From: Toshi Kani <toshi.kani@hp.com> To: hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com, akpm@linux-foundation.org, arnd@arndb.de Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, x86@kernel.org, linux-nvdimm@lists.01.org, jgross@suse.com, stefan.bader@canonical.com, luto@amacapital.net, hmh@hmh.eng.br, yigal@plexistor.com, konrad.wilk@oracle.com, Elliott@hp.com, mcgrof@suse.com, hch@lst.de, Toshi Kani <toshi.kani@hp.com> Subject: [PATCH v9 10/10] drivers/block/pmem: Map NVDIMM with ioremap_wt() Date: Wed, 13 May 2015 15:05:51 -0600 [thread overview] Message-ID: <1431551151-19124-11-git-send-email-toshi.kani@hp.com> (raw) In-Reply-To: <1431551151-19124-1-git-send-email-toshi.kani@hp.com> The pmem driver maps NVDIMM with ioremap_nocache() as we cannot write back the contents of the CPU caches in case of a crash. This patch changes to use ioremap_wt(), which provides uncached writes but cached reads, for improving read performance. Signed-off-by: Toshi Kani <toshi.kani@hp.com> --- drivers/block/pmem.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/block/pmem.c b/drivers/block/pmem.c index eabf4a8..095dfaa 100644 --- a/drivers/block/pmem.c +++ b/drivers/block/pmem.c @@ -139,11 +139,11 @@ static struct pmem_device *pmem_alloc(struct device *dev, struct resource *res) } /* - * Map the memory as non-cachable, as we can't write back the contents + * Map the memory as write-through, as we can't write back the contents * of the CPU caches in case of a crash. */ err = -ENOMEM; - pmem->virt_addr = ioremap_nocache(pmem->phys_addr, pmem->size); + pmem->virt_addr = ioremap_wt(pmem->phys_addr, pmem->size); if (!pmem->virt_addr) goto out_release_region; -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
WARNING: multiple messages have this Message-ID (diff)
From: Toshi Kani <toshi.kani@hp.com> To: hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com, akpm@linux-foundation.org, arnd@arndb.de Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, x86@kernel.org, linux-nvdimm@ml01.01.org, jgross@suse.com, stefan.bader@canonical.com, luto@amacapital.net, hmh@hmh.eng.br, yigal@plexistor.com, konrad.wilk@oracle.com, Elliott@hp.com, mcgrof@suse.com, hch@lst.de, Toshi Kani <toshi.kani@hp.com> Subject: [PATCH v9 10/10] drivers/block/pmem: Map NVDIMM with ioremap_wt() Date: Wed, 13 May 2015 15:05:51 -0600 [thread overview] Message-ID: <1431551151-19124-11-git-send-email-toshi.kani@hp.com> (raw) In-Reply-To: <1431551151-19124-1-git-send-email-toshi.kani@hp.com> The pmem driver maps NVDIMM with ioremap_nocache() as we cannot write back the contents of the CPU caches in case of a crash. This patch changes to use ioremap_wt(), which provides uncached writes but cached reads, for improving read performance. Signed-off-by: Toshi Kani <toshi.kani@hp.com> --- drivers/block/pmem.