Re: [Qemu-devel] [PATCH] riscv: virt: Add cpu-topology DT node.
On 6/25/19 12:41 PM, Daniel P. Berrangé wrote: > On Tue, Jun 25, 2019 at 12:36:35PM +0200, Philippe Mathieu-Daudé wrote: >> On 6/25/19 1:24 AM, Alistair Francis wrote: >>> On Mon, Jun 24, 2019 at 3:57 PM Atish Patra wrote: Currently, there is no cpu topology defined in RISC-V. Define a device tree node that clearly describes the entire topology. This saves the trouble of scanning individual cache to figure out the topology. Here is the linux kernel patch series that enables topology for RISC-V. http://lists.infradead.org/pipermail/linux-riscv/2019-June/005072.html CPU topology after applying this patch in QEMU & above series in kernel / # cat /sys/devices/system/cpu/cpu2/topology/thread_siblings_list 2 / # cat /sys/devices/system/cpu/cpu2/topology/physical_package_id 0 / # cat /sys/devices/system/cpu/cpu2/topology/core_siblings_list 0-7 Signed-off-by: Atish Patra --- hw/riscv/virt.c | 21 +++-- 1 file changed, 19 insertions(+), 2 deletions(-) diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c index 84d94d0c42d8..da0b8aa18747 100644 --- a/hw/riscv/virt.c +++ b/hw/riscv/virt.c @@ -203,9 +203,12 @@ static void *create_fdt(RISCVVirtState *s, const struct MemmapEntry *memmap, qemu_fdt_setprop_string(fdt, nodename, "status", "okay"); qemu_fdt_setprop_cell(fdt, nodename, "reg", cpu); qemu_fdt_setprop_string(fdt, nodename, "device_type", "cpu"); +qemu_fdt_setprop_cell(fdt, nodename, "phandle", cpu_phandle); +qemu_fdt_setprop_cell(fdt, nodename, "linux,phandle", cpu_phandle); +int intc_phandle = phandle++; >>> >>> Don't declare variables in the middle of code. The variable must be >>> declared at the start of a block. >> >> I guess this has been relaxed since we allow GNU C99: > > Even though we allow GNU C99 I think it is undesirable to declare variables > in the middle of methods. This is especially true when combined with "goto" > as you end up with undefined / uninitialized vairable contents at the jump > target, if we've jumped over the variable declaration. > > We can't enforce location of variable declarations, but I'd really > recommend we keep them all at the start of code blocks. In this case I find it desirable: for (int i = 0; ...) { ... } For the rest, I agree to keep them at the start of code block. Regards, Phil.
Re: [Qemu-devel] [PATCH] riscv: virt: Add cpu-topology DT node.
On Tue, Jun 25, 2019 at 12:36:35PM +0200, Philippe Mathieu-Daudé wrote: > On 6/25/19 1:24 AM, Alistair Francis wrote: > > On Mon, Jun 24, 2019 at 3:57 PM Atish Patra wrote: > >> > >> Currently, there is no cpu topology defined in RISC-V. > >> Define a device tree node that clearly describes the > >> entire topology. This saves the trouble of scanning individual > >> cache to figure out the topology. > >> > >> Here is the linux kernel patch series that enables topology > >> for RISC-V. > >> > >> http://lists.infradead.org/pipermail/linux-riscv/2019-June/005072.html > >> > >> CPU topology after applying this patch in QEMU & above series in kernel > >> > >> / # cat /sys/devices/system/cpu/cpu2/topology/thread_siblings_list > >> 2 > >> / # cat /sys/devices/system/cpu/cpu2/topology/physical_package_id > >> 0 > >> / # cat /sys/devices/system/cpu/cpu2/topology/core_siblings_list > >> 0-7 > >> > >> Signed-off-by: Atish Patra > >> --- > >> hw/riscv/virt.c | 21 +++-- > >> 1 file changed, 19 insertions(+), 2 deletions(-) > >> > >> diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c > >> index 84d94d0c42d8..da0b8aa18747 100644 > >> --- a/hw/riscv/virt.c > >> +++ b/hw/riscv/virt.c > >> @@ -203,9 +203,12 @@ static void *create_fdt(RISCVVirtState *s, const > >> struct MemmapEntry *memmap, > >> qemu_fdt_setprop_string(fdt, nodename, "status", "okay"); > >> qemu_fdt_setprop_cell(fdt, nodename, "reg", cpu); > >> qemu_fdt_setprop_string(fdt, nodename, "device_type", "cpu"); > >> +qemu_fdt_setprop_cell(fdt, nodename, "phandle", cpu_phandle); > >> +qemu_fdt_setprop_cell(fdt, nodename, "linux,phandle", > >> cpu_phandle); > >> +int intc_phandle = phandle++; > > > > Don't declare variables in the middle of code. The variable must be > > declared at the start of a block. > > I guess this has been relaxed since we allow GNU C99: Even though we allow GNU C99 I think it is undesirable to declare variables in the middle of methods. This is especially true when combined with "goto" as you end up with undefined / uninitialized vairable contents at the jump target, if we've jumped over the variable declaration. We can't enforce location of variable declarations, but I'd really recommend we keep them all at the start of code blocks. Regards, Daniel -- |: https://berrange.com -o-https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o-https://fstop138.berrange.com :| |: https://entangle-photo.org-o-https://www.instagram.com/dberrange :|
Re: [Qemu-devel] [PATCH] riscv: virt: Add cpu-topology DT node.
