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Date: Sun, 25 Feb 2018 20:38:25 +0100 (CET)
From: Thomas Gleixner <tglx@...utronix.de>
To: Linus Torvalds <torvalds@...ux-foundation.org>
cc: LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...nel.org>
Subject: [GIT pull] x86 fixes for 4.16
Linus,
please pull the latest x86-urgent-for-linus git tree from:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86-urgent-for-linus
A small set of fixes:
- UAPI data type correction for hyperv
- Correct the cpu cores field in /proc/cpuinfo on CPU hotplug
- Return proper error code in the resctrl file system failure path to avoid silent
subsequent failures
- Correct a subtle accounting issue in the new vector allocation code
which went unnoticed for a while and caused suspend/resume failures
Thanks,
tglx
------------------>
Dou Liyang (1):
x86/topology: Fix function name in documentation
KarimAllah Ahmed (1):
x86/headers/UAPI: Use __u64 instead of u64 in <uapi/asm/hyperv.h>
Samuel Neves (1):
x86/topology: Update the 'cpu cores' field in /proc/cpuinfo correctly across CPU hotplug operations
Thomas Gleixner (2):
genirq/matrix: Handle CPU offlining proper
x86/apic/vector: Handle vector release on CPU unplug correctly
Wang Hui (1):
x86/intel_rdt: Fix incorrect returned value when creating rdgroup sub-directory in resctrl file system
Documentation/x86/topology.txt | 2 +-
arch/x86/include/uapi/asm/hyperv.h | 18 +++++++++---------
arch/x86/kernel/apic/vector.c | 25 ++++++++++++++++++++++---
arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | 1 +
arch/x86/kernel/smpboot.c | 1 +
kernel/irq/matrix.c | 23 ++++++++++++++---------
6 files changed, 48 insertions(+), 22 deletions(-)
diff --git a/Documentation/x86/topology.txt b/Documentation/x86/topology.txt
index f3e9d7e9ed6c..2953e3ec9a02 100644
--- a/Documentation/x86/topology.txt
+++ b/Documentation/x86/topology.txt
@@ -108,7 +108,7 @@ The topology of a system is described in the units of:
The number of online threads is also printed in /proc/cpuinfo "siblings."
- - topology_sibling_mask():
+ - topology_sibling_cpumask():
The cpumask contains all online threads in the core to which a thread
belongs.
diff --git a/arch/x86/include/uapi/asm/hyperv.h b/arch/x86/include/uapi/asm/hyperv.h
index 197c2e6c7376..099414345865 100644
--- a/arch/x86/include/uapi/asm/hyperv.h
+++ b/arch/x86/include/uapi/asm/hyperv.h
@@ -241,24 +241,24 @@
#define HV_X64_MSR_REENLIGHTENMENT_CONTROL 0x40000106
struct hv_reenlightenment_control {
- u64 vector:8;
- u64 reserved1:8;
- u64 enabled:1;
- u64 reserved2:15;
- u64 target_vp:32;
+ __u64 vector:8;
+ __u64 reserved1:8;
+ __u64 enabled:1;
+ __u64 reserved2:15;
+ __u64 target_vp:32;
};
#define HV_X64_MSR_TSC_EMULATION_CONTROL 0x40000107
#define HV_X64_MSR_TSC_EMULATION_STATUS 0x40000108
struct hv_tsc_emulation_control {
- u64 enabled:1;
- u64 reserved:63;
+ __u64 enabled:1;
+ __u64 reserved:63;
};
struct hv_tsc_emulation_status {
- u64 inprogress:1;
- u64 reserved:63;
+ __u64 inprogress:1;
+ __u64 reserved:63;
};
#define HV_X64_MSR_HYPERCALL_ENABLE 0x00000001
diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c
index 3cc471beb50b..bb6f7a2148d7 100644
--- a/arch/x86/kernel/apic/vector.c
+++ b/arch/x86/kernel/apic/vector.c
@@ -134,21 +134,40 @@ static void apic_update_vector(struct irq_data *irqd, unsigned int newvec,
{
struct apic_chip_data *apicd = apic_chip_data(irqd);
struct irq_desc *desc = irq_data_to_desc(irqd);
+ bool managed = irqd_affinity_is_managed(irqd);
lockdep_assert_held(&vector_lock);
trace_vector_update(irqd->irq, newvec, newcpu, apicd->vector,
apicd->cpu);
- /* Setup the vector move, if required */
- if (apicd->vector && cpu_online(apicd->cpu)) {
+ /*
+ * If there is no vector associated or if the associated vector is
+ * the shutdown vector, which is associated to make PCI/MSI
+ * shutdown mode work, then there is nothing to release. Clear out
+ * prev_vector for this and the offlined target case.
