Merge tag 'v4.4-rc2' into drm-intel-next-queued

Linux 4.4-rc2

Backmerge to get at

commit 1b0e3a049efe471c399674fd954500ce97438d30
Author: Imre Deak <imre.deak@intel.com>
Date:   Thu Nov 5 23:04:11 2015 +0200

    drm/i915/skl: disable display side power well support for now

so that we can proplery re-eanble skl power wells in -next.

Conflicts are just adjacent lines changed, except for intel_fbdev.c
where we need to interleave the changs. Nothing nefarious.

Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>

1 files changed, 71 insertions, 0 deletions

diff --git a/include/linux/kvm_irqfd.h b/include/linux/kvm_irqfd.h
new file mode 100644
index 000000000000..0c1de05098c8
--- /dev/null
+++ b/include/linux/kvm_irqfd.h
@@ -0,0 +1,71 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * irqfd: Allows an fd to be used to inject an interrupt to the guest
+ * Credit goes to Avi Kivity for the original idea.
+ */
+
+#ifndef __LINUX_KVM_IRQFD_H
+#define __LINUX_KVM_IRQFD_H
+
+#include <linux/kvm_host.h>
+#include <linux/poll.h>
+
+/*
+ * Resampling irqfds are a special variety of irqfds used to emulate
+ * level triggered interrupts.  The interrupt is asserted on eventfd
+ * trigger.  On acknowledgment through the irq ack notifier, the
+ * interrupt is de-asserted and userspace is notified through the
+ * resamplefd.  All resamplers on the same gsi are de-asserted
+ * together, so we don't need to track the state of each individual
+ * user.  We can also therefore share the same irq source ID.
+ */
+struct kvm_kernel_irqfd_resampler {
+        struct kvm *kvm;
+        /*
+         * List of resampling struct _irqfd objects sharing this gsi.
+         * RCU list modified under kvm->irqfds.resampler_lock
+         */
+        struct list_head list;
+        struct kvm_irq_ack_notifier notifier;
+        /*
+         * Entry in list of kvm->irqfd.resampler_list.  Use for sharing
+         * resamplers among irqfds on the same gsi.
+         * Accessed and modified under kvm->irqfds.resampler_lock
+         */
+        struct list_head link;
+};
+
+struct kvm_kernel_irqfd {
+        /* Used for MSI fast-path */
+        struct kvm *kvm;
+        wait_queue_t wait;
+        /* Update side is protected by irqfds.lock */
+        struct kvm_kernel_irq_routing_entry irq_entry;
+        seqcount_t irq_entry_sc;
+        /* Used for level IRQ fast-path */
+        int gsi;
+        struct work_struct inject;
+        /* The resampler used by this irqfd (resampler-only) */
+        struct kvm_kernel_irqfd_resampler *resampler;
+        /* Eventfd notified on resample (resampler-only) */
+        struct eventfd_ctx *resamplefd;
+        /* Entry in list of irqfds for a resampler (resampler-only) */
+        struct list_head resampler_link;
+        /* Used for setup/shutdown */
+        struct eventfd_ctx *eventfd;
+        struct list_head list;
+        poll_table pt;
+        struct work_struct shutdown;
+        struct irq_bypass_consumer consumer;
+        struct irq_bypass_producer *producer;
+};
+
+#endif /* __LINUX_KVM_IRQFD_H */