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-rw-r--r--drivers/base/core.c9
-rw-r--r--drivers/block/zram/Kconfig10
-rw-r--r--drivers/block/zram/zcomp.c7
-rw-r--r--drivers/block/zram/zcomp.h1
-rw-r--r--drivers/block/zram/zram_drv.c959
-rw-r--r--drivers/block/zram/zram_drv.h10
-rw-r--r--drivers/firmware/memmap.c24
-rw-r--r--drivers/md/md.c4
-rw-r--r--drivers/misc/altera-stapl/altera.c2
-rw-r--r--drivers/misc/kgdbts.c2
-rw-r--r--drivers/misc/spear13xx_pcie_gadget.c2
-rw-r--r--drivers/net/netconsole.c169
-rw-r--r--drivers/pci/host/pcie-spear13xx.c6
-rw-r--r--drivers/phy/phy-spear1310-miphy.c6
-rw-r--r--drivers/phy/phy-spear1340-miphy.c6
-rw-r--r--drivers/usb/misc/lvstest.c2
16 files changed, 736 insertions, 483 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 21d13038534e..dafae6d2f7ac 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -1303,12 +1303,11 @@ const char *device_get_devnode(struct device *dev,
return dev_name(dev);
/* replace '!' in the name with '/' */
- *tmp = kstrdup(dev_name(dev), GFP_KERNEL);
- if (!*tmp)
+ s = kstrdup(dev_name(dev), GFP_KERNEL);
+ if (!s)
return NULL;
- while ((s = strchr(*tmp, '!')))
- s[0] = '/';
- return *tmp;
+ strreplace(s, '!', '/');
+ return *tmp = s;
}
/**
diff --git a/drivers/block/zram/Kconfig b/drivers/block/zram/Kconfig
index 6489c0fd0ea6..386ba3d1a6ee 100644
--- a/drivers/block/zram/Kconfig
+++ b/drivers/block/zram/Kconfig
@@ -23,12 +23,4 @@ config ZRAM_LZ4_COMPRESS
default n
help
This option enables LZ4 compression algorithm support. Compression
- algorithm can be changed using `comp_algorithm' device attribute.
-
-config ZRAM_DEBUG
- bool "Compressed RAM block device debug support"
- depends on ZRAM
- default n
- help
- This option adds additional debugging code to the compressed
- RAM block device driver.
+ algorithm can be changed using `comp_algorithm' device attribute. \ No newline at end of file
diff --git a/drivers/block/zram/zcomp.c b/drivers/block/zram/zcomp.c
index f1ff39a3d1c1..965d1afb0eaa 100644
--- a/drivers/block/zram/zcomp.c
+++ b/drivers/block/zram/zcomp.c
@@ -274,7 +274,7 @@ ssize_t zcomp_available_show(const char *comp, char *buf)
int i = 0;
while (backends[i]) {
- if (sysfs_streq(comp, backends[i]->name))
+ if (!strcmp(comp, backends[i]->name))
sz += scnprintf(buf + sz, PAGE_SIZE - sz - 2,
"[%s] ", backends[i]->name);
else
@@ -286,6 +286,11 @@ ssize_t zcomp_available_show(const char *comp, char *buf)
return sz;
}
+bool zcomp_available_algorithm(const char *comp)
+{
+ return find_backend(comp) != NULL;
+}
+
bool zcomp_set_max_streams(struct zcomp *comp, int num_strm)
{
return comp->set_max_streams(comp, num_strm);
diff --git a/drivers/block/zram/zcomp.h b/drivers/block/zram/zcomp.h
index c59d1fca72c0..46e2b9f8f1f0 100644
--- a/drivers/block/zram/zcomp.h
+++ b/drivers/block/zram/zcomp.h
@@ -51,6 +51,7 @@ struct zcomp {
};
ssize_t zcomp_available_show(const char *comp, char *buf);
+bool zcomp_available_algorithm(const char *comp);
struct zcomp *zcomp_create(const char *comp, int max_strm);
void zcomp_destroy(struct zcomp *comp);
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 6e134f4759c0..fb655e8d1e3b 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -15,10 +15,6 @@
#define KMSG_COMPONENT "zram"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
-#ifdef CONFIG_ZRAM_DEBUG
-#define DEBUG
-#endif
-
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/bio.h>
@@ -32,12 +28,16 @@
#include <linux/string.h>
#include <linux/vmalloc.h>
#include <linux/err.h>
+#include <linux/idr.h>
+#include <linux/sysfs.h>
#include "zram_drv.h"
-/* Globals */
+static DEFINE_IDR(zram_index_idr);
+/* idr index must be protected */
+static DEFINE_MUTEX(zram_index_mutex);
+
static int zram_major;
-static struct zram *zram_devices;
static const char *default_compressor = "lzo";
/* Module params (documentation at end) */
@@ -53,7 +53,7 @@ static inline void deprecated_attr_warn(const char *name)
}
#define ZRAM_ATTR_RO(name) \
-static ssize_t name##_show(struct device *d, \
+static ssize_t name##_show(struct device *d, \
struct device_attribute *attr, char *b) \
{ \
struct zram *zram = dev_to_zram(d); \
@@ -74,33 +74,117 @@ static inline struct zram *dev_to_zram(struct device *dev)
return (struct zram *)dev_to_disk(dev)->private_data;
}
-static ssize_t compact_store(struct device *dev,
- struct device_attribute *attr, const char *buf, size_t len)
+/* flag operations require table entry bit_spin_lock() being held */
+static int zram_test_flag(struct zram_meta *meta, u32 index,
+ enum zram_pageflags flag)
{
- unsigned long nr_migrated;
- struct zram *zram = dev_to_zram(dev);
- struct zram_meta *meta;
+ return meta->table[index].value & BIT(flag);
+}
- down_read(&zram->init_lock);
- if (!init_done(zram)) {
- up_read(&zram->init_lock);
- return -EINVAL;
- }
+static void zram_set_flag(struct zram_meta *meta, u32 index,
+ enum zram_pageflags flag)
+{
+ meta->table[index].value |= BIT(flag);
+}
- meta = zram->meta;
- nr_migrated = zs_compact(meta->mem_pool);
- atomic64_add(nr_migrated, &zram->stats.num_migrated);
- up_read(&zram->init_lock);
+static void zram_clear_flag(struct zram_meta *meta, u32 index,
+ enum zram_pageflags flag)
+{
+ meta->table[index].value &= ~BIT(flag);
+}
- return len;
+static size_t zram_get_obj_size(struct zram_meta *meta, u32 index)
+{
+ return meta->table[index].value & (BIT(ZRAM_FLAG_SHIFT) - 1);
}
-static ssize_t disksize_show(struct device *dev,
- struct device_attribute *attr, char *buf)
+static void zram_set_obj_size(struct zram_meta *meta,
+ u32 index, size_t size)
{
- struct zram *zram = dev_to_zram(dev);
+ unsigned long flags = meta->table[index].value >> ZRAM_FLAG_SHIFT;
- return scnprintf(buf, PAGE_SIZE, "%llu\n", zram->disksize);
+ meta->table[index].value = (flags << ZRAM_FLAG_SHIFT) | size;
+}
+
+static inline int is_partial_io(struct bio_vec *bvec)
+{
+ return bvec->bv_len != PAGE_SIZE;
+}
+
+/*
+ * Check if request is within bounds and aligned on zram logical blocks.
