linux-kernel - [PATCH 2/4] perf/x86/intel/uncore: Support customized MMIO map size

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Message-Id: <20250113150218.2375811-2-kan.liang@linux.intel.com>
Date: Mon, 13 Jan 2025 07:02:16 -0800
From: kan.liang@...ux.intel.com
To: peterz@...radead.org,
	mingo@...hat.com,
	linux-kernel@...r.kernel.org
Cc: Kan Liang <kan.liang@...ux.intel.com>
Subject: [PATCH 2/4] perf/x86/intel/uncore: Support customized MMIO map size

From: Kan Liang <kan.liang@...ux.intel.com>

For a server platform, the MMIO map size is always 0x4000. However, a
client platform may have a smaller map size.

Make the map size customizable.

Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
---
 arch/x86/events/intel/uncore_discovery.c | 2 +-
 arch/x86/events/intel/uncore_snbep.c     | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/events/intel/uncore_discovery.c b/arch/x86/events/intel/uncore_discovery.c
index 8dc9b712dafb..bfd8af90d02d 100644
--- a/arch/x86/events/intel/uncore_discovery.c
+++ b/arch/x86/events/intel/uncore_discovery.c
@@ -655,7 +655,7 @@ void intel_generic_uncore_mmio_init_box(struct intel_uncore_box *box)
 	}
 
 	addr = unit->addr;
-	box->io_addr = ioremap(addr, UNCORE_GENERIC_MMIO_SIZE);
+	box->io_addr = ioremap(addr, type->mmio_map_size);
 	if (!box->io_addr) {
 		pr_warn("Uncore type %d box %d: ioremap error for 0x%llx.\n",
 			type->type_id, unit->id, (unsigned long long)addr);
diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c
index 60973c209c0e..48e19b26dca6 100644
--- a/arch/x86/events/intel/uncore_snbep.c
+++ b/arch/x86/events/intel/uncore_snbep.c
@@ -6495,6 +6495,8 @@ static void uncore_type_customized_copy(struct intel_uncore_type *to_type,
 		to_type->get_topology = from_type->get_topology;
 	if (from_type->cleanup_mapping)
 		to_type->cleanup_mapping = from_type->cleanup_mapping;
+	if (from_type->mmio_map_size)
+		to_type->mmio_map_size = from_type->mmio_map_size;
 }
 
 static struct intel_uncore_type **
-- 
2.38.1