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Cc:     baolu.lu@linux.intel.com, "Raj, Ashok" <ashok.raj@intel.com>,
        "Kumar, Sanjay K" <sanjay.k.kumar@intel.com>,
        "Pan, Jacob jun" <jacob.jun.pan@intel.com>,
        "Liu, Yi L" <yi.l.liu@intel.com>, "Sun, Yi Y" <yi.y.sun@intel.com>,
        "peterx@redhat.com" <peterx@redhat.com>,
        Jean-Philippe Brucker <jean-philippe.brucker@arm.com>,
        "iommu@lists.linux-foundation.org" <iommu@lists.linux-foundation.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Jacob Pan <jacob.jun.pan@linux.intel.com>
Subject: Re: [PATCH v2 04/12] iommu/vt-d: Add 256-bit invalidation descriptor
 support
To:     "Tian, Kevin" <kevin.tian@intel.com>,
        Joerg Roedel <joro@8bytes.org>,
        David Woodhouse <dwmw2@infradead.org>
References: <20180830013524.28743-1-baolu.lu@linux.intel.com>
 <20180830013524.28743-5-baolu.lu@linux.intel.com>
 <AADFC41AFE54684AB9EE6CBC0274A5D1912F2B3B@SHSMSX101.ccr.corp.intel.com>
From:   Lu Baolu <baolu.lu@linux.intel.com>
Message-ID: <8c87d776-e7d2-7c12-1a13-c8c324530bd2@linux.intel.com>
Date:   Fri, 7 Sep 2018 10:11:06 +0800
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Hi,

On 09/06/2018 10:39 AM, Tian, Kevin wrote:
>> From: Lu Baolu [mailto:baolu.lu@linux.intel.com]
>> Sent: Thursday, August 30, 2018 9:35 AM
>>
>> Intel vt-d spec rev3.0 requires software to use 256-bit
>> descriptors in invalidation queue. As the spec reads in
>> section 6.5.2:
>>
>> Remapping hardware supporting Scalable Mode Translations
>> (ECAP_REG.SMTS=1) allow software to additionally program
>> the width of the descriptors (128-bits or 256-bits) that
>> will be written into the Queue. Software should setup the
>> Invalidation Queue for 256-bit descriptors before progra-
>> mming remapping hardware for scalable-mode translation as
>> 128-bit descriptors are treated as invalid descriptors
>> (see Table 21 in Section 6.5.2.10) in scalable-mode.
>>
>> This patch adds 256-bit invalidation descriptor support
>> if the hardware presents scalable mode capability.
>>
>> Cc: Ashok Raj <ashok.raj@intel.com>
>> Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
>> Cc: Kevin Tian <kevin.tian@intel.com>
>> Cc: Liu Yi L <yi.l.liu@intel.com>
>> Signed-off-by: Sanjay Kumar <sanjay.k.kumar@intel.com>
>> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
>> ---
>>   drivers/iommu/dmar.c                | 83 +++++++++++++++++++----------
>>   drivers/iommu/intel-svm.c           | 76 ++++++++++++++++----------
>>   drivers/iommu/intel_irq_remapping.c |  6 ++-
>>   include/linux/intel-iommu.h         |  7 ++-
>>   4 files changed, 113 insertions(+), 59 deletions(-)
>>
>> diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
>> index d9c748b6f9e4..b1429fa2cf29 100644
>> --- a/drivers/iommu/dmar.c
>> +++ b/drivers/iommu/dmar.c
>> @@ -1160,6 +1160,7 @@ static int qi_check_fault(struct intel_iommu
>> *iommu, int index)
>>   	int head, tail;
>>   	struct q_inval *qi = iommu->qi;
>>   	int wait_index = (index + 1) % QI_LENGTH;
>> +	int shift = DMAR_IQ_SHIFT + !!ecap_smts(iommu->ecap);
> 
> could add a new macro: qi_shift()

Fair enough.

> 
>>
>>   	if (qi->desc_status[wait_index] == QI_ABORT)
>>   		return -EAGAIN;
>> @@ -1173,13 +1174,15 @@ static int qi_check_fault(struct intel_iommu
>> *iommu, int index)
>>   	 */
>>   	if (fault & DMA_FSTS_IQE) {
>>   		head = readl(iommu->reg + DMAR_IQH_REG);
>> -		if ((head >> DMAR_IQ_SHIFT) == index) {
>> +		if ((head >> shift) == index) {
> 
> could be another macro: qi_index(head)

Fair enough.

