linux-kernel - [PATCH] perf/x86/intel/uncore: Make uncore

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Message-Id: <20220218175418.421268-1-steve.wahl@hpe.com>
Date:   Fri, 18 Feb 2022 11:54:18 -0600
From:   Steve Wahl <steve.wahl@....com>
To:     Steve Wahl <steve.wahl@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     "Liang, Kan" <kan.liang@...el.com>
Subject: [PATCH] perf/x86/intel/uncore: Make uncore_discovery clean for 64 bit addresses

Support 64-bit BAR size for discovery, and do not truncate return from
generic_uncore_mmio_box_ctl() to 32 bits.

Signed-off-by: Steve Wahl <steve.wahl@....com>
---
 arch/x86/events/intel/uncore_discovery.c | 16 +++++++++++-----
 arch/x86/events/intel/uncore_discovery.h |  2 --
 2 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/arch/x86/events/intel/uncore_discovery.c b/arch/x86/events/intel/uncore_discovery.c
index 3049c646fa20..141a540e7403 100644
--- a/arch/x86/events/intel/uncore_discovery.c
+++ b/arch/x86/events/intel/uncore_discovery.c
@@ -210,15 +210,21 @@ static int parse_discovery_table(struct pci_dev *dev, int die,
 	void __iomem *io_addr;
 	resource_size_t addr;
 	unsigned long size;
-	u32 val;
+	u32 val, val2;
 	int i;
 
 	pci_read_config_dword(dev, bar_offset, &val);
 
-	if (val & UNCORE_DISCOVERY_MASK)
+	if (val & ~PCI_BASE_ADDRESS_MEM_MASK & ~PCI_BASE_ADDRESS_MEM_TYPE_64)
 		return -EINVAL;
 
-	addr = (resource_size_t)(val & ~UNCORE_DISCOVERY_MASK);
+	addr = (resource_size_t)(val & PCI_BASE_ADDRESS_MEM_MASK);
+#ifdef CONFIG_PHYS_ADDR_T_64BIT
+	if ((val & PCI_BASE_ADDRESS_MEM_TYPE_MASK) == PCI_BASE_ADDRESS_MEM_TYPE_64) {
+		pci_read_config_dword(dev, bar_offset + 4, &val2);
+		addr |= ((resource_size_t)val2) << 32;
+	}
+#endif
 	size = UNCORE_DISCOVERY_GLOBAL_MAP_SIZE;
 	io_addr = ioremap(addr, size);
 	if (!io_addr)
@@ -444,7 +450,7 @@ static struct intel_uncore_ops generic_uncore_pci_ops = {
 
 #define UNCORE_GENERIC_MMIO_SIZE		0x4000
 
-static unsigned int generic_uncore_mmio_box_ctl(struct intel_uncore_box *box)
+static u64 generic_uncore_mmio_box_ctl(struct intel_uncore_box *box)
 {
 	struct intel_uncore_type *type = box->pmu->type;
 
@@ -456,7 +462,7 @@ static unsigned int generic_uncore_mmio_box_ctl(struct intel_uncore_box *box)
 
 void intel_generic_uncore_mmio_init_box(struct intel_uncore_box *box)
 {
-	unsigned int box_ctl = generic_uncore_mmio_box_ctl(box);
+	u64 box_ctl = generic_uncore_mmio_box_ctl(box);
 	struct intel_uncore_type *type = box->pmu->type;
 	resource_size_t addr;
 
diff --git a/arch/x86/events/intel/uncore_discovery.h b/arch/x86/events/intel/uncore_discovery.h
index 6d735611c281..22d40e7afbf1 100644
--- a/arch/x86/events/intel/uncore_discovery.h
+++ b/arch/x86/events/intel/uncore_discovery.h
@@ -18,8 +18,6 @@
 #define UNCORE_DISCOVERY_BIR_BASE		0x10
 /* Discovery table BAR step */
 #define UNCORE_DISCOVERY_BIR_STEP		0x4
-/* Mask of the discovery table offset */
-#define UNCORE_DISCOVERY_MASK			0xf
 /* Global discovery table size */
 #define UNCORE_DISCOVERY_GLOBAL_MAP_SIZE	0x20
 
-- 
2.26.2