Alexey Brodkin b607eddd71 ARCv2: guard SLC DMA ops with spinlock ... SLC maintenance ops need to be serialized by software as there is no inherent buffering / quequing of aux commands. It can silently ignore a new aux operation if previous one is still ongoing (SLC_CTRL_BUSY) So gaurd the SLC op using a spin lock The spin lock doesn't seem to be contended even in heavy workloads such as iperf. On FPGA @ 75 MHz. [1] Before this change: ============================================================ # iperf -c 10.42.0.1 ------------------------------------------------------------ Client connecting to 10.42.0.1, TCP port 5001 TCP window size: 43.8 KByte (default) ------------------------------------------------------------ [ 3] local 10.42.0.110 port 38935 connected with 10.42.0.1 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 48.4 MBytes 40.6 Mbits/sec ============================================================ [2] After this change: ============================================================ # iperf -c 10.42.0.1 ------------------------------------------------------------ Client connecting to 10.42.0.1, TCP port 5001 TCP window size: 43.8 KByte (default) ------------------------------------------------------------ [ 3] local 10.42.0.243 port 60248 connected with 10.42.0.1 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 47.5 MBytes 39.8 Mbits/sec # iperf -c 10.42.0.1 ------------------------------------------------------------ Client connecting to 10.42.0.1, TCP port 5001 TCP window size: 43.8 KByte (default) ------------------------------------------------------------ [ 3] local 10.42.0.243 port 60249 connected with 10.42.0.1 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 54.9 MBytes 46.0 Mbits/sec ============================================================ Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Cc: arc-linux-dev@synopsys.com Signed-off-by: Vineet Gupta <vgupta@synopsys.com>		2015-07-06 10:12:39 +05:30
..
cache.c	ARCv2: guard SLC DMA ops with spinlock	2015-07-06 10:12:39 +05:30
dma.c	ARCv2: SLC: Handle explcit flush for DMA ops (w/o IO-coherency)	2015-06-25 06:00:19 +05:30
extable.c	ARC: Fix coding style issues	2013-04-09 12:21:14 +05:30
fault.c	mm/fault, arch: Use pagefault_disable() to check for disabled pagefaults in the handler	2015-05-19 08:39:15 +02:00
init.c	ARC: mem init spring cleaning - No functional changes	2015-04-13 15:16:29 +05:30
ioremap.c	ARC: Use <linux/*> headers instead of <asm/*>	2013-04-09 12:21:14 +05:30
Makefile	ARC: mm/cache_arc700.c -> mm/cache.c	2015-06-19 18:09:32 +05:30
mmap.c	ARC: [mm] Aliasing VIPT dcache support 4/4	2013-05-09 22:00:57 +05:30
tlb.c	ARCv2: MMUv4: TLB programming Model changes	2015-06-22 14:06:55 +05:30
tlbex.S	ARCv2: [vdk] dts files and defconfig for HS38 VDK	2015-06-25 06:00:21 +05:30