linux-kernel - [PATCH v2] remoteproc: copy parent dma_pfn

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Message-Id: <20190701070245.32083-1-cleger@kalray.eu>
Date:   Mon,  1 Jul 2019 09:02:45 +0200
From:   Clement Leger <cleger@...ray.eu>
To:     Ohad Ben-Cohen <ohad@...ery.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Loic Pallardy <loic.pallardy@...com>,
        Clement Leger <cleger@...ray.eu>
Subject: [PATCH v2] remoteproc: copy parent dma_pfn_offset for vdev

When preparing the subdevice for the vdev, also copy dma_pfn_offset
since this is used for sub device dma allocations. Without that, there
is incoherency between the parent dma settings and the childs one,
potentially leading to dma_alloc_coherent failure (due to phys_to_dma
using dma_pfn_offset for translation).

Fixes: 086d08725d34 ("remoteproc: create vdev subdevice with specific dma memory pool")
Signed-off-by: Clement Leger <cleger@...ray.eu>
Acked-by: Loic Pallardy <loic.pallardy@...com>
---
Changes in v2:
 - Fix typo in commit message
 - Add "Fixes" in commit message
 - Add Signed-off
 - Add Acked-by Loic Pallardy

---
 drivers/remoteproc/remoteproc_core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 48feebd6d0a2..06837b1f2d60 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -520,6 +520,7 @@ static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc,
 	/* Initialise vdev subdevice */
 	snprintf(name, sizeof(name), "vdev%dbuffer", rvdev->index);
 	rvdev->dev.parent = rproc->dev.parent;
+	rvdev->dev.dma_pfn_offset = rproc->dev.parent->dma_pfn_offset;
 	rvdev->dev.release = rproc_rvdev_release;
 	dev_set_name(&rvdev->dev, "%s#%s", dev_name(rvdev->dev.parent), name);
 	dev_set_drvdata(&rvdev->dev, rvdev);
-- 
2.15.0.276.g89ea799