MIPS: make CPU_HAS_LOAD_STORE_LR opt-out
CPU_HAS_LOAD_STORE_LR was introduced in 932afdeec1 ("MIPS: Add Kconfig
variable for CPUs with unaligned load/store instructions") to make code
in kernel/unaligned.c and lib/mem{cpy,set}.S more intuitive and give a
possibility to easily add new CPUs without these instruction sets in
future.
Hovewer, this variant is not optimal for mainly two reasons:
* For now, we have 20+ CPUs with such instructions and only two (MIPS R6)
without. It will obviously be more effective and straightforward to
have an option for these two rather than for the rest.
* You can easily miss the fact that you need to select this option when
adding a new CPU, while all processors lacking these sets are
well-known, so the probability of missing something is way much lower.
We can address both points by turning CPU_HAS_LOAD_STORE_LR into opt-out
CPU_NO_LOAD_STORE_LR. This also makes MIPS root Kconfig more clear and
understandable.
Signed-off-by: Alexander Lobakin <alobakin@dlink.ru>
Signed-off-by: Paul Burton <paulburton@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Microchip Linux Driver Support <UNGLinuxDriver@microchip.com>
Cc: Will Deacon <will@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Michal Simek <michal.simek@xilinx.com>
Cc: Allison Randal <allison@lohutok.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
This commit is contained in:
Alexander Lobakin
Paul Burton
parent
7de86604bb
commit
18d84e2e55
@ -1218,8 +1218,7 @@ config NO_IOPORT_MAP
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def_bool n
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config GENERIC_CSUM
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bool
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default y if !CPU_HAS_LOAD_STORE_LR
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def_bool CPU_NO_LOAD_STORE_LR
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config GENERIC_ISA_DMA
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bool
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@ -1441,7 +1440,6 @@ config CPU_LOONGSON64
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select CPU_SUPPORTS_HIGHMEM
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select CPU_SUPPORTS_HUGEPAGES
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select CPU_SUPPORTS_MSA
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select CPU_HAS_LOAD_STORE_LR
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select WEAK_ORDERING
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select WEAK_REORDERING_BEYOND_LLSC
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select MIPS_ASID_BITS_VARIABLE
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@ -1537,7 +1535,6 @@ config CPU_MIPS32_R1
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bool "MIPS32 Release 1"
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depends on SYS_HAS_CPU_MIPS32_R1
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select CPU_HAS_PREFETCH
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select CPU_HAS_LOAD_STORE_LR
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select CPU_SUPPORTS_32BIT_KERNEL
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select CPU_SUPPORTS_HIGHMEM
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help
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@ -1555,7 +1552,6 @@ config CPU_MIPS32_R2
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bool "MIPS32 Release 2"
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depends on SYS_HAS_CPU_MIPS32_R2
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select CPU_HAS_PREFETCH
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select CPU_HAS_LOAD_STORE_LR
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select CPU_SUPPORTS_32BIT_KERNEL
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select CPU_SUPPORTS_HIGHMEM
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select CPU_SUPPORTS_MSA
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@ -1571,6 +1567,7 @@ config CPU_MIPS32_R6
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bool "MIPS32 Release 6"
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depends on SYS_HAS_CPU_MIPS32_R6
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select CPU_HAS_PREFETCH
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select CPU_NO_LOAD_STORE_LR
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select CPU_SUPPORTS_32BIT_KERNEL
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select CPU_SUPPORTS_HIGHMEM
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select CPU_SUPPORTS_MSA
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@ -1586,7 +1583,6 @@ config CPU_MIPS64_R1
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bool "MIPS64 Release 1"
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depends on SYS_HAS_CPU_MIPS64_R1
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select CPU_HAS_PREFETCH
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select CPU_HAS_LOAD_STORE_LR
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select CPU_SUPPORTS_32BIT_KERNEL
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select CPU_SUPPORTS_64BIT_KERNEL
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select CPU_SUPPORTS_HIGHMEM
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@ -1606,7 +1602,6 @@ config CPU_MIPS64_R2
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bool "MIPS64 Release 2"
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depends on SYS_HAS_CPU_MIPS64_R2
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select CPU_HAS_PREFETCH
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select CPU_HAS_LOAD_STORE_LR
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select CPU_SUPPORTS_32BIT_KERNEL
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select CPU_SUPPORTS_64BIT_KERNEL