On 6/25/19 1:24 AM, Alistair Francis wrote: > On Mon, Jun 24, 2019 at 3:57 PM Atish Patra wrote: >> >> Currently, there is no cpu topology defined in RISC-V. >> Define a device tree node that clearly describes the >> entire topology. This saves the trouble of scanning individual >> cache to figure out the topology. >> >> Here is the linux kernel patch series that enables topology >> for RISC-V. >> >> http://lists.infradead.org/pipermail/linux-riscv/2019-June/005072.html >> >> CPU topology after applying this patch in QEMU & above series in kernel >> >> / # cat /sys/devices/system/cpu/cpu2/topology/thread_siblings_list >> 2 >> / # cat /sys/devices/system/cpu/cpu2/topology/physical_package_id >> 0 >> / # cat /sys/devices/system/cpu/cpu2/topology/core_siblings_list >> 0-7 >> >> Signed-off-by: Atish Patra >> --- >> hw/riscv/virt.c | 21 +++-- >> 1 file changed, 19 insertions(+), 2 deletions(-) >> >> diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c >> index 84d94d0c42d8..da0b8aa18747 100644 >> --- a/hw/riscv/virt.c >> +++ b/hw/riscv/virt.c >> @@ -203,9 +203,12 @@ static void *create_fdt(RISCVVirtState *s, const struct >> MemmapEntry *memmap, >> qemu_fdt_setprop_string(fdt, nodename, "status", "okay"); >> qemu_fdt_setprop_cell(fdt, nodename, "reg", cpu); >> qemu_fdt_setprop_string(fdt, nodename, "device_type", "cpu"); >> +qemu_fdt_setprop_cell(fdt, nodename, "phandle", cpu_phandle); >> +qemu_fdt_setprop_cell(fdt, nodename, "linux,phandle", cpu_phandle); >> +int intc_phandle = phandle++; > > Don't declare variables in the middle of code. The variable must be > declared at the start of a block. I guess this has been relaxed since we allow GNU C99: https://git.qemu.org/?p=qemu.git;a=commit;h=7be41675f7cb16be7c8d2554add7a63fa43781a8 > > With that fixed: > > Reviewed-by: Alistair Francis > > Alistair > >> qemu_fdt_add_subnode(fdt, intc); >> -qemu_fdt_setprop_cell(fdt, intc, "phandle", cpu_phandle); >> -qemu_fdt_setprop_cell(fdt, intc, "linux,phandle", cpu_phandle); >> +qemu_fdt_setprop_cell(fdt, intc, "phandle", intc_phandle); >> +qemu_fdt_setprop_cell(fdt, intc, "linux,phandle", intc_phandle); >> qemu_fdt_setprop_string(fdt, intc, "compatible", "riscv,cpu-intc"); >> qemu_fdt_setprop(fdt, intc, "interrupt-controller", NULL, 0); >> qemu_fdt_setprop_cell(fdt, intc, "#interrupt-cells", 1); >> @@ -214,6 +217,20 @@ static void *create_fdt(RISCVVirtState *s, const struct >> MemmapEntry *memmap, >> g_free(nodename); >> } >> >> +/* Add cpu-topology node */ >> +qemu_fdt_add_subnode(fdt, "/cpus/cpu-map"); >> +qemu_fdt_add_subnode(fdt, "/cpus/cpu-map/cluster0"); >> +for (cpu = s->soc.num_harts - 1; cpu >= 0; cpu--) { >> +char *core_nodename = >> g_strdup_printf("/cpus/cpu-map/cluster0/core%d", >> + cpu); >> +char *cpu_nodename = g_strdup_printf("/cpus/cpu@%d", cpu); >> +uint32_t intc_phandle = qemu_fdt_get_phandle(fdt, cpu_nodename); >> +qemu_fdt_add_subnode(fdt, core_nodename); >> +qemu_fdt_setprop_cell(fdt, core_nodename, "cpu", intc_phandle); >> +g_free(core_nodename); >> +g_free(cpu_nodename); >> +} >> + >> cells = g_new0(uint32_t, s->soc.num_harts * 4); >> for (cpu = 0; cpu < s->soc.num_harts; cpu++) { >> nodename = >> -- >> 2.21.0 >> >> >
