Belisko Marek <marek.belisko@xxxxxxxxx> writes: > Hi, > On Thu, May 28, 2020 at 11:06 AM Felipe Balbi <balbi@xxxxxxxxxx> wrote: >> >> >> Hi, >> >> Belisko Marek <marek.belisko@xxxxxxxxx> writes: >> > we're using USB RAW gadget for communicating with PC application. We >> > have created loopback test which send file (any size) from PC to >> > device and then same data are sent back to PC to verify roundtrip time >> > (using bulk data transfer). Everything works fine up to 3MB file size. >> > If we sent bigger file like e.g. 5M we can receive file on device but >> > when we want to write to output endpoint we got: >> > >> > WARNING: CPU: 0 PID: 12299 at /kernel-source//mm/page_alloc.c:3725 >> > __alloc_pages_nodemask+0x1b0/0xde4 >> > [<c010fa08>] (unwind_backtrace) from [<c010c45c>] (show_stack+0x20/0x24) >> > [<c010c45c>] (show_stack) from [<c04cc0d4>] (dump_stack+0x20/0x28) >> > [<c04cc0d4>] (dump_stack) from [<c01324ac>] (__warn+0xec/0x108) >> > [<c01324ac>] (__warn) from [<c0132598>] (warn_slowpath_null+0x30/0x38) >> > [<c0132598>] (warn_slowpath_null) from [<c021ccb8>] >> > (__alloc_pages_nodemask+0x1b0/0xde4) >> > [<c021ccb8>] (__alloc_pages_nodemask) from [<c023b888>] >> > (kmalloc_order+0x2c/0x48) >> > [<c023b888>] (kmalloc_order) from [<c023b8d0>] (kmalloc_order_trace+0x2c/0xd4) >> > [<c023b8d0>] (kmalloc_order_trace) from [<c0261c24>] (__kmalloc+0x40/0x264) >> > [<c0261c24>] (__kmalloc) from [<bf039bc4>] (ffs_epfile_io+0x13c/0x570 >> > [usb_f_fs]) >> > [<bf039bc4>] (ffs_epfile_io [usb_f_fs]) from [<bf03a0c0>] >> > (ffs_epfile_write_iter+0xc8/0x120 [usb_f_fs]) >> > [<bf03a0c0>] (ffs_epfile_write_iter [usb_f_fs]) from [<c02734bc>] >> > (new_sync_write+0xc8/0xec) >> > [<c02734bc>] (new_sync_write) from [<c027351c>] (__vfs_write+0x3c/0x48) >> > [<c027351c>] (__vfs_write) from [<c02749a0>] (vfs_write+0xcc/0x158) >> > [<c02749a0>] (vfs_write) from [<c02756ac>] (SyS_write+0x50/0x88) >> > [<c02756ac>] (SyS_write) from [<c0107a20>] (ret_fast_syscall+0x0/0x54) >> > ---[ end trace fe5f79fe415b9881 ]--- >> > >> > and write ends up with: write /run/ffs/ep1: cannot allocate memory >> > >> > When checked free command there should be plenty of available memory. >> > Is there some limitation when writing to endpoint? We tried to split >> > buffer to e.g. 3M and sent it and this works but looks like there is >> > penalty when sending bigger files (100MB file received in 5secs whicle >> > sending back it took 2minutes). Thanks for ideas and hints. >> >> that's trying to allocate a 5MiB buffer in kernel space. It just goes >> over max allocation size, I'm assuming. Which kernel version are you >> using? Which gadget controller are you using? > We' using mainline 4.12 kernel and gadget is raw gadget using ffs + that's old. Really, really old. You should ask for support from whoever gave you that kernel. An alternative, upgrade to v5.6 latest stable or latest v5.7-rc. > composite drivers. Right, and which UDC controller? -- balbi
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