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select CPU_SUPPORTS_HIGHMEM
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@ -1624,6 +1619,7 @@ config CPU_MIPS64_R6
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bool "MIPS64 Release 6"
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depends on SYS_HAS_CPU_MIPS64_R6
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select CPU_HAS_PREFETCH
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select CPU_NO_LOAD_STORE_LR
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select CPU_SUPPORTS_32BIT_KERNEL
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select CPU_SUPPORTS_64BIT_KERNEL
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select CPU_SUPPORTS_HIGHMEM
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@ -1641,7 +1637,6 @@ config CPU_R3000
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bool "R3000"
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depends on SYS_HAS_CPU_R3000
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select CPU_HAS_WB
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select CPU_HAS_LOAD_STORE_LR
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select CPU_R3K_TLB
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select CPU_SUPPORTS_32BIT_KERNEL
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select CPU_SUPPORTS_HIGHMEM
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@ -1657,7 +1652,6 @@ config CPU_TX39XX
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bool "R39XX"
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depends on SYS_HAS_CPU_TX39XX
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select CPU_SUPPORTS_32BIT_KERNEL
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select CPU_HAS_LOAD_STORE_LR
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select CPU_R3K_TLB
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config CPU_VR41XX
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@ -1665,7 +1659,6 @@ config CPU_VR41XX
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depends on SYS_HAS_CPU_VR41XX
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select CPU_SUPPORTS_32BIT_KERNEL
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select CPU_SUPPORTS_64BIT_KERNEL
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select CPU_HAS_LOAD_STORE_LR
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help
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The options selects support for the NEC VR4100 series of processors.
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Only choose this option if you have one of these processors as a
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@ -1678,7 +1671,6 @@ config CPU_R4X00
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select CPU_SUPPORTS_32BIT_KERNEL
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select CPU_SUPPORTS_64BIT_KERNEL
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select CPU_SUPPORTS_HUGEPAGES
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select CPU_HAS_LOAD_STORE_LR
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help
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MIPS Technologies R4000-series processors other than 4300, including
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the R4000, R4400, R4600, and 4700.
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@ -1687,7 +1679,6 @@ config CPU_TX49XX
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bool "R49XX"
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depends on SYS_HAS_CPU_TX49XX
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select CPU_HAS_PREFETCH
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select CPU_HAS_LOAD_STORE_LR
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select CPU_SUPPORTS_32BIT_KERNEL
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select CPU_SUPPORTS_64BIT_KERNEL
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select CPU_SUPPORTS_HUGEPAGES
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@ -1698,7 +1689,6 @@ config CPU_R5000
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select CPU_SUPPORTS_32BIT_KERNEL
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select CPU_SUPPORTS_64BIT_KERNEL
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select CPU_SUPPORTS_HUGEPAGES
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select CPU_HAS_LOAD_STORE_LR
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help
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MIPS Technologies R5000-series processors other than the Nevada.
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@ -1708,7 +1698,6 @@ config CPU_R5500
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select CPU_SUPPORTS_32BIT_KERNEL
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select CPU_SUPPORTS_64BIT_KERNEL
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select CPU_SUPPORTS_HUGEPAGES
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select CPU_HAS_LOAD_STORE_LR
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help
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NEC VR5500 and VR5500A series processors implement 64-bit MIPS IV
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instruction set.
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@ -1719,7 +1708,6 @@ config CPU_NEVADA
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select CPU_SUPPORTS_32BIT_KERNEL
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select CPU_SUPPORTS_64BIT_KERNEL
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select CPU_SUPPORTS_HUGEPAGES
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select CPU_HAS_LOAD_STORE_LR
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help
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QED / PMC-Sierra RM52xx-series ("Nevada") processors.
