From 8199daf9ed11c869b2e29b3008df3f63462b8c30 Mon Sep 17 00:00:00 2001
From: Mark Johnston <mark.johnston@klarasystems.com>
Date: Fri, 27 Jan 2023 16:53:06 -0500
Subject: [PATCH 41/52] mips: Add some debug prints to the pmap code

---
 sys/mips/mips/pmap_mips64.c | 29 ++++++++++++++++++++++-------
 1 file changed, 22 insertions(+), 7 deletions(-)

diff --git a/sys/mips/mips/pmap_mips64.c b/sys/mips/mips/pmap_mips64.c
index 6fed0e9260aa..e694904ed159 100644
--- a/sys/mips/mips/pmap_mips64.c
+++ b/sys/mips/mips/pmap_mips64.c
@@ -1473,6 +1473,7 @@ retry:
 	 */
 	if (pd != NULL && (pde_is_1m_superpage(pd) &&
 	    pte_is_valid((pt_entry_t *)pd))) {
+		printf("%s:%d va %#lx\n", __func__, __LINE__, va);
 		 if (!pmap_demote_pde_locked(pmap, pd, va, lockp != NULL ? lockp : &local_lock)) {
 			 /*
 			  * Invalidation of the 2MB page mapping may have caused
@@ -2595,6 +2596,7 @@ pmap_remove(pmap_t pmap, vm_offset_t sva, vm_offset_t eva)
 				continue;
 			} else if (!pmap_demote_pde_locked(pmap, pde, sva,
 			    &lock)) {
+				printf("%s:%d va %#lx\n", __func__, __LINE__, sva);
 				/* The superpage mapping was destroyed. */
 				continue;
 			} else {
@@ -2678,6 +2680,7 @@ pmap_remove_all(vm_page_t m)
 		PMAP_LOCK(pmap);
 		va = pv->pv_va;
 		pde = pmap_pde(pmap, va);
+		printf("%s:%d va %#lx\n", __func__, __LINE__, va);
 		(void)pmap_demote_pde(pmap, pde, va);
 		PMAP_UNLOCK(pmap);
 	}
@@ -2844,6 +2847,7 @@ resume:
 						goto resume;
 					}
 				}
+				printf("%s:%d va %#lx\n", __func__, __LINE__, sva);
 				if (!pmap_demote_pde(pmap, pde, sva)) {
 					/*
 					 * The superpage mapping was destroyed.
@@ -3166,6 +3170,7 @@ pmap_enter(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot,
 	if (psind == 1) {
 		KASSERT((va & PDRMASK) == 0, ("pmap_enter: va unaligned"));
 		KASSERT(m->psind > 0, ("pmap_enter: m->psind < psind"));
+		printf("%s:%d va %#lx prot %x flags %x\n", __func__, __LINE__, va, prot, flags);
 		rv = pmap_enter_pde(pmap, va, m, prot, flags, &lock);
 		goto out;
 	}
@@ -3738,12 +3743,16 @@ pmap_enter_object(pmap_t pmap, vm_offset_t start, vm_offset_t end,
 	while (m != NULL && (diff = m->pindex - m_start->pindex) < psize) {
 		va = start + ptoa(diff);
 		if ((va & PDRMASK) == 0 && va + NBPDR <= end &&
-		    m->psind == 1 && pg_ps_enabled &&
-		    pmap_enter_pde(pmap, va, m, prot & ~VM_PROT_WRITE,
-		    PMAP_ENTER_NOSLEEP | PMAP_ENTER_NORECLAIM, &lock) ==
-		    KERN_SUCCESS)
-			m = &m[NBPDR / PAGE_SIZE - 1];
-		else
+		    m->psind == 1 && pg_ps_enabled) {
+			printf("%s:%d va %#lx prot %x\n", __func__, __LINE__, va, prot);
+			if (pmap_enter_pde(pmap, va, m, prot & ~VM_PROT_WRITE,
+			    PMAP_ENTER_NOSLEEP | PMAP_ENTER_NORECLAIM, &lock) ==
+			    KERN_SUCCESS)
+				m = &m[NBPDR / PAGE_SIZE - 1];
+			else
+				mpte = pmap_enter_quick_locked(pmap, va, m, prot,
+				    mpte, &lock);
+		} else
 			mpte = pmap_enter_quick_locked(pmap, va, m, prot,
 			    mpte, &lock);
 		m = TAILQ_NEXT(m, listq);
@@ -3921,6 +3930,7 @@ resume:
 						 goto resume;
 					}
 				}
+				printf("%s:%d va %#lx\n", __func__, __LINE__, sva);
 				if (!pmap_demote_pde(pmap, pde, sva))
 					panic("pmap_unwire: demotion failed");
 			}
@@ -4761,8 +4771,10 @@ retry_pv_loop:
 		}
 		va = pv->pv_va;
 		pde = pmap_pde(pmap, va);
-		if (pde_is_1m_superpage(pde) && !pde_test(pde, PTE_RO))
+		if (pde_is_1m_superpage(pde) && !pde_test(pde, PTE_RO)) {
+			printf("%s:%d va %#lx\n", __func__, __LINE__, va);
 			(void)pmap_demote_pde_locked(pmap, pde, va, &lock);
+		}
 		KASSERT(lock == VM_PAGE_TO_PV_LIST_LOCK(m),
 		    ("inconsistent pv lock %p %p for page %p",
 		    lock, VM_PAGE_TO_PV_LIST_LOCK(m), m));
@@ -4887,6 +4899,7 @@ retry:
 			if ((((pa >> PAGE_SHIFT) ^ (pv->pv_va >> PDRSHIFT) ^
 			    (uintptr_t)pmap) & (NPTEPG - 1)) == 0 &&
 			    !pde_test(pde, PTE_W)) {
+				printf("%s:%d va %#lx\n", __func__, __LINE__, pv->pv_va);
 				atomic_clear_long((pt_entry_t *)pde, PTE_REF);
 				pmap_invalidate_page(pmap, pv->pv_va);
 				cleared++;
@@ -5147,6 +5160,7 @@ resume:
 				}
 			}
 			lock = NULL;
+			printf("%s:%d va %#lx\n", __func__, __LINE__, sva);
 			if (!pmap_demote_pde_locked(pmap, pde, sva, &lock)) {
 				if (lock != NULL)
 					rw_wunlock(lock);
@@ -5270,6 +5284,7 @@ restart:
 		pde = pmap_pde(pmap, va);
 		oldpde = *pde;
 		if (!pde_test(pde, PTE_RO)) {
+			printf("%s:%d va %#lx\n", __func__, __LINE__, va);
 			if (pmap_demote_pde_locked(pmap, pde, va, &lock)) {
 				if (!pde_test(&oldpde, PTE_W)) {
 					/*
-- 
2.41.0