[PATCH 09/13] drm/vkms: Allow to attach planes and CRTCs

José Expósito
2025-01-29T11:01:17Z

Add a list of possible CRTCs to the plane configuration and helpers to
attach, detach and get the primary and cursor planes attached to a CRTC.

Now that the default configuration has its planes and CRTC correctly
attached, configure the output following the configuration.

Signed-off-by: Louis Chauvet <louis.chauvet@bootlin.com>
Signed-off-by: José Expósito <jose.exposito89@gmail.com>
---
drivers/gpu/drm/vkms/tests/vkms_config_test.c | 185 ++++++++++++++++++
drivers/gpu/drm/vkms/vkms_config.c | 166 ++++++++++++++--
drivers/gpu/drm/vkms/vkms_config.h | 55 +++++-
drivers/gpu/drm/vkms/vkms_output.c | 77 ++++++--
4 files changed, 446 insertions(+), 37 deletions(-)

diff --git a/drivers/gpu/drm/vkms/tests/vkms_config_test.c b/drivers/gpu/drm/vkms/tests/vkms_config_test.c
index b5907b060a5c..5e698616491a 100644
--- a/drivers/gpu/drm/vkms/tests/vkms_config_test.c
+++ b/drivers/gpu/drm/vkms/tests/vkms_config_test.c
@@ -87,6 +87,18 @@ static void vkms_config_test_default_config(struct kunit *test)
KUNIT_EXPECT_EQ(test, vkms_config_crtc_get_writeback(crtc_cfg),
params->enable_writeback);

+ list_for_each_entry(plane_cfg, &config->planes, link) {
+ struct vkms_config_crtc *possible_crtc;
+ int n_possible_crtcs = 0;
+ unsigned long idx = 0;
+
+ xa_for_each(&plane_cfg->possible_crtcs, idx, possible_crtc) {
+ KUNIT_EXPECT_PTR_EQ(test, crtc_cfg, possible_crtc);
+ n_possible_crtcs++;
+ }
+ KUNIT_EXPECT_EQ(test, n_possible_crtcs, 1);
+ }
+
KUNIT_EXPECT_TRUE(test, vkms_config_is_valid(config));

vkms_config_destroy(config);
@@ -191,6 +203,8 @@ static void vkms_config_test_valid_plane_type(struct kunit *test)
{
struct vkms_config *config;
struct vkms_config_plane *plane_cfg;
+ struct vkms_config_crtc *crtc_cfg;
+ int err;

config = vkms_config_default_create(false, false, false);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, config);
@@ -198,16 +212,26 @@ static void vkms_config_test_valid_plane_type(struct kunit *test)
plane_cfg = list_first_entry(&config->planes, typeof(*plane_cfg), link);
vkms_config_destroy_plane(plane_cfg);

+ crtc_cfg = list_first_entry(&config->crtcs, typeof(*crtc_cfg), link);
+
/* Invalid: No primary plane */
plane_cfg = vkms_config_add_plane(config);
vkms_config_plane_set_type(plane_cfg, DRM_PLANE_TYPE_OVERLAY);
+ err = vkms_config_plane_attach_crtc(plane_cfg, crtc_cfg);
+ KUNIT_EXPECT_EQ(test, err, 0);
KUNIT_EXPECT_FALSE(test, vkms_config_is_valid(config));

/* Invalid: Multiple primary planes */
plane_cfg = vkms_config_add_plane(config);
vkms_config_plane_set_type(plane_cfg, DRM_PLANE_TYPE_PRIMARY);
+ err = vkms_config_plane_attach_crtc(plane_cfg, crtc_cfg);
+ KUNIT_EXPECT_EQ(test, err, 0);
+
plane_cfg = vkms_config_add_plane(config);
vkms_config_plane_set_type(plane_cfg, DRM_PLANE_TYPE_PRIMARY);
+ err = vkms_config_plane_attach_crtc(plane_cfg, crtc_cfg);
+ KUNIT_EXPECT_EQ(test, err, 0);
+
KUNIT_EXPECT_FALSE(test, vkms_config_is_valid(config));

