[src/trunk]: src/sys/arch/arm/acpi The DMA restrictions may not be defined in...

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

details:   https://anonhg.NetBSD.org/src/rev/5caf5e81d3b7
branches:  trunk
changeset: 968001:5caf5e81d3b7
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Tue Dec 31 11:42:46 2019 +0000

description:
The DMA restrictions may not be defined in the direct parent of a device,
so search up the tree for a module device.

diffstat:

 sys/arch/arm/acpi/acpi_machdep.c |  37 +++++++++++++++++++++++++++++--------
 1 files changed, 29 insertions(+), 8 deletions(-)

diffs (70 lines):

diff -r 27483891c47d -r 5caf5e81d3b7 sys/arch/arm/acpi/acpi_machdep.c
--- a/sys/arch/arm/acpi/acpi_machdep.c  Tue Dec 31 10:30:30 2019 +0000
+++ b/sys/arch/arm/acpi/acpi_machdep.c  Tue Dec 31 11:42:46 2019 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: acpi_machdep.c,v 1.15 2019/12/30 19:50:29 jmcneill Exp $ */
+/* $NetBSD: acpi_machdep.c,v 1.16 2019/12/31 11:42:46 jmcneill Exp $ */
 
 /*-
  * Copyright (c) 2018 The NetBSD Foundation, Inc.
@@ -32,7 +32,7 @@
 #include "pci.h"
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: acpi_machdep.c,v 1.15 2019/12/30 19:50:29 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: acpi_machdep.c,v 1.16 2019/12/31 11:42:46 jmcneill Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -410,9 +410,32 @@
        return dmat;
 }
 
+static ACPI_HANDLE
+arm_acpi_dma_module(struct acpi_softc *sc, struct acpi_devnode *ad)
+{
+       ACPI_HANDLE tmp;
+       ACPI_STATUS rv;
+
+       /*
+        * Search up the tree for a module device with a _DMA method.
+        */
+       for (; ad != NULL; ad = ad->ad_parent) {
+               if (ad->ad_devinfo->Type != ACPI_TYPE_DEVICE)
+                       continue;
+               if (!acpi_match_hid(ad->ad_devinfo, module_hid))
+                       continue;
+               rv = AcpiGetHandle(ad->ad_handle, "_DMA", &tmp);
+               if (ACPI_SUCCESS(rv))
+                       return ad->ad_handle;
+       }
+
+       return NULL;
+}
+
 bus_dma_tag_t
 arm_acpi_dma_tag(struct acpi_softc *sc, struct acpi_devnode *ad)
 {
+       ACPI_HANDLE module;
        ACPI_INTEGER cca;
        bus_dma_tag_t dmat;
 
@@ -425,14 +448,12 @@
                dmat = &arm_generic_dma_tag;
 
        /*
-        * If the parent device is a bus, it may define valid DMA ranges
+        * If a parent device is a bus, it may define valid DMA ranges
         * and translations for child nodes.
         */
-       if (ad->ad_parent != NULL &&
-           acpi_match_hid(ad->ad_parent->ad_devinfo, module_hid)) {
-               dmat = arm_acpi_dma_tag_subregion(sc, dmat,
-                   ad->ad_parent->ad_handle);
-       }
+       module = arm_acpi_dma_module(sc, ad);
+       if (module != NULL)
+               dmat = arm_acpi_dma_tag_subregion(sc, dmat, module);
 
        return dmat;
 }