+ */
+static inline int valid_io_request(struct zram *zram,
+ sector_t start, unsigned int size)
+{
+ u64 end, bound;
+
+ /* unaligned request */
+ if (unlikely(start & (ZRAM_SECTOR_PER_LOGICAL_BLOCK - 1)))
+ return 0;
+ if (unlikely(size & (ZRAM_LOGICAL_BLOCK_SIZE - 1)))
+ return 0;
+
+ end = start + (size >> SECTOR_SHIFT);
+ bound = zram->disksize >> SECTOR_SHIFT;
+ /* out of range range */
+ if (unlikely(start >= bound || end > bound || start > end))
+ return 0;
+
+ /* I/O request is valid */
+ return 1;
+}
+
+static void update_position(u32 *index, int *offset, struct bio_vec *bvec)
+{
+ if (*offset + bvec->bv_len >= PAGE_SIZE)
+ (*index)++;
+ *offset = (*offset + bvec->bv_len) % PAGE_SIZE;
+}
+
+static inline void update_used_max(struct zram *zram,
+ const unsigned long pages)
+{
+ unsigned long old_max, cur_max;
+
+ old_max = atomic_long_read(&zram->stats.max_used_pages);
+
+ do {
+ cur_max = old_max;
+ if (pages > cur_max)
+ old_max = atomic_long_cmpxchg(
+ &zram->stats.max_used_pages, cur_max, pages);
+ } while (old_max != cur_max);
+}
+
+static int page_zero_filled(void *ptr)
+{
+ unsigned int pos;
+ unsigned long *page;
+
+ page = (unsigned long *)ptr;
+
+ for (pos = 0; pos != PAGE_SIZE / sizeof(*page); pos++) {
+ if (page[pos])
+ return 0;
+ }
+
+ return 1;
+}
+
+static void handle_zero_page(struct bio_vec *bvec)
+{
+ struct page *page = bvec->bv_page;
+ void *user_mem;
+
+ user_mem = kmap_atomic(page);
+ if (is_partial_io(bvec))
+ memset(user_mem + bvec->bv_offset, 0, bvec->bv_len);
+ else
+ clear_page(user_mem);
+ kunmap_atomic(user_mem);
+
+ flush_dcache_page(page);
}
static ssize_t initstate_show(struct device *dev,
@@ -116,6 +200,14 @@ static ssize_t initstate_show(struct device *dev,
return scnprintf(buf, PAGE_SIZE, "%u\n", val);
}
+static ssize_t disksize_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct zram *zram = dev_to_zram(dev);
+
+ return scnprintf(buf, PAGE_SIZE, "%llu\n", zram->disksize);
+}
+
static ssize_t orig_data_size_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -143,19 +235,6 @@ static ssize_t mem_used_total_show(struct device *dev,
return scnprintf(buf, PAGE_SIZE, "%llu\n", val << PAGE_SHIFT);
}
-static ssize_t max_comp_streams_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- int val;
- struct zram *zram = dev_to_zram(dev);
-
- down_read(&zram->init_lock);
- val = zram->max_comp_streams;
- up_read(&zram->init_lock);
-
- return scnprintf(buf, PAGE_SIZE, "%d\n", val);
-}
-
static ssize_t mem_limit_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -225,6 +304,19 @@ static ssize_t mem_used_max_store(struct device *dev,
return len;
}
+static ssize_t max_comp_streams_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int val;
+ struct zram *zram = dev_to_zram(dev);
+
+ down_read(&zram->init_lock);
+ val = zram->max_comp_streams;
+ up_read(&zram->init_lock);
+
+ return scnprintf(buf, PAGE_SIZE, "%d\n", val);
+}
+
static ssize_t max_comp_streams_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
@@ -271,6 +363,8 @@ static ssize_t comp_algorithm_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
struct zram *zram = dev_to_zram(dev);
+ size_t sz;
+
down_write(&zram->init_lock);
if (init_done(zram)) {
up_write(&zram->init_lock);
@@ -278,69 +372,108 @@ static ssize_t comp_algorithm_store(struct device *dev,
return -EBUSY;
}
strlcpy(zram->compressor, buf, sizeof(zram->compressor));
+
+ /* ignore trailing newline */
+ sz = strlen(zram->compressor);
+ if (sz > 0 && zram->compressor[sz - 1] == '\n')
+ zram->compressor[sz - 1] = 0x00;
+
+ if (!zcomp_available_algorithm(zram->compressor))
+ len = -EINVAL;
+
up_write(&zram->init_lock);
return len;
}
-/* flag operations needs meta->tb_lock */
-static int zram_test_flag(struct zram_meta *meta, u32 index,
- enum zram_pageflags flag)
+static ssize_t compact_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t len)
{
- return meta->table[index].value & BIT(flag);
-}
+ unsigned long nr_migrated;
+ struct zram *zram = dev_to_zram(dev);
+ struct zram_meta *meta;
-static void zram_set_flag(struct zram_meta *meta, u32 index,
- enum zram_pageflags flag)
-{
- meta->table[index].value |= BIT(flag);
-}
+ down_read(&zram->init_lock);
+ if (!init_done(zram)) {
+ up_read(&zram->init_lock);
+ return -EINVAL;
+ }
-static void zram_clear_flag(struct zram_meta *meta, u32 index,
- enum zram_pageflags flag)
-{
- meta->table[index].value &= ~BIT(flag);
+ meta = zram->meta;
+ nr_migrated = zs_compact(meta->mem_pool);
+ atomic64_add(nr_migrated, &zram->stats.num_migrated);
+ up_read(&zram->init_lock);
+
+ return len;
}
-static size_t zram_get_obj_size(struct zram_meta *meta, u32 index)
+static ssize_t io_stat_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
{
- return meta->table[index].value & (BIT(ZRAM_FLAG_SHIFT) - 1);
+ struct zram *zram = dev_to_zram(dev);
+ ssize_t ret;
+
+ down_read(&zram->init_lock);
+ ret = scnprintf(buf, PAGE_SIZE,
+ "%8llu %8llu %8llu %8llu\n",
+ (u64)atomic64_read(&zram->stats.failed_reads),
+ (u64)atomic64_read(&zram->stats.failed_writes),
+ (u64)atomic64_read(&zram->stats.invalid_io),
+ (u64)atomic64_read(&zram->stats.notify_free));
+ up_read(&zram->init_lock);
+
+ return ret;
}
-static void zram_set_obj_size(struct zram_meta *meta,
- u32 index, size_t size)
+static ssize_t mm_stat_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
{
- unsigned long flags = meta->table[index].value >> ZRAM_FLAG_SHIFT;
+ struct zram *zram = dev_to_zram(dev);
+ u64 orig_size, mem_used = 0;
+ long max_used;
+ ssize_t ret;
- meta->table[index].value = (flags << ZRAM_FLAG_SHIFT) | size;
+ down_read(&zram->init_lock);
+ if (init_done(zram))
+ mem_used = zs_get_total_pages(zram->meta->mem_pool);
+
+ orig_size = atomic64_read(&zram->stats.pages_stored);
+ max_used = atomic_long_read(&zram->stats.max_used_pages);
+
+ ret = scnprintf(buf, PAGE_SIZE,
+ "%8llu %8llu %8llu %8lu %8ld %8llu %8llu\n",
+ orig_size << PAGE_SHIFT,
+ (u64)atomic64_read(&zram->stats.compr_data_size),
+ mem_used << PAGE_SHIFT,
+ zram->limit_pages << PAGE_SHIFT,
+ max_used << PAGE_SHIFT,
+ (u64)atomic64_read(&zram->stats.zero_pages),
+ (u64)atomic64_read(&zram->stats.num_migrated));
+ up_read(&zram->init_lock);
+
+ return ret;
}
-static inline int is_partial_io(struct bio_vec *bvec)
+static DEVICE_ATTR_RO(io_stat);
+static DEVICE_ATTR_RO(mm_stat);
+ZRAM_ATTR_RO(num_reads);
+ZRAM_ATTR_RO(num_writes);
+ZRAM_ATTR_RO(failed_reads);
+ZRAM_ATTR_RO(failed_writes);
+ZRAM_ATTR_RO(invalid_io);
+ZRAM_ATTR_RO(notify_free);
+ZRAM_ATTR_RO(zero_pages);
+ZRAM_ATTR_RO(compr_data_size);
+
+static inline bool zram_meta_get(struct zram *zram)
{
- return bvec->bv_len != PAGE_SIZE;
+ if (atomic_inc_not_zero(&zram->refcount))
+ return true;
+ return false;
}
-/*
- * Check if request is within bounds and aligned on zram logical blocks.
