Re: [Qemu-devel] [RFC PATCH 2/4] hw/arm/virt: Add GPIO based pcdimm hotplug ACPI event support

[Igor Mammedov <imammedo@redhat.com>]

On Mon, 28 Jan 2019 11:05:44 +0000
Shameer Kolothum <shameerali.kolothum.thodi@huawei.com> wrote:

> This adds support for using PL061 GPIO controller pin to trigger
> pcdimm hotplug event to guest.
I'll wait for GED reincarnation of this patch.

> 
> Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
> ---
>  default-configs/arm-softmmu.mak |  1 +
>  hw/arm/virt-acpi-build.c        | 28 ++++++++++++++++++++++++----
>  hw/arm/virt.c                   | 37 +++++++++++++++++++++++++++++++++----
>  include/hw/arm/virt.h           | 14 ++++++++++++++
>  4 files changed, 72 insertions(+), 8 deletions(-)
> 
> diff --git a/default-configs/arm-softmmu.mak b/default-configs/arm-softmmu.mak
> index 5deabc1..ebbc67b 100644
> --- a/default-configs/arm-softmmu.mak
> +++ b/default-configs/arm-softmmu.mak
> @@ -163,3 +163,4 @@ CONFIG_MEM_DEVICE=y
>  CONFIG_DIMM=y
>  CONFIG_NVDIMM=y
>  CONFIG_ACPI_NVDIMM=y
> +CONFIG_ACPI_MEMORY_HOTPLUG=y
> diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
> index ab30e28..eedd323 100644
> --- a/hw/arm/virt-acpi-build.c
> +++ b/hw/arm/virt-acpi-build.c
> @@ -40,6 +40,7 @@
>  #include "hw/loader.h"
>  #include "hw/hw.h"
>  #include "hw/acpi/aml-build.h"
> +#include "hw/acpi/memory_hotplug.h"
>  #include "hw/pci/pcie_host.h"
>  #include "hw/pci/pci.h"
>  #include "hw/arm/virt.h"
> @@ -327,8 +328,10 @@ static void acpi_dsdt_add_pci(Aml *scope, const MemMapEntry *memmap,
>  }
>  
>  static void acpi_dsdt_add_gpio(Aml *scope, const MemMapEntry *gpio_memmap,
> -                                           uint32_t gpio_irq)
> +                               uint32_t gpio_irq, VirtMachineState *vms)
>  {
> +    uint32_t pin_list[1];
> +
>      Aml *dev = aml_device("GPO0");
>      aml_append(dev, aml_name_decl("_HID", aml_string("ARMH0061")));
>      aml_append(dev, aml_name_decl("_ADR", aml_int(0)));
> @@ -342,11 +345,21 @@ static void acpi_dsdt_add_gpio(Aml *scope, const MemMapEntry *gpio_memmap,
>      aml_append(dev, aml_name_decl("_CRS", crs));
>  
>      Aml *aei = aml_resource_template();
> -    /* Pin 3 for power button */
> -    const uint32_t pin_list[1] = {3};
> +
> +    /* GPIO Interrupt connection descriptor for power button */
> +    pin_list[0] = GPIO_PWRB;
>      aml_append(aei, aml_gpio_int(AML_CONSUMER, AML_EDGE, AML_ACTIVE_HIGH,
>                                   AML_EXCLUSIVE, AML_PULL_UP, 0, pin_list, 1,
>                                   "GPO0", NULL, 0));
> +
> +    if (vms->acpi_memhp_state.is_enabled) {
> +        /* GPIO Interrupt connection descriptor for pc-dimm hotplug */
> +        pin_list[0] = GPIO_PCDIMM;
> +        aml_append(aei, aml_gpio_int(AML_CONSUMER, AML_EDGE, AML_ACTIVE_HIGH,
> +                                     AML_EXCLUSIVE, AML_PULL_UP, 0, pin_list,
> +                                     1, "GPO0", NULL, 0));
> +    }
> +
>      aml_append(dev, aml_name_decl("_AEI", aei));
>  
>      /* _E03 is handle for power button */
> @@ -735,6 +748,8 @@ build_dsdt(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
>      Aml *scope, *dsdt;
>      const MemMapEntry *memmap = vms->memmap;
>      const int *irqmap = vms->irqmap;
> +    MachineState *ms = MACHINE(vms);
> +    uint32_t nr_mem = ms->ram_slots;
>  
>      dsdt = init_aml_allocator();
>      /* Reserve space for header */
> @@ -756,11 +771,16 @@ build_dsdt(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
>      acpi_dsdt_add_pci(scope, memmap, (irqmap[VIRT_PCIE] + ARM_SPI_BASE),
>                        vms->highmem, vms->highmem_ecam);
>      acpi_dsdt_add_gpio(scope, &memmap[VIRT_GPIO],
> -                       (irqmap[VIRT_GPIO] + ARM_SPI_BASE));
