Commit 93155c7a authored by Wang ShaoBo's avatar Wang ShaoBo Committed by Zheng Zengkai
Browse files

arm64/mpam: Add helper for getting MSCs' configuration 



hulk inclusion
category: feature
feature: ARM MPAM support
bugzilla: 48265
CVE: NA

--------------------------------

resctrl sysfs need to show MSCs' configuration applied, we can get this
intermediate data from mpam config structure live in each component
straightforwardly, but for safety we look at the exact value of those
registers in any cases, althought it will spend a few time.

We add independent helper separated from do_device_sync() according to
James' implementation, purposely reading single device for one component,
it is because all devices in one component will be uniformly configured
in one configuration process, so reading single device is sufficient for
getting each component's configuration.

Signed-off-by: default avatarWang ShaoBo <bobo.shaobowang@huawei.com>
Reviewed-by: default avatarXiongfeng Wang <wangxiongfeng2@huawei.com>
Reviewed-by: default avatarCheng Jian <cj.chengjian@huawei.com>
Signed-off-by: default avatarYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: default avatarZheng Zengkai <zhengzengkai@huawei.com>
parent f0218c23

arch/arm64/kernel/mpam/mpam_device.c

+73 −0
Original line number Diff line number Diff line
@@ -1318,3 +1318,76 @@ int mpam_component_mon(struct mpam_component *comp, 


	return ret;

}



static void mpam_component_read_mpamcfg(void *_ctx)

{

	unsigned long flags;

	struct mpam_device *dev;

	struct mpam_device_sync *ctx = (struct mpam_device_sync *)_ctx;

	struct mpam_component *comp = ctx->comp;

	struct sync_args *args = ctx->args;

	u64 val;

	u16 reg;

	u32 partid;



	if (!args)

		return;



	reg = args->reg;

	/*

	 * args->partid is possible reqpartid or intpartid,

	 * if narrow enabled, it should be intpartid.

	 */

	partid = args->partid;



	list_for_each_entry(dev, &comp->devices, comp_list) {

		if (!cpumask_test_cpu(smp_processor_id(),

			&dev->online_affinity))

			continue;



		spin_lock_irqsave(&dev->lock, flags);

		if (mpam_has_feature(mpam_feat_part_nrw, dev->features))

			partid = PART_SEL_SET_INTERNAL(partid);

		mpam_write_reg(dev, MPAMCFG_PART_SEL, partid);

		wmb();

		val = mpam_read_reg(dev, reg);

		atomic64_add(val, &ctx->cfg_value);

		spin_unlock_irqrestore(&dev->lock, flags);



		break;

	}

}



/*

 * reading first device of the this component is enough

 * for getting configuration.

 */

static void

mpam_component_get_config_local(struct mpam_component *comp,

				struct sync_args *args, u32 *result)

{

	int cpu;

	struct mpam_device *dev;

	struct mpam_device_sync sync_ctx;



	sync_ctx.args = args;

	sync_ctx.comp = comp;

	atomic64_set(&sync_ctx.cfg_value, 0);



	dev = list_first_entry_or_null(&comp->devices,

				struct mpam_device, comp_list);

	if (WARN_ON(!dev))

		return;



	cpu = cpumask_any(&dev->online_affinity);

	smp_call_function_single(cpu, mpam_component_read_mpamcfg, &sync_ctx, 1);



	if (result)

		*result = atomic64_read(&sync_ctx.cfg_value);

}



void mpam_component_get_config(struct mpam_component *comp,

			struct sync_args *args, u32 *result)

{

	mpam_component_get_config_local(comp, args, result);

}

arch/arm64/kernel/mpam/mpam_internal.h

+3 −0
Original line number Diff line number Diff line
@@ -162,6 +162,9 @@ int mpam_component_config(struct mpam_component *comp, 
int mpam_component_mon(struct mpam_component *comp,

			struct sync_args *args, u64 *result);



void mpam_component_get_config(struct mpam_component *comp,

			struct sync_args *args, u32 *result);



u16 mpam_sysprops_num_partid(void);

u16 mpam_sysprops_num_pmg(void);