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[src/trunk]: src/sys/dev/acpi Introduce weighted matching for ACPI autoconfig...
details: https://anonhg.NetBSD.org/src/rev/e3908de22db5
branches: trunk
changeset: 958987:e3908de22db5
user: thorpej <thorpej%NetBSD.org@localhost>
date: Wed Jan 27 05:11:54 2021 +0000
description:
Introduce weighted matching for ACPI autoconfiguration, and provide
acpi_compatible_match() based around device_compatible_entry. Matches
against _HID score big, matches against _CID are weighted in the
standard most-to-least-specific ordering, less than _HID.
Also provide a maching value for _CLS, that's always less than _HID
and _CID matches, and use that in acpi_match_class().
Also provide acpi_compatible_lookup(), that returing the matching
entry based on the same criteria.
diffstat:
sys/dev/acpi/acpi_util.c | 146 ++++++++++++++++++++++++++++++++++++++--------
sys/dev/acpi/acpivar.h | 14 ++++-
2 files changed, 133 insertions(+), 27 deletions(-)
diffs (238 lines):
diff -r a3aa7616242f -r e3908de22db5 sys/dev/acpi/acpi_util.c
--- a/sys/dev/acpi/acpi_util.c Wed Jan 27 05:00:15 2021 +0000
+++ b/sys/dev/acpi/acpi_util.c Wed Jan 27 05:11:54 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: acpi_util.c,v 1.22 2021/01/26 00:23:16 jmcneill Exp $ */
+/* $NetBSD: acpi_util.c,v 1.23 2021/01/27 05:11:54 thorpej Exp $ */
/*-
* Copyright (c) 2003, 2007, 2021 The NetBSD Foundation, Inc.
@@ -65,7 +65,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: acpi_util.c,v 1.22 2021/01/26 00:23:16 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: acpi_util.c,v 1.23 2021/01/27 05:11:54 thorpej Exp $");
#include <sys/param.h>
#include <sys/kmem.h>
@@ -306,7 +306,7 @@
}
/*
- * Pack _HID and _CID ID strings into an OpenFirmware-like
+ * Pack _HID and _CID ID strings into an OpenFirmware-style
* string list.
*/
char *
@@ -314,50 +314,144 @@
{
KASSERT(sizep != NULL);
- char *strlist, *cp;
- size_t len = 0;
+ char *sl = NULL;
+ size_t slsize = 0;
uint32_t i;
- /*
- * First calculate the total size required.
- * N.B. PNP Device ID length includes terminating NUL.
- */
if ((ad->Valid & ACPI_VALID_HID) != 0) {
- len += ad->HardwareId.Length;
+ strlist_append(&sl, &slsize, ad->HardwareId.String);
}
if ((ad->Valid & ACPI_VALID_CID) != 0) {
for (i = 0; i < ad->CompatibleIdList.Count; i++) {
- len += ad->CompatibleIdList.Ids[i].Length;
+ strlist_append(&sl, &slsize,
+ ad->CompatibleIdList.Ids[i].String);
}
}
- *sizep = len;
- if (len == 0) {
+ *sizep = slsize;
+ return sl;
+}
+
+/*
+ * The ACPI_PNP_DEVICE_ID type is somewhat inconvenient for us to
+ * use. We'll need some temporary space to pack it into an array
+ * of C strings. Room for 8 should be plenty, but we can allocate
+ * more if necessary.
+ */
+#define ACPI_COMPATSTR_MAX 8
+
+static const char **
+acpi_compatible_alloc_strarray(ACPI_PNP_DEVICE_ID *ids,
+ unsigned int count, const char **buf)
+{
+ unsigned int i;
+
+ buf = kmem_tmpbuf_alloc(count * sizeof(const char *),
+ buf, ACPI_COMPATSTR_MAX * sizeof(const char *), KM_SLEEP);
+ for (i = 0; i < count; i++) {
+ buf[i] = ids[i].String;
+ }
+ return buf;
+}
+
+static void
+acpi_compatible_free_strarray(const char **cpp, unsigned int count,
+ const char **buf)
+{
+ kmem_tmpbuf_free(cpp, count * sizeof(const char *), buf);
+}
+
+/*
+ * acpi_compatible_match --
+ *
+ * Returns a weighted match value, comparing the _HID and _CID
+ * IDs against a driver's compatbility data.
