From: Logan Gunthorpe <logang@deltatee•com>
To: linux-kernel@vger•kernel.org,
linux-arm-kernel@lists•infradead.org, linux-ia64@vger•kernel.org,
linuxppc-dev@lists•ozlabs.org, linux-s390@vger•kernel.org,
linux-sh@vger•kernel.org, platform-driver-x86@vger•kernel.org,
linux-mm@kvack•org, Dan Williams <dan.j.williams@intel•com>,
Michal Hocko <mhocko@kernel•org>,
David Hildenbrand <david@redhat•com>,
Andrew Morton <akpm@linux-foundation•org>
Cc: Eric Badger <ebadger@gigaio•com>,
"H. Peter Anvin" <hpa@zytor•com>,
Peter Zijlstra <peterz@infradead•org>,
Catalin Marinas <catalin.marinas@arm•com>,
Dave Hansen <dave.hansen@linux•intel.com>,
x86@kernel•org, Logan Gunthorpe <logang@deltatee•com>,
Ingo Molnar <mingo@redhat•com>, Borislav Petkov <bp@alien8•de>,
Andy Lutomirski <luto@kernel•org>,
Benjamin Herrenschmidt <benh@kernel•crashing.org>,
Thomas Gleixner <tglx@linutronix•de>,
Will Deacon <will@kernel•org>, Christoph Hellwig <hch@lst•de>
Subject: [PATCH v4 4/7] x86/mm: Introduce __set_memory_prot()
Date: Fri, 6 Mar 2020 10:08:43 -0700 [thread overview]
Message-ID: <20200306170846.9333-5-logang@deltatee.com> (raw)
In-Reply-To: <20200306170846.9333-1-logang@deltatee.com>
For use in the 32bit arch_add_memory() to set the pgprot type of the
memory to add.
Cc: Thomas Gleixner <tglx@linutronix•de>
Cc: Ingo Molnar <mingo@redhat•com>
Cc: Borislav Petkov <bp@alien8•de>
Cc: "H. Peter Anvin" <hpa@zytor•com>
Cc: x86@kernel•org
Cc: Dave Hansen <dave.hansen@linux•intel.com>
Cc: Andy Lutomirski <luto@kernel•org>
Cc: Peter Zijlstra <peterz@infradead•org>
Signed-off-by: Logan Gunthorpe <logang@deltatee•com>
Reviewed-by: Dan Williams <dan.j.williams@intel•com>
---
arch/x86/include/asm/set_memory.h | 1 +
arch/x86/mm/pat/set_memory.c | 13 +++++++++++++
2 files changed, 14 insertions(+)
diff --git a/arch/x86/include/asm/set_memory.h b/arch/x86/include/asm/set_memory.h
index 64c3dce374e5..034358da4837 100644
--- a/arch/x86/include/asm/set_memory.h
+++ b/arch/x86/include/asm/set_memory.h
@@ -34,6 +34,7 @@
* The caller is required to take care of these.
*/
+int __set_memory_prot(unsigned long addr, int numpages, pgprot_t prot);
int _set_memory_uc(unsigned long addr, int numpages);
int _set_memory_wc(unsigned long addr, int numpages);
int _set_memory_wt(unsigned long addr, int numpages);
diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c
index c4aedd00c1ba..a7b14dffeb0b 100644
--- a/arch/x86/mm/pat/set_memory.c
+++ b/arch/x86/mm/pat/set_memory.c
@@ -1792,6 +1792,19 @@ static inline int cpa_clear_pages_array(struct page **pages, int numpages,
CPA_PAGES_ARRAY, pages);
}
+/*
+ * _set_memory_prot is an internal helper for callers that have been passed
+ * a pgprot_t value from upper layers and a reservation has already been taken.
+ * If you want to set the pgprot to a specific page protocol, use the
+ * set_memory_xx() functions.
+ */
+int __set_memory_prot(unsigned long addr, int numpages, pgprot_t prot)
+{
+ return change_page_attr_set_clr(&addr, numpages, prot,
+ __pgprot(~pgprot_val(prot)), 0, 0,
+ NULL);
+}
+
int _set_memory_uc(unsigned long addr, int numpages)
{
/*
--
2.20.1
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next prev parent reply other threads:[~2020-03-06 17:09 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-06 17:08 [PATCH v4 0/7] Allow setting caching mode in arch_add_memory() for P2PDMA Logan Gunthorpe
2020-03-06 17:08 ` [PATCH v4 1/7] mm/memory_hotplug: Drop the flags field from struct mhp_restrictions Logan Gunthorpe
2020-03-06 17:08 ` [PATCH v4 2/7] mm/memory_hotplug: Rename mhp_restrictions to mhp_params Logan Gunthorpe
2020-03-06 17:08 ` [PATCH v4 3/7] x86/mm: Thread pgprot_t through init_memory_mapping() Logan Gunthorpe
2020-03-06 17:08 ` Logan Gunthorpe [this message]
2020-03-06 17:08 ` [PATCH v4 5/7] powerpc/mm: Thread pgprot_t through create_section_mapping() Logan Gunthorpe
2020-03-06 17:08 ` [PATCH v4 6/7] mm/memory_hotplug: Add pgprot_t to mhp_params Logan Gunthorpe
2020-03-06 17:08 ` [PATCH v4 7/7] mm/memremap: Set caching mode for PCI P2PDMA memory to WC Logan Gunthorpe
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