[IA64] Add API for allocating Dynamic TR resource.

Dynamic TR resource should be managed in the uniform way.
Add two interfaces for kernel:
ia64_itr_entry: Allocate a (pair of) TR for caller.
ia64_ptr_entry: Purge a (pair of ) TR by caller.

Signed-off-by: Xiantao Zhang <xiantao.zhang@intel.com>
Signed-off-by: Anthony Xu <anthony.xu@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 196 insertions, 0 deletions

diff --git a/arch/ia64/mm/tlb.c b/arch/ia64/mm/tlb.c
index 655da240d13c..3d8903f936a5 100644
--- a/arch/ia64/mm/tlb.c
+++ b/arch/ia64/mm/tlb.c
@@ -26,6 +26,8 @@
 #include <asm/pal.h>
 #include <asm/tlbflush.h>
 #include <asm/dma.h>
+#include <asm/processor.h>
+#include <asm/tlb.h>
 
 static struct {
         unsigned long mask;     /* mask of supported purge page-sizes */
@@ -39,6 +41,10 @@ struct ia64_ctx ia64_ctx = {
 };
 
 DEFINE_PER_CPU(u8, ia64_need_tlb_flush);
+DEFINE_PER_CPU(u8, ia64_tr_num);  /*Number of TR slots in current processor*/
+DEFINE_PER_CPU(u8, ia64_tr_used); /*Max Slot number used by kernel*/
+
+struct ia64_tr_entry __per_cpu_idtrs[NR_CPUS][2][IA64_TR_ALLOC_MAX];
 
 /*
  * Initializes the ia64_ctx.bitmap array based on max_ctx+1.
@@ -190,6 +196,9 @@ ia64_tlb_init (void)
         ia64_ptce_info_t uninitialized_var(ptce_info); /* GCC be quiet */
         unsigned long tr_pgbits;
         long status;
+        pal_vm_info_1_u_t vm_info_1;
+        pal_vm_info_2_u_t vm_info_2;
+        int cpu = smp_processor_id();
 
         if ((status = ia64_pal_vm_page_size(&tr_pgbits, &purge.mask)) != 0) {
                 printk(KERN_ERR "PAL_VM_PAGE_SIZE failed with status=%ld; "
@@ -206,4 +215,191 @@ ia64_tlb_init (void)
         local_cpu_data->ptce_stride[1] = ptce_info.stride[1];
 
