[src/trunk]: src/sys/external/bsd/drm2/linux sdt dtrace probes for linux kmap.

[riastradh <riastradh%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/eb8592ef898b
branches:  trunk
changeset: 364841:eb8592ef898b
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Mon Aug 27 15:07:11 2018 +0000

description:
sdt dtrace probes for linux kmap.

diffstat:

 sys/external/bsd/drm2/linux/linux_kmap.c |  44 ++++++++++++++++++++-----------
 1 files changed, 28 insertions(+), 16 deletions(-)

diffs (140 lines):

diff -r 2f7c41465632 -r eb8592ef898b sys/external/bsd/drm2/linux/linux_kmap.c
--- a/sys/external/bsd/drm2/linux/linux_kmap.c  Mon Aug 27 15:06:54 2018 +0000
+++ b/sys/external/bsd/drm2/linux/linux_kmap.c  Mon Aug 27 15:07:11 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: linux_kmap.c,v 1.12 2015/01/01 01:15:43 mrg Exp $      */
+/*     $NetBSD: linux_kmap.c,v 1.13 2018/08/27 15:07:11 riastradh Exp $        */
 
 /*-
  * Copyright (c) 2013 The NetBSD Foundation, Inc.
@@ -30,12 +30,13 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: linux_kmap.c,v 1.12 2015/01/01 01:15:43 mrg Exp $");
+__KERNEL_RCSID(0, "$NetBSD: linux_kmap.c,v 1.13 2018/08/27 15:07:11 riastradh Exp $");
 
 #include <sys/types.h>
 #include <sys/kmem.h>
 #include <sys/mutex.h>
 #include <sys/rbtree.h>
+#include <sys/sdt.h>
 
 #ifdef __HAVE_MM_MD_DIRECT_MAPPED_PHYS
 #include <dev/mm.h>
@@ -45,6 +46,15 @@
 
 #include <linux/highmem.h>
 
+SDT_PROBE_DEFINE2(sdt, linux, kmap, map,
+    "paddr_t"/*paddr*/, "vaddr_t"/*vaddr*/);
+SDT_PROBE_DEFINE2(sdt, linux, kmap, unmap,
+    "paddr_t"/*paddr*/, "vaddr_t"/*vaddr*/);
+SDT_PROBE_DEFINE2(sdt, linux, kmap, map__atomic,
+    "paddr_t"/*paddr*/, "vaddr_t"/*vaddr*/);
+SDT_PROBE_DEFINE2(sdt, linux, kmap, unmap__atomic,
+    "paddr_t"/*paddr*/, "vaddr_t"/*vaddr*/);
+
 /*
  * XXX Kludgerific implementation of Linux kmap_atomic, which is
  * required not to fail.  To accomodate this, we reserve one page of
@@ -146,7 +156,7 @@
 
 #ifdef __HAVE_MM_MD_DIRECT_MAPPED_PHYS
        if (mm_md_direct_mapped_phys(paddr, &vaddr))
-               return (void *)vaddr;
+               goto out;
 #endif
 
        mutex_spin_enter(&linux_kmap_atomic_lock);
@@ -156,6 +166,7 @@
        pmap_kenter_pa(vaddr, paddr, (VM_PROT_READ | VM_PROT_WRITE), 0);
        pmap_update(pmap_kernel());
 
+out:   SDT_PROBE2(sdt, linux, kmap, map__atomic,  paddr, vaddr);
        return (void *)vaddr;
 }
 
@@ -163,15 +174,17 @@
 kunmap_atomic(void *addr)
 {
        const vaddr_t vaddr = (vaddr_t)addr;
-
-#ifdef __HAVE_MM_MD_DIRECT_MAPPED_PHYS
-    {
        paddr_t paddr;
-       vaddr_t vaddr1;
        bool ok __diagused;
 
        ok = pmap_extract(pmap_kernel(), vaddr, &paddr);
        KASSERT(ok);
+
+       SDT_PROBE2(sdt, linux, kmap, unmap__atomic,  paddr, vaddr);
+
+#ifdef __HAVE_MM_MD_DIRECT_MAPPED_PHYS
+    {
+       vaddr_t vaddr1;
        if (mm_md_direct_mapped_phys(paddr, &vaddr1) && vaddr1 == vaddr)
                return;
     }
@@ -179,7 +192,6 @@
 
        KASSERT(mutex_owned(&linux_kmap_atomic_lock));
        KASSERT(linux_kmap_atomic_vaddr == vaddr);
-       KASSERT(pmap_extract(pmap_kernel(), vaddr, NULL));
 
        pmap_kremove(vaddr, PAGE_SIZE);
        pmap_update(pmap_kernel());
@@ -197,7 +209,7 @@
 
 #ifdef __HAVE_MM_MD_DIRECT_MAPPED_PHYS
        if (mm_md_direct_mapped_phys(paddr, &vaddr))
-               return (void *)vaddr;
+               goto out;
 #endif
 
        vaddr = uvm_km_alloc(kernel_map, PAGE_SIZE, 0,
@@ -219,6 +231,7 @@
        pmap_kenter_pa(vaddr, paddr, (VM_PROT_READ | VM_PROT_WRITE), 0);
        pmap_update(pmap_kernel());
 
+out:   SDT_PROBE2(sdt, linux, kmap, map,  paddr, vaddr);
        return (void *)vaddr;
 }
 
@@ -226,16 +239,13 @@
 kunmap(struct page *page)
 {
        const paddr_t paddr = VM_PAGE_TO_PHYS(&page->p_vmp);
+       vaddr_t vaddr;
 
        ASSERT_SLEEPABLE();
 
 #ifdef __HAVE_MM_MD_DIRECT_MAPPED_PHYS
-    {
-       vaddr_t vaddr1;
-
-       if (mm_md_direct_mapped_phys(paddr, &vaddr1))
-               return;
-    }
+       if (mm_md_direct_mapped_phys(paddr, &vaddr))
+               goto out;
 #endif
 
        mutex_enter(&linux_kmap_lock);
@@ -245,7 +255,7 @@
        rb_tree_remove_node(&linux_kmap_entries, lke);
        mutex_exit(&linux_kmap_lock);
 
-       const vaddr_t vaddr = lke->lke_vaddr;
+       vaddr = lke->lke_vaddr;
        kmem_free(lke, sizeof(*lke));
 
        KASSERT(pmap_extract(pmap_kernel(), vaddr, NULL));
@@ -254,4 +264,6 @@
        pmap_update(pmap_kernel());
 
        uvm_km_free(kernel_map, vaddr, PAGE_SIZE, UVM_KMF_VAONLY);
+
+out:   SDT_PROBE2(sdt, linux, kmap, unmap,  paddr, vaddr);
 }