sgi-xp: define xp_expand_memprotect() and xp_restrict_memprotect()

Define xp_expand_memprotect() and xp_restrict_memprotect() so they can be
tailered to the hardware they are run on.

Signed-off-by: Dean Nelson <dcn@sgi.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

5 files changed, 117 insertions, 12 deletions

diff --git a/drivers/misc/sgi-xp/xp.h b/drivers/misc/sgi-xp/xp.h
index 859a5281c61b..974ffe3817b6 100644
--- a/drivers/misc/sgi-xp/xp.h
+++ b/drivers/misc/sgi-xp/xp.h
@@ -190,9 +190,10 @@ enum xp_retval {
         xpGruSendMqError,       /* 59: gru send message queue related error */
 
         xpBadChannelNumber,     /* 60: invalid channel number */
-        xpBadMsgType,           /* 60: invalid message type */
+        xpBadMsgType,           /* 61: invalid message type */
+        xpBiosError,            /* 62: BIOS error */
 
-        xpUnknownReason         /* 61: unknown reason - must be last in enum */
+        xpUnknownReason         /* 63: unknown reason - must be last in enum */
 };
 
 /*
@@ -341,6 +342,8 @@ extern unsigned long (*xp_pa) (void *);
 extern enum xp_retval (*xp_remote_memcpy) (unsigned long, const unsigned long,
                        size_t);
 extern int (*xp_cpu_to_nasid) (int);
+extern enum xp_retval (*xp_expand_memprotect) (unsigned long, unsigned long);
+extern enum xp_retval (*xp_restrict_memprotect) (unsigned long, unsigned long);
 
 extern u64 xp_nofault_PIOR_target;
 extern int xp_nofault_PIOR(void *);
diff --git a/drivers/misc/sgi-xp/xp_main.c b/drivers/misc/sgi-xp/xp_main.c
index 66a1d19e08ad..9a2e77172d94 100644
--- a/drivers/misc/sgi-xp/xp_main.c
+++ b/drivers/misc/sgi-xp/xp_main.c
@@ -51,6 +51,13 @@ EXPORT_SYMBOL_GPL(xp_remote_memcpy);
 int (*xp_cpu_to_nasid) (int cpuid);
 EXPORT_SYMBOL_GPL(xp_cpu_to_nasid);
 
+enum xp_retval (*xp_expand_memprotect) (unsigned long phys_addr,
+                                        unsigned long size);
+EXPORT_SYMBOL_GPL(xp_expand_memprotect);
+enum xp_retval (*xp_restrict_memprotect) (unsigned long phys_addr,
+                                          unsigned long size);
+EXPORT_SYMBOL_GPL(xp_restrict_memprotect);
+
 /*
  * xpc_registrations[] keeps track of xpc_connect()'s done by the kernel-level
  * users of XPC.
diff --git a/drivers/misc/sgi-xp/xp_sn2.c b/drivers/misc/sgi-xp/xp_sn2.c
index 1440134caf31..fb3ec9d735a9 100644
--- a/drivers/misc/sgi-xp/xp_sn2.c
+++ b/drivers/misc/sgi-xp/xp_sn2.c
@@ -120,6 +120,38 @@ xp_cpu_to_nasid_sn2(int cpuid)
         return cpuid_to_nasid(cpuid);
 }
 
+static enum xp_retval
+xp_expand_memprotect_sn2(unsigned long phys_addr, unsigned long size)
+{
+        u64 nasid_array = 0;
+        int ret;
+
+        ret = sn_change_memprotect(phys_addr, size, SN_MEMPROT_ACCESS_CLASS_1,
+                                   &nasid_array);
+        if (ret != 0) {
+                dev_err(xp, "sn_change_memprotect(,, "
+                        "SN_MEMPROT_ACCESS_CLASS_1,) failed ret=%d\n", ret);
+                return xpSalError;
+        }
+        return xpSuccess;
+}
+
+static enum xp_retval
+xp_restrict_memprotect_sn2(unsigned long phys_addr, unsigned long size)
+{
+        u64 nasid_array = 0;
+        int ret;
+
+        ret = sn_change_memprotect(phys_addr, size, SN_MEMPROT_ACCESS_CLASS_0,
+                                   &nasid_array);
+        if (ret != 0) {
+                dev_err(xp, "sn_change_memprotect(,, "
+                        "SN_MEMPROT_ACCESS_CLASS_0,) failed ret=%d\n", ret);
+                return xpSalError;
+        }
+        return xpSuccess;
+}
+
 enum xp_retval
 xp_init_sn2(void)
 {
@@ -132,6 +164,8 @@ xp_init_sn2(void)
         xp_pa = xp_pa_sn2;
         xp_remote_memcpy = xp_remote_memcpy_sn2;
         xp_cpu_to_nasid = xp_cpu_to_nasid_sn2;
+        xp_expand_memprotect = xp_expand_memprotect_sn2;
+        xp_restrict_memprotect = xp_restrict_memprotect_sn2;
 
         return xp_register_nofault_code_sn2();
 }
diff --git a/drivers/misc/sgi-xp/xp_uv.c b/drivers/misc/sgi-xp/xp_uv.c
index d9f7ce2510bc..c1bfec2b173c 100644
--- a/drivers/misc/sgi-xp/xp_uv.c
+++ b/drivers/misc/sgi-xp/xp_uv.c
@@ -15,6 +15,11 @@
 
