linux-kernel - [PATCH] [RESEND] perf/x86/intel/uncore: Fix the index of PCU.3 Broadwell CPUs

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Date:   Tue, 10 Jul 2018 19:31:58 -0400
From:   Masayoshi Mizuma <msys.mizuma@...il.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Cc:     Masayoshi Mizuma <msys.mizuma@...il.com>,
        linux-kernel@...r.kernel.org,
        Masayoshi Mizuma <m.mizuma@...fujitsu.com>
Subject: [PATCH] [RESEND] perf/x86/intel/uncore: Fix the index of PCU.3 Broadwell CPUs

From: Masayoshi Mizuma <m.mizuma@...fujitsu.com>

commit 15a3e845b01c ("perf/x86/intel/uncore: Fix SBOX support for
Broadwell CPUs") introduced PCU.3 for Broadwell CPU. Unfortunately,
the driver_data of PCU.3 conflicts to QPI Port 2 filter.

    { /* QPI Port 2 filter  */
            PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x6f46),
            .driver_data = UNCORE_PCI_DEV_DATA(UNCORE_EXTRA_PCI_DEV, 2),

    { /* PCU.3 (for Capability registers) */
            PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x6fc0),
            .driver_data = UNCORE_PCI_DEV_DATA(UNCORE_EXTRA_PCI_DEV,
                                               HSWEP_PCI_PCU_3),
                             // HSWEP_PCI_PCU_3 == 2

As the result, the index for each device gets same, so the pci device
is overwrited in uncore_extra_pci_dev[pkg].dev[idx] when it is probed.

static int uncore_pci_probe(struct pci_dev *pdev,...
{
...
        if (UNCORE_PCI_DEV_TYPE(id->driver_data) == UNCORE_EXTRA_PCI_DEV) {
                int idx = UNCORE_PCI_DEV_IDX(id->driver_data); // HERE!!

                uncore_extra_pci_dev[pkg].dev[idx] = pdev;     // HERE!!
                pci_set_drvdata(pdev, NULL);
                return 0;
        }

Due to the overwriting, the following warning message are shown
while CPU hot-removing.

  WARNING: CPU: 126 PID: 6 at arch/x86/events/intel/uncore.c:988
  uncore_pci_remove+0x10b/0x150
  Call Trace:
   pci_device_remove+0x42/0xd0
   device_release_driver_internal+0x148/0x220
   pci_stop_bus_device+0x76/0xa0
   pci_stop_root_bus+0x44/0x60
   acpi_pci_root_remove+0x1f/0x80
   acpi_bus_trim+0x57/0x90
   acpi_bus_trim+0x2e/0x90
   acpi_device_hotplug+0x2bc/0x4b0
   acpi_hotplug_work_fn+0x1a/0x30
   process_one_work+0x174/0x3a0
   worker_thread+0x4c/0x3d0
   kthread+0xf8/0x130

To avoid the conflict, this patch changes the PCU.3 driver_data.
And also increase UNCORE_EXTRA_PCI_DEV_MAX to handle the new index.

Fixes: 15a3e845b01c ("perf/x86/intel/uncore: Fix SBOX support for Broadwell CPUs")

Signed-off-by: Masayoshi Mizuma <m.mizuma@...fujitsu.com>
---
 arch/x86/events/intel/uncore.h       | 2 +-
 arch/x86/events/intel/uncore_snbep.c | 7 ++++---
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/arch/x86/events/intel/uncore.h b/arch/x86/events/intel/uncore.h
index c9e1e0b..e17ab88 100644
--- a/arch/x86/events/intel/uncore.h
+++ b/arch/x86/events/intel/uncore.h
@@ -28,7 +28,7 @@
 #define UNCORE_PCI_DEV_TYPE(data)	((data >> 8) & 0xff)
 #define UNCORE_PCI_DEV_IDX(data)	(data & 0xff)
 #define UNCORE_EXTRA_PCI_DEV		0xff
-#define UNCORE_EXTRA_PCI_DEV_MAX	3
+#define UNCORE_EXTRA_PCI_DEV_MAX	4
 
 #define UNCORE_EVENT_CONSTRAINT(c, n) EVENT_CONSTRAINT(c, n, 0xff)
 
diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c
index 87dc026..62f007c 100644
--- a/arch/x86/events/intel/uncore_snbep.c
+++ b/arch/x86/events/intel/uncore_snbep.c
@@ -1030,6 +1030,7 @@ enum {
 	SNBEP_PCI_QPI_PORT0_FILTER,
 	SNBEP_PCI_QPI_PORT1_FILTER,
 	HSWEP_PCI_PCU_3,
+	BDX_PCI_PCU_3,
 };
 
 static int snbep_qpi_hw_config(struct intel_uncore_box *box, struct perf_event *event)
@@ -3070,11 +3071,11 @@ void bdx_uncore_cpu_init(void)
 	if (boot_cpu_data.x86_model == 86) {
 		uncore_msr_uncores[BDX_MSR_UNCORE_SBOX] = NULL;
 	/* Detect systems with no SBOXes */
-	} else if (uncore_extra_pci_dev[pkg].dev[HSWEP_PCI_PCU_3]) {
+	} else if (uncore_extra_pci_dev[pkg].dev[BDX_PCI_PCU_3]) {
 		struct pci_dev *pdev;
 		u32 capid4;
 
-		pdev = uncore_extra_pci_dev[pkg].dev[HSWEP_PCI_PCU_3];
+		pdev = uncore_extra_pci_dev[pkg].dev[BDX_PCI_PCU_3];
 		pci_read_config_dword(pdev, 0x94, &capid4);
 		if (((capid4 >> 6) & 0x3) == 0)
 			bdx_msr_uncores[BDX_MSR_UNCORE_SBOX] = NULL;
@@ -3299,7 +3300,7 @@ static const struct pci_device_id bdx_uncore_pci_ids[] = {
 	{ /* PCU.3 (for Capability registers) */
 		PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x6fc0),
 		.driver_data = UNCORE_PCI_DEV_DATA(UNCORE_EXTRA_PCI_DEV,
-						   HSWEP_PCI_PCU_3),
+						   BDX_PCI_PCU_3),
 	},
 	{ /* end: all zeroes */ }
 };
-- 
2.16.1