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Message-Id: <20240827-patches-below_hint_mmap-v1-6-46ff2eb9022d@rivosinc.com>
Date: Tue, 27 Aug 2024 22:49:12 -0700
From: Charlie Jenkins <charlie@...osinc.com>
To: Arnd Bergmann <arnd@...db.de>, Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
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Andrew Morton <akpm@...ux-foundation.org>,
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Cc: linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
Palmer Dabbelt <palmer@...osinc.com>, linux-riscv@...ts.infradead.org,
linux-arm-kernel@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org,
linux-mm@...ck.org, loongarch@...ts.linux.dev, linux-mips@...r.kernel.org,
linux-parisc@...r.kernel.org, linux-s390@...r.kernel.org,
linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
linux-kselftest@...r.kernel.org, Charlie Jenkins <charlie@...osinc.com>
Subject: [PATCH 06/16] arm64: mm: Support MAP_BELOW_HINT
Add support for MAP_BELOW_HINT to arch_get_mmap_base() and
arch_get_mmap_end().
Signed-off-by: Charlie Jenkins <charlie@...osinc.com>
---
arch/arm64/include/asm/processor.h | 34 +++++++++++++++++++++++++++++-----
1 file changed, 29 insertions(+), 5 deletions(-)
diff --git a/arch/arm64/include/asm/processor.h b/arch/arm64/include/asm/processor.h
index a67ca119bb91..39aabb1619f6 100644
--- a/arch/arm64/include/asm/processor.h
+++ b/arch/arm64/include/asm/processor.h
@@ -92,12 +92,36 @@
#endif /* CONFIG_COMPAT */
#ifndef CONFIG_ARM64_FORCE_52BIT
-#define arch_get_mmap_end(addr, len, flags) \
- (((addr) > DEFAULT_MAP_WINDOW) ? TASK_SIZE : DEFAULT_MAP_WINDOW)
+#define arch_get_mmap_end(addr, len, flags) \
+({ \
+ unsigned long mmap_end; \
+ typeof(flags) _flags = (flags); \
+ typeof(addr) _addr = (addr); \
+ typeof(len) _len = (len); \
+ if (_flags & MAP_BELOW_HINT && _addr != 0 && ((_addr + _len) > BIT(VA_BITS - 1))) \
+ mmap_end = (_addr + _len); \
+ else \
+ mmap_end = ((_addr > DEFAULT_MAP_WINDOW) ? TASK_SIZE : DEFAULT_MAP_WINDOW); \
+ mmap_end \
+})
+
+#define arch_get_mmap_base(addr, len, base, flags) \
+({ \
+ unsigned long mmap_base; \
+ typeof(flags) _flags = (flags); \
+ typeof(addr) _addr = (addr); \
+ typeof(base) _base = (base); \
+ typeof(len) _len = (len); \
+ unsigned long rnd_gap = DEFAULT_MAP_WINDOW - (_base); \
+ if (_flags & MAP_BELOW_HINT && _addr != 0 && ((_addr + _len) > BIT(VA_BITS - 1)))\
+ mmap_base = (_addr + _len) - rnd_gap; \
+ else \
+ mmap_end = ((_addr > DEFAULT_MAP_WINDOW) ? \
+ _base + TASK_SIZE - DEFAULT_MAP_WINDOW : \
+ _base); \
+ mmap_end \
+})
-#define arch_get_mmap_base(addr, len, base, flags) ((addr > DEFAULT_MAP_WINDOW) ? \
- base + TASK_SIZE - DEFAULT_MAP_WINDOW :\
- base)
#endif /* CONFIG_ARM64_FORCE_52BIT */
extern phys_addr_t arm64_dma_phys_limit;
--
2.45.0
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