Re: [PATCH v2] tools/testing/nvdimm: add virtual ramdisk range

Hi Dan, On Fri, Jul 15, 2016 at 12:35:58PM -0700, Dan Williams wrote: > Test the virtual disk ranges that platform firmware like EDK2/OVMF might > emit. > > Cc: "Lee, Chun-Yi" <jlee(a)suse.com&gt; > Signed-off-by: Dan Williams <dan.j.williams(a)intel.com&gt; > --- > Changes since v1: > > * Move this test range to nfit_test.1 to not break the spa ordering > expected by the nfit_test.0 tests. > I reviewed and tested this patch by nvdimm testing driver. Please feel free to add Reviewed-by: Lee, Chun-Yi <jlee(a)suse.com&gt; But I have a question to run nfit testing driver on OVMF. I always got "coherent allocation failed" as below: [ 86.530950] platform nfit_test.0: swiotlb buffer is full (sz: 134217728 bytes) [ 86.530954] swiotlb: coherent allocation failed for device nfit_test.0 size=134217728 [ 86.530956] CPU: 0 PID: 1291 Comm: insmod Tainted: G OE 4.7.0-rc7-default+ #323 [ 86.530958] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 0.0.0 02/06/2015 [ 86.530959] 0000000000000000 ffff880234e63bb0 ffffffff81334e5c 0000000008000000 [ 86.530961] ffff880232fa5998 ffff880234e63bf0 ffffffff8135eb79 ffff88020000000f [ 86.530963] 00000000024002c0 ffff880232fa5998 0000000008000000 ffff880234e63c68 [ 86.530965] Call Trace: [ 86.530971] [<ffffffff81334e5c>] dump_stack+0x63/0x87 [ 86.530975] [<ffffffff8135eb79>] swiotlb_alloc_coherent+0x149/0x160 [ 86.530978] [<ffffffff810611d3>] x86_swiotlb_alloc_coherent+0x43/0x50 [ 86.530981] [<ffffffffa054db3a>] dma_alloc_attrs.constprop.10+0x5a/0x80 [nfit_test] [ 86.530984] [<ffffffffa00d618c>] nfit_test_init+0x18c/0x1000 [nfit_test] [ 86.530985] [<ffffffffa00d6000>] ? 0xffffffffa00d6000 [ 86.530988] [<ffffffff81002190>] do_one_initcall+0x50/0x190 [ 86.530992] [<ffffffff811eef00>] ? kmem_cache_alloc_trace+0x170/0x220 [ 86.530995] [<ffffffff8118dbfc>] ? do_init_module+0x27/0x1e2 [ 86.530997] [<ffffffff8118dc35>] do_init_module+0x60/0x1e2 [ 86.531000] [<ffffffff81108fb1>] load_module+0x1411/0x1c20 [ 86.531002] [<ffffffff81105cb0>] ? __symbol_put+0x40/0x40 [ 86.531006] [<ffffffff812dfbbd>] ? ima_post_read_file+0x3d/0x80 [ 86.531009] [<ffffffff811099c9>] SYSC_finit_module+0xa9/0xd0 [ 86.531011] [<ffffffff81109a0e>] SyS_finit_module+0xe/0x10 [ 86.531013] [<ffffffff81003a62>] do_syscall_64+0x62/0x110 [ 86.531016] [<ffffffff81630a61>] entry_SYSCALL64_slow_path+0x25/0x25 [ 86.531018] platform nfit_test.0: need 128M of free cma I tried to add "swiotlb=65536" and "cma=128M" or "cma=256M", even "cma=2G" kernel parameters, but nfit-test.ko still can NOT allocate DMA success. So, I always add a patch to change the DIMM_SIZE to SZ_1M, that means test0 only uses 4M. Then the nfit-test.ko works for testing. Did I miss anything before running the nfit testing driver?