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Date:   Fri, 18 Oct 2019 13:46:56 +0100
From:   Jonathan Cameron <jonathan.cameron@huawei.com>
To:     "Rafael J. Wysocki" <rjw@rjwysocki.net>
CC:     <linux-mm@kvack.org>, <linux-acpi@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>, <x86@kernel.org>,
        Keith Busch <keith.busch@intel.com>, <jglisse@redhat.com>,
        <linuxarm@huawei.com>, Andrew Morton <akpm@linux-foundation.org>,
        "Dan Williams" <dan.j.williams@intel.com>
Subject: Re: [PATCH V5 1/4] ACPI: Support Generic Initiator only domains
Message-ID: <20191018134656.00000f70@huawei.com>
In-Reply-To: <1895971.7mY3IlW731@kreacher>
References: <20191004114330.104746-1-Jonathan.Cameron@huawei.com>
        <20191004114330.104746-2-Jonathan.Cameron@huawei.com>
        <1895971.7mY3IlW731@kreacher>
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On Fri, 18 Oct 2019 12:18:33 +0200
"Rafael J. Wysocki" <rjw@rjwysocki.net> wrote:

> On Friday, October 4, 2019 1:43:27 PM CEST Jonathan Cameron wrote:
> > Generic Initiators are a new ACPI concept that allows for the
> > description of proximity domains that contain a device which
> > performs memory access (such as a network card) but neither
> > host CPU nor Memory.
> > 
> > This patch has the parsing code and provides the infrastructure
> > for an architecture to associate these new domains with their
> > nearest memory processing node.
> > 
> > Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>  
> 
> This depends on the series from Dan at:
> 
> https://lore.kernel.org/linux-acpi/CAPcyv4gBSX58CWH4HZ28w0_cZRzJrhgdEFHa2g8KDqyv8aFqZQ@mail.gmail.com/T/#m1acce3ae8f29f680c0d95fd1e840e703949fbc48
> 
Hi Rafael,

Yes. Cover letter mentions it was rebased on v4 of that series.

> AFAICS, so please respin when that one hits the Linus' tree.

Sure, though that pushes it out another cycle and it's beginning to
get a bit silly (just rebases since April).

I guess it can't be helped given the series hits several trees.

Note that this version applies completely clean on top of V7 of
Dan's SPM/hmem set applied to the tip tree (which I assume is the
route that will take).  Hence, unless something else changes, the
respin will be identical to this version.

