Re: [PATCH v2 3/5] crypto: hisilicon/sec2 - Add iommu status check

[Xu Zaibo <xuzaibo@huawei.com>]

On 2020/3/3 10:16, Yunsheng Lin wrote:
> On 2020/3/2 19:54, Jonathan Cameron wrote:
>> On Mon, 2 Mar 2020 14:15:14 +0800
>> Zaibo Xu <xuzaibo@huawei.com> wrote:
>>
>>> From: liulongfang <liulongfang@huawei.com>
>>>
>>> In order to improve performance of small packets (<512Bytes)
>>> in SMMU translation scenario,We need to identify the type of IOMMU
> nit: space after ','. and We -> we for lower case?
yes, indeed.

Thanks,
Zaibo

.
>
>>> in the SEC probe to process small packets by a different method.
>>>
>>> Signed-off-by: liulongfang <liulongfang@huawei.com>
>>> Reviewed-by: Zaibo Xu <xuzaibo@huawei.com>
>> This looks like what we ended up with for the SECv1 driver.
>>
>> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
>>> ---
>>>   drivers/crypto/hisilicon/sec2/sec.h      |  1 +
>>>   drivers/crypto/hisilicon/sec2/sec_main.c | 19 +++++++++++++++++++
>>>   2 files changed, 20 insertions(+)
>>>
>>> diff --git a/drivers/crypto/hisilicon/sec2/sec.h b/drivers/crypto/hisilicon/sec2/sec.h
>>> index 13e2d8d..eab0d22 100644
>>> --- a/drivers/crypto/hisilicon/sec2/sec.h
>>> +++ b/drivers/crypto/hisilicon/sec2/sec.h
>>> @@ -165,6 +165,7 @@ struct sec_dev {
>>>   	struct list_head list;
>>>   	struct sec_debug debug;
>>>   	u32 ctx_q_num;
>>> +	bool iommu_used;
>>>   	u32 num_vfs;
>>>   	unsigned long status;
>>>   };
>>> diff --git a/drivers/crypto/hisilicon/sec2/sec_main.c b/drivers/crypto/hisilicon/sec2/sec_main.c
>>> index ebafc1c..6466d90 100644
>>> --- a/drivers/crypto/hisilicon/sec2/sec_main.c
>>> +++ b/drivers/crypto/hisilicon/sec2/sec_main.c
>>> @@ -7,6 +7,7 @@
>>>   #include <linux/debugfs.h>
>>>   #include <linux/init.h>
>>>   #include <linux/io.h>
>>> +#include <linux/iommu.h>
>>>   #include <linux/kernel.h>
>>>   #include <linux/module.h>
>>>   #include <linux/pci.h>
>>> @@ -826,6 +827,23 @@ static void sec_probe_uninit(struct hisi_qm *qm)
>>>   	destroy_workqueue(qm->wq);
>>>   }
>>>   
>>> +static void sec_iommu_used_check(struct sec_dev *sec)
>>> +{
>>> +	struct iommu_domain *domain;
>>> +	struct device *dev = &sec->qm.pdev->dev;
>>> +
>>> +	domain = iommu_get_domain_for_dev(dev);
>>> +
>>> +	/* Check if iommu is used */
>>> +	sec->iommu_used = false;
>>> +	if (domain) {
>>> +		if (domain->type & __IOMMU_DOMAIN_PAGING)
>>> +			sec->iommu_used = true;
>>> +		dev_info(dev, "SMMU Opened, the iommu type = %u\n",
>>> +			domain->type);
>>> +	}
>>> +}
>>> +
>>>   static int sec_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>>>   {
>>>   	struct sec_dev *sec;
>>> @@ -839,6 +857,7 @@ static int sec_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>>>   	pci_set_drvdata(pdev, sec);
>>>   
>>>   	sec->ctx_q_num = ctx_q_num;
>>> +	sec_iommu_used_check(sec);
>>>   
>>>   	qm = &sec->qm;
>>>   
>>
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>> .
>>
> .
>