x86/platform/UV: Update physical address conversions for UV4

This patch builds support for the new conversions of physical addresses
to and from sockets, pnodes and nodes in UV4.  It is designed to be as
efficient as possible as lookups are done inside an interrupt context
in some cases.  It will be further optimized when physical hardware is
available to measure execution time.

Tested-by: Dimitri Sivanich <sivanich@sgi.com>
Tested-by: John Estabrook <estabrook@sgi.com>
Tested-by: Gary Kroening <gfk@sgi.com>
Tested-by: Nathan Zimmer <nzimmer@sgi.com>
Signed-off-by: Mike Travis <travis@sgi.com>
Cc: Andrew Banman <abanman@sgi.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Len Brown <len.brown@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Russ Anderson <rja@sgi.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20160429215405.841051741@asylum.americas.sgi.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 95 insertions, 1 deletions

diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index 259c3dd889c6..65a40d4a95fe 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -310,6 +310,7 @@ static __initdata struct uv_gam_parameters *uv_gp_table;
 static __initdata unsigned short *_socket_to_node;
 static __initdata unsigned short *_socket_to_pnode;
 static __initdata unsigned short *_pnode_to_socket;
+static __initdata struct uv_gam_range_s *_gr_table;
 #define	SOCK_EMPTY	((unsigned short)~0)
 
 extern int uv_hub_info_version(void)
@@ -318,6 +319,97 @@ extern int uv_hub_info_version(void)
 }
 EXPORT_SYMBOL(uv_hub_info_version);
 
+/* Build GAM range lookup table */
+static __init void build_uv_gr_table(void)
+{
+	struct uv_gam_range_entry *gre = uv_gre_table;
+	struct uv_gam_range_s *grt;
+	unsigned long last_limit = 0, ram_limit = 0;
+	int bytes, i, sid, lsid = -1;
+
+	if (!gre)
+		return;
+
+	bytes = _gr_table_len * sizeof(struct uv_gam_range_s);
+	grt = kzalloc(bytes, GFP_KERNEL);
+	BUG_ON(!grt);
+	_gr_table = grt;
+
+	for (; gre->type != UV_GAM_RANGE_TYPE_UNUSED; gre++) {
+		if (gre->type == UV_GAM_RANGE_TYPE_HOLE) {
+			if (!ram_limit) {   /* mark hole between ram/non-ram */
+				ram_limit = last_limit;
+				last_limit = gre->limit;
+				lsid++;
+				continue;
+			}
+			last_limit = gre->limit;
+			pr_info("UV: extra hole in GAM RE table @%d\n",
+				(int)(gre - uv_gre_table));
+			continue;
+		}
+		if (_max_socket < gre->sockid) {
+			pr_err("UV: GAM table sockid(%d) too large(>%d) @%d\n",
+				gre->sockid, _max_socket,
+				(int)(gre - uv_gre_table));
+			continue;
+		}
+		sid = gre->sockid - _min_socket;
+		if (lsid < sid) {		/* new range */
+			grt = &_gr_table[sid];
+			grt->base = lsid;
+			grt->nasid = gre->nasid;
+			grt->limit = last_limit = gre->limit;
+			lsid = sid;
+			continue;
+		}
+		if (lsid == sid && !ram_limit) {	/* update range */
+			if (grt->limit == last_limit) {	/* .. if contiguous */
+				grt->limit = last_limit = gre->limit;
+				continue;
+			}
+		}
+		if (!ram_limit) {		/* non-contiguous ram range */
+			grt++;
+			grt->base = sid - 1;
+			grt->nasid = gre->nasid;
+			grt->limit = last_limit = gre->limit;
+			continue;
+		}
+		grt++;				/* non-contiguous/non-ram */
+		grt->base = grt - _gr_table;	/* base is this entry */
+		grt->nasid = gre->nasid;
+		grt->limit = last_limit = gre->limit;
+		lsid++;
+	}
+
+	/* shorten table if possible */
+	grt++;
+	i = grt - _gr_table;
+	if (i < _gr_table_len) {
+		void *ret;
+
+		bytes = i * sizeof(struct uv_gam_range_s);
+		ret = krealloc(_gr_table, bytes, GFP_KERNEL);
+		if (ret) {
+			_gr_table = ret;
+			_gr_table_len = i;
+		}
+	}
+
+	/* display resultant gam range table */
+	for (i = 0, grt = _gr_table; i < _gr_table_len; i++, grt++) {
+		int gb = grt->base;
+		unsigned long start = gb < 0 ?  0 :
+			(unsigned long)_gr_table[gb].limit << UV_GAM_RANGE_SHFT;
+		unsigned long end =
+			(unsigned long)grt->limit << UV_GAM_RANGE_SHFT;
+
+		pr_info("UV: GAM Range %2d %04x 0x%013lx-0x%013lx (%d)\n",
+			i, grt->nasid, start, end, gb);
+	}
+}
+
 static int uv_wakeup_secondary(int phys_apicid, unsigned long start_rip)
 {
 	unsigned long val;
@@ -992,6 +1084,8 @@ void __init uv_init_hub_info(struct uv_hub_info_s *hub_info)
 	hub_info->pnode_to_socket = _pnode_to_socket;
 	hub_info->socket_to_node = _socket_to_node;
 	hub_info->socket_to_pnode = _socket_to_pnode;
+	hub_info->gr_table_len = _gr_table_len;
+	hub_info->gr_table = _gr_table;
 	hub_info->gpa_mask = mn.m_val ?
 		(1UL << (mn.m_val + mn.n_val)) - 1 :
 		(1UL << uv_cpuid.gpa_shift) - 1;
@@ -1086,7 +1180,6 @@ static void __init decode_gam_rng_tbl(unsigned long ptr)
 		if (pnode_max < gre->pnode)
 			pnode_max = gre->pnode;
 	}
-
 	_min_socket = sock_min;
 	_max_socket = sock_max;
 	_min_pnode = pnode_min;
@@ -1332,6 +1425,7 @@ void __init uv_system_init(void)
 	uv_bios_init();			/* get uv_systab for decoding */
 	decode_uv_systab();
 	build_socket_tables();
+	build_uv_gr_table();
 	uv_init_hub_info(&hub_info);
 	uv_possible_blades = num_possible_nodes();
 	if (!_node_to_pnode)