Merge branch 'linus' into stackprotector

Conflicts:
	arch/x86/include/asm/pda.h
	kernel/fork.c

4 files changed, 180 insertions, 53 deletions

diff --git a/drivers/net/ehea/ehea.h b/drivers/net/ehea/ehea.h
index 5524271eedca..9930d5f8b9e1 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_0096"
 
 /* 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 b70c5314f537..a2f1905a23df 100644
--- a/drivers/net/ehea/ehea_main.c
+++ b/drivers/net/ehea/ehea_main.c
@@ -728,7 +728,6 @@ static int ehea_proc_rwqes(struct net_device *dev,
 			}
 
 			ehea_proc_skb(pr, cqe, skb);
-			dev->last_rx = jiffies;
 		} else {
 			pr->p_stats.poll_receive_errors++;
 			port_reset = ehea_treat_poll_error(pr, rq, cqe,
@@ -831,7 +830,7 @@ static int ehea_poll(struct napi_struct *napi, int budget)
 	while ((rx != budget) || force_irq) {
 		pr->poll_counter = 0;
 		force_irq = 0;
-		netif_rx_complete(dev, napi);
+		netif_rx_complete(napi);
 		ehea_reset_cq_ep(pr->recv_cq);
 		ehea_reset_cq_ep(pr->send_cq);
 		ehea_reset_cq_n1(pr->recv_cq);
@@ -842,7 +841,7 @@ static int ehea_poll(struct napi_struct *napi, int budget)
 		if (!cqe && !cqe_skb)
 			return rx;
 
-		if (!netif_rx_reschedule(dev, napi))
+		if (!netif_rx_reschedule(napi))
 			return rx;
 
 		cqe_skb = ehea_proc_cqes(pr, EHEA_POLL_MAX_CQES);
@@ -860,7 +859,7 @@ static void ehea_netpoll(struct net_device *dev)
 	int i;
 
 	for (i = 0; i < port->num_def_qps; i++)
-		netif_rx_schedule(dev, &port->port_res[i].napi);
+		netif_rx_schedule(&port->port_res[i].napi);
 }
 #endif
 
@@ -868,7 +867,7 @@ static irqreturn_t ehea_recv_irq_handler(int irq, void *param)
 {
 	struct ehea_port_res *pr = param;
 
-	netif_rx_schedule(pr->port->netdev, &pr->napi);
+	netif_rx_schedule(&pr->napi);
 
 	return IRQ_HANDLED;
 }
@@ -2863,7 +2862,7 @@ static void ehea_rereg_mrs(struct work_struct *work)
 	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 +2899,6 @@ static void ehea_rereg_mrs(struct work_struct *work)
 			}
 		}
 
-	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 +3511,21 @@ 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");
+		/* 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 db8a9257e680..225c692b5d99 100644
--- a/drivers/net/ehea/ehea_qmr.c
+++ b/drivers/net/ehea/ehea_qmr.c
@@ -182,7 +182,7 @@ struct ehea_cq *ehea_create_cq(struct ehea_adapter *adapter,
 				goto out_kill_hwq;
 			}
 		} else {
-			if ((hret != H_PAGE_REGISTERED) || (!vpage)) {
+			if (hret != H_PAGE_REGISTERED) {
 				ehea_error("CQ: registration of page failed "
 					   "hret=%lx\n", hret);
 				goto out_kill_hwq;
@@ -303,7 +303,7 @@ struct ehea_eq *ehea_create_eq(struct ehea_adapter *adapter,
 				goto out_kill_hwq;
 
 		} else {
-			if ((hret != H_PAGE_REGISTERED) || (!vpage))
+			if (hret != H_PAGE_REGISTERED)
 				goto out_kill_hwq;
 
 		}
@@ -567,7 +567,7 @@ static inline int ehea_calc_index(unsigned long i, unsigned long s)
 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_top_bmap(struct ehea_top_bmap *ehea_top_bmap,
 
 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 +587,171 @@ static inline int ehea_init_bmap(struct ehea_bmap *ehea_bmap, int top, int dir)
 	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)
-		ehea_bmap = kzalloc(sizeof(struct ehea_bmap), GFP_KERNEL);
-	if (!ehea_bmap)
-		return -ENOMEM;
+	for (top = 0; top < EHEA_MAP_ENTRIES; top++) {
+		struct ehea_top_bmap *ehea_top;
+		int valid_dir_entries = 0;
 
-	for (i = start_section; i < end_section; i++) {
-		int ret;
-		int top, dir, idx;
-		u64 vaddr;
+		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;
 
-		top = ehea_calc_index(i, EHEA_TOP_INDEX_SHIFT);
-		dir = ehea_calc_index(i, EHEA_DIR_INDEX_SHIFT);
+			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);
+		}
+	}
+}
 
