sparc64: Add auxiliary vectors to report platform ADI properties

ADI feature on M7 and newer processors has three important properties
relevant to userspace apps using ADI capabilities - (1) Size of block of
memory an ADI version tag applies to, (2) Number of uppermost bits in
virtual address used to encode ADI tag, and (3) The value M7 processor
will force the ADI tags to if it detects uncorrectable error in an ADI
tagged cacheline. Kernel can retrieve these properties for a platform
through machine description provided by the firmware. This patch adds
code to retrieve these properties and report them to userspace through
auxiliary vectors.

Signed-off-by: Khalid Aziz <khalid.aziz@oracle.com>
Cc: Khalid Aziz <khalid@gonehiking.org>
Reviewed-by: Anthony Yznaga <anthony.yznaga@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

7 files changed, 168 insertions, 0 deletions

diff --git a/arch/sparc/include/asm/adi.h b/arch/sparc/include/asm/adi.h
new file mode 100644
index 000000000000..acad0d04e4c6
--- /dev/null
+++ b/arch/sparc/include/asm/adi.h
@@ -0,0 +1,6 @@
+#ifndef ___ASM_SPARC_ADI_H
+#define ___ASM_SPARC_ADI_H
+#if defined(__sparc__) && defined(__arch64__)
+#include <asm/adi_64.h>
+#endif
+#endif
diff --git a/arch/sparc/include/asm/adi_64.h b/arch/sparc/include/asm/adi_64.h
new file mode 100644
index 000000000000..85f7a763af85
--- /dev/null
+++ b/arch/sparc/include/asm/adi_64.h
@@ -0,0 +1,47 @@
+/* adi_64.h: ADI related data structures
+ *
+ * Copyright (c) 2016 Oracle and/or its affiliates. All rights reserved.
+ * Author: Khalid Aziz (khalid.aziz@oracle.com)
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.
+ */
+#ifndef __ASM_SPARC64_ADI_H
+#define __ASM_SPARC64_ADI_H
+
+#include <linux/types.h>
+
+#ifndef __ASSEMBLY__
+
+struct adi_caps {
+        __u64 blksz;
+        __u64 nbits;
+        __u64 ue_on_adi;
+};
+
+struct adi_config {
+        bool enabled;
+        struct adi_caps caps;
+};
+
+extern struct adi_config adi_state;
+
+extern void mdesc_adi_init(void);
+
+static inline bool adi_capable(void)
+{
+        return adi_state.enabled;
+}
+
+static inline unsigned long adi_blksize(void)
+{
+        return adi_state.caps.blksz;
+}
+
+static inline unsigned long adi_nbits(void)
+{
+        return adi_state.caps.nbits;
+}
+
+#endif  /* __ASSEMBLY__ */
+
+#endif  /* !(__ASM_SPARC64_ADI_H) */
diff --git a/arch/sparc/include/asm/elf_64.h b/arch/sparc/include/asm/elf_64.h
index 25340df3570c..7e078bc73ef5 100644
--- a/arch/sparc/include/asm/elf_64.h
+++ b/arch/sparc/include/asm/elf_64.h
@@ -10,6 +10,7 @@
 #include <asm/processor.h>
 #include <asm/extable_64.h>
 #include <asm/spitfire.h>
+#include <asm/adi.h>
 
 /*
  * Sparc section types
@@ -215,9 +216,13 @@ extern unsigned int vdso_enabled;
 
 #define ARCH_DLINFO                                                     \
 do {                                                                    \
+        extern struct adi_config adi_state;                             \
         if (vdso_enabled)                                               \
                 NEW_AUX_ENT(AT_SYSINFO_EHDR,                            \
                             (unsigned long)current->mm->context.vdso);  \
+        NEW_AUX_ENT(AT_ADI_BLKSZ, adi_state.caps.blksz);                \
+        NEW_AUX_ENT(AT_ADI_NBITS, adi_state.caps.nbits);                \
+        NEW_AUX_ENT(AT_ADI_UEONADI, adi_state.caps.ue_on_adi);          \
 } while (0)
 
 struct linux_binprm;
diff --git a/arch/sparc/include/uapi/asm/auxvec.h b/arch/sparc/include/uapi/asm/auxvec.h
index 5f80a70cc901..f9937ccfcd99 100644
--- a/arch/sparc/include/uapi/asm/auxvec.h
+++ b/arch/sparc/include/uapi/asm/auxvec.h
@@ -3,6 +3,17 @@
 
 #define AT_SYSINFO_EHDR         33
 
+#ifdef CONFIG_SPARC64
+/* Avoid overlap with other AT_* values since they are consolidated in
+ * glibc and any overlaps can cause problems
+ */
+#define AT_ADI_BLKSZ    48
+#define AT_ADI_NBITS    49
+#define AT_ADI_UEONADI  50
+
+#define AT_VECTOR_SIZE_ARCH     4
+#else
 #define AT_VECTOR_SIZE_ARCH     1
+#endif
 