 #include <linux/device.h>
 #include <asm/uv/uv_hub.h>
+#if defined CONFIG_X86_64
+#include <asm/uv/bios.h>
+#elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
+#include <asm/sn/sn_sal.h>
+#endif
 #include "../sgi-gru/grukservices.h"
 #include "xp.h"
 
@@ -49,6 +54,65 @@ xp_cpu_to_nasid_uv(int cpuid)
         return UV_PNODE_TO_NASID(uv_cpu_to_pnode(cpuid));
 }
 
+static enum xp_retval
+xp_expand_memprotect_uv(unsigned long phys_addr, unsigned long size)
+{
+        int ret;
+
+#if defined CONFIG_X86_64
+        ret = uv_bios_change_memprotect(phys_addr, size, UV_MEMPROT_ALLOW_RW);
+        if (ret != BIOS_STATUS_SUCCESS) {
+                dev_err(xp, "uv_bios_change_memprotect(,, "
+                        "UV_MEMPROT_ALLOW_RW) failed, ret=%d\n", ret);
+                return xpBiosError;
+        }
+
+#elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
+        u64 nasid_array;
+
+        ret = sn_change_memprotect(phys_addr, size, SN_MEMPROT_ACCESS_CLASS_1,
+                                   &nasid_array);
+        if (ret != 0) {
+                dev_err(xp, "sn_change_memprotect(,, "
+                        "SN_MEMPROT_ACCESS_CLASS_1,) failed ret=%d\n", ret);
+                return xpSalError;
+        }
+#else
+        #error not a supported configuration
+#endif
+        return xpSuccess;
+}
+
+static enum xp_retval
+xp_restrict_memprotect_uv(unsigned long phys_addr, unsigned long size)
+{
+        int ret;
+
+#if defined CONFIG_X86_64
+        ret = uv_bios_change_memprotect(phys_addr, size,
+                                        UV_MEMPROT_RESTRICT_ACCESS);
+        if (ret != BIOS_STATUS_SUCCESS) {
+                dev_err(xp, "uv_bios_change_memprotect(,, "
+                        "UV_MEMPROT_RESTRICT_ACCESS) failed, ret=%d\n", ret);
+                return xpBiosError;
+        }
+
+#elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
+        u64 nasid_array;
+
+        ret = sn_change_memprotect(phys_addr, size, SN_MEMPROT_ACCESS_CLASS_0,
+                                   &nasid_array);
+        if (ret != 0) {
+                dev_err(xp, "sn_change_memprotect(,, "
+                        "SN_MEMPROT_ACCESS_CLASS_0,) failed ret=%d\n", ret);
+                return xpSalError;
+        }
+#else
+        #error not a supported configuration
+#endif
+        return xpSuccess;
+}
+
 enum xp_retval
 xp_init_uv(void)
 {
@@ -61,6 +125,8 @@ xp_init_uv(void)
         xp_pa = xp_pa_uv;
         xp_remote_memcpy = xp_remote_memcpy_uv;
         xp_cpu_to_nasid = xp_cpu_to_nasid_uv;
+        xp_expand_memprotect = xp_expand_memprotect_uv;
+        xp_restrict_memprotect = xp_restrict_memprotect_uv;
 
         return xpSuccess;
 }
diff --git a/drivers/misc/sgi-xp/xpc_sn2.c b/drivers/misc/sgi-xp/xpc_sn2.c
index b4882ccf6344..73b7fb8de47a 100644
--- a/drivers/misc/sgi-xp/xpc_sn2.c
+++ b/drivers/misc/sgi-xp/xpc_sn2.c
@@ -553,22 +553,17 @@ static u64 xpc_prot_vec_sn2[MAX_NUMNODES];
 static enum xp_retval
 xpc_allow_amo_ops_sn2(struct amo *amos_page)
 {
-        u64 nasid_array = 0;
-        int ret;
+        enum xp_retval ret = xpSuccess;
 
         /*
          * On SHUB 1.1, we cannot call sn_change_memprotect() since the BIST
          * collides with memory operations. On those systems we call
          * xpc_allow_amo_ops_shub_wars_1_1_sn2() instead.
          */
-        if (!enable_shub_wars_1_1()) {
-                ret = sn_change_memprotect(ia64_tpa((u64)amos_page), PAGE_SIZE,
-                                           SN_MEMPROT_ACCESS_CLASS_1,
-                                           &nasid_array);
-                if (ret != 0)
-                        return xpSalError;
-        }
-        return xpSuccess;
+        if (!enable_shub_wars_1_1())
+                ret = xp_expand_memprotect(ia64_tpa((u64)amos_page), PAGE_SIZE);
+
+        return ret;
 }
 
 /*