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-rw-r--r--arch/sparc64/kernel/smp.c28
-rw-r--r--arch/sparc64/mm/init.c7
-rw-r--r--arch/sparc64/mm/tsb.c151
3 files changed, 176 insertions, 10 deletions
diff --git a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c
index 8c245859d212..3c14b549cf91 100644
--- a/arch/sparc64/kernel/smp.c
+++ b/arch/sparc64/kernel/smp.c
@@ -581,11 +581,11 @@ extern unsigned long xcall_call_function;
* You must not call this function with disabled interrupts or from a
* hardware interrupt handler or from a bottom half handler.
*/
-int smp_call_function(void (*func)(void *info), void *info,
- int nonatomic, int wait)
+static int smp_call_function_mask(void (*func)(void *info), void *info,
+ int nonatomic, int wait, cpumask_t mask)
{
struct call_data_struct data;
- int cpus = num_online_cpus() - 1;
+ int cpus = cpus_weight(mask) - 1;
long timeout;
if (!cpus)
@@ -603,7 +603,7 @@ int smp_call_function(void (*func)(void *info), void *info,
call_data = &data;
- smp_cross_call(&xcall_call_function, 0, 0, 0);
+ smp_cross_call_masked(&xcall_call_function, 0, 0, 0, mask);
/*
* Wait for other cpus to complete function or at
@@ -629,6 +629,13 @@ out_timeout:
return 0;
}
+int smp_call_function(void (*func)(void *info), void *info,
+ int nonatomic, int wait)
+{
+ return smp_call_function_mask(func, info, nonatomic, wait,
+ cpu_online_map);
+}
+
void smp_call_function_client(int irq, struct pt_regs *regs)
{
void (*func) (void *info) = call_data->func;
@@ -646,6 +653,19 @@ void smp_call_function_client(int irq, struct pt_regs *regs)
}
}
+static void tsb_sync(void *info)
+{
+ struct mm_struct *mm = info;
+
+ if (current->active_mm == mm)
+ tsb_context_switch(mm);
+}
+
+void smp_tsb_sync(struct mm_struct *mm)
+{
+ smp_call_function_mask(tsb_sync, mm, 0, 1, mm->cpu_vm_mask);
+}
+
extern unsigned long xcall_flush_tlb_mm;
extern unsigned long xcall_flush_tlb_pending;
extern unsigned long xcall_flush_tlb_kernel_range;
diff --git a/arch/sparc64/mm/init.c b/arch/sparc64/mm/init.c
index 7c456afaa9a5..a8119cb4fa32 100644
--- a/arch/sparc64/mm/init.c
+++ b/arch/sparc64/mm/init.c
@@ -246,9 +246,11 @@ static __inline__ void clear_dcache_dirty_cpu(struct page *page, unsigned long c
void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte)
{
+ struct mm_struct *mm;
struct page *page;
unsigned long pfn;
unsigned long pg_flags;
+ unsigned long mm_rss;
pfn = pte_pfn(pte);
if (pfn_valid(pfn) &&
@@ -270,6 +272,11 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t p
put_cpu();
}
+
+ mm = vma->vm_mm;
+ mm_rss = get_mm_rss(mm);
+ if (mm_rss >= mm->context.tsb_rss_limit)
+ tsb_grow(mm, mm_rss, GFP_ATOMIC);
}
void flush_dcache_page(struct page *page)
diff --git a/arch/sparc64/mm/tsb.c b/arch/sparc64/mm/tsb.c
index dfe7144fcdf6..707af4b84a0e 100644
--- a/arch/sparc64/mm/tsb.c
+++ b/arch/sparc64/mm/tsb.c
@@ -10,6 +10,7 @@
#include <asm/tlb.h>
#include <asm/mmu_context.h>
#include <asm/pgtable.h>
+#include <asm/tsb.h>
/* We use an 8K TSB for the whole kernel, this allows to
* handle about 4MB of modules and vmalloc mappings without
@@ -146,6 +147,9 @@ static void setup_tsb_params(struct mm_struct *mm, unsigned long tsb_bytes)
tte |= _PAGE_SZ4MB;
page_sz = 4 * 1024 * 1024;
break;
+
+ default:
+ BUG();
};
tsb_reg |= base;
@@ -157,23 +161,158 @@ static void setup_tsb_params(struct mm_struct *mm, unsigned long tsb_bytes)
mm->context.tsb_map_pte = tte;
}
+/* The page tables are locked against modifications while this
+ * runs.
+ *
+ * XXX do some prefetching...
+ */
+static void copy_tsb(struct tsb *old_tsb, unsigned long old_size,
+ struct tsb *new_tsb, unsigned long new_size)
+{
+ unsigned long old_nentries = old_size / sizeof(struct tsb);
+ unsigned long new_nentries = new_size / sizeof(struct tsb);
+ unsigned long i;
+
+ for (i = 0; i < old_nentries; i++) {
+ register unsigned long tag asm("o4");
+ register unsigned long pte asm("o5");
+ unsigned long v;
+ unsigned int hash;
+
+ __asm__ __volatile__(
+ "ldda [%2] %3, %0"
+ : "=r" (tag), "=r" (pte)
+ : "r" (&old_tsb[i]), "i" (ASI_NUCLEUS_QUAD_LDD));
+
+ if (!tag || (tag & TSB_TAG_LOCK))
+ continue;
+
+ /* We only put base page size PTEs into the TSB,
+ * but that might change in the future. This code
+ * would need to be changed if we start putting larger
+ * page size PTEs into there.
