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    • Dave Airlie's avatar
      nouveau/firmware: use dma non-coherent allocator · 9b340aeb
      Dave Airlie authored
      Currently, enabling SG_DEBUG in the kernel will cause nouveau to hit a
      BUG() on startup, when the iommu is enabled:
      
      kernel BUG at include/linux/scatterlist.h:187!
      invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
      CPU: 7 PID: 930 Comm: (udev-worker) Not tainted 6.9.0-rc3Lyude-Test+ #30
      Hardware name: MSI MS-7A39/A320M GAMING PRO (MS-7A39), BIOS 1.I0 01/22/2019
      RIP: 0010:sg_init_one+0x85/0xa0
      Code: 69 88 32 01 83 e1 03 f6 c3 03 75 20 a8 01 75 1e 48 09 cb 41 89 54
      24 08 49 89 1c 24 41 89 6c 24 0c 5b 5d 41 5c e9 7b b9 88 00 <0f> 0b 0f 0b
      0f 0b 48 8b 05 5e 46 9a 01 eb b2 66 66 2e 0f 1f 84 00
      RSP: 0018:ffffa776017bf6a0 EFLAGS: 00010246
      RAX: 0000000000000000 RBX: ffffa77600d87000 RCX: 000000000000002b
      RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffffa77680d87000
      RBP: 000000000000e000 R08: 0000000000000000 R09: 0000000000000000
      R10: ffff98f4c46aa508 R11: 0000000000000000 R12: ffff98f4c46aa508
      R13: ffff98f4c46aa008 R14: ffffa77600d4a000 R15: ffffa77600d4a018
      FS:  00007feeb5aae980(0000) GS:ffff98f5c4dc0000(0000) knlGS:0000000000000000
      CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      CR2: 00007f22cb9a4520 CR3: 00000001043ba000 CR4: 00000000003506f0
      Call Trace:
       <TASK>
       ? die+0x36/0x90
       ? do_trap+0xdd/0x100
       ? sg_init_one+0x85/0xa0
       ? do_error_trap+0x65/0x80
       ? sg_init_one+0x85/0xa0
       ? exc_invalid_op+0x50/0x70
       ? sg_init_one+0x85/0xa0
       ? asm_exc_invalid_op+0x1a/0x20
       ? sg_init_one+0x85/0xa0
       nvkm_firmware_ctor+0x14a/0x250 [nouveau]
       nvkm_falcon_fw_ctor+0x42/0x70 [nouveau]
       ga102_gsp_booter_ctor+0xb4/0x1a0 [nouveau]
       r535_gsp_oneinit+0xb3/0x15f0 [nouveau]
       ? srso_return_thunk+0x5/0x5f
       ? srso_return_thunk+0x5/0x5f
       ? nvkm_udevice_new+0x95/0x140 [nouveau]
       ? srso_return_thunk+0x5/0x5f
       ? srso_return_thunk+0x5/0x5f
       ? ktime_get+0x47/0xb0
      
      Fix this by using the non-coherent allocator instead, I think there
      might be a better answer to this, but it involve ripping up some of
      APIs using sg lists.
      
      Cc: stable@vger.kernel.org
      Fixes: 2541626c ("drm/nouveau/acr: use common falcon HS FW code for ACR FWs")
      Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
      Signed-off-by: default avatarDanilo Krummrich <dakr@kernel.org>
      Link: https://patchwork.freedesktop.org/patch/msgid/20240815201923.632803-1-airlied@gmail.com
      9b340aeb
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