diff options
| -rw-r--r-- | drivers/misc/cxl/fault.c | 28 |
1 files changed, 22 insertions, 6 deletions
diff --git a/drivers/misc/cxl/fault.c b/drivers/misc/cxl/fault.c index cb4f3231b451..c99e896604ee 100644 --- a/drivers/misc/cxl/fault.c +++ b/drivers/misc/cxl/fault.c @@ -21,11 +21,20 @@ #include "cxl.h" -/* This finds a free SSTE for the given SLB */ +static bool sste_matches(struct cxl_sste *sste, struct copro_slb *slb) +{ + return ((sste->vsid_data == cpu_to_be64(slb->vsid)) && + (sste->esid_data == cpu_to_be64(slb->esid))); +} + +/* + * This finds a free SSTE for the given SLB, or returns NULL if it's already in + * the segment table. + */ static struct cxl_sste* find_free_sste(struct cxl_context *ctx, struct copro_slb *slb) { - struct cxl_sste *primary, *sste; + struct cxl_sste *primary, *sste, *ret = NULL; unsigned int mask = (ctx->sst_size >> 7) - 1; /* SSTP0[SegTableSize] */ unsigned int entry; unsigned int hash; @@ -38,15 +47,19 @@ static struct cxl_sste* find_free_sste(struct cxl_context *ctx, primary = ctx->sstp + (hash << 3); for (entry = 0, sste = primary; entry < 8; entry++, sste++) { - if (!(be64_to_cpu(sste->esid_data) & SLB_ESID_V)) - return sste; + if (!ret && !(be64_to_cpu(sste->esid_data) & SLB_ESID_V)) + ret = sste; + if (sste_matches(sste, slb)) + return NULL; } + if (ret) + return ret; /* Nothing free, select an entry to cast out */ - sste = primary + ctx->sst_lru; + ret = primary + ctx->sst_lru; ctx->sst_lru = (ctx->sst_lru + 1) & 0x7; - return sste; + return ret; } static void cxl_load_segment(struct cxl_context *ctx, struct copro_slb *slb) @@ -57,12 +70,15 @@ static void cxl_load_segment(struct cxl_context *ctx, struct copro_slb *slb) spin_lock_irqsave(&ctx->sste_lock, flags); sste = find_free_sste(ctx, slb); + if (!sste) + goto out_unlock; pr_devel("CXL Populating SST[%li]: %#llx %#llx\n", sste - ctx->sstp, slb->vsid, slb->esid); sste->vsid_data = cpu_to_be64(slb->vsid); sste->esid_data = cpu_to_be64(slb->esid); +out_unlock: spin_unlock_irqrestore(&ctx->sste_lock, flags); } |