+ */
+ apicd->prev_vector = 0;
+ if (!apicd->vector || apicd->vector == MANAGED_IRQ_SHUTDOWN_VECTOR)
+ goto setnew;
+ /*
+ * If the target CPU of the previous vector is online, then mark
+ * the vector as move in progress and store it for cleanup when the
+ * first interrupt on the new vector arrives. If the target CPU is
+ * offline then the regular release mechanism via the cleanup
+ * vector is not possible and the vector can be immediately freed
+ * in the underlying matrix allocator.
+ */
+ if (cpu_online(apicd->cpu)) {
apicd->move_in_progress = true;
apicd->prev_vector = apicd->vector;
apicd->prev_cpu = apicd->cpu;
} else {
- apicd->prev_vector = 0;
+ irq_matrix_free(vector_matrix, apicd->cpu, apicd->vector,
+ managed);
}
+setnew:
apicd->vector = newvec;
apicd->cpu = newcpu;
BUG_ON(!IS_ERR_OR_NULL(per_cpu(vector_irq, newcpu)[newvec]));
diff --git a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
index bdab7d2f51af..fca759d272a1 100644
--- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
+++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
@@ -1804,6 +1804,7 @@ static int rdtgroup_mkdir_ctrl_mon(struct kernfs_node *parent_kn,
goto out_common_fail;
}
closid = ret;
+ ret = 0;
rdtgrp->closid = closid;
list_add(&rdtgrp->rdtgroup_list, &rdt_all_groups);
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 9eee25d07586..ff99e2b6fc54 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1437,6 +1437,7 @@ static void remove_siblinginfo(int cpu)
cpumask_clear(topology_sibling_cpumask(cpu));
cpumask_clear(topology_core_cpumask(cpu));
c->cpu_core_id = 0;
+ c->booted_cores = 0;
cpumask_clear_cpu(cpu, cpu_sibling_setup_mask);
recompute_smt_state();
}
diff --git a/kernel/irq/matrix.c b/kernel/irq/matrix.c
index 5187dfe809ac..4c5770407031 100644
--- a/kernel/irq/matrix.c
+++ b/kernel/irq/matrix.c
@@ -16,6 +16,7 @@ struct cpumap {
unsigned int available;
unsigned int allocated;
unsigned int managed;
+ bool initialized;
bool online;
unsigned long alloc_map[IRQ_MATRIX_SIZE];
unsigned long managed_map[IRQ_MATRIX_SIZE];
@@ -81,9 +82,11 @@ void irq_matrix_online(struct irq_matrix *m)
BUG_ON(cm->online);
- bitmap_zero(cm->alloc_map, m->matrix_bits);
- cm->available = m->alloc_size - (cm->managed + m->systembits_inalloc);
- cm->allocated = 0;
+ if (!cm->initialized) {
+ cm->available = m->alloc_size;
+ cm->available -= cm->managed + m->systembits_inalloc;
+ cm->initialized = true;
+ }
m->global_available += cm->available;
cm->online = true;
m->online_maps++;
@@ -370,14 +373,16 @@ void irq_matrix_free(struct irq_matrix *m, unsigned int cpu,
if (WARN_ON_ONCE(bit < m->alloc_start || bit >= m->alloc_end))
return;
- if (cm->online) {
- clear_bit(bit, cm->alloc_map);
- cm->allocated--;
+ clear_bit(bit, cm->alloc_map);
+ cm->allocated--;
+
+ if (cm->online)
m->total_allocated--;
- if (!managed) {
- cm->available++;
+
+ if (!managed) {
+ cm->available++;
+ if (cm->online)
m->global_available++;
- }
}
trace_irq_matrix_free(bit, cpu, m, cm);
}
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