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Contributor
Contributor
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Registered: ‎04-06-2018

failed to dma_alloc_coherent when install driver

Hello everyone,

I am trying to run a device driver from luscher (developer) to work with DMA in direct mode.

I have edited the Kernel to allow CMA , I even set 60 MB and recently I edited the device tree to reserve memory , device tree file is attached and the driver. the DMESG is bellow.

Is there any trick for CMA that I am missing ?

Booting Linux on physical CPU 0x0
Linux version 4.14.0-xilinx-v2018.2 (oe-user@oe-host) (gcc version 7.2.0 (GCC)) #18 SMP PREEMPT Sun Feb 17 02:28:44 PST 2019
CPU: ARMv7 Processor [413fc090] revision 0 (ARMv7), cr=18c5387d
CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
OF: fdt: Machine model: xlnx,zynq-7000
bootconsole [earlycon0] enabled
Memory policy: Data cache writealloc
OF: fdt: Reserved memory: unsupported node format, ignoring
cma: dma_contiguous_reserve(limit ffffffff)
cma: dma_contiguous_reserve: reserving 60 MiB for global area
cma: cma_declare_contiguous(size 0x03c00000, base 0x00000000, limit 0xffffffff alignment 0x00000000)
cma: Reserved 60 MiB at 0x3c400000
On node 0 totalpages: 262144
free_area_init_node: node 0, pgdat c183aec0, node_mem_map ef7f7000
  Normal zone: 1536 pages used for memmap
  Normal zone: 0 pages reserved
  Normal zone: 196608 pages, LIFO batch:31
  HighMem zone: 65536 pages, LIFO batch:15
percpu: Embedded 16 pages/cpu @ef7ce000 s34764 r8192 d22580 u65536
pcpu-alloc: s34764 r8192 d22580 u65536 alloc=16*4096
pcpu-alloc: [0] 0 [0] 1
Built 1 zonelists, mobility grouping on.  Total pages: 260608
Kernel command line: console=ttyPS0,115200 earlyprintk
PID hash table entries: 4096 (order: 2, 16384 bytes)
Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
Memory: 953492K/1048576K available (6144K kernel code, 238K rwdata, 1568K rodata, 15360K init, 153K bss, 33644K reserved, 61440K cma-reserved, 200704K highmem)
Virtual kernel memory layout:
    vector  : 0xffff0000 - 0xffff1000   (   4 kB)
    fixmap  : 0xffc00000 - 0xfff00000   (3072 kB)
    vmalloc : 0xf0800000 - 0xff800000   ( 240 MB)
    lowmem  : 0xc0000000 - 0xf0000000   ( 768 MB)
    pkmap   : 0xbfe00000 - 0xc0000000   (   2 MB)
    modules : 0xbf000000 - 0xbfe00000   (  14 MB)
      .text : 0xc0008000 - 0xc0700000   (7136 kB)
      .init : 0xc0900000 - 0xc1800000   (15360 kB)
      .data : 0xc1800000 - 0xc183bac0   ( 239 kB)
       .bss : 0xc183bac0 - 0xc1862144   ( 154 kB)
Preemptible hierarchical RCU implementation.
    RCU restricting CPUs from NR_CPUS=4 to nr_cpu_ids=2.
    Tasks RCU enabled.
RCU: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=2
NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
efuse mapped to f0802000
slcr mapped to f0804000
L2C: platform modifies aux control register: 0x72360000 -> 0x72760000
L2C: DT/platform modifies aux control register: 0x72360000 -> 0x72760000
L2C-310 erratum 769419 enabled
L2C-310 enabling early BRESP for Cortex-A9
L2C-310 full line of zeros enabled for Cortex-A9
L2C-310 ID prefetch enabled, offset 1 lines
L2C-310 dynamic clock gating enabled, standby mode enabled
L2C-310 cache controller enabled, 8 ways, 512 kB
L2C-310: CACHE_ID 0x410000c8, AUX_CTRL 0x76760001
zynq_clock_init: clkc starts at f0804100
Zynq clock init
sched_clock: 64 bits at 249MHz, resolution 4ns, wraps every 4398046511102ns
clocksource: arm_global_timer: mask: 0xffffffffffffffff max_cycles: 0x7350b89c29, max_idle_ns: 881590431910 ns
