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2024-05-13 9d77db3c730780c8ef5ccd4b66403ff5675cfe4e 
 kernel/arch/parisc/kernel/cache.c
....@@ -24,31 +24,38 @@
2424 #include <asm/cacheflush.h>
2525 #include <asm/tlbflush.h>
2626 #include <asm/page.h>
27
-#include <asm/pgalloc.h>
2827 #include <asm/processor.h>
2928 #include <asm/sections.h>
3029 #include <asm/shmparam.h>
3130 
32
-int split_tlb __read_mostly;
33
-int dcache_stride __read_mostly;
34
-int icache_stride __read_mostly;
31
+int split_tlb __ro_after_init;
32
+int dcache_stride __ro_after_init;
33
+int icache_stride __ro_after_init;
3534 EXPORT_SYMBOL(dcache_stride);
3635 
3736 void flush_dcache_page_asm(unsigned long phys_addr, unsigned long vaddr);
3837 EXPORT_SYMBOL(flush_dcache_page_asm);
38
+void purge_dcache_page_asm(unsigned long phys_addr, unsigned long vaddr);
3939 void flush_icache_page_asm(unsigned long phys_addr, unsigned long vaddr);
4040 
4141 
42
-/* On some machines (e.g. ones with the Merced bus), there can be
42
+/* On some machines (i.e., ones with the Merced bus), there can be
4343  * only a single PxTLB broadcast at a time; this must be guaranteed
44
- * by software.  We put a spinlock around all TLB flushes  to
45
- * ensure this.
44
+ * by software. We need a spinlock around all TLB flushes to ensure
45
+ * this.
4646  */
47
-DEFINE_SPINLOCK(pa_tlb_lock);
47
+DEFINE_SPINLOCK(pa_tlb_flush_lock);
4848 
49
-struct pdc_cache_info cache_info __read_mostly;
49
+/* Swapper page setup lock. */
50
+DEFINE_SPINLOCK(pa_swapper_pg_lock);
51
+
52
+#if defined(CONFIG_64BIT) && defined(CONFIG_SMP)
53
+int pa_serialize_tlb_flushes __ro_after_init;
54
+#endif
55
+
56
+struct pdc_cache_info cache_info __ro_after_init;
5057 #ifndef CONFIG_PA20
51
-static struct pdc_btlb_info btlb_info __read_mostly;
58
+static struct pdc_btlb_info btlb_info __ro_after_init;
5259 #endif
5360 
5461 #ifdef CONFIG_SMP
....@@ -76,9 +83,9 @@
7683 #define pfn_va(pfn)	__va(PFN_PHYS(pfn))
7784 
7885 void
79
-update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep)
86
+__update_cache(pte_t pte)
8087 {
81
-	unsigned long pfn = pte_pfn(*ptep);
88
+	unsigned long pfn = pte_pfn(pte);
8289 	struct page *page;
8390 
8491 	/* We don't have pte special.  As a result, we can be called with
....@@ -303,12 +310,24 @@
303310 	preempt_enable();
304311 }
305312 
313
+static inline void
314
+__purge_cache_page(struct vm_area_struct *vma, unsigned long vmaddr,
315
+		   unsigned long physaddr)
316
+{
317
+	preempt_disable();
318
+	purge_dcache_page_asm(physaddr, vmaddr);
319
+	if (vma->vm_flags & VM_EXEC)
320
+		flush_icache_page_asm(physaddr, vmaddr);
321
+	preempt_enable();
322
+}
323
+
306324 void flush_dcache_page(struct page *page)
307325 {
308326 	struct address_space *mapping = page_mapping_file(page);
309327 	struct vm_area_struct *mpnt;
310328 	unsigned long offset;
311329 	unsigned long addr, old_addr = 0;
330
+	unsigned long flags;
312331 	pgoff_t pgoff;
313332 
314333 	if (mapping && !mapping_mapped(mapping)) {
