replace d->nr_pirqs sized arrays with radix tree

With this it is questionable whether retaining struct domain's
nr_pirqs is actually necessary - the value now only serves for bounds
checking, and this boundary could easily be nr_irqs.

Note that ia64, the build of which is broken currently anyway, is only
being partially fixed up.

v2: adjustments for split setup/teardown of translation data

v3: re-sync with radix tree implementation changes

Signed-off-by: Jan Beulich <jbeulich@novell.com>

7 files changed, 73 insertions, 26 deletions

diff --git a/xen/include/xen/domain.h b/xen/include/xen/domain.h
index ddebbe14a9..765e1328fa 100644
--- a/xen/include/xen/domain.h
+++ b/xen/include/xen/domain.h
@@ -38,6 +38,12 @@ struct vcpu_guest_context *alloc_vcpu_guest_context(void);
 void free_vcpu_guest_context(struct vcpu_guest_context *);
 #endif
 
+/* Allocate/free a PIRQ structure. */
+#ifndef alloc_pirq_struct
+struct pirq *alloc_pirq_struct(struct domain *);
+#endif
+void free_pirq_struct(void *);
+
 /*
  * Initialise/destroy arch-specific details of a VCPU.
  *  - vcpu_initialise() is called after the basic generic fields of the
diff --git a/xen/include/xen/event.h b/xen/include/xen/event.h
index f39207c8d0..257cb3a5f0 100644
--- a/xen/include/xen/event.h
+++ b/xen/include/xen/event.h
@@ -36,7 +36,7 @@ void send_guest_global_virq(struct domain *d, int virq);
  *  @pirq:     Physical IRQ number
  * Returns TRUE if the delivery port was already pending.
  */
-int send_guest_pirq(struct domain *d, int pirq);
+int send_guest_pirq(struct domain *, const struct pirq *);
 
 /* Send a notification from a given domain's event-channel port. */
 int evtchn_send(struct domain *d, unsigned int lport);
diff --git a/xen/include/xen/hvm/irq.h b/xen/include/xen/hvm/irq.h
index e20cdcf1a8..b91c48de9b 100644
--- a/xen/include/xen/hvm/irq.h
+++ b/xen/include/xen/hvm/irq.h
@@ -25,7 +25,7 @@
 #include <xen/types.h>
 #include <xen/spinlock.h>
 #include <xen/tasklet.h>
-#include <asm/irq.h>
+#include <xen/timer.h>
 #include <public/hvm/save.h>
 
 struct dev_intx_gsi_link {
@@ -38,11 +38,15 @@ struct dev_intx_gsi_link {
 
 #define _HVM_IRQ_DPCI_MACH_PCI_SHIFT            0
 #define _HVM_IRQ_DPCI_MACH_MSI_SHIFT            1
+#define _HVM_IRQ_DPCI_MAPPED_SHIFT              2
+#define _HVM_IRQ_DPCI_EOI_LATCH_SHIFT           3
 #define _HVM_IRQ_DPCI_GUEST_PCI_SHIFT           4
 #define _HVM_IRQ_DPCI_GUEST_MSI_SHIFT           5
 #define _HVM_IRQ_DPCI_TRANSLATE_SHIFT          15
 #define HVM_IRQ_DPCI_MACH_PCI        (1 << _HVM_IRQ_DPCI_MACH_PCI_SHIFT)
 #define HVM_IRQ_DPCI_MACH_MSI        (1 << _HVM_IRQ_DPCI_MACH_MSI_SHIFT)
+#define HVM_IRQ_DPCI_MAPPED          (1 << _HVM_IRQ_DPCI_MAPPED_SHIFT)
+#define HVM_IRQ_DPCI_EOI_LATCH       (1 << _HVM_IRQ_DPCI_EOI_LATCH_SHIFT)
 #define HVM_IRQ_DPCI_GUEST_PCI       (1 << _HVM_IRQ_DPCI_GUEST_PCI_SHIFT)
 #define HVM_IRQ_DPCI_GUEST_MSI       (1 << _HVM_IRQ_DPCI_GUEST_MSI_SHIFT)
 #define HVM_IRQ_DPCI_TRANSLATE       (1 << _HVM_IRQ_DPCI_TRANSLATE_SHIFT)
@@ -63,14 +67,6 @@ struct hvm_gmsi_info {
     int dest_vcpu_id; /* -1 :multi-dest, non-negative: dest_vcpu_id */
 };
 
