Re: [PATCH v12 04/15] iommu/smmuv3: Dynamically allocate s1_cfg and s2_cfg

From: Auger Eric
Date: Tue Nov 17 2020 - 07:36:43 EST

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In reply to: Shameerali Kolothum Thodi: "RE: [PATCH v12 04/15] iommu/smmuv3: Dynamically allocate s1_cfg and s2_cfg"
Next in thread: Eric Auger: "[PATCH v12 05/15] iommu/smmuv3: Get prepared for nested stage support"
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Hi Shameer,

On 11/17/20 12:39 PM, Shameerali Kolothum Thodi wrote:
> Hi Eric,
>
>> -----Original Message-----
>> From: Eric Auger [mailto:eric.auger@xxxxxxxxxx]
>> Sent: 16 November 2020 10:43
>> To: eric.auger.pro@xxxxxxxxx; eric.auger@xxxxxxxxxx;
>> iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
>> kvm@xxxxxxxxxxxxxxx; kvmarm@xxxxxxxxxxxxxxxxxxxxx; will@xxxxxxxxxx;
>> joro@xxxxxxxxxx; maz@xxxxxxxxxx; robin.murphy@xxxxxxx
>> Cc: jean-philippe@xxxxxxxxxx; zhangfei.gao@xxxxxxxxxx;
>> zhangfei.gao@xxxxxxxxx; vivek.gautam@xxxxxxx; Shameerali Kolothum
>> Thodi <shameerali.kolothum.thodi@xxxxxxxxxx>;
>> alex.williamson@xxxxxxxxxx; jacob.jun.pan@xxxxxxxxxxxxxxx;
>> yi.l.liu@xxxxxxxxx; tn@xxxxxxxxxxxx; nicoleotsuka@xxxxxxxxx
>> Subject: [PATCH v12 04/15] iommu/smmuv3: Dynamically allocate s1_cfg and
>> s2_cfg
>>
>> In preparation for the introduction of nested stages
>> let's turn s1_cfg and s2_cfg fields into pointers which are
>> dynamically allocated depending on the smmu_domain stage.
>
> This will break compile if we have CONFIG_ARM_SMMU_V3_SVA
> because ,
> https://github.com/eauger/linux/blob/5.10-rc4-2stage-v12/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c#L40
>
> Do we really need to make these pointers?

Thanks for reporting. I think I can do differently. Working on this now.