> 
>> +			struct qi_desc *desc = qi->desc + head;
>> +
>>   			pr_err("VT-d detected invalid descriptor: "
>>   				"low=%llx, high=%llx\n",
>> -				(unsigned long long)qi->desc[index].low,
>> -				(unsigned long long)qi->desc[index].high);
>> -			memcpy(&qi->desc[index], &qi->desc[wait_index],
>> -					sizeof(struct qi_desc));
>> +				(unsigned long long)desc->qw0,
>> +				(unsigned long long)desc->qw1);
> 
> what about qw2 and qw3 in 256-bit case?

Should print qw2 and qw3 as well.

> 
>> +			memcpy(desc, qi->desc + (wait_index << shift),
>> +			       1 << shift);
>>   			writel(DMA_FSTS_IQE, iommu->reg +
>> DMAR_FSTS_REG);
>>   			return -EINVAL;
>>   		}
>> @@ -1191,10 +1194,10 @@ static int qi_check_fault(struct intel_iommu
>> *iommu, int index)
>>   	 */
>>   	if (fault & DMA_FSTS_ITE) {
>>   		head = readl(iommu->reg + DMAR_IQH_REG);
>> -		head = ((head >> DMAR_IQ_SHIFT) - 1 + QI_LENGTH) %
>> QI_LENGTH;
>> +		head = ((head >> shift) - 1 + QI_LENGTH) % QI_LENGTH;
>>   		head |= 1;
>>   		tail = readl(iommu->reg + DMAR_IQT_REG);
>> -		tail = ((tail >> DMAR_IQ_SHIFT) - 1 + QI_LENGTH) %
>> QI_LENGTH;
>> +		tail = ((tail >> shift) - 1 + QI_LENGTH) % QI_LENGTH;
>>
>>   		writel(DMA_FSTS_ITE, iommu->reg + DMAR_FSTS_REG);
>>
>> @@ -1222,15 +1225,14 @@ int qi_submit_sync(struct qi_desc *desc, struct
>> intel_iommu *iommu)
>>   {
>>   	int rc;
>>   	struct q_inval *qi = iommu->qi;
>> -	struct qi_desc *hw, wait_desc;
>> +	int offset, shift, length;
>> +	struct qi_desc wait_desc;
>>   	int wait_index, index;
>>   	unsigned long flags;
>>
>>   	if (!qi)
>>   		return 0;
>>
>> -	hw = qi->desc;
>> -
>>   restart:
>>   	rc = 0;
>>
>> @@ -1243,16 +1245,21 @@ int qi_submit_sync(struct qi_desc *desc, struct
>> intel_iommu *iommu)
>>
>>   	index = qi->free_head;
>>   	wait_index = (index + 1) % QI_LENGTH;
>> +	shift = DMAR_IQ_SHIFT + !!ecap_smts(iommu->ecap);
>> +	length = 1 << shift;
>>
>>   	qi->desc_status[index] = qi->desc_status[wait_index] = QI_IN_USE;
>>
>> -	hw[index] = *desc;
>> -
>> -	wait_desc.low = QI_IWD_STATUS_DATA(QI_DONE) |
>> +	offset = index << shift;
>> +	memcpy(qi->desc + offset, desc, length);
>> +	wait_desc.qw0 = QI_IWD_STATUS_DATA(QI_DONE) |
>>   			QI_IWD_STATUS_WRITE | QI_IWD_TYPE;
>> -	wait_desc.high = virt_to_phys(&qi->desc_status[wait_index]);
>> +	wait_desc.qw1 = virt_to_phys(&qi->desc_status[wait_index]);
>> +	wait_desc.qw2 = 0;
>> +	wait_desc.qw3 = 0;
>>
>> -	hw[wait_index] = wait_desc;
>> +	offset = wait_index << shift;
>> +	memcpy(qi->desc + offset, &wait_desc, length);
>>
>>   	qi->free_head = (qi->free_head + 2) % QI_LENGTH;
>>   	qi->free_cnt -= 2;
>> @@ -1261,7 +1268,7 @@ int qi_submit_sync(struct qi_desc *desc, struct
>> intel_iommu *iommu)
>>   	 * update the HW tail register indicating the presence of
>>   	 * new descriptors.
