From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:54169) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eOdXz-00072l-G9 for qemu-devel@nongnu.org; Tue, 12 Dec 2017 00:56:09 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eOdXu-0006K3-QE for qemu-devel@nongnu.org; Tue, 12 Dec 2017 00:56:07 -0500 Message-ID: <5A2F6F44.8050602@huawei.com> Date: Tue, 12 Dec 2017 13:55:16 +0800 From: Shannon Zhao MIME-Version: 1.0 References: <1512745328-5109-1-git-send-email-peter.maydell@linaro.org> <1512745328-5109-3-git-send-email-peter.maydell@linaro.org> In-Reply-To: <1512745328-5109-3-git-send-email-peter.maydell@linaro.org> Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [PATCH 2/3] hw/arm/virt: Add another UART to the virt board List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Peter Maydell , qemu-arm@nongnu.org, qemu-devel@nongnu.org Cc: "Jason A . Donenfeld" , Shannon Zhao On 2017/12/8 23:02, Peter Maydell wrote: > Currently we only provide one non-secure UART on the virt > board. This is OK for most purposes, but there are some > use cases where having a second UART would be useful (like > bare-metal testing where you don't really want to have to > probe and set up a PCI device just to have a second comms > channel). > > Add a second NS UART to the virt board. This will be the > second serial device if 'secure=no' (the default), and the > third serial device if 'secure=yes'. > > Signed-off-by: Peter Maydell > --- > include/hw/arm/virt.h | 2 ++ > hw/arm/virt.c | 19 ++++++++++++++++--- > 2 files changed, 18 insertions(+), 3 deletions(-) > > diff --git a/include/hw/arm/virt.h b/include/hw/arm/virt.h > index 33b0ff3..685009a 100644 > --- a/include/hw/arm/virt.h > +++ b/include/hw/arm/virt.h > @@ -72,6 +72,7 @@ enum { > VIRT_GPIO, > VIRT_SECURE_UART, > VIRT_SECURE_MEM, > + VIRT_UART_2, > }; > > typedef struct MemMapEntry { > @@ -85,6 +86,7 @@ typedef struct { > bool no_its; > bool no_pmu; > bool claim_edge_triggered_timers; > + bool no_second_uart; > } VirtMachineClass; > > typedef struct { > diff --git a/hw/arm/virt.c b/hw/arm/virt.c > index 543f9bd..e234f55 100644 > --- a/hw/arm/virt.c > +++ b/hw/arm/virt.c > @@ -139,6 +139,7 @@ static const MemMapEntry a15memmap[] = { > [VIRT_FW_CFG] = { 0x09020000, 0x00000018 }, > [VIRT_GPIO] = { 0x09030000, 0x00001000 }, > [VIRT_SECURE_UART] = { 0x09040000, 0x00001000 }, > + [VIRT_UART_2] = { 0x09050000, 0x00001000 }, > [VIRT_MMIO] = { 0x0a000000, 0x00000200 }, > /* ...repeating for a total of NUM_VIRTIO_TRANSPORTS, each of that size */ > [VIRT_PLATFORM_BUS] = { 0x0c000000, 0x02000000 }, > @@ -157,6 +158,7 @@ static const int a15irqmap[] = { > [VIRT_PCIE] = 3, /* ... to 6 */ > [VIRT_GPIO] = 7, > [VIRT_SECURE_UART] = 8, > + [VIRT_UART_2] = 9, > [VIRT_MMIO] = 16, /* ...to 16 + NUM_VIRTIO_TRANSPORTS - 1 */ > [VIRT_GIC_V2M] = 48, /* ...to 48 + NUM_GICV2M_SPIS - 1 */ > [VIRT_PLATFORM_BUS] = 112, /* ...to 112 + PLATFORM_BUS_NUM_IRQS -1 */ > @@ -676,7 +678,7 @@ static void create_uart(const VirtMachineState *vms, qemu_irq *pic, int uart, > > if (uart == VIRT_UART) { > qemu_fdt_setprop_string(vms->fdt, "/chosen", "stdout-path", nodename); > - } else { > + } else if (uart == VIRT_SECURE_UART) { > /* Mark as not usable by the normal world */ > qemu_fdt_setprop_string(vms->fdt, nodename, "status", "disabled"); > qemu_fdt_setprop_string(vms->fdt, nodename, "secure-status", "okay"); > @@ -1260,6 +1262,7 @@ static void machvirt_init(MachineState *machine) > int n, virt_max_cpus; > MemoryRegion *ram = g_new(MemoryRegion, 1); > bool firmware_loaded = bios_name || drive_get(IF_PFLASH, 0, 0); > + int uart_count = 0; > > /* We can probe only here because during property set > * KVM is not available yet > @@ -1419,11 +1422,16 @@ static void machvirt_init(MachineState *machine) > > fdt_add_pmu_nodes(vms); > > - create_uart(vms, pic, VIRT_UART, sysmem, serial_hds[0]); > + create_uart(vms, pic, VIRT_UART, sysmem, serial_hds[uart_count++]); > > if (vms->secure) { > create_secure_ram(vms, secure_sysmem); > - create_uart(vms, pic, VIRT_SECURE_UART, secure_sysmem, serial_hds[1]); > + create_uart(vms, pic, VIRT_SECURE_UART, secure_sysmem, > + serial_hds[uart_count++]); > + } > + > + if (!vmc->no_second_uart) { > + create_uart(vms, pic, VIRT_UART_2, sysmem, serial_hds[uart_count++]); > } > > create_rtc(vms, pic); > @@ -1693,8 +1701,13 @@ static void virt_2_11_instance_init(Object *obj) > > static void virt_machine_2_11_options(MachineClass *mc) > { > + VirtMachineClass *vmc = VIRT_MACHINE_CLASS(OBJECT_CLASS(mc)); > + > virt_machine_2_12_options(mc); > SET_MACHINE_COMPAT(mc, VIRT_COMPAT_2_11); > + > + /* The second NS UART was added in 2.12 */ > + vmc->no_second_uart = true; > } > DEFINE_VIRT_MACHINE(2, 11) > > I'm wondering if it need to provide a machine option for user to choose whether adding the second uart or not. Thanks, -- Shannon