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  1. 17 Oct, 2020 13 commits
  3. 16 Oct, 2020 22 commits
  5. 15 Oct, 2020 5 commits
    • Daniel Vetter's avatar
      drm/vkms: Switch to shmem helpers · 488c888a
      Daniel Vetter authored 
      Inspired by a patch by Chris Wilson for vgem. Plus this gives us vmap
at the gem bo level, which we need for generic fbdev emulation.

Luckily shmem also tracks ->vaddr, so we just need to adjust the code
all over a bit to make this fit.

Also wire up handle_to_fd, dunno why that was missing.

v2:
- Drop now unused container_of #define (Melissa)
- Make sure we keep creating cached objects, this is for testing
  (Thomas)
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
Cc: Melissa Wen <melissa.srw@gmail.com>
Cc: Haneen Mohammed <hamohammed.sa@gmail.com>
Acked-by: default avatarThomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: default avatarMelissa Wen <melissa.srw@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201013111027.375999-1-daniel.vetter@ffwll.ch
      488c888a
    • Daniel Vetter's avatar
      drm/vkms: Set preferred depth correctly · 063bc37d
      Daniel Vetter authored 
      The only thing we support is xrgb8888.
Acked-by: default avatarThomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: default avatarMelissa Wen <melissa.srw@gmail.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@intel.com>
Cc: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
Cc: Melissa Wen <melissa.srw@gmail.com>
Cc: Haneen Mohammed <hamohammed.sa@gmail.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20201009232156.3916879-1-daniel.vetter@ffwll.ch
      063bc37d
    • Jianxin Xiong's avatar
      dma-buf: Clarify that dma-buf sg lists are page aligned · ac80cd17
      Jianxin Xiong authored 
      The dma-buf API have been used under the assumption that the sg lists
returned from dma_buf_map_attachment() are fully page aligned. Lots of
stuff can break otherwise all over the place. Clarify this in the
documentation and add a check when DMA API debug is enabled.
Signed-off-by: default avatarJianxin Xiong <jianxin.xiong@intel.com>
Reviewed-by: default avatarChristian König <christian.koenig@amd.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1602692161-107096-1-git-send-email-jianxin.xiong@intel.com
      ac80cd17
    • Zwane Mwaikambo's avatar
      drm/dp_aux_dev: check aux_dev before use in drm_dp_aux_dev_get_by_minor() · 73b62cdb
      Zwane Mwaikambo authored 
      I observed this when unplugging a DP monitor whilst a computer is asleep
and then waking it up. This left DP chardev nodes still being present on
the filesystem and accessing these device nodes caused an oops because
drm_dp_aux_dev_get_by_minor() assumes a device exists if it is opened.
This can also be reproduced by creating a device node with mknod(1) and
issuing an open(2)

[166164.933198] BUG: kernel NULL pointer dereference, address: 0000000000000018
[166164.933202] #PF: supervisor read access in kernel mode
[166164.933204] #PF: error_code(0x0000) - not-present page
[166164.933205] PGD 0 P4D 0
[166164.933208] Oops: 0000 [#1] PREEMPT SMP NOPTI
[166164.933211] CPU: 4 PID: 99071 Comm: fwupd Tainted: G        W
5.8.0-rc6+ #1
[166164.933213] Hardware name: LENOVO 20RD002VUS/20RD002VUS, BIOS R16ET25W
(1.11 ) 04/21/2020
[166164.933232] RIP: 0010:drm_dp_aux_dev_get_by_minor+0x29/0x70
[drm_kms_helper]
[166164.933234] Code: 00 0f 1f 44 00 00 55 48 89 e5 41 54 41 89 fc 48 c7
c7 60 01 a4 c0 e8 26 ab 30 d7 44 89 e6 48 c7 c7 80 01 a4 c0 e8 47 94 d6 d6
<8b> 50 18 49 89 c4 48 8d 78 18 85 d2 74 33 8d 4a 01 89 d0 f0 0f b1
[166164.933236] RSP: 0018:ffffb7d7c41cbbf0 EFLAGS: 00010246
[166164.933237] RAX: 0000000000000000 RBX: ffff8a90001fe900 RCX: 0000000000000000
[166164.933238] RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffffffffc0a40180
[166164.933239] RBP: ffffb7d7c41cbbf8 R08: 0000000000000000 R09: ffff8a93e157d6d0
[166164.933240] R10: 0000000000000000 R11: ffffffffc0a40188 R12: 0000000000000003
[166164.933241] R13: ffff8a9402200e80 R14: ffff8a90001fe900 R15: 0000000000000000
[166164.933244] FS:  00007f7fb041eb00(0000) GS:ffff8a9411500000(0000)
knlGS:0000000000000000
[166164.933245] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[166164.933246] CR2: 0000000000000018 CR3: 00000000352c2003 CR4: 00000000003606e0
[166164.933247] Call Trace:
[166164.933264]  auxdev_open+0x1b/0x40 [drm_kms_helper]
[166164.933278]  chrdev_open+0xa7/0x1c0
[166164.933282]  ? cdev_put.part.0+0x20/0x20
[166164.933287]  do_dentry_open+0x161/0x3c0
[166164.933291]  vfs_open+0x2d/0x30
[166164.933297]  path_openat+0xb27/0x10e0
[166164.933306]  ? atime_needs_update+0x73/0xd0
[166164.933309]  do_filp_open+0x91/0x100
[166164.933313]  ? __alloc_fd+0xb2/0x150
[166164.933316]  do_sys_openat2+0x210/0x2d0
[166164.933318]  do_sys_open+0x46/0x80
[166164.933320]  __x64_sys_openat+0x20/0x30
[166164.933328]  do_syscall_64+0x52/0xc0
[166164.933336]  entry_SYSCALL_64_after_hwframe+0x44/0xa9

