cxl: Fix allocating a minimum of 2 pages for the SPA

The Scheduled Process Area is allocated dynamically with enough pages to
fit at least as many processes as the AFU descriptor indicated. Since
the calculation is non-trivial, it does this by calculating how many
processes could fit in an allocation of a given order, and increasing
that order until it can fit enough processes or hits the maximum
supported size.

Currently, it will start this search using a SPA of 2 pages instead of
1. This can waste a page of memory if the AFU's maximum number of
supported processes was small enough to fit in one page.

Fix the algorithm to start the search at 1 page.

Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
Reviewed-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Reviewed-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/drivers/misc/cxl/native.c b/drivers/misc/cxl/native.c
index e80d8f7d4dcbf5550387895060e96b9dc9021c0b..120c468ee9e07a41c40636930182502b9fe04218 100644 (file)
--- a/drivers/misc/cxl/native.c
+++ b/drivers/misc/cxl/native.c
@@ -189,7 +189,7 @@ int cxl_alloc_spa(struct cxl_afu *afu)
        unsigned spa_size;
 
        /* Work out how many pages to allocate */
-       afu->native->spa_order = 0;
+       afu->native->spa_order = -1;
        do {
                afu->native->spa_order++;
                spa_size = (1 << afu->native->spa_order) * PAGE_SIZE;