From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Andrew Morton <akpm@linux-foundation.org>,
Jason Gunthorpe <jgg@nvidia.com>, Peter Xu <peterx@redhat.com>,
Oscar Salvador <osalvador@suse.de>,
Michael Ellerman <mpe@ellerman.id.au>,
Nicholas Piggin <npiggin@gmail.com>
Cc: linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org,
linux-kernel@vger.kernel.org
Subject: [RFC PATCH v2 16/20] powerpc/e500: Encode hugepage size in PTE bits
Date: Fri, 17 May 2024 21:00:10 +0200 [thread overview]
Message-ID: <f4f76cf605b84ff60cd8cb347775a8ff2338ce18.1715971869.git.christophe.leroy@csgroup.eu> (raw)
In-Reply-To: <cover.1715971869.git.christophe.leroy@csgroup.eu>
Use U0-U3 bits to encode hugepage size, more exactly page shift.
As we start using hugepages at shift 21 (2Mbytes), substract 20
so that it fits into 4 bits. That may change in the future if
we want to use smaller hugepages.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/include/asm/nohash/hugetlb-e500.h | 6 ++++++
arch/powerpc/include/asm/nohash/pte-e500.h | 3 +++
2 files changed, 9 insertions(+)
diff --git a/arch/powerpc/include/asm/nohash/hugetlb-e500.h b/arch/powerpc/include/asm/nohash/hugetlb-e500.h
index 8f04ad20e040..d8e51a3f8557 100644
--- a/arch/powerpc/include/asm/nohash/hugetlb-e500.h
+++ b/arch/powerpc/include/asm/nohash/hugetlb-e500.h
@@ -42,4 +42,10 @@ static inline int check_and_get_huge_psize(int shift)
return shift_to_mmu_psize(shift);
}
+static inline pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags)
+{
+ return __pte(pte_val(entry) | (_PAGE_U3 * (shift - 20)));
+}
+#define arch_make_huge_pte arch_make_huge_pte
+
#endif /* _ASM_POWERPC_NOHASH_HUGETLB_E500_H */
diff --git a/arch/powerpc/include/asm/nohash/pte-e500.h b/arch/powerpc/include/asm/nohash/pte-e500.h
index 975facc7e38e..091e4bff1fba 100644
--- a/arch/powerpc/include/asm/nohash/pte-e500.h
+++ b/arch/powerpc/include/asm/nohash/pte-e500.h
@@ -46,6 +46,9 @@
#define _PAGE_NO_CACHE 0x400000 /* I: cache inhibit */
#define _PAGE_WRITETHRU 0x800000 /* W: cache write-through */
+#define _PAGE_HSIZE_MSK (_PAGE_U0 | _PAGE_U1 | _PAGE_U2 | _PAGE_U3)
+#define _PAGE_HSIZE_SHIFT 14
+
/* "Higher level" linux bit combinations */
#define _PAGE_EXEC (_PAGE_BAP_SX | _PAGE_BAP_UX) /* .. and was cache cleaned */
#define _PAGE_READ (_PAGE_BAP_SR | _PAGE_BAP_UR) /* User read permission */
--
2.44.0
next prev parent reply other threads:[~2024-05-17 19:04 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-17 18:59 [RFC PATCH v2 00/20] Reimplement huge pages without hugepd on powerpc (8xx, e500, book3s/64) Christophe Leroy
2024-05-17 18:59 ` [RFC PATCH v2 01/20] mm: Provide pagesize to pmd_populate() Christophe Leroy
2024-05-20 9:01 ` Oscar Salvador
2024-05-20 16:24 ` Christophe Leroy
2024-05-21 11:57 ` Oscar Salvador
2024-05-22 8:37 ` Christophe Leroy
2024-05-17 18:59 ` [RFC PATCH v2 02/20] mm: Provide page size to pte_alloc_huge() Christophe Leroy
2024-05-17 18:59 ` [RFC PATCH v2 03/20] mm: Provide pmd to pte_leaf_size() Christophe Leroy
2024-05-21 9:39 ` Oscar Salvador
2024-05-22 10:22 ` Christophe Leroy
2024-05-17 18:59 ` [RFC PATCH v2 04/20] mm: Provide mm_struct and address to huge_ptep_get() Christophe Leroy
2024-05-17 18:59 ` [RFC PATCH v2 05/20] powerpc/mm: Allow hugepages without hugepd Christophe Leroy