+ */
+int
+acpi_compatible_match(const struct acpi_attach_args * const aa,
+ const struct device_compatible_entry * const dce)
+{
+ const char *strings[ACPI_COMPATSTR_MAX * sizeof(const char *)];
+ const char **cpp;
+
+ if (aa->aa_node->ad_type != ACPI_TYPE_DEVICE) {
+ return 0;
+ }
+
+ ACPI_DEVICE_INFO *ad = aa->aa_node->ad_devinfo;
+
+ if ((ad->Valid & ACPI_VALID_HID) != 0) {
+ strings[0] = ad->HardwareId.String;
+
+ /* Matching _HID wins big. */
+ if (device_compatible_pmatch(strings, 1, dce) != 0) {
+ return ACPI_MATCHSCORE_HID;
+ }
+ }
+
+ if ((ad->Valid & ACPI_VALID_CID) != 0) {
+ cpp = acpi_compatible_alloc_strarray(ad->CompatibleIdList.Ids,
+ ad->CompatibleIdList.Count, strings);
+ int rv;
+
+ rv = device_compatible_pmatch(cpp,
+ ad->CompatibleIdList.Count, dce);
+ acpi_compatible_free_strarray(cpp, ad->CompatibleIdList.Count,
+ strings);
+ if (rv) {
+ rv = (rv - 1) + ACPI_MATCHSCORE_CID;
+ if (rv > ACPI_MATCHSCORE_CID_MAX) {
+ rv = ACPI_MATCHSCORE_CID_MAX;
+ }
+ return rv;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * acpi_compatible_lookup --
+ *
+ * Returns the device_compatible_entry that matches the _HID
+ * or _CID ID.
+ */
+const struct device_compatible_entry *
+acpi_compatible_lookup(const struct acpi_attach_args * const aa,
+ const struct device_compatible_entry * const dce)
+{
+ const struct device_compatible_entry *rv = NULL;
+ const char *strings[ACPI_COMPATSTR_MAX];
+ const char **cpp;
+
+ if (aa->aa_node->ad_type != ACPI_TYPE_DEVICE) {
return NULL;
}
- cp = strlist = kmem_alloc(len, KM_SLEEP);
+ ACPI_DEVICE_INFO *ad = aa->aa_node->ad_devinfo;
if ((ad->Valid & ACPI_VALID_HID) != 0) {
- memcpy(cp, ad->HardwareId.String, ad->HardwareId.Length);
- cp += ad->HardwareId.Length;
+ strings[0] = ad->HardwareId.String;
+
+ rv = device_compatible_plookup(strings, 1, dce);
+ if (rv != NULL)
+ return rv;
}
if ((ad->Valid & ACPI_VALID_CID) != 0) {
- for (i = 0; i < ad->CompatibleIdList.Count; i++) {
- memcpy(cp, ad->CompatibleIdList.Ids[i].String,
- ad->CompatibleIdList.Ids[i].Length);
- cp += ad->CompatibleIdList.Ids[i].Length;
- }
+ cpp = acpi_compatible_alloc_strarray(ad->CompatibleIdList.Ids,
+ ad->CompatibleIdList.Count, strings);
+
+ rv = device_compatible_plookup(cpp,
+ ad->CompatibleIdList.Count, dce);
+ acpi_compatible_free_strarray(cpp, ad->CompatibleIdList.Count,
+ strings);
}
- KASSERT((size_t)(cp - strlist) == len);
-
- return strlist;
+ return rv;
}
-
/*
* Match given IDs against _HID and _CIDs.
*/
@@ -428,7 +522,7 @@
done:
if (buf.Pointer)
ACPI_FREE(buf.Pointer);
- return match;
+ return match ? ACPI_MATCHSCORE_CLS : 0;
}
/*
diff -r a3aa7616242f -r e3908de22db5 sys/dev/acpi/acpivar.h
--- a/sys/dev/acpi/acpivar.h Wed Jan 27 05:00:15 2021 +0000
+++ b/sys/dev/acpi/acpivar.h Wed Jan 27 05:11:54 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: acpivar.h,v 1.83 2020/12/06 11:38:28 jmcneill Exp $ */
+/* $NetBSD: acpivar.h,v 1.84 2021/01/27 05:11:54 thorpej Exp $ */
/*
* Copyright 2001 Wasabi Systems, Inc.
@@ -195,6 +195,12 @@
bus_dma_tag_t aa_dmat64; /* PCI 64bit DMA tag */
};
+/* ACPI driver matching scores. */
+#define ACPI_MATCHSCORE_HID 100 /* matched _HID */
+#define ACPI_MATCHSCORE_CID_MAX 49
+#define ACPI_MATCHSCORE_CID 10 /* matched _CID */
+#define ACPI_MATCHSCORE_CLS 1 /* matched _CLS */
+
/*
* ACPI resources:
*
@@ -306,6 +312,12 @@
void acpi_disable(void);
int acpi_check(device_t, const char *);
+int acpi_compatible_match(const struct acpi_attach_args *,
+ const struct device_compatible_entry *);
+const struct device_compatible_entry *
+ acpi_compatible_lookup(const struct acpi_attach_args *,
+ const struct device_compatible_entry *);
+
bool acpi_device_present(ACPI_HANDLE);
int acpi_reset(void);
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