linux-kernel - [tip: x86/platform] x86/platform/uv: Log gap hole end size

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Date:   Mon, 04 Apr 2022 20:19:11 -0000
From:   "tip-bot2 for Mike Travis" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Mike Travis <mike.travis@....com>, Borislav Petkov <bp@...e.de>,
        Steve Wahl <steve.wahl@....com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/platform] x86/platform/uv: Log gap hole end size

The following commit has been merged into the x86/platform branch of tip:

Commit-ID:     f93ba85de0d1ce1924b0752b6a7a784c11c36414
Gitweb:        https://git.kernel.org/tip/f93ba85de0d1ce1924b0752b6a7a784c11c36414
Author:        Mike Travis <mike.travis@....com>
AuthorDate:    Fri, 18 Mar 2022 17:43:04 -05:00
Committer:     Borislav Petkov <bp@...e.de>
CommitterDate: Mon, 04 Apr 2022 20:21:47 +02:00

x86/platform/uv: Log gap hole end size

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@....com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Reviewed-by: Steve Wahl <steve.wahl@....com>
Link: https://lore.kernel.org/r/20220318224304.174967-4-mike.travis@hpe.com
---
 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 387d653..146f0f6 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 */