>>   	 */
>> -	writel(qi->free_head << DMAR_IQ_SHIFT, iommu->reg +
>> DMAR_IQT_REG);
>> +	writel(qi->free_head << shift, iommu->reg + DMAR_IQT_REG);
>>
>>   	while (qi->desc_status[wait_index] != QI_DONE) {
>>   		/*
>> @@ -1298,8 +1305,10 @@ void qi_global_iec(struct intel_iommu *iommu)
>>   {
>>   	struct qi_desc desc;
>>
>> -	desc.low = QI_IEC_TYPE;
>> -	desc.high = 0;
>> +	desc.qw0 = QI_IEC_TYPE;
>> +	desc.qw1 = 0;
>> +	desc.qw2 = 0;
>> +	desc.qw3 = 0;
>>
>>   	/* should never fail */
>>   	qi_submit_sync(&desc, iommu);
>> @@ -1310,9 +1319,11 @@ void qi_flush_context(struct intel_iommu
>> *iommu, u16 did, u16 sid, u8 fm,
>>   {
>>   	struct qi_desc desc;
>>
>> -	desc.low = QI_CC_FM(fm) | QI_CC_SID(sid) | QI_CC_DID(did)
>> +	desc.qw0 = QI_CC_FM(fm) | QI_CC_SID(sid) | QI_CC_DID(did)
>>   			| QI_CC_GRAN(type) | QI_CC_TYPE;
>> -	desc.high = 0;
>> +	desc.qw1 = 0;
>> +	desc.qw2 = 0;
>> +	desc.qw3 = 0;
>>
>>   	qi_submit_sync(&desc, iommu);
>>   }
>> @@ -1331,10 +1342,12 @@ void qi_flush_iotlb(struct intel_iommu
>> *iommu, u16 did, u64 addr,
>>   	if (cap_read_drain(iommu->cap))
>>   		dr = 1;
>>
>> -	desc.low = QI_IOTLB_DID(did) | QI_IOTLB_DR(dr) |
>> QI_IOTLB_DW(dw)
>> +	desc.qw0 = QI_IOTLB_DID(did) | QI_IOTLB_DR(dr) |
>> QI_IOTLB_DW(dw)
>>   		| QI_IOTLB_GRAN(type) | QI_IOTLB_TYPE;
>> -	desc.high = QI_IOTLB_ADDR(addr) | QI_IOTLB_IH(ih)
>> +	desc.qw1 = QI_IOTLB_ADDR(addr) | QI_IOTLB_IH(ih)
>>   		| QI_IOTLB_AM(size_order);
>> +	desc.qw2 = 0;
>> +	desc.qw3 = 0;
>>
>>   	qi_submit_sync(&desc, iommu);
>>   }
>> @@ -1347,15 +1360,17 @@ void qi_flush_dev_iotlb(struct intel_iommu
>> *iommu, u16 sid, u16 pfsid,
>>   	if (mask) {
>>   		WARN_ON_ONCE(addr & ((1ULL << (VTD_PAGE_SHIFT +
>> mask)) - 1));
>>   		addr |= (1ULL << (VTD_PAGE_SHIFT + mask - 1)) - 1;
>> -		desc.high = QI_DEV_IOTLB_ADDR(addr) |
>> QI_DEV_IOTLB_SIZE;
>> +		desc.qw1 = QI_DEV_IOTLB_ADDR(addr) |
>> QI_DEV_IOTLB_SIZE;
>>   	} else
>> -		desc.high = QI_DEV_IOTLB_ADDR(addr);
>> +		desc.qw1 = QI_DEV_IOTLB_ADDR(addr);
>>
>>   	if (qdep >= QI_DEV_IOTLB_MAX_INVS)
>>   		qdep = 0;
>>
>> -	desc.low = QI_DEV_IOTLB_SID(sid) | QI_DEV_IOTLB_QDEP(qdep) |
>> +	desc.qw0 = QI_DEV_IOTLB_SID(sid) | QI_DEV_IOTLB_QDEP(qdep) |
>>   		   QI_DIOTLB_TYPE | QI_DEV_IOTLB_PFSID(pfsid);
>> +	desc.qw2 = 0;
>> +	desc.qw3 = 0;
>>
>>   	qi_submit_sync(&desc, iommu);
>>   }
>> @@ -1403,16 +1418,24 @@ static void __dmar_enable_qi(struct
>> intel_iommu *iommu)
>>   	u32 sts;
>>   	unsigned long flags;
>>   	struct q_inval *qi = iommu->qi;
>> +	u64 val = virt_to_phys(qi->desc);
>>
>>   	qi->free_head = qi->free_tail = 0;
>>   	qi->free_cnt = QI_LENGTH;
>>
>> +	/*
>> +	 * Set DW=1 and QS=1 in IQA_REG when Scalable Mode capability
>> +	 * is present.
