Modify the VKMS driver into an api that dce_virtual can use to create
virtual displays that obey drm's atomic modesetting api.
Signed-off-by: Ryan Taylor <Ryan.Taylor@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/Makefile | 1 +
drivers/gpu/drm/amd/amdgpu/amdgpu.h | 1 +
drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 2 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c | 2 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c | 410 +++++++++++++++++++++++
drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h | 29 ++
drivers/gpu/drm/amd/amdgpu/dce_virtual.c | 23 +-
7 files changed, 457 insertions(+), 11 deletions(-)
create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c
create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h
diff --git a/drivers/gpu/drm/amd/amdgpu/Makefile b/drivers/gpu/drm/amd/amdgpu/Makefile
index 7d292485ca7c..dfcf3b39a2f6 100644
--- a/drivers/gpu/drm/amd/amdgpu/Makefile
+++ b/drivers/gpu/drm/amd/amdgpu/Makefile
@@ -119,6 +119,7 @@ amdgpu-y += \
amdgpu-y += \
dce_v10_0.o \
dce_v11_0.o \
+ amdgpu_vkms.o \
dce_virtual.o
# add GFX block
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index d14b4968a026..a0198963fc8a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -912,6 +912,7 @@ struct amdgpu_device {
/* display */
bool enable_virtual_display;
+ struct amdgpu_vkms_output *amdgpu_vkms_output;
struct amdgpu_mode_info mode_info;
/* For pre-DCE11. DCE11 and later are in "struct amdgpu_device->dm" */
struct work_struct hotplug_work;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 179f2d01a082..5c774d6625e4 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -1222,7 +1222,7 @@ static int amdgpu_pci_probe(struct pci_dev *pdev,
int ret, retry = 0;
bool supports_atomic = false;
- if (!amdgpu_virtual_display &&
+ if (amdgpu_virtual_display ||
amdgpu_device_asic_has_dc_support(flags & AMD_ASIC_MASK))
supports_atomic = true;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
index 09b048647523..5a143ca02cf9 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
@@ -344,7 +344,7 @@ int amdgpu_fbdev_init(struct amdgpu_device *adev)
}
/* disable all the possible outputs/crtcs before entering KMS mode */
- if (!amdgpu_device_has_dc_support(adev))
+ if (!amdgpu_device_has_dc_support(adev) && !amdgpu_virtual_display)
drm_helper_disable_unused_functions(adev_to_drm(adev));
drm_fb_helper_initial_config(&rfbdev->helper, bpp_sel);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c
new file mode 100644
index 000000000000..58bd0d7b4602
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c
@@ -0,0 +1,410 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_simple_kms_helper.h>
+#include <drm/drm_vblank.h>
+
+#include "amdgpu.h"
+#include "amdgpu_vkms.h"
+#include "amdgpu_display.h"
+
+/**
+ * DOC: amdgpu_vkms
+ *
+ * The amdgpu vkms interface provides a virtual KMS interface for several use
+ * cases: devices without display hardware, platforms where the actual display
+ * hardware is not useful (e.g., servers), SR-IOV virtual functions, device
+ * emulation/simulation, and device bring up prior to display hardware being
+ * usable. We previously emulated a legacy KMS interface, but there was a desire
+ * to move to the atomic KMS interface. The vkms driver did everything we
+ * needed, but we wanted KMS support natively in the driver without buffer
+ * sharing and the ability to support an instance of VKMS per device. We first
+ * looked at splitting vkms into a stub driver and a helper module that other
+ * drivers could use to implement a virtual display, but this strategy ended up
+ * being messy due to driver specific callbacks needed for buffer management.
+ * Ultimately, it proved easier to import the vkms code as it mostly used core
+ * drm helpers anyway.