> +                       (irqmap[VIRT_GPIO] + ARM_SPI_BASE), vms);
>      acpi_dsdt_add_power_button(scope);
>  
>      aml_append(dsdt, scope);
>  
> +    if (vms->acpi_memhp_state.is_enabled) {
> +        build_memory_hotplug_aml(dsdt, nr_mem, "\\_SB.GPO0",
> +                                 "\\_SB.GPO0._E02", AML_SYSTEM_MEMORY);
> +    }
> +
>      /* copy AML table into ACPI tables blob and patch header there */
>      g_array_append_vals(table_data, dsdt->buf->data, dsdt->buf->len);
>      build_header(linker, table_data,
> diff --git a/hw/arm/virt.c b/hw/arm/virt.c
> index 8c6dd59..884960d 100644
> --- a/hw/arm/virt.c
> +++ b/hw/arm/virt.c
> @@ -173,6 +173,9 @@ static const char *valid_cpus[] = {
>      ARM_CPU_TYPE_NAME("max"),
>  };
>  
> +static QLIST_HEAD(, GPIODevice) gpio_devices =
> +    QLIST_HEAD_INITIALIZER(gpio_devices);
> +
>  static bool cpu_type_valid(const char *cpu)
>  {
>      int i;
> @@ -740,11 +743,34 @@ static void create_rtc(const VirtMachineState *vms, qemu_irq *pic)
>      g_free(nodename);
>  }
>  
> -static DeviceState *gpio_key_dev;
> +static DeviceState *virt_get_gpio_dev(int pin)
> +{
> +    GPIODevice *gpio_dev;
> +
> +    QLIST_FOREACH(gpio_dev, &gpio_devices, next) {
> +        if (pin == gpio_dev->pin_num) {
> +            return gpio_dev->dev;
> +        }
> +    }
> +    return NULL;
> +}
> +
> +static void virt_create_gpio_dev(DeviceState *pl061_dev, int pin)
> +{
> +    GPIODevice *gpio_dev;
> +
> +    gpio_dev = g_malloc0(sizeof(*gpio_dev));
> +    gpio_dev->dev = sysbus_create_simple("gpio-key", -1,
> +                                          qdev_get_gpio_in(pl061_dev, pin));
> +    gpio_dev->pin_num = pin;
> +    QLIST_INSERT_HEAD(&gpio_devices, gpio_dev, next);
> +}
> +
>  static void virt_powerdown_req(Notifier *n, void *opaque)
>  {
> +    DeviceState *dev = virt_get_gpio_dev(GPIO_PWRB);
>      /* use gpio Pin 3 for power button event */
> -    qemu_set_irq(qdev_get_gpio_in(gpio_key_dev, 0), 1);
> +    qemu_set_irq(qdev_get_gpio_in(dev, 0), 1);
>  }
>  
>  static Notifier virt_system_powerdown_notifier = {
> @@ -777,8 +803,11 @@ static void create_gpio(const VirtMachineState *vms, qemu_irq *pic)
>      qemu_fdt_setprop_string(vms->fdt, nodename, "clock-names", "apb_pclk");
>      qemu_fdt_setprop_cell(vms->fdt, nodename, "phandle", phandle);
>  
> -    gpio_key_dev = sysbus_create_simple("gpio-key", -1,
> -                                        qdev_get_gpio_in(pl061_dev, 3));
> +    virt_create_gpio_dev(pl061_dev, GPIO_PWRB);
> +
> +    if (vms->acpi_memhp_state.is_enabled) {
> +        virt_create_gpio_dev(pl061_dev, GPIO_PCDIMM);
> +    }
>      qemu_fdt_add_subnode(vms->fdt, "/gpio-keys");
>      qemu_fdt_setprop_string(vms->fdt, "/gpio-keys", "compatible", "gpio-keys");
>      qemu_fdt_setprop_cell(vms->fdt, "/gpio-keys", "#size-cells", 0);
> diff --git a/include/hw/arm/virt.h b/include/hw/arm/virt.h
> index 6bb7f92..ef39ce6 100644
> --- a/include/hw/arm/virt.h
> +++ b/include/hw/arm/virt.h
> @@ -38,6 +38,7 @@
>  #include "sysemu/kvm.h"
>  #include "hw/intc/arm_gicv3_common.h"
>  #include "hw/mem/nvdimm.h"
> +#include "hw/acpi/memory_hotplug.h"
>  
>  #define NUM_GICV2M_SPIS       64
>  #define NUM_VIRTIO_TRANSPORTS 32
> @@ -136,8 +137,21 @@ typedef struct {
>      hwaddr high_io_base;
>      bool extended_memmap;
>      AcpiNVDIMMState acpi_nvdimm_state;
> +    MemHotplugState acpi_memhp_state;
>  } VirtMachineState;
>  
> +/* GPIO pins for ACPI events */
> +enum {
> +    GPIO_PCDIMM = 2,
> +    GPIO_PWRB,
> +};
> +
> +typedef struct GPIODevice {
> +    DeviceState *dev;
> +    int pin_num;
> +    QLIST_ENTRY(GPIODevice) next;
> +} GPIODevice;
> +
>  #define VIRT_ECAM_ID(high) (high ? VIRT_HIGH_PCIE_ECAM : VIRT_PCIE_ECAM)
>  
>  #define TYPE_VIRT_MACHINE   MACHINE_TYPE_NAME("virt")