From 86f58a13be65c96be3af84bf3ad0fdbe4f13f8e1 Mon Sep 17 00:00:00 2001
From: msmith <msmith@FreeBSD.org>
Date: Wed, 31 Jan 2001 09:35:50 +0000
Subject: Add some debugging.

Turn off semaphores.  Nobody else implements them, and there is lots of
AML out there which does totally absurd things with them, meaning that
if we try to do the right thing we are guaranteed to fail.
---
 sys/dev/acpica/Osd/OsdSynch.c | 80 ++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 72 insertions(+), 8 deletions(-)

(limited to 'sys/dev/acpica')

diff --git a/sys/dev/acpica/Osd/OsdSynch.c b/sys/dev/acpica/Osd/OsdSynch.c
index 154bce9..79ae4f5 100644
--- a/sys/dev/acpica/Osd/OsdSynch.c
+++ b/sys/dev/acpica/Osd/OsdSynch.c
@@ -37,8 +37,14 @@
 #include <sys/malloc.h>
 #include <sys/mutex.h>
 
+#define _COMPONENT	OS_DEPENDENT
+MODULE_NAME("SYNCH")
+
 static MALLOC_DEFINE(M_ACPISEM, "acpisem", "ACPI semaphore");
 
+/* disable semaphores - AML in the field doesn't use them correctly */
+#define ACPI_NO_SEMAPHORES
+
 /*
  * Simple counting semaphore implemented using a mutex. (Subsequently used
  * in the OSI code to implement a mutex.  Go figure.)
@@ -47,36 +53,62 @@ struct acpi_semaphore {
     struct mtx	as_mtx;
     UINT32	as_units;
     UINT32	as_maxunits;
+    char	*as_name;
 };
 
 ACPI_STATUS
 AcpiOsCreateSemaphore(UINT32 MaxUnits, UINT32 InitialUnits, ACPI_HANDLE *OutHandle)
 {
+#ifndef ACPI_NO_SEMAPHORES
     struct acpi_semaphore	*as;
 
+    FUNCTION_TRACE(__FUNCTION__);
+
     if (OutHandle == NULL)
 	return(AE_BAD_PARAMETER);
     if (InitialUnits > MaxUnits)
-	return(AE_BAD_PARAMETER);
+	return_ACPI_STATUS(AE_BAD_PARAMETER);
 
     if ((as = malloc(sizeof(*as), M_ACPISEM, M_NOWAIT)) == NULL)
-	return(AE_NO_MEMORY);
+	return_ACPI_STATUS(AE_NO_MEMORY);
 
     mtx_init(&as->as_mtx, "ACPI semaphore", MTX_DEF);
     as->as_units = InitialUnits;
     as->as_maxunits = MaxUnits;
+    as->as_name = malloc(strlen(name) + 1, M_ACPISEM, M_NOWAIT);
+    strcpy(as->as_name, name);
+
+    DEBUG_PRINT(TRACE_MUTEX, ("created semaphore %p max %d, initial %d\n", 
+			      as, InitialUnits, MaxUnits));
 
     *OutHandle = (ACPI_HANDLE)as;
+    return_ACPI_STATUS(AE_OK);
+#else
+    *OutHandle = (ACPI_HANDLE)OutHandle;
     return(AE_OK);
+#endif
 }
 
 ACPI_STATUS
 AcpiOsDeleteSemaphore (ACPI_HANDLE Handle)
 {
+#ifndef ACPI_NO_SEMAPHORES
     struct acpi_semaphore *as = (struct acpi_semaphore *)Handle;
+
+    FUNCTION_TRACE(__FUNCTION__);
+
+#ifdef ACPI_TRACK_SEMAPHORE
+    printf("destroyed semaphore '%s' @ %p\n", as->as_name, as);
+#else
+    DEBUG_PRINT(TRACE_MUTEX, ("destroyed semaphore %p\n", as));
+#endif
     mtx_destroy(&as->as_mtx);
+    free(as->as_name, M_ACPISEM);
     free(Handle, M_ACPISEM);
+    return_ACPI_STATUS(AE_OK);
+#else
     return(AE_OK);
+#endif
 }
 
 /*
@@ -87,13 +119,29 @@ AcpiOsDeleteSemaphore (ACPI_HANDLE Handle)
 ACPI_STATUS
 AcpiOsWaitSemaphore(ACPI_HANDLE Handle, UINT32 Units, UINT32 Timeout)
 {
+#ifndef ACPI_NO_SEMAPHORES
     struct acpi_semaphore	*as = (struct acpi_semaphore *)Handle;
-    int				result;
+    ACPI_STATUS			result;
+    int				rv, tmo;
+
+    FUNCTION_TRACE(__FUNCTION__);
 
     if (as == NULL)
-	return(AE_BAD_PARAMETER);
+	return_ACPI_STATUS(AE_BAD_PARAMETER);
+
+    /* a timeout of -1 means "forever" */
+    if (Timeout == -1) {
+	tmo = 0;
+    } else {
+	/* compute timeout using microseconds per tick */
+	tmo = (Timeout * 1000) / (1000000 / hz)
+	if (tmo <= 0)
+	    tmo = 1;
+    }
 
     mtx_enter(&as->as_mtx, MTX_DEF);
+    DEBUG_PRINT(TRACE_MUTEX, ("get %d units from semaphore %p (has %d), timeout %d\n",
+			      Units, as, as->as_units, Timeout));
     for (;;) {
 	if (as->as_units >= Units) {
 	    as->as_units -= Units;
@@ -104,30 +152,46 @@ AcpiOsWaitSemaphore(ACPI_HANDLE Handle, UINT32 Units, UINT32 Timeout)
 	    result = AE_TIME;
 	    break;
 	}
-	if (msleep(as, &as->as_mtx, 0, "acpisem", Timeout / (1000 * hz)) == EWOULDBLOCK) {
+	DEBUG_PRINT(TRACE_MUTEX, ("semaphore blocked, calling msleep(%p, %p, %d, \"acpisem\", %d)\n",
+				  as, as->as_mtx, 0, tmo));
+	for (;;) ;
+	
+	rv = msleep(as, &as->as_mtx, 0, "acpisem", tmo);
+	DEBUG_PRINT(TRACE_MUTEX, ("msleep returned %d\n", rv));
+	if (rv == EWOULDBLOCK) {
 	    result = AE_TIME;
 	    break;
 	}
     }
     mtx_exit(&as->as_mtx, MTX_DEF);
 
-    return(result);
+    return_ACPI_STATUS(result);
+#else
+    return(AE_OK);
+#endif
 }
 
 ACPI_STATUS
 AcpiOsSignalSemaphore(ACPI_HANDLE Handle, UINT32 Units)
 {
+#ifndef ACPI_NO_SEMAPHORES
     struct acpi_semaphore	*as = (struct acpi_semaphore *)Handle;
 
+    FUNCTION_TRACE(__FUNCTION__);
+
     if (as == NULL)
-	return(AE_BAD_PARAMETER);
+	return_ACPI_STATUS(AE_BAD_PARAMETER);
 
     mtx_enter(&as->as_mtx, MTX_DEF);
+    DEBUG_PRINT(TRACE_MUTEX, ("return %d units to semaphore %p (has %d)\n",
+			      Units, as, as->as_units));
     as->as_units += Units;
     if (as->as_units > as->as_maxunits)
 	as->as_units = as->as_maxunits;
     wakeup(as);
     mtx_exit(&as->as_mtx, MTX_DEF);
-
+    return_ACPI_STATUS(AE_OK);
+#else
     return(AE_OK);
+#endif
 }
-- 
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