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[xen staging] xen/arm: smmuv3: Remove support for Stage-1 translation on SMMUv3.



commit 86e7167f48e8eb3277de242bd98ad0787944d243
Author:     Rahul Singh <rahul.singh@xxxxxxx>
AuthorDate: Wed Jan 20 14:52:38 2021 +0000
Commit:     Julien Grall <jgrall@xxxxxxxxxx>
CommitDate: Sat Jan 23 11:48:33 2021 +0000

    xen/arm: smmuv3: Remove support for Stage-1 translation on SMMUv3.
    
    Linux SMMUv3 driver supports both Stage-1 and Stage-2 translations.
    As of now only Stage-2 translation support has been tested.
    
    Once Stage-1 translation support is tested this patch can be added.
    
    Signed-off-by: Rahul Singh <rahul.singh@xxxxxxx>
    Acked-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
 xen/drivers/passthrough/arm/smmu-v3.c | 468 ++--------------------------------
 1 file changed, 15 insertions(+), 453 deletions(-)

diff --git a/xen/drivers/passthrough/arm/smmu-v3.c 
b/xen/drivers/passthrough/arm/smmu-v3.c
index 7b29ead48c..869f38b753 100644
--- a/xen/drivers/passthrough/arm/smmu-v3.c
+++ b/xen/drivers/passthrough/arm/smmu-v3.c
@@ -449,19 +449,14 @@ struct arm_smmu_cmdq_ent {
 
                #define CMDQ_OP_CFGI_STE        0x3
                #define CMDQ_OP_CFGI_ALL        0x4
-               #define CMDQ_OP_CFGI_CD         0x5
-               #define CMDQ_OP_CFGI_CD_ALL     0x6
                struct {
                        u32                     sid;
-                       u32                     ssid;
                        union {
                                bool            leaf;
                                u8              span;
                        };
                } cfgi;
 
-               #define CMDQ_OP_TLBI_NH_ASID    0x11
-               #define CMDQ_OP_TLBI_NH_VA      0x12
                #define CMDQ_OP_TLBI_EL2_ALL    0x20
                #define CMDQ_OP_TLBI_S12_VMALL  0x28
                #define CMDQ_OP_TLBI_S2_IPA     0x2a
@@ -541,32 +536,6 @@ struct arm_smmu_strtab_l1_desc {
        dma_addr_t                      l2ptr_dma;
 };
 
-struct arm_smmu_ctx_desc {
-       u16                             asid;
-       u64                             ttbr;
-       u64                             tcr;
-       u64                             mair;
-};
-
-struct arm_smmu_l1_ctx_desc {
-       __le64                          *l2ptr;
-       dma_addr_t                      l2ptr_dma;
-};
-
-struct arm_smmu_ctx_desc_cfg {
-       __le64                          *cdtab;
-       dma_addr_t                      cdtab_dma;
-       struct arm_smmu_l1_ctx_desc     *l1_desc;
-       unsigned int                    num_l1_ents;
-};
-
-struct arm_smmu_s1_cfg {
-       struct arm_smmu_ctx_desc_cfg    cdcfg;
-       struct arm_smmu_ctx_desc        cd;
-       u8                              s1fmt;
-       u8                              s1cdmax;
-};
-
 struct arm_smmu_s2_cfg {
        u16                             vmid;
        u64                             vttbr;
@@ -623,15 +592,10 @@ struct arm_smmu_device {
        unsigned long                   oas; /* PA */
        unsigned long                   pgsize_bitmap;
 
-#define ARM_SMMU_MAX_ASIDS             (1 << 16)
-       unsigned int                    asid_bits;
-       DECLARE_BITMAP(asid_map, ARM_SMMU_MAX_ASIDS);
-
 #define ARM_SMMU_MAX_VMIDS             (1 << 16)
        unsigned int                    vmid_bits;
        DECLARE_BITMAP(vmid_map, ARM_SMMU_MAX_VMIDS);
 
