linux-kernel - [PATCH mm-unstable 15/17] mm: powerpc: Introduce arch_mmap

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Message-ID: <20241210024119.2488608-16-kaleshsingh@google.com>
Date: Mon,  9 Dec 2024 18:41:17 -0800
From: Kalesh Singh <kaleshsingh@...gle.com>
To: akpm@...ux-foundation.org, vbabka@...e.cz, yang@...amperecomputing.com, 
	riel@...riel.com, david@...hat.com
Cc: linux@...linux.org.uk, tsbogend@...ha.franken.de, 
	James.Bottomley@...senPartnership.com, ysato@...rs.sourceforge.jp, 
	dalias@...c.org, glaubitz@...sik.fu-berlin.de, davem@...emloft.net, 
	andreas@...sler.com, tglx@...utronix.de, bp@...en8.de, 
	dave.hansen@...ux.intel.com, x86@...nel.org, chris@...kel.net, 
	jcmvbkbc@...il.com, bhelgaas@...gle.com, jason.andryuk@....com, 
	leitao@...ian.org, linux-alpha@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-snps-arc@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org, 
	linux-csky@...r.kernel.org, loongarch@...ts.linux.dev, 
	linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org, 
	linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org, 
	linux-sh@...r.kernel.org, sparclinux@...r.kernel.org, linux-mm@...ck.org, 
	kernel-team@...roid.com, android-mm@...gle.com, 
	Kalesh Singh <kaleshsingh@...gle.com>
Subject: [PATCH mm-unstable 15/17] mm: powerpc: Introduce arch_mmap_hint()

Introduce powerpc arch_mmap_hint() and define HAVE_ARCH_MMAP_HINT.
This is a preparatory patch, no functional change is introduced.

Signed-off-by: Kalesh Singh <kaleshsingh@...gle.com>
---
 arch/powerpc/include/asm/book3s/64/slice.h |  1 +
 arch/powerpc/mm/book3s64/slice.c           | 31 ++++++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/arch/powerpc/include/asm/book3s/64/slice.h b/arch/powerpc/include/asm/book3s/64/slice.h
index 5fbe18544cbd..89f629080e90 100644
--- a/arch/powerpc/include/asm/book3s/64/slice.h
+++ b/arch/powerpc/include/asm/book3s/64/slice.h
@@ -10,6 +10,7 @@
 #endif
 #define HAVE_ARCH_UNMAPPED_AREA
 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
+#define HAVE_ARCH_MMAP_HINT
 #endif
 
 #define SLICE_LOW_SHIFT		28
diff --git a/arch/powerpc/mm/book3s64/slice.c b/arch/powerpc/mm/book3s64/slice.c
index bc9a39821d1c..70b95968301a 100644
--- a/arch/powerpc/mm/book3s64/slice.c
+++ b/arch/powerpc/mm/book3s64/slice.c
@@ -647,6 +647,37 @@ static int file_to_psize(struct file *file)
 }
 #endif
 
+static unsigned long slice_mmap_hint(unsigned long addr, unsigned long len,
+				     unsigned long flags, unsigned int psize)
+{
+	unsigned long hint_addr = slice_get_unmapped_area(addr, len, flags, psize, 0);
+
+	if (IS_ERR_VALUE(hint_addr) || hint_addr != PAGE_ALIGN(addr))
+		return 0;
+
+	return hint_addr;
+}
+
+unsigned long arch_mmap_hint(struct file *filp, unsigned long addr,
+			     unsigned long len, unsigned long pgoff,
+			     unsigned long flags)
+{
+	unsigned int psize;
+
+	if (!addr)
+		return 0;
+
+	if (radix_enabled())
+		return generic_mmap_hint(filp, addr, len, pgoff, flags);
+
+	if (filp && is_file_hugepages(filp))
+		psize = file_to_psize(filp);
+	else
+		psize = mm_ctx_user_psize(&current->mm->context);
+
+	return slice_mmap_hint(addr, len, flags, psize);
+}
+
 unsigned long arch_get_unmapped_area(struct file *filp,
 				     unsigned long addr,
 				     unsigned long len,
-- 
2.47.0.338.g60cca15819-goog