Thanks

Eric
>
> Thanks,
> Shameer
>
>> In nested mode, both stages will coexist and s1_cfg will
>> be allocated when the guest configuration gets passed.
>>
>> Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx>
>> ---
>> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 83 ++++++++++++---------
>> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 6 +-
>> 2 files changed, 48 insertions(+), 41 deletions(-)
>>
>> diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
>> b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
>> index d828d6cbeb0e..4baf9fafe462 100644
>> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
>> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
>> @@ -953,9 +953,9 @@ static __le64 *arm_smmu_get_cd_ptr(struct
>> arm_smmu_domain *smmu_domain,
>> unsigned int idx;
>> struct arm_smmu_l1_ctx_desc *l1_desc;
>> struct arm_smmu_device *smmu = smmu_domain->smmu;
>> - struct arm_smmu_ctx_desc_cfg *cdcfg = &smmu_domain->s1_cfg.cdcfg;
>> + struct arm_smmu_ctx_desc_cfg *cdcfg =
>> &smmu_domain->s1_cfg->cdcfg;
>>
>> - if (smmu_domain->s1_cfg.s1fmt == STRTAB_STE_0_S1FMT_LINEAR)
>> + if (smmu_domain->s1_cfg->s1fmt == STRTAB_STE_0_S1FMT_LINEAR)
>> return cdcfg->cdtab + ssid * CTXDESC_CD_DWORDS;
>>
>> idx = ssid >> CTXDESC_SPLIT;
>> @@ -990,7 +990,7 @@ int arm_smmu_write_ctx_desc(struct
>> arm_smmu_domain *smmu_domain, int ssid,
>> __le64 *cdptr;
>> struct arm_smmu_device *smmu = smmu_domain->smmu;
>>
>> - if (WARN_ON(ssid >= (1 << smmu_domain->s1_cfg.s1cdmax)))
>> + if (WARN_ON(ssid >= (1 << smmu_domain->s1_cfg->s1cdmax)))
>> return -E2BIG;
>>
>> cdptr = arm_smmu_get_cd_ptr(smmu_domain, ssid);
>> @@ -1056,7 +1056,7 @@ static int arm_smmu_alloc_cd_tables(struct
>> arm_smmu_domain *smmu_domain)
>> size_t l1size;
>> size_t max_contexts;
>> struct arm_smmu_device *smmu = smmu_domain->smmu;
>> - struct arm_smmu_s1_cfg *cfg = &smmu_domain->s1_cfg;
>> + struct arm_smmu_s1_cfg *cfg = smmu_domain->s1_cfg;
>> struct arm_smmu_ctx_desc_cfg *cdcfg = &cfg->cdcfg;
>>
>> max_contexts = 1 << cfg->s1cdmax;
>> @@ -1104,7 +1104,7 @@ static void arm_smmu_free_cd_tables(struct
>> arm_smmu_domain *smmu_domain)
>> int i;
>> size_t size, l1size;
>> struct arm_smmu_device *smmu = smmu_domain->smmu;
>> - struct arm_smmu_ctx_desc_cfg *cdcfg = &smmu_domain->s1_cfg.cdcfg;
>> + struct arm_smmu_ctx_desc_cfg *cdcfg =
>> &smmu_domain->s1_cfg->cdcfg;
>>
>> if (cdcfg->l1_desc) {
>> size = CTXDESC_L2_ENTRIES * (CTXDESC_CD_DWORDS << 3);
>> @@ -1211,17 +1211,8 @@ static void arm_smmu_write_strtab_ent(struct
>> arm_smmu_master *master, u32 sid,
>> }
>>
>> if (smmu_domain) {
>> - switch (smmu_domain->stage) {
>> - case ARM_SMMU_DOMAIN_S1:
>> - s1_cfg = &smmu_domain->s1_cfg;
>> - break;
>> - case ARM_SMMU_DOMAIN_S2:
>> - case ARM_SMMU_DOMAIN_NESTED:
>> - s2_cfg = &smmu_domain->s2_cfg;
>> - break;
>> - default:
>> - break;
>> - }
>> + s1_cfg = smmu_domain->s1_cfg;
>> + s2_cfg = smmu_domain->s2_cfg;
>> }
>>
>> if (val & STRTAB_STE_0_V) {
>> @@ -1664,10 +1655,10 @@ static void arm_smmu_tlb_inv_context(void
>> *cookie)
>> * careful, 007.
>> */
>> if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {
>> - arm_smmu_tlb_inv_asid(smmu, smmu_domain->s1_cfg.cd.asid);
>> + arm_smmu_tlb_inv_asid(smmu, smmu_domain->s1_cfg->cd.asid);
>> } else {
>> cmd.opcode = CMDQ_OP_TLBI_S12_VMALL;
>> - cmd.tlbi.vmid = smmu_domain->s2_cfg.vmid;
>> + cmd.tlbi.vmid = smmu_domain->s2_cfg->vmid;
>> arm_smmu_cmdq_issue_cmd(smmu, &cmd);
>> arm_smmu_cmdq_issue_sync(smmu);
>> }
>> @@ -1693,10 +1684,10 @@ static void arm_smmu_tlb_inv_range(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 = smmu_domain->s1_cfg->cd.asid;
>> } else {
>> cmd.opcode = CMDQ_OP_TLBI_S2_IPA;
>> - cmd.tlbi.vmid = smmu_domain->s2_cfg.vmid;
>> + cmd.tlbi.vmid = smmu_domain->s2_cfg->vmid;
>> }
>>
>> if (smmu->features & ARM_SMMU_FEAT_RANGE_INV) {
>> @@ -1846,24 +1837,25 @@ static void arm_smmu_domain_free(struct
>> iommu_domain *domain)
>> {
>> struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
>> struct arm_smmu_device *smmu = smmu_domain->smmu;
>> + struct arm_smmu_s1_cfg *s1_cfg = smmu_domain->s1_cfg;
>> + struct arm_smmu_s2_cfg *s2_cfg = smmu_domain->s2_cfg;
>>
>> iommu_put_dma_cookie(domain);
>> free_io_pgtable_ops(smmu_domain->pgtbl_ops);
>>
>> /* Free the CD and ASID, if we allocated them */
>> - if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {
>> - struct arm_smmu_s1_cfg *cfg = &smmu_domain->s1_cfg;
>> -
>> - /* Prevent SVA from touching the CD while we're freeing it */
