From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-ID: <54F844B3.9050303@plexistor.com> Date: Thu, 05 Mar 2015 13:57:39 +0200 From: Boaz Harrosh MIME-Version: 1.0 Subject: [PATCH 4/8] pmem: Add support for direct_access() References: <54F82CE0.4040502@plexistor.com> <54F830D4.7030205@plexistor.com> In-Reply-To: <54F830D4.7030205@plexistor.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org To: Ingo Molnar , x86@kernel.org, linux-kernel , "Roger C. Pao" , Dan Williams , Thomas Gleixner , linux-nvdimm , "H. Peter Anvin" , Matthew Wilcox , Andy Lutomirski , Christoph Hellwig Cc: Ross Zwisler List-ID: From: Ross Zwisler Also fixed a top the initial version [boaz] SQUASHME pmem: Micro optimization the hotpath 002 Signed-off-by: Ross Zwisler Signed-off-by: Boaz Harrosh --- drivers/block/pmem.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/block/pmem.c b/drivers/block/pmem.c index 750ffdf..f0f0ba0 100644 --- a/drivers/block/pmem.c +++ b/drivers/block/pmem.c @@ -111,9 +111,25 @@ static int pmem_rw_page(struct block_device *bdev, sector_t sector, return 0; } +static long pmem_direct_access(struct block_device *bdev, sector_t sector, + void **kaddr, unsigned long *pfn, long size) +{ + struct pmem_device *pmem = bdev->bd_disk->private_data; + size_t offset = sector << 9; + + if (unlikely(!pmem)) + return -ENODEV; + + *kaddr = pmem->virt_addr + offset; + *pfn = (pmem->phys_addr + offset) >> PAGE_SHIFT; + + return pmem->size - offset; +} + static const struct block_device_operations pmem_fops = { .owner = THIS_MODULE, .rw_page = pmem_rw_page, + .direct_access = pmem_direct_access, }; /* Kernel module stuff */ -- 1.9.3