[Xen-devel] [PATCH v5 p1 05/14] xen/arm: Map disabled device in DOM0

[Julien Grall <julien.grall@xxxxxxxxxx>]

From: Julien Grall <julien.grall@xxxxxxxxxx>

The check to avoid mapping disabled devices in DOM0 was added in
anticipation of the device passthrough. But, a brand new property will
be added later to mark device which will be passthrough.

Also, remove the memory type check as we already skipped them earlier in
the function via skip_matches.

Furthermore, some platform (such as the OMAP) may try to poke device even
if the property "status" is set to "disabled".

Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
Acked-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Cc: Andrii Tseglytskyi <andrii.tseglytskyi@xxxxxxxxxxxxxxx>

---
    Changes in v4:
        - Typoes in the commit message
        - Add Ian and Stefano's ack

    Changes in v3:
        - Patch added
        - "xen/arm: follow-up to allow DOM0 manage IRQ and MMIO" has
        been split in 2 patch [1]
        - Drop the check for memory type. Thoses nodes have been
        blacklisted.

[1] https://patches.linaro.org/34669/
---
 xen/arch/arm/domain_build.c    | 19 +++----------------
 xen/arch/arm/platforms/omap5.c | 12 ------------
 2 files changed, 3 insertions(+), 28 deletions(-)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index ab4ad65..31b32df 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -1085,22 +1085,9 @@ static int handle_node(struct domain *d, struct 
kernel_info *kinfo,
         return 0;
     }
 
-    /*
-     * Some device doesn't need to be mapped in Xen:
-     *  - Memory: the guest will see a different view of memory. It will
-     *  be allocated later.
-     *  - Disabled device: Linux is able to cope with status="disabled"
-     *  property. Therefore these device doesn't need to be mapped. This
-     *  solution can be use later for pass through.
-     */
-    if ( !dt_device_type_is_equal(node, "memory") &&
-         dt_device_is_available(node) )
-    {
-        res = map_device(d, node);
-
-        if ( res )
-            return res;
-    }
+    res = map_device(d, node);
+    if ( res)
+        return res;
 
     /*
      * The property "name" is used to have a different name on older FDT
diff --git a/xen/arch/arm/platforms/omap5.c b/xen/arch/arm/platforms/omap5.c
index 9d6e504..e7bf30d 100644
--- a/xen/arch/arm/platforms/omap5.c
+++ b/xen/arch/arm/platforms/omap5.c
@@ -155,17 +155,6 @@ static const char * const dra7_dt_compat[] __initconst =
     NULL
 };
 
-static const struct dt_device_match dra7_blacklist_dev[] __initconst =
-{
-    /* OMAP Linux kernel handles devices with status "disabled" in a
-     * weird manner - tries to reset them. While their memory ranges
-     * are not mapped, this leads to data aborts, so skip these devices
-     * from DT for dom0.
-     */
-    DT_MATCH_NOT_AVAILABLE(),
-    { /* sentinel */ },
-};
-
 PLATFORM_START(omap5, "TI OMAP5")
     .compatible = omap5_dt_compat,
     .init_time = omap5_init_time,
@@ -185,7 +174,6 @@ PLATFORM_START(dra7, "TI DRA7")
 
     .dom0_gnttab_start = 0x4b000000,
     .dom0_gnttab_size = 0x20000,
-    .blacklist_dev = dra7_blacklist_dev,
 PLATFORM_END
 
 /*
-- 
2.1.4


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