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48 lines
1.8 KiB
Diff
48 lines
1.8 KiB
Diff
From 9edce560e4263934e0a0811d06c78278688b1792 Mon Sep 17 00:00:00 2001
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From: Maxime Ripard <maxime@cerno.tech>
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Date: Wed, 25 Jan 2023 13:05:26 +0100
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Subject: [PATCH] drm/vc4: hvs: Destroy dlist allocations immediately when
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running a test
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When running a kunit test, the driver runs with a mock device. As such,
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any attempt to read or write to a hardware register will fail the
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current test immediately.
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The dlist allocation management recently introduced will read the
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current frame count from the HVS to defer its destruction until a
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subsequent frame has been output. This obviously involves a register
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read that fails the Kunit tests.
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Change the destruction deferral function to destroy the allocation
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immediately if we run under kunit. This is essentially harmless since
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the main reason for that deferall is to prevent any access to the
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hardware dlist while a frame described by that list is rendered. On our
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mock driver, we have neither a hardware dlist nor a rendering, so it
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doesn't matter.
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Signed-off-by: Maxime Ripard <maxime@cerno.tech>
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---
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drivers/gpu/drm/vc4/vc4_hvs.c | 12 ++++++++++++
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1 file changed, 12 insertions(+)
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--- a/drivers/gpu/drm/vc4/vc4_hvs.c
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+++ b/drivers/gpu/drm/vc4/vc4_hvs.c
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@@ -490,6 +490,18 @@ void vc4_hvs_mark_dlist_entry_stale(stru
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if (!drm_mm_node_allocated(&alloc->mm_node))
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return;
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+ /*
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+ * Kunit tests run with a mock device and we consider any hardware
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+ * access a test failure. Let's free the dlist allocation right away if
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+ * we're running under kunit, we won't risk a dlist corruption anyway.
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+ */
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+ if (kunit_get_current_test()) {
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+ spin_lock_irqsave(&hvs->mm_lock, flags);
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+ vc4_hvs_free_dlist_entry_locked(hvs, alloc);
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+ spin_unlock_irqrestore(&hvs->mm_lock, flags);
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+ return;
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+ }
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+
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frcnt = vc4_hvs_get_fifo_frame_count(hvs, alloc->channel);
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alloc->target_frame_count = (frcnt + 1) & ((1 << 6) - 1);
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