[Xen-devel] [PATCH v2 1/3] x86/physdev: factor out the code to allocate and map a pirq

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

Move the code to allocate and map a domain pirq (either GSI or MSI) into the
x86 irq code base, so that it can be used outside of the physdev ops.

This change shouldn't affect the functionality of the already existing physdev
ops.

Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
Jan Beulich <jbeulich@xxxxxxxx>
Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
Changes since v1:
 - New in this version.
---
 xen/arch/x86/irq.c        | 175 ++++++++++++++++++++++++++++++++++++++++++++++
 xen/arch/x86/physdev.c    | 124 ++------------------------------
 xen/include/asm-x86/irq.h |   5 ++
 3 files changed, 185 insertions(+), 119 deletions(-)

diff --git a/xen/arch/x86/irq.c b/xen/arch/x86/irq.c
index 676ba5216f..8f6a91994c 100644
--- a/xen/arch/x86/irq.c
+++ b/xen/arch/x86/irq.c
@@ -2537,3 +2537,178 @@ bool_t hvm_domain_use_pirq(const struct domain *d, 
const struct pirq *pirq)
     return is_hvm_domain(d) && pirq &&
            pirq->arch.hvm.emuirq != IRQ_UNBOUND; 
 }
+
+int allocate_and_map_gsi_pirq(struct domain *d, int *index, int *pirq_p)
+{
+    int irq, pirq, ret;
+
+    if ( *index < 0 || *index >= nr_irqs_gsi )
+    {
+        dprintk(XENLOG_G_ERR, "dom%d: map invalid irq %d\n", d->domain_id,
+                *index);
+        return -EINVAL;
+    }
+
+    irq = domain_pirq_to_irq(current->domain, *index);
+    if ( irq <= 0 )
+    {
+        if ( is_hardware_domain(current->domain) )
+            irq = *index;
+        else {
+            dprintk(XENLOG_G_ERR, "dom%d: map pirq with incorrect irq!\n",
+                    d->domain_id);
+            return -EINVAL;
+        }
+    }
+
+    pcidevs_lock();
+    /* Verify or get pirq. */
+    spin_lock(&d->event_lock);
+    pirq = domain_irq_to_pirq(d, irq);
+
+    if ( *pirq_p < 0 )
+    {
+        if ( pirq )
+        {
+            dprintk(XENLOG_G_ERR, "dom%d: %d:%d already mapped to %d\n",
+                    d->domain_id, *index, *pirq_p, pirq);
+            if ( pirq < 0 )
+            {
+                ret = -EBUSY;
+                goto done;
+            }
+        }
+        else
+        {
+            pirq = get_free_pirq(d, MAP_PIRQ_TYPE_GSI);
+            if ( pirq < 0 )
+            {
+                dprintk(XENLOG_G_ERR, "dom%d: no free pirq\n", d->domain_id);
+                ret = pirq;
+                goto done;
+            }
+        }
+    }
+    else
+    {
+        if ( pirq && pirq != *pirq_p )
+        {
+            dprintk(XENLOG_G_ERR, "dom%d: pirq %d conflicts with irq %d\n",
+                    d->domain_id, *index, *pirq_p);
+            ret = -EEXIST;
+            goto done;
+        }
+        else
+            pirq = *pirq_p;
+    }
+
+    ret = map_domain_pirq(d, pirq, irq, MAP_PIRQ_TYPE_GSI, NULL);
+    if ( ret == 0 )
+        *pirq_p = pirq;
+
+ done:
+    spin_unlock(&d->event_lock);
+    pcidevs_unlock();
+    return ret;
+}
+
+int allocate_and_map_msi_pirq(struct domain *d, int *index, int *pirq_p,
+                              struct msi_info *msi)
+{
+    int irq, pirq, ret, type;
+
+    irq = *index;
+    if ( irq == -1 || msi->entry_nr > 1 )
+        irq = create_irq(NUMA_NO_NODE);
+
+    if ( irq < nr_irqs_gsi || irq >= nr_irqs )
+    {
+        dprintk(XENLOG_G_ERR, "dom%d: can't create irq for msi!\n",
+                d->domain_id);
+        ret = -EINVAL;
+        goto free_irq;
+    }
+
+    msi->irq = irq;
+    type = (msi->entry_nr > 1 && !msi->table_base) ? MAP_PIRQ_TYPE_MULTI_MSI
+                                                   : MAP_PIRQ_TYPE_MSI;
+
+    pcidevs_lock();
+    /* Verify or get pirq. */
+    spin_lock(&d->event_lock);
+    pirq = domain_irq_to_pirq(d, irq);
+    if ( *pirq_p < 0 )
+    {
+        if ( pirq )
+        {
+            dprintk(XENLOG_G_ERR, "dom%d: %d:%d already mapped to %d\n",
+                    d->domain_id, *index, *pirq_p, pirq);
+            if ( pirq < 0 )
+            {
+                ret = -EBUSY;
+                goto done;
+            }
+        }
+        else if ( msi->entry_nr > 1 && !msi->table_base )
+        {
+            if ( msi->entry_nr <= 0 || msi->entry_nr > 32 )
+                ret = -EDOM;
+            else if ( msi->entry_nr != 1 && !iommu_intremap )
+                ret = -EOPNOTSUPP;
+            else
+            {
+                while ( msi->entry_nr & (msi->entry_nr - 1) )
+                    msi->entry_nr += msi->entry_nr & -msi->entry_nr;
+                pirq = get_free_pirqs(d, msi->entry_nr);
+                ret = 0;
+                if ( pirq < 0 )
+                {
+                    while ( (msi->entry_nr >>= 1) > 1 )
+                        if ( get_free_pirqs(d, msi->entry_nr) > 0 )
+                            break;
+                    dprintk(XENLOG_G_ERR, "dom%d: no block of %d free pirqs\n",
+                            d->domain_id, msi->entry_nr << 1);
+                    ret = pirq;
+                }
+            }
+            if ( ret < 0 )
+                goto done;
+        }
+        else
+        {
+            pirq = get_free_pirq(d, type);
+            if ( pirq < 0 )
+            {
+                dprintk(XENLOG_G_ERR, "dom%d: no free pirq\n", d->domain_id);
+                ret = pirq;
+                goto done;
+            }
+        }
+    }
+    else
+    {
+        if ( pirq && pirq != *pirq_p )
+        {
+            dprintk(XENLOG_G_ERR, "dom%d: pirq %d conflicts with irq %d\n",
+                    d->domain_id, *index, *pirq_p);
+            ret = -EEXIST;
+            goto done;
+        }
+        else
+            pirq = *pirq_p;
+    }
+
+    ret = map_domain_pirq(d, pirq, irq, type, msi);
+    if ( ret == 0 )
+        *pirq_p = pirq;
+
+ done:
+    spin_unlock(&d->event_lock);
+    pcidevs_unlock();
+ free_irq:
+    if ( ret != 0 &&
+         ((msi->entry_nr > 1 && !msi->table_base) || *index == -1) )
+        destroy_irq(irq);
+    return ret;
+}
+
diff --git a/xen/arch/x86/physdev.c b/xen/arch/x86/physdev.c
index eec4a41231..b5eded4be9 100644
--- a/xen/arch/x86/physdev.c
+++ b/xen/arch/x86/physdev.c
@@ -92,8 +92,7 @@ int physdev_map_pirq(domid_t domid, int type, int *index, int 
*pirq_p,
                      struct msi_info *msi)
 {
     struct domain *d = current->domain;
-    int pirq, irq, ret = 0;
-    void *map_data = NULL;
+    int ret;
 
