From 5eb7a80046407f8a9aae81f18333983b25efc161 Mon Sep 17 00:00:00 2001
From: Matthew Auld <matthew.auld@intel.com>
Date: Wed, 27 Jul 2022 17:43:46 +0100
Subject: drm/i915/ttm: don't leak the ccs state
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Alt-commit: 353819d85f87be46aeb9c1dd929d445a006fc6ec
Git-commit: 232d150fa15606e96c0e01e5c7a2d4e03f621787
Patch-mainline: v6.0-rc2
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225 jsc#PED-2849
The kernel only manages the ccs state with lmem-only objects, however
the kernel should still take care not to leak the CCS state from the
previous user.
Fixes: 48760ffe923a ("drm/i915/gt: Clear compress metadata for Flat-ccs objects")
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Cc: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Ramalingam C <ramalingam.c@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220727164346.282407-1-matthew.auld@intel.com
(cherry picked from commit 353819d85f87be46aeb9c1dd929d445a006fc6ec)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/i915/gt/intel_migrate.c | 23 ++++++++++++++++++++++-
1 file changed, 22 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_migrate.c b/drivers/gpu/drm/i915/gt/intel_migrate.c
index 2c35324b5f68..2b10b96b17b5 100644
--- a/drivers/gpu/drm/i915/gt/intel_migrate.c
+++ b/drivers/gpu/drm/i915/gt/intel_migrate.c
@@ -708,7 +708,7 @@ intel_context_migrate_copy(struct intel_context *ce,
u8 src_access, dst_access;
struct i915_request *rq;
int src_sz, dst_sz;
- bool ccs_is_src;
+ bool ccs_is_src, overwrite_ccs;
int err;
GEM_BUG_ON(ce->vm != ce->engine->gt->migrate.context->vm);
@@ -749,6 +749,8 @@ intel_context_migrate_copy(struct intel_context *ce,
get_ccs_sg_sgt(&it_ccs, bytes_to_cpy);
}
+ overwrite_ccs = HAS_FLAT_CCS(i915) && !ccs_bytes_to_cpy && dst_is_lmem;
+
src_offset = 0;
dst_offset = CHUNK_SZ;
if (HAS_64K_PAGES(ce->engine->i915)) {
@@ -852,6 +854,25 @@ intel_context_migrate_copy(struct intel_context *ce,
if (err)
goto out_rq;
ccs_bytes_to_cpy -= ccs_sz;
+ } else if (overwrite_ccs) {
+ err = rq->engine->emit_flush(rq, EMIT_INVALIDATE);
+ if (err)
+ goto out_rq;
+
+ /*
+ * While we can't always restore/manage the CCS state,
+ * we still need to ensure we don't leak the CCS state
+ * from the previous user, so make sure we overwrite it
+ * with something.
+ */
+ err = emit_copy_ccs(rq, dst_offset, INDIRECT_ACCESS,
+ dst_offset, DIRECT_ACCESS, len);
+ if (err)
+ goto out_rq;
+
+ err = rq->engine->emit_flush(rq, EMIT_INVALIDATE);
+ if (err)
+ goto out_rq;
}
/* Arbitration is re-enabled between requests. */
--
2.38.1