....@@ -328,7 +347,7 @@
328347 	 * declared as MAP_PRIVATE or MAP_SHARED), so we only need
329348 	 * to flush one address here for them all to become coherent */
330349 
331
-	flush_dcache_mmap_lock(mapping);
350
+	flush_dcache_mmap_lock_irqsave(mapping, flags);
332351 	vma_interval_tree_foreach(mpnt, &mapping->i_mmap, pgoff, pgoff) {
333352 		offset = (pgoff - mpnt->vm_pgoff) << PAGE_SHIFT;
334353 		addr = mpnt->vm_start + offset;
....@@ -346,12 +365,12 @@
346365 		if (old_addr == 0 || (old_addr & (SHM_COLOUR - 1))
347366 				      != (addr & (SHM_COLOUR - 1))) {
348367 			__flush_cache_page(mpnt, addr, page_to_phys(page));
349
-			if (old_addr)
368
+			if (parisc_requires_coherency() && old_addr)
350369 				printk(KERN_ERR "INEQUIVALENT ALIASES 0x%lx and 0x%lx in file %pD\n", old_addr, addr, mpnt->vm_file);
351370 			old_addr = addr;
352371 		}
353372 	}
354
-	flush_dcache_mmap_unlock(mapping);
373
+	flush_dcache_mmap_unlock_irqrestore(mapping, flags);
355374 }
356375 EXPORT_SYMBOL(flush_dcache_page);
357376 
....@@ -362,15 +381,15 @@
362381 EXPORT_SYMBOL(flush_kernel_icache_range_asm);
363382 
364383 #define FLUSH_THRESHOLD 0x80000 /* 0.5MB */
365
-static unsigned long parisc_cache_flush_threshold __read_mostly = FLUSH_THRESHOLD;
384
+static unsigned long parisc_cache_flush_threshold __ro_after_init = FLUSH_THRESHOLD;
366385 
367
-#define FLUSH_TLB_THRESHOLD (2*1024*1024) /* 2MB initial TLB threshold */
368
-static unsigned long parisc_tlb_flush_threshold __read_mostly = FLUSH_TLB_THRESHOLD;
386
+#define FLUSH_TLB_THRESHOLD (16*1024) /* 16 KiB minimum TLB threshold */
387
+static unsigned long parisc_tlb_flush_threshold __ro_after_init = ~0UL;
369388 
370389 void __init parisc_setup_cache_timing(void)
371390 {
372391 	unsigned long rangetime, alltime;
373
-	unsigned long size, start;
392
+	unsigned long size;
374393 	unsigned long threshold;
375394 
376395 	alltime = mfctl(16);
....@@ -404,28 +423,28 @@
404423 		goto set_tlb_threshold;
405424 	}
406425 
426
+	size = (unsigned long)_end - (unsigned long)_text;
427
+	rangetime = mfctl(16);
428
+	flush_tlb_kernel_range((unsigned long)_text, (unsigned long)_end);
429
+	rangetime = mfctl(16) - rangetime;
430
+
407431 	alltime = mfctl(16);
408432 	flush_tlb_all();
409433 	alltime = mfctl(16) - alltime;
410434 
411
-	size = 0;
412
-	start = (unsigned long) _text;
413
-	rangetime = mfctl(16);
414
-	while (start < (unsigned long) _end) {
415
-		flush_tlb_kernel_range(start, start + PAGE_SIZE);
416
-		start += PAGE_SIZE;
417
-		size += PAGE_SIZE;
418
-	}
419
-	rangetime = mfctl(16) - rangetime;
420
-
421
-	printk(KERN_DEBUG "Whole TLB flush %lu cycles, flushing %lu bytes %lu cycles\n",
435
+	printk(KERN_INFO "Whole TLB flush %lu cycles, Range flush %lu bytes %lu cycles\n",
422436 		alltime, size, rangetime);
423437 
424
-	threshold = PAGE_ALIGN(num_online_cpus() * size * alltime / rangetime);
438
+	threshold = PAGE_ALIGN((num_online_cpus() * size * alltime) / rangetime);