+ */
+
+static const u32 amdgpu_vkms_formats[] = {
+ DRM_FORMAT_XRGB8888,
+};
+
+static enum hrtimer_restart amdgpu_vkms_vblank_simulate(struct hrtimer *timer)
+{
+ struct amdgpu_vkms_output *output = container_of(timer,
+ struct amdgpu_vkms_output,
+ vblank_hrtimer);
+ struct drm_crtc *crtc = &output->crtc;
+ u64 ret_overrun;
+ bool ret;
+
+ ret_overrun = hrtimer_forward_now(&output->vblank_hrtimer,
+ output->period_ns);
+ WARN_ON(ret_overrun != 1);
+
+ ret = drm_crtc_handle_vblank(crtc);
+ if (!ret)
+ DRM_ERROR("amdgpu_vkms failure on handling vblank");
+
+ return HRTIMER_RESTART;
+}
+
+static int amdgpu_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 amdgpu_vkms_output *out = drm_crtc_to_amdgpu_vkms_output(crtc);
+
+ drm_calc_timestamping_constants(crtc, &crtc->mode);
+
+ hrtimer_init(&out->vblank_hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+ out->vblank_hrtimer.function = &amdgpu_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 amdgpu_vkms_disable_vblank(struct drm_crtc *crtc)
+{
+ struct amdgpu_vkms_output *out = drm_crtc_to_amdgpu_vkms_output(crtc);
+
+ hrtimer_cancel(&out->vblank_hrtimer);
+}
+
+static bool amdgpu_vkms_get_vblank_timestamp(struct drm_crtc *crtc,
+ int *max_error,
+ ktime_t *vblank_time,
+ bool in_vblank_irq)
+{
+ struct drm_device *dev = crtc->dev;
+ unsigned int pipe = crtc->index;
+ struct amdgpu_vkms_output *output = drm_crtc_to_amdgpu_vkms_output(crtc);
+ struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
+
+ if (!READ_ONCE(vblank->enabled)) {
+ *vblank_time = ktime_get();
+ return true;
+ }
+
+ *vblank_time = READ_ONCE(output->vblank_hrtimer.node.expires);
+
+ if (WARN_ON(*vblank_time == vblank->time))
+ return true;
+
+ /*
+ * To prevent races we roll the hrtimer forward before we do any
+ * interrupt processing - this is how real hw works (the interrupt is
+ * only generated after all the vblank registers are updated) and what
+ * the vblank core expects. Therefore we need to always correct the
+ * timestampe by one frame.
+ */
+ *vblank_time -= output->period_ns;
+
+ return true;
+}
+
+static const struct drm_crtc_funcs amdgpu_vkms_crtc_funcs = {
+ .set_config = drm_atomic_helper_set_config,
+ .destroy = drm_crtc_cleanup,
+ .page_flip = drm_atomic_helper_page_flip,
+ .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 = amdgpu_vkms_enable_vblank,
+ .disable_vblank = amdgpu_vkms_disable_vblank,
+ .get_vblank_timestamp = amdgpu_vkms_get_vblank_timestamp,
+};
+
+static void amdgpu_vkms_crtc_atomic_enable(struct drm_crtc *crtc,
+ struct drm_atomic_state *state)
+{
+ drm_crtc_vblank_on(crtc);
+}
+
+static void amdgpu_vkms_crtc_atomic_disable(struct drm_crtc *crtc,
+ struct drm_atomic_state *state)
+{
+ drm_crtc_vblank_off(crtc);
+}
+
+static void amdgpu_vkms_crtc_atomic_flush(struct drm_crtc *crtc,
+ struct drm_atomic_state *state)
+{
+ if (crtc->state->event) {
+ spin_lock(&crtc->dev->event_lock);
+
+ 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(&crtc->dev->event_lock);
+
+ crtc->state->event = NULL;
+ }
+}
+
+static const struct drm_crtc_helper_funcs amdgpu_vkms_crtc_helper_funcs = {
