[PATCH 28/45] ia64: Add API for allocating Dynamic TR resource

From: Avi Kivity
Date: Thu Apr 17 2008 - 05:23:34 EST

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From: Xiantao Zhang <xiantao.zhang@xxxxxxxxx>

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@xxxxxxxxx>
Signed-off-by: Anthony Xu <anthony.xu@xxxxxxxxx>
Signed-off-by: Avi Kivity <avi@xxxxxxxxxxxx>
---
arch/ia64/kernel/mca.c | 49 +++++++++++
arch/ia64/kernel/mca_asm.S | 5 +
arch/ia64/mm/tlb.c | 198 ++++++++++++++++++++++++++++++++++++++++++++
include/asm-ia64/kregs.h | 3 +
include/asm-ia64/tlb.h | 26 ++++++
5 files changed, 281 insertions(+), 0 deletions(-)

diff --git a/arch/ia64/kernel/mca.c b/arch/ia64/kernel/mca.c
index 6c18221..607006a 100644
--- a/arch/ia64/kernel/mca.c
+++ b/arch/ia64/kernel/mca.c
@@ -97,6 +97,7 @@

#include <asm/irq.h>
#include <asm/hw_irq.h>
+#include <asm/tlb.h>

#include "mca_drv.h"
#include "entry.h"
@@ -112,6 +113,7 @@ DEFINE_PER_CPU(u64, ia64_mca_data); /* == __per_cpu_mca[smp_processor_id()] */
DEFINE_PER_CPU(u64, ia64_mca_per_cpu_pte); /* PTE to map per-CPU area */
DEFINE_PER_CPU(u64, ia64_mca_pal_pte); /* PTE to map PAL code */
DEFINE_PER_CPU(u64, ia64_mca_pal_base); /* vaddr PAL code granule */
+DEFINE_PER_CPU(u64, ia64_mca_tr_reload); /* Flag for TR reload */

unsigned long __per_cpu_mca[NR_CPUS];

@@ -1182,6 +1184,49 @@ all_in:
return;
}

+/* mca_insert_tr
+ *
+ * Switch rid when TR reload and needed!
+ * iord: 1: itr, 2: itr;
+ *
+*/
+static void mca_insert_tr(u64 iord)
+{
+
+ int i;
+ u64 old_rr;
+ struct ia64_tr_entry *p;
+ unsigned long psr;
+ int cpu = smp_processor_id();
+
+ psr = ia64_clear_ic();
+ for (i = IA64_TR_ALLOC_BASE; i < IA64_TR_ALLOC_MAX; i++) {
+ p = &__per_cpu_idtrs[cpu][iord-1][i];
+ if (p->pte & 0x1) {
+ old_rr = ia64_get_rr(p->ifa);
+ if (old_rr != p->rr) {
+ ia64_set_rr(p->ifa, p->rr);
+ ia64_srlz_d();
+ }
+ ia64_ptr(iord, p->ifa, p->itir >> 2);
+ ia64_srlz_i();
+ if (iord & 0x1) {
+ ia64_itr(0x1, i, p->ifa, p->pte, p->itir >> 2);
+ ia64_srlz_i();
+ }
+ if (iord & 0x2) {
+ ia64_itr(0x2, i, p->ifa, p->pte, p->itir >> 2);
+ ia64_srlz_i();
+ }
+ if (old_rr != p->rr) {
+ ia64_set_rr(p->ifa, old_rr);
+ ia64_srlz_d();
+ }
+ }
+ }
+ ia64_set_psr(psr);
+}
+
/*
* ia64_mca_handler
*
@@ -1271,6 +1316,10 @@ ia64_mca_handler(struct pt_regs *regs, struct switch_stack *sw,
monarch_cpu = -1;
#endif
}
+ if (__get_cpu_var(ia64_mca_tr_reload)) {
+ mca_insert_tr(0x1); /*Reload dynamic itrs*/
+ mca_insert_tr(0x2); /*Reload dynamic itrs*/
+ }
if (notify_die(DIE_MCA_MONARCH_LEAVE, "MCA", regs, (long)&nd, 0, recover)
== NOTIFY_STOP)
ia64_mca_spin(__func__);
diff --git a/arch/ia64/kernel/mca_asm.S b/arch/ia64/kernel/mca_asm.S
index 8bc7d25..a06d465 100644
--- a/arch/ia64/kernel/mca_asm.S
+++ b/arch/ia64/kernel/mca_asm.S
@@ -219,8 +219,13 @@ ia64_reload_tr:
mov r20=IA64_TR_CURRENT_STACK
;;
itr.d dtr[r20]=r16
+ GET_THIS_PADDR(r2, ia64_mca_tr_reload)
+ mov r18 = 1
;;
srlz.d
+ ;;
+ st8 [r2] =r18
+ ;;

done_tlb_purge_and_reload:

diff --git a/arch/ia64/mm/tlb.c b/arch/ia64/mm/tlb.c
index 655da24..626100c 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 +215,193 @@ 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.
+ * 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)) {
+ r = -EBUSY;
+ goto out;
+ }
+
+ /*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.
+ *
+ * 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);
diff --git a/include/asm-ia64/kregs.h b/include/asm-ia64/kregs.h
index 7e55a58..aefcdfe 100644
--- a/include/asm-ia64/kregs.h
+++ b/include/asm-ia64/kregs.h
@@ -31,6 +31,9 @@
#define IA64_TR_PALCODE 1 /* itr1: maps PALcode as required by EFI */
#define IA64_TR_CURRENT_STACK 1 /* dtr1: maps kernel's memory- & register-stacks */

+#define IA64_TR_ALLOC_BASE 2 /* itr&dtr: Base of dynamic TR resource*/
+#define IA64_TR_ALLOC_MAX 32 /* Max number for dynamic use*/
+
/* Processor status register bits: */
#define IA64_PSR_BE_BIT 1
#define IA64_PSR_UP_BIT 2
diff --git a/include/asm-ia64/tlb.h b/include/asm-ia64/tlb.h
index 26edcb7..20d8a39 100644
--- a/include/asm-ia64/tlb.h
+++ b/include/asm-ia64/tlb.h
@@ -64,6 +64,32 @@ struct mmu_gather {
struct page *pages[FREE_PTE_NR];
};

+struct ia64_tr_entry {
+ u64 ifa;
+ u64 itir;
+ u64 pte;
+ u64 rr;
+}; /*Record for tr entry!*/
+
+extern int ia64_itr_entry(u64 target_mask, u64 va, u64 pte, u64 log_size);
+extern void ia64_ptr_entry(u64 target_mask, int slot);
+
+extern struct ia64_tr_entry __per_cpu_idtrs[NR_CPUS][2][IA64_TR_ALLOC_MAX];
+
+/*
+ region register macros
+*/
+#define RR_TO_VE(val) (((val) >> 0) & 0x0000000000000001)
+#define RR_VE(val) (((val) & 0x0000000000000001) << 0)
+#define RR_VE_MASK 0x0000000000000001L
+#define RR_VE_SHIFT 0
+#define RR_TO_PS(val) (((val) >> 2) & 0x000000000000003f)
+#define RR_PS(val) (((val) & 0x000000000000003f) << 2)
+#define RR_PS_MASK 0x00000000000000fcL
+#define RR_PS_SHIFT 2
+#define RR_RID_MASK 0x00000000ffffff00L
+#define RR_TO_RID(val) ((val >> 8) & 0xffffff)
+
/* Users of the generic TLB shootdown code must declare this storage space. */
DECLARE_PER_CPU(struct mmu_gather, mmu_gathers);

--
1.5.5

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