STOP; > > > + } > > > + > > > if (state && output->crc_enabled) { > > > u64 frame = drm_crtc_accurate_vblank_count(crtc); > > > > > > diff --git a/drivers/gpu/drm/vkms/vkms_drv.c b/drivers/gpu/drm/vkms/vkms_drv.c > > > index 92296bd8f623..d5917d5a45e3 100644 > > > --- a/drivers/gpu/drm/vkms/vkms_drv.c > > > +++ b/drivers/gpu/drm/vkms/vkms_drv.c > > > @@ -29,6 +29,10 @@ bool enable_cursor; > > > module_param_named(enable_cursor, enable_cursor, bool, 0444); > > > MODULE_PARM_DESC(enable_cursor, "Enable/Disable cursor support"); > > > > > > +int enable_writeback; > > > +module_param_named(enable_writeback, enable_writeback, int, 0444); > > > +MODULE_PARM_DESC(enable_writeback, "Enable/Disable writeback connector"); > > > + > > > static const struct file_operations vkms_driver_fops = { > > > .owner = THIS_MODULE, > > > .open = drm_open, > > > @@ -123,6 +127,12 @@ static int __init vkms_init(void) > > > goto out_fini; > > > } > > > > > > + vkms_device->output.writeback_status = WB_DISABLED; > > > + if (enable_writeback) { > > > + vkms_device->output.writeback_status = WB_STOP; > > > + DRM_INFO("Writeback connector enabled"); > > > + } > > > + > > > ret = vkms_modeset_init(vkms_device); > > > if (ret) > > > goto out_fini; > > > diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h > > > index e81073dea154..ca1f9ee63ec8 100644 > > > --- a/drivers/gpu/drm/vkms/vkms_drv.h > > > +++ b/drivers/gpu/drm/vkms/vkms_drv.h > > > @@ -7,6 +7,7 @@ > > > #include > > > #include > > > #include > > > +#include > > > #include > > > > > > #define XRES_MIN 20 > > > @@ -60,14 +61,22 @@ struct vkms_crtc_state { > > > u64 frame_end; > > > }; > > > > > > +enum wb_status { > > > + WB_DISABLED, > > > + WB_START, > > > + WB_STOP, > > > +}; > > > + > > > struct vkms_output { > > > struct drm_crtc crtc; > > > struct drm_encoder encoder; > > > struct drm_connector connector; > > > + struct drm_writeback_connector wb_connector; > > > struct hrtimer vblank_hrtimer; > > > ktime_t period_ns; > > > struct drm_pending_vblank_event *event; > > > bool crc_enabled; > > > + enum wb_status writeback_status; > > > /* ordered wq for crc_work */ > > > struct workqueue_struct *crc_workq; > > > /* protects concurrent access to crc_data */ > > > @@ -141,4 +150,7 @@ int vkms_verify_crc_source(struct drm_crtc *crtc, const char *source_name, > > > size_t *values_cnt); > > > void vkms_crc_work_handle(struct work_struct *work); > > > > > > +/* Writeback */ > > > +int enable_writeback_connector(struct vkms_device *vkmsdev); > > > + > > > #endif /* _VKMS_DRV_H_ */ > > > diff --git a/drivers/gpu/drm/vkms/vkms_output.c b/drivers/gpu/drm/vkms/vkms_output.c > > > index 1442b447c707..1fc1d4e9585c 100644 > > > --- a/drivers/gpu/drm/vkms/vkms_output.c > > > +++ b/drivers/gpu/drm/vkms/vkms_output.c > > > @@ -91,6 +91,12 @@ int vkms_output_init(struct vkms_device *vkmsdev, int index) > > > goto err_attach; > > > } > > > > > > + if (vkmsdev->output.writeback_status != WB_DISABLED) { > > > + ret = enable_writeback_connector(vkmsdev); > > > + if (ret) > > > + DRM_ERROR("Failed to init writeback connector\n"); > > > + } > > > + > > > drm_mode_config_reset(dev); > > > > > > return 0; > > > diff --git a/drivers/gpu/drm/vkms/vkms_writeback.c b/drivers/gpu/drm/vkms/vkms_writeback.c > > > new file mode 100644 > > > index 000000000000..f7b962ae5646 > > > --- /dev/null > > > +++ b/drivers/gpu/drm/vkms/vkms_writeback.c > > > @@ -0,0 +1,165 @@ > > > +// SPDX-License-Identifier: GPL-2.0+ > > > + > > > +#include "vkms_drv.h" > > > +#include > > > +#include > > > +#include > > > +#include > > > + > > > +static const struct drm_connector_funcs vkms_wb_connector_funcs = { > > > + .fill_modes = drm_helper_probe_single_connector_modes, > > > + .destroy = drm_connector_cleanup, > > > + .reset = drm_atomic_helper_connector_reset, > > > + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, > > > + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, > > > +}; > > > + > > > +static int vkms_wb_encoder_atomic_check(struct drm_encoder *encoder, > > > + struct drm_crtc_state *crtc_state, > > > + struct drm_connector_state *conn_state) > > > +{ > > > + struct drm_framebuffer *fb; > > > + const struct drm_display_mode *mode = &crtc_state->mode; > > > + > > > + if (!conn_state->writeback_job || !conn_state->writeback_job->fb) > > > + return 0; > > > + > > > + fb = conn_state->writeback_job->fb; > > > + if (fb->width != mode->hdisplay || fb->height != mode->vdisplay) { > > > + DRM_DEBUG_KMS("Invalid framebuffer size %ux%u\n", > > > + fb->width, fb->height); > > > + return -EINVAL; > > > + } > > > + > > > + if (fb->format->format != DRM_FORMAT_XRGB8888) { > > > + struct drm_format_name_buf format_name; > > > + > > > + DRM_DEBUG_KMS("Invalid pixel format %s\n", > > > + drm_get_format_name(fb->format->format, > > > + &format_name)); > > > + return -EINVAL; > > > + } > > > + > > > + return 0; > > > +} > > > + > > > +static const struct drm_encoder_helper_funcs vkms_wb_encoder_helper_funcs = { > > > + .atomic_check = vkms_wb_encoder_atomic_check, > > > +}; > > > + > > > +static int vkms_wb_connector_get_modes(struct drm_connector *connector) > > > +{ > > > + struct drm_device *dev = connector->dev; > > > + > > > + return drm_add_modes_noedid(connector, dev->mode_config.max_width, > > > + dev->mode_config.max_height); > > > +} > > > + > > > +static int vkms_wb_prepare_job(struct drm_writeback_connector *wb_connector, > > > + struct drm_writeback_job *job) > > > +{ > > > + struct vkms_gem_object *vkms_obj; > > > + struct drm_gem_object *gem_obj; > > > + int ret; > > > + > > > + if (!job->fb) > > > + return 0; > > > + > > > + gem_obj = drm_gem_fb_get_obj(job->fb, 0); > > > + ret = vkms_gem_vmap(gem_obj); > > > + if (ret) { > > > + DRM_ERROR("vmap failed: %d\n", ret); > > > + return ret; > > > + } > > > + > > > + vkms_obj = drm_gem_to_vkms_gem(gem_obj); > > > + job->priv = vkms_obj->vaddr; > > > + > > > + return 0; > > > +} > > > + > > > +static void vkms_wb_cleanup_job(struct drm_writeback_connector *connector, > > > + struct drm_writeback_job *job) > > > +{ > > > + struct drm_gem_object *gem_obj; > > > + > > > + if (!job->fb) > > > + return; > > > + > > > + gem_obj = drm_gem_fb_get_obj(job->fb, 0); > > > + vkms_gem_vunmap(gem_obj); > > > +} > > > + > > > +static void vkms_wb_atomic_commit(struct drm_connector *conn, > > > + struct drm_connector_state *state) > > > +{ > > > + struct vkms_device *vkmsdev = drm_device_to_vkms_device(conn->dev); > > > + struct vkms_output *output = &vkmsdev->output; > > > + struct drm_writeback_connector *wb_conn = &output->wb_connector; > > > + struct drm_connector_state *conn_state = wb_conn->base.state; > > > + void *priv_data = conn_state->writeback_job->priv; > > > + struct vkms_crc_data *primary_data = NULL; > > > + struct drm_framebuffer *fb = NULL; > > > + struct vkms_gem_object *vkms_obj; > > > + struct drm_gem_object *gem_obj; > > > + struct drm_plane *plane; > > > + > > > + if (!conn_state) > > > + return; > > > + > > > + if (!conn_state->writeback_job || !conn_state->writeback_job->fb) { > > > + output->writeback_status = WB_STOP; > > > + DRM_DEBUG_DRIVER("Disable writeback\n"); > > > + return; > > > + } > > > + > > > + drm_for_each_plane(plane, &vkmsdev->drm) { > > > + struct vkms_plane_state *vplane_state; > > > + struct vkms_crc_data *plane_data; > > > + > > > + vplane_state = to_vkms_plane_state(plane->state); > > > + plane_data = vplane_state->crc_data; > > > + > > > + if (drm_framebuffer_read_refcount(&plane_data->fb) == 0) > > > + continue; > > > + > > > + if (plane->type == DRM_PLANE_TYPE_PRIMARY) > > > + primary_data = plane_data; > > > + } > > > + > > > + if (!primary_data) > > > + return; > > > + > > > + fb = &primary_data->fb; > > > + gem_obj = drm_gem_fb_get_obj(fb, 0); > > > + vkms_obj = drm_gem_to_vkms_gem(gem_obj); > > > + > > > + if (!vkms_obj->vaddr || !priv_data) > > > + return; > > > + > > > + memcpy(priv_data, vkms_obj->vaddr, vkms_obj->gem.size); > > > + drm_writeback_queue_job(wb_conn, state); > > > + output->writeback_status = WB_START; > > > > Hm, if this passes the current writeback tests then I guess those tests > > are a bit too simple. Or maybe the test can't use the cursor plane, and > > that's why it doesn't notice that we only write back the primary plane. > > Hi, Hi Rodrigo, > > Sorry, I knew about that, and I should have highlighted this > information in the cover letter. In my original plan, I wanted to land > a basic version of writeback in the vkms to try to upstream the > kms_writeback; then I wish that I could improve vkms and the tests in > parallel. > > In summary, the kms_writeback is not upstream yet, and it needs some > improvements. IHMO, we should try to upstream the current version and > improve it step-by-step by using VKMS. If Brian and Liviu agree, I > would like to try to send a new version of their patchset. What do you > think? I'll be happy to see the changes you've made to kms_writeback tests. I have some stashed changes that were addressing the latest comments I've got, so if we coordinate we should be able to release a new version of the patchset for the tests that hopefully will get merged. Best regards, Liviu > > Daniel, about your patchset (drm/vkms: rework crc worker), just give > me a time to go through your patchset. After that, I'll make the > required changes and update the writeback. > > Thank you all for the feedback. I'll prepare a V2 with all the suggestions. > > > Writeback is supposed to write back the same image you'd see on the > > screen, i.e. with cursor, other planes, any color correction applied and > > anything else really. That means vkms writeback needs to be integrated > > into the crc computation. We need to run that work either when there's a > > writeback job or when we need a crc. Crc would be only computed when > > needed, and for writeback we need to put the entire composited/blended > > buffer into the writeback buffer. > > > > That's why I said yesterday that your work will conflict with my work to > > reorg crc work handling, aside from the final step it needs to do all the > > same things. > > > > I guess would be good to improve igt and add a cursor testcase for write > > (similar to the crc cursor tests we have), or maybe create support in igt > > to use writeback instead of crc, so that we could better check this. > > -Daniel > > > > > +} > > > + > > > +static const struct drm_connector_helper_funcs vkms_wb_conn_helper_funcs = { > > > + .get_modes = vkms_wb_connector_get_modes, > > > + .prepare_writeback_job = vkms_wb_prepare_job, > > > + .cleanup_writeback_job = vkms_wb_cleanup_job, > > > + .atomic_commit = vkms_wb_atomic_commit, > > > +}; > > > + > > > +int enable_writeback_connector(struct vkms_device *vkmsdev) > > > +{ > > > + struct drm_writeback_connector *wb = &vkmsdev->output.wb_connector; > > > + > > > + vkmsdev->output.wb_connector.encoder.possible_crtcs = 1; > > > + drm_connector_helper_add(&wb->base, &vkms_wb_conn_helper_funcs); > > > + > > > + return drm_writeback_connector_init(&vkmsdev->drm, wb, > > > + &vkms_wb_connector_funcs, > > > + &vkms_wb_encoder_helper_funcs, > > > + vkms_formats, > > > + ARRAY_SIZE(vkms_formats)); > > > +} > > > + > > > -- > > > 2.21.0 > > > > > > > > -- > > Daniel Vetter > > Software Engineer, Intel Corporation > > http://blog.ffwll.ch > > > > -- > > Rodrigo Siqueira > https://siqueira.tech -- ==================== | I would like to | | fix the world, | | but they're not | | giving me the | \ source code! / --------------- ¯\_(ツ)_/¯