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19d4b72c0c
linux/drivers/gpu/drm
History
Maarten Lankhorst 19d4b72c0c drm/cirrus: do not attempt to acquire a reservation while in an interrupt handler 
Mutexes should not be acquired in interrupt context. While the trylock
fastpath is arguably safe on all implementations, the slowpath
unlock path definitely isn't. This fixes the following lockdep splat:

[   13.044313] ------------[ cut here ]------------
[   13.044367] WARNING: at /c/kernel-tests/src/tip/kernel/mutex.c:858 mutex_trylock+0x87/0x220()
[   13.044378] DEBUG_LOCKS_WARN_ON(in_interrupt())
[   13.044378] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.10.0-rc4-00296-ga2963dd #20
[   13.044379] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007
[   13.044390]  0000000000000009 ffff88000de039f8 ffffffff81fc86d5 ffff88000de03a38
[   13.044395]  ffffffff810d511b ffff880000000018 ffff88000f33c690 0000000000000001
[   13.044398]  00000000000003f0 ffff88000f4677c8 0000000000000000 ffff88000de03a98
[   13.044400] Call Trace:
[   13.044412]  <IRQ>  [<ffffffff81fc86d5>] dump_stack+0x19/0x1b
[   13.044441]  [<ffffffff810d511b>] warn_slowpath_common+0x6b/0x90
[   13.044445]  [<ffffffff810d51a6>] warn_slowpath_fmt+0x46/0x50
[   13.044448]  [<ffffffff81fd34d7>] mutex_trylock+0x87/0x220
[   13.044482]  [<ffffffff8186484d>] cirrus_dirty_update+0x1cd/0x330
[   13.044486]  [<ffffffff818649e8>] cirrus_imageblit+0x38/0x50
[   13.044506]  [<ffffffff8165782e>] soft_cursor+0x22e/0x240
[   13.044510]  [<ffffffff81656c31>] bit_cursor+0x581/0x5b0
[   13.044525]  [<ffffffff815de9f4>] ? vsnprintf+0x124/0x670
[   13.044529]  [<ffffffff81651333>] ? get_color.isra.16+0x43/0x130
[   13.044532]  [<ffffffff81653fca>] fbcon_cursor+0x18a/0x1d0
[   13.044535]  [<ffffffff816566b0>] ? update_attr.isra.2+0xa0/0xa0
[   13.044556]  [<ffffffff81754b82>] hide_cursor+0x32/0xa0
[   13.044565]  [<ffffffff81755bd3>] vt_console_print+0x103/0x3b0
[   13.044569]  [<ffffffff810d58ac>] ? print_time+0x9c/0xb0
[   13.044576]  [<ffffffff810d5960>] ? print_prefix+0xa0/0xc0
[   13.044580]  [<ffffffff810d63f6>] call_console_drivers.constprop.6+0x146/0x1f0
[   13.044593]  [<ffffffff815f9b38>] ? do_raw_spin_unlock+0xc8/0x100
[   13.044597]  [<ffffffff810d6f27>] console_unlock+0x2f7/0x460
[   13.044600]  [<ffffffff810d787a>] vprintk_emit+0x59a/0x5e0
[   13.044615]  [<ffffffff81fb676c>] printk+0x4d/0x4f
[   13.044650]  [<ffffffff82ba5511>] print_local_APIC+0x28/0x41c
[   13.044672]  [<ffffffff8114db55>] generic_smp_call_function_single_interrupt+0x145/0x2b0
[   13.044688]  [<ffffffff8106f9e7>] smp_call_function_single_interrupt+0x27/0x40
[   13.044697]  [<ffffffff81fd8f72>] call_function_single_interrupt+0x72/0x80
[   13.044707]  <EOI>  [<ffffffff81078166>] ? native_safe_halt+0x6/0x10
[   13.044717]  [<ffffffff811425cd>] ? trace_hardirqs_on+0xd/0x10
[   13.044738]  [<ffffffff8104f669>] default_idle+0x59/0x120
[   13.044742]  [<ffffffff810501e8>] arch_cpu_idle+0x18/0x40
[   13.044754]  [<ffffffff811320c5>] cpu_startup_entry+0x235/0x410
[   13.044763]  [<ffffffff81f9e781>] rest_init+0xd1/0xe0
[   13.044766]  [<ffffffff81f9e6b5>] ? rest_init+0x5/0xe0
[   13.044778]  [<ffffffff82b93ec2>] start_kernel+0x425/0x493
[   13.044781]  [<ffffffff82b93810>] ? repair_env_string+0x5e/0x5e
[   13.044786]  [<ffffffff82b93595>] x86_64_start_reservations+0x2a/0x2c
[   13.044789]  [<ffffffff82b93688>] x86_64_start_kernel+0xf1/0x100
[   13.044799] ---[ end trace 113ad28772af4058 ]---