+ .atomic_flush = amdgpu_vkms_crtc_atomic_flush,
+ .atomic_enable = amdgpu_vkms_crtc_atomic_enable,
+ .atomic_disable = amdgpu_vkms_crtc_atomic_disable,
+};
+
+int amdgpu_vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
+ struct drm_plane *primary, struct drm_plane *cursor)
+{
+ int ret;
+
+ ret = drm_crtc_init_with_planes(dev, crtc, primary, cursor,
+ &amdgpu_vkms_crtc_funcs, NULL);
+ if (ret) {
+ DRM_ERROR("Failed to init CRTC\n");
+ return ret;
+ }
+
+ drm_crtc_helper_add(crtc, &amdgpu_vkms_crtc_helper_funcs);
+
+ return ret;
+}
+
+static const struct drm_connector_funcs amdgpu_vkms_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 amdgpu_vkms_conn_get_modes(struct drm_connector *connector)
+{
+ int count;
+
+ count = drm_add_modes_noedid(connector, XRES_MAX, YRES_MAX);
+ drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF);
+
+ return count;
+}
+
+static const struct drm_connector_helper_funcs amdgpu_vkms_conn_helper_funcs = {
+ .get_modes = amdgpu_vkms_conn_get_modes,
+};
+
+static const struct drm_plane_funcs amdgpu_vkms_plane_funcs = {
+ .update_plane = drm_atomic_helper_update_plane,
+ .disable_plane = drm_atomic_helper_disable_plane,
+ .destroy = drm_plane_cleanup,
+ .reset = drm_atomic_helper_plane_reset,
+ .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
+};
+
+static void amdgpu_vkms_plane_atomic_update(struct drm_plane *plane,
+ struct drm_plane_state *old_state)
+{
+ return;
+}
+
+static int amdgpu_vkms_plane_atomic_check(struct drm_plane *plane,
+ struct drm_plane_state *state)
+{
+ struct drm_crtc_state *crtc_state;
+ bool can_position = false;
+ int ret;
+
+ if (!state->fb || WARN_ON(!state->crtc))
+ return 0;
+
+ crtc_state = drm_atomic_get_crtc_state(state->state, state->crtc);
+ if (IS_ERR(crtc_state))
+ return PTR_ERR(crtc_state);
+
+ ret = drm_atomic_helper_check_plane_state(state, crtc_state,
+ DRM_PLANE_HELPER_NO_SCALING,
+ DRM_PLANE_HELPER_NO_SCALING,
+ can_position, true);
+ if (ret != 0)
+ return ret;
+
+ /* for now primary plane must be visible and full screen */
+ if (!state->visible && !can_position)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int amdgpu_vkms_prepare_fb(struct drm_plane *plane,
+ struct drm_plane_state *new_state)
+{
+ struct amdgpu_framebuffer *afb;
+ struct drm_gem_object *obj;
+ struct amdgpu_device *adev;
+ struct amdgpu_bo *rbo;
+ struct list_head list;
+ struct ttm_validate_buffer tv;
+ struct ww_acquire_ctx ticket;
+ uint32_t domain;
+ int r;
+
+ if (!new_state->fb) {
+ DRM_DEBUG_KMS("No FB bound\n");
+ return 0;
+ }
+ afb = to_amdgpu_framebuffer(new_state->fb);
+ obj = new_state->fb->obj[0];
+ rbo = gem_to_amdgpu_bo(obj);
+ adev = amdgpu_ttm_adev(rbo->tbo.bdev);
+ INIT_LIST_HEAD(&list);
+
+ tv.bo = &rbo->tbo;
+ tv.num_shared = 1;
+ list_add(&tv.head, &list);
+
+ r = ttm_eu_reserve_buffers(&ticket, &list, false, NULL);
+ if (r) {
+ dev_err(adev->dev, "fail to reserve bo (%d)\n", r);
+ return r;
+ }
+
+ if (plane->type != DRM_PLANE_TYPE_CURSOR)
+ domain = amdgpu_display_supported_domains(adev, rbo->flags);
+ else
+ domain = AMDGPU_GEM_DOMAIN_VRAM;
+
+ r = amdgpu_bo_pin(rbo, domain);
