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From: Chris Wilson <chris@chris-wilson.co.uk>
To: intel-gfx@lists.freedesktop.org
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Subject: [Intel-gfx] [PATCH] drm/i915/gt: Clear CACHE_MODE prior to clearing residuals
Date: Sun, 17 Jan 2021 09:30:15 +0000
Message-ID: <20210117093015.29143-1-chris@chris-wilson.co.uk> (raw)
In-Reply-To: <20210116223117.12860-1-chris@chris-wilson.co.uk>

Since we do a bare context switch with no restore, the clear residual
kernel runs on dirty state, and we must be careful to avoid executing
bad state from context registers inherited from a malicious client.

Fixes: 008ead6ef8f5 ("drm/i915/gt: Restore clear-residual mitigations for Ivybridge, Baytrail")
Fixes: 09aa9e45863e ("drm/i915/gt: Restore clear-residual mitigations for Ivybridge, Baytrail")
Testcase: igt/gem_ctx_isolation # ivb,vlv
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Akeem G Abodunrin <akeem.g.abodunrin@intel.com>
---
 drivers/gpu/drm/i915/gt/gen7_renderclear.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/gen7_renderclear.c b/drivers/gpu/drm/i915/gt/gen7_renderclear.c
index 56bdcdaa9a88..0490c29788d7 100644
--- a/drivers/gpu/drm/i915/gt/gen7_renderclear.c
+++ b/drivers/gpu/drm/i915/gt/gen7_renderclear.c
@@ -390,6 +390,14 @@ static void emit_batch(struct i915_vma * const vma,
 						     &cb_kernel_ivb,
 						     desc_count);
 
+	gen7_emit_pipeline_invalidate(&cmds);
+	batch_add(&cmds, MI_LOAD_REGISTER_IMM(2));
+	batch_add(&cmds, i915_mmio_reg_offset(CACHE_MODE_0_GEN7));
+	batch_add(&cmds, 0xffff0000);
+	batch_add(&cmds, i915_mmio_reg_offset(CACHE_MODE_1));
+	batch_add(&cmds, 0xffff0000 | PIXEL_SUBSPAN_COLLECT_OPT_DISABLE);
+	gen7_emit_pipeline_flush(&cmds);
+
 	gen7_emit_pipeline_invalidate(&cmds);
 	batch_add(&cmds, PIPELINE_SELECT | PIPELINE_SELECT_MEDIA);
 	batch_add(&cmds, MI_NOOP);
-- 
2.20.1

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  parent reply index

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-16 22:31 Chris Wilson
2021-01-16 23:27 ` [Intel-gfx] ✗ Fi.CI.BAT: failure for " Patchwork
2021-01-17  0:40 ` [Intel-gfx] [PATCH] " Chris Wilson
2021-01-17  1:32 ` [Intel-gfx] ✗ Fi.CI.BAT: failure for drm/i915/gt: Clear CACHE_MODE prior to clearing residuals (rev2) Patchwork
2021-01-17  9:30 ` Chris Wilson [this message]
2021-01-18  5:12   ` [Intel-gfx] [PATCH] drm/i915/gt: Clear CACHE_MODE prior to clearing residuals Abodunrin, Akeem G
2021-01-17 10:38 ` [Intel-gfx] ✓ Fi.CI.BAT: success for drm/i915/gt: Clear CACHE_MODE prior to clearing residuals (rev3) Patchwork
2021-01-17 15:15 ` [Intel-gfx] ✓ Fi.CI.IGT: " Patchwork

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