-struct hvm_mirq_dpci_mapping {
-    uint32_t flags;
-    int pending;
-    struct list_head digl_list;
-    struct domain *dom;
-    struct hvm_gmsi_info gmsi;
-};
-
 struct hvm_girq_dpci_mapping {
     struct list_head list;
     uint8_t device;
@@ -88,20 +84,33 @@ struct hvm_girq_dpci_mapping {
 
 /* Protected by domain's event_lock */
 struct hvm_irq_dpci {
-    /* Machine IRQ to guest device/intx mapping. */
-    unsigned long *mapping;
-    struct hvm_mirq_dpci_mapping *mirq;
-    unsigned long *dirq_mask;
     /* Guest IRQ to guest device/intx mapping. */
     struct list_head girq[NR_HVM_IRQS];
     /* Record of mapped ISA IRQs */
     DECLARE_BITMAP(isairq_map, NR_ISAIRQS);
     /* Record of mapped Links */
     uint8_t link_cnt[NR_LINK];
-    struct timer *hvm_timer;
     struct tasklet dirq_tasklet;
 };
 
+/* Machine IRQ to guest device/intx mapping. */
+struct hvm_pirq_dpci {
+    uint32_t flags;
+    bool_t masked;
+    uint16_t pending;
+    struct list_head digl_list;
+    struct domain *dom;
+    struct hvm_gmsi_info gmsi;
+    struct timer timer;
+};
+
+void pt_pirq_init(struct domain *, struct hvm_pirq_dpci *);
+bool_t pt_pirq_cleanup_check(struct hvm_pirq_dpci *);
+int pt_pirq_iterate(struct domain *d,
+                    int (*cb)(struct domain *,
+                              struct hvm_pirq_dpci *, void *arg),
+                    void *arg);
+
 /* Modify state of a PCI INTx wire. */
 void hvm_pci_intx_assert(
     struct domain *d, unsigned int device, unsigned int intx);
diff --git a/xen/include/xen/iommu.h b/xen/include/xen/iommu.h
index d4c94d0c16..a8a60f9ae3 100644
--- a/xen/include/xen/iommu.h
+++ b/xen/include/xen/iommu.h
@@ -88,7 +88,9 @@ int iommu_unmap_page(struct domain *d, unsigned long gfn);
 void iommu_pte_flush(struct domain *d, u64 gfn, u64 *pte, int order, int present);
 void iommu_set_pgd(struct domain *d);
 void iommu_domain_teardown(struct domain *d);
-int hvm_do_IRQ_dpci(struct domain *d, unsigned int irq);
+
+struct pirq;
+int hvm_do_IRQ_dpci(struct domain *, struct pirq *);
 int dpci_ioport_intercept(ioreq_t *p);
 int pt_irq_create_bind_vtd(struct domain *d,
                            xen_domctl_bind_pt_irq_t *pt_irq_bind);
diff --git a/xen/include/xen/irq.h b/xen/include/xen/irq.h
index 02456e4a80..b771fa2d75 100644
--- a/xen/include/xen/irq.h
+++ b/xen/include/xen/irq.h
@@ -3,6 +3,7 @@
 
