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iommu/arm-smmu-v3: Manage ASIDs with xarray

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In preparation for sharing some ASIDs with the CPU, use a global xarray to
store ASIDs and their context. ASID#0 is now reserved, and the ASID
space is global.

Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Link: https://lore.kernel.org/r/20200519175502.2504091-9-jean-philippe@linaro.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Jean-Philippe Brucker 2020-05-19 19:54:46 +02:00 committed by Will Deacon
parent 52f3fab006
commit 0299a1a81c
1 changed files with 18 additions and 9 deletions
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27
drivers/iommu/arm-smmu-v3.c
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@ -667,7 +667,6 @@ struct arm_smmu_device {
#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;
@ -727,6 +726,8 @@ struct arm_smmu_option_prop {
const char *prop;
};
static DEFINE_XARRAY_ALLOC1(asid_xa);
static struct arm_smmu_option_prop arm_smmu_options[] = {
{ ARM_SMMU_OPT_SKIP_PREFETCH, "hisilicon,broken-prefetch-cmd" },
{ ARM_SMMU_OPT_PAGE0_REGS_ONLY, "cavium,cn9900-broken-page1-regspace"},
@ -1765,6 +1766,14 @@ static void arm_smmu_free_cd_tables(struct arm_smmu_domain *smmu_domain)
cdcfg->cdtab = NULL;
}
static void arm_smmu_free_asid(struct arm_smmu_ctx_desc *cd)
{
if (!cd->asid)
return;
xa_erase(&asid_xa, cd->asid);
}
/* Stream table manipulation functions */
static void
arm_smmu_write_strtab_l1_desc(__le64 *dst, struct arm_smmu_strtab_l1_desc *desc)
@ -2450,10 +2459,9 @@ static void arm_smmu_domain_free(struct iommu_domain *domain)
if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {
struct arm_smmu_s1_cfg *cfg = &smmu_domain->s1_cfg;
if (cfg->cdcfg.cdtab) {
if (cfg->cdcfg.cdtab)
arm_smmu_free_cd_tables(smmu_domain);
arm_smmu_bitmap_free(smmu->asid_map, cfg->cd.asid);
}
arm_smmu_free_asid(&cfg->cd);
} else {
struct arm_smmu_s2_cfg *cfg = &smmu_domain->s2_cfg;
if (cfg->vmid)
@ -2468,14 +2476,15 @@ static int arm_smmu_domain_finalise_s1(struct arm_smmu_domain *smmu_domain,
struct io_pgtable_cfg *pgtbl_cfg)
{
int ret;
int asid;
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;
asid = arm_smmu_bitmap_alloc(smmu->asid_map, smmu->asid_bits);
if (asid < 0)
return asid;
ret = xa_alloc(&asid_xa, &asid, &cfg->cd,
XA_LIMIT(1, (1 << smmu->asid_bits) - 1), GFP_KERNEL);
if (ret)
return ret;
cfg->s1cdmax = master->ssid_bits;
@ -2508,7 +2517,7 @@ static int arm_smmu_domain_finalise_s1(struct arm_smmu_domain *smmu_domain,
out_free_cd_tables:
arm_smmu_free_cd_tables(smmu_domain);
out_free_asid:
arm_smmu_bitmap_free(smmu->asid_map, asid);
arm_smmu_free_asid(&cfg->cd);
return ret;
}