From: Robin Murphy <robin.murphy@arm.com>
To: Auger Eric <eric.auger@redhat.com>,
eric.auger.pro@gmail.com, iommu@lists.linux-foundation.org,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
kvmarm@lists.cs.columbia.edu, joro@8bytes.org,
alex.williamson@redhat.com, jacob.jun.pan@linux.intel.com,
yi.l.liu@intel.com, jean-philippe.brucker@arm.com,
will.deacon@arm.com
Cc: kevin.tian@intel.com, vincent.stehle@arm.com,
ashok.raj@intel.com, marc.zyngier@arm.com
Subject: Re: [PATCH v7 14/23] iommu/smmuv3: Implement cache_invalidate
Date: Mon, 13 May 2019 15:01:01 +0100 [thread overview]
Message-ID: <a181689b-94b5-5ff6-9fec-66b3f319cbc4@arm.com> (raw)
In-Reply-To: <edff2a6f-66e6-6d7e-49ca-3065e93a41a4@redhat.com>
On 13/05/2019 13:16, Auger Eric wrote:
> Hi Robin,
> On 5/8/19 5:01 PM, Robin Murphy wrote:
>> On 08/04/2019 13:19, Eric Auger wrote:
>>> Implement domain-selective and page-selective IOTLB invalidations.
>>>
>>> Signed-off-by: Eric Auger <eric.auger@redhat.com>
>>>
>>> ---
>>> v6 -> v7
>>> - check the uapi version
>>>
>>> v3 -> v4:
>>> - adapt to changes in the uapi
>>> - add support for leaf parameter
>>> - do not use arm_smmu_tlb_inv_range_nosync or arm_smmu_tlb_inv_context
>>> anymore
>>>
>>> v2 -> v3:
>>> - replace __arm_smmu_tlb_sync by arm_smmu_cmdq_issue_sync
>>>
>>> v1 -> v2:
>>> - properly pass the asid
>>> ---
>>> drivers/iommu/arm-smmu-v3.c | 60 +++++++++++++++++++++++++++++++++++++
>>> 1 file changed, 60 insertions(+)
>>>
>>> diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
>>> index 1486baf53425..4366921d8318 100644
>>> --- a/drivers/iommu/arm-smmu-v3.c
>>> +++ b/drivers/iommu/arm-smmu-v3.c
>>> @@ -2326,6 +2326,65 @@ static void arm_smmu_detach_pasid_table(struct
>>> iommu_domain *domain)
>>> mutex_unlock(&smmu_domain->init_mutex);
>>> }
>>> +static int
>>> +arm_smmu_cache_invalidate(struct iommu_domain *domain, struct device
>>> *dev,
>>> + struct iommu_cache_invalidate_info *inv_info)
>>> +{
>>> + struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
>>> + struct arm_smmu_device *smmu = smmu_domain->smmu;
>>> +
>>> + if (smmu_domain->stage != ARM_SMMU_DOMAIN_NESTED)
>>> + return -EINVAL;
>>> +
>>> + if (!smmu)
>>> + return -EINVAL;
>>> +
>>> + if (inv_info->version != IOMMU_CACHE_INVALIDATE_INFO_VERSION_1)
>>> + return -EINVAL;
>>> +
>>> + if (inv_info->cache & IOMMU_CACHE_INV_TYPE_IOTLB) {
>>> + if (inv_info->granularity == IOMMU_INV_GRANU_PASID) {
>>> + struct arm_smmu_cmdq_ent cmd = {
>>> + .opcode = CMDQ_OP_TLBI_NH_ASID,
>>> + .tlbi = {
>>> + .vmid = smmu_domain->s2_cfg.vmid,
>>> + .asid = inv_info->pasid,
>>> + },
>>> + };
>>> +
>>> + arm_smmu_cmdq_issue_cmd(smmu, &cmd);
>>> + arm_smmu_cmdq_issue_sync(smmu);
>>
>> I'd much rather make arm_smmu_tlb_inv_context() understand nested
>> domains than open-code commands all over the place.
>
>
>>
>>> +
>>> + } else if (inv_info->granularity == IOMMU_INV_GRANU_ADDR) {
>>> + struct iommu_inv_addr_info *info = &inv_info->addr_info;
>>> + size_t size = info->nb_granules * info->granule_size;
>>> + bool leaf = info->flags & IOMMU_INV_ADDR_FLAGS_LEAF;
>>> + struct arm_smmu_cmdq_ent cmd = {
>>> + .opcode = CMDQ_OP_TLBI_NH_VA,
>>> + .tlbi = {
>>> + .addr = info->addr,
>>> + .vmid = smmu_domain->s2_cfg.vmid,
>>> + .asid = info->pasid,
>>> + .leaf = leaf,
>>> + },
>>> + };
>>> +
>>> + do {
>>> + arm_smmu_cmdq_issue_cmd(smmu, &cmd);
>>> + cmd.tlbi.addr += info->granule_size;
>>> + } while (size -= info->granule_size);
>>> + arm_smmu_cmdq_issue_sync(smmu);
>>
>> An this in particular I would really like to go all the way through
>> io_pgtable_tlb_add_flush()/io_pgtable_sync() if at all possible. Hooking
>> up range-based invalidations is going to be a massive headache if the
>> abstraction isn't solid.
