[Xen-devel] [PATCH v3 06/13] xen: arm64: Map xgene PCI memory regions and interrupts to dom0.

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Acked-by: Julien Grall <julien.grall@xxxxxxxxxx>
---
v3: Add a comment on why this is needed.
v2: This replaces "HACK: xen: arm: map PCI controller ranges region MMIOs to
dom0."
---
 xen/arch/arm/platforms/xgene-storm.c |   82 ++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)

diff --git a/xen/arch/arm/platforms/xgene-storm.c 
b/xen/arch/arm/platforms/xgene-storm.c
index f416da3..ea9b0f4 100644
--- a/xen/arch/arm/platforms/xgene-storm.c
+++ b/xen/arch/arm/platforms/xgene-storm.c
@@ -20,12 +20,93 @@
 
 #include <xen/config.h>
 #include <asm/platform.h>
+#include <asm/gic.h>
 
 static uint32_t xgene_storm_quirks(void)
 {
     return PLATFORM_QUIRK_DOM0_MAPPING_11|PLATFORM_QUIRK_GIC_64K_STRIDE;
 }
 
+static int map_one_mmio(struct domain *d, const char *what,
+                         paddr_t start, paddr_t end)
+{
+    int ret;
+
+    printk("Additional MMIO %"PRIpaddr"-%"PRIpaddr" (%s)\n",
+           start, end, what);
+    ret = map_mmio_regions(d, start, end, start);
+    if ( ret )
+        printk("Failed to map %s @ %"PRIpaddr" to dom%d\n",
+               what, start, d->domain_id);
+    return ret;
+}
+
+static int map_one_spi(struct domain *d, const char *what,
+                       unsigned int spi, unsigned int type)
+{
+    struct dt_irq irq;
+    int ret;
+
+    irq.type = type;
+
+    irq.irq = spi + 32; /* SPIs start at IRQ 32 */
+
+    printk("Additional IRQ %u (%s)\n", irq.irq, what);
+
+    ret = gic_route_irq_to_guest(d, &irq, what);
+    if ( ret )
+        printk("Failed to route %s to dom%d\n", what, d->domain_id);
+
+    return ret;
+}
+
+/*
+ * Xen does not currently support mapping MMIO regions and interrupt
+ * for bus child devices (referenced via the "ranges" and
+ * "interrupt-map" properties to domain 0). Instead for now map the
+ * necessary resources manually.
+ */
+static int xgene_storm_specific_mapping(struct domain *d)
+{
+    int ret;
+
+    /* Map the PCIe bus resources */
+    ret = map_one_mmio(d, "PCI MEM REGION", 0xe000000000UL, 0xe010000000UL);
+    if ( ret )
+        goto err;
+
+    ret = map_one_mmio(d, "PCI IO REGION", 0xe080000000UL, 0xe080010000UL);
+    if ( ret )
+        goto err;
+
+    ret = map_one_mmio(d, "PCI CFG REGION", 0xe0d0000000UL, 0xe0d0200000UL);
+    if ( ret )
+        goto err;
+    ret = map_one_mmio(d, "PCI MSI REGION", 0xe010000000UL, 0xe010800000UL);
+    if ( ret )
+        goto err;
+
+    ret = map_one_spi(d, "PCI#INTA", 0xc2, DT_IRQ_TYPE_LEVEL_HIGH);
+    if ( ret )
+        goto err;
+
+    ret = map_one_spi(d, "PCI#INTB", 0xc3, DT_IRQ_TYPE_LEVEL_HIGH);
+    if ( ret )
+        goto err;
+
+    ret = map_one_spi(d, "PCI#INTC", 0xc4, DT_IRQ_TYPE_LEVEL_HIGH);
+    if ( ret )
+        goto err;
+
+    ret = map_one_spi(d, "PCI#INTD", 0xc5, DT_IRQ_TYPE_LEVEL_HIGH);
+    if ( ret )
+        goto err;
+
+    ret = 0;
+err:
+    return ret;
+}
+
 
 static const char * const xgene_storm_dt_compat[] __initconst =
 {
@@ -36,6 +117,7 @@ static const char * const xgene_storm_dt_compat[] 
__initconst =
 PLATFORM_START(xgene_storm, "APM X-GENE STORM")
     .compatible = xgene_storm_dt_compat,
     .quirks = xgene_storm_quirks,
+    .specific_mapping = xgene_storm_specific_mapping,
     .dom0_evtchn_ppi = 24,
 PLATFORM_END
 
-- 
1.7.10.4


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