[SPARC64]: Only use bypass accesses to INO buckets.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/arch/sparc64/kernel/irq.c b/arch/sparc64/kernel/irq.c
index 4e9537c..dc51bdf 100644 (file)
--- a/arch/sparc64/kernel/irq.c
+++ b/arch/sparc64/kernel/irq.c
@@ -42,6 +42,7 @@
 #include <asm/auxio.h>
 #include <asm/head.h>
 #include <asm/hypervisor.h>
+#include <asm/cacheflush.h>
 
 /* UPA nodes send interrupt packet to UltraSparc with first data reg
  * value low 5 (7 on Starfire) bits holding the IRQ identifier being
@@ -56,10 +57,10 @@
  * of the vectored interrupt trap handler(s) in entry.S and sun4v_ivec.S
  */
 struct ino_bucket {
-/*0x00*/unsigned long irq_chain_pa;
+/*0x00*/unsigned long __irq_chain_pa;
 
        /* Virtual interrupt number assigned to this INO.  */
-/*0x08*/unsigned int virt_irq;
+/*0x08*/unsigned int __virt_irq;
 /*0x0c*/unsigned int __pad;
 };
 
@@ -67,6 +68,60 @@ struct ino_bucket {
 struct ino_bucket *ivector_table;
 unsigned long ivector_table_pa;
 
+/* On several sun4u processors, it is illegal to mix bypass and
+ * non-bypass accesses.  Therefore we access all INO buckets
+ * using bypass accesses only.
+ */
+static unsigned long bucket_get_chain_pa(unsigned long bucket_pa)
+{
+       unsigned long ret;
+
+       __asm__ __volatile__("ldxa      [%1] %2, %0"
+                            : "=&r" (ret)
+                            : "r" (bucket_pa +
+                                   offsetof(struct ino_bucket,
+                                            __irq_chain_pa)),
+                              "i" (ASI_PHYS_USE_EC));
+
+       return ret;
+}
+
+static void bucket_clear_chain_pa(unsigned long bucket_pa)
+{
+       __asm__ __volatile__("stxa      %%g0, [%0] %1"
+                            : /* no outputs */
+                            : "r" (bucket_pa +
+                                   offsetof(struct ino_bucket,
+                                            __irq_chain_pa)),
+                              "i" (ASI_PHYS_USE_EC));
+}
+
+static unsigned int bucket_get_virt_irq(unsigned long bucket_pa)
+{
+       unsigned int ret;
+
+       __asm__ __volatile__("lduwa     [%1] %2, %0"
+                            : "=&r" (ret)
+                            : "r" (bucket_pa +
+                                   offsetof(struct ino_bucket,
+                                            __virt_irq)),
+                              "i" (ASI_PHYS_USE_EC));
+
+       return ret;
+}
+
+static void bucket_set_virt_irq(unsigned long bucket_pa,
+                               unsigned int virt_irq)
+{
+       __asm__ __volatile__("stwa      %0, [%1] %2"
+                            : /* no outputs */
+                            : "r" (virt_irq),
+                              "r" (bucket_pa +
+                                   offsetof(struct ino_bucket,
+                                            __virt_irq)),
+                              "i" (ASI_PHYS_USE_EC));
+}
+
 #define __irq_ino(irq) \
         (((struct ino_bucket *)(irq)) - &ivector_table[0])
 #define __bucket(irq) ((struct ino_bucket *)(irq))
@@ -569,18 +624,21 @@ unsigned int build_irq(int inofixup, unsigned long iclr, unsigned long imap)
 {
        struct ino_bucket *bucket;
        struct irq_handler_data *data;
+       unsigned int virt_irq;
        int ino;
 
        BUG_ON(tlb_type == hypervisor);
 
        ino = (upa_readq(imap) & (IMAP_IGN | IMAP_INO)) + inofixup;
        bucket = &ivector_table[ino];
-       if (!bucket->virt_irq) {
-               bucket->virt_irq = virt_irq_alloc(__irq(bucket));
-               set_irq_chip(bucket->virt_irq, &sun4u_irq);
+       virt_irq = bucket_get_virt_irq(__pa(bucket));
+       if (!virt_irq) {
+               virt_irq = virt_irq_alloc(__irq(bucket));
+               bucket_set_virt_irq(__pa(bucket), virt_irq);
+               set_irq_chip(virt_irq, &sun4u_irq);
        }
 
-       data = get_irq_chip_data(bucket->virt_irq);
+       data = get_irq_chip_data(virt_irq);
        if (unlikely(data))
                goto out;
 
@@ -589,13 +647,13 @@ unsigned int build_irq(int inofixup, unsigned long iclr, unsigned long imap)
                prom_printf("IRQ: kzalloc(irq_handler_data) failed.\n");
                prom_halt();
        }
-       set_irq_chip_data(bucket->virt_irq, data);
+       set_irq_chip_data(virt_irq, data);
 
        data->imap  = imap;
        data->iclr  = iclr;
 
 out:
-       return bucket->virt_irq;
+       return virt_irq;
 }
 
 static unsigned int sun4v_build_common(unsigned long sysino,
@@ -603,16 +661,19 @@ static unsigned int sun4v_build_common(unsigned long sysino,
 {
        struct ino_bucket *bucket;
        struct irq_handler_data *data;
+       unsigned int virt_irq;
 