 #include <xen/config.h>
 #include <xen/cpumask.h>
+#include <xen/rcupdate.h>
 #include <xen/spinlock.h>
 #include <xen/time.h>
 #include <xen/list.h>
@@ -135,13 +136,42 @@ extern void no_action(int cpl, void *dev_id, struct cpu_user_regs *regs);
 
 struct domain;
 struct vcpu;
-extern int pirq_guest_eoi(struct domain *d, int irq);
+
+struct pirq {
+    int pirq;
+    u16 evtchn;
+    bool_t masked;
+    struct rcu_head rcu_head;
+    struct arch_pirq arch;
+};
+
+#define pirq_info(d, p) ((struct pirq *)radix_tree_lookup(&(d)->pirq_tree, p))
+
+/* Use this instead of pirq_info() if the structure may need allocating. */
+extern struct pirq *pirq_get_info(struct domain *, int pirq);
+
+#define pirq_field(d, p, f) ({ \
+    const struct pirq *__pi = pirq_info(d, p); \
+    __pi ? __pi->f : 0; \
+})
+#define pirq_to_evtchn(d, pirq) pirq_field(d, pirq, evtchn)
+#define pirq_masked(d, pirq) pirq_field(d, pirq, masked)
+
+void pirq_cleanup_check(struct pirq *, struct domain *);
+
+#define pirq_cleanup_check(pirq, d) \
+    ((pirq)->evtchn ? pirq_cleanup_check(pirq, d) : (void)0)
+
+extern void pirq_guest_eoi(struct domain *, struct pirq *);
+extern void desc_guest_eoi(struct domain *, struct irq_desc *, struct pirq *);
 extern int pirq_guest_unmask(struct domain *d);
-extern int pirq_guest_bind(struct vcpu *v, int irq, int will_share);
-extern void pirq_guest_unbind(struct domain *d, int irq);
+extern int pirq_guest_bind(struct vcpu *, struct pirq *, int will_share);
+extern void pirq_guest_unbind(struct domain *d, struct pirq *);
 extern void pirq_set_affinity(struct domain *d, int irq, const cpumask_t *);
 extern irq_desc_t *domain_spin_lock_irq_desc(
     struct domain *d, int irq, unsigned long *pflags);
+extern irq_desc_t *pirq_spin_lock_irq_desc(
+    struct domain *, const struct pirq *, unsigned long *pflags);
 
 static inline void set_native_irq_info(unsigned int irq, const cpumask_t *mask)
 {
diff --git a/xen/include/xen/pci.h b/xen/include/xen/pci.h
index 79082d1721..49eabbcd49 100644
--- a/xen/include/xen/pci.h
+++ b/xen/include/xen/pci.h
@@ -117,8 +117,9 @@ int pci_find_cap_offset(u8 bus, u8 dev, u8 func, u8 cap);
 int pci_find_next_cap(u8 bus, unsigned int devfn, u8 pos, int cap);
 int pci_find_ext_capability(int seg, int bus, int devfn, int cap);
 
-int msixtbl_pt_register(struct domain *d, int pirq, uint64_t gtable);
-void msixtbl_pt_unregister(struct domain *d, int pirq);
+struct pirq;
+int msixtbl_pt_register(struct domain *, struct pirq *, uint64_t gtable);
+void msixtbl_pt_unregister(struct domain *, struct pirq *);
 void msixtbl_pt_cleanup(struct domain *d);
 void pci_enable_acs(struct pci_dev *pdev);
 
diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h
index e3eab706a3..902cd07418 100644
--- a/xen/include/xen/sched.h
+++ b/xen/include/xen/sched.h
@@ -12,6 +12,7 @@
 #include <xen/rcupdate.h>
 #include <xen/cpumask.h>
 #include <xen/nodemask.h>
+#include <xen/radix-tree.h>
 #include <xen/multicall.h>
 #include <public/xen.h>
 #include <public/domctl.h>
@@ -227,13 +228,11 @@ struct domain
     struct grant_table *grant_table;
 
     /*
-     * Interrupt to event-channel mappings. Updates should be protected by the 
-     * domain's event-channel spinlock. Read accesses can also synchronise on 
-     * the lock, but races don't usually matter.
+     * Interrupt to event-channel mappings and other per-guest-pirq data.
+     * Protected by the domain's event-channel spinlock.
      */
     unsigned int     nr_pirqs;
-    u16             *pirq_to_evtchn;
-    unsigned long   *pirq_mask;
+    struct radix_tree_root pirq_tree;
 
     /* I/O capabilities (access to IRQs and memory-mapped I/O). */
     struct rangeset *iomem_caps;