[Qemu-devel] [PATCH v6 21/22] hw/arm/virt-acpi-build: Add PCIe controller in ACPI DSDT table

[Shannon Zhao]

From: Shannon Zhao <address@hidden>

Add PCIe controller in ACPI DSDT table, so the guest can detect
the PCIe.

Signed-off-by: Shannon Zhao <address@hidden>
Signed-off-by: Shannon Zhao <address@hidden>
---
 hw/arm/virt-acpi-build.c | 152 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 152 insertions(+)

diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index ceea689..002e004 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -41,6 +41,8 @@
 #include "hw/loader.h"
 #include "hw/hw.h"
 #include "hw/acpi/aml-build.h"
+#include "hw/pci/pcie_host.h"
+#include "hw/pci/pci.h"
 
 typedef struct VirtAcpiCpuInfo {
     DECLARE_BITMAP(found_cpus, VIRT_ACPI_CPU_ID_LIMIT);
@@ -152,6 +154,154 @@ static void acpi_dsdt_add_virtio(Aml *scope, const MemMap 
*virtio_mmio_memmap,
     }
 }
 
+static void acpi_dsdt_add_pci(Aml *scope, AcpiPcieInfo *info)
+{
+    Aml *method, *crs, *ifctx, *UUID, *ifctx1, *elsectx, *buf;
+    int i, bus_no;
+    int irq = *info->pcie_irq + 32;
+
+    Aml *dev = aml_device("%s", "PCI0");
+    aml_append(dev, aml_name_decl("_HID", aml_string("PNP0A08")));
+    aml_append(dev, aml_name_decl("_CID", aml_string("PNP0A03")));
+    aml_append(dev, aml_name_decl("_SEG", aml_int(0)));
+    aml_append(dev, aml_name_decl("_BBN", aml_int(0)));
+    aml_append(dev, aml_name_decl("_ADR", aml_int(0)));
+    aml_append(dev, aml_name_decl("_UID", aml_string("PCI0")));
+    aml_append(dev, aml_name_decl("_STR", aml_unicode("PCIe 0 Device")));
+
+    /* Declare the PCI Routing Table. */
+    Aml *rt_pkg = aml_package(info->nr_pcie_buses * PCI_NUM_PINS);
+    for (bus_no = 0; bus_no < info->nr_pcie_buses; bus_no++) {
+        for (i = 0; i < PCI_NUM_PINS; i++) {
+            int gsi = (i + bus_no) % PCI_NUM_PINS;
+            Aml *pkg = aml_package(4);
+            aml_append(pkg, aml_int((bus_no << 16) | 0xFFFF));
+            aml_append(pkg, aml_int(i));
+            aml_append(pkg, aml_name("GSI%d", gsi));
+            aml_append(pkg, aml_int(0));
+            aml_append(rt_pkg, pkg);
+        }
+    }
+    aml_append(dev, aml_name_decl("_PRT", rt_pkg));
+
+    /* Create GSI link device */
+    for (i = 0; i < PCI_NUM_PINS; i++) {
+        Aml *dev_gsi = aml_device("GSI%d", i);
+        aml_append(dev_gsi, aml_name_decl("_HID", aml_string("PNP0C0F")));
+        aml_append(dev_gsi, aml_name_decl("_UID", aml_int(0)));
+        crs = aml_resource_template();
+        aml_append(crs,
+                   aml_interrupt(aml_consumer, aml_level, aml_active_high,
+                   aml_exclusive, aml_not_wake_capable, irq + i));
+        aml_append(dev_gsi, aml_name_decl("_PRS", crs));
+        crs = aml_resource_template();
+        aml_append(crs,
+                   aml_interrupt(aml_consumer, aml_level, aml_active_high,
+                   aml_exclusive, aml_not_wake_capable, irq + i));
+        aml_append(dev_gsi, aml_name_decl("_CRS", crs));
+        method = aml_method("_SRS", 1);
+        aml_append(dev_gsi, method);
+        aml_append(dev, dev_gsi);
+    }
+
+    method = aml_method("_CBA", 0);
+    aml_append(method, aml_return(aml_int(info->pcie_ecam.addr)));
+    aml_append(dev, method);
+
+    method = aml_method("_CRS", 0);
+    Aml *rbuf = aml_resource_template();
+    aml_append(rbuf,
+        aml_word_bus_number(aml_min_fixed, aml_max_fixed, aml_pos_decode,
+                            0x0000, 0x0000, info->nr_pcie_buses - 1,
+                            0x0000, info->nr_pcie_buses));
+    aml_append(rbuf,
+        aml_dword_memory(aml_pos_decode, aml_min_fixed, aml_max_fixed,
+                         aml_non_cacheable, aml_ReadWrite,
+                         0x0000, info->pcie_mmio.addr,
+                         info->pcie_mmio.addr + info->pcie_mmio.size - 1,
