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Subject[PATCH] [2.6.27] ehea: Fix memory hotplug support
Date
This patch implements the memory notifier to update the busmap instantly
instead of rebuilding the whole map. This is necessary because
walk_memory_resource provides different information than required during memory
hotplug.

Signed-off-by: Hannes Hering <hering2@de.ibm.com>
---
This patch is based on upstream-fixes in the netdev-2.6.git.

diff -Nurp -X dontdiff linux-netdev-2.6/drivers/net/ehea/ehea.h patched_kernel/drivers/net/ehea/ehea.h
--- linux-netdev-2.6/drivers/net/ehea/ehea.h 2008-09-17 16:09:25.729017931 +0200
+++ patched_kernel/drivers/net/ehea/ehea.h 2008-09-17 16:11:26.481026217 +0200
@@ -40,13 +40,13 @@
#include <asm/io.h>

#define DRV_NAME "ehea"
-#define DRV_VERSION "EHEA_0092"
+#define DRV_VERSION "EHEA_0094"

/* eHEA capability flags */
#define DLPAR_PORT_ADD_REM 1
#define DLPAR_MEM_ADD 2
#define DLPAR_MEM_REM 4
-#define EHEA_CAPABILITIES (DLPAR_PORT_ADD_REM | DLPAR_MEM_ADD)
+#define EHEA_CAPABILITIES (DLPAR_PORT_ADD_REM | DLPAR_MEM_ADD | DLPAR_MEM_REM)

#define EHEA_MSG_DEFAULT (NETIF_MSG_LINK | NETIF_MSG_TIMER \
| NETIF_MSG_RX_ERR | NETIF_MSG_TX_ERR)
diff -Nurp -X dontdiff linux-netdev-2.6/drivers/net/ehea/ehea_main.c patched_kernel/drivers/net/ehea/ehea_main.c
--- linux-netdev-2.6/drivers/net/ehea/ehea_main.c 2008-09-17 16:09:25.729017931 +0200
+++ patched_kernel/drivers/net/ehea/ehea_main.c 2008-09-17 16:11:26.481026217 +0200
@@ -2863,7 +2863,7 @@ static void ehea_rereg_mrs(struct work_s
struct ehea_adapter *adapter;

mutex_lock(&dlpar_mem_lock);
- ehea_info("LPAR memory enlarged - re-initializing driver");
+ ehea_info("LPAR memory changed - re-initializing driver");

list_for_each_entry(adapter, &adapter_list, list)
if (adapter->active_ports) {
@@ -2900,13 +2900,6 @@ static void ehea_rereg_mrs(struct work_s
}
}

- ehea_destroy_busmap();
- ret = ehea_create_busmap();
- if (ret) {
- ehea_error("creating ehea busmap failed");
- goto out;
- }
-
clear_bit(__EHEA_STOP_XFER, &ehea_driver_flags);

list_for_each_entry(adapter, &adapter_list, list)
@@ -3519,9 +3512,20 @@ void ehea_crash_handler(void)
static int ehea_mem_notifier(struct notifier_block *nb,
unsigned long action, void *data)
{
+ struct memory_notify *arg = data;
switch (action) {
- case MEM_OFFLINE:
- ehea_info("memory has been removed");
+ case MEM_CANCEL_OFFLINE:
+ ehea_info("memory offlining canceled");
+ case MEM_ONLINE:
+ ehea_info("memory is going online");
+ if (ehea_add_sect_bmap(arg->start_pfn, arg->nr_pages))
+ return NOTIFY_BAD;
+ ehea_rereg_mrs(NULL);
+ break;
+ case MEM_GOING_OFFLINE:
+ ehea_info("memory is going offline");
+ if (ehea_rem_sect_bmap(arg->start_pfn, arg->nr_pages))
+ return NOTIFY_BAD;
ehea_rereg_mrs(NULL);
break;
default:
diff -Nurp -X dontdiff linux-netdev-2.6/drivers/net/ehea/ehea_qmr.c patched_kernel/drivers/net/ehea/ehea_qmr.c
--- linux-netdev-2.6/drivers/net/ehea/ehea_qmr.c 2008-09-17 16:09:25.729017931 +0200
+++ patched_kernel/drivers/net/ehea/ehea_qmr.c 2008-09-17 16:11:26.481026217 +0200
@@ -587,53 +587,81 @@ static inline int ehea_init_bmap(struct
return ehea_init_top_bmap(ehea_bmap->top[top], dir);
}