439
+	printk(KERN_INFO "Calculated TLB flush threshold %lu KiB\n",
440
+		threshold/1024);
425441 
426442 set_tlb_threshold:
427
-	if (threshold)
443
+	if (threshold > FLUSH_TLB_THRESHOLD)
428444 		parisc_tlb_flush_threshold = threshold;
445
+	else
446
+		parisc_tlb_flush_threshold = FLUSH_TLB_THRESHOLD;
447
+
429448 	printk(KERN_INFO "TLB flush threshold set to %lu KiB\n",
430449 		parisc_tlb_flush_threshold/1024);
431450 }
....@@ -477,18 +496,6 @@
477496 	/* Purge TLB entries for small ranges using the pdtlb and
478497 	   pitlb instructions.  These instructions execute locally
479498 	   but cause a purge request to be broadcast to other TLBs.  */
480
-	if (likely(!split_tlb)) {
481
-		while (start < end) {
482
-			purge_tlb_start(flags);
483
-			mtsp(sid, 1);
484
-			pdtlb(start);
485
-			purge_tlb_end(flags);
486
-			start += PAGE_SIZE;
487
-		}
488
-		return 0;
489
-	}
490
-
491
-	/* split TLB case */
492499 	while (start < end) {
493500 		purge_tlb_start(flags);
494501 		mtsp(sid, 1);
....@@ -525,11 +532,14 @@
525532 	pte_t *ptep = NULL;
526533 
527534 	if (!pgd_none(*pgd)) {
528
-		pud_t *pud = pud_offset(pgd, addr);
529
-		if (!pud_none(*pud)) {
530
-			pmd_t *pmd = pmd_offset(pud, addr);
531
-			if (!pmd_none(*pmd))
532
-				ptep = pte_offset_map(pmd, addr);
535
+		p4d_t *p4d = p4d_offset(pgd, addr);
536
+		if (!p4d_none(*p4d)) {
537
+			pud_t *pud = pud_offset(p4d, addr);
538
+			if (!pud_none(*pud)) {
539
+				pmd_t *pmd = pmd_offset(pud, addr);
540
+				if (!pmd_none(*pmd))
541
+					ptep = pte_offset_map(pmd, addr);
542
+			}
533543 		}
534544 	}
535545 	return ptep;
....@@ -573,9 +583,12 @@
573583 			pfn = pte_pfn(*ptep);
574584 			if (!pfn_valid(pfn))
575585 				continue;
576
-			if (unlikely(mm->context))
586
+			if (unlikely(mm->context)) {
577587 				flush_tlb_page(vma, addr);
578
-			__flush_cache_page(vma, addr, PFN_PHYS(pfn));
588
+				__flush_cache_page(vma, addr, PFN_PHYS(pfn));
589
+			} else {
590
+				__purge_cache_page(vma, addr, PFN_PHYS(pfn));
591
+			}
579592 		}
580593 	}
581594 }
....@@ -610,9 +623,12 @@
610623 			continue;
611624 		pfn = pte_pfn(*ptep);
612625 		if (pfn_valid(pfn)) {
613
-			if (unlikely(vma->vm_mm->context))
626
+			if (unlikely(vma->vm_mm->context)) {
614627 				flush_tlb_page(vma, addr);
615
-			__flush_cache_page(vma, addr, PFN_PHYS(pfn));
628
+				__flush_cache_page(vma, addr, PFN_PHYS(pfn));
629
+			} else {
630
+				__purge_cache_page(vma, addr, PFN_PHYS(pfn));
631
+			}
616632 		}
617633 	}
618634 }
....@@ -621,9 +637,12 @@
621637 flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, unsigned long pfn)
622638 {
623639 	if (pfn_valid(pfn)) {
624
-		if (likely(vma->vm_mm->context))
640
+		if (likely(vma->vm_mm->context)) {
625641 			flush_tlb_page(vma, vmaddr);
626
-		__flush_cache_page(vma, vmaddr, PFN_PHYS(pfn));
642
+			__flush_cache_page(vma, vmaddr, PFN_PHYS(pfn));
643
+		} else {
644
+			__purge_cache_page(vma, vmaddr, PFN_PHYS(pfn));
645
+		}
627646 	}
628647 }
629648