+ if (unlikely(r != 0)) {
+ if (r != -ERESTARTSYS)
+ DRM_ERROR("Failed to pin framebuffer with error %d\n", r);
+ ttm_eu_backoff_reservation(&ticket, &list);
+ return r;
+ }
+
+ r = amdgpu_ttm_alloc_gart(&rbo->tbo);
+ if (unlikely(r != 0)) {
+ amdgpu_bo_unpin(rbo);
+ ttm_eu_backoff_reservation(&ticket, &list);
+ DRM_ERROR("%p bind failed\n", rbo);
+ return r;
+ }
+
+ ttm_eu_backoff_reservation(&ticket, &list);
+
+ afb->address = amdgpu_bo_gpu_offset(rbo);
+
+ amdgpu_bo_ref(rbo);
+
+ return 0;
+}
+
+static void amdgpu_vkms_cleanup_fb(struct drm_plane *plane,
+ struct drm_plane_state *old_state)
+{
+ struct amdgpu_bo *rbo;
+ int r;
+
+ if (!old_state->fb)
+ return;
+
+ rbo = gem_to_amdgpu_bo(old_state->fb->obj[0]);
+ r = amdgpu_bo_reserve(rbo, false);
+ if (unlikely(r)) {
+ DRM_ERROR("failed to reserve rbo before unpin\n");
+ return;
+ }
+
+ amdgpu_bo_unpin(rbo);
+ amdgpu_bo_unreserve(rbo);
+ amdgpu_bo_unref(&rbo);
+}
+
+static const struct drm_plane_helper_funcs amdgpu_vkms_primary_helper_funcs = {
+ .atomic_update = amdgpu_vkms_plane_atomic_update,
+ .atomic_check = amdgpu_vkms_plane_atomic_check,
+ .prepare_fb = amdgpu_vkms_prepare_fb,
+ .cleanup_fb = amdgpu_vkms_cleanup_fb,
+};
+
+struct drm_plane *amdgpu_vkms_plane_init(struct drm_device *dev,
+ enum drm_plane_type type, int index)
+{
+ struct drm_plane *plane;
+ int ret;
+
+ plane = kzalloc(sizeof(*plane), GFP_KERNEL);
+ if (!plane)
+ return ERR_PTR(-ENOMEM);
+
+ ret = drm_universal_plane_init(dev, plane, 1 << index,
+ &amdgpu_vkms_plane_funcs,
+ amdgpu_vkms_formats,
+ ARRAY_SIZE(amdgpu_vkms_formats),
+ NULL, type, NULL);
+ if (ret) {
+ kfree(plane);
+ return ERR_PTR(ret);
+ }
+
+ drm_plane_helper_add(plane, &amdgpu_vkms_primary_helper_funcs);
+
+ return plane;
+}
+
+int amdgpu_vkms_output_init(struct drm_device *dev,
+ struct amdgpu_vkms_output *output, int index)
+{
+ struct drm_connector *connector = &output->connector;
+ struct drm_encoder *encoder = &output->encoder;
+ struct drm_crtc *crtc = &output->crtc;
+ struct drm_plane *primary, *cursor = NULL;
+ int ret;
+
+ primary = amdgpu_vkms_plane_init(dev, DRM_PLANE_TYPE_PRIMARY, index);
+ if (IS_ERR(primary))
+ return PTR_ERR(primary);
+
+ ret = amdgpu_vkms_crtc_init(dev, crtc, primary, cursor);
+ if (ret)
+ goto err_crtc;
+
+ ret = drm_connector_init(dev, connector, &amdgpu_vkms_connector_funcs,
+ DRM_MODE_CONNECTOR_VIRTUAL);
+ if (ret) {
+ DRM_ERROR("Failed to init connector\n");
+ goto err_connector;
+ }
+
+ drm_connector_helper_add(connector, &amdgpu_vkms_conn_helper_funcs);
+
+ ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_VIRTUAL);
+ if (ret) {
+ DRM_ERROR("Failed to init encoder\n");
+ goto err_encoder;
+ }
+ encoder->possible_crtcs = 1 << index;
+
+ ret = drm_connector_attach_encoder(connector, encoder);
+ if (ret) {
+ DRM_ERROR("Failed to attach connector to encoder\n");
+ goto err_attach;
+ }
+
+ drm_mode_config_reset(dev);
+
+ return 0;
+
+err_attach:
+ drm_encoder_cleanup(encoder);
+
+err_encoder:
+ drm_connector_cleanup(connector);
+
+err_connector:
+ drm_crtc_cleanup(crtc);
+
+err_crtc:
+ drm_plane_cleanup(primary);
+
+ return ret;
