linux-kernel - [PATCH 5.19 027/365] drm/i915: pass a pointer for tlb seqno at vma_invalidate

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Message-Id: <20220823080119.367414148@linuxfoundation.org>
Date:   Tue, 23 Aug 2022 09:58:48 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Mauro Carvalho Chehab <mchehab@...nel.org>,
        Andi Shyti <andi.shyti@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>
Subject: [PATCH 5.19 027/365] drm/i915: pass a pointer for tlb seqno at vma_invalidate_tlb()

From: Mauro Carvalho Chehab <mchehab@...nel.org>

commit 9d50bff40e3e366886ec37299fc317edf84be0c9 upstream.

WRITE_ONCE() should happen at the original var, not on a local
copy of it.

Cc: stable@...r.kernel.org
Fixes: 59eda6ce824e ("drm/i915/gt: Batch TLB invalidations")
Signed-off-by: Mauro Carvalho Chehab <mchehab@...nel.org>
Reviewed-by: Andi Shyti <andi.shyti@...ux.intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@...el.com>
[added cc-stable while merging it]
Link: https://patchwork.freedesktop.org/patch/msgid/f9550e6bacea10131ff40dd8981b69eb9251cdcd.1659598090.git.mchehab@kernel.org
(cherry picked from commit 3d037d99e61a1e7a3ae3d214146d88db349dd19f)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/i915/gt/intel_ppgtt.c |    2 +-
 drivers/gpu/drm/i915/i915_vma.c       |    6 +++---
 drivers/gpu/drm/i915/i915_vma.h       |    2 +-
 3 files changed, 5 insertions(+), 5 deletions(-)

--- a/drivers/gpu/drm/i915/gt/intel_ppgtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_ppgtt.c
@@ -211,7 +211,7 @@ void ppgtt_unbind_vma(struct i915_addres
 
 	vm->clear_range(vm, vma_res->start, vma_res->vma_size);
 	if (vma_res->tlb)
-		vma_invalidate_tlb(vm, *vma_res->tlb);
+		vma_invalidate_tlb(vm, vma_res->tlb);
 }
 
 static unsigned long pd_count(u64 size, int shift)
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -1299,7 +1299,7 @@ err_unpin:
 	return err;
 }
 
-void vma_invalidate_tlb(struct i915_address_space *vm, u32 tlb)
+void vma_invalidate_tlb(struct i915_address_space *vm, u32 *tlb)
 {
 	/*
 	 * Before we release the pages that were bound by this vma, we
@@ -1309,7 +1309,7 @@ void vma_invalidate_tlb(struct i915_addr
 	 * the most recent TLB invalidation seqno, and if we have not yet
 	 * flushed the TLBs upon release, perform a full invalidation.
 	 */
-	WRITE_ONCE(tlb, intel_gt_next_invalidate_tlb_full(vm->gt));
+	WRITE_ONCE(*tlb, intel_gt_next_invalidate_tlb_full(vm->gt));
 }
 
 static void __vma_put_pages(struct i915_vma *vma, unsigned int count)
@@ -1957,7 +1957,7 @@ struct dma_fence *__i915_vma_evict(struc
 			dma_fence_put(unbind_fence);
 			unbind_fence = NULL;
 		}
-		vma_invalidate_tlb(vma->vm, vma->obj->mm.tlb);
+		vma_invalidate_tlb(vma->vm, &vma->obj->mm.tlb);
 	}
 
 	/*
--- a/drivers/gpu/drm/i915/i915_vma.h
+++ b/drivers/gpu/drm/i915/i915_vma.h
@@ -213,7 +213,7 @@ bool i915_vma_misplaced(const struct i91
 			u64 size, u64 alignment, u64 flags);
 void __i915_vma_set_map_and_fenceable(struct i915_vma *vma);
 void i915_vma_revoke_mmap(struct i915_vma *vma);
-void vma_invalidate_tlb(struct i915_address_space *vm, u32 tlb);
+void vma_invalidate_tlb(struct i915_address_space *vm, u32 *tlb);
 struct dma_fence *__i915_vma_evict(struct i915_vma *vma, bool async);
 int __i915_vma_unbind(struct i915_vma *vma);
 int __must_check i915_vma_unbind(struct i915_vma *vma);