On 07/19/2013 12:59 AM, Tang Chen wrote:
This patch introduce early_acpi_firmware_srat() to find the
phys addr of SRAT provided by firmware. And call it in
reserve_hotpluggable_memory().
Since we have initialized acpi_gbl_root_table_list earlier,
and store all the tables' phys addrs and signatures in it,
it is easy to find the SRAT.
Signed-off-by: Tang Chen <tangchen@xxxxxxxxxxxxxx>
---
drivers/acpi/acpica/tbxface.c | 34 ++++++++++++++++++++++++++++++++++
drivers/acpi/osl.c | 24 ++++++++++++++++++++++++
include/acpi/acpixf.h | 4 ++++
include/linux/acpi.h | 4 ++++
mm/memory_hotplug.c | 10 +++++++---
5 files changed, 73 insertions(+), 3 deletions(-)
diff --git a/drivers/acpi/acpica/tbxface.c b/drivers/acpi/acpica/tbxface.c
index ad11162..95f8d1b 100644
--- a/drivers/acpi/acpica/tbxface.c
+++ b/drivers/acpi/acpica/tbxface.c
@@ -181,6 +181,40 @@ acpi_status acpi_reallocate_root_table(void)
return_ACPI_STATUS(status);
}
+/*
+ * acpi_get_table_desc - Get the acpi table descriptor of a specific table.
+ * @signature: The signature of the table to be found.
+ * @out_desc: The out returned descriptor.
The "@out_desc:" line looks funky. Also, I believe changes to this file
need to go in via acpica & probably conform to their commenting standards?
+ *
+ * This function iterates acpi_gbl_root_table_list and find the specified
+ * table's descriptor.
+ *
+ * NOTE: The caller has the responsibility to allocate memory for @out_desc.
+ *
+ * Return AE_OK on success, AE_NOT_FOUND if the table is not found.
+ */
+acpi_status acpi_get_table_desc(char *signature,
+ struct acpi_table_desc *out_desc)
+{
+ int pos;
+
+ for (pos = 0;
+ pos < acpi_gbl_root_table_list.current_table_count;
+ pos++) {
+ if (!ACPI_COMPARE_NAME
+ (&(acpi_gbl_root_table_list.tables[pos].signature),
+ signature))
+ continue;
+
+ memcpy(out_desc, &acpi_gbl_root_table_list.tables[pos],
+ sizeof(struct acpi_table_desc));
+
+ return_ACPI_STATUS(AE_OK);
+ }
+
+ return_ACPI_STATUS(AE_NOT_FOUND);
+}
+
/*******************************************************************************
*
* FUNCTION: acpi_get_table_header
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index fa6b973..a2e4596 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -53,6 +53,7 @@
#include <acpi/acpi.h>
#include <acpi/acpi_bus.h>
#include <acpi/processor.h>
+#include <acpi/acpixf.h>
#define _COMPONENT ACPI_OS_SERVICES
ACPI_MODULE_NAME("osl");
@@ -750,6 +751,29 @@ void __init acpi_initrd_override(void *data, size_t size)
}
#endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
+#ifdef CONFIG_ACPI_NUMA
+#include <asm/numa.h>
+#include <linux/memblock.h>
+
+/*
+ * early_acpi_firmware_srat - Get the phys addr of SRAT provide by firmware.
s/provide/provided/
+ *
+ * This function iterate acpi_gbl_root_table_list, find SRAT and return the
Perhaps: "Iterate over acpi_gbl_root_table_list to find SRAT then return
its phys addr"
Though I wonder if this comment is even needed, as the iteration is done
in acpi_get_table_desc() (added above).
+ * phys addr of SRAT.
+ *
+ * Return the phys addr of SRAT, or 0 on error.
+ */
+phys_addr_t __init early_acpi_firmware_srat()
+{
+ struct acpi_table_desc table_desc;
+
+ if (acpi_get_table_desc(ACPI_SIG_SRAT, &table_desc))
+ return 0;
+
+ return table_desc.address;
+}
+#endif /* CONFIG_ACPI_NUMA */
+
static void acpi_table_taint(struct acpi_table_header *table)
{
pr_warn(PREFIX
[...]
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 066873e..15b11d3 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -106,10 +106,14 @@ void __init reserve_hotpluggable_memory(void)
{
phys_addr_t srat_paddr;
- /* Try to find if SRAT is overrided */
+ /* Try to find out if SRAT is overrided */
srat_paddr = early_acpi_override_srat();
- if (!srat_paddr)
- return;
+ if (!srat_paddr) {
+ /* Try to find SRAT from firmware if it wasn't overrided */
s/overrided/overridden/
+ srat_paddr = early_acpi_firmware_srat();
+ if (!srat_paddr)
+ return;
+ }
/* Will reserve hotpluggable memory here */
}
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