Re: [Qemu-devel] [PATCH] riscv: virt: Add cpu-topology DT node.
On Mon, 2019-06-24 at 16:24 -0700, Alistair Francis wrote: > On Mon, Jun 24, 2019 at 3:57 PM Atish Patra > wrote: > > Currently, there is no cpu topology defined in RISC-V. > > Define a device tree node that clearly describes the > > entire topology. This saves the trouble of scanning individual > > cache to figure out the topology. > > > > Here is the linux kernel patch series that enables topology > > for RISC-V. > > > > http://lists.infradead.org/pipermail/linux-riscv/2019-June/005072.html > > > > CPU topology after applying this patch in QEMU & above series in > > kernel > > > > / # cat /sys/devices/system/cpu/cpu2/topology/thread_siblings_list > > 2 > > / # cat /sys/devices/system/cpu/cpu2/topology/physical_package_id > > 0 > > / # cat /sys/devices/system/cpu/cpu2/topology/core_siblings_list > > 0-7 > > > > Signed-off-by: Atish Patra > > --- > > hw/riscv/virt.c | 21 +++-- > > 1 file changed, 19 insertions(+), 2 deletions(-) > > > > diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c > > index 84d94d0c42d8..da0b8aa18747 100644 > > --- a/hw/riscv/virt.c > > +++ b/hw/riscv/virt.c > > @@ -203,9 +203,12 @@ static void *create_fdt(RISCVVirtState *s, > > const struct MemmapEntry *memmap, > > qemu_fdt_setprop_string(fdt, nodename, "status", "okay"); > > qemu_fdt_setprop_cell(fdt, nodename, "reg", cpu); > > qemu_fdt_setprop_string(fdt, nodename, "device_type", > > "cpu"); > > +qemu_fdt_setprop_cell(fdt, nodename, "phandle", > > cpu_phandle); > > +qemu_fdt_setprop_cell(fdt, nodename, "linux,phandle", > > cpu_phandle); > > +int intc_phandle = phandle++; > > Don't declare variables in the middle of code. The variable must be > declared at the start of a block. > My bad. Fixed in v2. > With that fixed: > > Reviewed-by: Alistair Francis > > Alistair > > > qemu_fdt_add_subnode(fdt, intc); > > -qemu_fdt_setprop_cell(fdt, intc, "phandle", cpu_phandle); > > -qemu_fdt_setprop_cell(fdt, intc, "linux,phandle", > > cpu_phandle); > > +qemu_fdt_setprop_cell(fdt, intc, "phandle", intc_phandle); > > +qemu_fdt_setprop_cell(fdt, intc, "linux,phandle", > > intc_phandle); > > qemu_fdt_setprop_string(fdt, intc, "compatible", > > "riscv,cpu-intc"); > > qemu_fdt_setprop(fdt, intc, "interrupt-controller", NULL, > > 0); > > qemu_fdt_setprop_cell(fdt, intc, "#interrupt-cells", 1); > > @@ -214,6 +217,20 @@ static void *create_fdt(RISCVVirtState *s, > > const struct MemmapEntry *memmap, > > g_free(nodename); > > } > > > > +/* Add cpu-topology node */ > > +qemu_fdt_add_subnode(fdt, "/cpus/cpu-map"); > > +qemu_fdt_add_subnode(fdt, "/cpus/cpu-map/cluster0"); > > +for (cpu = s->soc.num_harts - 1; cpu >= 0; cpu--) { > > +char *core_nodename = g_strdup_printf("/cpus/cpu- > > map/cluster0/core%d", > > + cpu); > > +char *cpu_nodename = g_strdup_printf("/cpus/cpu@%d", cpu); > > +uint32_t intc_phandle = qemu_fdt_get_phandle(fdt, > > cpu_nodename); > > +qemu_fdt_add_subnode(fdt, core_nodename); > > +qemu_fdt_setprop_cell(fdt, core_nodename, "cpu", > > intc_phandle); > > +g_free(core_nodename); > > +g_free(cpu_nodename); > > +} > > + > > cells = g_new0(uint32_t, s->soc.num_harts * 4); > > for (cpu = 0; cpu < s->soc.num_harts; cpu++) { > > nodename = > > -- > > 2.21.0 > > > > -- Regards, Atish