+ */
+ WARN_ON((pte & _PAGE_ALL_SZ_BITS) != _PAGE_SZBITS);
+
+ /* The tag holds bits 22 to 63 of the virtual address
+ * and the context. Clear out the context, and shift
+ * up to make a virtual address.
+ */
+ v = (tag & ((1UL << 42UL) - 1UL)) << 22UL;
+
+ /* The implied bits of the tag (bits 13 to 21) are
+ * determined by the TSB entry index, so fill that in.
+ */
+ v |= (i & (512UL - 1UL)) << 13UL;
+
+ hash = tsb_hash(v, new_nentries);
+ new_tsb[hash].tag = tag;
+ new_tsb[hash].pte = pte;
+ }
+}
+
+/* When the RSS of an address space exceeds mm->context.tsb_rss_limit,
+ * update_mmu_cache() invokes this routine to try and grow the TSB.
+ * When we reach the maximum TSB size supported, we stick ~0UL into
+ * mm->context.tsb_rss_limit so the grow checks in update_mmu_cache()
+ * will not trigger any longer.
+ *
+ * The TSB can be anywhere from 8K to 1MB in size, in increasing powers
+ * of two. The TSB must be aligned to it's size, so f.e. a 512K TSB
+ * must be 512K aligned.
+ *
+ * The idea here is to grow the TSB when the RSS of the process approaches
+ * the number of entries that the current TSB can hold at once. Currently,
+ * we trigger when the RSS hits 3/4 of the TSB capacity.
+ */
+void tsb_grow(struct mm_struct *mm, unsigned long rss, gfp_t gfp_flags)
+{
+ unsigned long max_tsb_size = 1 * 1024 * 1024;
+ unsigned long size, old_size;
+ struct page *page;
+ struct tsb *old_tsb;
+
+ if (max_tsb_size > (PAGE_SIZE << MAX_ORDER))
+ max_tsb_size = (PAGE_SIZE << MAX_ORDER);
+
+ for (size = PAGE_SIZE; size < max_tsb_size; size <<= 1UL) {
+ unsigned long n_entries = size / sizeof(struct tsb);
+
+ n_entries = (n_entries * 3) / 4;
+ if (n_entries > rss)
+ break;
+ }
+
+ page = alloc_pages(gfp_flags | __GFP_ZERO, get_order(size));
+ if (unlikely(!page))
+ return;
+
+ if (size == max_tsb_size)
+ mm->context.tsb_rss_limit = ~0UL;
+ else
+ mm->context.tsb_rss_limit =
+ ((size / sizeof(struct tsb)) * 3) / 4;
+
+ old_tsb = mm->context.tsb;
+ old_size = mm->context.tsb_nentries * sizeof(struct tsb);
+
+ if (old_tsb)
+ copy_tsb(old_tsb, old_size, page_address(page), size);
+
+ mm->context.tsb = page_address(page);
+ setup_tsb_params(mm, size);
+
+ /* If old_tsb is NULL, we're being invoked for the first time
+ * from init_new_context().
+ */
+ if (old_tsb) {
+ /* Now force all other processors to reload the new
+ * TSB state.
+ */
+ smp_tsb_sync(mm);
+
+ /* Finally reload it on the local cpu. No further
+ * references will remain to the old TSB and we can
+ * thus free it up.
+ */
+ tsb_context_switch(mm);
+
+ free_pages((unsigned long) old_tsb, get_order(old_size));
+ }
+}
+
int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
- unsigned long page = get_zeroed_page(GFP_KERNEL);
+ unsigned long initial_rss;
mm->context.sparc64_ctx_val = 0UL;
- if (unlikely(!page))
- return -ENOMEM;
- mm->context.tsb = (struct tsb *) page;
- setup_tsb_params(mm, PAGE_SIZE);
+ /* copy_mm() copies over the parent's mm_struct before calling
+ * us, so we need to zero out the TSB pointer or else tsb_grow()
+ * will be confused and think there is an older TSB to free up.
+ */
+ mm->context.tsb = NULL;
+
+ /* If this is fork, inherit the parent's TSB size. We would
+ * grow it to that size on the first page fault anyways.
+ */
+ initial_rss = mm->context.tsb_nentries;
+ if (initial_rss)
+ initial_rss -= 1;
+
+ tsb_grow(mm, initial_rss, GFP_KERNEL);
+
+ if (unlikely(!mm->context.tsb))
+ return -ENOMEM;
return 0;
}
void destroy_context(struct mm_struct *mm)
{
- free_page((unsigned long) mm->context.tsb);
+ unsigned long size = mm->context.tsb_nentries * sizeof(struct tsb);
+
+ free_pages((unsigned long) mm->context.tsb, get_order(size));
/* We can remove these later, but for now it's useful
* to catch any bogus post-destroy_context() references
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-14 19:30:09 +0000