linux-kernel - [PATCH 18/20] ACPICA: IORT: Updates for revision E.d

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Message-ID: <44610361.fMDQidcC6G@kreacher>
Date:   Mon, 11 Apr 2022 21:02:33 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Linux ACPI <linux-acpi@...r.kernel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Bob Moore <robert.moore@...el.com>
Subject: [PATCH 18/20] ACPICA: IORT: Updates for revision E.d

From: Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>

ACPICA commit 87a2e39b8abdfedfb86b0a105708e37e895becd9

IORT revision is now updated to E.d (ARM DEN 0049E.d) and
contains a few additions like,
    -Added descriptor in the root complex node for specifying
     PASID width supported by the root complex.
    -Updated RMR node Flags field.
    -Introduced memory access attributes in the RMR node.

Please note that IORT Rev E.c is deprecated and not supported.

Link: https://github.com/acpica/acpica/commit/87a2e39b
Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>
Signed-off-by: Bob Moore <robert.moore@...el.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 include/acpi/actbl2.h |   27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

Index: linux-pm/include/acpi/actbl2.h
===================================================================
--- linux-pm.orig/include/acpi/actbl2.h
+++ linux-pm/include/acpi/actbl2.h
@@ -357,7 +357,7 @@ struct acpi_table_bdat {
  * IORT - IO Remapping Table
  *
  * Conforms to "IO Remapping Table System Software on ARM Platforms",
- * Document number: ARM DEN 0049E.b, Feb 2021
+ * Document number: ARM DEN 0049E.d, Feb 2022
  *
  ******************************************************************************/
 
@@ -454,7 +454,8 @@ struct acpi_iort_root_complex {
 	u32 ats_attribute;
 	u32 pci_segment_number;
 	u8 memory_address_limit;	/* Memory address size limit */
-	u8 reserved[3];		/* Reserved, must be zero */
+	u16 pasid_capabilities;	/* PASID Capabilities */
+	u8 reserved[1];		/* Reserved, must be zero */
 };
 
 /* Masks for ats_attribute field above */
@@ -463,6 +464,9 @@ struct acpi_iort_root_complex {
 #define ACPI_IORT_PRI_SUPPORTED         (1<<1)	/* The root complex PRI support */
 #define ACPI_IORT_PASID_FWD_SUPPORTED   (1<<2)	/* The root complex PASID forward support */
 
+/* Masks for pasid_capabilities field above */
+#define ACPI_IORT_PASID_MAX_WIDTH       (0x1F)	/* Bits 0-4 */
+
 struct acpi_iort_smmu {
 	u64 base_address;	/* SMMU base address */
 	u64 span;		/* Length of memory range */
@@ -538,6 +542,25 @@ struct acpi_iort_rmr {
 	u32 rmr_offset;
 };
 
+/* Masks for Flags field above */
+#define ACPI_IORT_RMR_REMAP_PERMITTED      (1)
+#define ACPI_IORT_RMR_ACCESS_PRIVILEGE     (1<<1)
+
+/*
+ * Macro to access the Access Attributes in flags field above:
+ *  Access Attributes is encoded in bits 9:2
+ */
+#define ACPI_IORT_RMR_ACCESS_ATTRIBUTES(flags)          (((flags) >> 2) & 0xFF)
+
+/* Values for above Access Attributes */
+
+#define ACPI_IORT_RMR_ATTR_DEVICE_NGNRNE   0x00
+#define ACPI_IORT_RMR_ATTR_DEVICE_NGNRE    0x01
+#define ACPI_IORT_RMR_ATTR_DEVICE_NGRE     0x02
+#define ACPI_IORT_RMR_ATTR_DEVICE_GRE      0x03
+#define ACPI_IORT_RMR_ATTR_NORMAL_NC       0x04
+#define ACPI_IORT_RMR_ATTR_NORMAL_IWB_OWB  0x05
+
 struct acpi_iort_rmr_desc {
 	u64 base_address;
 	u64 length;