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b0345bbc6d
Currently msi_bitmap_alloc_hwirqs() will round up any IRQ allocation requests to the nearest power of 2. eg. ask for 5 IRQs and you'll get 8. This wastes a lot of IRQs which can be a scarce resource. For cxl we may require multiple IRQs for every context that is attached to the accelerator. There may be 1000s of contexts attached, hence we can easily run out of IRQs, especially if we are needlessly wasting them. This changes the msi_bitmap_alloc_hwirqs() to allocate only the required number of IRQs, hence avoiding this wastage. It keeps the natural alignment requirement though. Signed-off-by: Ian Munsie <imunsie@au1.ibm.com> Signed-off-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> |
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