From: patrick <patrick@openbsd.org>
Date: Sun, 28 Feb 2021 21:31:10 +0000 (+0000)
Subject: Add acpiiort(4), a driver for the ACPI I/O Remapping Table.  This table
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=ffdeadb517b142331b770fc2004b6e192e61ba55;p=openbsd

Add acpiiort(4), a driver for the ACPI I/O Remapping Table.  This table
contains information which IOMMUs we have and how the devices are routed.

ok kettenis@
---

diff --git a/sys/arch/arm64/dev/acpiiort.c b/sys/arch/arm64/dev/acpiiort.c
new file mode 100644
index 00000000000..4ce2e5438fe
--- /dev/null
+++ b/sys/arch/arm64/dev/acpiiort.c
@@ -0,0 +1,103 @@
+/* $OpenBSD: acpiiort.c,v 1.1 2021/02/28 21:31:10 patrick Exp $ */
+/*
+ * Copyright (c) 2021 Patrick Wildt <patrick@blueri.se>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/device.h>
+
+#include <dev/acpi/acpireg.h>
+#include <dev/acpi/acpivar.h>
+
+#include <arm64/dev/acpiiort.h>
+
+SIMPLEQ_HEAD(, acpiiort_smmu) acpiiort_smmu_list =
+    SIMPLEQ_HEAD_INITIALIZER(acpiiort_smmu_list);
+
+int acpiiort_match(struct device *, void *, void *);
+void acpiiort_attach(struct device *, struct device *, void *);
+
+struct cfattach acpiiort_ca = {
+	sizeof(struct device), acpiiort_match, acpiiort_attach
+};
+
+struct cfdriver acpiiort_cd = {
+	NULL, "acpiiort", DV_DULL
+};
+
+int
+acpiiort_match(struct device *parent, void *match, void *aux)
+{
+	struct acpi_attach_args *aaa = aux;
+	struct acpi_table_header *hdr;
+
+	/* If we do not have a table, it is not us */
+	if (aaa->aaa_table == NULL)
+		return 0;
+
+	/* If it is an IORT table, we can attach */
+	hdr = (struct acpi_table_header *)aaa->aaa_table;
+	if (memcmp(hdr->signature, IORT_SIG, sizeof(IORT_SIG) - 1) != 0)
+		return 0;
+
+	return 1;
+}
+
+void
+acpiiort_attach(struct device *parent, struct device *self, void *aux)
+{
+	struct acpi_attach_args *aaa = aux;
+	struct acpi_iort *iort = (struct acpi_iort *)aaa->aaa_table;
+	struct acpi_iort_node *node;
+	struct acpiiort_attach_args aia;
+	uint32_t offset;
+	int i;
+
+	printf("\n");
+
+	memset(&aia, 0, sizeof(aia));
+	aia.aia_iot = aaa->aaa_iot;
+	aia.aia_memt = aaa->aaa_memt;
+	aia.aia_dmat = aaa->aaa_dmat;
+
+	offset = iort->offset;
+	for (i = 0; i < iort->number_of_nodes; i++) {
+		node = (struct acpi_iort_node *)((char *)iort + offset);
+		aia.aia_node = node;
+		config_found(self, &aia, NULL);
+		offset += node->length;
+	}
+}
+
+void
+acpiiort_smmu_register(struct acpiiort_smmu *as)
+{
+	SIMPLEQ_INSERT_TAIL(&acpiiort_smmu_list, as, as_list);
+}
+
+void
+acpiiort_smmu_hook(struct acpi_iort_node *node, uint32_t rid,
+    struct pci_attach_args *pa)
+{
+	struct acpiiort_smmu *as;
+
+	SIMPLEQ_FOREACH(as, &acpiiort_smmu_list, as_list) {
+		if (as->as_node == node) {
+			as->as_hook(as->as_cookie, rid, pa);
+			break;
+		}
+	}
+}
diff --git a/sys/arch/arm64/dev/acpiiort.h b/sys/arch/arm64/dev/acpiiort.h
new file mode 100644
index 00000000000..2ee15345d00
--- /dev/null
+++ b/sys/arch/arm64/dev/acpiiort.h
@@ -0,0 +1,35 @@
+/* $OpenBSD: acpiiort.h,v 1.1 2021/02/28 21:31:10 patrick Exp $ */
+/*
+ * Copyright (c) 2021 Patrick Wildt <patrick@blueri.se>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+struct acpiiort_attach_args {
+	struct acpi_iort_node	*aia_node;
+	bus_space_tag_t		 aia_iot;
+	bus_space_tag_t		 aia_memt;
+	bus_dma_tag_t		 aia_dmat;
+};
+
+struct acpiiort_smmu {
+	SIMPLEQ_ENTRY(acpiiort_smmu) as_list;
+	struct acpi_iort_node	*as_node;
+	void			*as_cookie;
+	void			(*as_hook)(void *, uint32_t,
+				    struct pci_attach_args *);
+};
+
+void acpiiort_smmu_register(struct acpiiort_smmu *);
+void acpiiort_smmu_hook(struct acpi_iort_node *, uint32_t,
+    struct pci_attach_args *);