/* Valid: One primary plane */
@@ -217,14 +241,50 @@ static void vkms_config_test_valid_plane_type(struct kunit *test)
/* Invalid: Multiple cursor planes */
plane_cfg = vkms_config_add_plane(config);
vkms_config_plane_set_type(plane_cfg, DRM_PLANE_TYPE_CURSOR);
+ err = vkms_config_plane_attach_crtc(plane_cfg, crtc_cfg);
+ KUNIT_EXPECT_EQ(test, err, 0);
+
plane_cfg = vkms_config_add_plane(config);
vkms_config_plane_set_type(plane_cfg, DRM_PLANE_TYPE_CURSOR);
+ err = vkms_config_plane_attach_crtc(plane_cfg, crtc_cfg);
+ KUNIT_EXPECT_EQ(test, err, 0);
+
KUNIT_EXPECT_FALSE(test, vkms_config_is_valid(config));

/* Valid: One primary and one cursor plane */
vkms_config_destroy_plane(plane_cfg);
KUNIT_EXPECT_TRUE(test, vkms_config_is_valid(config));

+ /* Invalid: Second CRTC without primary plane */
+ crtc_cfg = vkms_config_add_crtc(config);
+ KUNIT_EXPECT_FALSE(test, vkms_config_is_valid(config));
+
+ /* Valid: Second CRTC with a primary plane */
+ plane_cfg = vkms_config_add_plane(config);
+ vkms_config_plane_set_type(plane_cfg, DRM_PLANE_TYPE_PRIMARY);
+ err = vkms_config_plane_attach_crtc(plane_cfg, crtc_cfg);
+ KUNIT_EXPECT_EQ(test, err, 0);
+ KUNIT_EXPECT_TRUE(test, vkms_config_is_valid(config));
+
+ vkms_config_destroy(config);
+}
+
+static void vkms_config_test_valid_plane_possible_crtcs(struct kunit *test)
+{
+ struct vkms_config *config;
+ struct vkms_config_plane *plane_cfg;
+ struct vkms_config_crtc *crtc_cfg;
+
+ config = vkms_config_default_create(false, false, false);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, config);
+
+ plane_cfg = list_first_entry(&config->planes, typeof(*plane_cfg), link);
+ crtc_cfg = list_first_entry(&config->crtcs, typeof(*crtc_cfg), link);
+
+ /* Invalid: Primary plane without a possible CRTC */
+ vkms_config_plane_detach_crtc(plane_cfg, crtc_cfg);
+ KUNIT_EXPECT_FALSE(test, vkms_config_is_valid(config));
+
vkms_config_destroy(config);
}

@@ -251,6 +311,128 @@ static void vkms_config_test_valid_crtc_number(struct kunit *test)
vkms_config_destroy(config);
}