- */
-static inline int valid_io_request(struct zram *zram,
- sector_t start, unsigned int size)
+static inline void zram_meta_put(struct zram *zram)
{
- u64 end, bound;
-
- /* unaligned request */
- if (unlikely(start & (ZRAM_SECTOR_PER_LOGICAL_BLOCK - 1)))
- return 0;
- if (unlikely(size & (ZRAM_LOGICAL_BLOCK_SIZE - 1)))
- return 0;
-
- end = start + (size >> SECTOR_SHIFT);
- bound = zram->disksize >> SECTOR_SHIFT;
- /* out of range range */
- if (unlikely(start >= bound || end > bound || start > end))
- return 0;
-
- /* I/O request is valid */
- return 1;
+ atomic_dec(&zram->refcount);
}
static void zram_meta_free(struct zram_meta *meta, u64 disksize)
@@ -394,56 +527,6 @@ out_error:
return NULL;
}
-static inline bool zram_meta_get(struct zram *zram)
-{
- if (atomic_inc_not_zero(&zram->refcount))
- return true;
- return false;
-}
-
-static inline void zram_meta_put(struct zram *zram)
-{
- atomic_dec(&zram->refcount);
-}
-
-static void update_position(u32 *index, int *offset, struct bio_vec *bvec)
-{
- if (*offset + bvec->bv_len >= PAGE_SIZE)
- (*index)++;
- *offset = (*offset + bvec->bv_len) % PAGE_SIZE;
-}
-
-static int page_zero_filled(void *ptr)
-{
- unsigned int pos;
- unsigned long *page;
-
- page = (unsigned long *)ptr;
-
- for (pos = 0; pos != PAGE_SIZE / sizeof(*page); pos++) {
- if (page[pos])
- return 0;
- }
-
- return 1;
-}
-
-static void handle_zero_page(struct bio_vec *bvec)
-{
- struct page *page = bvec->bv_page;
- void *user_mem;
-
- user_mem = kmap_atomic(page);
- if (is_partial_io(bvec))
- memset(user_mem + bvec->bv_offset, 0, bvec->bv_len);
- else
- clear_page(user_mem);
- kunmap_atomic(user_mem);
-
- flush_dcache_page(page);
-}
-
-
/*
* To protect concurrent access to the same index entry,
* caller should hold this table index entry's bit_spinlock to
@@ -561,21 +644,6 @@ out_cleanup:
return ret;
}
-static inline void update_used_max(struct zram *zram,
- const unsigned long pages)
-{
- unsigned long old_max, cur_max;
-
- old_max = atomic_long_read(&zram->stats.max_used_pages);
-
- do {
- cur_max = old_max;
- if (pages > cur_max)
- old_max = atomic_long_cmpxchg(
- &zram->stats.max_used_pages, cur_max, pages);
- } while (old_max != cur_max);
-}
-
static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index,
int offset)
{
@@ -585,8 +653,7 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index,
struct page *page;
unsigned char *user_mem, *cmem, *src, *uncmem = NULL;
struct zram_meta *meta = zram->meta;
- struct zcomp_strm *zstrm;
- bool locked = false;
+ struct zcomp_strm *zstrm = NULL;
unsigned long alloced_pages;
page = bvec->bv_page;
@@ -606,7 +673,6 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index,
}
zstrm = zcomp_strm_find(zram->comp);
- locked = true;
user_mem = kmap_atomic(page);
if (is_partial_io(bvec)) {
@@ -678,7 +744,7 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index,
}
zcomp_strm_release(zram->comp, zstrm);
- locked = false;
+ zstrm = NULL;
zs_unmap_object(meta->mem_pool, handle);
/*
@@ -696,42 +762,13 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index,
atomic64_add(clen, &zram->stats.compr_data_size);
atomic64_inc(&zram->stats.pages_stored);
out:
- if (locked)
+ if (zstrm)
zcomp_strm_release(zram->comp, zstrm);
if (is_partial_io(bvec))
kfree(uncmem);
return ret;
}
-static int zram_bvec_rw(struct zram *zram, struct bio_vec *bvec, u32 index,
- int offset, int rw)
-{
- unsigned long start_time = jiffies;
- int ret;
-
- generic_start_io_acct(rw, bvec->bv_len >> SECTOR_SHIFT,
- &zram->disk->part0);
-
- if (rw == READ) {
- atomic64_inc(&zram->stats.num_reads);
- ret = zram_bvec_read(zram, bvec, index, offset);
- } else {
- atomic64_inc(&zram->stats.num_writes);
- ret = zram_bvec_write(zram, bvec, index, offset);
- }
-
- generic_end_io_acct(rw, &zram->disk->part0, start_time);
-
- if (unlikely(ret)) {
- if (rw == READ)
- atomic64_inc(&zram->stats.failed_reads);
- else
- atomic64_inc(&zram->stats.failed_writes);
- }
-
- return ret;
-}
-
/*
* zram_bio_discard - handler on discard request
* @index: physical block index in PAGE_SIZE units
@@ -771,151 +808,32 @@ static void zram_bio_discard(struct zram *zram, u32 index,
}
}
-static void zram_reset_device(struct zram *zram)
-{
- struct zram_meta *meta;
- struct zcomp *comp;
- u64 disksize;
-
- down_write(&zram->init_lock);
-
- zram->limit_pages = 0;
-
- if (!init_done(zram)) {
- up_write(&zram->init_lock);
- return;
- }
-
- meta = zram->meta;
- comp = zram->comp;
- disksize = zram->disksize;
- /*
- * Refcount will go down to 0 eventually and r/w handler
- * cannot handle further I/O so it will bail out by
- * check zram_meta_get.
- */
- zram_meta_put(zram);
- /*
- * We want to free zram_meta in process context to avoid
- * deadlock between reclaim path and any other locks.
- */
- wait_event(zram->io_done, atomic_read(&zram->refcount) == 0);
-
- /* Reset stats */
- memset(&zram->stats, 0, sizeof(zram->stats));
- zram->disksize = 0;
- zram->max_comp_streams = 1;
-
- set_capacity(zram->disk, 0);
- part_stat_set_all(&zram->disk->part0, 0);
-
- up_write(&zram->init_lock);
- /* I/O operation under all of CPU are done so let's free */
- zram_meta_free(meta, disksize);
- zcomp_destroy(comp);
-}
-
-static ssize_t disksize_store(struct device *dev,
- struct device_attribute *attr, const char *buf, size_t len)
-{
- u64 disksize;
- struct zcomp *comp;
- struct zram_meta *meta;
- struct zram *zram = dev_to_zram(dev);
- int err;
-
- disksize = memparse(buf, NULL);
- if (!disksize)
- return -EINVAL;
-
- disksize = PAGE_ALIGN(disksize);
- meta = zram_meta_alloc(zram->disk->first_minor, disksize);
- if (!meta)
- return -ENOMEM;
-
- comp = zcomp_create(zram->compressor, zram->max_comp_streams);
- if (IS_ERR(comp)) {
- pr_info("Cannot initialise %s compressing backend\n",
- zram->compressor);
- err = PTR_ERR(comp);
- goto out_free_meta;
- }
-
- down_write(&zram->init_lock);
- if (init_done(zram)) {
- pr_info("Cannot change disksize for initialized device\n");
- err = -EBUSY;
- goto out_destroy_comp;
- }
-
- init_waitqueue_head(&zram->io_done);
- atomic_set(&zram->refcount, 1);
- zram->meta = meta;
- zram->comp = comp;
- zram->disksize = disksize;
- set_capacity(zram->disk, zram->disksize >> SECTOR_SHIFT);
- up_write(&zram->init_lock);
-
- /*
- * Revalidate disk out of the init_lock to avoid lockdep splat.
- * It's okay because disk's capacity is protected by init_lock
- * so that revalidate_disk always sees up-to-date capacity.