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@ -1727,7 +1715,6 @@ config CPU_R10000
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bool "R10000"
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depends on SYS_HAS_CPU_R10000
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select CPU_HAS_PREFETCH
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select CPU_HAS_LOAD_STORE_LR
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select CPU_SUPPORTS_32BIT_KERNEL
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select CPU_SUPPORTS_64BIT_KERNEL
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select CPU_SUPPORTS_HIGHMEM
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@ -1739,7 +1726,6 @@ config CPU_RM7000
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bool "RM7000"
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depends on SYS_HAS_CPU_RM7000
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select CPU_HAS_PREFETCH
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select CPU_HAS_LOAD_STORE_LR
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select CPU_SUPPORTS_32BIT_KERNEL
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select CPU_SUPPORTS_64BIT_KERNEL
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select CPU_SUPPORTS_HIGHMEM
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@ -1748,7 +1734,6 @@ config CPU_RM7000
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config CPU_SB1
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bool "SB1"
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depends on SYS_HAS_CPU_SB1
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select CPU_HAS_LOAD_STORE_LR
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select CPU_SUPPORTS_32BIT_KERNEL
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select CPU_SUPPORTS_64BIT_KERNEL
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select CPU_SUPPORTS_HIGHMEM
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@ -1759,7 +1744,6 @@ config CPU_CAVIUM_OCTEON
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bool "Cavium Octeon processor"
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depends on SYS_HAS_CPU_CAVIUM_OCTEON
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select CPU_HAS_PREFETCH
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select CPU_HAS_LOAD_STORE_LR
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select CPU_SUPPORTS_64BIT_KERNEL
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select WEAK_ORDERING
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select CPU_SUPPORTS_HIGHMEM
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@ -1789,7 +1773,6 @@ config CPU_BMIPS
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select WEAK_ORDERING
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select CPU_SUPPORTS_HIGHMEM
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select CPU_HAS_PREFETCH
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select CPU_HAS_LOAD_STORE_LR
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select CPU_SUPPORTS_CPUFREQ
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select MIPS_EXTERNAL_TIMER
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help
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@ -1798,7 +1781,6 @@ config CPU_BMIPS
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config CPU_XLR
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bool "Netlogic XLR SoC"
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depends on SYS_HAS_CPU_XLR
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select CPU_HAS_LOAD_STORE_LR
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select CPU_SUPPORTS_32BIT_KERNEL
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select CPU_SUPPORTS_64BIT_KERNEL
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select CPU_SUPPORTS_HIGHMEM
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@ -1817,7 +1799,6 @@ config CPU_XLP
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select WEAK_ORDERING
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select WEAK_REORDERING_BEYOND_LLSC
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select CPU_HAS_PREFETCH
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select CPU_HAS_LOAD_STORE_LR
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select CPU_MIPSR2
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select CPU_SUPPORTS_HUGEPAGES
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select MIPS_ASID_BITS_VARIABLE
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@ -1923,14 +1904,12 @@ config CPU_LOONGSON2EF
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select CPU_SUPPORTS_HIGHMEM
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select CPU_SUPPORTS_HUGEPAGES
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select ARCH_HAS_PHYS_TO_DMA
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select CPU_HAS_LOAD_STORE_LR
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config CPU_LOONGSON32
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bool
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select CPU_MIPS32
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select CPU_MIPSR2
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select CPU_HAS_PREFETCH
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select CPU_HAS_LOAD_STORE_LR
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select CPU_SUPPORTS_32BIT_KERNEL
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select CPU_SUPPORTS_HIGHMEM
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select CPU_SUPPORTS_CPUFREQ
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@ -2573,12 +2552,13 @@ config XKS01
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config CPU_HAS_RIXI
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bool
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config CPU_HAS_LOAD_STORE_LR
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config CPU_NO_LOAD_STORE_LR
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bool
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help
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CPU has support for unaligned load and store instructions:
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CPU lacks support for unaligned load and store instructions:
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LWL, LWR, SWL, SWR (Load/store word left/right).
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LDL, LDR, SDL, SDR (Load/store doubleword left/right, for 64bit systems).
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LDL, LDR, SDL, SDR (Load/store doubleword left/right, for 64bit
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systems).
