| Message ID | 20211018030736.443752-1-alison.schofield@intel.com (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | [v2] ACPI: NUMA: Add a node and memblk for each CFMWS not in SRAT | expand |
On 21-10-17 20:07:36, alison.schofield@intel.com wrote: > From: Alison Schofield <alison.schofield@intel.com> > > During NUMA init, CXL memory defined in the SRAT Memory Affinity > subtable may be assigned to a NUMA node. Since there is no > requirement that the SRAT be comprehensive for CXL memory another > mechanism is needed to assign NUMA nodes to CXL memory not identified > in the SRAT. > > Use the CXL Fixed Memory Window Structure (CFMWS) of the ACPI CXL > Early Discovery Table (CEDT) to find all CXL memory ranges. > Create a NUMA node for each CFMWS that is not already assigned to > a NUMA node. Add a memblk attaching its host physical address > range to the node. > > Note that these ranges may not actually map any memory at boot time. > They may describe persistent capacity or may be present to enable > hot-plug. > > Consumers can use phys_to_target_node() to discover the NUMA node. > > Signed-off-by: Alison Schofield <alison.schofield@intel.com> > --- > > Changes in v2: > - Use MAX_NUMNODES as max value when searching node_to_pxm_map() (0-day) > - Add braces around single statement for loop (coding style) > - Rename acpi_parse_cfmws() to acpi_cxl_cfmws_init to be more like other > functions in this file doing similar work. > - Comments: remove superflous and state importance of the init order, > CFMWS after SRAT, (Ira, Dan) > - Add prototype for numa_add_memblk() (0-day) > > > drivers/acpi/numa/srat.c | 70 ++++++++++++++++++++++++++++++++++++++++ > drivers/cxl/acpi.c | 8 +++-- > include/linux/acpi.h | 1 + > 3 files changed, 76 insertions(+), 3 deletions(-) > > diff --git a/drivers/acpi/numa/srat.c b/drivers/acpi/numa/srat.c > index b8795fc49097..4d26a4208af0 100644 > --- a/drivers/acpi/numa/srat.c > +++ b/drivers/acpi/numa/srat.c > @@ -300,6 +300,67 @@ acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma) > } > #endif /* defined(CONFIG_X86) || defined (CONFIG_ARM64) */ > > +static int __init acpi_cxl_cfmws_init(struct acpi_table_header *acpi_cedt) > +{ > + struct acpi_cedt_cfmws *cfmws; > + acpi_size len, cur = 0; > + void *cedt_subtable; > + int i, pxm, node; > + u64 start, end; > + > + /* Find the max PXM defined in the SRAT */ > + for (i = 0; i < MAX_NUMNODES - 1; i++) { > + if (node_to_pxm_map[i] > pxm) Doesn't pxm need to be initialized to something for this to work in the first iteration? > + pxm = node_to_pxm_map[i]; > + } > + /* Start assigning fake PXM values after the SRAT max PXM */ > + pxm++; > + > + len = acpi_cedt->length - sizeof(*acpi_cedt); > + cedt_subtable = acpi_cedt + 1; > + Is there any way at all to share this with acpi.c from the CXL driver? > + while (cur < len) { > + struct acpi_cedt_header *c = cedt_subtable + cur; > + > + if (c->type != ACPI_CEDT_TYPE_CFMWS) > + goto next; > + > + cfmws = cedt_subtable + cur; > + if (cfmws->header.length < sizeof(*cfmws)) { > + pr_warn_once("CFMWS entry skipped:invalid length:%u\n", > + cfmws->header.length); > + goto next; > + } > + > + start = cfmws->base_hpa; > + end = cfmws->base_hpa + cfmws->window_size; > + > + /* > + * Skip if the SRAT already described > + * the NUMA details for this HPA. > + */ > + node = phys_to_target_node(start); > + if (node != NUMA_NO_NODE) > + goto next; > + > + node = acpi_map_pxm_to_node(pxm); > + if (node == NUMA_NO_NODE) { > + pr_err("ACPI NUMA: Too many proximity domains.