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From:   John Ogness <john.ogness@linutronix.de>
To:     =?UTF-8?q?Christian=20K=C3=B6nig?= <christian.koenig@amd.com>
Cc:     linux-kernel@vger.kernel.org, Ben Skeggs <bskeggs@redhat.com>,
        Karol Herbst <kherbst@redhat.com>,
        Lyude Paul <lyude@redhat.com>,
        David Airlie <airlied@gmail.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        dri-devel@lists.freedesktop.org, nouveau@lists.freedesktop.org,
        Tanmay Bhushan <007047221b@gmail.com>
Subject: [PATCH v2] drm/nouveau: fix incorrect conversion to dma_resv_wait_timeout()
Date:   Sat, 15 Apr 2023 03:27:37 +0206
Message-Id: <20230415012137.615305-1-john.ogness@linutronix.de>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Commit 41d351f29528 ("drm/nouveau: stop using ttm_bo_wait")
converted from ttm_bo_wait_ctx() to dma_resv_wait_timeout().
However, dma_resv_wait_timeout() returns greater than zero on
success as opposed to ttm_bo_wait_ctx(). As a result, relocs
will fail and log errors even when it was a success.

Change the return code handling to match that of
nouveau_gem_ioctl_cpu_prep(), which was already using
dma_resv_wait_timeout() correctly.

Fixes: 41d351f29528 ("drm/nouveau: stop using ttm_bo_wait")
Reported-by: Tanmay Bhushan <007047221b@gmail.com>
Link: https://lore.kernel.org/lkml/20230119225351.71657-1-007047221b@gmail.com
Signed-off-by: John Ogness <john.ogness@linutronix.de>
---
 The original report was actually a patch that needed fixing.
 Since nobody has stepped up to fix this regression correctly,
 I'm posting the v2.

 This is a real regression introduced in 6.3-rc1.

 drivers/gpu/drm/nouveau/nouveau_gem.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_gem.c b/drivers/gpu/drm/nouveau/nouveau_gem.c
index f77e44958037..346839c24273 100644
--- a/drivers/gpu/drm/nouveau/nouveau_gem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_gem.c
@@ -645,8 +645,9 @@ nouveau_gem_pushbuf_reloc_apply(struct nouveau_cli *cli,
 				struct drm_nouveau_gem_pushbuf_reloc *reloc,
 				struct drm_nouveau_gem_pushbuf_bo *bo)
 {
-	long ret = 0;
+	int ret = 0;
 	unsigned i;
+	long lret;
 
 	for (i = 0; i < req->nr_relocs; i++) {
 		struct drm_nouveau_gem_pushbuf_reloc *r = &reloc[i];
@@ -703,13 +704,18 @@ nouveau_gem_pushbuf_reloc_apply(struct nouveau_cli *cli,
 				data |= r->vor;
 		}
 
-		ret = dma_resv_wait_timeout(nvbo->bo.base.resv,
-					    DMA_RESV_USAGE_BOOKKEEP,
-					    false, 15 * HZ);
-		if (ret == 0)
+		lret = dma_resv_wait_timeout(nvbo->bo.base.resv,
+					     DMA_RESV_USAGE_BOOKKEEP,
+					     false, 15 * HZ);
+		if (!lret)
 			ret = -EBUSY;
+		else if (lret > 0)
+			ret = 0;
+		else
+			ret = lret;
+
 		if (ret) {
-			NV_PRINTK(err, cli, "reloc wait_idle failed: %ld\n",
+			NV_PRINTK(err, cli, "reloc wait_idle failed: %d\n",
 				  ret);
 			break;
 		}

base-commit: 09a9639e56c01c7a00d6c0ca63f4c7c41abe075d
-- 
2.30.2