- */
- revalidate_disk(zram->disk);
-
- return len;
-
-out_destroy_comp:
- up_write(&zram->init_lock);
- zcomp_destroy(comp);
-out_free_meta:
- zram_meta_free(meta, disksize);
- return err;
-}
-
-static ssize_t reset_store(struct device *dev,
- struct device_attribute *attr, const char *buf, size_t len)
+static int zram_bvec_rw(struct zram *zram, struct bio_vec *bvec, u32 index,
+ int offset, int rw)
{
+ unsigned long start_time = jiffies;
int ret;
- unsigned short do_reset;
- struct zram *zram;
- struct block_device *bdev;
- zram = dev_to_zram(dev);
- bdev = bdget_disk(zram->disk, 0);
-
- if (!bdev)
- return -ENOMEM;
+ generic_start_io_acct(rw, bvec->bv_len >> SECTOR_SHIFT,
+ &zram->disk->part0);
- mutex_lock(&bdev->bd_mutex);
- /* Do not reset an active device! */
- if (bdev->bd_openers) {
- ret = -EBUSY;
- goto out;
+ if (rw == READ) {
+ atomic64_inc(&zram->stats.num_reads);
+ ret = zram_bvec_read(zram, bvec, index, offset);
+ } else {
+ atomic64_inc(&zram->stats.num_writes);
+ ret = zram_bvec_write(zram, bvec, index, offset);
}
- ret = kstrtou16(buf, 10, &do_reset);
- if (ret)
- goto out;
+ generic_end_io_acct(rw, &zram->disk->part0, start_time);
- if (!do_reset) {
- ret = -EINVAL;
- goto out;
+ if (unlikely(ret)) {
+ if (rw == READ)
+ atomic64_inc(&zram->stats.failed_reads);
+ else
+ atomic64_inc(&zram->stats.failed_writes);
}
- /* Make sure all pending I/O is finished */
- fsync_bdev(bdev);
- zram_reset_device(zram);
-
- mutex_unlock(&bdev->bd_mutex);
- revalidate_disk(zram->disk);
- bdput(bdev);
-
- return len;
-
-out:
- mutex_unlock(&bdev->bd_mutex);
- bdput(bdev);
return ret;
}
@@ -1055,80 +973,185 @@ out:
return err;
}
-static const struct block_device_operations zram_devops = {
- .swap_slot_free_notify = zram_slot_free_notify,
- .rw_page = zram_rw_page,
- .owner = THIS_MODULE
-};
+static void zram_reset_device(struct zram *zram)
+{
+ struct zram_meta *meta;
+ struct zcomp *comp;
+ u64 disksize;
-static DEVICE_ATTR_WO(compact);
-static DEVICE_ATTR_RW(disksize);
-static DEVICE_ATTR_RO(initstate);
-static DEVICE_ATTR_WO(reset);
-static DEVICE_ATTR_RO(orig_data_size);
-static DEVICE_ATTR_RO(mem_used_total);
-static DEVICE_ATTR_RW(mem_limit);
-static DEVICE_ATTR_RW(mem_used_max);
-static DEVICE_ATTR_RW(max_comp_streams);
-static DEVICE_ATTR_RW(comp_algorithm);
+ down_write(&zram->init_lock);
-static ssize_t io_stat_show(struct device *dev,
- struct device_attribute *attr, char *buf)
+ zram->limit_pages = 0;
+
+ if (!init_done(zram)) {
+ up_write(&zram->init_lock);
+ return;
+ }
+
+ meta = zram->meta;
+ comp = zram->comp;
+ disksize = zram->disksize;
+ /*
+ * Refcount will go down to 0 eventually and r/w handler
+ * cannot handle further I/O so it will bail out by
+ * check zram_meta_get.
+ */
+ zram_meta_put(zram);
+ /*
+ * We want to free zram_meta in process context to avoid
+ * deadlock between reclaim path and any other locks.
+ */
+ wait_event(zram->io_done, atomic_read(&zram->refcount) == 0);
+
+ /* Reset stats */
+ memset(&zram->stats, 0, sizeof(zram->stats));
+ zram->disksize = 0;
+ zram->max_comp_streams = 1;
+
+ set_capacity(zram->disk, 0);
+ part_stat_set_all(&zram->disk->part0, 0);
+
+ up_write(&zram->init_lock);
+ /* I/O operation under all of CPU are done so let's free */
+ zram_meta_free(meta, disksize);
+ zcomp_destroy(comp);
+}
+
+static ssize_t disksize_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t len)
{
+ u64 disksize;
+ struct zcomp *comp;
+ struct zram_meta *meta;
struct zram *zram = dev_to_zram(dev);
- ssize_t ret;
+ int err;
- down_read(&zram->init_lock);
- ret = scnprintf(buf, PAGE_SIZE,
- "%8llu %8llu %8llu %8llu\n",
- (u64)atomic64_read(&zram->stats.failed_reads),
- (u64)atomic64_read(&zram->stats.failed_writes),
- (u64)atomic64_read(&zram->stats.invalid_io),
- (u64)atomic64_read(&zram->stats.notify_free));
- up_read(&zram->init_lock);
+ disksize = memparse(buf, NULL);
+ if (!disksize)
+ return -EINVAL;
- return ret;
+ disksize = PAGE_ALIGN(disksize);
+ meta = zram_meta_alloc(zram->disk->first_minor, disksize);
+ if (!meta)
+ return -ENOMEM;
+
+ comp = zcomp_create(zram->compressor, zram->max_comp_streams);
+ if (IS_ERR(comp)) {
+ pr_info("Cannot initialise %s compressing backend\n",
+ zram->compressor);
+ err = PTR_ERR(comp);
+ goto out_free_meta;
+ }
+
+ down_write(&zram->init_lock);
+ if (init_done(zram)) {
+ pr_info("Cannot change disksize for initialized device\n");
+ err = -EBUSY;
+ goto out_destroy_comp;
+ }
+
+ init_waitqueue_head(&zram->io_done);
+ atomic_set(&zram->refcount, 1);
+ zram->meta = meta;
+ zram->comp = comp;
+ zram->disksize = disksize;
+ set_capacity(zram->disk, zram->disksize >> SECTOR_SHIFT);
+ up_write(&zram->init_lock);
+
+ /*
+ * Revalidate disk out of the init_lock to avoid lockdep splat.
+ * It's okay because disk's capacity is protected by init_lock
+ * so that revalidate_disk always sees up-to-date capacity.
