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authorRalf Baechle <ralf@linux-mips.org>2014-05-23 16:29:44 +0200
committerRalf Baechle <ralf@linux-mips.org>2014-05-24 00:07:01 +0200
commitb633648c5ad3cfbda0b3daea50d2135d44899259 (patch)
tree6100185cae10f36a55e71c3b220fc79cfa14b7c0 /arch/mips/mm/init.c
parent8b2e62cc34feaaf1cac9440a93fb18ac0b1e81bc (diff)
MIPS: MT: Remove SMTC support
Nobody is maintaining SMTC anymore and there also seems to be no userbase. Which is a pity - the SMTC technology primarily developed by Kevin D. Kissell <kevink@paralogos.com> is an ingenious demonstration for the MT ASE's power and elegance. Based on Markos Chandras <Markos.Chandras@imgtec.com> patch https://patchwork.linux-mips.org/patch/6719/ which while very similar did no longer apply cleanly when I tried to merge it plus some additional post-SMTC cleanup - SMTC was a feature as tricky to remove as it was to merge once upon a time. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/mm/init.c')
-rw-r--r--arch/mips/mm/init.c68
1 files changed, 5 insertions, 63 deletions
diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c
index 4fc74c78265a..609a0cd749ff 100644
--- a/arch/mips/mm/init.c
+++ b/arch/mips/mm/init.c
@@ -44,27 +44,6 @@
#include <asm/tlb.h>
#include <asm/fixmap.h>
-/* Atomicity and interruptability */
-#ifdef CONFIG_MIPS_MT_SMTC
-
-#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 */
-
/*
* We have up to 8 empty zeroed pages so we can map one of the right colour
* when needed. This is necessary only on R4000 / R4400 SC and MC versions
@@ -100,20 +79,6 @@ void setup_zero_pages(void)
zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
}
-#ifdef CONFIG_MIPS_MT_SMTC
-static pte_t *kmap_coherent_pte;
-static void __init kmap_coherent_init(void)
-{
- unsigned long vaddr;
-
- /* cache the first coherent kmap pte */
- vaddr = __fix_to_virt(FIX_CMAP_BEGIN);
- kmap_coherent_pte = kmap_get_fixmap_pte(vaddr);
-}
-#else
-static inline void kmap_coherent_init(void) {}
-#endif
-
void *kmap_coherent(struct page *page, unsigned long addr)
{
enum fixed_addresses idx;
@@ -126,12 +91,7 @@ void *kmap_coherent(struct page *page, unsigned long addr)
pagefault_disable();
idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1);
-#ifdef CONFIG_MIPS_MT_SMTC
- idx += FIX_N_COLOURS * smp_processor_id() +
- (in_interrupt() ? (FIX_N_COLOURS * NR_CPUS) : 0);
-#else
idx += in_interrupt() ? FIX_N_COLOURS : 0;
-#endif
vaddr = __fix_to_virt(FIX_CMAP_END - idx);
pte = mk_pte(page, PAGE_KERNEL);
#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
@@ -140,44 +100,29 @@ void *kmap_coherent(struct page *page, unsigned long addr)
entrylo = pte_to_entrylo(pte_val(pte));
#endif
- ENTER_CRITICAL(flags);
+ local_irq_save(flags);
old_ctx = read_c0_entryhi();
write_c0_entryhi(vaddr & (PAGE_MASK << 1));
write_c0_entrylo0(entrylo);
write_c0_entrylo1(entrylo);
-#ifdef CONFIG_MIPS_MT_SMTC
- set_pte(kmap_coherent_pte - (FIX_CMAP_END - idx), pte);
- /* preload TLB instead of local_flush_tlb_one() */
- mtc0_tlbw_hazard();
- tlb_probe();
- tlb_probe_hazard();
- tlbidx = read_c0_index();
- mtc0_tlbw_hazard();
- if (tlbidx < 0)
- tlb_write_random();
- else
- tlb_write_indexed();
-#else
tlbidx = read_c0_wired();
write_c0_wired(tlbidx + 1);
write_c0_index(tlbidx);
mtc0_tlbw_hazard();
tlb_write_indexed();
-#endif
tlbw_use_hazard();
write_c0_entryhi(old_ctx);
- EXIT_CRITICAL(flags);
+ local_irq_restore(flags);
return (void*) vaddr;
}
void kunmap_coherent(void)
{
-#ifndef CONFIG_MIPS_MT_SMTC
unsigned int wired;
unsigned long flags, old_ctx;
- ENTER_CRITICAL(flags);
+ local_irq_save(flags);
old_ctx = read_c0_entryhi();
wired = read_c0_wired() - 1;
write_c0_wired(wired);
@@ -189,8 +134,7 @@ void kunmap_coherent(void)
tlb_write_indexed();
tlbw_use_hazard();
write_c0_entryhi(old_ctx);
- EXIT_CRITICAL(flags);
-#endif
+ local_irq_restore(flags);
pagefault_enable();
}
@@ -256,7 +200,7 @@ EXPORT_SYMBOL_GPL(copy_from_user_page);
void __init fixrange_init(unsigned long start, unsigned long end,
pgd_t *pgd_base)
{
-#if defined(CONFIG_HIGHMEM) || defined(CONFIG_MIPS_MT_SMTC)
+#ifdef CONFIG_HIGHMEM
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
@@ -327,8 +271,6 @@ void __init paging_init(void)
#ifdef CONFIG_HIGHMEM
kmap_init();
#endif
- kmap_coherent_init();
-
#ifdef CONFIG_ZONE_DMA
max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
#endif