ehea: Fix memory hotplug support
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>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/net/ehea/ehea.h b/drivers/net/ehea/ehea.h
index 5524271..82dd1a8 100644
--- a/drivers/net/ehea/ehea.h
+++ b/drivers/net/ehea/ehea.h
@@ -40,7 +40,7 @@
#include <asm/io.h>
#define DRV_NAME "ehea"
-#define DRV_VERSION "EHEA_0093"
+#define DRV_VERSION "EHEA_0094"
/* eHEA capability flags */
#define DLPAR_PORT_ADD_REM 1
diff --git a/drivers/net/ehea/ehea_main.c b/drivers/net/ehea/ehea_main.c
index b70c531..422fcb9 100644
--- a/drivers/net/ehea/ehea_main.c
+++ b/drivers/net/ehea/ehea_main.c
@@ -2863,7 +2863,7 @@
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 @@
}
}
- 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 +3512,21 @@
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");
+ /* Readd canceled memory block */
+ 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 --git a/drivers/net/ehea/ehea_qmr.c b/drivers/net/ehea/ehea_qmr.c
index db8a925..9b61dc9 100644
--- a/drivers/net/ehea/ehea_qmr.c
+++ b/drivers/net/ehea/ehea_qmr.c
@@ -567,7 +567,7 @@
static inline int ehea_init_top_bmap(struct ehea_top_bmap *ehea_top_bmap,
int dir)
{
- if(!ehea_top_bmap->dir[dir]) {
+ if (!ehea_top_bmap->dir[dir]) {
ehea_top_bmap->dir[dir] =
kzalloc(sizeof(struct ehea_dir_bmap), GFP_KERNEL);
if (!ehea_top_bmap->dir[dir])
@@ -578,7 +578,7 @@
static inline int ehea_init_bmap(struct ehea_bmap *ehea_bmap, int top, int dir)
{
- if(!ehea_bmap->top[top]) {
+ if (!ehea_bmap->top[top]) {
ehea_bmap->top[top] =
kzalloc(sizeof(struct ehea_top_bmap), GFP_KERNEL);
if (!ehea_bmap->top[top])
@@ -587,53 +587,124 @@
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 void ehea_rebuild_busmap(void)
{
- 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;
+ u64 vaddr = EHEA_BUSMAP_START;
+ int top, dir, idx;
- if (!ehea_bmap)
+ for (top = 0; top < EHEA_MAP_ENTRIES; top++) {
+ struct ehea_top_bmap *ehea_top;
+ int valid_dir_entries = 0;
+
+ if (!ehea_bmap->top[top])
+ continue;
+ ehea_top = ehea_bmap->top[top];
+ for (dir = 0; dir < EHEA_MAP_ENTRIES; dir++) {
+ struct ehea_dir_bmap *ehea_dir;
+ int valid_entries = 0;
+
+ if (!ehea_top->dir[dir])
+ continue;
+ valid_dir_entries++;
+ ehea_dir = ehea_top->dir[dir];
+ for (idx = 0; idx < EHEA_MAP_ENTRIES; idx++) {
+ if (!ehea_dir->ent[idx])
+ continue;
+ valid_entries++;
+ ehea_dir->ent[idx] = vaddr;
+ vaddr += EHEA_SECTSIZE;
+ }
+ if (!valid_entries) {
+ ehea_top->dir[dir] = NULL;
+ kfree(ehea_dir);
+ }
+ }
+ if (!valid_dir_entries) {
+ ehea_bmap->top[top] = NULL;
+ kfree(ehea_top);
+ }
+ }
+}
+
+static int ehea_update_busmap(unsigned long pfn, unsigned long pgnum, int add)
+{
+ unsigned long i, start_section, end_section;
+
+ if (!ehea_bmap) {
ehea_bmap = kzalloc(sizeof(struct ehea_bmap), GFP_KERNEL);
- if (!ehea_bmap)
- return -ENOMEM;
-
- for (i = start_section; i < end_section; i++) {
- int ret;
- int top, dir, idx;
- u64 vaddr;
-
- 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;
-
- ehea_bmap->top[top]->dir[dir]->ent[idx] = vaddr;
+ if (!ehea_bmap)
+ return -ENOMEM;
}
- mr_len += nr_pages * PAGE_SIZE;
- *(unsigned long *)arg = mr_len;
+ start_section = (pfn * PAGE_SIZE) / EHEA_SECTSIZE;
+ end_section = start_section + ((pgnum * PAGE_SIZE) / EHEA_SECTSIZE);
+ /* Mark entries as valid or invalid only; address is assigned later */
+ for (i = start_section; i < end_section; i++) {
+ u64 flag;
+ 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;
+
+ if (add) {
+ int ret = ehea_init_bmap(ehea_bmap, top, dir);
+ if (ret)
+ return ret;
+ flag = 1; /* valid */
+ ehea_mr_len += EHEA_SECTSIZE;
+ } else {
+ if (!ehea_bmap->top[top])
+ continue;
+ if (!ehea_bmap->top[top]->dir[dir])
+ continue;
+ flag = 0; /* invalid */
+ ehea_mr_len -= EHEA_SECTSIZE;
+ }
+ ehea_bmap->top[top]->dir[dir]->ent[idx] = flag;
+ }
+ ehea_rebuild_busmap(); /* Assign contiguous addresses for mr */
return 0;
}
-static unsigned long ehea_mr_len;
+int ehea_add_sect_bmap(unsigned long pfn, unsigned long nr_pages)
+{
+ int ret;
-static DEFINE_MUTEX(ehea_busmap_mutex);
+ mutex_lock(&ehea_busmap_mutex);
+ ret = ehea_update_busmap(pfn, nr_pages, EHEA_BUSMAP_ADD_SECT);
+ mutex_unlock(&ehea_busmap_mutex);
+ return ret;
+}
+
+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 --git a/drivers/net/ehea/ehea_qmr.h b/drivers/net/ehea/ehea_qmr.h
index 0bb6f92..1e58dc0 100644
--- a/drivers/net/ehea/ehea_qmr.h
+++ b/drivers/net/ehea/ehea_qmr.h
@@ -378,6 +378,8 @@
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);