+ */
+ revalidate_disk(zram->disk);
+
+ return len;
+
+out_destroy_comp:
+ up_write(&zram->init_lock);
+ zcomp_destroy(comp);
+out_free_meta:
+ zram_meta_free(meta, disksize);
+ return err;
}
-static ssize_t mm_stat_show(struct device *dev,
- struct device_attribute *attr, char *buf)
+static ssize_t reset_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t len)
{
- struct zram *zram = dev_to_zram(dev);
- u64 orig_size, mem_used = 0;
- long max_used;
- ssize_t ret;
+ int ret;
+ unsigned short do_reset;
+ struct zram *zram;
+ struct block_device *bdev;
- down_read(&zram->init_lock);
- if (init_done(zram))
- mem_used = zs_get_total_pages(zram->meta->mem_pool);
+ ret = kstrtou16(buf, 10, &do_reset);
+ if (ret)
+ return ret;
- orig_size = atomic64_read(&zram->stats.pages_stored);
- max_used = atomic_long_read(&zram->stats.max_used_pages);
+ if (!do_reset)
+ return -EINVAL;
- ret = scnprintf(buf, PAGE_SIZE,
- "%8llu %8llu %8llu %8lu %8ld %8llu %8llu\n",
- orig_size << PAGE_SHIFT,
- (u64)atomic64_read(&zram->stats.compr_data_size),
- mem_used << PAGE_SHIFT,
- zram->limit_pages << PAGE_SHIFT,
- max_used << PAGE_SHIFT,
- (u64)atomic64_read(&zram->stats.zero_pages),
- (u64)atomic64_read(&zram->stats.num_migrated));
- up_read(&zram->init_lock);
+ zram = dev_to_zram(dev);
+ bdev = bdget_disk(zram->disk, 0);
+ if (!bdev)
+ return -ENOMEM;
+
+ mutex_lock(&bdev->bd_mutex);
+ /* Do not reset an active device or claimed device */
+ if (bdev->bd_openers || zram->claim) {
+ mutex_unlock(&bdev->bd_mutex);
+ bdput(bdev);
+ return -EBUSY;
+ }
+
+ /* From now on, anyone can't open /dev/zram[0-9] */
+ zram->claim = true;
+ mutex_unlock(&bdev->bd_mutex);
+
+ /* Make sure all the pending I/O are finished */
+ fsync_bdev(bdev);
+ zram_reset_device(zram);
+ revalidate_disk(zram->disk);
+ bdput(bdev);
+
+ mutex_lock(&bdev->bd_mutex);
+ zram->claim = false;
+ mutex_unlock(&bdev->bd_mutex);
+
+ return len;
+}
+
+static int zram_open(struct block_device *bdev, fmode_t mode)
+{
+ int ret = 0;
+ struct zram *zram;
+
+ WARN_ON(!mutex_is_locked(&bdev->bd_mutex));
+
+ zram = bdev->bd_disk->private_data;
+ /* zram was claimed to reset so open request fails */
+ if (zram->claim)
+ ret = -EBUSY;
return ret;
}
-static DEVICE_ATTR_RO(io_stat);
-static DEVICE_ATTR_RO(mm_stat);
-ZRAM_ATTR_RO(num_reads);
-ZRAM_ATTR_RO(num_writes);
-ZRAM_ATTR_RO(failed_reads);
-ZRAM_ATTR_RO(failed_writes);
-ZRAM_ATTR_RO(invalid_io);
-ZRAM_ATTR_RO(notify_free);
-ZRAM_ATTR_RO(zero_pages);
-ZRAM_ATTR_RO(compr_data_size);
+static const struct block_device_operations zram_devops = {
+ .open = zram_open,
+ .swap_slot_free_notify = zram_slot_free_notify,
+ .rw_page = zram_rw_page,
+ .owner = THIS_MODULE
+};
+
+static DEVICE_ATTR_WO(compact);
+static DEVICE_ATTR_RW(disksize);
+static DEVICE_ATTR_RO(initstate);
+static DEVICE_ATTR_WO(reset);
+static DEVICE_ATTR_RO(orig_data_size);
+static DEVICE_ATTR_RO(mem_used_total);
+static DEVICE_ATTR_RW(mem_limit);
+static DEVICE_ATTR_RW(mem_used_max);
+static DEVICE_ATTR_RW(max_comp_streams);
+static DEVICE_ATTR_RW(comp_algorithm);
static struct attribute *zram_disk_attrs[] = {
&dev_attr_disksize.attr,
@@ -1158,10 +1181,24 @@ static struct attribute_group zram_disk_attr_group = {
.attrs = zram_disk_attrs,
};
-static int create_device(struct zram *zram, int device_id)
+/*
+ * Allocate and initialize new zram device. the function returns
+ * '>= 0' device_id upon success, and negative value otherwise.
+ */
+static int zram_add(void)
{
+ struct zram *zram;
struct request_queue *queue;
- int ret = -ENOMEM;
+ int ret, device_id;
+
+ zram = kzalloc(sizeof(struct zram), GFP_KERNEL);
+ if (!zram)
+ return -ENOMEM;
+
+ ret = idr_alloc(&zram_index_idr, zram, 0, 0, GFP_KERNEL);
+ if (ret < 0)
+ goto out_free_dev;
+ device_id = ret;
init_rwsem(&zram->init_lock);
@@ -1169,12 +1206,13 @@ static int create_device(struct zram *zram, int device_id)
if (!queue) {
pr_err("Error allocating disk queue for device %d\n",
device_id);
- goto out;
+ ret = -ENOMEM;
+ goto out_free_idr;
}
blk_queue_make_request(queue, zram_make_request);
- /* gendisk structure */
+ /* gendisk structure */
zram->disk = alloc_disk(1);
if (!zram->disk) {
pr_warn("Error allocating disk structure for device %d\n",
@@ -1232,90 +1270,177 @@ static int create_device(struct zram *zram, int device_id)
strlcpy(zram->compressor, default_compressor, sizeof(zram->compressor));
zram->meta = NULL;
zram->max_comp_streams = 1;
- return 0;
+
+ pr_info("Added device: %s\n", zram->disk->disk_name);
+ return device_id;
out_free_disk:
del_gendisk(zram->disk);
put_disk(zram->disk);
out_free_queue:
blk_cleanup_queue(queue);
-out:
+out_free_idr:
+ idr_remove(&zram_index_idr, device_id);
+out_free_dev:
+ kfree(zram);
return ret;
}
-static void destroy_devices(unsigned int nr)
+static int zram_remove(struct zram *zram)
+{
+ struct block_device *bdev;
+
+ bdev = bdget_disk(zram->disk, 0);
+ if (!bdev)
+ return -ENOMEM;
+
+ mutex_lock(&bdev->bd_mutex);
+ if (bdev->bd_openers || zram->claim) {
+ mutex_unlock(&bdev->bd_mutex);
+ bdput(bdev);
+ return -EBUSY;
+ }
+
+ zram->claim = true;
+ mutex_unlock(&bdev->bd_mutex);
+
+ /*
+ * Remove sysfs first, so no one will perform a disksize
+ * store while we destroy the devices. This also helps during
+ * hot_remove -- zram_reset_device() is the last holder of
+ * ->init_lock, no later/concurrent disksize_store() or any
+ * other sysfs handlers are possible.
+ */
+ sysfs_remove_group(&disk_to_dev(zram->disk)->kobj,
+ &zram_disk_attr_group);
+
+ /* Make sure all the pending I/O are finished */
+ fsync_bdev(bdev);
+ zram_reset_device(zram);
+ bdput(bdev);
+
+ pr_info("Removed device: %s\n", zram->disk->disk_name);
+
+ idr_remove(&zram_index_idr, zram->disk->first_minor);
+ blk_cleanup_queue(zram->disk->queue);
+ del_gendisk(zram->disk);
+ put_disk(zram->disk);
+ kfree(zram);
+ return 0;
+}
+
+/* zram-control sysfs attributes */
+static ssize_t hot_add_show(struct class *class,
+ struct class_attribute *attr,
+ char *buf)
+{
+ int ret;
+
+ mutex_lock(&zram_index_mutex);
+ ret = zram_add();
+ mutex_unlock(&zram_index_mutex);
+
+ if (ret < 0)
+ return ret;
+ return scnprintf(buf, PAGE_SIZE, "%d\n", ret);
+}
+
+static ssize_t hot_remove_store(struct class *class,
+ struct class_attribute *attr,
+ const char *buf,
+ size_t count)
{
struct zram *zram;
- unsigned int i;
+ int ret, dev_id;
- for (i = 0; i < nr; i++) {
- zram = &zram_devices[i];
- /*
- * Remove sysfs first, so no one will perform a disksize
- * store while we destroy the devices
- */
- sysfs_remove_group(&disk_to_dev(zram->disk)->kobj,
- &zram_disk_attr_group);
+ /* dev_id is gendisk->first_minor, which is `int' */
+ ret = kstrtoint(buf, 10, &dev_id);
+ if (ret)
+ return ret;
+ if (dev_id < 0)
+ return -EINVAL;
- zram_reset_device(zram);
+ mutex_lock(&zram_index_mutex);
- blk_cleanup_queue(zram->disk->queue);
- del_gendisk(zram->disk);
- put_disk(zram->disk);
- }
+ zram = idr_find(&zram_index_idr, dev_id);
+ if (zram)
+ ret = zram_remove(zram);
+ else
+ ret = -ENODEV;
- kfree(zram_devices);
+ mutex_unlock(&zram_index_mutex);
+ return ret ? ret : count;
+}
+
+static struct class_attribute zram_control_class_attrs[] = {
+ __ATTR_RO(hot_add),
+ __ATTR_WO(hot_remove),
+ __ATTR_NULL,
+};
+
+static struct class zram_control_class = {
+ .name = "zram-control",
+ .owner = THIS_MODULE,
+ .class_attrs = zram_control_class_attrs,
+};
+
+static int zram_remove_cb(int id, void *ptr, void *data)
+{
+ zram_remove(ptr);
+ return 0;
+}
+
+static void destroy_devices(void)
+{
+ class_unregister(&zram_control_class);
+ idr_for_each(&zram_index_idr, &zram_remove_cb, NULL);
+ idr_destroy(&zram_index_idr);
unregister_blkdev(zram_major, "zram");
- pr_info("Destroyed %u device(s)\n", nr);
}
static int __init zram_init(void)
{
- int ret, dev_id;
+ int ret;
- if (num_devices > max_num_devices) {
- pr_warn("Invalid value for num_devices: %u\n",
- num_devices);
- return -EINVAL;
+ ret = class_register(&zram_control_class);
+ if (ret) {
+ pr_warn("Unable to register zram-control class\n");
+ return ret;
}
zram_major = register_blkdev(0, "zram");
if (zram_major <= 0) {
pr_warn("Unable to get major number\n");
+ class_unregister(&zram_control_class);
return -EBUSY;
}
- /* Allocate the device array and initialize each one */
- zram_devices = kzalloc(num_devices * sizeof(struct zram), GFP_KERNEL);
- if (!zram_devices) {
- unregister_blkdev(zram_major, "zram");
- return -ENOMEM;
- }
-
- for (dev_id = 0; dev_id < num_devices; dev_id++) {
- ret = create_device(&zram_devices[dev_id], dev_id);
- if (ret)
+ while (num_devices != 0) {
+ mutex_lock(&zram_index_mutex);
+ ret = zram_add();
+ mutex_unlock(&zram_index_mutex);
+ if (ret < 0)
goto out_error;
+ num_devices--;
}
- pr_info("Created %u device(s)\n", num_devices);
return 0;
out_error:
- destroy_devices(dev_id);
+ destroy_devices();
return ret;
}
static void __exit zram_exit(void)
{
- destroy_devices(num_devices);
+ destroy_devices();
}
module_init(zram_init);
module_exit(zram_exit);
module_param(num_devices, uint, 0);
-MODULE_PARM_DESC(num_devices, "Number of zram devices");
+MODULE_PARM_DESC(num_devices, "Number of pre-created zram devices");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("Nitin Gupta <ngupta@vflare.org>");
diff --git a/drivers/block/zram/zram_drv.h b/drivers/block/zram/zram_drv.h
index 570c598f4ce9..6dbe2df506bf 100644
--- a/drivers/block/zram/zram_drv.h
+++ b/drivers/block/zram/zram_drv.h
@@ -20,12 +20,6 @@
#include "zcomp.h"
-/*
- * Some arbitrary value. This is just to catch
- * invalid value for num_devices module parameter.
