Re: [Xen-devel] [PATCH 09/10 v2] xen/arm: vpl011: Add a pl011 uart DT node in the guest device tree

[Julien Grall <julien.grall@xxxxxxx>]

Hi Bhupinder,

On 28/04/17 17:01, Bhupinder Thakur wrote:
> The SBSA uart node format is as specified in
> Documentation/devicetree/bindings/serial/arm_sbsa_uart.txt and given below:
>
> ARM SBSA defined generic UART
> ------------------------------
> This UART uses a subset of the PL011 registers and consequently lives
> in the PL011 driver. It's baudrate and other communication parameters
> cannot be adjusted at runtime, so it lacks a clock specifier here.
>
> Required properties:
> - compatible: must be "arm,sbsa-uart"
> - reg: exactly one register range
> - interrupts: exactly one interrupt specifier
> - current-speed: the (fixed) baud rate set by the firmware
What is the plan for ACPI support?

> Signed-off-by: Bhupinder Thakur <bhupinder.thakur@xxxxxxxxxx>
> Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
> ---
>
> Changes since v1:
> - Modified the code to increment nr_spis based on the SPI value reserved for
>   vpl011.
> - Added a check to verify that physical irq assigment is not conflicting with
>   vpl011 SPI.
Those 2 changes are usually a call to drop reviewed-by or at least to 
check whether the reviewer (here Stefano) is happy with the changes made.
> - Fixed minor indentation issues.
>
>  tools/libxl/libxl_arm.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++--
>  1 file changed, 52 insertions(+), 2 deletions(-)
>
> diff --git a/tools/libxl/libxl_arm.c b/tools/libxl/libxl_arm.c
> index d842d88..45a56a8 100644
> --- a/tools/libxl/libxl_arm.c
> +++ b/tools/libxl/libxl_arm.c
> @@ -43,11 +43,25 @@ int libxl__arch_domain_prepare_config(libxl__gc *gc,
>  {
>      uint32_t nr_spis = 0;
>      unsigned int i;
> +    bool vpl011_enabled = !strcmp(d_config->b_info.vuart, "pl011");
> +
> +    /*
> +     * If pl011 vuart is enabled then increment the nr_spis to allow allocation
> +     * of SPI VIRQ for pl011.
> +     */
> +    if (vpl011_enabled)
> +        nr_spis += (GUEST_VPL011_SPI - 32)+1;
space before and after +.

>      for (i = 0; i < d_config->b_info.num_irqs; i++) {
>          uint32_t irq = d_config->b_info.irqs[i];
>          uint32_t spi;
>
> +        if (vpl011_enabled && irq == GUEST_VPL011_SPI)
> +        {
> +            LOG(ERROR, "Physical IRQ %d conflicting with pl011 SPI\n", irq);
s/%d/%u/

> +            return ERROR_FAIL;
> +        }
> +
>          if (irq < 32)
>              continue;
>
> @@ -130,9 +144,10 @@ static struct arch_info {
>      const char *guest_type;
>      const char *timer_compat;
>      const char *cpu_compat;
> +    const char *uart_compat;
>  } arch_info[] = {
> -    {"xen-3.0-armv7l",  "arm,armv7-timer", "arm,cortex-a15" },
> -    {"xen-3.0-aarch64", "arm,armv8-timer", "arm,armv8" },
> +    {"xen-3.0-armv7l",  "arm,armv7-timer", "arm,cortex-a15", "arm,sbsa-uart" },
> +    {"xen-3.0-aarch64", "arm,armv8-timer", "arm,armv8", "arm,sbsa-uart" },
>  };
>
>  /*
> @@ -590,6 +605,38 @@ static int make_hypervisor_node(libxl__gc *gc, void *fdt,
>      return 0;
>  }
>
> +static int make_vpl011_uart_node(libxl__gc *gc, void *fdt,
> +                                 const struct arch_info *ainfo,
> +                                 struct xc_dom_image *dom)
> +{
> +    int res;
> +    gic_interrupt intr;
> +
> +    res = fdt_begin_node(fdt, "sbsa-pl011");
> +    if (res) return res;
> +
> +    res = fdt_property_compat(gc, fdt, 1, ainfo->uart_compat);
> +    if (res) return res;
> +
> +    res = fdt_property_regs(gc, fdt, ROOT_ADDRESS_CELLS, ROOT_SIZE_CELLS,
> +                            1,
> +                            GUEST_PL011_BASE, GUEST_PL011_SIZE);
> +    if (res) return res;
> +
> +    set_interrupt(intr, GUEST_VPL011_SPI, 0xf, DT_IRQ_TYPE_LEVEL_HIGH);
> +
> +    res = fdt_property_interrupts(gc, fdt, &intr, 1);
> +    if (res) return res;
> +
> +    /* Use a default baud rate of 115200. */
> +    fdt_property_u32(fdt, "current-speed", 115200);
Please explain in the commit message why 115200.

> +
> +    res = fdt_end_node(fdt);
> +    if (res) return res;
> +
> +    return 0;
> +}
> +
>  static const struct arch_info *get_arch_info(libxl__gc *gc,
>                                               const struct xc_dom_image *dom)
>  {
> @@ -889,6 +936,9 @@ next_resize:
>          FDT( make_timer_node(gc, fdt, ainfo, xc_config->clock_frequency) );
>          FDT( make_hypervisor_node(gc, fdt, vers) );
>
> +        if (!strcmp(info->vuart, "pl011"))
> +            FDT( make_vpl011_uart_node(gc, fdt, ainfo, dom) );
> +
>          if (pfdt)
>              FDT( copy_partial_fdt(gc, fdt, pfdt) );
Cheers,

--
Julien Grall

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