From: Christoph Hellwig <hch@infradead.org>
To: Sherry Sun <sherry.sun@nxp.com>
Cc: hch@infradead.org, sudeep.dutt@intel.com,
ashutosh.dixit@intel.com, arnd@arndb.de,
gregkh@linuxfoundation.org, kishon@ti.com,
lorenzo.pieralisi@arm.com, linux-kernel@vger.kernel.org,
linux-pci@vger.kernel.org, linux-imx@nxp.com
Subject: Re: [PATCH V3 1/4] misc: vop: change the way of allocating vring and device page
Date: Fri, 23 Oct 2020 10:25:24 +0100 [thread overview]
Message-ID: <20201023092524.GA29066@infradead.org> (raw)
In-Reply-To: <20201022050638.29641-2-sherry.sun@nxp.com>
> static int mic_dp_init(struct mic_device *mdev)
> {
> - mdev->dp = kzalloc(MIC_DP_SIZE, GFP_KERNEL);
> + mdev->dp = dma_alloc_coherent(&mdev->pdev->dev, MIC_DP_SIZE,
> + &mdev->dp_dma_addr, GFP_KERNEL);
> if (!mdev->dp)
> return -ENOMEM;
>
> - mdev->dp_dma_addr = mic_map_single(mdev,
> - mdev->dp, MIC_DP_SIZE);
> - if (mic_map_error(mdev->dp_dma_addr)) {
> - kfree(mdev->dp);
> - dev_err(&mdev->pdev->dev, "%s %d err %d\n",
> - __func__, __LINE__, -ENOMEM);
> - return -ENOMEM;
> - }
> mdev->ops->write_spad(mdev, MIC_DPLO_SPAD, mdev->dp_dma_addr);
> mdev->ops->write_spad(mdev, MIC_DPHI_SPAD, mdev->dp_dma_addr >> 32);
> return 0;
> @@ -68,8 +62,7 @@ static int mic_dp_init(struct mic_device *mdev)
> /* Uninitialize the device page */
> static void mic_dp_uninit(struct mic_device *mdev)
> {
> - mic_unmap_single(mdev, mdev->dp_dma_addr, MIC_DP_SIZE);
> - kfree(mdev->dp);
> + dma_free_coherent(&mdev->pdev->dev, MIC_DP_SIZE, mdev->dp, mdev->dp_dma_addr);
> }
This adds an over 80 char line. Also please just kill mic_dp_init and
mic_dp_uninit and inline those into the callers.
> + vvr->buf = dma_alloc_coherent(vop_dev(vdev), VOP_INT_DMA_BUF_SIZE,
> + &vvr->buf_da, GFP_KERNEL);
Another overly long line.
> @@ -1068,7 +1049,7 @@ vop_query_offset(struct vop_vdev *vdev, unsigned long offset,
> struct vop_vringh *vvr = &vdev->vvr[i];
>
> if (offset == start) {
> - *pa = virt_to_phys(vvr->vring.va);
> + *pa = vqconfig[i].address;
vqconfig[i].address is a __le64, so this needs an endian swap.
But more importantly the caller of vop_query_offset, vop_mmap, uses
remap_pfn_range and pa. You cannot mix remap_pfn_range with DMA
coherent allocations, it can only be mmaped using dma_mmap_coherent.
next prev parent reply other threads:[~2020-10-23 9:25 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-22 5:06 [PATCH V3 0/4] Change vring space from nomal memory to dma coherent memory Sherry Sun
2020-10-22 5:06 ` [PATCH V3 1/4] misc: vop: change the way of allocating vring and device page Sherry Sun
2020-10-22 7:58 ` kernel test robot
2020-10-23 9:25 ` Christoph Hellwig [this message]
2020-10-26 2:54 ` Sherry Sun
2020-10-22 5:06 ` [PATCH V3 2/4] misc: vop: do not allocate and reassign the used ring Sherry Sun
2020-10-22 8:53 ` kernel test robot
2020-10-23 9:26 ` Christoph Hellwig
2020-10-26 3:04 ` Sherry Sun
2020-10-27 6:28 ` gregkh
2020-10-22 5:06 ` [PATCH V3 3/4] misc: vop: simply return the saved dma address instead of virt_to_phys Sherry Sun
2020-10-22 5:06 ` [PATCH V3 4/4] misc: vop: mapping kernel memory to user space as noncached Sherry Sun
2020-10-23 9:28 ` Christoph Hellwig
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