        BUG_ON(tlb_type != hypervisor);
 
        bucket = &ivector_table[sysino];
-       if (!bucket->virt_irq) {
-               bucket->virt_irq = virt_irq_alloc(__irq(bucket));
-               set_irq_chip(bucket->virt_irq, chip);
+       virt_irq = bucket_get_virt_irq(__pa(bucket));
+       if (!virt_irq) {
+               virt_irq = virt_irq_alloc(__irq(bucket));
+               bucket_set_virt_irq(__pa(bucket), virt_irq);
+               set_irq_chip(virt_irq, chip);
        }
 
-       data = get_irq_chip_data(bucket->virt_irq);
+       data = get_irq_chip_data(virt_irq);
        if (unlikely(data))
                goto out;
 
@@ -621,7 +682,7 @@ static unsigned int sun4v_build_common(unsigned long sysino,
                prom_printf("IRQ: kzalloc(irq_handler_data) failed.\n");
                prom_halt();
        }
-       set_irq_chip_data(bucket->virt_irq, data);
+       set_irq_chip_data(virt_irq, data);
 
        /* Catch accidental accesses to these things.  IMAP/ICLR handling
         * is done by hypervisor calls on sun4v platforms, not by direct
@@ -631,7 +692,7 @@ static unsigned int sun4v_build_common(unsigned long sysino,
        data->iclr = ~0UL;
 
 out:
-       return bucket->virt_irq;
+       return virt_irq;
 }
 
 unsigned int sun4v_build_irq(u32 devhandle, unsigned int devino)
@@ -646,19 +707,24 @@ unsigned int sun4v_build_virq(u32 devhandle, unsigned int devino)
        struct irq_handler_data *data;
        struct ino_bucket *bucket;
        unsigned long hv_err, cookie;
+       unsigned int virt_irq;
 
        bucket = kzalloc(sizeof(struct ino_bucket), GFP_ATOMIC);
        if (unlikely(!bucket))
                return 0;
+       __flush_dcache_range((unsigned long) bucket,
+                            ((unsigned long) bucket +
+                             sizeof(struct ino_bucket)));
 
-       bucket->virt_irq = virt_irq_alloc(__irq(bucket));
-       set_irq_chip(bucket->virt_irq, &sun4v_virq);
+       virt_irq = virt_irq_alloc(__irq(bucket));
+       bucket_set_virt_irq(__pa(bucket), virt_irq);
+       set_irq_chip(virt_irq, &sun4v_virq);
 
        data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
        if (unlikely(!data))
                return 0;
 
-       set_irq_chip_data(bucket->virt_irq, data);
+       set_irq_chip_data(virt_irq, data);
 
        /* Catch accidental accesses to these things.  IMAP/ICLR handling
         * is done by hypervisor calls on sun4v platforms, not by direct
@@ -675,10 +741,10 @@ unsigned int sun4v_build_virq(u32 devhandle, unsigned int devino)
                prom_halt();
        }
 
-       virt_to_real_irq_table[bucket->virt_irq].dev_handle = devhandle;
-       virt_to_real_irq_table[bucket->virt_irq].dev_ino = devino;
+       virt_to_real_irq_table[virt_irq].dev_handle = devhandle;
+       virt_to_real_irq_table[virt_irq].dev_ino = devino;
 
-       return bucket->virt_irq;
+       return virt_irq;
 }
 
 void ack_bad_irq(unsigned int virt_irq)
@@ -718,17 +784,9 @@ void handler_irq(int irq, struct pt_regs *regs)
                unsigned long next_pa;
                unsigned int virt_irq;
 
-               __asm__ __volatile__("ldxa      [%2] %4, %0\n\t"
-                                    "lduwa     [%3] %4, %1\n\t"
-                                    "stxa      %%g0, [%2] %4"
-                                    : "=&r" (next_pa), "=&r" (virt_irq)
-                                    : "r" (bucket_pa +
-                                           offsetof(struct ino_bucket,
-                                                    irq_chain_pa)),
-                                      "r" (bucket_pa +
-                                           offsetof(struct ino_bucket,
-                                                    virt_irq)),
-                                      "i" (ASI_PHYS_USE_EC));
+               next_pa = bucket_get_chain_pa(bucket_pa);
+               virt_irq = bucket_get_virt_irq(bucket_pa);
+               bucket_clear_chain_pa(bucket_pa);
 
                __do_IRQ(virt_irq);
 
@@ -957,6 +1015,8 @@ void __init init_IRQ(void)
                prom_printf("Fatal error, cannot allocate ivector_table\n");
                prom_halt();
        }
+       __flush_dcache_range((unsigned long) ivector_table,
+                            ((unsigned long) ivector_table) + size);
 
        ivector_table_pa = __pa(ivector_table);
 

diff --git a/arch/sparc64/mm/init.c b/arch/sparc64/mm/init.c
index 3010227..f0ab9aa 100644 (file)
--- a/arch/sparc64/mm/init.c
+++ b/arch/sparc64/mm/init.c
@@ -631,7 +631,6 @@ void prom_world(int enter)
        __asm__ __volatile__("flushw");
 }
 
-#ifdef DCACHE_ALIASING_POSSIBLE
 void __flush_dcache_range(unsigned long start, unsigned long end)
 {
        unsigned long va;
@@ -655,7 +654,6 @@ void __flush_dcache_range(unsigned long start, unsigned long end)
                                               "i" (ASI_DCACHE_INVALIDATE));
        }
 }
-#endif /* DCACHE_ALIASING_POSSIBLE */
 
 /* get_new_mmu_context() uses "cache + 1".  */
 DEFINE_SPINLOCK(ctx_alloc_lock);