[Qemu-arm] [RFC 1/2] hw/arm/virt: Add a new 256MB ECAM region

[Eric Auger]

This patch defines a new ECAM region located after the 256GB limit.

The virt machine state is augmented with a new highmem_ecam field
which guards the usage of this new ECAM region instead of the legacy
16MB one. With the highmem ECAM region, up to 256 PCIe buses can be
used.

Signed-off-by: Eric Auger <address@hidden>
---
 hw/arm/virt-acpi-build.c | 22 ++++++++++++++--------
 hw/arm/virt.c            | 12 ++++++++----
 include/hw/arm/virt.h    |  2 ++
 3 files changed, 24 insertions(+), 12 deletions(-)

diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index 92ceee9..b72f041 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -150,16 +150,17 @@ static void acpi_dsdt_add_virtio(Aml *scope,
 }
 
 static void acpi_dsdt_add_pci(Aml *scope, const MemMapEntry *memmap,
-                              uint32_t irq, bool use_highmem)
+                              uint32_t irq, bool use_highmem, bool 
highmem_ecam)
 {
+    int ecam_id = highmem_ecam ? VIRT_PCIE_ECAM_HIGH : VIRT_PCIE_ECAM;
     Aml *method, *crs, *ifctx, *UUID, *ifctx1, *elsectx, *buf;
     int i, bus_no;
     hwaddr base_mmio = memmap[VIRT_PCIE_MMIO].base;
     hwaddr size_mmio = memmap[VIRT_PCIE_MMIO].size;
     hwaddr base_pio = memmap[VIRT_PCIE_PIO].base;
     hwaddr size_pio = memmap[VIRT_PCIE_PIO].size;
-    hwaddr base_ecam = memmap[VIRT_PCIE_ECAM].base;
-    hwaddr size_ecam = memmap[VIRT_PCIE_ECAM].size;
+    hwaddr base_ecam = memmap[ecam_id].base;
+    hwaddr size_ecam = memmap[ecam_id].size;
     int nr_pcie_buses = size_ecam / PCIE_MMCFG_SIZE_MIN;
 
     Aml *dev = aml_device("%s", "PCI0");
@@ -173,7 +174,7 @@ static void acpi_dsdt_add_pci(Aml *scope, const MemMapEntry 
*memmap,
     aml_append(dev, aml_name_decl("_CCA", aml_int(1)));
 
     /* Declare the PCI Routing Table. */
-    Aml *rt_pkg = aml_package(nr_pcie_buses * PCI_NUM_PINS);
+    Aml *rt_pkg = aml_varpackage(nr_pcie_buses * PCI_NUM_PINS);
     for (bus_no = 0; bus_no < nr_pcie_buses; bus_no++) {
         for (i = 0; i < PCI_NUM_PINS; i++) {
             int gsi = (i + bus_no) % PCI_NUM_PINS;
@@ -316,10 +317,14 @@ static void acpi_dsdt_add_pci(Aml *scope, const 
MemMapEntry *memmap,
     Aml *dev_res0 = aml_device("%s", "RES0");
     aml_append(dev_res0, aml_name_decl("_HID", aml_string("PNP0C02")));
     crs = aml_resource_template();
-    aml_append(crs, aml_memory32_fixed(base_ecam, size_ecam, AML_READ_WRITE));
+    aml_append(crs,
+        aml_qword_memory(AML_POS_DECODE, AML_MIN_FIXED, AML_MAX_FIXED,
+                         AML_NON_CACHEABLE, AML_READ_WRITE, 0x0000, base_ecam,
+                         base_ecam + size_ecam - 1, 0x0000, size_ecam));
     aml_append(dev_res0, aml_name_decl("_CRS", crs));
     aml_append(dev, dev_res0);
     aml_append(scope, dev);
+
 }
 
 static void acpi_dsdt_add_gpio(Aml *scope, const MemMapEntry *gpio_memmap,
@@ -563,16 +568,17 @@ build_mcfg(GArray *table_data, BIOSLinker *linker, 
VirtMachineState *vms)
 {
     AcpiTableMcfg *mcfg;
     const MemMapEntry *memmap = vms->memmap;
+    int ecam_id = vms->highmem_ecam ? VIRT_PCIE_ECAM_HIGH : VIRT_PCIE_ECAM;
     int len = sizeof(*mcfg) + sizeof(mcfg->allocation[0]);
     int mcfg_start = table_data->len;
 
     mcfg = acpi_data_push(table_data, len);
-    mcfg->allocation[0].address = cpu_to_le64(memmap[VIRT_PCIE_ECAM].base);
+    mcfg->allocation[0].address = cpu_to_le64(memmap[ecam_id].base);
 
