linux-kernel - Re: [PATCH v2 6/7] misc: bcm-vk: add Broadcom VK driver

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Message-ID: <c781505e-5bbd-a259-4c2d-4481db3fabde@broadcom.com>
Date:   Sat, 18 Apr 2020 10:25:58 -0700
From:   Scott Branden <scott.branden@...adcom.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Luis Chamberlain <mcgrof@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        David Brown <david.brown@...aro.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Shuah Khan <shuah@...nel.org>, bjorn.andersson@...aro.org,
        Shuah Khan <skhan@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-fsdevel@...r.kernel.org,
        BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
        Olof Johansson <olof@...om.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Colin Ian King <colin.king@...onical.com>,
        Kees Cook <keescook@...omium.org>,
        Takashi Iwai <tiwai@...e.de>, linux-kselftest@...r.kernel.org,
        Andy Gross <agross@...nel.org>,
        Desmond Yan <desmond.yan@...adcom.com>,
        James Hu <james.hu@...adcom.com>
Subject: Re: [PATCH v2 6/7] misc: bcm-vk: add Broadcom VK driver

Thanks Dan, I'll send out new version as soon as my other patch (you had 
requested for test_fx mutex cleanups)
https://lore.kernel.org/linux-arm-msm/20200415002517.4328-1-scott.branden@broadcom.com/

hits the linux-next tree so this patch series will apply cleanly to 
linux-next.




On 2020-04-18 4:47 a.m., Dan Carpenter wrote:
> On Sat, Apr 18, 2020 at 02:45:16PM +0300, Dan Carpenter wrote:
>> On Fri, Apr 17, 2020 at 02:49:11PM -0700, Scott Branden wrote:
>>>>> +static int bcm_vk_dma_alloc(struct device *dev,
>>>>> +			    struct bcm_vk_dma *dma,
>>>>> +			    int direction,
>>>>> +			    struct _vk_data *vkdata)
>>>>> +{
>>>>> +	dma_addr_t addr, sg_addr;
>>>>> +	int err;
>>>>> +	int i;
>>>>> +	int offset;
>>>>> +	uint32_t size;
>>>>> +	uint32_t remaining_size;
>>>>> +	uint32_t transfer_size;
>>>>> +	uint64_t data;
>>>>> +	unsigned long first, last;
>>>>> +	struct _vk_data *sgdata;
>>>>> +
>>>>> +	/* Get 64-bit user address */
>>>>> +	data = get_unaligned(&(vkdata->address));
>>>> Extra parens.
>>> removed
>>>>> +
>>>>> +	/* offset into first page */
>>>>> +	offset = offset_in_page(data);
>>>>> +
>>>>> +	/* Calculate number of pages */
>>>>> +	first = (data & PAGE_MASK) >> PAGE_SHIFT;
>>>>> +	last  = ((data + vkdata->size - 1) & PAGE_MASK) >> PAGE_SHIFT;
>>>>> +	dma->nr_pages = last - first + 1;
>>>>> +
>>>>> +	/* Allocate DMA pages */
>>>>> +	dma->pages = kmalloc_array(dma->nr_pages,
>>>>> +				   sizeof(struct page *),
>>>>> +				   GFP_KERNEL);
>>>>> +	if (dma->pages == NULL)
>>>>> +		return -ENOMEM;
>>>>> +
>>>>> +	dev_dbg(dev, "Alloc DMA Pages [0x%llx+0x%x => %d pages]\n",
>>>>> +		data, vkdata->size, dma->nr_pages);
>>>>> +
>>>>> +	dma->direction = direction;
>>>>> +
>>>>> +	/* Get user pages into memory */
>>>>> +	err = get_user_pages_fast(data & PAGE_MASK,
>>>>> +				  dma->nr_pages,
>>>>> +				  direction == DMA_FROM_DEVICE,
>>>>> +				  dma->pages);
>>>>> +	if (err != dma->nr_pages) {
>>>>> +		dma->nr_pages = (err >= 0) ? err : 0;
>>>>> +		dev_err(dev, "get_user_pages_fast, err=%d [%d]\n",
>>>>> +			err, dma->nr_pages);
>>>>> +		return err < 0 ? err : -EINVAL;
>>>>> +	}
>>>>> +
>>>>> +	/* Max size of sg list is 1 per mapped page + fields at start */
>>>>> +	dma->sglen = (dma->nr_pages * sizeof(*sgdata)) +
>>>>> +		     (sizeof(uint32_t) * SGLIST_VKDATA_START);
>>>>> +
>>>>> +	/* Allocate sglist */
>>>>> +	dma->sglist = dma_alloc_coherent(dev,
>>>>> +					 dma->sglen,
>>>>> +					 &dma->handle,
>>>>> +					 GFP_KERNEL);
>>>> 	dma->sglist = dma_alloc_coherent(dev, dma->sglen, &dma->handle,
>>>> 					 GFP_KERNEL);
>>> done
>>>>
>>>>> +	if (!dma->sglist)
>>>>> +		return -ENOMEM;
>>>> No cleanup?
>>> what needs to be cleaned up?
>> dma->pages should be freed probably?  And a put_user_pages_fast()?
> Sorry put_user_pages_fast() isn't a function.  My bad.
>
> regards,
> dan carpenter