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#
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# Vectored interrupt mode is an R2 feature
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@ -131,7 +131,7 @@ do { \
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: "r" (addr), "i" (-EFAULT)); \
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} while(0)
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#ifdef CONFIG_CPU_HAS_LOAD_STORE_LR
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#ifndef CONFIG_CPU_NO_LOAD_STORE_LR
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#define _LoadW(addr, value, res, type) \
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do { \
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__asm__ __volatile__ ( \
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@ -152,7 +152,7 @@ do { \
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: "r" (addr), "i" (-EFAULT)); \
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} while(0)
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#else /* !CONFIG_CPU_HAS_LOAD_STORE_LR */
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#else /* CONFIG_CPU_NO_LOAD_STORE_LR */
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/* For CPUs without lwl instruction */
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#define _LoadW(addr, value, res, type) \
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do { \
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@ -187,7 +187,7 @@ do { \
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: "r" (addr), "i" (-EFAULT)); \
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} while(0)
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#endif /* !CONFIG_CPU_HAS_LOAD_STORE_LR */
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#endif /* CONFIG_CPU_NO_LOAD_STORE_LR */
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#define _LoadHWU(addr, value, res, type) \
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do { \
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@ -213,7 +213,7 @@ do { \
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: "r" (addr), "i" (-EFAULT)); \
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} while(0)
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#ifdef CONFIG_CPU_HAS_LOAD_STORE_LR
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#ifndef CONFIG_CPU_NO_LOAD_STORE_LR
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#define _LoadWU(addr, value, res, type) \
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do { \
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__asm__ __volatile__ ( \
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@ -256,7 +256,7 @@ do { \
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: "r" (addr), "i" (-EFAULT)); \
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} while(0)
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#else /* !CONFIG_CPU_HAS_LOAD_STORE_LR */
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#else /* CONFIG_CPU_NO_LOAD_STORE_LR */
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/* For CPUs without lwl and ldl instructions */
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#define _LoadWU(addr, value, res, type) \
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do { \
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@ -340,7 +340,7 @@ do { \
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: "r" (addr), "i" (-EFAULT)); \
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} while(0)
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#endif /* !CONFIG_CPU_HAS_LOAD_STORE_LR */
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#endif /* CONFIG_CPU_NO_LOAD_STORE_LR */
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#define _StoreHW(addr, value, res, type) \
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@ -366,7 +366,7 @@ do { \
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: "r" (value), "r" (addr), "i" (-EFAULT));\
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} while(0)
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#ifdef CONFIG_CPU_HAS_LOAD_STORE_LR
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#ifndef CONFIG_CPU_NO_LOAD_STORE_LR
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#define _StoreW(addr, value, res, type) \
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do { \
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__asm__ __volatile__ ( \
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@ -407,7 +407,7 @@ do { \
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: "r" (value), "r" (addr), "i" (-EFAULT)); \
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} while(0)
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#else /* !CONFIG_CPU_HAS_LOAD_STORE_LR */
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#else /* CONFIG_CPU_NO_LOAD_STORE_LR */
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#define _StoreW(addr, value, res, type) \
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do { \
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__asm__ __volatile__ ( \
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@ -483,7 +483,7 @@ do { \