- */
-static const unsigned max_num_devices = 32;
-
/*-- Configurable parameters */
/*
@@ -121,5 +115,9 @@ struct zram {
*/
u64 disksize; /* bytes */
char compressor[10];
+ /*
+ * zram is claimed so open request will be failed
+ */
+ bool claim; /* Protected by bdev->bd_mutex */
};
#endif
diff --git a/drivers/firmware/memmap.c b/drivers/firmware/memmap.c
index cc016c615c19..5de3ed29282c 100644
--- a/drivers/firmware/memmap.c
+++ b/drivers/firmware/memmap.c
@@ -144,7 +144,9 @@ static struct kobj_type __refdata memmap_ktype = {
*
* Common implementation of firmware_map_add() and firmware_map_add_early()
* which expects a pre-allocated struct firmware_map_entry.
- **/
+ *
+ * Return: 0 always
+ */
static int firmware_map_add_entry(u64 start, u64 end,
const char *type,
struct firmware_map_entry *entry)
@@ -170,7 +172,7 @@ static int firmware_map_add_entry(u64 start, u64 end,
* @entry: removed entry.
*
* The caller must hold map_entries_lock, and release it properly.
- **/
+ */
static inline void firmware_map_remove_entry(struct firmware_map_entry *entry)
{
list_del(&entry->list);
@@ -208,7 +210,7 @@ static inline void remove_sysfs_fw_map_entry(struct firmware_map_entry *entry)
kobject_put(&entry->kobj);
}
-/*
+/**
* firmware_map_find_entry_in_list() - Search memmap entry in a given list.
* @start: Start of the memory range.
* @end: End of the memory range (exclusive).
@@ -236,7 +238,7 @@ firmware_map_find_entry_in_list(u64 start, u64 end, const char *type,
return NULL;
}
-/*
+/**
* firmware_map_find_entry() - Search memmap entry in map_entries.
* @start: Start of the memory range.
* @end: End of the memory range (exclusive).
@@ -254,7 +256,7 @@ firmware_map_find_entry(u64 start, u64 end, const char *type)
return firmware_map_find_entry_in_list(start, end, type, &map_entries);
}
-/*
+/**
* firmware_map_find_entry_bootmem() - Search memmap entry in map_entries_bootmem.
* @start: Start of the memory range.
* @end: End of the memory range (exclusive).
@@ -283,8 +285,8 @@ firmware_map_find_entry_bootmem(u64 start, u64 end, const char *type)
* similar to function firmware_map_add_early(). The only difference is that
* it will create the syfs entry dynamically.
*
- * Returns 0 on success, or -ENOMEM if no memory could be allocated.
- **/
+ * Return: 0 on success, or -ENOMEM if no memory could be allocated.
+ */
int __meminit firmware_map_add_hotplug(u64 start, u64 end, const char *type)
{
struct firmware_map_entry *entry;
@@ -325,8 +327,8 @@ int __meminit firmware_map_add_hotplug(u64 start, u64 end, const char *type)
*
* That function must be called before late_initcall.
*
- * Returns 0 on success, or -ENOMEM if no memory could be allocated.
- **/
+ * Return: 0 on success, or -ENOMEM if no memory could be allocated.
+ */
int __init firmware_map_add_early(u64 start, u64 end, const char *type)
{
struct firmware_map_entry *entry;
@@ -346,8 +348,8 @@ int __init firmware_map_add_early(u64 start, u64 end, const char *type)
*
* removes a firmware mapping entry.
*
- * Returns 0 on success, or -EINVAL if no entry.
- **/
+ * Return: 0 on success, or -EINVAL if no entry.
+ */
int __meminit firmware_map_remove(u64 start, u64 end, const char *type)
{
struct firmware_map_entry *entry;
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 4dbed4a67aaf..8d9f89b4519d 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2024,7 +2024,6 @@ static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
{
char b[BDEVNAME_SIZE];
struct kobject *ko;
- char *s;
int err;
/* prevent duplicates */
@@ -2070,8 +2069,7 @@ static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
return -EBUSY;
}
bdevname(rdev->bdev,b);
- while ( (s=strchr(b, '/')) != NULL)
- *s = '!';
+ strreplace(b, '/', '!');
rdev->mddev = mddev;
printk(KERN_INFO "md: bind<%s>\n", b);
diff --git a/drivers/misc/altera-stapl/altera.c b/drivers/misc/altera-stapl/altera.c
index bca2630d006f..f53e217e963f 100644
--- a/drivers/misc/altera-stapl/altera.c
+++ b/drivers/misc/altera-stapl/altera.c
@@ -2451,7 +2451,7 @@ int altera_init(struct altera_config *config, const struct firmware *fw)
astate->config = config;
if (!astate->config->jtag_io) {
- dprintk(KERN_INFO "%s: using byteblaster!\n", __func__);
+ dprintk("%s: using byteblaster!\n", __func__);
astate->config->jtag_io = netup_jtag_io_lpt;
}
diff --git a/drivers/misc/kgdbts.c b/drivers/misc/kgdbts.c
index 36f5d52775a9..9a60bd4d3c49 100644
--- a/drivers/misc/kgdbts.c
+++ b/drivers/misc/kgdbts.c
@@ -220,7 +220,7 @@ static unsigned long lookup_addr(char *arg)
else if (!strcmp(arg, "sys_open"))
addr = (unsigned long)do_sys_open;
else if (!strcmp(arg, "do_fork"))
- addr = (unsigned long)do_fork;
+ addr = (unsigned long)_do_fork;
else if (!strcmp(arg, "hw_break_val"))
addr = (unsigned long)&hw_break_val;
addr = (unsigned long) dereference_function_descriptor((void *)addr);
diff --git a/drivers/misc/spear13xx_pcie_gadget.c b/drivers/misc/spear13xx_pcie_gadget.c
index fe3ad0ca9a3e..b8374cdaf9c9 100644
--- a/drivers/misc/spear13xx_pcie_gadget.c
+++ b/drivers/misc/spear13xx_pcie_gadget.c
@@ -2,7 +2,7 @@
* drivers/misc/spear13xx_pcie_gadget.c
*
* Copyright (C) 2010 ST Microelectronics
- * Pratyush Anand<pratyush.anand@st.com>
+ * Pratyush Anand<pratyush.anand@gmail.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index 15731d1db918..97f3acd44798 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -79,6 +79,12 @@ static LIST_HEAD(target_list);
/* This needs to be a spinlock because write_msg() cannot sleep */
static DEFINE_SPINLOCK(target_list_lock);
+/*
+ * Console driver for extended netconsoles. Registered on the first use to
+ * avoid unnecessarily enabling ext message formatting.