>> +	 */
>> +	if (ecap_smts(iommu->ecap))
>> +		val |= (1 << 11) | 1;
>> +
>>   	raw_spin_lock_irqsave(&iommu->register_lock, flags);
>>
>>   	/* write zero to the tail reg */
>>   	writel(0, iommu->reg + DMAR_IQT_REG);
>>
>> -	dmar_writeq(iommu->reg + DMAR_IQA_REG, virt_to_phys(qi-
>>> desc));
>> +	dmar_writeq(iommu->reg + DMAR_IQA_REG, val);
>>
>>   	iommu->gcmd |= DMA_GCMD_QIE;
>>   	writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG);
>> @@ -1448,8 +1471,12 @@ int dmar_enable_qi(struct intel_iommu
>> *iommu)
>>
>>   	qi = iommu->qi;
>>
>> -
>> -	desc_page = alloc_pages_node(iommu->node, GFP_ATOMIC |
>> __GFP_ZERO, 0);
>> +	/*
>> +	 * Need two pages to accommodate 256 descriptors of 256 bits each
>> +	 * if the remapping hardware supports scalable mode translation.
>> +	 */
>> +	desc_page = alloc_pages_node(iommu->node, GFP_ATOMIC |
>> __GFP_ZERO,
>> +				     !!ecap_smts(iommu->ecap));
>>   	if (!desc_page) {
>>   		kfree(qi);
>>   		iommu->qi = NULL;
>> diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
>> index 6c0bd9ee9602..a06ed098e928 100644
>> --- a/drivers/iommu/intel-svm.c
>> +++ b/drivers/iommu/intel-svm.c
>> @@ -161,27 +161,40 @@ static void intel_flush_svm_range_dev (struct
>> intel_svm *svm, struct intel_svm_d
>>   		 * because that's the only option the hardware gives us.
>> Despite
>>   		 * the fact that they are actually only accessible through one.
>> */
>>   		if (gl)
>> -			desc.low = QI_EIOTLB_PASID(svm->pasid) |
>> QI_EIOTLB_DID(sdev->did) |
>> -				QI_EIOTLB_GRAN(QI_GRAN_ALL_ALL) |
>> QI_EIOTLB_TYPE;
>> +			desc.qw0 = QI_EIOTLB_PASID(svm->pasid) |
>> +					QI_EIOTLB_DID(sdev->did) |
>> +
>> 	QI_EIOTLB_GRAN(QI_GRAN_ALL_ALL) |
>> +					QI_EIOTLB_TYPE;
>>   		else
>> -			desc.low = QI_EIOTLB_PASID(svm->pasid) |
>> QI_EIOTLB_DID(sdev->did) |
>> -				QI_EIOTLB_GRAN(QI_GRAN_NONG_PASID)
>> | QI_EIOTLB_TYPE;
>> -		desc.high = 0;
>> +			desc.qw0 = QI_EIOTLB_PASID(svm->pasid) |
>> +					QI_EIOTLB_DID(sdev->did) |
>> +
>> 	QI_EIOTLB_GRAN(QI_GRAN_NONG_PASID) |
>> +					QI_EIOTLB_TYPE;
>> +		desc.qw1 = 0;
>>   	} else {
>>   		int mask = ilog2(__roundup_pow_of_two(pages));
>>
>> -		desc.low = QI_EIOTLB_PASID(svm->pasid) |
>> QI_EIOTLB_DID(sdev->did) |
>> -			QI_EIOTLB_GRAN(QI_GRAN_PSI_PASID) |
>> QI_EIOTLB_TYPE;
>> -		desc.high = QI_EIOTLB_ADDR(address) | QI_EIOTLB_GL(gl) |
>> -			QI_EIOTLB_IH(ih) | QI_EIOTLB_AM(mask);
>> +		desc.qw0 = QI_EIOTLB_PASID(svm->pasid) |
>> +				QI_EIOTLB_DID(sdev->did) |