-       unsigned int                    ssid_bits;
        unsigned int                    sid_bits;
 
        struct arm_smmu_strtab_cfg      strtab_cfg;
@@ -655,7 +619,6 @@ struct arm_smmu_master {
        u32                             *sids;
        unsigned int                    num_sids;
        bool                            ats_enabled;
-       unsigned int                    ssid_bits;
 };
 
 /* SMMU private data for an IOMMU domain */
@@ -675,10 +638,7 @@ 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_s2_cfg  s2_cfg;
 
        struct iommu_domain             domain;
 
@@ -869,34 +829,19 @@ static int arm_smmu_cmdq_build_cmd(u64 *cmd, struct 
arm_smmu_cmdq_ent *ent)
                cmd[1] |= FIELD_PREP(CMDQ_PREFETCH_1_SIZE, ent->prefetch.size);
                cmd[1] |= ent->prefetch.addr & CMDQ_PREFETCH_1_ADDR_MASK;
                break;
-       case CMDQ_OP_CFGI_CD:
-               cmd[0] |= FIELD_PREP(CMDQ_CFGI_0_SSID, ent->cfgi.ssid);
-               /* Fallthrough */
        case CMDQ_OP_CFGI_STE:
                cmd[0] |= FIELD_PREP(CMDQ_CFGI_0_SID, ent->cfgi.sid);
                cmd[1] |= FIELD_PREP(CMDQ_CFGI_1_LEAF, ent->cfgi.leaf);
                break;
-       case CMDQ_OP_CFGI_CD_ALL:
-               cmd[0] |= FIELD_PREP(CMDQ_CFGI_0_SID, ent->cfgi.sid);
-               break;
        case CMDQ_OP_CFGI_ALL:
                /* Cover the entire SID range */
                cmd[1] |= FIELD_PREP(CMDQ_CFGI_1_RANGE, 31);
                break;
-       case CMDQ_OP_TLBI_NH_VA:
-               cmd[0] |= FIELD_PREP(CMDQ_TLBI_0_VMID, ent->tlbi.vmid);
-               cmd[0] |= FIELD_PREP(CMDQ_TLBI_0_ASID, ent->tlbi.asid);
-               cmd[1] |= FIELD_PREP(CMDQ_TLBI_1_LEAF, ent->tlbi.leaf);
-               cmd[1] |= ent->tlbi.addr & CMDQ_TLBI_1_VA_MASK;
-               break;
        case CMDQ_OP_TLBI_S2_IPA:
                cmd[0] |= FIELD_PREP(CMDQ_TLBI_0_VMID, ent->tlbi.vmid);
                cmd[1] |= FIELD_PREP(CMDQ_TLBI_1_LEAF, ent->tlbi.leaf);
                cmd[1] |= ent->tlbi.addr & CMDQ_TLBI_1_IPA_MASK;
                break;
-       case CMDQ_OP_TLBI_NH_ASID:
-               cmd[0] |= FIELD_PREP(CMDQ_TLBI_0_ASID, ent->tlbi.asid);
-               /* Fallthrough */
        case CMDQ_OP_TLBI_S12_VMALL:
                cmd[0] |= FIELD_PREP(CMDQ_TLBI_0_VMID, ent->tlbi.vmid);
                break;
@@ -1109,242 +1054,6 @@ static int arm_smmu_cmdq_issue_sync(struct 
arm_smmu_device *smmu)
        return ret;
 }
 