+static void vkms_config_test_plane_attach_crtc(struct kunit *test)
+{
+ struct vkms_config *config;
+ struct vkms_config_plane *overlay_cfg;
+ struct vkms_config_plane *primary_cfg;
+ struct vkms_config_plane *cursor_cfg;
+ struct vkms_config_crtc *crtc_cfg;
+ int err;
+
+ config = vkms_config_create("test");
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, config);
+
+ overlay_cfg = vkms_config_add_plane(config);
+ vkms_config_plane_set_type(overlay_cfg, DRM_PLANE_TYPE_OVERLAY);
+ primary_cfg = vkms_config_add_plane(config);
+ vkms_config_plane_set_type(primary_cfg, DRM_PLANE_TYPE_PRIMARY);
+ cursor_cfg = vkms_config_add_plane(config);
+ vkms_config_plane_set_type(cursor_cfg, DRM_PLANE_TYPE_CURSOR);
+
+ crtc_cfg = vkms_config_add_crtc(config);
+
+ /* No primary or cursor planes */
+ KUNIT_EXPECT_NULL(test, vkms_config_crtc_primary_plane(config, crtc_cfg));
+ KUNIT_EXPECT_NULL(test, vkms_config_crtc_cursor_plane(config, crtc_cfg));
+
+ /* Overlay plane, but no primary or cursor planes */
+ err = vkms_config_plane_attach_crtc(overlay_cfg, crtc_cfg);
+ KUNIT_EXPECT_EQ(test, err, 0);
+ KUNIT_EXPECT_NULL(test, vkms_config_crtc_primary_plane(config, crtc_cfg));
+ KUNIT_EXPECT_NULL(test, vkms_config_crtc_cursor_plane(config, crtc_cfg));
+
+ /* Primary plane, attaching it twice must fail */
+ err = vkms_config_plane_attach_crtc(primary_cfg, crtc_cfg);
+ KUNIT_EXPECT_EQ(test, err, 0);
+ err = vkms_config_plane_attach_crtc(primary_cfg, crtc_cfg);
+ KUNIT_EXPECT_NE(test, err, 0);
+ KUNIT_EXPECT_PTR_EQ(test,
+ vkms_config_crtc_primary_plane(config, crtc_cfg),
+ primary_cfg);
+ KUNIT_EXPECT_NULL(test, vkms_config_crtc_cursor_plane(config, crtc_cfg));
+
+ /* Primary and cursor planes */
+ err = vkms_config_plane_attach_crtc(cursor_cfg, crtc_cfg);
+ KUNIT_EXPECT_EQ(test, err, 0);
+ KUNIT_EXPECT_PTR_EQ(test,
+ vkms_config_crtc_primary_plane(config, crtc_cfg),
+ primary_cfg);
+ KUNIT_EXPECT_PTR_EQ(test,
+ vkms_config_crtc_cursor_plane(config, crtc_cfg),
+ cursor_cfg);
+
+ /* Detach primary and destroy cursor plane */
+ vkms_config_plane_detach_crtc(overlay_cfg, crtc_cfg);
+ vkms_config_plane_detach_crtc(primary_cfg, crtc_cfg);
+ vkms_config_destroy_plane(cursor_cfg);
+ KUNIT_EXPECT_NULL(test, vkms_config_crtc_primary_plane(config, crtc_cfg));
+ KUNIT_EXPECT_NULL(test, vkms_config_crtc_cursor_plane(config, crtc_cfg));
+
+ vkms_config_destroy(config);
+}
+
+static void vkms_config_test_plane_get_possible_crtcs(struct kunit *test)
+{
+ struct vkms_config *config;
+ struct vkms_config_plane *plane_cfg1, *plane_cfg2;
+ struct vkms_config_crtc *crtc_cfg1, *crtc_cfg2;
+ struct vkms_config_crtc **array;
+ size_t length;
+ int err;
+
+ config = vkms_config_create("test");
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, config);
+
+ plane_cfg1 = vkms_config_add_plane(config);
+ plane_cfg2 = vkms_config_add_plane(config);
+ crtc_cfg1 = vkms_config_add_crtc(config);
+ crtc_cfg2 = vkms_config_add_crtc(config);
+
+ /* No possible CRTCs */
+ array = vkms_config_plane_get_possible_crtcs(plane_cfg1, &length);
+ KUNIT_ASSERT_EQ(test, length, 0);
+ KUNIT_ASSERT_NULL(test, array);
+
+ array = vkms_config_plane_get_possible_crtcs(plane_cfg2, &length);
+ KUNIT_ASSERT_EQ(test, length, 0);
+ KUNIT_ASSERT_NULL(test, array);
+
+ /* Plane 1 attached to CRTC 1 and 2 */
+ err = vkms_config_plane_attach_crtc(plane_cfg1, crtc_cfg1);
+ KUNIT_EXPECT_EQ(test, err, 0);
+ err = vkms_config_plane_attach_crtc(plane_cfg1, crtc_cfg2);
+ KUNIT_EXPECT_EQ(test, err, 0);
+
+ array = vkms_config_plane_get_possible_crtcs(plane_cfg1, &length);
+ KUNIT_ASSERT_EQ(test, length, 2);
+ KUNIT_ASSERT_PTR_EQ(test, array[0], crtc_cfg1);
+ KUNIT_ASSERT_PTR_EQ(test, array[1], crtc_cfg2);
+ kfree(array);
+
+ array = vkms_config_plane_get_possible_crtcs(plane_cfg2, &length);
+ KUNIT_ASSERT_EQ(test, length, 0);
+ KUNIT_ASSERT_NULL(test, array);
+
+ /* Plane 1 attached to CRTC 1 and plane 2 to CRTC 2 */
+ vkms_config_plane_detach_crtc(plane_cfg1, crtc_cfg2);
+
+ array = vkms_config_plane_get_possible_crtcs(plane_cfg1, &length);
+ KUNIT_ASSERT_EQ(test, length, 1);
+ KUNIT_ASSERT_PTR_EQ(test, array[0], crtc_cfg1);
+ kfree(array);
+
+ err = vkms_config_plane_attach_crtc(plane_cfg2, crtc_cfg2);
+ KUNIT_EXPECT_EQ(test, err, 0);
+
+ array = vkms_config_plane_get_possible_crtcs(plane_cfg2, &length);
+ KUNIT_ASSERT_EQ(test, length, 1);
+ KUNIT_ASSERT_PTR_EQ(test, array[0], crtc_cfg2);
+ kfree(array);
+
+ vkms_config_destroy(config);
+}
+
static struct kunit_case vkms_config_test_cases[] = {
KUNIT_CASE(vkms_config_test_empty_config),
KUNIT_CASE_PARAM(vkms_config_test_default_config,
@@ -259,7 +441,10 @@ static struct kunit_case vkms_config_test_cases[] = {
KUNIT_CASE(vkms_config_test_get_crtcs),
KUNIT_CASE(vkms_config_test_valid_plane_number),
KUNIT_CASE(vkms_config_test_valid_plane_type),
+ KUNIT_CASE(vkms_config_test_valid_plane_possible_crtcs),
KUNIT_CASE(vkms_config_test_valid_crtc_number),
+ KUNIT_CASE(vkms_config_test_plane_attach_crtc),
+ KUNIT_CASE(vkms_config_test_plane_get_possible_crtcs),
{}
};

