[IA64-SGI] cleanup the way XPC locates the reserved page

Eliminate the passing in of a scratch buffer used for locating the
reserved page setup for XPC.

Signed-off-by: Dean Nelson <dcn@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 26 insertions, 13 deletions

diff --git a/arch/ia64/sn/kernel/xpc_partition.c b/arch/ia64/sn/kernel/xpc_partition.c
index 6bb1091f2a4d..ce5a37ff4388 100644
--- a/arch/ia64/sn/kernel/xpc_partition.c
+++ b/arch/ia64/sn/kernel/xpc_partition.c
@@ -85,13 +85,16 @@ char ____cacheline_aligned xpc_remote_copy_buffer[XPC_RP_HEADER_SIZE +
  * for that nasid. This function returns 0 on any error.
  */
 static u64
-xpc_get_rsvd_page_pa(int nasid, u64 buf, u64 buf_size)
+xpc_get_rsvd_page_pa(int nasid)
 {
         bte_result_t bte_res;
         s64 status;
         u64 cookie = 0;
         u64 rp_pa = nasid;      /* seed with nasid */
         u64 len = 0;
+        u64 buf = buf;
+        u64 buf_len = 0;
+        void *buf_base = NULL;
 
 
         while (1) {
@@ -107,13 +110,22 @@ xpc_get_rsvd_page_pa(int nasid, u64 buf, u64 buf_size)
                         break;
                 }
 
-                if (len > buf_size) {
-                        dev_err(xpc_part, "len (=0x%016lx) > buf_size\n", len);
-                        status = SALRET_ERROR;
-                        break;
+                if (L1_CACHE_ALIGN(len) > buf_len) {
+                        if (buf_base != NULL) {
+                                kfree(buf_base);
+                        }
+                        buf_len = L1_CACHE_ALIGN(len);
+                        buf = (u64) xpc_kmalloc_cacheline_aligned(buf_len,
+                                                        GFP_KERNEL, &buf_base);
+                        if (buf_base == NULL) {
+                                dev_err(xpc_part, "unable to kmalloc "
+                                        "len=0x%016lx\n", buf_len);
+                                status = SALRET_ERROR;
+                                break;
+                        }
                 }
 
-                bte_res = xp_bte_copy(rp_pa, ia64_tpa(buf), buf_size,
+                bte_res = xp_bte_copy(rp_pa, ia64_tpa(buf), buf_len,
                                         (BTE_NOTIFY | BTE_WACQUIRE), NULL);
                 if (bte_res != BTE_SUCCESS) {
                         dev_dbg(xpc_part, "xp_bte_copy failed %i\n", bte_res);
@@ -122,6 +134,10 @@ xpc_get_rsvd_page_pa(int nasid, u64 buf, u64 buf_size)
                 }
         }
 
+        if (buf_base != NULL) {
+                kfree(buf_base);
+        }
+
         if (status != SALRET_OK) {
                 rp_pa = 0;
         }
@@ -146,10 +162,9 @@ xpc_rsvd_page_init(void)
 
         /* get the local reserved page's address */
 
-        rp_pa = xpc_get_rsvd_page_pa(cnodeid_to_nasid(0),
-                                        (u64) xpc_remote_copy_buffer,
-                                                XPC_RP_HEADER_SIZE +
-                                                        L1_CACHE_BYTES);
+        preempt_disable();
+        rp_pa = xpc_get_rsvd_page_pa(cpuid_to_nasid(smp_processor_id()));
+        preempt_enable();
         if (rp_pa == 0) {
                 dev_err(xpc_part, "SAL failed to locate the reserved page\n");
                 return NULL;
@@ -455,9 +470,7 @@ xpc_get_remote_rp(int nasid, u64 *discovered_nasids,
 
         /* get the reserved page's physical address */
 
-        *remote_rp_pa = xpc_get_rsvd_page_pa(nasid, (u64) remote_rp,
-                                                XPC_RP_HEADER_SIZE +
-                                                        xp_nasid_mask_bytes);
+        *remote_rp_pa = xpc_get_rsvd_page_pa(nasid);
         if (*remote_rp_pa == 0) {
                 return xpcNoRsvdPageAddr;
         }