-/* Context descriptor manipulation functions */
-static void arm_smmu_sync_cd(struct arm_smmu_domain *smmu_domain,
-                            int ssid, bool leaf)
-{
-       size_t i;
-       unsigned long flags;
-       struct arm_smmu_master *master;
-       struct arm_smmu_device *smmu = smmu_domain->smmu;
-       struct arm_smmu_cmdq_ent cmd = {
-               .opcode = CMDQ_OP_CFGI_CD,
-               .cfgi   = {
-                       .ssid   = ssid,
-                       .leaf   = leaf,
-               },
-       };
-
-       spin_lock_irqsave(&smmu_domain->devices_lock, flags);
-       list_for_each_entry(master, &smmu_domain->devices, domain_head) {
-               for (i = 0; i < master->num_sids; i++) {
-                       cmd.cfgi.sid = master->sids[i];
-                       arm_smmu_cmdq_issue_cmd(smmu, &cmd);
-               }
-       }
-       spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
-
-       arm_smmu_cmdq_issue_sync(smmu);
-}
-
-static int arm_smmu_alloc_cd_leaf_table(struct arm_smmu_device *smmu,
-                                       struct arm_smmu_l1_ctx_desc *l1_desc)
-{
-       size_t size = CTXDESC_L2_ENTRIES * (CTXDESC_CD_DWORDS << 3);
-
-       l1_desc->l2ptr = dmam_alloc_coherent(smmu->dev, size,
-                                            &l1_desc->l2ptr_dma, GFP_KERNEL);
-       if (!l1_desc->l2ptr) {
-               dev_warn(smmu->dev,
-                        "failed to allocate context descriptor table\n");
-               return -ENOMEM;
-       }
-       return 0;
-}
-
-static void arm_smmu_write_cd_l1_desc(__le64 *dst,
-                                     struct arm_smmu_l1_ctx_desc *l1_desc)
-{
-       u64 val = (l1_desc->l2ptr_dma & CTXDESC_L1_DESC_L2PTR_MASK) |
-                 CTXDESC_L1_DESC_V;
-
-       /* See comment in arm_smmu_write_ctx_desc() */
-       WRITE_ONCE(*dst, cpu_to_le64(val));
-}
-
-static __le64 *arm_smmu_get_cd_ptr(struct arm_smmu_domain *smmu_domain,
-                                  u32 ssid)
-{
-       __le64 *l1ptr;
-       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;
-
-       if (smmu_domain->s1_cfg.s1fmt == STRTAB_STE_0_S1FMT_LINEAR)
-               return cdcfg->cdtab + ssid * CTXDESC_CD_DWORDS;
-
-       idx = ssid >> CTXDESC_SPLIT;
-       l1_desc = &cdcfg->l1_desc[idx];
-       if (!l1_desc->l2ptr) {
-               if (arm_smmu_alloc_cd_leaf_table(smmu, l1_desc))
-                       return NULL;
-
-               l1ptr = cdcfg->cdtab + idx * CTXDESC_L1_DESC_DWORDS;
-               arm_smmu_write_cd_l1_desc(l1ptr, l1_desc);
-               /* An invalid L1CD can be cached */
-               arm_smmu_sync_cd(smmu_domain, ssid, false);
-       }
-       idx = ssid & (CTXDESC_L2_ENTRIES - 1);
-       return l1_desc->l2ptr + idx * CTXDESC_CD_DWORDS;
-}
-
-static int arm_smmu_write_ctx_desc(struct arm_smmu_domain *smmu_domain,
-                                  int ssid, struct arm_smmu_ctx_desc *cd)
-{
-       /*