diff --git a/drivers/gpu/drm/vkms/vkms_config.c b/drivers/gpu/drm/vkms/vkms_config.c
index 4128892836d7..a2ce4905589b 100644
--- a/drivers/gpu/drm/vkms/vkms_config.c
+++ b/drivers/gpu/drm/vkms/vkms_config.c
@@ -50,13 +50,20 @@ struct vkms_config *vkms_config_default_create(bool enable_cursor,
goto err_alloc;
vkms_config_crtc_set_writeback(crtc_cfg, enable_writeback);

+ if (vkms_config_plane_attach_crtc(plane_cfg, crtc_cfg))
+ goto err_alloc;
+
if (enable_overlay) {
for (n = 0; n < NUM_OVERLAY_PLANES; n++) {
plane_cfg = vkms_config_add_plane(config);
if (IS_ERR(plane_cfg))
goto err_alloc;
+
vkms_config_plane_set_type(plane_cfg,
DRM_PLANE_TYPE_OVERLAY);
+
+ if (vkms_config_plane_attach_crtc(plane_cfg, crtc_cfg))
+ goto err_alloc;
}
}

@@ -64,7 +71,11 @@ struct vkms_config *vkms_config_default_create(bool enable_cursor,
plane_cfg = vkms_config_add_plane(config);
if (IS_ERR(plane_cfg))
goto err_alloc;
+
vkms_config_plane_set_type(plane_cfg, DRM_PLANE_TYPE_CURSOR);
+
+ if (vkms_config_plane_attach_crtc(plane_cfg, crtc_cfg))
+ goto err_alloc;
}

return config;
@@ -156,31 +167,39 @@ static bool valid_plane_number(struct vkms_config *config)
return true;
}

-static bool valid_plane_type(struct vkms_config *config)
+static bool valid_plane_type(struct vkms_config *config,
+ struct vkms_config_crtc *crtc_cfg)
{
struct vkms_config_plane *plane_cfg;
bool has_primary_plane = false;
bool has_cursor_plane = false;

list_for_each_entry(plane_cfg, &config->planes, link) {
+ struct vkms_config_crtc *possible_crtc;
+ unsigned long idx = 0;
enum drm_plane_type type;

type = vkms_config_plane_get_type(plane_cfg);

