  We enlarge the dictionary between matrix models for long linear quivers
preserving eight supercharges in $d=5$ and $d=3$ and type IIB supergravity
backgrounds with AdS$_{d+1}$ factors. We introduce mass deformations of the
field theory that break the quiver into a collection of interacting linear
quivers, which are decoupled at the end of the RG flow. We find and solve a
Laplace problem in supergravity which realises these deformations
holographically. The free energy and expectation values of antisymmetric Wilson
loops are calculated on both sides of the proposed duality, finding agreement.
Our matching procedure sheds light on the F-theorem in five dimensions.