+                         0x0000, info->pcie_mmio.size));
+    aml_append(rbuf,
+        aml_dword_io(aml_min_fixed, aml_max_fixed,
+                     aml_pos_decode, aml_entire_range,
+                     0x0000, 0x0000, info->pcie_ioport.size - 1,
+                     info->pcie_ioport.addr, info->pcie_ioport.size));
+
+    aml_append(method, aml_name_decl("RBUF", rbuf));
+    aml_append(method, aml_return(rbuf));
+    aml_append(dev, method);
+
+    /* Declare an _OSC (OS Control Handoff) method */
+    aml_append(dev, aml_name_decl("SUPP", aml_int(0)));
+    aml_append(dev, aml_name_decl("CTRL", aml_int(0)));
+    method = aml_method("_OSC", 4);
+    aml_append(method,
+        aml_create_dword_field(aml_arg(3), aml_int(0), "CDW1"));
+
+    /* PCI Firmware Specification 3.0
+     * 4.5.1. _OSC Interface for PCI Host Bridge Devices
+     * The _OSC interface for a PCI/PCI-X/PCI Express hierarchy is
+     * identified by the Universal Unique IDentifier (UUID)
+     * 33DB4D5B-1FF7-401C-9657-7441C03DD766
+     */
+    UUID = aml_touuid("33DB4D5B-1FF7-401C-9657-7441C03DD766");
+    ifctx = aml_if(aml_equal(aml_arg(0), UUID));
+    aml_append(ifctx,
+        aml_create_dword_field(aml_arg(3), aml_int(4), "CDW2"));
+    aml_append(ifctx,
+        aml_create_dword_field(aml_arg(3), aml_int(8), "CDW3"));
+    aml_append(ifctx, aml_store(aml_name("CDW2"), aml_name("SUPP")));
+    aml_append(ifctx, aml_store(aml_name("CDW3"), aml_name("CTRL")));
+    aml_append(ifctx, aml_store(aml_and(aml_name("CTRL"), aml_int(0x1D)),
+                                aml_name("CTRL")));
+
+    ifctx1 = aml_if(aml_lnot(aml_equal(aml_arg(1), aml_int(0x1))));
+    aml_append(ifctx1, aml_store(aml_or(aml_name("CDW1"), aml_int(0x08)),
+                                 aml_name("CDW1")));
+    aml_append(ifctx, ifctx1);
+
+    ifctx1 = aml_if(aml_lnot(aml_equal(aml_name("CDW3"), aml_name("CTRL"))));
+    aml_append(ifctx1, aml_store(aml_or(aml_name("CDW1"), aml_int(0x10)),
+                                 aml_name("CDW1")));
+    aml_append(ifctx, ifctx1);
+
+    aml_append(ifctx, aml_store(aml_name("CTRL"), aml_name("CDW3")));
+    aml_append(ifctx, aml_return(aml_arg(3)));
+    aml_append(method, ifctx);
+
+    elsectx = aml_else();
+    aml_append(elsectx, aml_store(aml_or(aml_name("CDW1"), aml_int(4)),
+                                  aml_name("CDW1")));
+    aml_append(elsectx, aml_return(aml_arg(3)));
+    aml_append(method, elsectx);
+    aml_append(dev, method);
+
+    method = aml_method("_DSM", 4);
+
+    /* PCI Firmware Specification 3.0
+     * 4.6.1. _DSM for PCI Express Slot Information
+     * The UUID in _DSM in this context is
+     * {E5C937D0-3553-4D7A-9117-EA4D19C3434D}
+     */
+    UUID = aml_touuid("E5C937D0-3553-4D7A-9117-EA4D19C3434D");
+    ifctx = aml_if(aml_equal(aml_arg(0), UUID));
+    ifctx1 = aml_if(aml_equal(aml_arg(2), aml_int(0)));
+    uint8_t byte_list[1] = {1};
+    buf = aml_buffer(1, byte_list);
+    aml_append(ifctx1, aml_return(buf));
+    aml_append(ifctx, ifctx1);
+    aml_append(method, ifctx);
+
+    byte_list[0] = 0;
+    buf = aml_buffer(1, byte_list);
+    aml_append(method, aml_return(buf));
+    aml_append(dev, method);
+
+    Aml *dev_rp0 = aml_device("%s", "RP0");
+    aml_append(dev_rp0, aml_name_decl("_ADR", aml_int(0)));
+    aml_append(dev, dev_rp0);
+    aml_append(scope, dev);
+}
+
 /* RSDP */
 static GArray *
 build_rsdp(GArray *rsdp_table, GArray *linker, unsigned rsdt)
@@ -306,6 +456,8 @@ build_dsdt(GArray *table_data, GArray *linker, 
VirtGuestInfo *guest_info)
     acpi_dsdt_add_flash(scope, info->flash_memmap);
     acpi_dsdt_add_virtio(scope, info->virtio_mmio_memmap,
              info->virtio_mmio_irq, info->virtio_mmio_num);
+    acpi_dsdt_add_pci(scope, guest_info->pcie_info);
+
     aml_append(dsdt, scope);
 
     /* copy AML table into ACPI tables blob and patch header there */
-- 
2.0.4