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From:   Mike Travis <mike.travis@hpe.com>
To:     Borislav Petkov <bp@alien8.de>, Ingo Molnar <mingo@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Steve Wahl <steve.wahl@hpe.com>, x86@kernel.org
Cc:     Mike Travis <mike.travis@hpe.com>,
        Andy Shevchenko <andy@infradead.org>,
        Darren Hart <dvhart@infradead.org>,
        Dimitri Sivanich <dimitri.sivanich@hpe.com>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Russ Anderson <russ.anderson@hpe.com>,
        linux-kernel@vger.kernel.org, platform-driver-x86@vger.kernel.org
Subject: [PATCH v3 3/3] x86/platform/uv: Log gap hole end size
Date:   Fri, 18 Mar 2022 17:43:04 -0500
Message-Id: <20220318224304.174967-4-mike.travis@hpe.com>
In-Reply-To: <20220318224304.174967-1-mike.travis@hpe.com>
References: <20220318224304.174967-1-mike.travis@hpe.com>
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Show value of gap end in the kernel log which equates to number of physical
address bits used by system.  The end address of the gap holds PA bits 56:26
which gives the range up to 64PB max size with 64MB of granularity.

Signed-off-by: Mike Travis <mike.travis@hpe.com>
Reviewed-by: Steve Wahl <steve.wahl@hpe.com>
---
v2: Update patch description to be more explanatory.
---
 arch/x86/kernel/apic/x2apic_uv_x.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index 387d6533549a..146f0f63a43b 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -1346,7 +1346,7 @@ static void __init decode_gam_params(unsigned long ptr)
 static void __init decode_gam_rng_tbl(unsigned long ptr)
 {
 	struct uv_gam_range_entry *gre = (struct uv_gam_range_entry *)ptr;
-	unsigned long lgre = 0;
+	unsigned long lgre = 0, gend = 0;
 	int index = 0;
 	int sock_min = 999999, pnode_min = 99999;
 	int sock_max = -1, pnode_max = -1;
@@ -1380,6 +1380,9 @@ static void __init decode_gam_rng_tbl(unsigned long ptr)
 			flag, size, suffix[order],
 			gre->type, gre->nasid, gre->sockid, gre->pnode);
 
+		if (gre->type == UV_GAM_RANGE_TYPE_HOLE)
+			gend = (unsigned long)gre->limit << UV_GAM_RANGE_SHFT;
+
 		/* update to next range start */
 		lgre = gre->limit;
 		if (sock_min > gre->sockid)
@@ -1397,7 +1400,8 @@ static void __init decode_gam_rng_tbl(unsigned long ptr)
 	_max_pnode	= pnode_max;
 	_gr_table_len	= index;
 
-	pr_info("UV: GRT: %d entries, sockets(min:%x,max:%x) pnodes(min:%x,max:%x)\n", index, _min_socket, _max_socket, _min_pnode, _max_pnode);
+	pr_info("UV: GRT: %d entries, sockets(min:%x,max:%x), pnodes(min:%x,max:%x), gap_end(%d)\n",
+	  index, _min_socket, _max_socket, _min_pnode, _max_pnode, fls64(gend));
 }
 
 /* Walk through UVsystab decoding the fields */
-- 
2.26.2