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author | Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com> | 2018-07-11 23:02:26 -0300 |
---|---|---|
committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2018-07-12 08:48:48 +0200 |
commit | 3a0709928b172a4123a76078f70e0a706265690c (patch) | |
tree | 25c6b56f32fd82d15a27fe06a7691e450e60a454 /drivers/gpu/drm/vkms | |
parent | d16489307a52f028dcb072addf681f9280f585c6 (diff) | |
download | linux-3a0709928b172a4123a76078f70e0a706265690c.tar.bz2 |
drm/vkms: Add vblank events simulated by hrtimers
This commit adds regular vblank events simulated through hrtimers, which
is a feature required by VKMS to mimic real hardware. Additionally, all
the vblank event send after pageflip is kept in the atomic_flush
function.
Changes since V1:
- Compute the vblank timer interval per interruption
Ville Syrjälä and Daniel Vetter:
- Removes hardcoded vblank interval to get it from user space
Changes since V2:
Chris Wilson
- Removes unnecessary algorithm to compute the next period
Daniel Vetter:
- Uses drm_calc_timestamping_constants to get the vblank interval
instead of calculating it manually
- Adds disable_vblank helper that turns of crtc
- Simplifies implementation by using drm_crtc_arm_vblank_event
- Replaces the code in atomic_begin to atomic_flush
- Removes unnecessary field in vkms_output
Changes since V3:
Daniel Vetter:
- Squash "drm/vkms: Add atomic helpers functions" into the commit that
handling vblank events simulated by hrtimers
Signed-off-by: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/7709bba40782ec06332d57fff337797b272581fc.1531359228.git.rodrigosiqueiramelo@gmail.com
Diffstat (limited to 'drivers/gpu/drm/vkms')
-rw-r--r-- | drivers/gpu/drm/vkms/vkms_crtc.c | 95 | ||||
-rw-r--r-- | drivers/gpu/drm/vkms/vkms_drv.c | 9 | ||||
-rw-r--r-- | drivers/gpu/drm/vkms/vkms_drv.h | 15 |
3 files changed, 119 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vkms/vkms_crtc.c b/drivers/gpu/drm/vkms/vkms_crtc.c index bf76cd39ece7..875fca662ac0 100644 --- a/drivers/gpu/drm/vkms/vkms_crtc.c +++ b/drivers/gpu/drm/vkms/vkms_crtc.c @@ -10,6 +10,60 @@ #include <drm/drm_atomic_helper.h> #include <drm/drm_crtc_helper.h> +static enum hrtimer_restart vkms_vblank_simulate(struct hrtimer *timer) +{ + struct vkms_output *output = container_of(timer, struct vkms_output, + vblank_hrtimer); + struct drm_crtc *crtc = &output->crtc; + int ret_overrun; + bool ret; + + ret = drm_crtc_handle_vblank(crtc); + if (!ret) + DRM_ERROR("vkms failure on handling vblank"); + + ret_overrun = hrtimer_forward_now(&output->vblank_hrtimer, + output->period_ns); + + return HRTIMER_RESTART; +} + +static int vkms_enable_vblank(struct drm_crtc *crtc) +{ + struct drm_device *dev = crtc->dev; + unsigned int pipe = drm_crtc_index(crtc); + struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; + struct vkms_output *out = drm_crtc_to_vkms_output(crtc); + + drm_calc_timestamping_constants(crtc, &crtc->mode); + + hrtimer_init(&out->vblank_hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + out->vblank_hrtimer.function = &vkms_vblank_simulate; + out->period_ns = ktime_set(0, vblank->framedur_ns); + hrtimer_start(&out->vblank_hrtimer, out->period_ns, HRTIMER_MODE_REL); + + return 0; +} + +static void vkms_disable_vblank(struct drm_crtc *crtc) +{ + struct vkms_output *out = drm_crtc_to_vkms_output(crtc); + + hrtimer_cancel(&out->vblank_hrtimer); +} + +bool vkms_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe, + int *max_error, ktime_t *vblank_time, + bool in_vblank_irq) +{ + struct vkms_device *vkmsdev = drm_device_to_vkms_device(dev); + struct vkms_output *output = &vkmsdev->output; + + *vblank_time = output->vblank_hrtimer.node.expires; + + return true; +} + static const struct drm_crtc_funcs vkms_crtc_funcs = { .set_config = drm_atomic_helper_set_config, .destroy = drm_crtc_cleanup, @@ -17,6 +71,45 @@ static const struct drm_crtc_funcs vkms_crtc_funcs = { .reset = drm_atomic_helper_crtc_reset, .