\n"); > + return -EINVAL; > + } > + > + if (numa_add_memblk(node, start, end) < 0) { > + /* CXL driver must handle the NUMA_NO_NODE case */ > + pr_warn("ACPI NUMA: Failed to add memblk for CFMWS node %d [mem %#llx-%#llx]\n", > + node, start, end); > + } > + pxm++; > +next: > + cur += c->length; > + } > + return 0; > +} > + > static int __init acpi_parse_slit(struct acpi_table_header *table) > { > struct acpi_table_slit *slit = (struct acpi_table_slit *)table; > @@ -478,6 +539,15 @@ int __init acpi_numa_init(void) > /* SLIT: System Locality Information Table */ > acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit); > > + /* > + * CEDT: CXL Fixed Memory Window Structures (CFMWS) > + * must be parsed after the SRAT. It creates NUMA > + * Nodes for CXL memory ranges not already defined > + * in the SRAT and it assigns PXMs after the max PXM > + * defined in the SRAT. > + */ > + acpi_table_parse(ACPI_SIG_CEDT, acpi_cxl_cfmws_init); > + > if (cnt < 0) > return cnt; > else if (!parsed_numa_memblks) > diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c > index 54e9d4d2cf5f..02f765a494b1 100644 > --- a/drivers/cxl/acpi.c > +++ b/drivers/cxl/acpi.c > @@ -122,9 +122,11 @@ static void cxl_add_cfmws_decoders(struct device *dev, > cfmws->base_hpa, cfmws->base_hpa + > cfmws->window_size - 1); > } else { > - dev_dbg(dev, "add: %s range %#llx-%#llx\n", > - dev_name(&cxld->dev), cfmws->base_hpa, > - cfmws->base_hpa + cfmws->window_size - 1); > + dev_dbg(dev, "add: %s node: %d range %#llx-%#llx\n", > + dev_name(&cxld->dev), > + phys_to_target_node(cxld->range.start), > + cfmws->base_hpa, > + cfmws->base_hpa + cfmws->window_size - 1); > } > cur += c->length; > } > diff --git a/include/linux/acpi.h b/include/linux/acpi.h > index 974d497a897d..f837fd715440 100644 > --- a/include/linux/acpi.h > +++ b/include/linux/acpi.h > @@ -426,6 +426,7 @@ extern bool acpi_osi_is_win8(void); > #ifdef CONFIG_ACPI_NUMA > int acpi_map_pxm_to_node(int pxm); > int acpi_get_node(acpi_handle handle); > +int __init numa_add_memblk(int nodeid, u64 start, u64 end); > > /** > * pxm_to_online_node - Map proximity ID to online node > > base-commit: 64570fbc14f8d7cb3fe3995f20e26bc25ce4b2cc > -- > 2.31.1 >
On Mon, Oct 18, 2021 at 09:10:39PM -0700, Ben Widawsky wrote: > On 21-10-17 20:07:36, alison.schofield@intel.com wrote: > > From: Alison Schofield <alison.schofield@intel.com> > > > > During NUMA init, CXL memory defined in the SRAT Memory Affinity > > subtable may be assigned to a NUMA node. Since there is no > > requirement that the SRAT be comprehensive for CXL memory another > > mechanism is needed to assign NUMA nodes to CXL memory not identified > > in the SRAT. > > > > Use the CXL Fixed Memory Window Structure (CFMWS) of the ACPI CXL > > Early Discovery Table (CEDT) to find all CXL memory ranges. > > Create a NUMA node for each CFMWS that is not already assigned to > > a NUMA node. Add a memblk attaching its host physical address > > range to the node. > > > > Note that these ranges may not actually map any memory at boot time. > > They may describe persistent capacity or may be present to enable > > hot-plug. > > > > Consumers can use phys_to_target_node() to discover the NUMA node. > > > > Signed-off-by: Alison Schofield <alison.schofield@intel.com> > > --- > > > > Changes in v2: > > - Use MAX_NUMNODES as max value when searching node_to_pxm_map() (0-day) > > - Add braces around single statement for loop (coding style) > > - Rename acpi_parse_cfmws() to acpi_cxl_cfmws_init to be more like other > > functions in this file doing similar work. > > - Comments: remove superflous and state importance of the init order, > > CFMWS after SRAT, (Ira, Dan) > > - Add prototype for numa_add_memblk() (0-day) > > > > > > drivers/acpi/numa/srat.c | 70 ++++++++++++++++++++++++++++++++++++++++ > > drivers/cxl/acpi.c | 8 +++-- > > include/linux/acpi.h | 1 + > > 3 files changed, 76 insertions(+), 3 deletions(-) > > > > diff --git a/drivers/acpi/numa/srat.c b/drivers/acpi/numa/srat.c > > index b8795fc49097..4d26a4208af0 100644 > > --- a/drivers/acpi/numa/srat.c > > +++ b/drivers/acpi/numa/srat.c > > @@ -300,6 +300,67 @@ acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma) > > } > > #endif /* defined(CONFIG_X86) || defined (CONFIG_ARM64) */ > > > > +static int __init acpi_cxl_cfmws_init(struct acpi_table_header *acpi_cedt) > > +{ > > + struct acpi_cedt_cfmws *cfmws; > > + acpi_size len, cur = 0; > > + void *cedt_subtable; > > + int i, pxm, node; > > + u64 start, end; > > + > > + /* Find the max PXM defined in the SRAT */ > > + for (i = 0; i < MAX_NUMNODES - 1; i++) { > > + if (node_to_pxm_map[i] > pxm) > > Doesn't pxm need to be initialized to something for this to work in the first > iteration? > Thanks for the review Ben - Yes. This needs to be initialized to 0. Behavior now is undefined, only zero by chance. > > + pxm = node_to_pxm_map[i]; > > + } > > + /* Start assigning fake PXM values after the SRAT max PXM */ > > + pxm++; > > + > > + len = acpi_cedt->length - sizeof(*acpi_cedt); > > + cedt_subtable = acpi_cedt + 1; > > + > > Is there any way at all to share this with acpi.c from the CXL driver? > > > + while (cur < len) { > > + struct acpi_cedt_header *c = cedt_subtable + cur; > > + > > + if (c->type != ACPI_CEDT_TYPE_CFMWS) > > + goto next; > > + > > + cfmws = cedt_subtable + cur; > > + if (cfmws->header.length < sizeof(*cfmws)) { > > + pr_warn_once("CFMWS entry skipped:invalid length:%u\n", > > + cfmws->header.length); > > + goto next; > > + } > > + > > + start = cfmws->base_hpa; > > + end = cfmws->base_hpa + cfmws->window_size; > > + > > + /* > > + * Skip if the SRAT already described > > + * the NUMA details for this HPA. > > + */ > > + node = phys_to_target_node(start); > > + if (node != NUMA_NO_NODE) > > + goto next; > > + > > + node = acpi_map_pxm_to_node(pxm); > > + if (node == NUMA_NO_NODE) { > > + pr_err("ACPI NUMA: Too many proximity domains.\n"); > > + return -EINVAL; > > + } > > + > > + if (numa_add_memblk(node, start, end) < 0) { > > + /* CXL driver must handle the NUMA_NO_NODE case */ > > + pr_warn("ACPI NUMA: Failed to add memblk for CFMWS node %d [mem %#llx-%#llx]\n", > > + node, start, end); > > + } > > + pxm++; > > +next: > > + cur += c->length; > > + } > > + return 0; > > +} > > + > > static int __init acpi_parse_slit(struct acpi_table_header *table) > > { > > struct acpi_table_slit *slit = (struct acpi_table_slit *)table; > > @@ -478,6 +539,15 @@ int __init acpi_numa_init(void) > > /* SLIT: System Locality Information Table */ > > acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit); > > > > + /* > > + * CEDT: CXL Fixed Memory Window Structures (CFMWS) > > + * must be parsed after the SRAT. It creates NUMA > > + * Nodes for CXL memory ranges not already defined > > + * in the SRAT and it assigns PXMs after the max PXM > > + * defined in the SRAT. > > + */ > > + acpi_table_parse(ACPI_SIG_CEDT, acpi_cxl_cfmws_init); > > + > > if (cnt < 0) > > return cnt; > > else if (!parsed_numa_memblks) > > diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c > > index 54e9d4d2cf5f..02f765a494b1 100644 > > --- a/drivers/cxl/acpi.c > > +++ b/drivers/cxl/acpi.c > > @@ -122,9 +122,11 @@ static void cxl_add_cfmws_decoders(struct device *dev, > > cfmws->base_hpa, cfmws->base_hpa + > > cfmws->window_size - 1); > > } else { > > - dev_dbg(dev, "add: %s range %#llx-%#llx\n", > > - dev_name(&cxld->dev), cfmws->base_hpa, > > - cfmws->base_hpa + cfmws->window_size - 1); > > + dev_dbg(dev, "add: %s node: %d range %#llx-%#llx\n", > > + dev_name(&cxld->dev), > > + phys_to_target_node(cxld->range.start), > > + cfmws->base_hpa, > > + cfmws->base_hpa + cfmws->window_size - 1); > > } > > cur += c->length; > > } > > diff --git a/include/linux/acpi.h b/include/linux/acpi.h > > index 974d497a897d..f837fd715440 100644 > > --- a/include/linux/acpi.h > > +++ b/include/linux/acpi.h > > @@ -426,6 +426,7 @@ extern bool acpi_osi_is_win8(void); > > #ifdef CONFIG_ACPI_NUMA > > int acpi_map_pxm_to_node(int pxm); > > int acpi_get_node(acpi_handle handle); > > +int __init numa_add_memblk(int nodeid, u64 start, u64 end); > > > > /** > > * pxm_to_online_node - Map proximity ID to online node > > > > base-commit: 64570fbc14f8d7cb3fe3995f20e26bc25ce4b2cc > > -- > > 2.31.1 > >
