drm/nouveau: add support for MSI

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Only supported on NV50+ so far, and disabled by default currently.  The
module parameter "msi=1" will enable it.

There's a kernel bug which will cause this to fail if the module (or the
NVIDIA binary driver) has ever been loaded before loading nouveau with
MSI enabled.  As such, this is only safe to enable if you have nouveau
load on boot, and don't wish to ever reload it.

The workaround is to "echo 0 > /sys/bus/pci/devices/<device>/enable"
until the enable count reads 0.  Then you should be able to load nouveau
with MSI enabled.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

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This commit is contained in:

Ben Skeggs 2010-10-21 14:07:03 +10:00

parent 01d63187d1

commit 35fa2f2ad1

4 changed files with 47 additions and 6 deletions

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4

drivers/gpu/drm/nouveau/nouveau_drv.c

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5

drivers/gpu/drm/nouveau/nouveau_drv.h

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35

drivers/gpu/drm/nouveau/nouveau_irq.c

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9

drivers/gpu/drm/nouveau/nouveau_state.c

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