-        * This function handles the following cases:
-        *
-        * (1) Install primary CD, for normal DMA traffic (SSID = 0).
-        * (2) Install a secondary CD, for SID+SSID traffic.
-        * (3) Update ASID of a CD. Atomically write the first 64 bits of the
-        *     CD, then invalidate the old entry and mappings.
-        * (4) Remove a secondary CD.
-        */
-       u64 val;
-       bool cd_live;
-       __le64 *cdptr;
-       struct arm_smmu_device *smmu = smmu_domain->smmu;
-
-       if (WARN_ON(ssid >= (1 << smmu_domain->s1_cfg.s1cdmax)))
-               return -E2BIG;
-
-       cdptr = arm_smmu_get_cd_ptr(smmu_domain, ssid);
-       if (!cdptr)
-               return -ENOMEM;
-
-       val = le64_to_cpu(cdptr[0]);
-       cd_live = !!(val & CTXDESC_CD_0_V);
-
-       if (!cd) { /* (4) */
-               val = 0;
-       } else if (cd_live) { /* (3) */
-               val &= ~CTXDESC_CD_0_ASID;
-               val |= FIELD_PREP(CTXDESC_CD_0_ASID, cd->asid);
-               /*
-                * Until CD+TLB invalidation, both ASIDs may be used for tagging
-                * this substream's traffic
-                */
-       } else { /* (1) and (2) */
-               cdptr[1] = cpu_to_le64(cd->ttbr & CTXDESC_CD_1_TTB0_MASK);
-               cdptr[2] = 0;
-               cdptr[3] = cpu_to_le64(cd->mair);
-
-               /*
-                * STE is live, and the SMMU might read dwords of this CD in any
-                * order. Ensure that it observes valid values before reading
-                * V=1.
-                */
-               arm_smmu_sync_cd(smmu_domain, ssid, true);
-
-               val = cd->tcr |
-#ifdef __BIG_ENDIAN
-                       CTXDESC_CD_0_ENDI |
-#endif
-                       CTXDESC_CD_0_R | CTXDESC_CD_0_A | CTXDESC_CD_0_ASET |
-                       CTXDESC_CD_0_AA64 |
-                       FIELD_PREP(CTXDESC_CD_0_ASID, cd->asid) |
-                       CTXDESC_CD_0_V;
-
-               /* STALL_MODEL==0b10 && CD.S==0 is ILLEGAL */
-               if (smmu->features & ARM_SMMU_FEAT_STALL_FORCE)
-                       val |= CTXDESC_CD_0_S;
-       }
-
-       /*
-        * The SMMU accesses 64-bit values atomically. See IHI0070Ca 3.21.3
-        * "Configuration structures and configuration invalidation completion"
-        *
-        *   The size of single-copy atomic reads made by the SMMU is
-        *   IMPLEMENTATION DEFINED but must be at least 64 bits. Any single
-        *   field within an aligned 64-bit span of a structure can be altered
-        *   without first making the structure invalid.
-        */
-       WRITE_ONCE(cdptr[0], cpu_to_le64(val));
-       arm_smmu_sync_cd(smmu_domain, ssid, true);
-       return 0;
-}
-
-static int arm_smmu_alloc_cd_tables(struct arm_smmu_domain *smmu_domain)
-{
-       int ret;
-       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_ctx_desc_cfg *cdcfg = &cfg->cdcfg;
-
-       max_contexts = 1 << cfg->s1cdmax;
-
-       if (!(smmu->features & ARM_SMMU_FEAT_2_LVL_CDTAB) ||