>> + if (s1_cfg) {
>> mutex_lock(&arm_smmu_asid_lock);
>> - if (cfg->cdcfg.cdtab)
>> + /* Prevent SVA from touching the CD while we're freeing it */
>> + if (s1_cfg->cdcfg.cdtab)
>> arm_smmu_free_cd_tables(smmu_domain);
>> - arm_smmu_free_asid(&cfg->cd);
>> + arm_smmu_free_asid(&s1_cfg->cd);
>> mutex_unlock(&arm_smmu_asid_lock);
>> - } else {
>> - struct arm_smmu_s2_cfg *cfg = &smmu_domain->s2_cfg;
>> - if (cfg->vmid)
>> - arm_smmu_bitmap_free(smmu->vmid_map, cfg->vmid);
>> + }
>> + if (s2_cfg) {
>> + if (s2_cfg->vmid)
>> + arm_smmu_bitmap_free(smmu->vmid_map, s2_cfg->vmid);
>> + kfree(s2_cfg);
>> }
>>
>> kfree(smmu_domain);
>> @@ -1876,8 +1868,11 @@ static int arm_smmu_domain_finalise_s1(struct
>> arm_smmu_domain *smmu_domain,
>> int ret;
>> u32 asid;
>> struct arm_smmu_device *smmu = smmu_domain->smmu;
>> - struct arm_smmu_s1_cfg *cfg = &smmu_domain->s1_cfg;
>> typeof(&pgtbl_cfg->arm_lpae_s1_cfg.tcr) tcr =
>> &pgtbl_cfg->arm_lpae_s1_cfg.tcr;
>> + struct arm_smmu_s1_cfg *cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
>> +
>> + if (!cfg)
>> + return -ENOMEM;
>>
>> refcount_set(&cfg->cd.refs, 1);
>>
>> @@ -1890,6 +1885,8 @@ static int arm_smmu_domain_finalise_s1(struct
>> arm_smmu_domain *smmu_domain,
>>
>> cfg->s1cdmax = master->ssid_bits;
>>
>> + smmu_domain->s1_cfg = cfg;
>> +
>> ret = arm_smmu_alloc_cd_tables(smmu_domain);
>> if (ret)
>> goto out_free_asid;
>> @@ -1922,6 +1919,8 @@ static int arm_smmu_domain_finalise_s1(struct
>> arm_smmu_domain *smmu_domain,
>> out_free_asid:
>> arm_smmu_free_asid(&cfg->cd);
>> out_unlock:
>> + kfree(cfg);
>> + smmu_domain->s1_cfg = NULL;
>> mutex_unlock(&arm_smmu_asid_lock);
>> return ret;
>> }
>> @@ -1930,14 +1929,19 @@ static int arm_smmu_domain_finalise_s2(struct
>> arm_smmu_domain *smmu_domain,
>> struct arm_smmu_master *master,
>> struct io_pgtable_cfg *pgtbl_cfg)
>> {
>> - int vmid;
>> + int vmid, ret;
>> struct arm_smmu_device *smmu = smmu_domain->smmu;
>> - struct arm_smmu_s2_cfg *cfg = &smmu_domain->s2_cfg;
>> + struct arm_smmu_s2_cfg *cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
>> typeof(&pgtbl_cfg->arm_lpae_s2_cfg.vtcr) vtcr;
>>
>> + if (!cfg)
>> + return -ENOMEM;
>> +
>> vmid = arm_smmu_bitmap_alloc(smmu->vmid_map, smmu->vmid_bits);
>> - if (vmid < 0)
>> - return vmid;
>> + if (vmid < 0) {
>> + ret = vmid;
>> + goto out_free_cfg;
>> + }
>>
>> vtcr = &pgtbl_cfg->arm_lpae_s2_cfg.vtcr;
>> cfg->vmid = (u16)vmid;
>> @@ -1949,7 +1953,12 @@ static int arm_smmu_domain_finalise_s2(struct
>> arm_smmu_domain *smmu_domain,
>> FIELD_PREP(STRTAB_STE_2_VTCR_S2SH0, vtcr->sh) |
>> FIELD_PREP(STRTAB_STE_2_VTCR_S2TG, vtcr->tg) |
>> FIELD_PREP(STRTAB_STE_2_VTCR_S2PS, vtcr->ps);
>> + smmu_domain->s2_cfg = cfg;
>> return 0;
>> +
>> +out_free_cfg:
>> + kfree(cfg);
>> + return ret;
>> }
>>
>> static int arm_smmu_domain_finalise(struct iommu_domain *domain,
>> @@ -2231,10 +2240,10 @@ static int arm_smmu_attach_dev(struct
>> iommu_domain *domain, struct device *dev)
>> ret = -ENXIO;
>> goto out_unlock;
>> } else if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1 &&
>> - master->ssid_bits != smmu_domain->s1_cfg.s1cdmax) {
>> + master->ssid_bits != smmu_domain->s1_cfg->s1cdmax) {
>> dev_err(dev,
>> "cannot attach to incompatible domain (%u SSID bits != %u)\n",
>> - smmu_domain->s1_cfg.s1cdmax, master->ssid_bits);
>> + smmu_domain->s1_cfg->s1cdmax, master->ssid_bits);
>> ret = -EINVAL;
>> goto out_unlock;
>> }
>> diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
>> b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
>> index 2944beb1571b..6fdc35b32dbf 100644
>> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
>> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
>> @@ -679,10 +679,8 @@ struct arm_smmu_domain {
>> atomic_t nr_ats_masters;
>>
>> enum arm_smmu_domain_stage stage;
>> - union {
>> - struct arm_smmu_s1_cfg s1_cfg;
>> - struct arm_smmu_s2_cfg s2_cfg;
>> - };
>> + struct arm_smmu_s1_cfg *s1_cfg;
>> + struct arm_smmu_s2_cfg *s2_cfg;
>>
>> struct iommu_domain domain;
>>
>> --
>> 2.21.3
>

Next message: Lee Jones: "Re: [PATCH v2] mfd: syscon: Add syscon_regmap_lookup_by_phandle_optional() function."
Previous message: Cristian Marussi: "[PATCH v5 5/5] dt-bindings: arm: add support for SCMI Regulators"
In reply to: Shameerali Kolothum Thodi: "RE: [PATCH v12 04/15] iommu/smmuv3: Dynamically allocate s1_cfg and s2_cfg"
Next in thread: Eric Auger: "[PATCH v12 05/15] iommu/smmuv3: Get prepared for nested stage support"
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