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: "memory"); \
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} while(0)
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#endif /* !CONFIG_CPU_HAS_LOAD_STORE_LR */
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#endif /* CONFIG_CPU_NO_LOAD_STORE_LR */
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#else /* __BIG_ENDIAN */
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@ -509,7 +509,7 @@ do { \
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: "r" (addr), "i" (-EFAULT)); \
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} while(0)
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#ifdef CONFIG_CPU_HAS_LOAD_STORE_LR
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#ifndef CONFIG_CPU_NO_LOAD_STORE_LR
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#define _LoadW(addr, value, res, type) \
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do { \
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__asm__ __volatile__ ( \
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@ -530,7 +530,7 @@ do { \
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: "r" (addr), "i" (-EFAULT)); \
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} while(0)
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#else /* !CONFIG_CPU_HAS_LOAD_STORE_LR */
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#else /* CONFIG_CPU_NO_LOAD_STORE_LR */
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/* For CPUs without lwl instruction */
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#define _LoadW(addr, value, res, type) \
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do { \
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@ -565,7 +565,7 @@ do { \
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: "r" (addr), "i" (-EFAULT)); \
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} while(0)
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#endif /* !CONFIG_CPU_HAS_LOAD_STORE_LR */
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#endif /* CONFIG_CPU_NO_LOAD_STORE_LR */
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#define _LoadHWU(addr, value, res, type) \
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@ -592,7 +592,7 @@ do { \
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: "r" (addr), "i" (-EFAULT)); \
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} while(0)
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#ifdef CONFIG_CPU_HAS_LOAD_STORE_LR
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#ifndef CONFIG_CPU_NO_LOAD_STORE_LR
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#define _LoadWU(addr, value, res, type) \
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do { \
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__asm__ __volatile__ ( \
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@ -635,7 +635,7 @@ do { \
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: "r" (addr), "i" (-EFAULT)); \
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} while(0)
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#else /* !CONFIG_CPU_HAS_LOAD_STORE_LR */
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#else /* CONFIG_CPU_NO_LOAD_STORE_LR */
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/* For CPUs without lwl and ldl instructions */
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#define _LoadWU(addr, value, res, type) \
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do { \
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@ -718,7 +718,7 @@ do { \
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: "=&r" (value), "=r" (res) \
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: "r" (addr), "i" (-EFAULT)); \
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} while(0)
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#endif /* !CONFIG_CPU_HAS_LOAD_STORE_LR */
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#endif /* CONFIG_CPU_NO_LOAD_STORE_LR */
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#define _StoreHW(addr, value, res, type) \
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do { \
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@ -743,7 +743,7 @@ do { \
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: "r" (value), "r" (addr), "i" (-EFAULT));\
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} while(0)
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#ifdef CONFIG_CPU_HAS_LOAD_STORE_LR
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#ifndef CONFIG_CPU_NO_LOAD_STORE_LR
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#define _StoreW(addr, value, res, type) \
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do { \
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__asm__ __volatile__ ( \
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@ -784,7 +784,7 @@ do { \
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: "r" (value), "r" (addr), "i" (-EFAULT)); \
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} while(0)
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#else /* !CONFIG_CPU_HAS_LOAD_STORE_LR */
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#else /* CONFIG_CPU_NO_LOAD_STORE_LR */
