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remoteproc: add IOMMU hardware capability flag

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The remoteproc framework currently relies on iommu_present() on
the bus the device is on, to perform MMU management. However, this
logic doesn't scale for multi-arch, especially for processors that
do not have an IOMMU. Replace this logic instead by using a h/w
capability flag for the presence of IOMMU in the rproc structure.

This issue is seen on OMAP platforms when trying to add a remoteproc
driver for a small Cortex M3 called the WkupM3 used for suspend /
resume management on TI AM335/AM437x SoCs. This processor does not
have an MMU. Same is the case with another processor subsystem
PRU-ICSS on AM335/AM437x. All these are platform devices, and the
current iommu_present check will not scale for the same kernel image
to support OMAP4/OMAP5 and AM335/AM437x.

The existing platform implementation drivers - OMAP remoteproc, STE
Modem remoteproc and DA8xx remoteproc, are updated as well to properly
configure the newly added rproc field.

Cc: Robert Tivy <rtivy@ti.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Suman Anna <s-anna@ti.com>
[small change in the commit title and in a single comment]
Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
This commit is contained in:
Suman Anna 2015-01-09 15:21:58 -06:00 • committed by Ohad Ben-Cohen
parent c517d838eb
commit 315491e5d6
5 changed files with 8 additions and 13 deletions
Download patch file Download diff file Expand all files Collapse all files

2
include/linux/remoteproc.h
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@ -404,6 +404,7 @@ enum rproc_crash_type {
* @table_ptr: pointer to the resource table in effect
* @cached_table: copy of the resource table
* @table_csum: checksum of the resource table
* @has_iommu: flag to indicate if remote processor is behind an MMU
*/
struct rproc {
struct klist_node node;
@ -435,6 +436,7 @@ struct rproc {
struct resource_table *table_ptr;
struct resource_table *cached_table;
u32 table_csum;
bool has_iommu;
};
/* we currently support only two vrings per rvdev */