BMC/Intel-BMC/linux.git/arch/mips/mm/dma-default.c, branch dev

MIPS: use for_each_sg()

2015-06-21T19:54:34+00:00

This replaces the plain loop over the sglist array with for_each_sg() macro which consists of sg_next() function calls. Since MIPS doesn't select ARCH_HAS_SG_CHAIN, it is not necessary to use for_each_sg() in order to loop over each sg element. But this can help find problems with drivers that do not properly initialize their sg tables when CONFIG_DEBUG_SG is enabled. Signed-off-by: Akinobu Mita Cc: akpm@linux-foundation.org Cc: linux-mips@linux-mips.org Cc: linux-arch@vger.kernel.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/9930/ Signed-off-by: Ralf Baechle

MIPS: DMA: Implement platform hook to perform post-DMA cache flushes.

2015-04-01T15:22:01+00:00

Signed-off-by: Ralf Baechle

MIPS: DMA: Explain the lack of special handling for R14000/R16000.

2014-11-24T06:45:08+00:00

Signed-off-by: Ralf Baechle

MIPS: DMA: Add cma support

2014-09-22T11:35:52+00:00

Adds cma support to the MIPS architecture. cma uses memblock. However, mips uses bootmem. bootmem is informed about any regions reserved by memblock dma api is modified to use cma reserved memory regions when available Tested using cma_test. cma_test is a simple driver that assigns blocks of memory from cma reserved sections. Signed-off-by: Zubair Lutfullah Kakakhel Acked-by: Michal Nazarewicz Cc: catalin.marinas@arm.com Cc: will.deacon@arm.com Cc: tglx@linutronix.de Cc: mingo@redhat.com Cc: hpa@zytor.com Cc: arnd@arndb.de Cc: gregkh@linuxfoundation.org Cc: m.szyprowski@samsung.com Cc: x86@kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Cc: linux-mips@linux-mips.org Cc: linux-arch@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/7360/ Signed-off-by: Ralf Baechle

MIPS: improve checks for noncoherent DMA

2014-01-22T19:43:10+00:00

Only one MIPS development board actually supports enabling/disabling DMA coherency at runtime, so it's not a good idea to push the overhead of checking that configuration setting onto every other supported target as well. Signed-off-by: Felix Fietkau Signed-off-by: John Crispin Patchwork: http://patchwork.linux-mips.org/patch/5912/

MIPS: Remove unnecessary platform dma helper functions

2013-10-29T20:24:40+00:00

The semantics stay the same - on Cavium Octeon the functions were dead code (it overrides the MIPS DMA ops) - on other platforms they contained no code at all. Signed-off-by: Felix Fietkau Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/5720/ Signed-off-by: Ralf Baechle

MIPS: mm: Move some checks out of 'for' loop in DMA operations

2013-09-25T15:05:44+00:00

The check cpu_needs_post_dma_flush() in mips_dma_sync_sg_for_cpu() and the check !plat_device_is_coherent() in mips_dma_sync_sg_for_device() can be moved outside the for loop. As a side effect, this also avoids a GCC bug that caused kernel compile to fail with the error: arch/mips/mm/dma-default.c: In function 'mips_dma_sync_sg_for_cpu': arch/mips/mm/dma-default.c:316:1: internal compiler error: in add_insn_before, at emit-rtl.c:3852 This gcc failure is seen in Code Sourcery toolchains [e.g. gcc version 4.7.2 (Sourcery CodeBench Lite 2012.09-99)] after commit "MIPS: Optimize current_cpu_type() for better code." Signed-off-by: Jayachandran C Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/5907/ Reviewed-by: Markos Chandras Tested-by: Markos Chandras Signed-off-by: Ralf Baechle

MIPS: Optimize current_cpu_type() for better code.

2013-09-17T16:50:53+00:00

o Move current_cpu_type() to a separate header file o #ifdefing on supported CPU types lets modern GCC know that certain code in callers may be discarded ideally turning current_cpu_type() into a function returning a constant. o Use current_cpu_type() rather than direct access to struct cpuinfo_mips. Signed-off-by: Ralf Baechle Cc: Steven J. Hill Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/5833/

Merge branch '3.11-fixes' into mips-for-linux-next

2013-09-06T17:08:25+00:00

MIPS: DMA: Fix BUG due to smp_processor_id() in preemptible code

2013-09-06T17:07:11+00:00

The use of current_cpu_type() in cpu_is_noncoherent_r10000() is not preemption-safe. Use boot_cpu_type() instead to make it preemption-safe. / # insmod mtd_readtest.ko dev=4 mtd_readtest: MTD device: 4 mtd_readtest: MTD device size 996671488, eraseblock size 524288, page size 4096, count of eraseblocks 1901, pages per eraseblock 128, OOB size 224 mtd_readtest: scanning for bad eraseblocks mtd_readtest: scanned 1901 eraseblocks, 0 are bad mtd_readtest: testing page read BUG: using smp_processor_id() in preemptible [00000000] code: insmod/99 caller is mips_dma_sync_single_for_cpu+0x2c/0x128 CPU: 2 PID: 99 Comm: insmod Not tainted 3.10.4 #67 Stack : 00000006 69735f63 00000000 00000000 00000000 00000000 808273d6 00000032 80820000 00000002 8d700000 8de48fa0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 8d6afb00 8d6afb24 80721f24 807b9927 8012c130 80820000 80721f24 00000002 00000063 8de48fa0 8082333c 807b98e6 8d6afaa0 ... Call Trace: [<80109984>] show_stack+0x64/0x7c [<80666230>] dump_stack+0x20/0x2c [<803a2210>] debug_smp_processor_id+0xe0/0xf0 [<801116f0>] mips_dma_sync_single_for_cpu+0x2c/0x128 [<8043456c>] nand_plat_read_page+0x16c/0x234 [<8042fad4>] nand_do_read_ops+0x194/0x480 [<804301dc>] nand_read+0x50/0x7c [<804261c8>] part_read+0x70/0xc0 [<804231dc>] mtd_read+0x80/0xe4 [] init_module+0x354/0x6f8 [mtd_readtest] [<8010057c>] do_one_initcall+0x140/0x1a4 [<80176d7c>] load_module+0x1b5c/0x2258 [<8017752c>] SyS_init_module+0xb4/0xec [<8010f3fc>] stack_done+0x20/0x44 BUG: using smp_processor_id() in preemptible [00000000] code: insmod/99 Signed-off-by: Jerin Jacob Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/5800/ Signed-off-by: Ralf Baechle