     if ( domid == DOMID_SELF && is_hvm_domain(d) && has_pirq(d) )
     {
@@ -119,135 +118,22 @@ int physdev_map_pirq(domid_t domid, int type, int 
*index, int *pirq_p,
     switch ( type )
     {
     case MAP_PIRQ_TYPE_GSI:
-        if ( *index < 0 || *index >= nr_irqs_gsi )
-        {
-            dprintk(XENLOG_G_ERR, "dom%d: map invalid irq %d\n",
-                    d->domain_id, *index);
-            ret = -EINVAL;
-            goto free_domain;
-        }
-
-        irq = domain_pirq_to_irq(current->domain, *index);
-        if ( irq <= 0 )
-        {
-            if ( is_hardware_domain(current->domain) )
-                irq = *index;
-            else {
-                dprintk(XENLOG_G_ERR, "dom%d: map pirq with incorrect irq!\n",
-                        d->domain_id);
-                ret = -EINVAL;
-                goto free_domain;
-            }
-        }
+        ret = allocate_and_map_gsi_pirq(d, index, pirq_p);
         break;
-
     case MAP_PIRQ_TYPE_MSI:
         if ( !msi->table_base )
             msi->entry_nr = 1;
-        irq = *index;
-        if ( irq == -1 )
+        /* fallthrough */
     case MAP_PIRQ_TYPE_MULTI_MSI:
-            irq = create_irq(NUMA_NO_NODE);
-
-        if ( irq < nr_irqs_gsi || irq >= nr_irqs )
-        {
-            dprintk(XENLOG_G_ERR, "dom%d: can't create irq for msi!\n",
-                    d->domain_id);
-            ret = -EINVAL;
-            goto free_domain;
-        }
-
-        msi->irq = irq;
-        map_data = msi;
+        ret = allocate_and_map_msi_pirq(d, index, pirq_p, msi);
         break;
-
     default:
         dprintk(XENLOG_G_ERR, "dom%d: wrong map_pirq type %x\n",
                 d->domain_id, type);
         ret = -EINVAL;
-        goto free_domain;
-    }
-
-    pcidevs_lock();
-    /* Verify or get pirq. */
-    spin_lock(&d->event_lock);
-    pirq = domain_irq_to_pirq(d, irq);
-    if ( *pirq_p < 0 )
-    {
-        if ( pirq )
-        {
-            dprintk(XENLOG_G_ERR, "dom%d: %d:%d already mapped to %d\n",
-                    d->domain_id, *index, *pirq_p, pirq);
-            if ( pirq < 0 )
-            {
-                ret = -EBUSY;
-                goto done;
-            }
-        }
-        else if ( type == MAP_PIRQ_TYPE_MULTI_MSI )
-        {
-            if ( msi->entry_nr <= 0 || msi->entry_nr > 32 )
-                ret = -EDOM;
-            else if ( msi->entry_nr != 1 && !iommu_intremap )
-                ret = -EOPNOTSUPP;
-            else
-            {
-                while ( msi->entry_nr & (msi->entry_nr - 1) )
-                    msi->entry_nr += msi->entry_nr & -msi->entry_nr;
-                pirq = get_free_pirqs(d, msi->entry_nr);
-                if ( pirq < 0 )
-                {
-                    while ( (msi->entry_nr >>= 1) > 1 )
-                        if ( get_free_pirqs(d, msi->entry_nr) > 0 )
-                            break;
-                    dprintk(XENLOG_G_ERR, "dom%d: no block of %d free pirqs\n",
-                            d->domain_id, msi->entry_nr << 1);
-                    ret = pirq;
-                }
-            }
-            if ( ret < 0 )
-                goto done;
-        }
-        else
-        {
-            pirq = get_free_pirq(d, type);
-            if ( pirq < 0 )
-            {
-                dprintk(XENLOG_G_ERR, "dom%d: no free pirq\n", d->domain_id);
-                ret = pirq;
-                goto done;
-            }
-        }
-    }
-    else
-    {
-        if ( pirq && pirq != *pirq_p )
-        {
-            dprintk(XENLOG_G_ERR, "dom%d: pirq %d conflicts with irq %d\n",
-                    d->domain_id, *index, *pirq_p);
-            ret = -EEXIST;
-            goto done;
-        }
-        else
-            pirq = *pirq_p;
+        break;
     }
 
