dma-buf.rst: Document why indefinite fences are a bad idea

Comes up every few years, gets somewhat tedious to discuss, let's
write this down once and for all.

What I'm not sure about is whether the text should be more explicit in
flat out mandating the amdkfd eviction fences for long running compute
workloads or workloads where userspace fencing is allowed.

v2: Now with dot graph!

v3: Typo (Dave Airlie)

Reviewed-by: Thomas Hellstrom <[email protected]>
Acked-by: Jason Ekstrand <[email protected]>
Acked-by: Christian König <[email protected]>
Acked-by: Daniel Stone <[email protected]>
Acked-by: Dave Airlie <[email protected]>
Reviewed-by: Maarten Lankhorst <[email protected]>
Cc: Jesse Natalie <[email protected]>
Cc: Steve Pronovost <[email protected]>
Cc: Jason Ekstrand <[email protected]>
Cc: Felix Kuehling <[email protected]>
Cc: Mika Kuoppala <[email protected]>
Cc: Thomas Hellstrom <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: Chris Wilson <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Christian König <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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