Re: [PATCH 10/29] drivers: add DRIVER_HAS_OWN_IOMMU_MANAGER flag

From: Marek Szyprowski
Date: Mon Sep 01 2014 - 01:22:43 EST

Hi Greg,

On 2014-08-05 12:47, Marek Szyprowski wrote:
This patch adds a new flags for device drivers. This flag instructs
kernel that the device driver does it own management of IOMMU assisted
IO address space translations, so no default dma-mapping structures
should be initialized.

Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
include/linux/device.h | 2 ++
1 file changed, 2 insertions(+)

diff --git a/include/linux/device.h b/include/linux/device.h
index 5f4ff02..2e62371 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -253,6 +253,8 @@ struct device_driver {
/* disables bind/unbind via sysfs */
+/* driver uses own methods to manage IO address space */
extern int __must_check driver_register(struct device_driver *drv);
extern void driver_unregister(struct device_driver *drv);

Could you comment if the approach of using flags in the struct driver
could be accepted? I've converted suppress_bind_attrs entry to flags to
avoid extending the structure, please see patch "[PATCH 05/29] drivers:
convert suppress_bind_attrs parameter into flags".

Best regards
Marek Szyprowski, PhD
Samsung R&D Institute Poland

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