Merge branch 'x86-uv-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 UV update from Ingo Molnar:
 "There's a single commit in this tree, which adds support for a new SGI
  UV GRU (Global Reference Unit - fast NUMA messaging ASIC) hardware
  feature to scale up and beyond: an optional distributed mode that will
  allow per-node address mapping of local GRU space, as opposed to
  mapping all GRU hardware to the same contiguous high space"

* 'x86-uv-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/UV: Add GRU distributed mode mappings

1 files changed, 59 insertions, 7 deletions

diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index 794f6eb54cd3..39cc7f7acab3 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -51,6 +51,8 @@ DEFINE_PER_CPU(int, x2apic_extra_bits);
 
 static enum uv_system_type uv_system_type;
 static u64 gru_start_paddr, gru_end_paddr;
+static u64 gru_dist_base, gru_first_node_paddr = -1LL, gru_last_node_paddr;
+static u64 gru_dist_lmask, gru_dist_umask;
 static union uvh_apicid uvh_apicid;
 int uv_min_hub_revision_id;
 EXPORT_SYMBOL_GPL(uv_min_hub_revision_id);
@@ -72,7 +74,20 @@ static unsigned long __init uv_early_read_mmr(unsigned long addr)
 
 static inline bool is_GRU_range(u64 start, u64 end)
 {
-        return start >= gru_start_paddr && end <= gru_end_paddr;
+        if (gru_dist_base) {
+                u64 su = start & gru_dist_umask; /* upper (incl pnode) bits */
+                u64 sl = start & gru_dist_lmask; /* base offset bits */
+                u64 eu = end & gru_dist_umask;
+                u64 el = end & gru_dist_lmask;
+
+                /* Must reside completely within a single GRU range */
+                return (sl == gru_dist_base && el == gru_dist_base &&
+                        su >= gru_first_node_paddr &&
+                        su <= gru_last_node_paddr &&
+                        eu == su);
+        } else {
+                return start >= gru_start_paddr && end <= gru_end_paddr;
+        }
 }
 
 static bool uv_is_untracked_pat_range(u64 start, u64 end)
@@ -463,26 +478,63 @@ static __init void map_high(char *id, unsigned long base, int pshift,
                 pr_info("UV: Map %s_HI base address NULL\n", id);
                 return;
         }
-        pr_info("UV: Map %s_HI 0x%lx - 0x%lx\n", id, paddr, paddr + bytes);
+        pr_debug("UV: Map %s_HI 0x%lx - 0x%lx\n", id, paddr, paddr + bytes);
         if (map_type == map_uc)
                 init_extra_mapping_uc(paddr, bytes);
         else
                 init_extra_mapping_wb(paddr, bytes);
 }
 
+static __init void map_gru_distributed(unsigned long c)
+{
+        union uvh_rh_gam_gru_overlay_config_mmr_u gru;
+        u64 paddr;
+        unsigned long bytes;
+        int nid;
+
+        gru.v = c;
+        /* only base bits 42:28 relevant in dist mode */
+        gru_dist_base = gru.v & 0x000007fff0000000UL;
+        if (!gru_dist_base) {
+                pr_info("UV: Map GRU_DIST base address NULL\n");
+                return;
+        }
+        bytes = 1UL << UVH_RH_GAM_GRU_OVERLAY_CONFIG_MMR_BASE_SHFT;
+        gru_dist_lmask = ((1UL << uv_hub_info->m_val) - 1) & ~(bytes - 1);
+        gru_dist_umask = ~((1UL << uv_hub_info->m_val) - 1);
+        gru_dist_base &= gru_dist_lmask; /* Clear bits above M */
+        for_each_online_node(nid) {
+                paddr = ((u64)uv_node_to_pnode(nid) << uv_hub_info->m_val) |
+                                gru_dist_base;
+                init_extra_mapping_wb(paddr, bytes);
+                gru_first_node_paddr = min(paddr, gru_first_node_paddr);
+                gru_last_node_paddr = max(paddr, gru_last_node_paddr);
+        }
+        /* Save upper (63:M) bits of address only for is_GRU_range */
+        gru_first_node_paddr &= gru_dist_umask;
+        gru_last_node_paddr &= gru_dist_umask;
+        pr_debug("UV: Map GRU_DIST base 0x%016llx  0x%016llx - 0x%016llx\n",
+                gru_dist_base, gru_first_node_paddr, gru_last_node_paddr);
+}
+
 static __init void map_gru_high(int max_pnode)
 {
         union uvh_rh_gam_gru_overlay_config_mmr_u gru;
         int shift = UVH_RH_GAM_GRU_OVERLAY_CONFIG_MMR_BASE_SHFT;
 
         gru.v = uv_read_local_mmr(UVH_RH_GAM_GRU_OVERLAY_CONFIG_MMR);
-        if (gru.s.enable) {
-                map_high("GRU", gru.s.base, shift, shift, max_pnode, map_wb);
-                gru_start_paddr = ((u64)gru.s.base << shift);
-                gru_end_paddr = gru_start_paddr + (1UL << shift) * (max_pnode + 1);
-        } else {
+        if (!gru.s.enable) {
                 pr_info("UV: GRU disabled\n");
+                return;
+        }
+
+        if (is_uv3_hub() && gru.s3.mode) {
+                map_gru_distributed(gru.v);
+                return;
         }
+        map_high("GRU", gru.s.base, shift, shift, max_pnode, map_wb);
+        gru_start_paddr = ((u64)gru.s.base << shift);
+        gru_end_paddr = gru_start_paddr + (1UL << shift) * (max_pnode + 1);
 }
 
 static __init void map_mmr_high(int max_pnode)