x86/platform/UV: Fix GAM MMR references in the UV x2apic code

Along with the fixes in UV4A (rev2) MMRs, the code to access those
MMRs also was modified by the fixes.  UV3, UV4, and UV4A no longer
have compatible setups for Global Address Memory (GAM).

Correct the new mistakes.

Signed-off-by: Mike Travis <mike.travis@hpe.com>
Acked-by: Andrew Banman <abanman@hpe.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Dimitri Sivanich <sivanich@hpe.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Russ Anderson <rja@hpe.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1515440405-20880-6-git-send-email-mike.travis@hpe.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/kernel/apic/x2apic_uv_x.c

@@ -794,70 +794,61 @@ static __init void map_mmr_high(int max_pnode)
 		pr_info("UV: MMR disabled\n");
 }
 
-/*
- * This commonality works because both 0 & 1 versions of the MMIOH OVERLAY
- * and REDIRECT MMR regs are exactly the same on UV3.
- */
-struct mmioh_config {
-	unsigned long overlay;
-	unsigned long redirect;
-	char *id;
-};
-
-static __initdata struct mmioh_config mmiohs[] = {
-	{
-		UV3H_RH_GAM_MMIOH_OVERLAY_CONFIG0_MMR,
-		UV3H_RH_GAM_MMIOH_REDIRECT_CONFIG0_MMR,
-		"MMIOH0"
-	},
-	{
-		UV3H_RH_GAM_MMIOH_OVERLAY_CONFIG1_MMR,
-		UV3H_RH_GAM_MMIOH_REDIRECT_CONFIG1_MMR,
-		"MMIOH1"
-	},
-};
-
-/* UV3 & UV4 have identical MMIOH overlay configs */
-static __init void map_mmioh_high_uv3(int index, int min_pnode, int max_pnode)
+/* UV3/4 have identical MMIOH overlay configs, UV4A is slightly different */
+static __init void map_mmioh_high_uv34(int index, int min_pnode, int max_pnode)
 {
-	union uvh_rh_gam_mmioh_overlay_config0_mmr_u overlay;
+	unsigned long overlay;
 	unsigned long mmr;
 	unsigned long base;
+	unsigned long nasid_mask;
 	unsigned long m_overlay;
 	int i, n, shift, m_io, max_io;
 	int nasid, lnasid, fi, li;
 	char *id;
 
-	id = mmiohs[index].id;
-	overlay.v = uv_read_local_mmr(mmiohs[index].overlay);
-	m_overlay = mmiohs[index].overlay;
-
-	pr_info("UV: %s overlay 0x%lx(@0x%lx) base:0x%x m_io:%d\n",
-		id, overlay.v, m_overlay, overlay.s3.base, overlay.s3.m_io);
-	if (!overlay.s3.enable) {
+	if (index == 0) {
+		id = "MMIOH0";
+		m_overlay = UVH_RH_GAM_MMIOH_OVERLAY_CONFIG0_MMR;
+		overlay = uv_read_local_mmr(m_overlay);
+		base = overlay & UVH_RH_GAM_MMIOH_OVERLAY_CONFIG0_MMR_BASE_MASK;
+		mmr = UVH_RH_GAM_MMIOH_REDIRECT_CONFIG0_MMR;
+		m_io = (overlay & UVH_RH_GAM_MMIOH_OVERLAY_CONFIG0_MMR_M_IO_MASK)
+			>> UVH_RH_GAM_MMIOH_OVERLAY_CONFIG0_MMR_M_IO_SHFT;
+		shift = UVH_RH_GAM_MMIOH_OVERLAY_CONFIG0_MMR_M_IO_SHFT;
+		n = UVH_RH_GAM_MMIOH_REDIRECT_CONFIG0_MMR_DEPTH;
+		nasid_mask = UVH_RH_GAM_MMIOH_REDIRECT_CONFIG0_MMR_NASID_MASK;
+	} else {
+		id = "MMIOH1";
+		m_overlay = UVH_RH_GAM_MMIOH_OVERLAY_CONFIG1_MMR;
+		overlay = uv_read_local_mmr(m_overlay);
+		base = overlay & UVH_RH_GAM_MMIOH_OVERLAY_CONFIG1_MMR_BASE_MASK;
+		mmr = UVH_RH_GAM_MMIOH_REDIRECT_CONFIG1_MMR;
+		m_io = (overlay & UVH_RH_GAM_MMIOH_OVERLAY_CONFIG1_MMR_M_IO_MASK)
+			>> UVH_RH_GAM_MMIOH_OVERLAY_CONFIG1_MMR_M_IO_SHFT;
+		shift = UVH_RH_GAM_MMIOH_OVERLAY_CONFIG1_MMR_M_IO_SHFT;
+		n = UVH_RH_GAM_MMIOH_REDIRECT_CONFIG1_MMR_DEPTH;
+		nasid_mask = UVH_RH_GAM_MMIOH_REDIRECT_CONFIG1_MMR_NASID_MASK;
+	}
+	pr_info("UV: %s overlay 0x%lx base:0x%lx m_io:%d\n", id, overlay, base, m_io);
+	if (!(overlay & UVH_RH_GAM_MMIOH_OVERLAY_CONFIG0_MMR_ENABLE_MASK)) {
 		pr_info("UV: %s disabled\n", id);
 		return;
 	}
 
-	shift = UV3H_RH_GAM_MMIOH_OVERLAY_CONFIG0_MMR_BASE_SHFT;
-	base = (unsigned long)overlay.s3.base;
-	m_io = overlay.s3.m_io;
-	mmr = mmiohs[index].redirect;
-	n = UV3H_RH_GAM_MMIOH_REDIRECT_CONFIG0_MMR_DEPTH;
 	/* Convert to NASID: */
 	min_pnode *= 2;
 	max_pnode *= 2;
 	max_io = lnasid = fi = li = -1;
 
 	for (i = 0; i < n; i++) {
-		union uvh_rh_gam_mmioh_redirect_config0_mmr_u redirect;
 		unsigned long m_redirect = mmr + i * 8;
+		unsigned long redirect = uv_read_local_mmr(m_redirect);
+
+		nasid = redirect & nasid_mask;
+		if (i == 0)
+			pr_info("UV: %s redirect base 0x%lx(@0x%lx) 0x%04x\n",
+				id, redirect, m_redirect, nasid);
 
-		redirect.v = uv_read_local_mmr(mmr + i * 8);
-		nasid = redirect.s3.nasid;
-		printk_once(KERN_INFO
-			"UV: %s redirect 0x%lx(@0x%lx) 0x%04x\n",
-			id, redirect.v, m_redirect, nasid);
 		/* Invalid NASID: */
 		if (nasid < min_pnode || max_pnode < nasid)
 			nasid = -1;
@@ -905,8 +896,8 @@ static __init void map_mmioh_high(int min_pnode, int max_pnode)
 
 	if (is_uv3_hub() || is_uv4_hub()) {
 		/* Map both MMIOH regions: */
-		map_mmioh_high_uv3(0, min_pnode, max_pnode);
-		map_mmioh_high_uv3(1, min_pnode, max_pnode);
+		map_mmioh_high_uv34(0, min_pnode, max_pnode);
+		map_mmioh_high_uv34(1, min_pnode, max_pnode);
 		return;
 	}