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From:   Petr Tesarik <petrtesarik@huaweicloud.com>
To:     Jonathan Corbet <corbet@lwn.net>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
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        linux-doc@vger.kernel.org (open list:DOCUMENTATION),
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        dri-devel@lists.freedesktop.org (open list:DRM DRIVERS),
        iommu@lists.linux.dev (open list:DMA MAPPING HELPERS)
Cc:     Roberto Sassu <roberto.sassu@huawei.com>,
        Kefeng Wang <wangkefeng.wang@huawei.com>, petr@tesarici.cz
Subject: [PATCH v2 RESEND 6/7] drm: Use DMA_ATTR_MAY_SLEEP from process context
Date:   Tue,  9 May 2023 11:18:18 +0200
Message-Id: <ec83fcc727c7749924a3e146f1731d93c2b6ba08.1683623618.git.petr.tesarik.ext@huawei.com>
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From: Petr Tesarik <petr.tesarik.ext@huawei.com>

These mappings are never done from atomic context. If a dynamically
allocated bounce buffer is used for the mapping, this change allows
to allocate from CMA.

Signed-off-by: Petr Tesarik <petr.tesarik.ext@huawei.com>
---
 drivers/gpu/drm/drm_gem_shmem_helper.c | 2 +-
 drivers/gpu/drm/drm_prime.c            | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
index 4ea6507a77e5..b32dcefb17a9 100644
--- a/drivers/gpu/drm/drm_gem_shmem_helper.c
+++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
@@ -709,7 +709,7 @@ static struct sg_table *drm_gem_shmem_get_pages_sgt_locked(struct drm_gem_shmem_
 		goto err_put_pages;
 	}
 	/* Map the pages for use by the h/w. */
-	ret = dma_map_sgtable(obj->dev->dev, sgt, DMA_BIDIRECTIONAL, 0);
+	ret = dma_map_sgtable(obj->dev->dev, sgt, DMA_BIDIRECTIONAL, DMA_ATTR_MAY_SLEEP);
 	if (ret)
 		goto err_free_sgt;
 
diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
index d29dafce9bb0..ac28489943b8 100644
--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -639,7 +639,7 @@ struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach,
 		return sgt;
 
 	ret = dma_map_sgtable(attach->dev, sgt, dir,
-			      DMA_ATTR_SKIP_CPU_SYNC);
+			      DMA_ATTR_SKIP_CPU_SYNC | DMA_ATTR_MAY_SLEEP);
 	if (ret) {
 		sg_free_table(sgt);
 		kfree(sgt);
-- 
2.25.1