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Message-ID: <20210224105509.yzdimgbu2jwe3auf@adolin>
Date: Wed, 24 Feb 2021 16:25:09 +0530
From: Sumera Priyadarsini <sylphrenadin@...il.com>
To: melissa.srw@...il.com
Cc: daniel@...ll.ch, rodrigosiqueiramelo@...il.com,
hamohammed.sa@...il.com, airlied@...ux.ie,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH] drm/vkms: Add support for virtual hardware mode
Add a virtual hardware or vblank-less mode as a module to enable
VKMS to emulate virtual graphic drivers. This mode can be enabled
by setting enable_virtual_hw=1 at the time of loading VKMS.
A new function vkms_crtc_composer() has been added to bypass the
vblank mode and is called directly in the atomic hook in
vkms_atomic_begin(). However, some crc captures still use vblanks
which causes the crc-based igt tests to crash. Currently, I am unsure
about how to approach one-shot implementation of crc reads so I am
still working on that.
This patch has been tested with the igt tests, kms_writeback, kms_atomic,
kms_lease, kms_flip, kms_pipe_get_crc and preserves results except for
subtests related to crc reads and skips tests that rely on vertical
blanking. This patch must be tested after incorporating the
igt-tests patch: https://lists.freedesktop.org/archives/igt-dev/2021-February/029355.html .
The patch is based on Rodrigo Siqueira's
patch(https://patchwork.freedesktop.org/patch/316851/?series=48469&rev=3)
and the ensuing review.
Signed-off-by: Sumera Priyadarsini <sylphrenadin@...il.com>
---
drivers/gpu/drm/vkms/vkms_composer.c | 46 ++++++++++++++++++++++++++++
drivers/gpu/drm/vkms/vkms_crtc.c | 17 ++++++++--
drivers/gpu/drm/vkms/vkms_drv.c | 18 ++++++++---
drivers/gpu/drm/vkms/vkms_drv.h | 2 ++
4 files changed, 75 insertions(+), 8 deletions(-)
diff --git a/drivers/gpu/drm/vkms/vkms_composer.c b/drivers/gpu/drm/vkms/vkms_composer.c
index 66c6842d70db..7a8aaf5c5555 100644
--- a/drivers/gpu/drm/vkms/vkms_composer.c
+++ b/drivers/gpu/drm/vkms/vkms_composer.c
@@ -247,6 +247,52 @@ void vkms_composer_worker(struct work_struct *work)
drm_crtc_add_crc_entry(crtc, true, frame_start++, &crc32);
}
+void vkms_crtc_composer(struct vkms_crtc_state *crtc_state)
+{
+ struct drm_crtc *crtc = crtc_state->base.crtc;
+ struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
+ struct vkms_composer *primary_composer = NULL;
+ struct vkms_composer *cursor_composer = NULL;
+ void *vaddr_out = NULL;
+ u32 crc32 = 0;
+ int ret;
+ bool wb_pending;
+
+ wb_pending = crtc_state->wb_pending;
+
+ if (crtc_state->num_active_planes >= 1)
+ primary_composer = crtc_state->active_planes[0]->composer;
+
+ if (crtc_state->num_active_planes == 2)
+ cursor_composer = crtc_state->active_planes[1]->composer;
+
+ if (!primary_composer)
+ return;
+
+ if (wb_pending)
+ vaddr_out = crtc_state->active_writeback;
+
+ ret = compose_planes(&vaddr_out, primary_composer, cursor_composer);
+ if (ret) {
+ if (ret == -EINVAL && !wb_pending)
+ kfree(vaddr_out);
+ return;
+ }
+
+ crc32 = compute_crc(vaddr_out, primary_composer);
+
+ if (wb_pending) {
+ drm_writeback_signal_completion(&out->wb_connector, 0);
+ spin_lock_irq(&out->composer_lock);
+ crtc_state->wb_pending = false;
+ spin_unlock_irq(&out->composer_lock);
+ } else {
+ kfree(vaddr_out);
+ }
+
+ drm_crtc_add_crc_entry(crtc, true, 0, &crc32);
+}
+
static const char * const pipe_crc_sources[] = {"auto"};
const char *const *vkms_get_crc_sources(struct drm_crtc *crtc,
diff --git a/drivers/gpu/drm/vkms/vkms_crtc.c b/drivers/gpu/drm/vkms/vkms_crtc.c