Switching to timer-based delay loop, resolution 4ns
clocksource: ttc_clocksource: mask: 0xffff max_cycles: 0xffff, max_idle_ns: 716713566 ns
timer #0 at f080c000, irq=17
Console: colour dummy device 80x30
Calibrating delay loop (skipped), value calculated using timer frequency.. 499.99 BogoMIPS (lpj=2499999)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 2048 (order: 1, 8192 bytes)
Mountpoint-cache hash table entries: 2048 (order: 1, 8192 bytes)
CPU: Testing write buffer coherency: ok
CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
Setting up static identity map for 0x100000 - 0x100060
Hierarchical SRCU implementation.
smp: Bringing up secondary CPUs ...
CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
smp: Brought up 1 node, 2 CPUs
SMP: Total of 2 processors activated (999.99 BogoMIPS).
CPU: All CPU(s) started in SVC mode.
devtmpfs: initialized
random: get_random_u32 called from bucket_table_alloc+0x1c4/0x204 with crng_init=0
VFP support v0.3: implementor 41 architecture 3 part 30 variant 9 rev 4
clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
futex hash table entries: 512 (order: 3, 32768 bytes)
pinctrl core: initialized pinctrl subsystem
random: fast init done
NET: Registered protocol family 16
cma: cma_alloc(cma c184d360, count 64, align 6)
cma: cma_alloc(): returned eff7f000
DMA: preallocated 256 KiB pool for atomic coherent allocations
cpuidle: using governor menu
hw-breakpoint: found 5 (+1 reserved) breakpoint and 1 watchpoint registers.
hw-breakpoint: maximum watchpoint size is 4 bytes.
zynq-ocm f800c000.ocmc: ZYNQ OCM pool: 256 KiB @ 0xf0880000
zynq-pinctrl 700.pinctrl: zynq pinctrl initialized
e0001000.serial: ttyPS0 at MMIO 0xe0001000 (irq = 28, base_baud = 6249999) is a xuartps
console [ttyPS0] enabled
bootconsole [earlycon0] disabled
vgaarb: loaded
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
media: Linux media interface: v0.10
Linux video capture interface: v2.00
pps_core: LinuxPPS API ver. 1 registered
pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
PTP clock support registered
EDAC MC: Ver: 3.0.0
FPGA manager framework
fpga-region fpga-full: FPGA Region probed
Advanced Linux Sound Architecture Driver Initialized.
clocksource: Switched to clocksource arm_global_timer
NET: Registered protocol family 2
TCP established hash table entries: 8192 (order: 3, 32768 bytes)
TCP bind hash table entries: 8192 (order: 4, 65536 bytes)
TCP: Hash tables configured (established 8192 bind 8192)
UDP hash table entries: 512 (order: 2, 16384 bytes)
UDP-Lite hash table entries: 512 (order: 2, 16384 bytes)
NET: Registered protocol family 1
RPC: Registered named UNIX socket transport module.
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
PCI: CLS 0 bytes, default 64
hw perfevents: no interrupt-affinity property for /pmu@f8891000, guessing.
hw perfevents: enabled with armv7_cortex_a9 PMU driver, 7 counters available
workingset: timestamp_bits=30 max_order=18 bucket_order=0
jffs2: version 2.2. (NAND) (SUMMARY)  © 2001-2006 Red Hat, Inc.
bounce: pool size: 64 pages
io scheduler noop registered
io scheduler deadline registered
io scheduler cfq registered (default)
io scheduler mq-deadline registered
io scheduler kyber registered
cma: cma_alloc(cma c184d360, count 1, align 0)
cma: cma_alloc(): returned eff7f800
dma-pl330 f8003000.dmac: Loaded driver for PL330 DMAC-241330
dma-pl330 f8003000.dmac:     DBUFF-128x8bytes Num_Chans-8 Num_Peri-4 Num_Events-16