>
> The concern is the host does not "own" the s1 config asid
> (smmu_domain->s1_cfg.cd.asid is not set, practically). In our case the
> asid only is passed by the userspace on CACHE_INVALIDATE ioctl call.
>
> arm_smmu_tlb_inv_context and arm_smmu_tlb_inv_range_nosync use this field
Right, but that's not exactly hard to solve. Even just something like
the (untested, purely illustrative) refactoring below would be beneficial.
Robin.
----->8-----
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index d3880010c6cf..31ef703cf671 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -1423,11 +1423,9 @@ static void arm_smmu_tlb_inv_context(void *cookie)
arm_smmu_cmdq_issue_sync(smmu);
}
-static void arm_smmu_tlb_inv_range_nosync(unsigned long iova, size_t size,
- size_t granule, bool leaf, void *cookie)
+static void __arm_smmu_tlb_inv_range(struct arm_smmu_domain
*smmu_domain, u16 asid,
+ unsigned long iova, size_t size, size_t granule, bool leaf)
{
- struct arm_smmu_domain *smmu_domain = cookie;
- struct arm_smmu_device *smmu = smmu_domain->smmu;
struct arm_smmu_cmdq_ent cmd = {
.tlbi = {
.leaf = leaf,
@@ -1437,18 +1435,27 @@ static void
arm_smmu_tlb_inv_range_nosync(unsigned long iova, size_t size,
if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {
cmd.opcode = CMDQ_OP_TLBI_NH_VA;
- cmd.tlbi.asid = smmu_domain->s1_cfg.cd.asid;
+ cmd.tlbi.asid = asid;
} else {
cmd.opcode = CMDQ_OP_TLBI_S2_IPA;
cmd.tlbi.vmid = smmu_domain->s2_cfg.vmid;
}
do {
- arm_smmu_cmdq_issue_cmd(smmu, &cmd);
+ arm_smmu_cmdq_issue_cmd(smmu_domain->smmu, &cmd);
cmd.tlbi.addr += granule;
} while (size -= granule);
}
+static void arm_smmu_tlb_inv_range_nosync(unsigned long iova, size_t size,
+ size_t granule, bool leaf, void *cookie)
+{
+ struct arm_smmu_domain *smmu_domain = cookie;
+
+ __arm_smmu_tlb_inv_range(smmu_domain, smmu_domain->s1_cfg.cd.asid, iova,
+ size, granule, leaf);
+}
+
static const struct iommu_gather_ops arm_smmu_gather_ops = {
.tlb_flush_all = arm_smmu_tlb_inv_context,
.tlb_add_flush = arm_smmu_tlb_inv_range_nosync,
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next prev parent reply other threads:[~2019-05-13 14:01 UTC|newest]
Thread overview: 83+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-08 12:18 [PATCH v7 00/23] SMMUv3 Nested Stage Setup Eric Auger
2019-04-08 12:18 ` Eric Auger
2019-04-08 12:18 ` [PATCH v7 01/23] driver core: add per device iommu param Eric Auger
2019-04-08 12:18 ` Eric Auger
2019-04-08 12:18 ` [PATCH v7 02/23] iommu: introduce device fault data Eric Auger
2019-04-08 12:18 ` Eric Auger
2019-04-08 12:18 ` [PATCH v7 03/23] iommu: introduce device fault report API Eric Auger
2019-04-08 12:18 ` Eric Auger
2019-04-08 12:18 ` [PATCH v7 04/23] iommu: Introduce attach/detach_pasid_table API Eric Auger
2019-04-08 12:18 ` Eric Auger
2019-05-15 12:09 ` Jean-Philippe Brucker
2019-05-15 13:06 ` Auger Eric
2019-05-15 15:57 ` Jean-Philippe Brucker
2019-04-08 12:18 ` [PATCH v7 06/23] iommu: Introduce bind/unbind_guest_msi Eric Auger
2019-04-08 12:18 ` Eric Auger
2019-05-08 13:59 ` Robin Murphy
2019-05-10 14:35 ` Auger Eric
2019-04-08 12:18 ` [PATCH v7 07/23] vfio: VFIO_IOMMU_ATTACH/DETACH_PASID_TABLE Eric Auger
2019-04-08 12:18 ` Eric Auger
