[PATCH v6 19/31] xen/arm: ITS: Export ITS info to Virtual ITS

[vijay.kilari@gmail.com]

From: Vijaya Kumar K <Vijaya.Kumar@caviumnetworks.com>

Export physical ITS information to virtual ITS driver

Signed-off-by: Vijaya Kumar K <Vijaya.Kumar@caviumnetworks.com>
---
v6: - Passed only one physical ITS info
    - Passed all the values as parameters
    - Initialize vITS only if physical ITS is available
---
 xen/arch/arm/gic-v3-its.c     |   11 +++++++++++
 xen/arch/arm/vgic-v3-its.c    |   28 ++++++++++++++++++++++++++++
 xen/include/asm-arm/gic-its.h |    7 +++++++
 3 files changed, 46 insertions(+)

diff --git a/xen/arch/arm/gic-v3-its.c b/xen/arch/arm/gic-v3-its.c
index 0865a93..77abbc6 100644
--- a/xen/arch/arm/gic-v3-its.c
+++ b/xen/arch/arm/gic-v3-its.c
@@ -94,6 +94,7 @@ static LIST_HEAD(its_nodes);
 static DEFINE_SPINLOCK(its_lock);
 static struct rdist_prop  *gic_rdists;
 static struct rb_root rb_its_dev;
+static struct gic_its_info its_data;
 static DEFINE_SPINLOCK(rb_its_dev_lock);
 
 #define gic_data_rdist()    (this_cpu(rdist))
@@ -1312,6 +1313,8 @@ static int its_probe(struct dt_device_node *node)
     its->phys_size = its_size;
     typer = readl_relaxed(its_base + GITS_TYPER);
     its->ite_size = ((typer >> 4) & 0xf) + 1;
+    its_data.eventid_bits = GITS_TYPER_IDBITS(typer);
+    its_data.dev_bits = GITS_TYPER_DEVBITS(typer);
 
     its->cmd_base = xzalloc_bytes(ITS_CMD_QUEUE_SZ);
     if ( !its->cmd_base )
@@ -1402,6 +1405,7 @@ int its_cpu_init(void)
 
 int __init its_init(struct rdist_prop *rdists)
 {
+    struct its_node *its;
     struct dt_device_node *np = NULL;
 
     static const struct dt_device_match its_device_ids[] __initconst =
@@ -1424,6 +1428,13 @@ int __init its_init(struct rdist_prop *rdists)
     its_alloc_lpi_tables();
     its_lpi_init(rdists->id_bits);
 
+    its = list_first_entry(&its_nodes, struct its_node, entry);
+    if ( !its )
+        return -ENOMEM;
+
+    vits_setup_hw(its_data.dev_bits, its_data.eventid_bits,
+                  its->phys_base, its->phys_size);
+
     return 0;
 }
 
diff --git a/xen/arch/arm/vgic-v3-its.c b/xen/arch/arm/vgic-v3-its.c
index cef6139..53f2a27 100644
--- a/xen/arch/arm/vgic-v3-its.c
+++ b/xen/arch/arm/vgic-v3-its.c
@@ -68,6 +68,26 @@ static inline uint16_t vits_get_max_collections(struct domain *d)
     return (d->max_vcpus + 1);
 }
 
+static struct {
+    bool_t enabled;
+    uint32_t dev_bits;
+    uint32_t eventid_bits;
+    /* GITS physical base */
+    paddr_t phys_base;
+    /* GITS physical size */
+    unsigned long phys_size;
+} vits_hw;
+
+void vits_setup_hw(uint32_t dev_bits, uint32_t eventid_bits,
+                   paddr_t phys_base, unsigned long phys_size)
+{
+    vits_hw.enabled = 1;
+    vits_hw.dev_bits = dev_bits;
+    vits_hw.eventid_bits = eventid_bits;
+    vits_hw.phys_base = phys_base;
+    vits_hw.phys_size = phys_size;
+}
+
 int vits_access_guest_table(struct domain *d, paddr_t entry, void *addr,
                             uint32_t size, bool_t set)
 {
@@ -547,6 +567,14 @@ int vits_domain_init(struct domain *d)
 
     ASSERT(is_hardware_domain(d));
 
+    if ( !vits_hw.enabled )
+    {
+        printk(XENLOG_G_ERR
+               "%"PRIu16": VITS is not supported on this platform.\n",
+               d->domain_id);
+        return -ENODEV;
+    }
+        
     d->arch.vgic.nr_lpis = nr_lpis;
 
     d->arch.vgic.vits = xzalloc(struct vgic_its);
diff --git a/xen/include/asm-arm/gic-its.h b/xen/include/asm-arm/gic-its.h
index 4327ba2..7077477 100644
--- a/xen/include/asm-arm/gic-its.h
+++ b/xen/include/asm-arm/gic-its.h
@@ -320,6 +320,11 @@ struct vitt {
     uint32_t vlpi;
 };
 
+struct gic_its_info {
+    uint32_t eventid_bits;
+    uint32_t dev_bits;
+};
+
 void irqdesc_set_lpi_event(struct irq_desc *desc, unsigned id);
 unsigned int irqdesc_get_lpi_event(struct irq_desc *desc);
 struct its_device *irqdesc_get_its_device(struct irq_desc *desc);
@@ -337,6 +342,8 @@ int vits_get_vitt_entry(struct domain *d, uint32_t devid,
                         uint32_t event, struct vitt *entry);
 int vits_get_vdevice_entry(struct domain *d, uint32_t devid,
                            struct vdevice_table *entry);
+void vits_setup_hw(uint32_t dev_bits, uint32_t eventid_bits,
+                   paddr_t base, unsigned long size);
 
 #endif /* __ASM_ARM_GIC_ITS_H__ */
 /*
-- 
1.7.9.5