-static int ehea_create_busmap_callback(unsigned long pfn,
- unsigned long nr_pages, void *arg)
+static DEFINE_MUTEX(ehea_busmap_mutex);
+static unsigned long ehea_mr_len;
+
+#define EHEA_BUSMAP_ADD_SECT 1
+#define EHEA_BUSMAP_REM_SECT 0
+
+static int ehea_update_busmap(unsigned long pfn, unsigned long pgnum, int add)
{
- unsigned long i, mr_len, start_section, end_section;
- start_section = (pfn * PAGE_SIZE) / EHEA_SECTSIZE;
- end_section = start_section + ((nr_pages * PAGE_SIZE) / EHEA_SECTSIZE);
- mr_len = *(unsigned long *)arg;
+ unsigned long i, start_section, end_section;

if (!ehea_bmap)
ehea_bmap = kzalloc(sizeof(struct ehea_bmap), GFP_KERNEL);
if (!ehea_bmap)
return -ENOMEM;

+ start_section = (pfn * PAGE_SIZE) / EHEA_SECTSIZE;
+ end_section = start_section + ((pgnum * PAGE_SIZE) / EHEA_SECTSIZE);
+
for (i = start_section; i < end_section; i++) {
- int ret;
- int top, dir, idx;
u64 vaddr;
+ int top = ehea_calc_index(i, EHEA_TOP_INDEX_SHIFT);
+ int dir = ehea_calc_index(i, EHEA_DIR_INDEX_SHIFT);
+ int idx = i & EHEA_INDEX_MASK;
+
+ int ret = ehea_init_bmap(ehea_bmap, top, dir);
+ if (ret) {
+ if(add) {
+ return ret;
+ } else {
+ continue;
+ }
+ }

- top = ehea_calc_index(i, EHEA_TOP_INDEX_SHIFT);
- dir = ehea_calc_index(i, EHEA_DIR_INDEX_SHIFT);
-
- ret = ehea_init_bmap(ehea_bmap, top, dir);
- if(ret)
- return ret;
-
- idx = i & EHEA_INDEX_MASK;
- vaddr = EHEA_BUSMAP_START + mr_len + i * EHEA_SECTSIZE;
-
+ if (add) {
+ vaddr = EHEA_BUSMAP_START + ehea_mr_len;
+ ehea_mr_len += EHEA_SECTSIZE;
+ } else { /* remove */
+ vaddr = 0;
+ ehea_mr_len -= EHEA_SECTSIZE;
+ }
ehea_bmap->top[top]->dir[dir]->ent[idx] = vaddr;
}
-
- mr_len += nr_pages * PAGE_SIZE;
- *(unsigned long *)arg = mr_len;
-
return 0;
}

-static unsigned long ehea_mr_len;
+int ehea_add_sect_bmap(unsigned long pfn, unsigned long nr_pages)
+{
+ int ret;
+ mutex_lock(&ehea_busmap_mutex);
+ ret = ehea_update_busmap(pfn, nr_pages, EHEA_BUSMAP_ADD_SECT);
+ mutex_unlock(&ehea_busmap_mutex);
+ return ret;
+}

-static DEFINE_MUTEX(ehea_busmap_mutex);
+int ehea_rem_sect_bmap(unsigned long pfn, unsigned long nr_pages)
+{
+ int ret;
+ mutex_lock(&ehea_busmap_mutex);
+ ret = ehea_update_busmap(pfn, nr_pages, EHEA_BUSMAP_REM_SECT);
+ mutex_unlock(&ehea_busmap_mutex);
+ return ret;
+}
+
+static int ehea_create_busmap_callback(unsigned long pfn,
+ unsigned long nr_pages, void *arg)
+{
+ return ehea_update_busmap(pfn, nr_pages, EHEA_BUSMAP_ADD_SECT);
+}

int ehea_create_busmap(void)
{
int ret;
mutex_lock(&ehea_busmap_mutex);
ehea_mr_len = 0;
- ret = walk_memory_resource(0, 1ULL << MAX_PHYSMEM_BITS, &ehea_mr_len,
+ ret = walk_memory_resource(0, 1ULL << MAX_PHYSMEM_BITS, NULL,
ehea_create_busmap_callback);
mutex_unlock(&ehea_busmap_mutex);
return ret;
diff -Nurp -X dontdiff linux-netdev-2.6/drivers/net/ehea/ehea_qmr.h patched_kernel/drivers/net/ehea/ehea_qmr.h
--- linux-netdev-2.6/drivers/net/ehea/ehea_qmr.h 2008-09-17 16:09:25.729017931 +0200
+++ patched_kernel/drivers/net/ehea/ehea_qmr.h 2008-09-17 16:11:26.481026217 +0200
@@ -378,6 +378,8 @@ int ehea_rem_mr(struct ehea_mr *mr);

void ehea_error_data(struct ehea_adapter *adapter, u64 res_handle);

+int ehea_add_sect_bmap(unsigned long pfn, unsigned long nr_pages);
+int ehea_rem_sect_bmap(unsigned long pfn, unsigned long nr_pages);
int ehea_create_busmap(void);
void ehea_destroy_busmap(void);
u64 ehea_map_vaddr(void *caddr);

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