From c036ab1656490febf4f67341ec7871139e9c7103 Mon Sep 17 00:00:00 2001
From: jsg <jsg@openbsd.org>
Date: Wed, 20 Mar 2024 02:42:17 +0000
Subject: [PATCH] add vmap_pfn()

---
 sys/dev/pci/drm/drm_linux.c             | 24 +++++++++++++++++++++++-
 sys/dev/pci/drm/include/linux/vmalloc.h |  3 ++-
 2 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/sys/dev/pci/drm/drm_linux.c b/sys/dev/pci/drm/drm_linux.c
index 7e548a78493..efe42503e83 100644
--- a/sys/dev/pci/drm/drm_linux.c
+++ b/sys/dev/pci/drm/drm_linux.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: drm_linux.c,v 1.110 2024/03/20 02:38:35 jsg Exp $	*/
+/*	$OpenBSD: drm_linux.c,v 1.111 2024/03/20 02:42:17 jsg Exp $	*/
 /*
  * Copyright (c) 2013 Jonathan Gray <jsg@openbsd.org>
  * Copyright (c) 2015, 2016 Mark Kettenis <kettenis@openbsd.org>
@@ -673,6 +673,28 @@ vmap(struct vm_page **pages, unsigned int npages, unsigned long flags,
 	return (void *)va;
 }
 
+void *
+vmap_pfn(unsigned long *pfns, unsigned int npfn, pgprot_t prot)
+{
+	vaddr_t va;
+	paddr_t pa;
+	int i;
+
+	va = (vaddr_t)km_alloc(PAGE_SIZE * npfn, &kv_any, &kp_none,
+	    &kd_nowait);
+	if (va == 0)
+		return NULL;
+	for (i = 0; i < npfn; i++) {
+		pa = round_page(pfns[i]) | prot;
+		pmap_enter(pmap_kernel(), va + (i * PAGE_SIZE), pa,
+		    PROT_READ | PROT_WRITE,
+		    PROT_READ | PROT_WRITE | PMAP_WIRED);
+		pmap_update(pmap_kernel());
+	}
+
+	return (void *)va;
+}
+
 void
 vunmap(void *addr, size_t size)
 {
diff --git a/sys/dev/pci/drm/include/linux/vmalloc.h b/sys/dev/pci/drm/include/linux/vmalloc.h
index e2b4fa0115f..f3f4ae2fdd6 100644
--- a/sys/dev/pci/drm/include/linux/vmalloc.h
+++ b/sys/dev/pci/drm/include/linux/vmalloc.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: vmalloc.h,v 1.6 2024/01/16 23:38:13 jsg Exp $	*/
+/*	$OpenBSD: vmalloc.h,v 1.7 2024/03/20 02:42:17 jsg Exp $	*/
 /*
  * Copyright (c) 2013, 2014, 2015 Mark Kettenis
  *
@@ -25,6 +25,7 @@
 #include <linux/types.h> /* for pgprot_t */
 
 void	*vmap(struct vm_page **, unsigned int, unsigned long, pgprot_t);
+void	*vmap_pfn(unsigned long *, unsigned int, pgprot_t);
 void	 vunmap(void *, size_t);
 
 static inline void *
-- 
2.20.1