add vmap_pfn()

diff --git a/sys/dev/pci/drm/drm_linux.c b/sys/dev/pci/drm/drm_linux.c
index 7e548a7..efe4250 100644 (file)
--- 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 e2b4fa0..f3f4ae2 100644 (file)
--- 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 *