+ */
+static struct console netconsole_ext;
+
/**
* struct netconsole_target - Represents a configured netconsole target.
* @list: Links this target into the target_list.
@@ -104,14 +110,15 @@ struct netconsole_target {
#ifdef CONFIG_NETCONSOLE_DYNAMIC
struct config_item item;
#endif
- int enabled;
- struct mutex mutex;
+ bool enabled;
+ bool extended;
struct netpoll np;
};
#ifdef CONFIG_NETCONSOLE_DYNAMIC
static struct configfs_subsystem netconsole_subsys;
+static DEFINE_MUTEX(dynamic_netconsole_mutex);
static int __init dynamic_netconsole_init(void)
{
@@ -185,9 +192,13 @@ static struct netconsole_target *alloc_param_target(char *target_config)
strlcpy(nt->np.dev_name, "eth0", IFNAMSIZ);
nt->np.local_port = 6665;
nt->np.remote_port = 6666;
- mutex_init(&nt->mutex);
eth_broadcast_addr(nt->np.remote_mac);
+ if (*target_config == '+') {
+ nt->extended = true;
+ target_config++;
+ }
+
/* Parse parameters and setup netpoll */
err = netpoll_parse_options(&nt->np, target_config);
if (err)
@@ -197,7 +208,7 @@ static struct netconsole_target *alloc_param_target(char *target_config)
if (err)
goto fail;
- nt->enabled = 1;
+ nt->enabled = true;
return nt;
@@ -258,6 +269,11 @@ static ssize_t show_enabled(struct netconsole_target *nt, char *buf)
return snprintf(buf, PAGE_SIZE, "%d\n", nt->enabled);
}
+static ssize_t show_extended(struct netconsole_target *nt, char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%d\n", nt->extended);
+}
+
static ssize_t show_dev_name(struct netconsole_target *nt, char *buf)
{
return snprintf(buf, PAGE_SIZE, "%s\n", nt->np.dev_name);
@@ -322,13 +338,18 @@ static ssize_t store_enabled(struct netconsole_target *nt,
return err;
if (enabled < 0 || enabled > 1)
return -EINVAL;
- if (enabled == nt->enabled) {
+ if ((bool)enabled == nt->enabled) {
pr_info("network logging has already %s\n",
nt->enabled ? "started" : "stopped");
return -EINVAL;
}
- if (enabled) { /* 1 */
+ if (enabled) { /* true */
+ if (nt->extended && !(netconsole_ext.flags & CON_ENABLED)) {
+ netconsole_ext.flags |= CON_ENABLED;
+ register_console(&netconsole_ext);
+ }
+
/*
* Skip netpoll_parse_options() -- all the attributes are
* already configured via configfs. Just print them out.
@@ -340,13 +361,13 @@ static ssize_t store_enabled(struct netconsole_target *nt,
return err;
pr_info("netconsole: network logging started\n");
- } else { /* 0 */
+ } else { /* false */
/* We need to disable the netconsole before cleaning it up
* otherwise we might end up in write_msg() with
- * nt->np.dev == NULL and nt->enabled == 1
+ * nt->np.dev == NULL and nt->enabled == true
*/
spin_lock_irqsave(&target_list_lock, flags);
- nt->enabled = 0;
+ nt->enabled = false;
spin_unlock_irqrestore(&target_list_lock, flags);
netpoll_cleanup(&nt->np);
}
@@ -356,6 +377,30 @@ static ssize_t store_enabled(struct netconsole_target *nt,
return strnlen(buf, count);
}
+static ssize_t store_extended(struct netconsole_target *nt,
+ const char *buf,
+ size_t count)
+{
+ int extended;
+ int err;
+
+ if (nt->enabled) {
+ pr_err("target (%s) is enabled, disable to update parameters\n",
+ config_item_name(&nt->item));
+ return -EINVAL;
+ }
+
+ err = kstrtoint(buf, 10, &extended);
+ if (err < 0)
+ return err;
+ if (extended < 0 || extended > 1)
+ return -EINVAL;
+
+ nt->extended = extended;
+
+ return strnlen(buf, count);
+}
+
static ssize_t store_dev_name(struct netconsole_target *nt,
const char *buf,
size_t count)
@@ -508,6 +553,7 @@ static struct netconsole_target_attr netconsole_target_##_name = \
__CONFIGFS_ATTR(_name, S_IRUGO | S_IWUSR, show_##_name, store_##_name)
NETCONSOLE_TARGET_ATTR_RW(enabled);
+NETCONSOLE_TARGET_ATTR_RW(extended);
NETCONSOLE_TARGET_ATTR_RW(dev_name);
NETCONSOLE_TARGET_ATTR_RW(local_port);
NETCONSOLE_TARGET_ATTR_RW(remote_port);
@@ -518,6 +564,7 @@ NETCONSOLE_TARGET_ATTR_RW(remote_mac);
static struct configfs_attribute *netconsole_target_attrs[] = {
&netconsole_target_enabled.attr,
+ &netconsole_target_extended.attr,
&netconsole_target_dev_name.attr,
&netconsole_target_local_port.attr,
&netconsole_target_remote_port.attr,
@@ -562,10 +609,10 @@ static ssize_t netconsole_target_attr_store(struct config_item *item,
struct netconsole_target_attr *na =
container_of(attr, struct netconsole_target_attr, attr);
- mutex_lock(&nt->mutex);
+ mutex_lock(&dynamic_netconsole_mutex);
if (na->store)
ret = na->store(nt, buf, count);
- mutex_unlock(&nt->mutex);
+ mutex_unlock(&dynamic_netconsole_mutex);
return ret;
}
@@ -594,7 +641,7 @@ static struct config_item *make_netconsole_target(struct config_group *group,
/*
* Allocate and initialize with defaults.
- * Target is disabled at creation (enabled == 0).
+ * Target is disabled at creation (!enabled).
*/
nt = kzalloc(sizeof(*nt), GFP_KERNEL);
if (!nt)
@@ -604,7 +651,6 @@ static struct config_item *make_netconsole_target(struct config_group *group,
strlcpy(nt->np.dev_name, "eth0", IFNAMSIZ);
nt->np.local_port = 6665;
nt->np.remote_port = 6666;
- mutex_init(&nt->mutex);
eth_broadcast_addr(nt->np.remote_mac);
/* Initialize the config_item member */
@@ -695,7 +741,7 @@ restart:
spin_lock_irqsave(&target_list_lock, flags);
dev_put(nt->np.dev);
nt->np.dev = NULL;
- nt->enabled = 0;
+ nt->enabled = false;
stopped = true;
netconsole_target_put(nt);
goto restart;
@@ -729,6 +775,82 @@ static struct notifier_block netconsole_netdev_notifier = {
.notifier_call = netconsole_netdev_event,
};
+/**
+ * send_ext_msg_udp - send extended log message to target
+ * @nt: target to send message to
+ * @msg: extended log message to send
+ * @msg_len: length of message
+ *
+ * Transfer extended log @msg to @nt. If @msg is longer than
+ * MAX_PRINT_CHUNK, it'll be split and transmitted in multiple chunks with
+ * ncfrag header field added to identify them.