index 6164349cdf11..38de791a4882 100644
--- a/drivers/gpu/drm/vkms/vkms_crtc.c
+++ b/drivers/gpu/drm/vkms/vkms_crtc.c
@@ -224,13 +224,19 @@ static int vkms_crtc_atomic_check(struct drm_crtc *crtc,
static void vkms_crtc_atomic_enable(struct drm_crtc *crtc,
struct drm_atomic_state *state)
{
- drm_crtc_vblank_on(crtc);
+ struct vkms_device *vkmsdev = drm_device_to_vkms_device(crtc->dev);
+
+ if (!vkmsdev->config->virtual_hw)
+ drm_crtc_vblank_on(crtc);
}
static void vkms_crtc_atomic_disable(struct drm_crtc *crtc,
struct drm_atomic_state *state)
{
- drm_crtc_vblank_off(crtc);
+ struct vkms_device *vkmsdev = drm_device_to_vkms_device(crtc->dev);
+
+ if (!vkmsdev->config->virtual_hw)
+ drm_crtc_vblank_off(crtc);
}
static void vkms_crtc_atomic_begin(struct drm_crtc *crtc,
@@ -248,8 +254,13 @@ static void vkms_crtc_atomic_flush(struct drm_crtc *crtc,
struct drm_atomic_state *state)
{
struct vkms_output *vkms_output = drm_crtc_to_vkms_output(crtc);
+ struct vkms_crtc_state *vkms_state = to_vkms_crtc_state(crtc->state);
+ struct vkms_device *vkmsdev = drm_device_to_vkms_device(crtc->dev);
+
+ if (vkmsdev->config->virtual_hw)
+ vkms_crtc_composer(vkms_state);
- if (crtc->state->event) {
+ if (crtc->state->event && !vkmsdev->config->virtual_hw) {
spin_lock(&crtc->dev->event_lock);
if (drm_crtc_vblank_get(crtc) != 0)
diff --git a/drivers/gpu/drm/vkms/vkms_drv.c b/drivers/gpu/drm/vkms/vkms_drv.c
index 2173b82606f6..945c4495d62a 100644
--- a/drivers/gpu/drm/vkms/vkms_drv.c
+++ b/drivers/gpu/drm/vkms/vkms_drv.c
@@ -44,6 +44,11 @@ static bool enable_writeback = true;
module_param_named(enable_writeback, enable_writeback, bool, 0444);
MODULE_PARM_DESC(enable_writeback, "Enable/Disable writeback connector support");
+static bool enable_virtual_hw = false;
+module_param_named(enable_virtual_hw, enable_virtual_hw, bool, 0444);
+MODULE_PARM_DESC(enable_virtual_hw, "Enable/Disable virtual hardware mode(virtual \
+hardware mode disables vblank interrupts)");
+
DEFINE_DRM_GEM_FOPS(vkms_driver_fops);
static void vkms_release(struct drm_device *dev)
@@ -159,12 +164,14 @@ static int vkms_create(struct vkms_config *config)
goto out_devres;
}
- vkms_device->drm.irq_enabled = true;
+ vkms_device->drm.irq_enabled = !vkms_device->config->virtual_hw;
- ret = drm_vblank_init(&vkms_device->drm, 1);
- if (ret) {
- DRM_ERROR("Failed to vblank\n");
- goto out_devres;
+ if (!vkms_device->config->virtual_hw) {
+ ret = drm_vblank_init(&vkms_device->drm, 1);
+ if (ret) {
+ DRM_ERROR("Failed to vblank\n");
+ goto out_devres;
+ }
}
ret = vkms_modeset_init(vkms_device);
@@ -198,6 +205,7 @@ static int __init vkms_init(void)
config->cursor = enable_cursor;
config->writeback = enable_writeback;
+ config->virtual_hw = enable_virtual_hw;
return vkms_create(config);
}
diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
index 35540c7c4416..d4a45518639c 100644
--- a/drivers/gpu/drm/vkms/vkms_drv.h
+++ b/drivers/gpu/drm/vkms/vkms_drv.h
@@ -85,6 +85,7 @@ struct vkms_device;
struct vkms_config {
bool writeback;
bool cursor;
+ bool virtual_hw;
/* only set when instantiated */
struct vkms_device *dev;
};
@@ -127,6 +128,7 @@ int vkms_verify_crc_source(struct drm_crtc *crtc, const char *source_name,
/* Composer Support */
void vkms_composer_worker(struct work_struct *work);
void vkms_set_composer(struct vkms_output *out, bool enabled);
+void vkms_crtc_composer(struct vkms_crtc_state *crtc_state);
/* Writeback */
int vkms_enable_writeback_connector(struct vkms_device *vkmsdev);
--
2.25.1
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