(gdb) disassemble drm_dp_aux_dev_get_by_minor+0x29
Dump of assembler code for function drm_dp_aux_dev_get_by_minor:
   0x0000000000017b10 <+0>:     callq  0x17b15 <drm_dp_aux_dev_get_by_minor+5>
   0x0000000000017b15 <+5>:     push   %rbp
   0x0000000000017b16 <+6>:     mov    %rsp,%rbp
   0x0000000000017b19 <+9>:     push   %r12
   0x0000000000017b1b <+11>:    mov    %edi,%r12d
   0x0000000000017b1e <+14>:    mov    $0x0,%rdi
   0x0000000000017b25 <+21>:    callq  0x17b2a <drm_dp_aux_dev_get_by_minor+26>
   0x0000000000017b2a <+26>:    mov    %r12d,%esi
   0x0000000000017b2d <+29>:    mov    $0x0,%rdi
   0x0000000000017b34 <+36>:    callq  0x17b39 <drm_dp_aux_dev_get_by_minor+41>
   0x0000000000017b39 <+41>:    mov    0x18(%rax),%edx <=========
   0x0000000000017b3c <+44>:    mov    %rax,%r12
   0x0000000000017b3f <+47>:    lea    0x18(%rax),%rdi
   0x0000000000017b43 <+51>:    test   %edx,%edx
   0x0000000000017b45 <+53>:    je     0x17b7a <drm_dp_aux_dev_get_by_minor+106>
   0x0000000000017b47 <+55>:    lea    0x1(%rdx),%ecx
   0x0000000000017b4a <+58>:    mov    %edx,%eax
   0x0000000000017b4c <+60>:    lock cmpxchg %ecx,(%rdi)
   0x0000000000017b50 <+64>:    jne    0x17b76 <drm_dp_aux_dev_get_by_minor+102>
   0x0000000000017b52 <+66>:    test   %edx,%edx
   0x0000000000017b54 <+68>:    js     0x17b6d <drm_dp_aux_dev_get_by_minor+93>
   0x0000000000017b56 <+70>:    test   %ecx,%ecx
   0x0000000000017b58 <+72>:    js     0x17b6d <drm_dp_aux_dev_get_by_minor+93>
   0x0000000000017b5a <+74>:    mov    $0x0,%rdi
   0x0000000000017b61 <+81>:    callq  0x17b66 <drm_dp_aux_dev_get_by_minor+86>
   0x0000000000017b66 <+86>:    mov    %r12,%rax
   0x0000000000017b69 <+89>:    pop    %r12
   0x0000000000017b6b <+91>:    pop    %rbp
   0x0000000000017b6c <+92>:    retq
   0x0000000000017b6d <+93>:    xor    %esi,%esi
   0x0000000000017b6f <+95>:    callq  0x17b74 <drm_dp_aux_dev_get_by_minor+100>
   0x0000000000017b74 <+100>:   jmp    0x17b5a <drm_dp_aux_dev_get_by_minor+74>
   0x0000000000017b76 <+102>:   mov    %eax,%edx
   0x0000000000017b78 <+104>:   jmp    0x17b43 <drm_dp_aux_dev_get_by_minor+51>
   0x0000000000017b7a <+106>:   xor    %r12d,%r12d
   0x0000000000017b7d <+109>:   jmp    0x17b5a <drm_dp_aux_dev_get_by_minor+74>
End of assembler dump.

(gdb) list *drm_dp_aux_dev_get_by_minor+0x29
0x17b39 is in drm_dp_aux_dev_get_by_minor (drivers/gpu/drm/drm_dp_aux_dev.c:65).
60      static struct drm_dp_aux_dev *drm_dp_aux_dev_get_by_minor(unsigned index)
61      {
62              struct drm_dp_aux_dev *aux_dev = NULL;
63
64              mutex_lock(&aux_idr_mutex);
65              aux_dev = idr_find(&aux_idr, index);
66              if (!kref_get_unless_zero(&aux_dev->refcount))
67                      aux_dev = NULL;
68              mutex_unlock(&aux_idr_mutex);
69
(gdb) p/x &((struct drm_dp_aux_dev *)(0x0))->refcount
$8 = 0x18

Looking at the caller, checks on the minor are pushed down to
drm_dp_aux_dev_get_by_minor()

static int auxdev_open(struct inode *inode, struct file *file)
{
    unsigned int minor = iminor(inode);
    struct drm_dp_aux_dev *aux_dev;

    aux_dev = drm_dp_aux_dev_get_by_minor(minor); <====
    if (!aux_dev)
        return -ENODEV;

    file->private_data = aux_dev;
    return 0;
}

Fixes: e94cb37b ("drm/dp: Add a drm_aux-dev module for reading/writing dpcd registers.")
Cc: <stable@vger.kernel.org> # v4.6+
Signed-off-by: default avatarZwane Mwaikambo <zwane@yosper.io>
Reviewed-by: default avatarLyude Paul <lyude@redhat.com>
[added Cc to stable]
Signed-off-by: default avatarLyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/alpine.DEB.2.21.2010122231070.38717@montezuma.home
      73b62cdb
    • Christian König's avatar
      drm/ttm: nuke caching placement flags · ce65b874
      Christian König authored 
      Changing the caching on the fly never really worked
flawlessly.

So stop this completely and just let drivers specific the
desired caching in the tt or bus object.
Signed-off-by: default avatarChristian König <christian.koenig@amd.com>
Reviewed-by: default avatarMichael J. Ruhl <michael.j.ruhl@intel.com>
Link: https://patchwork.freedesktop.org/patch/394256/
      ce65b874
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