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From d4a07893647a45787b711598287b29a7003a4111 Mon Sep 17 00:00:00 2001
From: Leo Li <sunpeng.li@amd.com>
Date: Tue, 27 Nov 2018 15:05:12 -0500
Subject: [PATCH 1021/2940] drm/amd/display: Fix driver load crash in amdgpu_dm
[Why]
This fixes an regression introduced by:
drm/amd/display: add stream ID and otg instance in dc_stream_state
During driver initialization, a null pointer deref is raised. This is
caused by searching for a stream status in the dc->current_state before
the dc_state swap happens at the end of dc_commit_state_no_check().
Since the swap has not happened, the dc_state to be swapped in should
be searched, and not dc->current_state.
[How]
Add a function that searches for the stream status within the given
dc_state, instead of dc->current_state. Use that before the state swap
happens in dc_commit_state_no_check().
Also remove duplicate occurrences of this function in amdgpu_dm.c.
Signed-off-by: Leo Li <sunpeng.li@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Chaudhary Amit Kumar <Chaudharyamit.Kumar@amd.com>
---
.../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 22 +++----------
drivers/gpu/drm/amd/display/dc/core/dc.c | 2 +-
.../gpu/drm/amd/display/dc/core/dc_stream.c | 32 ++++++++++++++++---
drivers/gpu/drm/amd/display/dc/dc_stream.h | 3 ++
4 files changed, 35 insertions(+), 24 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 09acccfbffec..762a0d28e92c 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -4489,20 +4489,6 @@ static void prepare_flip_isr(struct amdgpu_crtc *acrtc)
acrtc->crtc_id);
}
-struct dc_stream_status *dc_state_get_stream_status(
- struct dc_state *state,
- struct dc_stream_state *stream)
-{
- uint8_t i;
-
- for (i = 0; i < state->stream_count; i++) {
- if (stream == state->streams[i])
- return &state->stream_status[i];
- }
-
- return NULL;
-}
-
static void update_freesync_state_on_stream(
struct amdgpu_display_manager *dm,
struct dm_crtc_state *new_crtc_state,
@@ -5108,8 +5094,8 @@ static void amdgpu_dm_atomic_commit_tail(struct drm_atomic_state *state)
dc_stream_get_status(dm_new_crtc_state->stream);
if (!status)
- status = dc_state_get_stream_status(dc_state,
- dm_new_crtc_state->stream);
+ status = dc_stream_get_status_from_state(dc_state,
+ dm_new_crtc_state->stream);
if (!status)
DC_ERR("got no status for stream %p on acrtc%p\n", dm_new_crtc_state->stream, acrtc);
@@ -5872,8 +5858,8 @@ dm_determine_update_type_for_commit(struct dc *dc,
goto cleanup;
}
- status = dc_state_get_stream_status(old_dm_state->context,
- new_dm_crtc_state->stream);
+ status = dc_stream_get_status_from_state(old_dm_state->context,
+ new_dm_crtc_state->stream);
update_type = dc_check_update_surfaces_for_stream(dc, updates, num_plane,
&stream_update, status);
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index d0971df201c8..1f6db8a147db 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -1071,7 +1071,7 @@ static enum dc_status dc_commit_state_no_check(struct dc *dc, struct dc_state *c
}
}
- status = dc_stream_get_status(context->streams[i]);
+ status = dc_stream_get_status_from_state(context, context->streams[i]);
context->streams[i]->out.otg_offset = status->primary_otg_inst;
CONN_MSG_MODE(link, "{%dx%d, %dx%d@%dKhz}",
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_stream.c b/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
index e498a9aa8035..996298c35f42 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
@@ -160,20 +160,42 @@ struct dc_stream_state *dc_create_stream_for_sink(
return stream;
}
-struct dc_stream_status *dc_stream_get_status(
+/**
+ * dc_stream_get_status_from_state - Get stream status from given dc state
+ * @state: DC state to find the stream status in
+ * @stream: The stream to get the stream status for
+ *
+ * The given stream is expected to exist in the given dc state. Otherwise, NULL
+ * will be returned.
+ */
+struct dc_stream_status *dc_stream_get_status_from_state(
+ struct dc_state *state,
struct dc_stream_state *stream)
{
uint8_t i;
- struct dc *dc = stream->ctx->dc;
- for (i = 0; i < dc->current_state->stream_count; i++) {
- if (stream == dc->current_state->streams[i])
- return &dc->current_state->stream_status[i];
+ for (i = 0; i < state->stream_count; i++) {
+ if (stream == state->streams[i])
+ return &state->stream_status[i];
}
return NULL;
}
+/**
+ * dc_stream_get_status() - Get current stream status of the given stream state
+ * @stream: The stream to get the stream status for.
+ *
+ * The given stream is expected to exist in dc->current_state. Otherwise, NULL
+ * will be returned.
+ */
+struct dc_stream_status *dc_stream_get_status(
+ struct dc_stream_state *stream)
+{
+ struct dc *dc = stream->ctx->dc;
+ return dc_stream_get_status_from_state(dc->current_state, stream);
+}
+
/**
* dc_stream_set_cursor_attributes() - Update cursor attributes and set cursor surface address
*/
diff --git a/drivers/gpu/drm/amd/display/dc/dc_stream.h b/drivers/gpu/drm/amd/display/dc/dc_stream.h
index 1e1e89e7c2c5..bfb741b980fb 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_stream.h
+++ b/drivers/gpu/drm/amd/display/dc/dc_stream.h
@@ -278,6 +278,9 @@ void update_stream_signal(struct dc_stream_state *stream, struct dc_sink *sink);
void dc_stream_retain(struct dc_stream_state *dc_stream);
void dc_stream_release(struct dc_stream_state *dc_stream);
+struct dc_stream_status *dc_stream_get_status_from_state(
+ struct dc_state *state,
+ struct dc_stream_state *stream);
struct dc_stream_status *dc_stream_get_status(
struct dc_stream_state *dc_stream);
--
2.17.1
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