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Date: Tue, 09 Sep 2014 18:44:55 +0300
From: Boaz Harrosh <boaz@...xistor.com>
To: Ross Zwisler <ross.zwisler@...ux.intel.com>,
Jens Axboe <axboe@...com>,
Matthew Wilcox <matthew.r.wilcox@...el.com>,
linux-fsdevel <linux-fsdevel@...r.kernel.org>,
linux-nvdimm@...ts.01.org
CC: Andrew Morton <akpm@...ux-foundation.org>,
linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH 4/9] SQUASHME: pmem: Support of multiple memory regions
From: Boaz Harrosh <boaz@...xistor.com>
After the last patch this is easy.
The API to pmem module is changed. We now have a single string
parameter named "map" of the form:
map=mapS[,mapS...]
where mapS=nn[KMG]$ss[KMG],
or mapS=nn[KMG]@ss[KMG],
nn=size, ss=offset
Just like the Kernel command line map && memmap parameters,
so anything you did at grub just copy/paste to here.
The "@" form is exactly the same as the "$" form only that
at bash prompt we need to escape the "$" with \$ so also
support the '@' char for convenience.
For each specified mapS there will be a device created.
So needless to say that all the previous prd_XXX params are
removed as well as the Kconfig defaults.
Signed-off-by: Boaz Harrosh <boaz@...xistor.com>
---
drivers/block/Kconfig | 28 -----------------------
drivers/block/pmem.c | 62 ++++++++++++++++++++++++++++++++++++---------------
2 files changed, 44 insertions(+), 46 deletions(-)
diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
index 2d50125..5da8cbf 100644
--- a/drivers/block/Kconfig
+++ b/drivers/block/Kconfig
@@ -416,34 +416,6 @@ config BLK_DEV_PMEM
Most normal users won't need this functionality, and can thus say N
here.
-config BLK_DEV_PMEM_START
- int "Offset in GiB of where to start claiming space"
- default "0"
- depends on BLK_DEV_PMEM
- help
- Starting offset in GiB that PMEM should use when claiming memory. This
- memory needs to be reserved from the OS at boot time using the
- "memmap" kernel parameter.
-
- If you provide PMEM with volatile memory it will act as a volatile
- RAM disk and your data will not be persistent.
-
-config BLK_DEV_PMEM_COUNT
- int "Default number of PMEM disks"
- default "4"
- depends on BLK_DEV_PMEM
- help
- Number of equal sized block devices that PMEM should create.
-
-config BLK_DEV_PMEM_SIZE
- int "Size in GiB of space to claim"
- depends on BLK_DEV_PMEM
- default "0"
- help
- Amount of memory in GiB that PMEM should use when creating block
- devices. This memory needs to be reserved from the OS at
- boot time using the "memmap" kernel parameter.
-
config CDROM_PKTCDVD
tristate "Packet writing on CD/DVD media"
depends on !UML
diff --git a/drivers/block/pmem.c b/drivers/block/pmem.c
index d5c5c52..e07a373 100644
--- a/drivers/block/pmem.c
+++ b/drivers/block/pmem.c
@@ -212,17 +212,11 @@ static const struct block_device_operations pmem_fops = {
};
/* Kernel module stuff */
-static int pmem_start_gb = CONFIG_BLK_DEV_PMEM_START;
-module_param(pmem_start_gb, int, S_IRUGO);
-MODULE_PARM_DESC(pmem_start_gb, "Offset in GB of where to start claiming space");
-
-static int pmem_size_gb = CONFIG_BLK_DEV_PMEM_SIZE;
-module_param(pmem_size_gb, int, S_IRUGO);
-MODULE_PARM_DESC(pmem_size_gb, "Total size in GB of space to claim for all disks");
-
-static int pmem_count = CONFIG_BLK_DEV_PMEM_COUNT;
-module_param(pmem_count, int, S_IRUGO);
-MODULE_PARM_DESC(pmem_count, "Number of pmem devices to evenly split allocated space");
+static char *map;
+module_param(map, charp, S_IRUGO);
+MODULE_PARM_DESC(map,
+ "pmem device mapping: map=mapS[,mapS...] where:\n"
+ "mapS=nn[KMG]$ss[KMG] or mapS=nn[KMG]@ss[KMG], nn=size, ss=offset.");
static LIST_HEAD(pmem_devices);
static int pmem_major;
@@ -272,6 +266,13 @@ static struct pmem_device *pmem_alloc(phys_addr_t phys_addr, size_t disk_size,
struct gendisk *disk;
int err;
+ if (unlikely((phys_addr & ~PAGE_MASK) || (disk_size & ~PAGE_MASK))) {
+ pr_err("phys_addr=0x%llx disk_size=0x%zx must be 4k aligned\n",
+ phys_addr, disk_size);
+ err = -EINVAL;
+ goto out;
+ }
+
pmem = kzalloc(sizeof(*pmem), GFP_KERNEL);
if (unlikely(!pmem)) {
err = -ENOMEM;
@@ -344,16 +345,32 @@ static void pmem_del_one(struct pmem_device *pmem)
pmem_free(pmem);
}
+static int pmem_parse_map_one(char *map, phys_addr_t *start, size_t *size)
+{
+ char *p = map;
+
+ *size = (size_t)memparse(p, &p);
+ if ((p == map) || ((*p != '$') && (*p != '@')))
+ return -EINVAL;
+
+ if (!*(++p))
+ return -EINVAL;
+
+ *start = (phys_addr_t)memparse(p, &p);
+
+ return *p == '\0' ? 0 : -EINVAL;
+}
+
static int __init pmem_init(void)
{
int result, i;
struct pmem_device *pmem, *next;
- phys_addr_t phys_addr;
- size_t total_size, disk_size;
+ char *p, *pmem_map = map;
- phys_addr = (phys_addr_t) pmem_start_gb * 1024 * 1024 * 1024;
- total_size = (size_t) pmem_size_gb * 1024 * 1024 * 1024;
- disk_size = total_size / pmem_count;
+ if (!pmem_map) {
+ pr_err("pmem: must specify map=nn@ss parameter.\n");
+ return -EINVAL;
+ }
result = register_blkdev(0, "pmem");
if (result < 0)
@@ -361,14 +378,23 @@ static int __init pmem_init(void)
else
pmem_major = result;
- for (i = 0; i < pmem_count; i++) {
+ i = 0;
+ while ((p = strsep(&pmem_map, ",")) != NULL) {
+ phys_addr_t phys_addr;
+ size_t disk_size;
+
+ if (!*p)
+ continue;
+ result = pmem_parse_map_one(p, &phys_addr, &disk_size);
+ if (result)
+ goto out_free;
pmem = pmem_alloc(phys_addr, disk_size, i);
if (IS_ERR(pmem)) {
result = PTR_ERR(pmem);
goto out_free;
}
list_add_tail(&pmem->pmem_list, &pmem_devices);
- phys_addr += disk_size;
+ ++i;
}
list_for_each_entry(pmem, &pmem_devices, pmem_list)
--
1.9.3
--
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