-           max_contexts <= CTXDESC_L2_ENTRIES) {
-               cfg->s1fmt = STRTAB_STE_0_S1FMT_LINEAR;
-               cdcfg->num_l1_ents = max_contexts;
-
-               l1size = max_contexts * (CTXDESC_CD_DWORDS << 3);
-       } else {
-               cfg->s1fmt = STRTAB_STE_0_S1FMT_64K_L2;
-               cdcfg->num_l1_ents = DIV_ROUND_UP(max_contexts,
-                                                 CTXDESC_L2_ENTRIES);
-
-               cdcfg->l1_desc = devm_kcalloc(smmu->dev, cdcfg->num_l1_ents,
-                                             sizeof(*cdcfg->l1_desc),
-                                             GFP_KERNEL);
-               if (!cdcfg->l1_desc)
-                       return -ENOMEM;
-
-               l1size = cdcfg->num_l1_ents * (CTXDESC_L1_DESC_DWORDS << 3);
-       }
-
-       cdcfg->cdtab = dmam_alloc_coherent(smmu->dev, l1size, &cdcfg->cdtab_dma,
-                                          GFP_KERNEL);
-       if (!cdcfg->cdtab) {
-               dev_warn(smmu->dev, "failed to allocate context descriptor\n");
-               ret = -ENOMEM;
-               goto err_free_l1;
-       }
-
-       return 0;
-
-err_free_l1:
-       if (cdcfg->l1_desc) {
-               devm_kfree(smmu->dev, cdcfg->l1_desc);
-               cdcfg->l1_desc = NULL;
-       }
-       return ret;
-}
-
-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;
-
-       if (cdcfg->l1_desc) {
-               size = CTXDESC_L2_ENTRIES * (CTXDESC_CD_DWORDS << 3);
-
-               for (i = 0; i < cdcfg->num_l1_ents; i++) {
-                       if (!cdcfg->l1_desc[i].l2ptr)
-                               continue;
-
-                       dmam_free_coherent(smmu->dev, size,
-                                          cdcfg->l1_desc[i].l2ptr,
-                                          cdcfg->l1_desc[i].l2ptr_dma);
-               }
-               devm_kfree(smmu->dev, cdcfg->l1_desc);
-               cdcfg->l1_desc = NULL;
-
-               l1size = cdcfg->num_l1_ents * (CTXDESC_L1_DESC_DWORDS << 3);
-       } else {
-               l1size = cdcfg->num_l1_ents * (CTXDESC_CD_DWORDS << 3);
-       }
-
-       dmam_free_coherent(smmu->dev, l1size, cdcfg->cdtab, cdcfg->cdtab_dma);
-       cdcfg->cdtab_dma = 0;
-       cdcfg->cdtab = NULL;
-}
-
 /* Stream table manipulation functions */
 static void
 arm_smmu_write_strtab_l1_desc(__le64 *dst, struct arm_smmu_strtab_l1_desc 
*desc)
@@ -1394,7 +1103,6 @@ static void arm_smmu_write_strtab_ent(struct 
arm_smmu_master *master, u32 sid,
        u64 val = le64_to_cpu(dst[0]);
        bool ste_live = false;
        struct arm_smmu_device *smmu = NULL;
-       struct arm_smmu_s1_cfg *s1_cfg = NULL;
        struct arm_smmu_s2_cfg *s2_cfg = NULL;
        struct arm_smmu_domain *smmu_domain = NULL;
        struct arm_smmu_cmdq_ent prefetch_cmd = {
@@ -1409,25 +1117,13 @@ static void arm_smmu_write_strtab_ent(struct 
arm_smmu_master *master, u32 sid,
                smmu = master->smmu;
        }
 
