LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Toshi Kani <toshi.kani@hp.com>
To: akpm@linux-foundation.org, hpa@zytor.com, tglx@linutronix.de,
	mingo@redhat.com, arnd@arndb.de, linux-mm@kvack.org
Cc: x86@kernel.org, linux-kernel@vger.kernel.org,
	Toshi Kani <toshi.kani@hp.com>
Subject: [RFC PATCH 5/7] x86, mm: Support huge KVA mappings on x86
Date: Mon, 26 Jan 2015 16:13:27 -0700	[thread overview]
Message-ID: <1422314009-31667-6-git-send-email-toshi.kani@hp.com> (raw)
In-Reply-To: <1422314009-31667-1-git-send-email-toshi.kani@hp.com>

Implement huge KVA mapping interfaces and select
CONFIG_HAVE_ARCH_HUGE_VMAP on x86.

Signed-off-by: Toshi Kani <toshi.kani@hp.com>
---
 arch/x86/Kconfig      |    1 +
 arch/x86/mm/pgtable.c |   32 ++++++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 0dc9d01..8150038 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -97,6 +97,7 @@ config X86
 	select IRQ_FORCED_THREADING
 	select HAVE_BPF_JIT if X86_64
 	select HAVE_ARCH_TRANSPARENT_HUGEPAGE
+	select HAVE_ARCH_HUGE_VMAP
 	select ARCH_HAS_SG_CHAIN
 	select CLKEVT_I8253
 	select ARCH_HAVE_NMI_SAFE_CMPXCHG
diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index 6fb6927..e113d69 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -481,3 +481,35 @@ void native_set_fixmap(enum fixed_addresses idx, phys_addr_t phys,
 {
 	__native_set_fixmap(idx, pfn_pte(phys >> PAGE_SHIFT, flags));
 }
+
+void pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot)
+{
+	set_pte((pte_t *)pud, pfn_pte(
+		(u64)addr >> PAGE_SHIFT,
+		__pgprot(pgprot_val(prot) | _PAGE_PSE)));
+}
+
+void pmd_set_huge(pmd_t *pmd, phys_addr_t addr, pgprot_t prot)
+{
+	set_pte((pte_t *)pmd, pfn_pte(
+		(u64)addr >> PAGE_SHIFT,
+		__pgprot(pgprot_val(prot) | _PAGE_PSE)));
+}
+
+int pud_clear_huge(pud_t *pud)
+{
+	if (pud_large(*pud)) {
+		pud_clear(pud);
+		return 1;
+	}
+	return 0;
+}
+
+int pmd_clear_huge(pmd_t *pmd)
+{
+	if (pmd_large(*pmd)) {
+		pmd_clear(pmd);
+		return 1;
+	}
+	return 0;
+}

  parent reply	other threads:[~2015-01-26 23:31 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-26 23:13 [RFC PATCH 0/7] Kernel huge I/O mapping support Toshi Kani
2015-01-26 23:13 ` [RFC PATCH 1/7] mm: Change __get_vm_area_node() to use fls_long() Toshi Kani
2015-01-26 23:13 ` [RFC PATCH 2/7] lib: Add huge I/O map capability interfaces Toshi Kani
2015-01-26 23:54   ` Andrew Morton
2015-01-27  1:01     ` Toshi Kani
2015-01-27 21:37       ` Andrew Morton
2015-01-27 22:01         ` Toshi Kani
2015-02-05 20:56       ` Toshi Kani
2015-01-26 23:13 ` [RFC PATCH 3/7] mm: Change ioremap to set up huge I/O mappings Toshi Kani
2015-01-26 23:58   ` Andrew Morton
2015-01-27  0:01     ` Toshi Kani
2015-01-26 23:13 ` [RFC PATCH 4/7] mm: Change vunmap to tear down huge KVA mappings Toshi Kani
2015-01-26 23:13 ` Toshi Kani [this message]
2015-01-26 23:13 ` [RFC PATCH 6/7] x86, mm: Support huge I/O mappings on x86 Toshi Kani
2015-01-26 23:13 ` [RFC PATCH 7/7] mm: Add config HUGE_IOMAP to enable huge I/O mappings Toshi Kani

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1422314009-31667-6-git-send-email-toshi.kani@hp.com \
    --to=toshi.kani@hp.com \
    --cc=akpm@linux-foundation.org \
    --cc=arnd@arndb.de \
    --cc=hpa@zytor.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=mingo@redhat.com \
    --cc=tglx@linutronix.de \
    --cc=x86@kernel.org \
    --subject='Re: [RFC PATCH 5/7] x86, mm: Support huge KVA mappings on x86' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).