diff --git a/drivers/acpi/numa/srat.c b/drivers/acpi/numa/srat.c index b8795fc49097..4d26a4208af0 100644 --- a/drivers/acpi/numa/srat.c +++ b/drivers/acpi/numa/srat.c @@ -300,6 +300,67 @@ acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma) } #endif /* defined(CONFIG_X86) || defined (CONFIG_ARM64) */ +static int __init acpi_cxl_cfmws_init(struct acpi_table_header *acpi_cedt) +{ + struct acpi_cedt_cfmws *cfmws; + acpi_size len, cur = 0; + void *cedt_subtable; + int i, pxm, node; + u64 start, end; + + /* Find the max PXM defined in the SRAT */ + for (i = 0; i < MAX_NUMNODES - 1; i++) { + if (node_to_pxm_map[i] > pxm) + pxm = node_to_pxm_map[i]; + } + /* Start assigning fake PXM values after the SRAT max PXM */ + pxm++; + + len = acpi_cedt->length - sizeof(*acpi_cedt); + cedt_subtable = acpi_cedt + 1; + + while (cur < len) { + struct acpi_cedt_header *c = cedt_subtable + cur; + + if (c->type != ACPI_CEDT_TYPE_CFMWS) + goto next; + + cfmws = cedt_subtable + cur; + if (cfmws->header.length < sizeof(*cfmws)) { + pr_warn_once("CFMWS entry skipped:invalid length:%u\n", + cfmws->header.length); + goto next; + } + + start = cfmws->base_hpa; + end = cfmws->base_hpa + cfmws->window_size; + + /* + * Skip if the SRAT already described + * the NUMA details for this HPA. + */ + node = phys_to_target_node(start); + if (node != NUMA_NO_NODE) + goto next; + + node = acpi_map_pxm_to_node(pxm); + if (node == NUMA_NO_NODE) { + pr_err("ACPI NUMA: Too many proximity domains.\n"); + return -EINVAL; + } + + if (numa_add_memblk(node, start, end) < 0) { + /* CXL driver must handle the NUMA_NO_NODE case */ + pr_warn("ACPI NUMA: Failed to add memblk for CFMWS node %d [mem %#llx-%#llx]\n", + node, start, end); + } + pxm++; +next: + cur += c->length; + } + return 0; +} + static int __init acpi_parse_slit(struct acpi_table_header *table) { struct acpi_table_slit *slit = (struct acpi_table_slit *)table; @@ -478,6 +539,15 @@ int __init acpi_numa_init(void) /* SLIT: System Locality Information Table */ acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit); + /* + * CEDT: CXL Fixed Memory Window Structures (CFMWS) + * must be parsed after the SRAT. It creates NUMA + * Nodes for CXL memory ranges not already defined + * in the SRAT and it assigns PXMs after the max PXM + * defined in the SRAT. + */ + acpi_table_parse(ACPI_SIG_CEDT, acpi_cxl_cfmws_init); + if (cnt < 0) return cnt; else if (!parsed_numa_memblks) diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c index 54e9d4d2cf5f..02f765a494b1 100644 --- a/drivers/cxl/acpi.c +++ b/drivers/cxl/acpi.c @@ -122,9 +122,11 @@ static void cxl_add_cfmws_decoders(struct device *dev, cfmws->base_hpa, cfmws->base_hpa + cfmws->window_size - 1); } else { - dev_dbg(dev, "add: %s range %#llx-%#llx\n", - dev_name(&cxld->dev), cfmws->base_hpa, - cfmws->base_hpa + cfmws->window_size - 1); + dev_dbg(dev, "add: %s node: %d range %#llx-%#llx\n", + dev_name(&cxld->dev), + phys_to_target_node(cxld->range.start), + cfmws->base_hpa, + cfmws->base_hpa + cfmws->window_size - 1); } cur += c->length; } diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 974d497a897d..f837fd715440 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -426,6 +426,7 @@ extern bool acpi_osi_is_win8(void); #ifdef CONFIG_ACPI_NUMA int acpi_map_pxm_to_node(int pxm); int acpi_get_node(acpi_handle handle); +int __init numa_add_memblk(int nodeid, u64 start, u64 end); /** * pxm_to_online_node - Map proximity ID to online node