     /* Only a single allocation so no need to play with segments */
     mcfg->allocation[0].pci_segment = cpu_to_le16(0);
     mcfg->allocation[0].start_bus_number = 0;
-    mcfg->allocation[0].end_bus_number = (memmap[VIRT_PCIE_ECAM].size
+    mcfg->allocation[0].end_bus_number = (memmap[ecam_id].size
                                           / PCIE_MMCFG_SIZE_MIN) - 1;
 
     build_header(linker, table_data, (void *)(table_data->data + mcfg_start),
@@ -747,7 +753,7 @@ build_dsdt(GArray *table_data, BIOSLinker *linker, 
VirtMachineState *vms)
     acpi_dsdt_add_virtio(scope, &memmap[VIRT_MMIO],
                     (irqmap[VIRT_MMIO] + ARM_SPI_BASE), NUM_VIRTIO_TRANSPORTS);
     acpi_dsdt_add_pci(scope, memmap, (irqmap[VIRT_PCIE] + ARM_SPI_BASE),
-                      vms->highmem);
+                      vms->highmem, vms->highmem_ecam);
     acpi_dsdt_add_gpio(scope, &memmap[VIRT_GPIO],
                        (irqmap[VIRT_GPIO] + ARM_SPI_BASE));
     acpi_dsdt_add_power_button(scope);
diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index a3a28e2..a35550b 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -149,6 +149,7 @@ static const MemMapEntry a15memmap[] = {
     [VIRT_PCIE_PIO] =           { 0x3eff0000, 0x00010000 },
     [VIRT_PCIE_ECAM] =          { 0x3f000000, 0x01000000 },
     [VIRT_MEM] =                { 0x40000000, RAMLIMIT_BYTES },
+    [VIRT_PCIE_ECAM_HIGH] =     { 0x4010000000ULL, 0x10000000 },
     /* Second PCIe window, 512GB wide at the 512GB boundary */
     [VIRT_PCIE_MMIO_HIGH] =   { 0x8000000000ULL, 0x8000000000ULL },
 };
@@ -1001,10 +1002,9 @@ static void create_pcie(VirtMachineState *vms, qemu_irq 
*pic)
     hwaddr size_mmio_high = vms->memmap[VIRT_PCIE_MMIO_HIGH].size;
     hwaddr base_pio = vms->memmap[VIRT_PCIE_PIO].base;
     hwaddr size_pio = vms->memmap[VIRT_PCIE_PIO].size;
-    hwaddr base_ecam = vms->memmap[VIRT_PCIE_ECAM].base;
-    hwaddr size_ecam = vms->memmap[VIRT_PCIE_ECAM].size;
+    hwaddr base_ecam, size_ecam;
     hwaddr base = base_mmio;
-    int nr_pcie_buses = size_ecam / PCIE_MMCFG_SIZE_MIN;
+    int nr_pcie_buses;
     int irq = vms->irqmap[VIRT_PCIE];
     MemoryRegion *mmio_alias;
     MemoryRegion *mmio_reg;
@@ -1012,12 +1012,16 @@ static void create_pcie(VirtMachineState *vms, qemu_irq 
*pic)
     MemoryRegion *ecam_reg;
     DeviceState *dev;
     char *nodename;
-    int i;
+    int i, ecam_memmap_id;
     PCIHostState *pci;
 
     dev = qdev_create(NULL, TYPE_GPEX_HOST);
     qdev_init_nofail(dev);
 
+    ecam_memmap_id = vms->highmem ? VIRT_PCIE_ECAM_HIGH : VIRT_PCIE_ECAM;
+    base_ecam = vms->memmap[ecam_memmap_id].base;
+    size_ecam = vms->memmap[ecam_memmap_id].size;
+    nr_pcie_buses = size_ecam / PCIE_MMCFG_SIZE_MIN;
     /* Map only the first size_ecam bytes of ECAM space */
     ecam_alias = g_new0(MemoryRegion, 1);
     ecam_reg = sysbus_mmio_get_region(SYS_BUS_DEVICE(dev), 0);
diff --git a/include/hw/arm/virt.h b/include/hw/arm/virt.h
index 4ac7ef6..e9423a7 100644
--- a/include/hw/arm/virt.h
+++ b/include/hw/arm/virt.h
@@ -69,6 +69,7 @@ enum {
     VIRT_PCIE_MMIO,
     VIRT_PCIE_PIO,
     VIRT_PCIE_ECAM,
+    VIRT_PCIE_ECAM_HIGH,
     VIRT_PLATFORM_BUS,
     VIRT_PCIE_MMIO_HIGH,
     VIRT_GPIO,
@@ -103,6 +104,7 @@ typedef struct {
     FWCfgState *fw_cfg;
     bool secure;
     bool highmem;
+    bool highmem_ecam;
     bool its;
     bool virt;
     int32_t gic_version;
-- 
2.5.5