Re: [Qemu-devel] [PATCH 3/3] target-arm: Add the GICv2m to the virt board

[Peter Maydell]

On 8 April 2015 at 22:21, Christoffer Dall <address@hidden> wrote:

Adding the GICv2m to the virt board should allow us to enable MSIs on
the generic PCI host controller, in theory.

So is this commit message just saying "I haven't tested this

patchset" :-), or are we still missing some functionality to get

things working? (kernel or qemu?)

 

Signed-off-by: Christoffer Dall <address@hidden>
---
 hw/arm/virt.c | 47 ++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 46 insertions(+), 1 deletion(-)

diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index e01676a..0c8dae9 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -45,6 +45,7 @@
 #include "hw/pci-host/gpex.h"

 #define NUM_VIRTIO_TRANSPORTS 32
+#define NUM_GICV2M_SPIS 64

 /* Number of external interrupt lines to configure the GIC with */
 #define NUM_IRQS 128
@@ -71,6 +72,7 @@ enum {
     VIRT_RTC,
     VIRT_FW_CFG,
     VIRT_PCIE,
+    VIRT_GIC_V2M,
 };

 typedef struct MemMapEntry {
@@ -88,6 +90,7 @@ typedef struct VirtBoardInfo {
     int fdt_size;
     uint32_t clock_phandle;
     uint32_t gic_phandle;
+    uint32_t v2m_phandle;
 } VirtBoardInfo;

 typedef struct {
@@ -127,6 +130,7 @@ static const MemMapEntry a15memmap[] = {
     /* GIC distributor and CPU interfaces sit inside the CPU peripheral space */
     [VIRT_GIC_DIST] =   { 0x08000000, 0x00010000 },
     [VIRT_GIC_CPU] =    { 0x08010000, 0x00010000 },
+    [VIRT_GIC_V2M] =    { 0x08020000, 0x00001000 },
     [VIRT_UART] =       { 0x09000000, 0x00001000 },
     [VIRT_RTC] =        { 0x09010000, 0x00001000 },
     [VIRT_FW_CFG] =     { 0x09020000, 0x0000000a },
@@ -148,6 +152,7 @@ static const int a15irqmap[] = {
     [VIRT_RTC] = 2,
     [VIRT_PCIE] = 3, /* ... to 6 */
     [VIRT_MMIO] = 16, /* ...to 16 + NUM_VIRTIO_TRANSPORTS - 1 */
+    [VIRT_GIC_V2M] = 48, /* ...to 48 + NUM_GICV2M_SPIS - 1 */
 };

 static VirtBoardInfo machines[] = {
@@ -323,9 +328,21 @@ static void fdt_add_cpu_nodes(const VirtBoardInfo *vbi)
     }
 }

-static void fdt_add_gic_node(VirtBoardInfo *vbi)
+static void fdt_add_v2m_gic_node(VirtBoardInfo *vbi)
 {

+    vbi->v2m_phandle = qemu_fdt_alloc_phandle(vbi->fdt);
+    qemu_fdt_add_subnode(vbi->fdt, "/intc/v2m");
+    qemu_fdt_setprop_string(vbi->fdt, "/intc/v2m", "compatible",
+                            "arm,gic-v2m-frame");
+    qemu_fdt_setprop(vbi->fdt, "/intc/v2m", "msi-controller", NULL, 0);
+    qemu_fdt_setprop_sized_cells(vbi->fdt, "/intc/v2m", "reg",
+                                 2, vbi->memmap[VIRT_GIC_V2M].base,
+                                 2, vbi->memmap[VIRT_GIC_V2M].size);
+    qemu_fdt_setprop_cell(vbi->fdt, "/intc/v2m", "phandle", vbi->v2m_phandle);
+}

+static void fdt_add_gic_node(VirtBoardInfo *vbi)
+{
     vbi->gic_phandle = qemu_fdt_alloc_phandle(vbi->fdt);
     qemu_fdt_setprop_cell(vbi->fdt, "/", "interrupt-parent", vbi->gic_phandle);

@@ -340,9 +357,31 @@ static void fdt_add_gic_node(VirtBoardInfo *vbi)
                                      2, vbi->memmap[VIRT_GIC_DIST].size,
                                      2, vbi->memmap[VIRT_GIC_CPU].base,
                                      2, vbi->memmap[VIRT_GIC_CPU].size);
+    qemu_fdt_setprop_cell(vbi->fdt, "/intc", "#address-cells", 0x2);
+    qemu_fdt_setprop_cell(vbi->fdt, "/intc", "#size-cells", 0x2);
+    qemu_fdt_setprop(vbi->fdt, "/intc", "ranges", NULL, 0);

Why do we need an empty ranges attribute?

     qemu_fdt_setprop_cell(vbi->fdt, "/intc", "phandle", vbi->gic_phandle);
 }

+static void create_v2m(VirtBoardInfo *vbi, qemu_irq *pic)
+{
+    int i;
+    int irq = vbi->irqmap[VIRT_GIC_V2M];
+    DeviceState *dev;
+
+    dev = qdev_create(NULL, "gicv2m");
+    sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, vbi->memmap[VIRT_GIC_V2M].base);
+    qdev_prop_set_uint32(dev, "base-spi", irq);
+    qdev_prop_set_uint32(dev, "num-spi", NUM_GICV2M_SPIS);
+    qdev_init_nofail(dev);
+
+    for (i = 0; i < NUM_GICV2M_SPIS; i++) {
+        sysbus_connect_irq(SYS_BUS_DEVICE(dev), i, pic[irq + i]);
+    }
+
+    fdt_add_v2m_gic_node(vbi);
+}
+
 static void create_gic(VirtBoardInfo *vbi, qemu_irq *pic)
 {
     /* We create a standalone GIC v2 */
@@ -391,6 +430,8 @@ static void create_gic(VirtBoardInfo *vbi, qemu_irq *pic)
     }

     fdt_add_gic_node(vbi);
+
+    create_v2m(vbi, pic);
 }

 static void create_uart(const VirtBoardInfo *vbi, qemu_irq *pic)
@@ -699,6 +740,10 @@ static void create_pcie(const VirtBoardInfo *vbi, qemu_irq *pic)
     qemu_fdt_setprop_cell(vbi->fdt, nodename, "#size-cells", 2);
     qemu_fdt_setprop_cells(vbi->fdt, nodename, "bus-range", 0,
                            nr_pcie_buses - 1);
+    qemu_fdt_setprop_cells(vbi->fdt, nodename, "bus-range", 0,
+                           nr_pcie_buses - 1);

Merge conflict misresolution?

+
+    qemu_fdt_setprop_cells(vbi->fdt, nodename, "msi-parent", vbi->v2m_phandle);

     qemu_fdt_setprop_sized_cells(vbi->fdt, nodename, "reg",
                                  2, base_ecam, 2, size_ecam);
--
2.1.2.330.g565301e.dirty

thanks

-- PMM