-		ret = ehea_init_bmap(ehea_bmap, top, dir);
-		if(ret)
-			return ret;
+static int ehea_update_busmap(unsigned long pfn, unsigned long nr_pages, int add)
+{
+	unsigned long i, start_section, end_section;
 
-		idx = i & EHEA_INDEX_MASK;
-		vaddr = EHEA_BUSMAP_START + mr_len + i * EHEA_SECTSIZE;
+	if (!nr_pages)
+		return 0;
 
-		ehea_bmap->top[top]->dir[dir]->ent[idx] = vaddr;
+	if (!ehea_bmap) {
+		ehea_bmap = kzalloc(sizeof(struct ehea_bmap), GFP_KERNEL);
+		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 + ((nr_pages * 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_is_hugepage(unsigned long pfn)
+{
+	int page_order;
+
+	if (pfn & EHEA_HUGEPAGE_PFN_MASK)
+		return 0;
+
+	page_order = compound_order(pfn_to_page(pfn));
+	if (page_order + PAGE_SHIFT != EHEA_HUGEPAGESHIFT)
+		return 0;
+
+	return 1;
+}
+
+static int ehea_create_busmap_callback(unsigned long initial_pfn,
+				       unsigned long total_nr_pages, void *arg)
+{
+	int ret;
+	unsigned long pfn, start_pfn, end_pfn, nr_pages;
+
+	if ((total_nr_pages * PAGE_SIZE) < EHEA_HUGEPAGE_SIZE)
+		return ehea_update_busmap(initial_pfn, total_nr_pages,
+					  EHEA_BUSMAP_ADD_SECT);
+
+	/* Given chunk is >= 16GB -> check for hugepages */
+	start_pfn = initial_pfn;
+	end_pfn = initial_pfn + total_nr_pages;
+	pfn = start_pfn;
+
+	while (pfn < end_pfn) {
+		if (ehea_is_hugepage(pfn)) {
+			/* Add mem found in front of the hugepage */
+			nr_pages = pfn - start_pfn;
+			ret = ehea_update_busmap(start_pfn, nr_pages,
+						 EHEA_BUSMAP_ADD_SECT);
+			if (ret)
+				return ret;
+
+			/* Skip the hugepage */
+			pfn += (EHEA_HUGEPAGE_SIZE / PAGE_SIZE);
+			start_pfn = pfn;
+		} else
+			pfn += (EHEA_SECTSIZE / PAGE_SIZE);
+	}
+
+	/* Add mem found behind the hugepage(s)  */
+	nr_pages = pfn - start_pfn;
+	return ehea_update_busmap(start_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;
@@ -662,7 +780,7 @@ void ehea_destroy_busmap(void)
 
 	kfree(ehea_bmap);
 	ehea_bmap = NULL;
-out_destroy:	
+out_destroy:
 	mutex_unlock(&ehea_busmap_mutex);
 }
 
@@ -740,10 +858,10 @@ static u64 ehea_reg_mr_sections(int top, int dir, u64 *pt,
 	for (idx = 0; idx < EHEA_MAP_ENTRIES; idx++) {
 		if (!ehea_bmap->top[top]->dir[dir]->ent[idx])
 			continue;
-		
+
 		hret = ehea_reg_mr_section(top, dir, idx, pt, adapter, mr);
 		if ((hret != H_SUCCESS) && (hret != H_PAGE_REGISTERED))
-			    	return hret;
+			return hret;
 	}
 	return hret;
 }
@@ -761,7 +879,7 @@ static u64 ehea_reg_mr_dir_sections(int top, u64 *pt,
 
 		hret = ehea_reg_mr_sections(top, dir, pt, adapter, mr);
 		if ((hret != H_SUCCESS) && (hret != H_PAGE_REGISTERED))
-			    	return hret;
+			return hret;
 	}
 	return hret;
 }
@@ -775,7 +893,7 @@ int ehea_reg_kernel_mr(struct ehea_adapter *adapter, struct ehea_mr *mr)
 
 	unsigned long top;
 
-	pt = kzalloc(PAGE_SIZE, GFP_KERNEL);
+	pt = (void *)get_zeroed_page(GFP_KERNEL);
 	if (!pt) {
 		ehea_error("no mem");
 		ret = -ENOMEM;
@@ -819,7 +937,7 @@ int ehea_reg_kernel_mr(struct ehea_adapter *adapter, struct ehea_mr *mr)
 	mr->adapter = adapter;
 	ret = 0;
 out:
-	kfree(pt);
+	free_page((unsigned long)pt);
 	return ret;
 }
 
diff --git a/drivers/net/ehea/ehea_qmr.h b/drivers/net/ehea/ehea_qmr.h
index 0bb6f92fa2f8..0817c1e74a19 100644
--- a/drivers/net/ehea/ehea_qmr.h
+++ b/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
@@ -378,6 +381,8 @@ 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);