Thanks,

Jonathan

> 
> > ---
> >  drivers/acpi/numa/srat.c       | 62 +++++++++++++++++++++++++++++++++-
> >  drivers/base/node.c            |  3 ++
> >  include/asm-generic/topology.h |  3 ++
> >  include/linux/nodemask.h       |  1 +
> >  include/linux/topology.h       |  7 ++++
> >  5 files changed, 75 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/acpi/numa/srat.c b/drivers/acpi/numa/srat.c
> > index eadbf90e65d1..fe34315a9234 100644
> > --- a/drivers/acpi/numa/srat.c
> > +++ b/drivers/acpi/numa/srat.c
> > @@ -170,6 +170,38 @@ acpi_table_print_srat_entry(struct acpi_subtable_header *header)
> >  		}
> >  		break;
> >  
> > +	case ACPI_SRAT_TYPE_GENERIC_AFFINITY:
> > +	{
> > +		struct acpi_srat_generic_affinity *p =
> > +			(struct acpi_srat_generic_affinity *)header;
> > +		char name[9] = {};
> > +
> > +		if (p->device_handle_type == 0) {
> > +			/*
> > +			 * For pci devices this may be the only place they
> > +			 * are assigned a proximity domain
> > +			 */
> > +			pr_debug("SRAT Generic Initiator(Seg:%u BDF:%u) in proximity domain %d %s\n",
> > +				 *(u16 *)(&p->device_handle[0]),
> > +				 *(u16 *)(&p->device_handle[2]),
> > +				 p->proximity_domain,
> > +				 (p->flags & ACPI_SRAT_GENERIC_AFFINITY_ENABLED) ?
> > +				"enabled" : "disabled");
> > +		} else {
> > +			/*
> > +			 * In this case we can rely on the device having a
> > +			 * proximity domain reference
> > +			 */
> > +			memcpy(name, p->device_handle, 8);
> > +			pr_info("SRAT Generic Initiator(HID=%.8s UID=%.4s) in proximity domain %d %s\n",
> > +				(char *)(&p->device_handle[0]),
> > +				(char *)(&p->device_handle[8]),
> > +				p->proximity_domain,
> > +				(p->flags & ACPI_SRAT_GENERIC_AFFINITY_ENABLED) ?
> > +				"enabled" : "disabled");
> > +		}
> > +	}
> > +	break;
> >  	default:
> >  		pr_warn("Found unsupported SRAT entry (type = 0x%x)\n",
> >  			header->type);
> > @@ -378,6 +410,32 @@ acpi_parse_gicc_affinity(union acpi_subtable_headers *header,
> >  	return 0;
> >  }
> >  
> > +static int __init
> > +acpi_parse_gi_affinity(union acpi_subtable_headers *header,
> > +		       const unsigned long end)
> > +{
> > +	struct acpi_srat_generic_affinity *gi_affinity;
> > +	int node;
> > +
> > +	gi_affinity = (struct acpi_srat_generic_affinity *)header;
> > +	if (!gi_affinity)
> > +		return -EINVAL;
> > +	acpi_table_print_srat_entry(&header->common);
> > +
> > +	if (!(gi_affinity->flags & ACPI_SRAT_GENERIC_AFFINITY_ENABLED))
> > +		return -EINVAL;
> > +
> > +	node = acpi_map_pxm_to_node(gi_affinity->proximity_domain);
> > +	if (node == NUMA_NO_NODE || node >= MAX_NUMNODES) {
> > +		pr_err("SRAT: Too many proximity domains.\n");
> > +		return -EINVAL;
> > +	}
> > +	node_set(node, numa_nodes_parsed);
> > +	node_set_state(node, N_GENERIC_INITIATOR);
> > +
> > +	return 0;
> > +}
> > +
> >  static int __initdata parsed_numa_memblks;
> >  
> >  static int __init
> > @@ -433,7 +491,7 @@ int __init acpi_numa_init(void)
> >  
> >  	/* SRAT: System Resource Affinity Table */
> >  	if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
> > -		struct acpi_subtable_proc srat_proc[3];
> > +		struct acpi_subtable_proc srat_proc[4];
> >  
> >  		memset(srat_proc, 0, sizeof(srat_proc));
> >  		srat_proc[0].id = ACPI_SRAT_TYPE_CPU_AFFINITY;
> > @@ -442,6 +500,8 @@ int __init acpi_numa_init(void)
> >  		srat_proc[1].handler = acpi_parse_x2apic_affinity;
> >  		srat_proc[2].id = ACPI_SRAT_TYPE_GICC_AFFINITY;
> >  		srat_proc[2].handler = acpi_parse_gicc_affinity;
> > +		srat_proc[3].id = ACPI_SRAT_TYPE_GENERIC_AFFINITY;
> > +		srat_proc[3].handler = acpi_parse_gi_affinity;
> >  
> >  		acpi_table_parse_entries_array(ACPI_SIG_SRAT,
> >  					sizeof(struct acpi_table_srat),
> > diff --git a/drivers/base/node.c b/drivers/base/node.c
> > index 296546ffed6c..e5863baa8cb6 100644
> > --- a/drivers/base/node.c
> > +++ b/drivers/base/node.c
> > @@ -977,6 +977,8 @@ static struct node_attr node_state_attr[] = {
> >  #endif
> >  	[N_MEMORY] = _NODE_ATTR(has_memory, N_MEMORY),
> >  	[N_CPU] = _NODE_ATTR(has_cpu, N_CPU),
> > +	[N_GENERIC_INITIATOR] = _NODE_ATTR(has_generic_initiator,
> > +					   N_GENERIC_INITIATOR),
> >  };
> >  
> >  static struct attribute *node_state_attrs[] = {
> > @@ -988,6 +990,7 @@ static struct attribute *node_state_attrs[] = {
> >  #endif
> >  	&node_state_attr[N_MEMORY].attr.attr,
> >  	&node_state_attr[N_CPU].attr.attr,
> > +	&node_state_attr[N_GENERIC_INITIATOR].attr.attr,
> >  	NULL
> >  };
> >  
> > diff --git a/include/asm-generic/topology.h b/include/asm-generic/topology.h
> > index 238873739550..54d0b4176a45 100644
> > --- a/include/asm-generic/topology.h
> > +++ b/include/asm-generic/topology.h
> > @@ -71,6 +71,9 @@
> >  #ifndef set_cpu_numa_mem
> >  #define set_cpu_numa_mem(cpu, node)
> >  #endif
> > +#ifndef set_gi_numa_mem
> > +#define set_gi_numa_mem(gi, node)
> > +#endif
> >  
> >  #endif	/* !CONFIG_NUMA || !CONFIG_HAVE_MEMORYLESS_NODES */
> >  
> > diff --git a/include/linux/nodemask.h b/include/linux/nodemask.h
> > index 27e7fa36f707..1aebf766fb52 100644
> > --- a/include/linux/nodemask.h
> > +++ b/include/linux/nodemask.h
> > @@ -399,6 +399,7 @@ enum node_states {
> >  #endif
> >  	N_MEMORY,		/* The node has memory(regular, high, movable) */
> >  	N_CPU,		/* The node has one or more cpus */
> > +	N_GENERIC_INITIATOR,	/* The node is a GI only node */
> >  	NR_NODE_STATES
> >  };
> >  
> > diff --git a/include/linux/topology.h b/include/linux/topology.h
> > index eb2fe6edd73c..05ccf011e489 100644
> > --- a/include/linux/topology.h
> > +++ b/include/linux/topology.h
> > @@ -140,6 +140,13 @@ static inline void set_numa_mem(int node)
> >  }
> >  #endif
> >  
> > +#ifndef set_gi_numa_mem
> > +static inline void set_gi_numa_mem(int gi, int node)
> > +{
> > +	_node_numa_mem_[gi] = node;
> > +}
> > +#endif
> > +
> >  #ifndef node_to_mem_node
> >  static inline int node_to_mem_node(int node)
> >  {
> >   
> 
> 
> 
>