2024-05-17 19:00 ` [RFC PATCH v2 06/20] powerpc/8xx: Fix size given to set_huge_pte_at() Christophe Leroy
2024-05-20 9:14 ` Oscar Salvador
2024-05-20 16:31 ` Christophe Leroy
2024-05-20 17:42 ` Oscar Salvador
2024-05-22 8:45 ` Christophe Leroy
2024-05-21 0:48 ` Michael Ellerman
2024-05-21 9:26 ` Oscar Salvador
2024-05-22 8:32 ` Christophe Leroy
2024-05-22 12:18 ` Christophe Leroy
2024-05-17 19:00 ` [RFC PATCH v2 07/20] powerpc/8xx: Rework support for 8M pages using contiguous PTE entries Christophe Leroy
2024-05-24 10:02 ` Oscar Salvador
2024-05-24 11:47 ` Christophe Leroy
2024-05-17 19:00 ` [RFC PATCH v2 08/20] powerpc/8xx: Simplify struct mmu_psize_def Christophe Leroy
2024-05-25 3:36 ` Oscar Salvador
2024-05-17 19:00 ` [RFC PATCH v2 09/20] powerpc/mm: Remove _PAGE_PSIZE Christophe Leroy
2024-05-25 3:40 ` Oscar Salvador
2024-05-17 19:00 ` [RFC PATCH v2 10/20] powerpc/mm: Fix __find_linux_pte() on 32 bits with PMD leaf entries Christophe Leroy
2024-05-25 4:12 ` Oscar Salvador
2024-05-25 6:41 ` Christophe Leroy
2024-05-17 19:00 ` [RFC PATCH v2 11/20] powerpc/mm: Complement huge_pte_alloc() for all non HUGEPD setups Christophe Leroy
2024-05-25 4:29 ` Oscar Salvador
2024-05-25 6:44 ` Christophe Leroy
2024-05-25 10:33 ` Oscar Salvador
2024-05-17 19:00 ` [RFC PATCH v2 12/20] powerpc/64e: Remove unneeded #ifdef CONFIG_PPC_E500 Christophe Leroy
2024-05-24 7:31 ` Michael Ellerman
2024-05-24 8:45 ` Christophe Leroy
2024-05-17 19:00 ` [RFC PATCH v2 13/20] powerpc/64e: Clean up impossible setups Christophe Leroy
2024-05-17 19:00 ` [RFC PATCH v2 14/20] powerpc/e500: Remove enc field from struct mmu_psize_def Christophe Leroy
2024-05-25 4:35 ` Oscar Salvador
2024-05-17 19:00 ` [RFC PATCH v2 15/20] powerpc/85xx: Switch to 64 bits PGD Christophe Leroy
2024-05-25 4:54 ` Oscar Salvador
2024-05-25 9:02 ` Christophe Leroy
2024-05-17 19:00 ` Christophe Leroy [this message]
2024-05-17 19:00 ` [RFC PATCH v2 17/20] powerpc/e500: Use contiguous PMD instead of hugepd Christophe Leroy
2024-05-17 19:00 ` [RFC PATCH v2 18/20] powerpc/64s: Use contiguous PMD/PUD instead of HUGEPD Christophe Leroy
2024-05-20 12:54 ` Nicholas Piggin
2024-05-20 16:43 ` Christophe Leroy
2024-05-22 1:13 ` Nicholas Piggin
2024-05-22 9:32 ` Christophe Leroy
2024-05-22 12:23 ` Jason Gunthorpe
2024-05-17 19:00 ` [RFC PATCH v2 19/20] powerpc/mm: Remove hugepd leftovers Christophe Leroy
2024-05-17 19:00 ` [RFC PATCH v2 20/20] mm: Remove CONFIG_ARCH_HAS_HUGEPD Christophe Leroy
2024-05-17 19:06 ` [RFC PATCH v2 00/20] Reimplement huge pages without hugepd on powerpc (8xx, e500, book3s/64) Jason Gunthorpe
2024-05-18 6:28 ` Christophe Leroy
2024-05-23 19:40 ` Peter Xu
2024-05-24 4:46 ` Michael Ellerman
2024-05-27 14:14 ` Peter Xu
2024-05-24 6:31 ` Oscar Salvador
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=f4f76cf605b84ff60cd8cb347775a8ff2338ce18.1715971869.git.christophe.leroy@csgroup.eu \
--to=christophe.leroy@csgroup.eu \
--cc=akpm@linux-foundation.org \
--cc=jgg@nvidia.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=mpe@ellerman.id.au \
--cc=npiggin@gmail.com \
--cc=osalvador@suse.de \
--cc=peterx@redhat.com \
/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
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
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 read-only IMAP folder(s) and NNTP newsgroup(s).