LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Chintan Pandya <cpandya@codeaurora.org>
To: catalin.marinas@arm.com, will.deacon@arm.com,
	mark.rutland@arm.com, toshi.kani@hpe.com
Cc: arnd@arndb.de, ard.biesheuvel@linaro.org, marc.zyngier@arm.com,
	james.morse@arm.com, kristina.martsenko@arm.com,
	takahiro.akashi@linaro.org, gregkh@linuxfoundation.org,
	tglx@linutronix.de, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
	akpm@linux-foundation.org,
	Chintan Pandya <cpandya@codeaurora.org>
Subject: [PATCH v8 3/4] arm64: Implement page table free interfaces
Date: Tue,  3 Apr 2018 13:30:45 +0530	[thread overview]
Message-ID: <1522742446-5084-4-git-send-email-cpandya@codeaurora.org> (raw)
In-Reply-To: <1522742446-5084-1-git-send-email-cpandya@codeaurora.org>

Implement pud_free_pmd_page() and pmd_free_pte_page().

Implementation requires,
 1) Clearing off the current pud/pmd entry
 2) Invalidate TLB which could have previously
    valid but not stale entry
 3) Freeing of the un-used next level page tables

Signed-off-by: Chintan Pandya <cpandya@codeaurora.org>
---
 arch/arm64/mm/mmu.c | 29 +++++++++++++++++++++++++----
 1 file changed, 25 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index da98828..0f651db 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -45,6 +45,7 @@
 #include <asm/memblock.h>
 #include <asm/mmu_context.h>
 #include <asm/ptdump.h>
+#include <asm/tlbflush.h>
 
 #define NO_BLOCK_MAPPINGS	BIT(0)
 #define NO_CONT_MAPPINGS	BIT(1)
@@ -973,12 +974,32 @@ int pmd_clear_huge(pmd_t *pmdp)
 	return 1;
 }
 
-int pud_free_pmd_page(pud_t *pud, unsigned long addr)
+int pmd_free_pte_page(pmd_t *pmdp, unsigned long addr)
 {
-	return pud_none(*pud);
+	pmd_t *table;
+
+	if (pmd_present(READ_ONCE(*pmdp))) {
+		table = __va(pmd_val(*pmdp));
+		pmd_clear(pmdp);
+		__flush_tlb_kernel_pgtable(addr);
+		free_page((unsigned long) table);
+	}
+	return 1;
 }
 
-int pmd_free_pte_page(pmd_t *pmd, unsigned long addr)
+int pud_free_pmd_page(pud_t *pudp, unsigned long addr)
 {
-	return pmd_none(*pmd);
+	pmd_t *table;
+	int i;
+
+	if (pud_present(READ_ONCE(*pudp))) {
+		table = __va(pud_val(*pudp));
+		for (i = 0; i < PTRS_PER_PMD; i++)
+			pmd_free_pte_page(&table[i], addr + (i * PMD_SIZE));
+
+		pud_clear(pudp);
+		__flush_tlb_kernel_pgtable(addr);
+		free_page((unsigned long) table);
+	}
+	return 1;
 }
-- 
Qualcomm India Private Limited, on behalf of Qualcomm Innovation
Center, Inc., is a member of Code Aurora Forum, a Linux Foundation
Collaborative Project

  parent reply	other threads:[~2018-04-03  8:00 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-03  8:00 [PATCH v8 0/4] Fix issues with huge mapping in ioremap for ARM64 Chintan Pandya
2018-04-03  8:00 ` [PATCH v8 1/4] ioremap: Update pgtable free interfaces with addr Chintan Pandya
2018-04-03  8:00 ` [PATCH v8 2/4] arm64: tlbflush: Introduce __flush_tlb_kernel_pgtable Chintan Pandya
2018-04-27 10:29   ` Catalin Marinas
2018-04-27 12:30     ` Chintan Pandya
2018-04-03  8:00 ` Chintan Pandya [this message]
2018-04-03  8:00 ` [PATCH v8 4/4] Revert "arm64: Enforce BBM for huge IO/VMAP mappings" Chintan Pandya
2018-04-03  8:43 ` [PATCH v8 0/4] Fix issues with huge mapping in ioremap for ARM64 Marc Zyngier
2018-04-03 11:55   ` Chintan Pandya
2018-04-05  9:09     ` Chintan Pandya
2018-04-17 10:25 ` Chintan Pandya
2018-04-27 10:27   ` Catalin Marinas

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=1522742446-5084-4-git-send-email-cpandya@codeaurora.org \
    --to=cpandya@codeaurora.org \
    --cc=akpm@linux-foundation.org \
    --cc=ard.biesheuvel@linaro.org \
    --cc=arnd@arndb.de \
    --cc=catalin.marinas@arm.com \
    --cc=gregkh@linuxfoundation.org \
    --cc=james.morse@arm.com \
    --cc=kristina.martsenko@arm.com \
    --cc=linux-arch@vger.kernel.org \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=marc.zyngier@arm.com \
    --cc=mark.rutland@arm.com \
    --cc=takahiro.akashi@linaro.org \
    --cc=tglx@linutronix.de \
    --cc=toshi.kani@hpe.com \
    --cc=will.deacon@arm.com \
    --subject='Re: [PATCH v8 3/4] arm64: Implement page table free interfaces' \
    /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).