- if (type == DRM_PLANE_TYPE_PRIMARY) {
- if (has_primary_plane) {
- pr_err("Multiple primary planes\n");
- return false;
- }
+ xa_for_each(&plane_cfg->possible_crtcs, idx, possible_crtc) {
+ if (possible_crtc != crtc_cfg)
+ continue;

- has_primary_plane = true;
- } else if (type == DRM_PLANE_TYPE_CURSOR) {
- if (has_cursor_plane) {
- pr_err("Multiple cursor planes\n");
- return false;
- }
+ if (type == DRM_PLANE_TYPE_PRIMARY) {
+ if (has_primary_plane) {
+ pr_err("Multiple primary planes\n");
+ return false;
+ }

- has_cursor_plane = true;
+ has_primary_plane = true;
+ } else if (type == DRM_PLANE_TYPE_CURSOR) {
+ if (has_cursor_plane) {
+ pr_err("Multiple cursor planes\n");
+ return false;
+ }
+
+ has_cursor_plane = true;
+ }
}
}

@@ -192,6 +211,20 @@ static bool valid_plane_type(struct vkms_config *config)
return true;
}

+static bool valid_plane_possible_crtcs(struct vkms_config *config)
+{
+ struct vkms_config_plane *plane_cfg;
+
+ list_for_each_entry(plane_cfg, &config->planes, link) {
+ if (xa_empty(&plane_cfg->possible_crtcs)) {
+ pr_err("All planes must have at least one possible CRTC\n");
+ return false;
+ }
+ }
+
+ return true;
+}
+
static bool valid_crtc_number(struct vkms_config *config)
{
size_t n_crtcs;
@@ -207,15 +240,22 @@ static bool valid_crtc_number(struct vkms_config *config)

bool vkms_config_is_valid(struct vkms_config *config)
{
+ struct vkms_config_crtc *crtc_cfg;
+
if (!valid_plane_number(config))
return false;

if (!valid_crtc_number(config))
return false;

- if (!valid_plane_type(config))
+ if (!valid_plane_possible_crtcs(config))
return false;

+ list_for_each_entry(crtc_cfg, &config->crtcs, link) {
+ if (!valid_plane_type(config, crtc_cfg))
+ return false;
+ }
+
return true;
}

@@ -265,6 +305,7 @@ struct vkms_config_plane *vkms_config_add_plane(struct vkms_config *config)
return ERR_PTR(-ENOMEM);

vkms_config_plane_set_type(plane_cfg, DRM_PLANE_TYPE_OVERLAY);
+ xa_init_flags(&plane_cfg->possible_crtcs, XA_FLAGS_ALLOC);

list_add_tail(&plane_cfg->link, &config->planes);

@@ -273,10 +314,69 @@ struct vkms_config_plane *vkms_config_add_plane(struct vkms_config *config)

void vkms_config_destroy_plane(struct vkms_config_plane *plane_cfg)
{
+ xa_destroy(&plane_cfg->possible_crtcs);
list_del(&plane_cfg->link);
kfree(plane_cfg);
}

