| Message ID | 20241101134706.1185-4-gourry@gourry.net |
|---|---|
| State | Superseded |
| Headers | show |
| Series | memory,x86,acpi: hotplug memory alignment advisement | expand |
On Fri, Nov 01, 2024 at 09:47:05AM -0400, Gregory Price wrote: > Capacity is stranded when CFMWS regions are not aligned to block size. > On x86, block size increases with capacity (2G blocks @ 64G capacity). > > Use CFMWS base/size to report memory block size alignment advice. > > Suggested-by: Dan Williams <dan.j.williams@intel.com> > Signed-off-by: Gregory Price <gourry@gourry.net> Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org> > --- > drivers/acpi/numa/srat.c | 12 +++++++++++- > 1 file changed, 11 insertions(+), 1 deletion(-) > > diff --git a/drivers/acpi/numa/srat.c b/drivers/acpi/numa/srat.c > index 44f91f2c6c5d..34b6993e7d6c 100644 > --- a/drivers/acpi/numa/srat.c > +++ b/drivers/acpi/numa/srat.c > @@ -14,6 +14,7 @@ > #include <linux/errno.h> > #include <linux/acpi.h> > #include <linux/memblock.h> > +#include <linux/memory.h> > #include <linux/numa.h> > #include <linux/nodemask.h> > #include <linux/topology.h> > @@ -338,13 +339,22 @@ static int __init acpi_parse_cfmws(union acpi_subtable_headers *header, > { > struct acpi_cedt_cfmws *cfmws; > int *fake_pxm = arg; > - u64 start, end; > + u64 start, end, align; > int node; > > cfmws = (struct acpi_cedt_cfmws *)header; > start = cfmws->base_hpa; > end = cfmws->base_hpa + cfmws->window_size; > > + /* Align memblock size to CFMW regions if possible */ > + align = 1UL << __ffs(start | end); > + if (align >= SZ_256M) { > + if (memory_block_advise_max_size(align) < 0) > + pr_warn("CFMWS: memblock size advise failed\n"); > + } else { > + pr_err("CFMWS: [BIOS BUG] base/size alignment violates spec\n"); > + } > + > /* > * The SRAT may have already described NUMA details for all, > * or a portion of, this CFMWS HPA range. Extend the memblks > -- > 2.43.0 > >
On 01.11.24 14:47, Gregory Price wrote: > Capacity is stranded when CFMWS regions are not aligned to block size. > On x86, block size increases with capacity (2G blocks @ 64G capacity). > > Use CFMWS base/size to report memory block size alignment advice. > > Suggested-by: Dan Williams <dan.j.williams@intel.com> > Signed-off-by: Gregory Price <gourry@gourry.net> > --- Acked-by: David Hildenbrand <david@redhat.com>
diff --git a/drivers/acpi/numa/srat.c b/drivers/acpi/numa/srat.c index 44f91f2c6c5d..34b6993e7d6c 100644 --- a/drivers/acpi/numa/srat.c +++ b/drivers/acpi/numa/srat.c @@ -14,6 +14,7 @@ #include <linux/errno.h> #include <linux/acpi.h> #include <linux/memblock.h> +#include <linux/memory.h> #include <linux/numa.h> #include <linux/nodemask.h> #include <linux/topology.h> @@ -338,13 +339,22 @@ static int __init acpi_parse_cfmws(union acpi_subtable_headers *header, { struct acpi_cedt_cfmws *cfmws; int *fake_pxm = arg; - u64 start, end; + u64 start, end, align; int node; cfmws = (struct acpi_cedt_cfmws *)header; start = cfmws->base_hpa; end = cfmws->base_hpa + cfmws->window_size; + /* Align memblock size to CFMW regions if possible */ + align = 1UL << __ffs(start | end); + if (align >= SZ_256M) { + if (memory_block_advise_max_size(align) < 0) + pr_warn("CFMWS: memblock size advise failed\n"); + } else { + pr_err("CFMWS: [BIOS BUG] base/size alignment violates spec\n"); + } + /* * The SRAT may have already described NUMA details for all, * or a portion of, this CFMWS HPA range. Extend the memblks
Capacity is stranded when CFMWS regions are not aligned to block size. On x86, block size increases with capacity (2G blocks @ 64G capacity). Use CFMWS base/size to report memory block size alignment advice. Suggested-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Gregory Price <gourry@gourry.net> --- drivers/acpi/numa/srat.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-)