-       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;
-               }
-       }
+       if (smmu_domain)
+               s2_cfg = &smmu_domain->s2_cfg;
 
        if (val & STRTAB_STE_0_V) {
                switch (FIELD_GET(STRTAB_STE_0_CFG, val)) {
                case STRTAB_STE_0_CFG_BYPASS:
                        break;
-               case STRTAB_STE_0_CFG_S1_TRANS:
                case STRTAB_STE_0_CFG_S2_TRANS:
                        ste_live = true;
                        break;
@@ -1443,7 +1139,7 @@ static void arm_smmu_write_strtab_ent(struct 
arm_smmu_master *master, u32 sid,
        val = STRTAB_STE_0_V;
 
        /* Bypass/fault */
-       if (!smmu_domain || !(s1_cfg || s2_cfg)) {
+       if (!smmu_domain || !(s2_cfg)) {
                if (!smmu_domain && disable_bypass)
                        val |= FIELD_PREP(STRTAB_STE_0_CFG, 
STRTAB_STE_0_CFG_ABORT);
                else
@@ -1462,25 +1158,6 @@ static void arm_smmu_write_strtab_ent(struct 
arm_smmu_master *master, u32 sid,
                return;
        }
 
-       if (s1_cfg) {
-               BUG_ON(ste_live);
-               dst[1] = cpu_to_le64(
-                        FIELD_PREP(STRTAB_STE_1_S1DSS, 
STRTAB_STE_1_S1DSS_SSID0) |
-                        FIELD_PREP(STRTAB_STE_1_S1CIR, 
STRTAB_STE_1_S1C_CACHE_WBRA) |
-                        FIELD_PREP(STRTAB_STE_1_S1COR, 
STRTAB_STE_1_S1C_CACHE_WBRA) |
-                        FIELD_PREP(STRTAB_STE_1_S1CSH, ARM_SMMU_SH_ISH) |
-                        FIELD_PREP(STRTAB_STE_1_STRW, 
STRTAB_STE_1_STRW_NSEL1));
-
-               if (smmu->features & ARM_SMMU_FEAT_STALLS &&
-                  !(smmu->features & ARM_SMMU_FEAT_STALL_FORCE))
-                       dst[1] |= cpu_to_le64(STRTAB_STE_1_S1STALLD);
-
-               val |= (s1_cfg->cdcfg.cdtab_dma & STRTAB_STE_0_S1CTXPTR_MASK) |
-                       FIELD_PREP(STRTAB_STE_0_CFG, STRTAB_STE_0_CFG_S1_TRANS) 
|
-                       FIELD_PREP(STRTAB_STE_0_S1CDMAX, s1_cfg->s1cdmax) |
-                       FIELD_PREP(STRTAB_STE_0_S1FMT, s1_cfg->s1fmt);
-       }
-
        if (s2_cfg) {
                BUG_ON(ste_live);
                dst[2] = cpu_to_le64(
@@ -1502,7 +1179,6 @@ static void arm_smmu_write_strtab_ent(struct 
arm_smmu_master *master, u32 sid,
                                                 STRTAB_STE_1_EATS_TRANS));
 
        arm_smmu_sync_ste_for_sid(smmu, sid);
-       /* See comment in arm_smmu_write_ctx_desc() */
        WRITE_ONCE(dst[0], cpu_to_le64(val));
        arm_smmu_sync_ste_for_sid(smmu, sid);
 
@@ -1822,14 +1498,8 @@ static void arm_smmu_tlb_inv_context(void *cookie)
        struct arm_smmu_device *smmu = smmu_domain->smmu;
        struct arm_smmu_cmdq_ent cmd;
 
-       if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {
-               cmd.opcode      = CMDQ_OP_TLBI_NH_ASID;
-               cmd.tlbi.asid   = smmu_domain->s1_cfg.cd.asid;
-               cmd.tlbi.vmid   = 0;
-       } else {
-               cmd.opcode      = CMDQ_OP_TLBI_S12_VMALL;
-               cmd.tlbi.vmid   = smmu_domain->s2_cfg.vmid;
-       }
+       cmd.opcode      = CMDQ_OP_TLBI_S12_VMALL;
+       cmd.tlbi.vmid   = smmu_domain->s2_cfg.vmid;
 
        /*
         * NOTE: when io-pgtable is in non-strict mode, we may get here with
@@ -1857,13 +1527,8 @@ static void arm_smmu_tlb_inv_range_nosync(unsigned long 
iova, size_t size,
        if (!size)
                return;
 
-       if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {
-               cmd.opcode      = CMDQ_OP_TLBI_NH_VA;
-               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.opcode      = CMDQ_OP_TLBI_S2_IPA;
+       cmd.tlbi.vmid   = smmu_domain->s2_cfg.vmid;
 
        do {
                arm_smmu_cmdq_issue_cmd(smmu, &cmd);
@@ -1971,75 +1636,17 @@ 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_s2_cfg *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;
-
-               if (cfg->cdcfg.cdtab) {
-                       arm_smmu_free_cd_tables(smmu_domain);
-                       arm_smmu_bitmap_free(smmu->asid_map, cfg->cd.asid);
-               }
-       } else {
-               struct arm_smmu_s2_cfg *cfg = &smmu_domain->s2_cfg;
-               if (cfg->vmid)
-                       arm_smmu_bitmap_free(smmu->vmid_map, cfg->vmid);
-       }
+       if (cfg->vmid)
+               arm_smmu_bitmap_free(smmu->vmid_map, cfg->vmid);
 
