svn commit: r346066 - head/sys/dev/acpica

[John Baldwin]

Author: jhb
Date: Tue Apr  9 21:18:02 2019
New Revision: 346066
URL: https://svnweb.freebsd.org/changeset/base/346066

Log:
  Refine r330113 to honor the ProducerConsumer flag most of the time.
  
  While it is true that the ACPI spec says that the flag is only valid
  on Extended Address Space Descriptors, examples of other descriptors
  in the spec use the ProducerConsumer flag explicitly, and real
  hardware uses it as well.  In fact, even in the ASL of the Thunder X2
  for which r330113 was a workaround, some devices use this flag on
  non-Extended Address Space Descriptors correctly.  Instead, only
  ignore the flag for resources associated with the UART devices on the
  Thunder X2 using the "ARMH0011" HID to identify these devices.
  
  This should fix regressions from ignoring this flag in other contexts
  such as Hyper-V.
  
  PR:		235876
  Reported by:	Wei Hu <weh at microsoft.com>
  Tested by:	emaste (Thunder X2)
  MFC after:	2 weeks

Modified:
  head/sys/dev/acpica/acpi_resource.c

Modified: head/sys/dev/acpica/acpi_resource.c
==============================================================================
--- head/sys/dev/acpica/acpi_resource.c	Tue Apr  9 20:20:04 2019	(r346065)
+++ head/sys/dev/acpica/acpi_resource.c	Tue Apr  9 21:18:02 2019	(r346066)
@@ -202,6 +202,7 @@ struct acpi_resource_context {
     struct acpi_parse_resource_set *set;
     device_t	dev;
     void	*context;
+    bool	ignore_producer_flag;
 };
 
 #ifdef ACPI_DEBUG_OUTPUT
@@ -385,7 +386,7 @@ acpi_parse_resource(ACPI_RESOURCE *res, void *context)
 	}
 	if (length <= 0)
 	    break;
-	if (res->Type == ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64 &&
+	if (!arc->ignore_producer_flag &&
 	    res->Data.Address.ProducerConsumer != ACPI_CONSUMER) {
 	    ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
 		"ignored %s %s producer\n", name,
@@ -474,6 +475,12 @@ acpi_parse_resources(device_t dev, ACPI_HANDLE handle,
     set->set_init(dev, arg, &arc.context);
     arc.set = set;
     arc.dev = dev;
+    arc.ignore_producer_flag = false;
+
+    /* UARTs on ThunderX2 set ResourceProducer on memory resources. */
+    if (acpi_MatchHid(handle, "ARMH0011") != ACPI_MATCHHID_NOMATCH)
+	    arc.ignore_producer_flag = true;
+
     status = AcpiWalkResources(handle, "_CRS", acpi_parse_resource, &arc);
     if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 	printf("can't fetch resources for %s - %s\n",