#include <linux/device.h>
#include <linux/init.h>
#include <linux/list.h>
+#include <linux/list_sort.h>
#include <linux/node.h>
#include <linux/sysfs.h>
static __initdata u8 hmat_revision;
+static __initdata LIST_HEAD(targets);
+static __initdata LIST_HEAD(initiators);
+static __initdata LIST_HEAD(localities);
+
+/*
+ * The defined enum order is used to prioritize attributes to break ties when
+ * selecting the best performing node.
+ */
+enum locality_types {
+ WRITE_LATENCY,
+ READ_LATENCY,
+ WRITE_BANDWIDTH,
+ READ_BANDWIDTH,
+};
+
+static struct memory_locality *localities_types[4];
+
+struct memory_target {
+ struct list_head node;
+ unsigned int memory_pxm;
+ unsigned int processor_pxm;
+ struct node_hmem_attrs hmem_attrs;
+};
+
+struct memory_initiator {
+ struct list_head node;
+ unsigned int processor_pxm;
+};
+
+struct memory_locality {
+ struct list_head node;
+ struct acpi_hmat_locality *hmat_loc;
+};
+
+static __init struct memory_initiator *find_mem_initiator(unsigned int cpu_pxm)
+{
+ struct memory_initiator *initiator;
+
+ list_for_each_entry(initiator, &initiators, node)
+ if (initiator->processor_pxm == cpu_pxm)
+ return initiator;
+ return NULL;
+}
+
+static __init struct memory_target *find_mem_target(unsigned int mem_pxm)
+{
+ struct memory_target *target;
+
+ list_for_each_entry(target, &targets, node)
+ if (target->memory_pxm == mem_pxm)
+ return target;
+ return NULL;
+}
+
+static __init void alloc_memory_initiator(unsigned int cpu_pxm)
+{
+ struct memory_initiator *initiator;
+
+ if (pxm_to_node(cpu_pxm) == NUMA_NO_NODE)
+ return;
+
+ initiator = find_mem_initiator(cpu_pxm);
+ if (initiator)
+ return;
+
+ initiator = kzalloc(sizeof(*initiator), GFP_KERNEL);
+ if (!initiator)
+ return;
+
+ initiator->processor_pxm = cpu_pxm;
+ list_add_tail(&initiator->node, &initiators);
+}
+
+static __init void alloc_memory_target(unsigned int mem_pxm)
+{
+ struct memory_target *target;
+
+ if (pxm_to_node(mem_pxm) == NUMA_NO_NODE)
+ return;
+
+ target = find_mem_target(mem_pxm);
+ if (target)
+ return;
+
+ target = kzalloc(sizeof(*target), GFP_KERNEL);
+ if (!target)
+ return;
+
+ target->memory_pxm = mem_pxm;
+ target->processor_pxm = PXM_INVAL;
+ list_add_tail(&target->node, &targets);
+}
+
static __init const char *hmat_data_type(u8 type)
{
switch (type) {
return value;
}
+static __init void hmat_update_target_access(struct memory_target *target,
+ u8 type, u32 value)
+{
+ switch (type) {
+ case ACPI_HMAT_ACCESS_LATENCY:
+ target->hmem_attrs.read_latency = value;
+ target->hmem_attrs.write_latency = value;
+ break;
+ case ACPI_HMAT_READ_LATENCY:
+ target->hmem_attrs.read_latency = value;
+ break;
+ case ACPI_HMAT_WRITE_LATENCY:
+ target->hmem_attrs.write_latency = value;
+ break;
+ case ACPI_HMAT_ACCESS_BANDWIDTH:
+ target->hmem_attrs.read_bandwidth = value;
+ target->hmem_attrs.write_bandwidth = value;
+ break;
+ case ACPI_HMAT_READ_BANDWIDTH:
+ target->hmem_attrs.read_bandwidth = value;
+ break;
+ case ACPI_HMAT_WRITE_BANDWIDTH:
+ target->hmem_attrs.write_bandwidth = value;
+ break;
+ default:
+ break;
+ }
+}
+
+static __init void hmat_add_locality(struct acpi_hmat_locality *hmat_loc)
+{
+ struct memory_locality *loc;
+
+ loc = kzalloc(sizeof(*loc), GFP_KERNEL);
+ if (!loc) {
+ pr_notice_once("Failed to allocate HMAT locality\n");
+ return;
+ }
+
+ loc->hmat_loc = hmat_loc;
+ list_add_tail(&loc->node, &localities);
+
+ switch (hmat_loc->data_type) {
+ case ACPI_HMAT_ACCESS_LATENCY:
+ localities_types[READ_LATENCY] = loc;
+ localities_types[WRITE_LATENCY] = loc;
+ break;
+ case ACPI_HMAT_READ_LATENCY:
+ localities_types[READ_LATENCY] = loc;
+ break;
+ case ACPI_HMAT_WRITE_LATENCY:
+ localities_types[WRITE_LATENCY] = loc;
+ break;
+ case ACPI_HMAT_ACCESS_BANDWIDTH:
+ localities_types[READ_BANDWIDTH] = loc;
+ localities_types[WRITE_BANDWIDTH] = loc;
+ break;
+ case ACPI_HMAT_READ_BANDWIDTH:
+ localities_types[READ_BANDWIDTH] = loc;
+ break;
+ case ACPI_HMAT_WRITE_BANDWIDTH:
+ localities_types[WRITE_BANDWIDTH] = loc;
+ break;
+ default:
+ break;
+ }
+}
+
static __init int hmat_parse_locality(union acpi_subtable_headers *header,
const unsigned long end)
{
struct acpi_hmat_locality *hmat_loc = (void *)header;
+ struct memory_target *target;
unsigned int init, targ, total_size, ipds, tpds;
u32 *inits, *targs, value;
u16 *entries;
- u8 type;
+ u8 type, mem_hier;
if (hmat_loc->header.length < sizeof(*hmat_loc)) {
pr_notice("HMAT: Unexpected locality header length: %d\n",
}
type = hmat_loc->data_type;
+ mem_hier = hmat_loc->flags & ACPI_HMAT_MEMORY_HIERARCHY;
ipds = hmat_loc->number_of_initiator_Pds;
tpds = hmat_loc->number_of_target_Pds;
total_size = sizeof(*hmat_loc) + sizeof(*entries) * ipds * tpds +
targs = inits + ipds;
entries = (u16 *)(targs + tpds);
for (init = 0; init < ipds; init++) {
+ alloc_memory_initiator(inits[init]);
for (targ = 0; targ < tpds; targ++) {
value = hmat_normalize(entries[init * tpds + targ],
hmat_loc->entry_base_unit,
pr_info(" Initiator-Target[%d-%d]:%d%s\n",
inits[init], targs[targ], value,
hmat_data_type_suffix(type));
+
+ if (mem_hier == ACPI_HMAT_MEMORY) {
+ target = find_mem_target(targs[targ]);
+ if (target && target->processor_pxm == inits[init])
+ hmat_update_target_access(target, type, value);
+ }
}
}
+ if (mem_hier == ACPI_HMAT_MEMORY)
+ hmat_add_locality(hmat_loc);
+
return 0;
}
const unsigned long end)
{
struct acpi_hmat_proximity_domain *p = (void *)header;
+ struct memory_target *target;
if (p->header.length != sizeof(*p)) {
pr_notice("HMAT: Unexpected address range header length: %d\n",
pr_info("HMAT: Memory Flags:%04x Processor Domain:%d Memory Domain:%d\n",
p->flags, p->processor_PD, p->memory_PD);
+ if (p->flags & ACPI_HMAT_MEMORY_PD_VALID) {
+ target = find_mem_target(p->memory_PD);
+ if (!target) {
+ pr_debug("HMAT: Memory Domain missing from SRAT\n");
+ return -EINVAL;
+ }
+ }
+ if (target && p->flags & ACPI_HMAT_PROCESSOR_PD_VALID) {
+ int p_node = pxm_to_node(p->processor_PD);
+
+ if (p_node == NUMA_NO_NODE) {
+ pr_debug("HMAT: Invalid Processor Domain\n");
+ return -EINVAL;
+ }
+ target->processor_pxm = p_node;
+ }
+
return 0;
}
}
}
+static __init int srat_parse_mem_affinity(union acpi_subtable_headers *header,
+ const unsigned long end)
+{
+ struct acpi_srat_mem_affinity *ma = (void *)header;
+
+ if (!ma)
+ return -EINVAL;
+ if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
+ return 0;
+ alloc_memory_target(ma->proximity_domain);
+ return 0;
+}
+
+static __init u32 hmat_initiator_perf(struct memory_target *target,
+ struct memory_initiator *initiator,
+ struct acpi_hmat_locality *hmat_loc)
+{
+ unsigned int ipds, tpds, i, idx = 0, tdx = 0;
+ u32 *inits, *targs;
+ u16 *entries;
+
+ ipds = hmat_loc->number_of_initiator_Pds;
+ tpds = hmat_loc->number_of_target_Pds;
+ inits = (u32 *)(hmat_loc + 1);
+ targs = inits + ipds;
+ entries = (u16 *)(targs + tpds);
+
+ for (i = 0; i < ipds; i++) {
+ if (inits[i] == initiator->processor_pxm) {
+ idx = i;
+ break;
+ }
+ }
+
+ if (i == ipds)
+ return 0;
+
+ for (i = 0; i < tpds; i++) {
+ if (targs[i] == target->memory_pxm) {
+ tdx = i;
+ break;
+ }
+ }
+ if (i == tpds)
+ return 0;
+
+ return hmat_normalize(entries[idx * tpds + tdx],
+ hmat_loc->entry_base_unit,
+ hmat_loc->data_type);
+}
+
+static __init bool hmat_update_best(u8 type, u32 value, u32 *best)
+{
+ bool updated = false;
+
+ if (!value)
+ return false;
+
+ switch (type) {
+ case ACPI_HMAT_ACCESS_LATENCY:
+ case ACPI_HMAT_READ_LATENCY:
+ case ACPI_HMAT_WRITE_LATENCY:
+ if (!*best || *best > value) {
+ *best = value;
+ updated = true;