 #endif /* !(__ASMSPARC_AUXVEC_H) */
diff --git a/arch/sparc/kernel/Makefile b/arch/sparc/kernel/Makefile
index cc97545737f0..76cb57750dda 100644
--- a/arch/sparc/kernel/Makefile
+++ b/arch/sparc/kernel/Makefile
@@ -69,6 +69,7 @@ obj-$(CONFIG_SPARC64)   += visemul.o
 obj-$(CONFIG_SPARC64)   += hvapi.o
 obj-$(CONFIG_SPARC64)   += sstate.o
 obj-$(CONFIG_SPARC64)   += mdesc.o
+obj-$(CONFIG_SPARC64)   += adi_64.o
 obj-$(CONFIG_SPARC64)   += pcr.o
 obj-$(CONFIG_SPARC64)   += nmi.o
 obj-$(CONFIG_SPARC64_SMP) += cpumap.o
diff --git a/arch/sparc/kernel/adi_64.c b/arch/sparc/kernel/adi_64.c
new file mode 100644
index 000000000000..8fb72585d9f1
--- /dev/null
+++ b/arch/sparc/kernel/adi_64.c
@@ -0,0 +1,96 @@
+/* adi_64.c: support for ADI (Application Data Integrity) feature on
+ * sparc m7 and newer processors. This feature is also known as
+ * SSM (Silicon Secured Memory).
+ *
+ * Copyright (C) 2016 Oracle and/or its affiliates. All rights reserved.
+ * Author: Khalid Aziz (khalid.aziz@oracle.com)
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.
+ */
+#include <linux/init.h>
+#include <asm/mdesc.h>
+#include <asm/adi_64.h>
+
+struct adi_config adi_state;
+
+/* mdesc_adi_init() : Parse machine description provided by the
+ *      hypervisor to detect ADI capabilities
+ *
+ * Hypervisor reports ADI capabilities of platform in "hwcap-list" property
+ * for "cpu" node. If the platform supports ADI, "hwcap-list" property
+ * contains the keyword "adp". If the platform supports ADI, "platform"
+ * node will contain "adp-blksz", "adp-nbits" and "ue-on-adp" properties
+ * to describe the ADI capabilities.
+ */
+void __init mdesc_adi_init(void)
+{
+        struct mdesc_handle *hp = mdesc_grab();
+        const char *prop;
+        u64 pn, *val;
+        int len;
+
+        if (!hp)
+                goto adi_not_found;
+
+        pn = mdesc_node_by_name(hp, MDESC_NODE_NULL, "cpu");
+        if (pn == MDESC_NODE_NULL)
+                goto adi_not_found;
+
+        prop = mdesc_get_property(hp, pn, "hwcap-list", &len);
+        if (!prop)
+                goto adi_not_found;
+
+        /*
+         * Look for "adp" keyword in hwcap-list which would indicate
+         * ADI support
+         */
+        adi_state.enabled = false;
+        while (len) {
+                int plen;
+
+                if (!strcmp(prop, "adp")) {
+                        adi_state.enabled = true;
+                        break;
+                }
+
+                plen = strlen(prop) + 1;
+                prop += plen;
+                len -= plen;
+        }
+
+        if (!adi_state.enabled)
+                goto adi_not_found;
+
+        /* Find the ADI properties in "platform" node. If all ADI
+         * properties are not found, ADI support is incomplete and
+         * do not enable ADI in the kernel.
+         */
+        pn = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform");
+        if (pn == MDESC_NODE_NULL)
+                goto adi_not_found;
+
+        val = (u64 *) mdesc_get_property(hp, pn, "adp-blksz", &len);
+        if (!val)
+                goto adi_not_found;
+        adi_state.caps.blksz = *val;
+
+        val = (u64 *) mdesc_get_property(hp, pn, "adp-nbits", &len);
+        if (!val)
+                goto adi_not_found;
+        adi_state.caps.nbits = *val;
+
+        val = (u64 *) mdesc_get_property(hp, pn, "ue-on-adp", &len);
+        if (!val)
+                goto adi_not_found;
+        adi_state.caps.ue_on_adi = *val;
+
+        mdesc_release(hp);
+        return;
+
+adi_not_found:
+        adi_state.enabled = false;
+        adi_state.caps.blksz = 0;
+        adi_state.caps.nbits = 0;
+        if (hp)
+                mdesc_release(hp);
+}
diff --git a/arch/sparc/kernel/mdesc.c b/arch/sparc/kernel/mdesc.c
index 418592a09b41..39a2503fa3e1 100644
--- a/arch/sparc/kernel/mdesc.c
+++ b/arch/sparc/kernel/mdesc.c
@@ -22,6 +22,7 @@
 #include <linux/uaccess.h>
 #include <asm/oplib.h>
 #include <asm/smp.h>
+#include <asm/adi.h>
 
 /* Unlike the OBP device tree, the machine description is a full-on
  * DAG.  An arbitrary number of ARCs are possible from one
@@ -1345,5 +1346,6 @@ void __init sun4v_mdesc_init(void)
 
         cur_mdesc = hp;
 
+        mdesc_adi_init();
         report_platform_properties();
 }