+int __must_check vkms_config_plane_attach_crtc(struct vkms_config_plane *plane_cfg,
+ struct vkms_config_crtc *crtc_cfg)
+{
+ struct vkms_config_crtc *possible_crtc;
+ unsigned long idx = 0;
+ u32 crtc_idx = 0;
+
+ xa_for_each(&plane_cfg->possible_crtcs, idx, possible_crtc) {
+ if (possible_crtc == crtc_cfg)
+ return -EINVAL;
+ }
+
+ return xa_alloc(&plane_cfg->possible_crtcs, &crtc_idx, crtc_cfg,
+ xa_limit_32b, GFP_KERNEL);
+}
+
+void vkms_config_plane_detach_crtc(struct vkms_config_plane *plane_cfg,
+ struct vkms_config_crtc *crtc_cfg)
+{
+ struct vkms_config_crtc *possible_crtc;
+ unsigned long idx = 0;
+
+ xa_for_each(&plane_cfg->possible_crtcs, idx, possible_crtc) {
+ if (possible_crtc == crtc_cfg)
+ xa_erase(&plane_cfg->possible_crtcs, idx);
+ }
+}
+
+struct vkms_config_crtc **vkms_config_plane_get_possible_crtcs(struct vkms_config_plane *plane_cfg,
+ size_t *out_length)
+{
+ struct vkms_config_crtc **array;
+ struct vkms_config_crtc *possible_crtc;
+ unsigned long idx;
+ size_t length = 0;
+ int n = 0;
+
+ xa_for_each(&plane_cfg->possible_crtcs, idx, possible_crtc)
+ length++;
+
+ if (length == 0) {
+ *out_length = length;
+ return NULL;
+ }
+
+ array = kmalloc_array(length, sizeof(*array), GFP_KERNEL);
+ if (!array)
+ return ERR_PTR(-ENOMEM);
+
+ xa_for_each(&plane_cfg->possible_crtcs, idx, possible_crtc) {
+ array[n] = possible_crtc;
+ n++;
+ }
+
+ *out_length = length;
+ return array;
+}
+
struct vkms_config_crtc *vkms_config_add_crtc(struct vkms_config *config)
{
struct vkms_config_crtc *crtc_cfg;
@@ -295,6 +395,44 @@ struct vkms_config_crtc *vkms_config_add_crtc(struct vkms_config *config)
void vkms_config_destroy_crtc(struct vkms_config *config,
struct vkms_config_crtc *crtc_cfg)
{
+ struct vkms_config_plane *plane_cfg;
+
+ list_for_each_entry(plane_cfg, &config->planes, link)
+ vkms_config_plane_detach_crtc(plane_cfg, crtc_cfg);
+
list_del(&crtc_cfg->link);
kfree(crtc_cfg);
}
+
+static struct vkms_config_plane *vkms_config_crtc_get_plane(const struct vkms_config *config,
+ struct vkms_config_crtc *crtc_cfg,
+ enum drm_plane_type type)
+{
+ struct vkms_config_plane *plane_cfg;
+ struct vkms_config_crtc *possible_crtc;
+ enum drm_plane_type current_type;
+ unsigned long idx;
+
+ list_for_each_entry(plane_cfg, &config->planes, link) {
+ current_type = vkms_config_plane_get_type(plane_cfg);
+
+ xa_for_each(&plane_cfg->possible_crtcs, idx, possible_crtc) {
+ if (possible_crtc == crtc_cfg && current_type == type)
+ return plane_cfg;
+ }
+ }
+
+ return NULL;
+}
+
+struct vkms_config_plane *vkms_config_crtc_primary_plane(const struct vkms_config *config,
+ struct vkms_config_crtc *crtc_cfg)
+{
+ return vkms_config_crtc_get_plane(config, crtc_cfg, DRM_PLANE_TYPE_PRIMARY);
+}
+
+struct vkms_config_plane *vkms_config_crtc_cursor_plane(const struct vkms_config *config,
+ struct vkms_config_crtc *crtc_cfg)
+{
+ return vkms_config_crtc_get_plane(config, crtc_cfg, DRM_PLANE_TYPE_CURSOR);
+}
diff --git a/drivers/gpu/drm/vkms/vkms_config.h b/drivers/gpu/drm/vkms/vkms_config.h
index a7828fe0c4b2..1f2e6c485d08 100644
--- a/drivers/gpu/drm/vkms/vkms_config.h
+++ b/drivers/gpu/drm/vkms/vkms_config.h
@@ -12,14 +12,12 @@
* struct vkms_config - General configuration for VKMS driver
*
* @dev_name: Name of the device
- * @writeback: If true, a writeback buffer can be attached to the CRTC
* @planes: List of planes configured for the device
* @crtcs: List of CRTCs configured for the device
* @dev: Used to store the current VKMS device. Only set when the device is instantiated.
*/
struct vkms_config {
const char *dev_name;
- bool writeback;
struct list_head planes;
struct list_head crtcs;
struct vkms_device *dev;
@@ -31,6 +29,7 @@ struct vkms_config {
* @link: Link to the others planes in vkms_config
* @type: Type of the plane. The creator of configuration needs to ensures that
* at least one primary plane is present.
+ * @possible_crtcs: Array of CRTCs that can be used with this plane
* @plane: Internal usage. This pointer should never be considered as valid.
* It can be used to store a temporary reference to a VKMS plane during
* device creation. This pointer is not managed by the configuration and
@@ -40,6 +39,7 @@ struct vkms_config_plane {
struct list_head link;

enum drm_plane_type type;
+ struct xarray possible_crtcs;