brd: module loaded
loop: module loaded
m25p80 spi0.0: found s25fl128s, expected n25q512a
m25p80 spi0.0: s25fl128s (16384 Kbytes)
4 ofpart partitions found on MTD device spi0.0
Creating 4 MTD partitions on "spi0.0":
0x000000000000-0x000000500000 : "boot"
0x000000500000-0x000000520000 : "bootenv"
0x000000520000-0x000000fa0000 : "kernel"
0x000000fa0000-0x000001000000 : "spare"
libphy: Fixed MDIO Bus: probed
CAN device driver interface
libphy: MACB_mii_bus: probed
macb e000b000.ethernet eth0: Cadence GEM rev 0x00020118 at 0xe000b000 irq 30 (00:0a:35:00:1e:53)
Generic PHY e000b000.ethernet-ffffffff:03: attached PHY driver [Generic PHY] (mii_bus:phy_addr=e000b000.ethernet-ffffffff:03, irq=POLL)
e1000e: Intel(R) PRO/1000 Network Driver - 3.2.6-k
e1000e: Copyright(c) 1999 - 2015 Intel Corporation.
ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
ehci-pci: EHCI PCI platform driver
usbcore: registered new interface driver usb-storage
i2c /dev entries driver
cdns-i2c e0004000.i2c: 400 kHz mmio e0004000 irq 24
cdns-i2c e0005000.i2c: 400 kHz mmio e0005000 irq 25
IR NEC protocol handler initialized
IR RC5(x/sz) protocol handler initialized
IR RC6 protocol handler initialized
IR JVC protocol handler initialized
IR Sony protocol handler initialized
IR SANYO protocol handler initialized
IR Sharp protocol handler initialized
IR MCE Keyboard/mouse protocol handler initialized
IR XMP protocol handler initialized
cdns-wdt f8005000.watchdog: Xilinx Watchdog Timer at f098c000 with timeout 10s
EDAC MC: ECC not enabled
Xilinx Zynq CpuIdle Driver started
sdhci: Secure Digital Host Controller Interface driver
sdhci: Copyright(c) Pierre Ossman
sdhci-pltfm: SDHCI platform and OF driver helper
cma: cma_alloc(cma c184d360, count 1, align 0)
cma: cma_alloc(): returned eff7f820
mmc0: SDHCI controller on e0100000.sdhci [e0100000.sdhci] using ADMA
ledtrig-cpu: registered to indicate activity on CPUs
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
fpga_manager fpga0: Xilinx Zynq FPGA Manager registered
NET: Registered protocol family 10
Segment Routing with IPv6
sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver
NET: Registered protocol family 17
can: controller area network core (rev 20170425 abi 9)
NET: Registered protocol family 29
can: raw protocol (rev 20170425)
can: broadcast manager protocol (rev 20170425 t)
can: netlink gateway (rev 20170425) max_hops=1
Registering SWP/SWPB emulation handler
hctosys: unable to open rtc device (rtc0)
of_cfs_init
of_cfs_init: OK
ALSA device list:
  No soundcards found.
Warning: unable to open an initial console.
Freeing unused kernel memory: 15360K
udevd[758]: starting version 3.2.2
udevd[759]: starting eudev-3.2.2
cma: cma_alloc(cma c184d360, count 1, align 0)
cma: cma_alloc(): returned eff7f840
cma: cma_alloc(cma c184d360, count 1, align 0)
cma: cma_alloc(): returned eff7f860
IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
macb e000b000.ethernet eth0: link up (1000/Full)
IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
random: crng init done
luscher2: loading out-of-tree module taints kernel.
luscher 40400000.dma: Device Tree Probing
luscher 40400000.dma: luscher at 0x40400000 mapped to 0xf09c0000, irq=49
 buff size 0xee9d6340
 buff number 0x00000000
cma: cma_alloc(cma c184d360, count 0, align 8)
luscher 40400000.dma: Buffer memory allocation failed
Buffer memory allocation failed
luscher: probe of 40400000.dma failed with error -12

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