linux-kernel - Re: [PATCH 1/5] of: unittest: overlay: Keep track of created overlays

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Date:	Tue, 24 Mar 2015 23:53:03 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Pantelis Antoniou <pantelis.antoniou@...sulko.com>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Matt Porter <matt.porter@...aro.org>,
	Koen Kooi <koen@...inion.thruhere.net>,
	Guenter Roeck <linux@...ck-us.net>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
	Pantelis Antoniou <panto@...oniou-consulting.com>
Subject: Re: [PATCH 1/5] of: unittest: overlay: Keep track of created overlays

On Tue, Mar 17, 2015 at 3:30 PM, Pantelis Antoniou
<pantelis.antoniou@...sulko.com> wrote:
> During the course of the overlay selftests some of them remain
> applied. While this does not pose a real problem, make sure you track
> them and destroy them at the end of the test.

This is going to need to be rebased on my tree as there has been some
selftest->unitest renaming.

Rob

>
> Signed-off-by: Pantelis Antoniou <pantelis.antoniou@...sulko.com>
> ---
>  drivers/of/unittest.c | 62 +++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 62 insertions(+)
>
> diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
> index 4e60682..c711534 100644
> --- a/drivers/of/unittest.c
> +++ b/drivers/of/unittest.c
> @@ -23,6 +23,8 @@
>  #include <linux/i2c.h>
>  #include <linux/i2c-mux.h>
>
> +#include <linux/bitops.h>
> +
>  #include "of_private.h"
>
>  static struct selftest_results {
> @@ -1115,6 +1117,59 @@ static const char *overlay_path(int nr)
>
>  static const char *bus_path = "/testcase-data/overlay-node/test-bus";
>
> +/* it is guaranteed that overlay ids are assigned in sequence */
> +#define MAX_SELFTEST_OVERLAYS  256
> +static unsigned long overlay_id_bits[BITS_TO_LONGS(MAX_SELFTEST_OVERLAYS)];
> +static int overlay_first_id = -1;
> +
> +static void of_selftest_track_overlay(int id)
> +{
> +       if (overlay_first_id < 0)
> +               overlay_first_id = id;
> +       id -= overlay_first_id;
> +
> +       /* we shouldn't need that many */
> +       BUG_ON(id >= MAX_SELFTEST_OVERLAYS);
> +       overlay_id_bits[BIT_WORD(id)] |= BIT_MASK(id);
> +}
> +
> +static void of_selftest_untrack_overlay(int id)
> +{
> +       if (overlay_first_id < 0)
> +               return;
> +       id -= overlay_first_id;
> +       BUG_ON(id >= MAX_SELFTEST_OVERLAYS);
> +       overlay_id_bits[BIT_WORD(id)] &= ~BIT_MASK(id);
> +}
> +
> +static void of_selftest_destroy_tracked_overlays(void)
> +{
> +       int id, ret, defers;
> +
> +       if (overlay_first_id < 0)
> +               return;
> +
> +       /* try until no defers */
> +       do {
> +               defers = 0;
> +               /* remove in reverse order */
> +               for (id = MAX_SELFTEST_OVERLAYS - 1; id >= 0; id--) {
> +                       if (!(overlay_id_bits[BIT_WORD(id)] & BIT_MASK(id)))
> +                               continue;
> +
> +                       ret = of_overlay_destroy(id + overlay_first_id);
> +                       if (ret != 0) {
> +                               defers++;
> +                               pr_warn("%s: overlay destroy failed for #%d\n",
> +                                       __func__, id + overlay_first_id);
> +                               continue;
> +                       }
> +
> +                       overlay_id_bits[BIT_WORD(id)] &= ~BIT_MASK(id);
> +               }
> +       } while (defers > 0);
> +}
> +
>  static int of_selftest_apply_overlay(int selftest_nr, int overlay_nr,
>                 int *overlay_id)
>  {
> @@ -1136,6 +1191,7 @@ static int of_selftest_apply_overlay(int selftest_nr, int overlay_nr,
>                 goto out;
>         }
>         id = ret;
> +       of_selftest_track_overlay(id);
>
>         ret = 0;
>
> @@ -1349,6 +1405,7 @@ static void of_selftest_overlay_6(void)
>                         return;
>                 }
>                 ov_id[i] = ret;
> +               of_selftest_track_overlay(ov_id[i]);
>         }
>
>         for (i = 0; i < 2; i++) {
> @@ -1373,6 +1430,7 @@ static void of_selftest_overlay_6(void)
>                                                 PDEV_OVERLAY));
>                         return;
>                 }
> +               of_selftest_untrack_overlay(ov_id[i]);
>         }
>
>         for (i = 0; i < 2; i++) {
> @@ -1417,6 +1475,7 @@ static void of_selftest_overlay_8(void)
>                         return;
>                 }
>                 ov_id[i] = ret;
> +               of_selftest_track_overlay(ov_id[i]);
>         }
>
>         /* now try to remove first overlay (it should fail) */
> @@ -1439,6 +1498,7 @@ static void of_selftest_overlay_8(void)
>                                                 PDEV_OVERLAY));
>                         return;
>                 }
> +               of_selftest_untrack_overlay(ov_id[i]);
>         }
>
>         selftest(1, "overlay test %d passed\n", 8);
> @@ -1861,6 +1921,8 @@ static void __init of_selftest_overlay(void)
>         of_selftest_overlay_i2c_cleanup();
>  #endif
>
> +       of_selftest_destroy_tracked_overlays();
> +
>  out:
>         of_node_put(bus_np);
>  }
> --
> 1.7.12
>
--
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