/* Internal usage */
struct vkms_plane *plane;
@@ -194,6 +194,35 @@ vkms_config_plane_set_type(struct vkms_config_plane *plane_cfg,
plane_cfg->type = type;
}

+/**
+ * vkms_config_plane_attach_crtc - Attach a plane to a CRTC
+ * @plane_cfg: Plane to attach
+ * @crtc_cfg: CRTC to attach @plane_cfg to
+ */
+int __must_check vkms_config_plane_attach_crtc(struct vkms_config_plane *plane_cfg,
+ struct vkms_config_crtc *crtc_cfg);
+
+/**
+ * vkms_config_plane_attach_crtc - Detach a plane from a CRTC
+ * @plane_cfg: Plane to detach
+ * @crtc_cfg: CRTC to detach @plane_cfg from
+ */
+void vkms_config_plane_detach_crtc(struct vkms_config_plane *plane_cfg,
+ struct vkms_config_crtc *crtc_cfg);
+
+/**
+ * vkms_config_plane_get_possible_crtcs() - Return the array of possible CRTCs
+ * @plane_cfg: Plane to get the possible CRTCs from
+ * @out_length: Length of the returned array
+ *
+ * Returns:
+ * A list of pointers to the configurations. On success, the caller is
+ * responsible to free the returned array, but not its contents. On error,
+ * it returns an error and @out_length is invalid.
+ */
+struct vkms_config_crtc **vkms_config_plane_get_possible_crtcs(struct vkms_config_plane *plane_cfg,
+ size_t *out_length);
+
/**
* vkms_config_add_crtc() - Add a new CRTC configuration
* @config: Configuration to add the CRTC to
@@ -234,4 +263,26 @@ vkms_config_crtc_set_writeback(struct vkms_config_crtc *crtc_cfg,
crtc_cfg->writeback = writeback;
}

+/**
+ * vkms_config_crtc_primary_plane() - Return the primary plane for a CRTC
+ * @config: Configuration containing the CRTC
+ * @crtc_config: Target CRTC
+ *
+ * Returns:
+ * The primary plane or NULL if none is assigned yet.
+ */
+struct vkms_config_plane *vkms_config_crtc_primary_plane(const struct vkms_config *config,
+ struct vkms_config_crtc *crtc_cfg);
+
+/**
+ * vkms_config_crtc_cursor_plane() - Return the cursor plane for a CRTC
+ * @config: Configuration containing the CRTC
+ * @crtc_config: Target CRTC
+ *
+ * Returns:
+ * The cursor plane or NULL if none is assigned yet.
+ */
+struct vkms_config_plane *vkms_config_crtc_cursor_plane(const struct vkms_config *config,
+ struct vkms_config_crtc *crtc_cfg);
+
#endif /* _VKMS_CONFIG_H_ */
diff --git a/drivers/gpu/drm/vkms/vkms_output.c b/drivers/gpu/drm/vkms/vkms_output.c
index b2ae269e5827..427d0aad8901 100644
--- a/drivers/gpu/drm/vkms/vkms_output.c
+++ b/drivers/gpu/drm/vkms/vkms_output.c
@@ -10,18 +10,24 @@ int vkms_output_init(struct vkms_device *vkmsdev)
struct drm_device *dev = &vkmsdev->drm;
struct vkms_connector *connector;
struct drm_encoder *encoder;
- struct vkms_output *output;
- struct vkms_plane *primary = NULL, *cursor = NULL;
struct vkms_config_plane **plane_cfgs = NULL;
size_t n_planes;
+ struct vkms_config_crtc **crtc_cfgs = NULL;
+ size_t n_crtcs;
int ret = 0;
int writeback;
- unsigned int n;
+ unsigned int n, i;

plane_cfgs = vkms_config_get_planes(vkmsdev->config, &n_planes);
if (IS_ERR(plane_cfgs))
return PTR_ERR(plane_cfgs);