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/block/pmem.c b/drivers/block/pmem.c index eabf4a8..095dfaa 100644 --- a/drivers/block/pmem.c +++ b/drivers/block/pmem.c @@ -139,11 +139,11 @@ static struct pmem_device *pmem_alloc(struct device *dev, struct resource *res) } /* - * Map the memory as non-cachable, as we can't write back the contents + * Map the memory as write-through, as we can't write back the contents * of the CPU caches in case of a crash. */ err = -ENOMEM; - pmem->virt_addr = ioremap_nocache(pmem->phys_addr, pmem->size); + pmem->virt_addr = ioremap_wt(pmem->phys_addr, pmem->size); if (!pmem->virt_addr) goto out_release_region;
next prev parent reply other threads:[~2015-05-13 21:05 UTC|newest] Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-05-13 21:05 [PATCH v9 0/10] Support Write-Through mapping on x86 Toshi Kani 2015-05-13 21:05 ` Toshi Kani 2015-05-13 21:05 ` [PATCH v9 1/10] x86, mm, pat: Set WT to PA7 slot of PAT MSR Toshi Kani 2015-05-13 21:05 ` Toshi Kani 2015-05-22 6:55 ` Thomas Gleixner 2015-05-22 6:55 ` Thomas Gleixner 2015-05-13 21:05 ` [PATCH v9 2/10] x86, mm, pat: Change reserve_memtype() for WT Toshi Kani 2015-05-13 21:05 ` Toshi Kani 2015-05-22 7:01 ` Thomas Gleixner 2015-05-22 7:01 ` Thomas Gleixner 2015-05-13 21:05 ` [PATCH v9 3/10] x86, asm: Change is_new_memtype_allowed() " Toshi Kani 2015-05-13 21:05 ` Toshi Kani 2015-05-22 7:02 ` Thomas Gleixner 2015-05-22 7:02 ` Thomas Gleixner 2015-05-13 21:05 ` [PATCH v9 4/10] x86, mm, asm-gen: Add ioremap_wt() " Toshi Kani 2015-05-13 21:05 ` Toshi Kani 2015-05-22 7:08 ` Thomas Gleixner 2015-05-22 7:08 ` Thomas Gleixner 2015-05-13 21:05 ` [PATCH v9 5/10] arch/*/asm/io.h: Add ioremap_wt() to all architectures Toshi Kani 2015-05-13 21:05 ` Toshi Kani 2015-05-22 7:15 ` Thomas Gleixner 2015-05-22 7:15 ` Thomas Gleixner 2015-05-22 14:08 ` Toshi Kani 2015-05-22 14:08 ` Toshi Kani 2015-05-13 21:05 ` [PATCH v9 6/10] x86, mm, pat: Add pgprot_writethrough() for WT Toshi Kani 2015-05-13 21:05 ` Toshi Kani 2015-05-22 7:16 ` Thomas Gleixner 2015-05-22 7:16 ` Thomas Gleixner 2015-05-13 21:05 ` [PATCH v9 7/10] x86, mm, asm: Add WT support to set_page_memtype() Toshi Kani 2015-05-13 21:05 ` Toshi Kani 2015-05-22 7:35 ` Thomas Gleixner 2015-05-22 7:35 ` Thomas Gleixner 2015-05-22 15:04 ` Toshi Kani 2015-05-22 15:04 ` Toshi Kani 2015-05-13 21:05 ` [PATCH v9 8/10] x86, mm: Add set_memory_wt() for WT Toshi Kani 2015-05-13 21:05 ` Toshi Kani 2015-05-22 7:48 ` Thomas Gleixner 2015-05-22 7:48 ` Thomas Gleixner 2015-05-22 15:30 ` Toshi Kani 2015-05-22 15:30 ` Toshi Kani 2015-05-13 21:05 ` [PATCH v9 9/10] x86, mm, pat: Refactor !pat_enabled handling Toshi Kani 2015-05-13 21:05 ` Toshi Kani 2015-05-22 8:34 ` Thomas Gleixner 2015-05-22 8:34 ` Thomas Gleixner 2015-05-22 16:27 ` Toshi Kani 2015-05-22 16:27 ` Toshi Kani 2015-05-13 21:05 ` Toshi Kani [this message] 2015-05-13 21:05 ` [PATCH v9 10/10] drivers/block/pmem: Map NVDIMM with ioremap_wt() Toshi Kani 2015-05-14 21:52 ` Dan Williams 2015-05-14 21:52 ` Dan Williams 2015-05-14 22:20 ` Toshi Kani 2015-05-14 22:20 ` Toshi Kani
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