-    ret = map_domain_pirq(d, pirq, irq, type, map_data);
-    if ( ret == 0 )
-        *pirq_p = pirq;
-
- done:
-    spin_unlock(&d->event_lock);
-    pcidevs_unlock();
-    if ( ret != 0 )
-        switch ( type )
-        {
-        case MAP_PIRQ_TYPE_MSI:
-            if ( *index == -1 )
-        case MAP_PIRQ_TYPE_MULTI_MSI:
-                destroy_irq(irq);
-            break;
-        }
  free_domain:
     rcu_unlock_domain(d);
     return ret;
diff --git a/xen/include/asm-x86/irq.h b/xen/include/asm-x86/irq.h
index ef625ebb13..2b1701e67b 100644
--- a/xen/include/asm-x86/irq.h
+++ b/xen/include/asm-x86/irq.h
@@ -200,4 +200,9 @@ bool_t cpu_has_pending_apic_eoi(void);
 
 static inline void arch_move_irqs(struct vcpu *v) { }
 
+struct msi_info;
+int allocate_and_map_gsi_pirq(struct domain *d, int *index, int *pirq_p);
+int allocate_and_map_msi_pirq(struct domain *d, int *index, int *pirq_p,
+                              struct msi_info *msi);
+
 #endif /* _ASM_HW_IRQ_H */
-- 
2.11.0 (Apple Git-81)


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