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state, .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state, + .enable_vblank = vkms_enable_vblank, + .disable_vblank = vkms_disable_vblank, +}; + +static void vkms_crtc_atomic_enable(struct drm_crtc *crtc, + struct drm_crtc_state *old_state) +{ + drm_crtc_vblank_on(crtc); +} + +static void vkms_crtc_atomic_disable(struct drm_crtc *crtc, + struct drm_crtc_state *old_state) +{ + drm_crtc_vblank_off(crtc); +} + +static void vkms_crtc_atomic_flush(struct drm_crtc *crtc, + struct drm_crtc_state *old_crtc_state) +{ + unsigned long flags; + + if (crtc->state->event) { + spin_lock_irqsave(&crtc->dev->event_lock, flags); + + if (drm_crtc_vblank_get(crtc) != 0) + drm_crtc_send_vblank_event(crtc, crtc->state->event); + else + drm_crtc_arm_vblank_event(crtc, crtc->state->event); + + spin_unlock_irqrestore(&crtc->dev->event_lock, flags); + + crtc->state->event = NULL; + } +} + +static const struct drm_crtc_helper_funcs vkms_crtc_helper_funcs = { + .atomic_flush = vkms_crtc_atomic_flush, + .atomic_enable = vkms_crtc_atomic_enable, + .atomic_disable = vkms_crtc_atomic_disable, }; int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc, @@ -31,5 +124,7 @@ int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc, return ret; } + drm_crtc_helper_add(crtc, &vkms_crtc_helper_funcs); + return ret; } diff --git a/drivers/gpu/drm/vkms/vkms_drv.c b/drivers/gpu/drm/vkms/vkms_drv.c index 823693235545..a1448fb56893 100644 --- a/drivers/gpu/drm/vkms/vkms_drv.c +++ b/drivers/gpu/drm/vkms/vkms_drv.c @@ -54,6 +54,7 @@ static struct drm_driver vkms_driver = { .dumb_map_offset = vkms_dumb_map, .gem_vm_ops = &vkms_gem_vm_ops, .gem_free_object_unlocked = vkms_gem_free_object, + .get_vblank_timestamp = vkms_get_vblank_timestamp, .name = DRIVER_NAME, .desc = DRIVER_DESC, @@ -100,6 +101,14 @@ static int __init vkms_init(void) goto out_fini; } + vkms_device->drm.irq_enabled = true; + + ret = drm_vblank_init(&vkms_device->drm, 1); + if (ret) { + DRM_ERROR("Failed to vblank\n"); + goto out_fini; + } + ret = vkms_modeset_init(vkms_device); if (ret) goto out_unregister; diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h index 57d7367fd814..07be29f2dc44 100644 --- a/drivers/gpu/drm/vkms/vkms_drv.h +++ b/drivers/gpu/drm/vkms/vkms_drv.h @@ -5,6 +5,7 @@ #include <drm/drm.h> #include <drm/drm_gem.h> #include <drm/drm_encoder.h> +#include <linux/hrtimer.h> #define XRES_MIN 32 #define YRES_MIN 32 @@ -23,6 +24,9 @@ struct vkms_output { struct drm_crtc crtc; struct drm_encoder encoder; struct drm_connector connector; + struct hrtimer vblank_hrtimer; + ktime_t period_ns; + struct drm_pending_vblank_event *event; }; struct vkms_device { @@ -37,9 +41,20 @@ struct vkms_gem_object { struct page **pages; }; +#define drm_crtc_to_vkms_output(target) \ + container_of(target, struct vkms_output, crtc) + +#define drm_device_to_vkms_device(target) \ + container_of(target, struct vkms_device, drm) + +/* CRTC */ int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc, struct drm_plane *primary, struct drm_plane *cursor); +bool vkms_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe, + int *max_error, ktime_t *vblank_time, + bool in_vblank_irq); + int vkms_output_init(struct vkms_device *vkmsdev); struct drm_plane *vkms_plane_init(struct vkms_device *vkmsdev); |