linux-kernel - [PATCH AUTOSEL 5.4 074/108] drm/msm: devcoredump should dump MSM_SUBMIT_BO

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Date:   Sat, 11 Apr 2020 19:09:09 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Rob Clark <robdclark@...omium.org>,
        Jordan Crouse <jcrouse@...eaurora.org>,
        Sasha Levin <sashal@...nel.org>, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.4 074/108] drm/msm: devcoredump should dump MSM_SUBMIT_BO_DUMP buffers

From: Rob Clark <robdclark@...omium.org>

[ Upstream commit e515af8d4a6f18f96c360724568a7497868101a8 ]

Also log buffers with the DUMP flag set, to ensure we capture all useful
cmdstream in crashdump state with modern mesa.

Otherwise we miss out on the contents of "state object" cmdstream
buffers.

v2: add missing 'inline'

Signed-off-by: Rob Clark <robdclark@...omium.org>
Reviewed-by: Jordan Crouse <jcrouse@...eaurora.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/msm/msm_gem.h | 10 ++++++++++
 drivers/gpu/drm/msm/msm_gpu.c | 28 +++++++++++++++++++++++-----
 drivers/gpu/drm/msm/msm_rd.c  |  8 +-------
 3 files changed, 34 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_gem.h b/drivers/gpu/drm/msm/msm_gem.h
index 9e0953c2b7cea..dcee0e223ed86 100644
--- a/drivers/gpu/drm/msm/msm_gem.h
+++ b/drivers/gpu/drm/msm/msm_gem.h
@@ -160,4 +160,14 @@ struct msm_gem_submit {
 	} bos[0];
 };
 
+/* helper to determine of a buffer in submit should be dumped, used for both
+ * devcoredump and debugfs cmdstream dumping:
+ */
+static inline bool
+should_dump(struct msm_gem_submit *submit, int idx)
+{
+	extern bool rd_full;
+	return rd_full || (submit->bos[idx].flags & MSM_SUBMIT_BO_DUMP);
+}
+
 #endif /* __MSM_GEM_H__ */
diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index edd45f434ccd6..aea93e5035758 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -355,16 +355,34 @@ static void msm_gpu_crashstate_capture(struct msm_gpu *gpu,
 	state->cmd = kstrdup(cmd, GFP_KERNEL);
 
 	if (submit) {
-		int i;
-
-		state->bos = kcalloc(submit->nr_cmds,
+		int i, nr = 0;
+
+		/* count # of buffers to dump: */
+		for (i = 0; i < submit->nr_bos; i++)
+			if (should_dump(submit, i))
+				nr++;
+		/* always dump cmd bo's, but don't double count them: */
+		for (i = 0; i < submit->nr_cmds; i++)
+			if (!should_dump(submit, submit->cmd[i].idx))
+				nr++;
+
+		state->bos = kcalloc(nr,
 			sizeof(struct msm_gpu_state_bo), GFP_KERNEL);
 
+		for (i = 0; i < submit->nr_bos; i++) {
+			if (should_dump(submit, i)) {
+				msm_gpu_crashstate_get_bo(state, submit->bos[i].obj,
+					submit->bos[i].iova, submit->bos[i].flags);
+			}
+		}
+
 		for (i = 0; state->bos && i < submit->nr_cmds; i++) {
 			int idx = submit->cmd[i].idx;
 
-			msm_gpu_crashstate_get_bo(state, submit->bos[idx].obj,
-				submit->bos[idx].iova, submit->bos[idx].flags);
+			if (!should_dump(submit, submit->cmd[i].idx)) {
+				msm_gpu_crashstate_get_bo(state, submit->bos[idx].obj,
+					submit->bos[idx].iova, submit->bos[idx].flags);
+			}
 		}
 	}
 
diff --git a/drivers/gpu/drm/msm/msm_rd.c b/drivers/gpu/drm/msm/msm_rd.c
index c7832a951039f..4acebaefaed74 100644
--- a/drivers/gpu/drm/msm/msm_rd.c
+++ b/drivers/gpu/drm/msm/msm_rd.c
@@ -43,7 +43,7 @@
 #include "msm_gpu.h"
 #include "msm_gem.h"
 
-static bool rd_full = false;
+bool rd_full = false;
 MODULE_PARM_DESC(rd_full, "If true, $debugfs/.../rd will snapshot all buffer contents");
 module_param_named(rd_full, rd_full, bool, 0600);
 
@@ -333,12 +333,6 @@ static void snapshot_buf(struct msm_rd_state *rd,
 	msm_gem_put_vaddr(&obj->base);
 }
 
-static bool
-should_dump(struct msm_gem_submit *submit, int idx)
-{
-	return rd_full || (submit->bos[idx].flags & MSM_SUBMIT_BO_DUMP);
-}
-
 /* called under struct_mutex */
 void msm_rd_dump_submit(struct msm_rd_state *rd, struct msm_gem_submit *submit,
 		const char *fmt, ...)
-- 
2.20.1