[v2,16/39] xen/riscv: introduce asm/smp.h

Commit Message

Oleksii Kurochko Nov. 24, 2023, 10:30 a.m. UTC

Signed-off-by: Oleksii Kurochko <[e-mail]>
---
Changes in V2:
 - Nothing changed. Only rebase.
---
 xen/arch/riscv/include/asm/smp.h | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 xen/arch/riscv/include/asm/smp.h

Comments

Jan Beulich Dec. 7, 2023, 3:43 p.m. UTC | #1

On 24.11.2023 11:30, Oleksii Kurochko wrote:
> --- /dev/null
> +++ b/xen/arch/riscv/include/asm/smp.h
> @@ -0,0 +1,23 @@
> +#ifndef __ASM_RISCV_SMP_H
> +#define __ASM_RISCV_SMP_H
> +
> +#ifndef __ASSEMBLY__
> +#include <xen/cpumask.h>
> +#include <xen/percpu.h>
> +#endif

If you want this to be possible to include from assembly files (I don't
know why you would want that), ...

> +DECLARE_PER_CPU(cpumask_var_t, cpu_sibling_mask);
> +DECLARE_PER_CPU(cpumask_var_t, cpu_core_mask);

... these two would also need to live inside the #ifdef. Otherwise the
#ifdef wants dropping.

> +#define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))

Seeing this is now the 4th instance, I guess we want to move it to
xen/smp.h. I'll try to remember making a patch.

> +/*
> + * Do we, for platform reasons, need to actually keep CPUs online when we
> + * would otherwise prefer them to be off?
> + */
> +#define park_offline_cpus false
> +
> +/* TODO: need to be implemeted */
> +#define smp_processor_id() (0)
> +
> +#endif
> \ No newline at end of file

You want to take care of this.

Jan

Oleksii Kurochko Dec. 8, 2023, 9:53 a.m. UTC | #2

On Thu, 2023-12-07 at 16:43 +0100, Jan Beulich wrote:
> On 24.11.2023 11:30, Oleksii Kurochko wrote:
> > --- /dev/null
> > +++ b/xen/arch/riscv/include/asm/smp.h
> > @@ -0,0 +1,23 @@
> > +#ifndef __ASM_RISCV_SMP_H
> > +#define __ASM_RISCV_SMP_H
> > +
> > +#ifndef __ASSEMBLY__
> > +#include <xen/cpumask.h>
> > +#include <xen/percpu.h>
> > +#endif
> 
> If you want this to be possible to include from assembly files (I
> don't
> know why you would want that), ...
> 
> > +DECLARE_PER_CPU(cpumask_var_t, cpu_sibling_mask);
> > +DECLARE_PER_CPU(cpumask_var_t, cpu_core_mask);
> 
> ... these two would also need to live inside the #ifdef. Otherwise
> the
> #ifdef wants dropping.
I think we can just drop $ifdef. I am not sure that this header will be
used in assembly code.

> 
> > +#define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
> 
> Seeing this is now the 4th instance, I guess we want to move it to
> xen/smp.h. I'll try to remember making a patch.
It will be nice.

Thanks.

> 
> > +/*
> > + * Do we, for platform reasons, need to actually keep CPUs online
> > when we
> > + * would otherwise prefer them to be off?
> > + */
> > +#define park_offline_cpus false
> > +
> > +/* TODO: need to be implemeted */
> > +#define smp_processor_id() (0)
> > +
> > +#endif
> > \ No newline at end of file
> 
> You want to take care of this.
Sure. I'll add a newline. Thanks for noticing that.

> 
~ Oleksii

Patch

diff --git a/xen/arch/riscv/include/asm/smp.h b/xen/arch/riscv/include/asm/smp.h
new file mode 100644
index 0000000000..a7b4f94ce4
--- /dev/null
+++ b/xen/arch/riscv/include/asm/smp.h
@@ -0,0 +1,23 @@ 
+#ifndef __ASM_RISCV_SMP_H
+#define __ASM_RISCV_SMP_H
+
+#ifndef __ASSEMBLY__
+#include <xen/cpumask.h>
+#include <xen/percpu.h>
+#endif
+
+DECLARE_PER_CPU(cpumask_var_t, cpu_sibling_mask);
+DECLARE_PER_CPU(cpumask_var_t, cpu_core_mask);
+
+#define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
+
+/*
+ * Do we, for platform reasons, need to actually keep CPUs online when we
+ * would otherwise prefer them to be off?
+ */
+#define park_offline_cpus false
+
+/* TODO: need to be implemeted */
+#define smp_processor_id() (0)
+
+#endif
\ No newline at end of file