         local_flush_tlb_all();  /* nuke left overs from bootstrapping... */
+        status = ia64_pal_vm_summary(&vm_info_1, &vm_info_2);
+
+        if (status) {
+                printk(KERN_ERR "ia64_pal_vm_summary=%ld\n", status);
+                per_cpu(ia64_tr_num, cpu) = 8;
+                return;
+        }
+        per_cpu(ia64_tr_num, cpu) = vm_info_1.pal_vm_info_1_s.max_itr_entry+1;
+        if (per_cpu(ia64_tr_num, cpu) >
+                                (vm_info_1.pal_vm_info_1_s.max_dtr_entry+1))
+                per_cpu(ia64_tr_num, cpu) =
+                                vm_info_1.pal_vm_info_1_s.max_dtr_entry+1;
+        if (per_cpu(ia64_tr_num, cpu) > IA64_TR_ALLOC_MAX) {
+                per_cpu(ia64_tr_num, cpu) = IA64_TR_ALLOC_MAX;
+                printk(KERN_DEBUG "TR register number exceeds IA64_TR_ALLOC_MAX!"
+                        "IA64_TR_ALLOC_MAX should be extended\n");
+        }
+}
+
+/*
+ * is_tr_overlap
+ *
+ * Check overlap with inserted TRs.
+ */
+static int is_tr_overlap(struct ia64_tr_entry *p, u64 va, u64 log_size)
+{
+        u64 tr_log_size;
+        u64 tr_end;
+        u64 va_rr = ia64_get_rr(va);
+        u64 va_rid = RR_TO_RID(va_rr);
+        u64 va_end = va + (1<<log_size) - 1;
+
+        if (va_rid != RR_TO_RID(p->rr))
+                return 0;
+        tr_log_size = (p->itir & 0xff) >> 2;
+        tr_end = p->ifa + (1<<tr_log_size) - 1;
+
+        if (va > tr_end || p->ifa > va_end)
+                return 0;
+        return 1;
+
+}
+
+/*
+ * ia64_insert_tr in virtual mode. Allocate a TR slot
+ *
+ * target_mask : 0x1 : itr, 0x2 : dtr, 0x3 : idtr
+ *
+ * va   : virtual address.
+ * pte  : pte entries inserted.
+ * log_size: range to be covered.
+ *
+ * Return value:  <0 :  error No.
+ *
+ *                >=0 : slot number allocated for TR.
+ * Must be called with preemption disabled.
+ */
+int ia64_itr_entry(u64 target_mask, u64 va, u64 pte, u64 log_size)
+{
+        int i, r;
+        unsigned long psr;
+        struct ia64_tr_entry *p;
+        int cpu = smp_processor_id();
+
+        r = -EINVAL;
+        /*Check overlap with existing TR entries*/
+        if (target_mask & 0x1) {
+                p = &__per_cpu_idtrs[cpu][0][0];
+                for (i = IA64_TR_ALLOC_BASE; i <= per_cpu(ia64_tr_used, cpu);
+                                                                i++, p++) {
+                        if (p->pte & 0x1)
+                                if (is_tr_overlap(p, va, log_size)) {
+                                        printk(KERN_DEBUG "Overlapped Entry"
+                                                "Inserted for TR Reigster!!\n");
+                                        goto out;
+                        }
+                }
+        }
+        if (target_mask & 0x2) {
+                p = &__per_cpu_idtrs[cpu][1][0];
+                for (i = IA64_TR_ALLOC_BASE; i <= per_cpu(ia64_tr_used, cpu);
+                                                                i++, p++) {
+                        if (p->pte & 0x1)
+                                if (is_tr_overlap(p, va, log_size)) {
+                                        printk(KERN_DEBUG "Overlapped Entry"
+                                                "Inserted for TR Reigster!!\n");
+                                        goto out;
+                                }
+                }
+        }
+
+        for (i = IA64_TR_ALLOC_BASE; i < per_cpu(ia64_tr_num, cpu); i++) {
+                switch (target_mask & 0x3) {
+                case 1:
+                        if (!(__per_cpu_idtrs[cpu][0][i].pte & 0x1))
+                                goto found;
+                        continue;
+                case 2:
+                        if (!(__per_cpu_idtrs[cpu][1][i].pte & 0x1))
+                                goto found;
+                        continue;
+                case 3:
+                        if (!(__per_cpu_idtrs[cpu][0][i].pte & 0x1) &&
+                                !(__per_cpu_idtrs[cpu][1][i].pte & 0x1))
+                                goto found;
+                        continue;
+                default:
+                        r = -EINVAL;
+                        goto out;
+                }
+        }
+found:
+        if (i >= per_cpu(ia64_tr_num, cpu))
+                return -EBUSY;
+
+        /*Record tr info for mca hander use!*/
+        if (i > per_cpu(ia64_tr_used, cpu))
+                per_cpu(ia64_tr_used, cpu) = i;
+
+        psr = ia64_clear_ic();
+        if (target_mask & 0x1) {
+                ia64_itr(0x1, i, va, pte, log_size);
+                ia64_srlz_i();
+                p = &__per_cpu_idtrs[cpu][0][i];
+                p->ifa = va;
+                p->pte = pte;
+                p->itir = log_size << 2;
+                p->rr = ia64_get_rr(va);
+        }
+        if (target_mask & 0x2) {
+                ia64_itr(0x2, i, va, pte, log_size);
+                ia64_srlz_i();
+                p = &__per_cpu_idtrs[cpu][1][i];
+                p->ifa = va;
+                p->pte = pte;
+                p->itir = log_size << 2;
+                p->rr = ia64_get_rr(va);
+        }
+        ia64_set_psr(psr);
+        r = i;
+out:
+        return r;
+}
+EXPORT_SYMBOL_GPL(ia64_itr_entry);
+
+/*
+ * ia64_purge_tr
+ *
+ * target_mask: 0x1: purge itr, 0x2 : purge dtr, 0x3 purge idtr.
+ * slot: slot number to be freed.
+ *
+ * Must be called with preemption disabled.
+ */
+void ia64_ptr_entry(u64 target_mask, int slot)
+{
+        int cpu = smp_processor_id();
+        int i;
+        struct ia64_tr_entry *p;
+
+        if (slot < IA64_TR_ALLOC_BASE || slot >= per_cpu(ia64_tr_num, cpu))
+                return;
+
+        if (target_mask & 0x1) {
+                p = &__per_cpu_idtrs[cpu][0][slot];
+                if ((p->pte&0x1) && is_tr_overlap(p, p->ifa, p->itir>>2)) {
+                        p->pte = 0;
+                        ia64_ptr(0x1, p->ifa, p->itir>>2);
+                        ia64_srlz_i();
+                }
+        }
+
+        if (target_mask & 0x2) {
+                p = &__per_cpu_idtrs[cpu][1][slot];
+                if ((p->pte & 0x1) && is_tr_overlap(p, p->ifa, p->itir>>2)) {
+                        p->pte = 0;
+                        ia64_ptr(0x2, p->ifa, p->itir>>2);
+                        ia64_srlz_i();
+                }
+        }
+
+        for (i = per_cpu(ia64_tr_used, cpu); i >= IA64_TR_ALLOC_BASE; i--) {
+                if ((__per_cpu_idtrs[cpu][0][i].pte & 0x1) ||
+                                (__per_cpu_idtrs[cpu][1][i].pte & 0x1))
+                        break;
+        }
+        per_cpu(ia64_tr_used, cpu) = i;
 }
+EXPORT_SYMBOL_GPL(ia64_ptr_entry);