+}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h
new file mode 100644
index 000000000000..5dab51fbecf3
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h
@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+
+#ifndef _AMDGPU_VKMS_H_
+#define _AMDGPU_VKMS_H_
+
+#define XRES_DEF 1024
+#define YRES_DEF 764
+
+#define XRES_MAX 16384
+#define YRES_MAX 16384
+
+#define drm_crtc_to_amdgpu_vkms_output(target) \
+ container_of(target, struct amdgpu_vkms_output, crtc)
+
+extern const struct amdgpu_ip_block_version amdgpu_vkms_ip_block;
+
+struct amdgpu_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;
+};
+
+int amdgpu_vkms_output_init(struct drm_device *dev,
+ struct amdgpu_vkms_output *output, int index);
+
+#endif /* _AMDGPU_VKMS_H_ */
diff --git a/drivers/gpu/drm/amd/amdgpu/dce_virtual.c b/drivers/gpu/drm/amd/amdgpu/dce_virtual.c
index 7e0d8c092c7e..642c77533157 100644
--- a/drivers/gpu/drm/amd/amdgpu/dce_virtual.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_virtual.c
@@ -22,6 +22,7 @@
*/
#include <drm/drm_vblank.h>
+#include <drm/drm_atomic_helper.h>
#include "amdgpu.h"
#include "amdgpu_pm.h"
@@ -40,6 +41,7 @@
#include "dce_virtual.h"
#include "ivsrcid/ivsrcid_vislands30.h"
#include "amdgpu_display.h"
+#include "amdgpu_vkms.h"
#define DCE_VIRTUAL_VBLANK_PERIOD 16666666
@@ -374,6 +376,12 @@ static const struct drm_connector_funcs dce_virtual_connector_funcs = {
.force = dce_virtual_force,
};
+const struct drm_mode_config_funcs dce_virtual_mode_funcs = {
+ .fb_create = amdgpu_display_user_framebuffer_create,
+ .atomic_check = drm_atomic_helper_check,
+ .atomic_commit = drm_atomic_helper_commit,
+};
+
static int dce_virtual_sw_init(void *handle)
{
int r, i;
@@ -385,10 +393,10 @@ static int dce_virtual_sw_init(void *handle)
adev_to_drm(adev)->max_vblank_count = 0;
- adev_to_drm(adev)->mode_config.funcs = &amdgpu_mode_funcs;
+ adev_to_drm(adev)->mode_config.funcs = &dce_virtual_mode_funcs;
- adev_to_drm(adev)->mode_config.max_width = 16384;
- adev_to_drm(adev)->mode_config.max_height = 16384;
+ adev_to_drm(adev)->mode_config.max_width = XRES_MAX;
+ adev_to_drm(adev)->mode_config.max_height = YRES_MAX;
adev_to_drm(adev)->mode_config.preferred_depth = 24;
adev_to_drm(adev)->mode_config.prefer_shadow = 1;
@@ -399,15 +407,11 @@ static int dce_virtual_sw_init(void *handle)
if (r)
return r;
- adev_to_drm(adev)->mode_config.max_width = 16384;
- adev_to_drm(adev)->mode_config.max_height = 16384;
+ adev->amdgpu_vkms_output = kzalloc(sizeof(struct amdgpu_vkms_output) * adev->mode_info.num_crtc, GFP_KERNEL);
/* allocate crtcs, encoders, connectors */
for (i = 0; i < adev->mode_info.num_crtc; i++) {
- r = dce_virtual_crtc_init(adev, i);
- if (r)
- return r;
- r = dce_virtual_connector_encoder_init(adev, i);
+ r = amdgpu_vkms_output_init(adev_to_drm(adev), &adev->amdgpu_vkms_output[i], i);
if (r)
return r;
}
@@ -428,6 +432,7 @@ static int dce_virtual_sw_fini(void *handle)
hrtimer_cancel(&adev->mode_info.crtcs[i]->vblank_timer);
kfree(adev->mode_info.bios_hardcoded_edid);
+ kfree(adev->amdgpu_vkms_output);
drm_kms_helper_poll_fini(adev_to_drm(adev));
--
2.32.0
