arch/x86/kernel/cpu/resctrl/ctrlmondata.c

Source file repositories/reference/linux-study-clean/arch/x86/kernel/cpu/resctrl/ctrlmondata.c

File Facts

System
Linux kernel
Corpus path
arch/x86/kernel/cpu/resctrl/ctrlmondata.c
Extension
.c
Size
3495 bytes
Lines
134
Domain
Architecture Layer
Bucket
arch/x86
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

if (!msr_param.res) {
				msr_param.low = idx;
				msr_param.high = msr_param.low + 1;
				msr_param.res = r;
				msr_param.dom = d;
			} else {
				msr_param.low = min(msr_param.low, idx);
				msr_param.high = max(msr_param.high, idx + 1);
			}
		}
		if (msr_param.res)
			smp_call_function_any(&d->hdr.cpu_mask, rdt_ctrl_update, &msr_param, 1);
	}

	return 0;
}

u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_ctrl_domain *d,
			    u32 closid, enum resctrl_conf_type type)
{
	struct rdt_hw_ctrl_domain *hw_dom = resctrl_to_arch_ctrl_dom(d);
	u32 idx = resctrl_get_config_index(closid, type);

	return hw_dom->ctrl_val[idx];
}

bool resctrl_arch_get_io_alloc_enabled(struct rdt_resource *r)
{
	return resctrl_to_arch_res(r)->sdciae_enabled;
}

static void resctrl_sdciae_set_one_amd(void *arg)
{
	bool *enable = arg;

	if (*enable)
		msr_set_bit(MSR_IA32_L3_QOS_EXT_CFG, SDCIAE_ENABLE_BIT);
	else
		msr_clear_bit(MSR_IA32_L3_QOS_EXT_CFG, SDCIAE_ENABLE_BIT);
}

static void _resctrl_sdciae_enable(struct rdt_resource *r, bool enable)
{
	struct rdt_ctrl_domain *d;

	/* Walking r->ctrl_domains, ensure it can't race with cpuhp */
	lockdep_assert_cpus_held();

	/* Update MSR_IA32_L3_QOS_EXT_CFG MSR on all the CPUs in all domains */
	list_for_each_entry(d, &r->ctrl_domains, hdr.list)
		on_each_cpu_mask(&d->hdr.cpu_mask, resctrl_sdciae_set_one_amd, &enable, 1);
}

int resctrl_arch_io_alloc_enable(struct rdt_resource *r, bool enable)
{
	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);

	if (hw_res->r_resctrl.cache.io_alloc_capable &&
	    hw_res->sdciae_enabled != enable) {
		_resctrl_sdciae_enable(r, enable);
		hw_res->sdciae_enabled = enable;
	}

	return 0;
}

Annotation

Implementation Notes