        kfree(smmu_domain);
 }
 
-static int arm_smmu_domain_finalise_s1(struct arm_smmu_domain *smmu_domain,
-                                      struct arm_smmu_master *master,
-                                      struct io_pgtable_cfg *pgtbl_cfg)
-{
-       int ret;
-       int 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;
-
-       asid = arm_smmu_bitmap_alloc(smmu->asid_map, smmu->asid_bits);
-       if (asid < 0)
-               return asid;
-
-       cfg->s1cdmax = master->ssid_bits;
-
-       ret = arm_smmu_alloc_cd_tables(smmu_domain);
-       if (ret)
-               goto out_free_asid;
-
-       cfg->cd.asid    = (u16)asid;
-       cfg->cd.ttbr    = pgtbl_cfg->arm_lpae_s1_cfg.ttbr;
-       cfg->cd.tcr     = FIELD_PREP(CTXDESC_CD_0_TCR_T0SZ, tcr->tsz) |
-                         FIELD_PREP(CTXDESC_CD_0_TCR_TG0, tcr->tg) |
-                         FIELD_PREP(CTXDESC_CD_0_TCR_IRGN0, tcr->irgn) |
-                         FIELD_PREP(CTXDESC_CD_0_TCR_ORGN0, tcr->orgn) |
-                         FIELD_PREP(CTXDESC_CD_0_TCR_SH0, tcr->sh) |
-                         FIELD_PREP(CTXDESC_CD_0_TCR_IPS, tcr->ips) |
-                         CTXDESC_CD_0_TCR_EPD1 | CTXDESC_CD_0_AA64;
-       cfg->cd.mair    = pgtbl_cfg->arm_lpae_s1_cfg.mair;
-
-       /*
-        * Note that this will end up calling arm_smmu_sync_cd() before
-        * the master has been added to the devices list for this domain.
-        * This isn't an issue because the STE hasn't been installed yet.
-        */
-       ret = arm_smmu_write_ctx_desc(smmu_domain, 0, &cfg->cd);
-       if (ret)
-               goto out_free_cd_tables;
-
-       return 0;
-
-out_free_cd_tables:
-       arm_smmu_free_cd_tables(smmu_domain);
-out_free_asid:
-       arm_smmu_bitmap_free(smmu->asid_map, asid);
-       return ret;
-}
 
 static int arm_smmu_domain_finalise_s2(struct arm_smmu_domain *smmu_domain,
                                       struct arm_smmu_master *master,
@@ -2075,9 +1682,6 @@ static int arm_smmu_domain_finalise(struct iommu_domain 
*domain,
        enum io_pgtable_fmt fmt;
        struct io_pgtable_cfg pgtbl_cfg;
        struct io_pgtable_ops *pgtbl_ops;
-       int (*finalise_stage_fn)(struct arm_smmu_domain *,
-                                struct arm_smmu_master *,
-                                struct io_pgtable_cfg *);
        struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
        struct arm_smmu_device *smmu = smmu_domain->smmu;
 
@@ -2087,29 +1691,8 @@ static int arm_smmu_domain_finalise(struct iommu_domain 
*domain,
        }
 
        /* Restrict the stage to what we can actually support */
-       if (!(smmu->features & ARM_SMMU_FEAT_TRANS_S1))
-               smmu_domain->stage = ARM_SMMU_DOMAIN_S2;
-       if (!(smmu->features & ARM_SMMU_FEAT_TRANS_S2))
-               smmu_domain->stage = ARM_SMMU_DOMAIN_S1;
-
-       switch (smmu_domain->stage) {
-       case ARM_SMMU_DOMAIN_S1:
-               ias = (smmu->features & ARM_SMMU_FEAT_VAX) ? 52 : 48;
-               ias = min_t(unsigned long, ias, VA_BITS);
-               oas = smmu->ias;
-               fmt = ARM_64_LPAE_S1;
-               finalise_stage_fn = arm_smmu_domain_finalise_s1;
-               break;
-       case ARM_SMMU_DOMAIN_NESTED:
-       case ARM_SMMU_DOMAIN_S2:
-               ias = smmu->ias;
-               oas = smmu->oas;
-               fmt = ARM_64_LPAE_S2;
-               finalise_stage_fn = arm_smmu_domain_finalise_s2;
-               break;
-       default:
-               return -EINVAL;
-       }
+       smmu_domain->stage = ARM_SMMU_DOMAIN_S2;
+
 
        pgtbl_cfg = (struct io_pgtable_cfg) {
                .pgsize_bitmap  = smmu->pgsize_bitmap,
@@ -2131,7 +1714,7 @@ static int arm_smmu_domain_finalise(struct iommu_domain 
*domain,
        domain->geometry.aperture_end = (1UL << pgtbl_cfg.ias) - 1;
        domain->geometry.force_aperture = true;
 
