Merge branch 'for_paulus' of master.kernel.org:/pub/scm/linux/kernel/git/galak/powerpc

[pandora-kernel.git] / arch / mips / mm / tlb-r4k.c

diff --git a/arch/mips/mm/tlb-r4k.c b/arch/mips/mm/tlb-r4k.c
index a865f23..9dca099 100644 (file)
--- a/arch/mips/mm/tlb-r4k.c
+++ b/arch/mips/mm/tlb-r4k.c
@@ -32,13 +32,35 @@ extern void build_tlb_refill_handler(void);
                                     "nop; nop; nop; nop; nop; nop;\n\t" \
                                     ".set reorder\n\t")
 
+/* Atomicity and interruptability */
+#ifdef CONFIG_MIPS_MT_SMTC
+
+#include <asm/smtc.h>
+#include <asm/mipsmtregs.h>
+
+#define ENTER_CRITICAL(flags) \
+       { \
+       unsigned int mvpflags; \
+       local_irq_save(flags);\
+       mvpflags = dvpe()
+#define EXIT_CRITICAL(flags) \
+       evpe(mvpflags); \
+       local_irq_restore(flags); \
+       }
+#else
+
+#define ENTER_CRITICAL(flags) local_irq_save(flags)
+#define EXIT_CRITICAL(flags) local_irq_restore(flags)
+
+#endif /* CONFIG_MIPS_MT_SMTC */
+
 void local_flush_tlb_all(void)
 {
        unsigned long flags;
        unsigned long old_ctx;
        int entry;
 
-       local_irq_save(flags);
+       ENTER_CRITICAL(flags);
        /* Save old context and create impossible VPN2 value */
        old_ctx = read_c0_entryhi();
        write_c0_entrylo0(0);
@@ -57,7 +79,7 @@ void local_flush_tlb_all(void)
        }
        tlbw_use_hazard();
        write_c0_entryhi(old_ctx);
-       local_irq_restore(flags);
+       EXIT_CRITICAL(flags);
 }
 
 /* All entries common to a mm share an asid.  To effectively flush
@@ -87,6 +109,7 @@ void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
                unsigned long flags;
                int size;
 
+               ENTER_CRITICAL(flags);
                size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
                size = (size + 1) >> 1;
                local_irq_save(flags);
@@ -120,7 +143,7 @@ void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
                } else {
                        drop_mmu_context(mm, cpu);
                }
-               local_irq_restore(flags);
+               EXIT_CRITICAL(flags);
        }
 }
 
@@ -129,9 +152,9 @@ void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
        unsigned long flags;
        int size;
 
+       ENTER_CRITICAL(flags);
        size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
        size = (size + 1) >> 1;
-       local_irq_save(flags);
        if (size <= current_cpu_data.tlbsize / 2) {
                int pid = read_c0_entryhi();
 
@@ -162,7 +185,7 @@ void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
        } else {
                local_flush_tlb_all();
        }
-       local_irq_restore(flags);
+       EXIT_CRITICAL(flags);
 }
 
 void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
@@ -175,7 +198,7 @@ void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
 
                newpid = cpu_asid(cpu, vma->vm_mm);
                page &= (PAGE_MASK << 1);
-               local_irq_save(flags);
+               ENTER_CRITICAL(flags);
                oldpid = read_c0_entryhi();
                write_c0_entryhi(page | newpid);
                mtc0_tlbw_hazard();
@@ -194,7 +217,7 @@ void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
 
        finish:
                write_c0_entryhi(oldpid);
-               local_irq_restore(flags);
+               EXIT_CRITICAL(flags);
        }
 }
 
@@ -207,7 +230,7 @@ void local_flush_tlb_one(unsigned long page)
        unsigned long flags;
        int oldpid, idx;
 
-       local_irq_save(flags);
+       ENTER_CRITICAL(flags);
        oldpid = read_c0_entryhi();
        page &= (PAGE_MASK << 1);
        write_c0_entryhi(page);
@@ -226,7 +249,7 @@ void local_flush_tlb_one(unsigned long page)
        }
        write_c0_entryhi(oldpid);
 
-       local_irq_restore(flags);
+       EXIT_CRITICAL(flags);
 }
 
 /*
@@ -249,7 +272,7 @@ void __update_tlb(struct vm_area_struct * vma, unsigned long address, pte_t pte)
        if (current->active_mm != vma->vm_mm)
                return;
 
