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ehea: Add hugepage detection

PATCH Applied Thomas Klein 2 participants 2 messages Oct 27, 2008

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Thomas Klein

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#0 lore raw

PATCH 1/1 ehea: Add hugepage detection

All kernel memory which is used for kernel/hardware data transfer must be registered with firmware using "memory regions". 16GB hugepages may not be part of a memory region due to firmware restrictions.
This patch modifies the walk_memory_resource callback fn to filter hugepages and add only standard memory to the busmap which is later on used for MR registration.

Signed-off-by Thomas Klein <[email protected]>

---
This reworked patch accounts for comments I got. It's based on davem's net-2.6.git.

drivers/net/ehea/ehea.h +1 -1
diff -Nurp -X dontdiff linux-2.6.27/drivers/net/ehea/ehea.h patched_kernel/drivers/net/ehea/ehea.h
@@ -40,7 +40,7 @@
 #include <asm/io.h>
 
 #define DRV_NAME	"ehea"
-#define DRV_VERSION	"EHEA_0094"
+#define DRV_VERSION	"EHEA_0095"
 
 /* eHEA capability flags */
 #define DLPAR_PORT_ADD_REM 1
drivers/net/ehea/ehea_qmr.c +52 -5

79 lines not on this page · raw message

drivers/net/ehea/ehea_qmr.h +3 -0
diff -Nurp -X dontdiff linux-2.6.27/drivers/net/ehea/ehea_qmr.h patched_kernel/drivers/net/ehea/ehea_qmr.h
@@ -40,6 +40,9 @@
 #define EHEA_PAGESIZE          (1UL << EHEA_PAGESHIFT)
 #define EHEA_SECTSIZE          (1UL << 24)
 #define EHEA_PAGES_PER_SECTION (EHEA_SECTSIZE >> EHEA_PAGESHIFT)
+#define EHEA_HUGEPAGESHIFT     34
+#define EHEA_HUGEPAGE_SIZE     (1UL << EHEA_HUGEPAGESHIFT)
+#define EHEA_HUGEPAGE_PFN_MASK ((EHEA_HUGEPAGE_SIZE - 1) >> PAGE_SHIFT)
 
 #if ((1UL << SECTION_SIZE_BITS) < EHEA_SECTSIZE)
 #error eHEA module cannot work if kernel sectionsize < ehea sectionsize
Applied
#1 lore raw
Quoted 9 lines · Thomas Klein

All kernel memory which is used for kernel/hardware data transfer must be registered with firmware using "memory regions". 16GB hugepages may not be part of a memory region due to firmware restrictions.
This patch modifies the walk_memory_resource callback fn to filter hugepages and add only standard memory to the busmap which is later on used for MR registration.

Signed-off-by Thomas Klein <[email protected]>

---
This reworked patch accounts for comments I got. It's based on davem's net-2.6.git.

applied