>> +				QI_EIOTLB_GRAN(QI_GRAN_PSI_PASID) |
>> +				QI_EIOTLB_TYPE;
>> +		desc.qw1 = QI_EIOTLB_ADDR(address) |
>> +				QI_EIOTLB_GL(gl) |
>> +				QI_EIOTLB_IH(ih) |
>> +				QI_EIOTLB_AM(mask);
>>   	}
>> +	desc.qw2 = 0;
>> +	desc.qw3 = 0;
>>   	qi_submit_sync(&desc, svm->iommu);
>>
>>   	if (sdev->dev_iotlb) {
>> -		desc.low = QI_DEV_EIOTLB_PASID(svm->pasid) |
>> QI_DEV_EIOTLB_SID(sdev->sid) |
>> -			QI_DEV_EIOTLB_QDEP(sdev->qdep) |
>> QI_DEIOTLB_TYPE;
>> +		desc.qw0 = QI_DEV_EIOTLB_PASID(svm->pasid) |
>> +				QI_DEV_EIOTLB_SID(sdev->sid) |
>> +				QI_DEV_EIOTLB_QDEP(sdev->qdep) |
>> +				QI_DEIOTLB_TYPE;
>>   		if (pages == -1) {
>> -			desc.high = QI_DEV_EIOTLB_ADDR(-1ULL >> 1) |
>> QI_DEV_EIOTLB_SIZE;
>> +			desc.qw1 = QI_DEV_EIOTLB_ADDR(-1ULL >> 1) |
>> +					QI_DEV_EIOTLB_SIZE;
>>   		} else if (pages > 1) {
>>   			/* The least significant zero bit indicates the size. So,
>>   			 * for example, an "address" value of 0x12345f000
>> will
>> @@ -189,10 +202,13 @@ static void intel_flush_svm_range_dev (struct
>> intel_svm *svm, struct intel_svm_d
>>   			unsigned long last = address + ((unsigned
>> long)(pages - 1) << VTD_PAGE_SHIFT);
>>   			unsigned long mask =
>> __rounddown_pow_of_two(address ^ last);
>>
>> -			desc.high = QI_DEV_EIOTLB_ADDR((address &
>> ~mask) | (mask - 1)) | QI_DEV_EIOTLB_SIZE;
>> +			desc.qw1 = QI_DEV_EIOTLB_ADDR((address &
>> ~mask) |
>> +					(mask - 1)) | QI_DEV_EIOTLB_SIZE;
>>   		} else {
>> -			desc.high = QI_DEV_EIOTLB_ADDR(address);
>> +			desc.qw1 = QI_DEV_EIOTLB_ADDR(address);
>>   		}
>> +		desc.qw2 = 0;
>> +		desc.qw3 = 0;
>>   		qi_submit_sync(&desc, svm->iommu);
>>   	}
>>   }
>> @@ -237,8 +253,11 @@ static void intel_flush_pasid_dev(struct intel_svm
>> *svm, struct intel_svm_dev *s
>>   {
>>   	struct qi_desc desc;
>>
>> -	desc.high = 0;
>> -	desc.low = QI_PC_TYPE | QI_PC_DID(sdev->did) | QI_PC_PASID_SEL
>> | QI_PC_PASID(pasid);
>> +	desc.qw0 = QI_PC_TYPE | QI_PC_DID(sdev->did) |
>> +			QI_PC_PASID_SEL | QI_PC_PASID(pasid);
>> +	desc.qw1 = 0;
>> +	desc.qw2 = 0;
>> +	desc.qw3 = 0;
>>
>>   	qi_submit_sync(&desc, svm->iommu);
>>   }
>> @@ -668,24 +687,27 @@ static irqreturn_t prq_event_thread(int irq, void
>> *d)
>>   	no_pasid:
>>   		if (req->lpig) {
>>   			/* Page Group Response */
>> -			resp.low = QI_PGRP_PASID(req->pasid) |
>> +			resp.qw0 = QI_PGRP_PASID(req->pasid) |
>>   				QI_PGRP_DID((req->bus << 8) | req->devfn)
>> |
>>   				QI_PGRP_PASID_P(req->pasid_present) |
>>   				QI_PGRP_RESP_TYPE;