+ crtc_cfgs = vkms_config_get_crtcs(vkmsdev->config, &n_crtcs);
+ if (IS_ERR(crtc_cfgs)) {
+ ret = PTR_ERR(crtc_cfgs);
+ goto err_free;
+ }
+
for (n = 0; n < n_planes; n++) {
struct vkms_config_plane *plane_cfg;
enum drm_plane_type type;
@@ -35,19 +41,54 @@ int vkms_output_init(struct vkms_device *vkmsdev)
ret = PTR_ERR(plane_cfg->plane);
goto err_free;
}
+ }
+
+ for (n = 0; n < n_crtcs; n++) {
+ struct vkms_config_crtc *crtc_cfg;
+ struct vkms_config_plane *primary, *cursor;
+
+ crtc_cfg = crtc_cfgs[n];
+ primary = vkms_config_crtc_primary_plane(vkmsdev->config, crtc_cfg);
+ cursor = vkms_config_crtc_cursor_plane(vkmsdev->config, crtc_cfg);
+
+ crtc_cfg->crtc = vkms_crtc_init(dev, &primary->plane->base,
+ cursor ? &cursor->plane->base : NULL);
+ if (IS_ERR(crtc_cfg->crtc)) {
+ DRM_ERROR("Failed to allocate CRTC\n");
+ ret = PTR_ERR(crtc_cfg->crtc);
+ goto err_free;
+ }

- if (type == DRM_PLANE_TYPE_PRIMARY)
- primary = plane_cfg->plane;
- else if (type == DRM_PLANE_TYPE_CURSOR)
- cursor = plane_cfg->plane;
+ /* Initialize the writeback component */
+ if (vkms_config_crtc_get_writeback(crtc_cfg)) {
+ writeback = vkms_enable_writeback_connector(vkmsdev, crtc_cfg->crtc);
+ if (writeback)
+ DRM_ERROR("Failed to init writeback connector\n");
+ }
}

- output = vkms_crtc_init(dev, &primary->base,
- cursor ? &cursor->base : NULL);
- if (IS_ERR(output)) {
- DRM_ERROR("Failed to allocate CRTC\n");
- ret = PTR_ERR(output);
- goto err_free;
+ for (n = 0; n < n_planes; n++) {
+ struct vkms_config_plane *plane_cfg;
+ struct vkms_config_crtc **possible_crtcs;
+ size_t n_possible_crtcs;
+
+ plane_cfg = plane_cfgs[n];
+ possible_crtcs = vkms_config_plane_get_possible_crtcs(plane_cfg,
+ &n_possible_crtcs);
+ if (IS_ERR(possible_crtcs)) {
+ ret = PTR_ERR(possible_crtcs);
+ goto err_free;
+ }
+
+ for (i = 0; i < n_possible_crtcs; i++) {
+ struct vkms_config_crtc *possible_crtc;
+
+ possible_crtc = possible_crtcs[i];
+ plane_cfg->plane->base.possible_crtcs |=
+ drm_crtc_mask(&possible_crtc->crtc->crtc);
+ }
+
+ kfree(possible_crtcs);
}

connector = vkms_connector_init(vkmsdev);
@@ -69,7 +110,7 @@ int vkms_output_init(struct vkms_device *vkmsdev)
DRM_ERROR("Failed to init encoder\n");
goto err_free;
}
- encoder->possible_crtcs = drm_crtc_mask(&output->crtc);
+ encoder->possible_crtcs = drm_crtc_mask(&crtc_cfgs[0]->crtc->crtc);

/* Attach the encoder and the connector */
ret = drm_connector_attach_encoder(&connector->base, encoder);
@@ -78,17 +119,11 @@ int vkms_output_init(struct vkms_device *vkmsdev)
goto err_free;
}

- /* Initialize the writeback component */
- if (vkmsdev->config->writeback) {
- writeback = vkms_enable_writeback_connector(vkmsdev, output);
- if (writeback)
- DRM_ERROR("Failed to init writeback connector\n");
- }
-
drm_mode_config_reset(dev);

err_free:
kfree(plane_cfgs);
+ kfree(crtc_cfgs);

return ret;
}
--
2.48.1