+ }
+ break;
+ case ACPI_HMAT_ACCESS_BANDWIDTH:
+ case ACPI_HMAT_READ_BANDWIDTH:
+ case ACPI_HMAT_WRITE_BANDWIDTH:
+ if (!*best || *best < value) {
+ *best = value;
+ updated = true;
+ }
+ break;
+ }
+
+ return updated;
+}
+
+static int initiator_cmp(void *priv, struct list_head *a, struct list_head *b)
+{
+ struct memory_initiator *ia;
+ struct memory_initiator *ib;
+ unsigned long *p_nodes = priv;
+
+ ia = list_entry(a, struct memory_initiator, node);
+ ib = list_entry(b, struct memory_initiator, node);
+
+ set_bit(ia->processor_pxm, p_nodes);
+ set_bit(ib->processor_pxm, p_nodes);
+
+ return ia->processor_pxm - ib->processor_pxm;
+}
+
+static __init void hmat_register_target_initiators(struct memory_target *target)
+{
+ static DECLARE_BITMAP(p_nodes, MAX_NUMNODES);
+ struct memory_initiator *initiator;
+ unsigned int mem_nid, cpu_nid;
+ struct memory_locality *loc = NULL;
+ u32 best = 0;
+ int i;
+
+ mem_nid = pxm_to_node(target->memory_pxm);
+ /*
+ * If the Address Range Structure provides a local processor pxm, link
+ * only that one. Otherwise, find the best performance attributes and
+ * register all initiators that match.
+ */
+ if (target->processor_pxm != PXM_INVAL) {
+ cpu_nid = pxm_to_node(target->processor_pxm);
+ register_memory_node_under_compute_node(mem_nid, cpu_nid, 0);
+ return;
+ }
+
+ if (list_empty(&localities))
+ return;
+
+ /*
+ * We need the initiator list sorted so we can use bitmap_clear for
+ * previously set initiators when we find a better memory accessor.
+ * We'll also use the sorting to prime the candidate nodes with known
+ * initiators.
+ */
+ bitmap_zero(p_nodes, MAX_NUMNODES);
+ list_sort(p_nodes, &initiators, initiator_cmp);
+ for (i = WRITE_LATENCY; i <= READ_BANDWIDTH; i++) {
+ loc = localities_types[i];
+ if (!loc)
+ continue;
+
+ best = 0;
+ list_for_each_entry(initiator, &initiators, node) {
+ u32 value;
+
+ if (!test_bit(initiator->processor_pxm, p_nodes))
+ continue;
+
+ value = hmat_initiator_perf(target, initiator, loc->hmat_loc);
+ if (hmat_update_best(loc->hmat_loc->data_type, value, &best))
+ bitmap_clear(p_nodes, 0, initiator->processor_pxm);
+ if (value != best)
+ clear_bit(initiator->processor_pxm, p_nodes);
+ }
+ if (best)
+ hmat_update_target_access(target, loc->hmat_loc->data_type, best);
+ }
+
+ for_each_set_bit(i, p_nodes, MAX_NUMNODES) {
+ cpu_nid = pxm_to_node(i);
+ register_memory_node_under_compute_node(mem_nid, cpu_nid, 0);
+ }
+}
+
+static __init void hmat_register_targets(void)
+{
+ struct memory_target *target;
+
+ list_for_each_entry(target, &targets, node)
+ hmat_register_target_initiators(target);
+}
+
+static __init void hmat_free_structures(void)
+{
+ struct memory_target *target, *tnext;
+ struct memory_locality *loc, *lnext;
+ struct memory_initiator *initiator, *inext;
+
+ list_for_each_entry_safe(target, tnext, &targets, node) {
+ list_del(&target->node);
+ kfree(target);
+ }
+
+ list_for_each_entry_safe(initiator, inext, &initiators, node) {
+ list_del(&initiator->node);
+ kfree(initiator);
+ }
+
+ list_for_each_entry_safe(loc, lnext, &localities, node) {
+ list_del(&loc->node);
+ kfree(loc);
+ }
+}
+
static __init int hmat_init(void)
{
struct acpi_table_header *tbl;
if (srat_disabled())
return 0;
+ status = acpi_get_table(ACPI_SIG_SRAT, 0, &tbl);
+ if (ACPI_FAILURE(status))
+ return 0;
+
+ if (acpi_table_parse_entries(ACPI_SIG_SRAT,
+ sizeof(struct acpi_table_srat),
+ ACPI_SRAT_TYPE_MEMORY_AFFINITY,
+ srat_parse_mem_affinity, 0) < 0)
+ goto out_put;
+ acpi_put_table(tbl);
+
status = acpi_get_table(ACPI_SIG_HMAT, 0, &tbl);
if (ACPI_FAILURE(status))
return 0;
goto out_put;
}
}
+ hmat_register_targets();
out_put:
+ hmat_free_structures();
acpi_put_table(tbl);
return 0;
}
projects / linux-platform-drivers-x86.git / commitdiff