+ */
+static void send_ext_msg_udp(struct netconsole_target *nt, const char *msg,
+ int msg_len)
+{
+ static char buf[MAX_PRINT_CHUNK]; /* protected by target_list_lock */
+ const char *header, *body;
+ int offset = 0;
+ int header_len, body_len;
+
+ if (msg_len <= MAX_PRINT_CHUNK) {
+ netpoll_send_udp(&nt->np, msg, msg_len);
+ return;
+ }
+
+ /* need to insert extra header fields, detect header and body */
+ header = msg;
+ body = memchr(msg, ';', msg_len);
+ if (WARN_ON_ONCE(!body))
+ return;
+
+ header_len = body - header;
+ body_len = msg_len - header_len - 1;
+ body++;
+
+ /*
+ * Transfer multiple chunks with the following extra header.
+ * "ncfrag=<byte-offset>/<total-bytes>"
+ */
+ memcpy(buf, header, header_len);
+
+ while (offset < body_len) {
+ int this_header = header_len;
+ int this_chunk;
+
+ this_header += scnprintf(buf + this_header,
+ sizeof(buf) - this_header,
+ ",ncfrag=%d/%d;", offset, body_len);
+
+ this_chunk = min(body_len - offset,
+ MAX_PRINT_CHUNK - this_header);
+ if (WARN_ON_ONCE(this_chunk <= 0))
+ return;
+
+ memcpy(buf + this_header, body + offset, this_chunk);
+
+ netpoll_send_udp(&nt->np, buf, this_header + this_chunk);
+
+ offset += this_chunk;
+ }
+}
+
+static void write_ext_msg(struct console *con, const char *msg,
+ unsigned int len)
+{
+ struct netconsole_target *nt;
+ unsigned long flags;
+
+ if ((oops_only && !oops_in_progress) || list_empty(&target_list))
+ return;
+
+ spin_lock_irqsave(&target_list_lock, flags);
+ list_for_each_entry(nt, &target_list, list)
+ if (nt->extended && nt->enabled && netif_running(nt->np.dev))
+ send_ext_msg_udp(nt, msg, len);
+ spin_unlock_irqrestore(&target_list_lock, flags);
+}
+
static void write_msg(struct console *con, const char *msg, unsigned int len)
{
int frag, left;
@@ -744,8 +866,7 @@ static void write_msg(struct console *con, const char *msg, unsigned int len)
spin_lock_irqsave(&target_list_lock, flags);
list_for_each_entry(nt, &target_list, list) {
- netconsole_target_get(nt);
- if (nt->enabled && netif_running(nt->np.dev)) {
+ if (!nt->extended && nt->enabled && netif_running(nt->np.dev)) {
/*
* We nest this inside the for-each-target loop above
* so that we're able to get as much logging out to
@@ -760,11 +881,16 @@ static void write_msg(struct console *con, const char *msg, unsigned int len)
left -= frag;
}
}
- netconsole_target_put(nt);
}
spin_unlock_irqrestore(&target_list_lock, flags);
}
+static struct console netconsole_ext = {
+ .name = "netcon_ext",
+ .flags = CON_EXTENDED, /* starts disabled, registered on first use */
+ .write = write_ext_msg,
+};
+
static struct console netconsole = {
.name = "netcon",
.flags = CON_ENABLED,
@@ -787,7 +913,11 @@ static int __init init_netconsole(void)
goto fail;
}
/* Dump existing printks when we register */
- netconsole.flags |= CON_PRINTBUFFER;
+ if (nt->extended)
+ netconsole_ext.flags |= CON_PRINTBUFFER |
+ CON_ENABLED;
+ else
+ netconsole.flags |= CON_PRINTBUFFER;
spin_lock_irqsave(&target_list_lock, flags);
list_add(&nt->list, &target_list);
@@ -803,6 +933,8 @@ static int __init init_netconsole(void)
if (err)
goto undonotifier;
+ if (netconsole_ext.flags & CON_ENABLED)
+ register_console(&netconsole_ext);
register_console(&netconsole);
pr_info("network logging started\n");
@@ -831,6 +963,7 @@ static void __exit cleanup_netconsole(void)
{
struct netconsole_target *nt, *tmp;
+ unregister_console(&netconsole_ext);
unregister_console(&netconsole);
dynamic_netconsole_exit();
unregister_netdevice_notifier(&netconsole_netdev_notifier);
diff --git a/drivers/pci/host/pcie-spear13xx.c b/drivers/pci/host/pcie-spear13xx.c
index dfec4281bd50..c49fbdc0f6e4 100644
--- a/drivers/pci/host/pcie-spear13xx.c
+++ b/drivers/pci/host/pcie-spear13xx.c
@@ -4,8 +4,8 @@
* SPEAr13xx PCIe Glue Layer Source Code
*
* Copyright (C) 2010-2014 ST Microelectronics
- * Pratyush Anand <pratyush.anand@st.com>
- * Mohit Kumar <mohit.kumar@st.com>
+ * Pratyush Anand <pratyush.anand@gmail.com>
+ * Mohit Kumar <mohit.kumar.dhaka@gmail.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
@@ -386,5 +386,5 @@ static int __init spear13xx_pcie_init(void)
module_init(spear13xx_pcie_init);
MODULE_DESCRIPTION("ST Microelectronics SPEAr13xx PCIe host controller driver");
-MODULE_AUTHOR("Pratyush Anand <pratyush.anand@st.com>");
+MODULE_AUTHOR("Pratyush Anand <pratyush.anand@gmail.com>");
MODULE_LICENSE("GPL v2");
diff --git a/drivers/phy/phy-spear1310-miphy.c b/drivers/phy/phy-spear1310-miphy.c
index 65ae640cfbd1..45d0005b2203 100644
--- a/drivers/phy/phy-spear1310-miphy.c
+++ b/drivers/phy/phy-spear1310-miphy.c
@@ -2,8 +2,8 @@
* ST SPEAr1310-miphy driver
*
* Copyright (C) 2014 ST Microelectronics
- * Pratyush Anand <pratyush.anand@st.com>
- * Mohit Kumar <mohit.kumar@st.com>
+ * Pratyush Anand <pratyush.anand@gmail.com>
+ * Mohit Kumar <mohit.kumar.dhaka@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -257,5 +257,5 @@ static struct platform_driver spear1310_miphy_driver = {
module_platform_driver(spear1310_miphy_driver);
MODULE_DESCRIPTION("ST SPEAR1310-MIPHY driver");
-MODULE_AUTHOR("Pratyush Anand <pratyush.anand@st.com>");
+MODULE_AUTHOR("Pratyush Anand <pratyush.anand@gmail.com>");
MODULE_LICENSE("GPL v2");
diff --git a/drivers/phy/phy-spear1340-miphy.c b/drivers/phy/phy-spear1340-miphy.c
index 1a00c2817f34..494240da4a39 100644
--- a/drivers/phy/phy-spear1340-miphy.c
+++ b/drivers/phy/phy-spear1340-miphy.c
@@ -2,8 +2,8 @@
* ST spear1340-miphy driver
*
* Copyright (C) 2014 ST Microelectronics
- * Pratyush Anand <pratyush.anand@st.com>
- * Mohit Kumar <mohit.kumar@st.com>
+ * Pratyush Anand <pratyush.anand@gmail.com>
+ * Mohit Kumar <mohit.kumar.dhaka@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -290,5 +290,5 @@ static struct platform_driver spear1340_miphy_driver = {
module_platform_driver(spear1340_miphy_driver);
MODULE_DESCRIPTION("ST SPEAR1340-MIPHY driver");
-MODULE_AUTHOR("Pratyush Anand <pratyush.anand@st.com>");
+MODULE_AUTHOR("Pratyush Anand <pratyush.anand@gmail.com>");
MODULE_LICENSE("GPL v2");
diff --git a/drivers/usb/misc/lvstest.c b/drivers/usb/misc/lvstest.c
index 62cb8cd08403..86b4e4b2ab9a 100644
--- a/drivers/usb/misc/lvstest.c
+++ b/drivers/usb/misc/lvstest.c
@@ -4,7 +4,7 @@
* Test pattern generation for Link Layer Validation System Tests
*
* Copyright (C) 2014 ST Microelectronics
- * Pratyush Anand <pratyush.anand@st.com>
+ * Pratyush Anand <pratyush.anand@gmail.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any