-       local_irq_save(flags);
+       ENTER_CRITICAL(flags);
 
        pid = read_c0_entryhi() & ASID_MASK;
        address &= (PAGE_MASK << 1);
@@ -277,7 +300,7 @@ void __update_tlb(struct vm_area_struct * vma, unsigned long address, pte_t pte)
        else
                tlb_write_indexed();
        tlbw_use_hazard();
-       local_irq_restore(flags);
+       EXIT_CRITICAL(flags);
 }
 
 #if 0
@@ -291,7 +314,7 @@ static void r4k_update_mmu_cache_hwbug(struct vm_area_struct * vma,
        pte_t *ptep;
        int idx;
 
-       local_irq_save(flags);
+       ENTER_CRITICAL(flags);
        address &= (PAGE_MASK << 1);
        asid = read_c0_entryhi() & ASID_MASK;
        write_c0_entryhi(address | asid);
@@ -310,7 +333,7 @@ static void r4k_update_mmu_cache_hwbug(struct vm_area_struct * vma,
        else
                tlb_write_indexed();
        tlbw_use_hazard();
-       local_irq_restore(flags);
+       EXIT_CRITICAL(flags);
 }
 #endif
 
@@ -322,7 +345,7 @@ void __init add_wired_entry(unsigned long entrylo0, unsigned long entrylo1,
        unsigned long old_pagemask;
        unsigned long old_ctx;
 
-       local_irq_save(flags);
+       ENTER_CRITICAL(flags);
        /* Save old context and create impossible VPN2 value */
        old_ctx = read_c0_entryhi();
        old_pagemask = read_c0_pagemask();
@@ -342,7 +365,7 @@ void __init add_wired_entry(unsigned long entrylo0, unsigned long entrylo1,
        BARRIER;
        write_c0_pagemask(old_pagemask);
        local_flush_tlb_all();
-       local_irq_restore(flags);
+       EXIT_CRITICAL(flags);
 }
 
 /*
@@ -362,7 +385,7 @@ __init int add_temporary_entry(unsigned long entrylo0, unsigned long entrylo1,
        unsigned long old_pagemask;
        unsigned long old_ctx;
 
-       local_irq_save(flags);
+       ENTER_CRITICAL(flags);
        /* Save old context and create impossible VPN2 value */
        old_ctx = read_c0_entryhi();
        old_pagemask = read_c0_pagemask();
@@ -386,10 +409,11 @@ __init int add_temporary_entry(unsigned long entrylo0, unsigned long entrylo1,
        write_c0_entryhi(old_ctx);
        write_c0_pagemask(old_pagemask);
 out:
-       local_irq_restore(flags);
+       EXIT_CRITICAL(flags);
        return ret;
 }
 
+extern void __init sanitize_tlb_entries(void);
 static void __init probe_tlb(unsigned long config)
 {
        struct cpuinfo_mips *c = &current_cpu_data;
@@ -402,6 +426,14 @@ static void __init probe_tlb(unsigned long config)
         */
        if ((c->processor_id & 0xff0000) == PRID_COMP_LEGACY)
                return;
+#ifdef CONFIG_MIPS_MT_SMTC
+       /*
+        * If TLB is shared in SMTC system, total size already
+        * has been calculated and written into cpu_data tlbsize
+        */
+       if((smtc_status & SMTC_TLB_SHARED) == SMTC_TLB_SHARED)
+               return;
+#endif /* CONFIG_MIPS_MT_SMTC */
 
        reg = read_c0_config1();
        if (!((config >> 7) & 3))
@@ -410,6 +442,15 @@ static void __init probe_tlb(unsigned long config)
        c->tlbsize = ((reg >> 25) & 0x3f) + 1;
 }
 
+static int __initdata ntlb = 0;
+static int __init set_ntlb(char *str)
+{
+       get_option(&str, &ntlb);
+       return 1;
+}
+
+__setup("ntlb=", set_ntlb);
+
 void __init tlb_init(void)
 {
        unsigned int config = read_c0_config();
@@ -432,5 +473,15 @@ void __init tlb_init(void)
 
        /* Did I tell you that ARC SUCKS?  */
 
+       if (ntlb) {
+               if (ntlb > 1 && ntlb <= current_cpu_data.tlbsize) {
+                       int wired = current_cpu_data.tlbsize - ntlb;
+                       write_c0_wired(wired);
+                       write_c0_index(wired-1);
+                       printk ("Restricting TLB to %d entries\n", ntlb);
+               } else
+                       printk("Ignoring invalid argument ntlb=%d\n", ntlb);
+       }
+
        build_tlb_refill_handler();
 }