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2013-06-28 11:56:30 +10:00
..
ast drm (ast, cirrus, mgag200, nouveau, savage, vmwgfx): Remove drm_mtrr_{add, del} 2013-05-31 13:02:54 +10:00
cirrus drm/cirrus: do not attempt to acquire a reservation while in an interrupt handler 2013-06-28 11:56:30 +10:00
exynos drm: Drop all the stub gamma_get, gamma_set, load_lut functions from drivers 2013-06-17 19:42:47 +10:00
gma500 Merge branch 'gma500-fixes' of git://github.com/patjak/drm-gma500 into drm-fixes 2013-06-11 08:16:10 +10:00
i2c drm/i2c: nxp-tda998x (v3) 2013-02-19 17:57:44 -05:00
i810
i915 Merge tag 'drm-intel-next-2013-06-18' of git://people.freedesktop.org/~danvet/drm-intel into drm-next 2013-06-28 09:50:34 +10:00
mga
mgag200 drm/mgag200: Added resolution and bandwidth limits for various G200e products. 2013-06-28 08:45:09 +10:00
nouveau drm/nouveau: always select ACPI_VIDEO if ACPI is enabled. 2013-06-28 11:56:22 +10:00
omapdrm drm/omap: change "!CONFIG_FB_OMAP2" to "!FB_OMAP2" 2013-06-27 21:14:32 +10:00
qxl drm/qxl: add support for cursor hotspot. 2013-06-28 09:13:56 +10:00
r128
radeon drm/radeon: implement unpin function, v2 2013-06-28 11:55:11 +10:00
rcar-du drm: Renesas R-Car Display Unit DRM driver 2013-06-27 10:08:04 +10:00
savage drm (ast, cirrus, mgag200, nouveau, savage, vmwgfx): Remove drm_mtrr_{add, del} 2013-05-31 13:02:54 +10:00
shmobile drm/shmobile: Enable compilation on all ARM platforms 2013-06-20 10:07:14 +02:00
sis drm/sis: convert to idr_alloc() 2013-02-27 19:10:16 -08:00
tdfx
tilcdc drm/tilcdc: Clear bits of register we're going to set. 2013-06-28 09:13:00 +10:00
ttm drm: use vma_pages() to replace (vm_end - vm_start) >> PAGE_SHIFT 2013-04-16 13:14:00 +10:00
udl drm: Drop all the stub gamma_get, gamma_set, load_lut functions from drivers 2013-06-17 19:42:47 +10:00
via drm/via: convert to idr_alloc() 2013-02-27 19:10:16 -08:00
vmwgfx drm/vmwgfx: Don't access file_priv in cursor_set when handle==0 2013-06-11 08:47:32 +10:00
ati_pcigart.c
drm_agpsupport.c
drm_auth.c
drm_buffer.c
drm_bufs.c drm: Don't leak phys_wc "handles" to userspace 2013-05-31 13:37:39 +10:00
drm_cache.c lib/scatterlist: sg_page_iter: support sg lists w/o backing pages 2013-03-27 17:13:44 +01:00
drm_context.c drm: convert to idr_alloc() 2013-02-27 19:10:15 -08:00
drm_crtc_helper.c drm: kms_helper: don't lose hotplug event 2013-06-27 20:34:16 +10:00
drm_crtc.c drm: add hotspot support for cursors. 2013-06-28 09:13:39 +10:00
drm_debugfs.c
drm_dma.c
drm_dp_helper.c
drm_drv.c drm: add hotspot support for cursors. 2013-06-28 09:13:39 +10:00
drm_edid_load.c drm: Cocci spatch "memdup.spatch" 2013-06-11 08:29:22 +10:00
drm_edid.c drm/edid: Don't print messages regarding stereo or csync by default 2013-06-27 21:15:44 +10:00
drm_encoder_slave.c drm: refactor call to request_module 2013-05-10 14:46:03 +10:00
drm_fb_cma_helper.c Merge branch 'tilcdc-next' of git://people.freedesktop.org/~robclark/linux into drm-next 2013-02-21 09:31:47 +10:00
drm_fb_helper.c drm/fb-helper: Make load_lut and gamma_set/gamma_get hooks optional 2013-06-17 19:42:47 +10:00
drm_fops.c drm: correctly restore mappings if drm_open fails 2013-04-03 06:44:38 +10:00
drm_gem_cma_helper.c drm/cma: Cocci spatch "ptr_ret.spatch" 2013-06-11 08:30:54 +10:00
drm_gem.c drm/gem: Split drm_gem_mmap() into object search and object mapping 2013-06-08 09:14:03 +02:00
drm_global.c
drm_hashtab.c hlist: drop the node parameter from iterators 2013-02-27 19:10:24 -08:00
drm_info.c
drm_ioc32.c
drm_ioctl.c drm: Don't leak phys_wc "handles" to userspace 2013-05-31 13:37:39 +10:00
drm_irq.c drm: fix a use-after-free when GPU acceleration disabled 2013-06-03 19:12:04 +10:00
drm_lock.c
drm_memory.c
drm_mm.c drm/mm: fix dump table BUG 2013-04-30 15:15:58 +02:00
drm_modes.c drm: Sort connector modes based on vrefresh 2013-06-11 08:35:51 +10:00
drm_pci.c drm, agpgart: Use pgprot_writecombine for AGP maps and make the MTRR optional 2013-05-31 13:37:31 +10:00
drm_platform.c
drm_prime.c Linux 3.10-rc7 2013-06-27 20:40:44 +10:00
drm_proc.c drm: proc: Use remove_proc_subtree() 2013-05-01 17:29:44 -04:00
drm_rect.c drm: Add drm_rect_debug_print() 2013-04-30 22:20:00 +02:00
drm_scatter.c
drm_stub.c drm: drm_stub: Fixing return value if driver master_set call failed 2013-06-27 21:03:16 +10:00
drm_sysfs.c
drm_trace_points.c
drm_trace.h
drm_usb.c drm/usb: bind driver to correct device 2013-02-07 12:37:41 +10:00
drm_vm.c drm_vm: drop explicit VM_IO setting 2013-06-24 06:26:50 +10:00
Kconfig drm/nouveau: always select ACPI_VIDEO if ACPI is enabled. 2013-06-28 11:56:22 +10:00
Makefile drm: Renesas R-Car Display Unit DRM driver 2013-06-27 10:08:04 +10:00
README.drm

