Hi,

On Wed, Aug 27, 2025 at 06:11:43PM +0100, James Morse wrote:

Hi Dave,

On 27/08/2025 11:46, Dave Martin wrote:

quoted

Hi,

On Fri, Aug 22, 2025 at 03:29:43PM +0000, James Morse wrote:

quoted

MPAM needs to know the size of a cache associated with a particular CPU.
The DT/ACPI agnostic way of doing this is to ask cacheinfo.

Add a helper to do this.

quoted

quoted

diff --git a/include/linux/cacheinfo.h b/include/linux/cacheinfo.h

[...]

quoted

quoted

+static inline unsigned int get_cpu_cacheinfo_size(int cpu, int level)
+{
+	struct cacheinfo *ci = get_cpu_cacheinfo_level(cpu, level);
+
+	return ci ? ci->size : 0;
+}
+

Orphaned function?

Can fs/resctrl/rdtgroup.c:rdtgroup_cbm_to_size() be ported to use this?
If so, this wouldn't just be dead code in this series.

Ah - I thought the MPAM driver was pulling this value in, but its the resctrl glue code.
I was trying to reduce the number of trees this touches - its probably best to kick this
into the next series that adds the resctrl code as its pretty trivial.


Thanks,

James

Fair enough.

Cheers
---Dave