>> -			resp.high = QI_PGRP_IDX(req->prg_index) |
>> -				QI_PGRP_PRIV(req->private) |
>> QI_PGRP_RESP_CODE(result);
>> -
>> -			qi_submit_sync(&resp, iommu);
>> +			resp.qw1 = QI_PGRP_IDX(req->prg_index) |
>> +				QI_PGRP_PRIV(req->private) |
>> +				QI_PGRP_RESP_CODE(result);
>>   		} else if (req->srr) {
>>   			/* Page Stream Response */
>> -			resp.low = QI_PSTRM_IDX(req->prg_index) |
>> -				QI_PSTRM_PRIV(req->private) |
>> QI_PSTRM_BUS(req->bus) |
>> -				QI_PSTRM_PASID(req->pasid) |
>> QI_PSTRM_RESP_TYPE;
>> -			resp.high = QI_PSTRM_ADDR(address) |
>> QI_PSTRM_DEVFN(req->devfn) |
>> +			resp.qw0 = QI_PSTRM_IDX(req->prg_index) |
>> +				QI_PSTRM_PRIV(req->private) |
>> +				QI_PSTRM_BUS(req->bus) |
>> +				QI_PSTRM_PASID(req->pasid) |
>> +				QI_PSTRM_RESP_TYPE;
>> +			resp.qw1 = QI_PSTRM_ADDR(address) |
>> +				QI_PSTRM_DEVFN(req->devfn) |
>>   				QI_PSTRM_RESP_CODE(result);
>> -
>> -			qi_submit_sync(&resp, iommu);
>>   		}
>> +		resp.qw2 = 0;
>> +		resp.qw3 = 0;
>> +		qi_submit_sync(&resp, iommu);
>>
>>   		head = (head + sizeof(*req)) & PRQ_RING_MASK;
>>   	}
>> diff --git a/drivers/iommu/intel_irq_remapping.c
>> b/drivers/iommu/intel_irq_remapping.c
>> index 967450bd421a..916391f33ca6 100644
>> --- a/drivers/iommu/intel_irq_remapping.c
>> +++ b/drivers/iommu/intel_irq_remapping.c
>> @@ -145,9 +145,11 @@ static int qi_flush_iec(struct intel_iommu *iommu,
>> int index, int mask)
>>   {
>>   	struct qi_desc desc;
>>
>> -	desc.low = QI_IEC_IIDEX(index) | QI_IEC_TYPE | QI_IEC_IM(mask)
>> +	desc.qw0 = QI_IEC_IIDEX(index) | QI_IEC_TYPE | QI_IEC_IM(mask)
>>   		   | QI_IEC_SELECTIVE;
>> -	desc.high = 0;
>> +	desc.qw1 = 0;
>> +	desc.qw2 = 0;
>> +	desc.qw3 = 0;
>>
>>   	return qi_submit_sync(&desc, iommu);
>>   }
>> diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
>> index 41791903a5e3..72aff482b293 100644
>> --- a/include/linux/intel-iommu.h
>> +++ b/include/linux/intel-iommu.h
>> @@ -340,12 +340,15 @@ enum {
>>   #define QI_GRAN_PSI_PASID		3
>>
>>   struct qi_desc {
>> -	u64 low, high;
>> +	u64 qw0;
>> +	u64 qw1;
>> +	u64 qw2;
>> +	u64 qw3;
>>   };
>>
>>   struct q_inval {
>>   	raw_spinlock_t  q_lock;
>> -	struct qi_desc  *desc;          /* invalidation queue */
>> +	void		*desc;          /* invalidation queue */
>>   	int             *desc_status;   /* desc status */
>>   	int             free_head;      /* first free entry */
>>   	int             free_tail;      /* last free entry */
>> --
>> 2.17.1
> 
> 

Best regards,
Lu Baolu