Re: [Qemu-devel] [PATCH] riscv: virt: Add cpu-topology DT node.
On Mon, Jun 24, 2019 at 3:57 PM Atish Patra wrote: > > Currently, there is no cpu topology defined in RISC-V. > Define a device tree node that clearly describes the > entire topology. This saves the trouble of scanning individual > cache to figure out the topology. > > Here is the linux kernel patch series that enables topology > for RISC-V. > > http://lists.infradead.org/pipermail/linux-riscv/2019-June/005072.html > > CPU topology after applying this patch in QEMU & above series in kernel > > / # cat /sys/devices/system/cpu/cpu2/topology/thread_siblings_list > 2 > / # cat /sys/devices/system/cpu/cpu2/topology/physical_package_id > 0 > / # cat /sys/devices/system/cpu/cpu2/topology/core_siblings_list > 0-7 > > Signed-off-by: Atish Patra > --- > hw/riscv/virt.c | 21 +++-- > 1 file changed, 19 insertions(+), 2 deletions(-) > > diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c > index 84d94d0c42d8..da0b8aa18747 100644 > --- a/hw/riscv/virt.c > +++ b/hw/riscv/virt.c > @@ -203,9 +203,12 @@ static void *create_fdt(RISCVVirtState *s, const struct > MemmapEntry *memmap, > qemu_fdt_setprop_string(fdt, nodename, "status", "okay"); > qemu_fdt_setprop_cell(fdt, nodename, "reg", cpu); > qemu_fdt_setprop_string(fdt, nodename, "device_type", "cpu"); > +qemu_fdt_setprop_cell(fdt, nodename, "phandle", cpu_phandle); > +qemu_fdt_setprop_cell(fdt, nodename, "linux,phandle", cpu_phandle); > +int intc_phandle = phandle++; Don't declare variables in the middle of code. The variable must be declared at the start of a block. With that fixed: Reviewed-by: Alistair Francis Alistair > qemu_fdt_add_subnode(fdt, intc); > -qemu_fdt_setprop_cell(fdt, intc, "phandle", cpu_phandle); > -qemu_fdt_setprop_cell(fdt, intc, "linux,phandle", cpu_phandle); > +qemu_fdt_setprop_cell(fdt, intc, "phandle", intc_phandle); > +qemu_fdt_setprop_cell(fdt, intc, "linux,phandle", intc_phandle); > qemu_fdt_setprop_string(fdt, intc, "compatible", "riscv,cpu-intc"); > qemu_fdt_setprop(fdt, intc, "interrupt-controller", NULL, 0); > qemu_fdt_setprop_cell(fdt, intc, "#interrupt-cells", 1); > @@ -214,6 +217,20 @@ static void *create_fdt(RISCVVirtState *s, const struct > MemmapEntry *memmap, > g_free(nodename); > } > > +/* Add cpu-topology node */ > +qemu_fdt_add_subnode(fdt, "/cpus/cpu-map"); > +qemu_fdt_add_subnode(fdt, "/cpus/cpu-map/cluster0"); > +for (cpu = s->soc.num_harts - 1; cpu >= 0; cpu--) { > +char *core_nodename = > g_strdup_printf("/cpus/cpu-map/cluster0/core%d", > + cpu); > +char *cpu_nodename = g_strdup_printf("/cpus/cpu@%d", cpu); > +uint32_t intc_phandle = qemu_fdt_get_phandle(fdt, cpu_nodename); > +qemu_fdt_add_subnode(fdt, core_nodename); > +qemu_fdt_setprop_cell(fdt, core_nodename, "cpu", intc_phandle); > +g_free(core_nodename); > +g_free(cpu_nodename); > +} > + > cells = g_new0(uint32_t, s->soc.num_harts * 4); > for (cpu = 0; cpu < s->soc.num_harts; cpu++) { > nodename = > -- > 2.21.0 > >
[Qemu-devel] [PATCH] riscv: virt: Add cpu-topology DT node.