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/* For CPUs without swl and sdl instructions */
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#define _StoreW(addr, value, res, type) \
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do { \
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@ -861,7 +861,7 @@ do { \
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: "memory"); \
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} while(0)
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#endif /* !CONFIG_CPU_HAS_LOAD_STORE_LR */
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#endif /* CONFIG_CPU_NO_LOAD_STORE_LR */
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#endif
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#define LoadHWU(addr, value, res) _LoadHWU(addr, value, res, kernel)
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@ -301,14 +301,14 @@
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and t0, src, ADDRMASK
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PREFS( 0, 2*32(src) )
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PREFD( 1, 2*32(dst) )
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#ifdef CONFIG_CPU_HAS_LOAD_STORE_LR
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#ifndef CONFIG_CPU_NO_LOAD_STORE_LR
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bnez t1, .Ldst_unaligned\@
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nop
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bnez t0, .Lsrc_unaligned_dst_aligned\@
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#else
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#else /* CONFIG_CPU_NO_LOAD_STORE_LR */
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or t0, t0, t1
|
||||
bnez t0, .Lcopy_unaligned_bytes\@
|
||||
#endif
|
||||
#endif /* CONFIG_CPU_NO_LOAD_STORE_LR */
|
||||
/*
|
||||
* use delay slot for fall-through
|
||||
* src and dst are aligned; need to compute rem
|
||||
@ -389,7 +389,7 @@
|
||||
bne rem, len, 1b
|
||||
.set noreorder
|
||||
|
||||
#ifdef CONFIG_CPU_HAS_LOAD_STORE_LR
|
||||
#ifndef CONFIG_CPU_NO_LOAD_STORE_LR
|
||||
/*
|
||||
* src and dst are aligned, need to copy rem bytes (rem < NBYTES)
|
||||
* A loop would do only a byte at a time with possible branch
|
||||
@ -491,7 +491,7 @@
|
||||
bne len, rem, 1b
|
||||
.set noreorder
|
||||
|
||||
#endif /* CONFIG_CPU_HAS_LOAD_STORE_LR */
|
||||
#endif /* !CONFIG_CPU_NO_LOAD_STORE_LR */
|
||||
.Lcopy_bytes_checklen\@:
|
||||
beqz len, .Ldone\@
|
||||
nop
|
||||
@ -520,7 +520,7 @@
|
||||
jr ra
|
||||
nop
|
||||
|
||||
#ifndef CONFIG_CPU_HAS_LOAD_STORE_LR
|
||||
#ifdef CONFIG_CPU_NO_LOAD_STORE_LR
|
||||
.Lcopy_unaligned_bytes\@:
|
||||
1:
|
||||
COPY_BYTE(0)
|
||||
@ -534,7 +534,7 @@
|
||||
ADD src, src, 8
|
||||
b 1b
|
||||
ADD dst, dst, 8
|
||||
#endif /* !CONFIG_CPU_HAS_LOAD_STORE_LR */
|
||||
#endif /* CONFIG_CPU_NO_LOAD_STORE_LR */
|
||||
.if __memcpy == 1
|
||||
END(memcpy)
|
||||
.set __memcpy, 0
|
||||
|
||||
@ -115,7 +115,7 @@
|
||||
#endif
|
||||
.set reorder
|
||||
|
||||
#ifdef CONFIG_CPU_HAS_LOAD_STORE_LR
|
||||
#ifndef CONFIG_CPU_NO_LOAD_STORE_LR
|
||||
R10KCBARRIER(0(ra))
|
||||
#ifdef __MIPSEB__
|
||||
EX(LONG_S_L, a1, (a0), .Lfirst_fixup\@) /* make word/dword aligned */
|
||||
@ -125,7 +125,7 @@
|
||||
PTR_SUBU a0, t0 /* long align ptr */
|
||||
PTR_ADDU a2, t0 /* correct size */
|
||||
|
||||
#else /* !CONFIG_CPU_HAS_LOAD_STORE_LR */
|
||||
#else /* CONFIG_CPU_NO_LOAD_STORE_LR */
|
||||
#define STORE_BYTE(N) \
|
||||
EX(sb, a1, N(a0), .Lbyte_fixup\@); \
|
||||
.set noreorder; \
|
||||
@ -150,7 +150,7 @@
|
||||
ori a0, STORMASK
|
||||
xori a0, STORMASK
|
||||
PTR_ADDIU a0, STORSIZE
|
||||
#endif /* !CONFIG_CPU_HAS_LOAD_STORE_LR */
|
||||
#endif /* CONFIG_CPU_NO_LOAD_STORE_LR */
|
||||
1: ori t1, a2, 0x3f /* # of full blocks */
|
||||
xori t1, 0x3f
|
||||
andi t0, a2, 0x40-STORSIZE
|
||||
@ -185,7 +185,7 @@
|
||||
|
||||
.set noreorder
|
||||
beqz a2, 1f
|
||||
#ifdef CONFIG_CPU_HAS_LOAD_STORE_LR
|
||||
#ifndef CONFIG_CPU_NO_LOAD_STORE_LR
|
||||
PTR_ADDU a0, a2 /* What's left */
|
||||
.set reorder
|
||||
R10KCBARRIER(0(ra))
|
||||
@ -194,7 +194,7 @@
|
||||
#else
|
||||
EX(LONG_S_L, a1, -1(a0), .Llast_fixup\@)
|
||||
#endif
|
||||
#else
|
||||
#else /* CONFIG_CPU_NO_LOAD_STORE_LR */
|
||||
PTR_SUBU t0, $0, a2
|
||||
.set reorder
|
||||
move a2, zero /* No remaining longs */
|
||||
@ -211,7 +211,7 @@
|
||||
EX(sb, a1, 6(a0), .Lbyte_fixup\@)
|
||||
#endif
|
||||
0:
|
||||
#endif
|
||||
#endif /* CONFIG_CPU_NO_LOAD_STORE_LR */
|
||||
1: move a2, zero
|
||||
jr ra
|
||||
|
||||
@ -234,7 +234,7 @@
|
||||
.hidden __memset
|
||||
.endif
|
||||
|
||||
#ifndef CONFIG_CPU_HAS_LOAD_STORE_LR
|
||||
#ifdef CONFIG_CPU_NO_LOAD_STORE_LR
|
||||
.Lbyte_fixup\@:
|
||||
/*
|
||||
* unset_bytes = (#bytes - (#unaligned bytes)) - (-#unaligned bytes remaining + 1) + 1
|
||||
@ -243,7 +243,7 @@
|
||||
PTR_SUBU a2, t0
|
||||
PTR_ADDIU a2, 1
|
||||
jr ra
|
||||
#endif /* !CONFIG_CPU_HAS_LOAD_STORE_LR */
|
||||
#endif /* CONFIG_CPU_NO_LOAD_STORE_LR */
|
||||
|
||||
.Lfirst_fixup\@:
|
||||
/* unset_bytes already in a2 */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user