2019-04-08 12:18 ` [PATCH v7 08/23] vfio: VFIO_IOMMU_CACHE_INVALIDATE Eric Auger
2019-04-08 12:18 ` Eric Auger
2019-04-08 12:18 ` [PATCH v7 10/23] iommu/arm-smmu-v3: Link domains and devices Eric Auger
2019-04-08 12:18 ` Eric Auger
2019-04-08 12:18 ` [PATCH v7 11/23] iommu/arm-smmu-v3: Maintain a SID->device structure Eric Auger
2019-04-08 12:18 ` Eric Auger
2019-05-08 14:05 ` Robin Murphy
2019-05-08 18:31 ` Jean-Philippe Brucker
2019-04-08 12:19 ` [PATCH v7 14/23] iommu/smmuv3: Implement cache_invalidate Eric Auger
2019-04-08 12:19 ` Eric Auger
2019-05-08 15:01 ` Robin Murphy
2019-05-13 12:16 ` Auger Eric
2019-05-13 14:01 ` Robin Murphy [this message]
2019-05-13 14:04 ` Auger Eric
2019-04-08 12:19 ` [PATCH v7 15/23] dma-iommu: Implement NESTED_MSI cookie Eric Auger
2019-04-08 12:19 ` Eric Auger
2019-05-08 16:42 ` Robin Murphy
2019-04-08 12:19 ` [PATCH v7 17/23] iommu/smmuv3: Implement bind/unbind_guest_msi Eric Auger
2019-04-08 12:19 ` Eric Auger
2019-04-08 12:19 ` [PATCH v7 18/23] iommu/smmuv3: Report non recoverable faults Eric Auger
2019-04-08 12:19 ` Eric Auger
2019-05-08 17:20 ` Robin Murphy
2019-05-13 7:46 ` Auger Eric
2019-05-13 11:54 ` Robin Murphy
2019-05-13 12:32 ` Auger Eric
2019-05-13 13:47 ` Robin Murphy
2019-04-08 12:19 ` [PATCH v7 19/23] vfio-pci: Add a new VFIO_REGION_TYPE_NESTED region type Eric Auger
2019-04-08 12:19 ` Eric Auger
2019-04-08 12:19 ` [PATCH v7 20/23] vfio-pci: Register an iommu fault handler Eric Auger
2019-04-08 12:19 ` Eric Auger
[not found] ` <20190408121911.24103-1-eric.auger-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2019-04-08 12:18 ` [PATCH v7 05/23] iommu: Introduce cache_invalidate API Eric Auger
2019-04-08 12:18 ` Eric Auger
2019-05-01 10:38 ` Jean-Philippe Brucker
2019-05-01 10:38 ` Jean-Philippe Brucker
2019-05-02 6:58 ` Auger Eric
2019-05-02 6:58 ` Auger Eric
2019-05-02 10:53 ` Jean-Philippe Brucker
2019-05-02 10:53 ` Jean-Philippe Brucker
2019-05-02 16:46 ` Jacob Pan
2019-05-02 16:46 ` Jacob Pan
2019-05-07 11:45 ` Jean-Philippe Brucker
2019-04-08 12:18 ` [PATCH v7 09/23] vfio: VFIO_IOMMU_BIND/UNBIND_MSI Eric Auger
2019-04-08 12:18 ` Eric Auger
2019-04-08 12:19 ` [PATCH v7 12/23] iommu/smmuv3: Get prepared for nested stage support Eric Auger
2019-04-08 12:19 ` Eric Auger
2019-05-08 14:24 ` Robin Murphy
2019-05-10 14:34 ` Auger Eric
2019-05-13 11:43 ` Robin Murphy
2019-05-13 14:40 ` Auger Eric
2019-04-08 12:19 ` [PATCH v7 13/23] iommu/smmuv3: Implement attach/detach_pasid_table Eric Auger
2019-04-08 12:19 ` Eric Auger
2019-05-08 14:38 ` Robin Murphy
2019-05-10 14:35 ` Auger Eric
2019-05-13 12:04 ` Robin Murphy
2019-04-08 12:19 ` [PATCH v7 16/23] iommu/smmuv3: Nested mode single MSI doorbell per domain enforcement Eric Auger
2019-04-08 12:19 ` Eric Auger
2019-04-08 12:19 ` [PATCH v7 21/23] vfio_pci: Allow to mmap the fault queue Eric Auger
2019-04-08 12:19 ` Eric Auger
2019-04-08 12:19 ` [PATCH v7 22/23] vfio-pci: Add VFIO_PCI_DMA_FAULT_IRQ_INDEX Eric Auger
2019-04-08 12:19 ` Eric Auger
2019-04-08 12:19 ` [PATCH v7 23/23] vfio: Document nested stage control Eric Auger
2019-04-08 12:19 ` Eric Auger
2019-04-30 7:09 ` [PATCH v7 00/23] SMMUv3 Nested Stage Setup Auger Eric
2019-04-30 7:09 ` Auger Eric
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