Currently, there is no cpu topology defined in RISC-V. Define a device tree node that clearly describes the entire topology. This saves the trouble of scanning individual cache to figure out the topology. Here is the linux kernel patch series that enables topology for RISC-V. http://lists.infradead.org/pipermail/linux-riscv/2019-June/005072.html CPU topology after applying this patch in QEMU & above series in kernel / # cat /sys/devices/system/cpu/cpu2/topology/thread_siblings_list 2 / # cat /sys/devices/system/cpu/cpu2/topology/physical_package_id 0 / # cat /sys/devices/system/cpu/cpu2/topology/core_siblings_list 0-7 Signed-off-by: Atish Patra --- hw/riscv/virt.c | 21 +++-- 1 file changed, 19 insertions(+), 2 deletions(-) diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c index 84d94d0c42d8..da0b8aa18747 100644 --- a/hw/riscv/virt.c +++ b/hw/riscv/virt.c @@ -203,9 +203,12 @@ static void *create_fdt(RISCVVirtState *s, const struct MemmapEntry *memmap, qemu_fdt_setprop_string(fdt, nodename, "status", "okay"); qemu_fdt_setprop_cell(fdt, nodename, "reg", cpu); qemu_fdt_setprop_string(fdt, nodename, "device_type", "cpu"); +qemu_fdt_setprop_cell(fdt, nodename, "phandle", cpu_phandle); +qemu_fdt_setprop_cell(fdt, nodename, "linux,phandle", cpu_phandle); +int intc_phandle = phandle++; qemu_fdt_add_subnode(fdt, intc); -qemu_fdt_setprop_cell(fdt, intc, "phandle", cpu_phandle); -qemu_fdt_setprop_cell(fdt, intc, "linux,phandle", cpu_phandle); +qemu_fdt_setprop_cell(fdt, intc, "phandle", intc_phandle); +qemu_fdt_setprop_cell(fdt, intc, "linux,phandle", intc_phandle); qemu_fdt_setprop_string(fdt, intc, "compatible", "riscv,cpu-intc"); qemu_fdt_setprop(fdt, intc, "interrupt-controller", NULL, 0); qemu_fdt_setprop_cell(fdt, intc, "#interrupt-cells", 1); @@ -214,6 +217,20 @@ static void *create_fdt(RISCVVirtState *s, const struct MemmapEntry *memmap, g_free(nodename); } +/* Add cpu-topology node */ +qemu_fdt_add_subnode(fdt, "/cpus/cpu-map"); +qemu_fdt_add_subnode(fdt, "/cpus/cpu-map/cluster0"); +for (cpu = s->soc.num_harts - 1; cpu >= 0; cpu--) { +char *core_nodename = g_strdup_printf("/cpus/cpu-map/cluster0/core%d", + cpu); +char *cpu_nodename = g_strdup_printf("/cpus/cpu@%d", cpu); +uint32_t intc_phandle = qemu_fdt_get_phandle(fdt, cpu_nodename); +qemu_fdt_add_subnode(fdt, core_nodename); +qemu_fdt_setprop_cell(fdt, core_nodename, "cpu", intc_phandle); +g_free(core_nodename); +g_free(cpu_nodename); +} + cells = g_new0(uint32_t, s->soc.num_harts * 4); for (cpu = 0; cpu < s->soc.num_harts; cpu++) { nodename = -- 2.21.0