-       ret = finalise_stage_fn(smmu_domain, master, &pgtbl_cfg);
+       ret = arm_smmu_domain_finalise_s2(smmu_domain, master, &pgtbl_cfg);
        if (ret < 0) {
                free_io_pgtable_ops(pgtbl_ops);
                return ret;
@@ -2264,8 +1847,6 @@ static int arm_smmu_enable_pasid(struct arm_smmu_master 
*master)
                return ret;
        }
 
-       master->ssid_bits = min_t(u8, ilog2(num_pasids),
-                                 master->smmu->ssid_bits);
        return 0;
 }
 
@@ -2281,7 +1862,6 @@ static void arm_smmu_disable_pasid(struct arm_smmu_master 
*master)
        if (!pdev->pasid_enabled)
                return;
 
-       master->ssid_bits = 0;
        pci_disable_pasid(pdev);
 }
 
@@ -2337,13 +1917,6 @@ static int arm_smmu_attach_dev(struct iommu_domain 
*domain, struct device *dev)
                        dev_name(smmu->dev));
                ret = -ENXIO;
                goto out_unlock;
-       } else if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1 &&
-                  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);
-               ret = -EINVAL;
-               goto out_unlock;
        }
 
        master->domain = smmu_domain;
@@ -2490,8 +2063,6 @@ static struct iommu_device *arm_smmu_probe_device(struct 
device *dev)
                }
        }
 
-       master->ssid_bits = min(smmu->ssid_bits, fwspec->num_pasid_bits);
-
        /*
         * Note that PASID must be enabled before, and disabled after ATS:
         * PCI Express Base 4.0r1.0 - 10.5.1.3 ATS Control Register
@@ -2502,10 +2073,6 @@ static struct iommu_device *arm_smmu_probe_device(struct 
device *dev)
         */
        arm_smmu_enable_pasid(master);
 
-       if (!(smmu->features & ARM_SMMU_FEAT_2_LVL_CDTAB))
-               master->ssid_bits = min_t(u8, master->ssid_bits,
-                                         CTXDESC_LINEAR_CDMAX);
-
        return &smmu->iommu;
 
 err_free_master:
@@ -3259,13 +2826,10 @@ static int arm_smmu_device_hw_probe(struct 
arm_smmu_device *smmu)
                smmu->features |= ARM_SMMU_FEAT_STALLS;
        }
 
-       if (reg & IDR0_S1P)
-               smmu->features |= ARM_SMMU_FEAT_TRANS_S1;
-
        if (reg & IDR0_S2P)
                smmu->features |= ARM_SMMU_FEAT_TRANS_S2;
 
-       if (!(reg & (IDR0_S1P | IDR0_S2P))) {
+       if (!(reg & IDR0_S2P)) {
                dev_err(smmu->dev, "no translation support!\n");
                return -ENXIO;
        }
@@ -3283,7 +2847,6 @@ static int arm_smmu_device_hw_probe(struct 
arm_smmu_device *smmu)
        }
 
        /* ASID/VMID sizes */
-       smmu->asid_bits = reg & IDR0_ASID16 ? 16 : 8;
        smmu->vmid_bits = reg & IDR0_VMID16 ? 16 : 8;
 
        /* IDR1 */
@@ -3308,7 +2871,6 @@ static int arm_smmu_device_hw_probe(struct 
arm_smmu_device *smmu)
                                             FIELD_GET(IDR1_PRIQS, reg));
 
        /* SID/SSID sizes */
-       smmu->ssid_bits = FIELD_GET(IDR1_SSIDSIZE, reg);
        smmu->sid_bits = FIELD_GET(IDR1_SIDSIZE, reg);
 
        /*
--
generated by git-patchbot for /home/xen/git/xen.git#staging



 


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