README.drm 

************************************************************
* For the very latest on DRI development, please see:      *
*     http://dri.freedesktop.org/                          *
************************************************************

The Direct Rendering Manager (drm) is a device-independent kernel-level
device driver that provides support for the XFree86 Direct Rendering
Infrastructure (DRI).

The DRM supports the Direct Rendering Infrastructure (DRI) in four major
ways:

    1. The DRM provides synchronized access to the graphics hardware via
       the use of an optimized two-tiered lock.

    2. The DRM enforces the DRI security policy for access to the graphics
       hardware by only allowing authenticated X11 clients access to
       restricted regions of memory.

    3. The DRM provides a generic DMA engine, complete with multiple
       queues and the ability to detect the need for an OpenGL context
       switch.

    4. The DRM is extensible via the use of small device-specific modules
       that rely extensively on the API exported by the DRM module.


Documentation on the DRI is available from:
    http://dri.freedesktop.org/wiki/Documentation
    http://sourceforge.net/project/showfiles.php?group_id=387
    http://dri.sourceforge.net/doc/

For specific information about kernel-level support, see:

    The Direct Rendering Manager, Kernel Support for the Direct Rendering
    Infrastructure
    http://dri.sourceforge.net/doc/drm_low_level.html

    Hardware Locking for the Direct Rendering Infrastructure
    http://dri.sourceforge.net/doc/hardware_locking_low_level.html

    A Security Analysis of the Direct Rendering Infrastructure
    http://dri.sourceforge.net/doc/security_low_level.html