On 5/23/2016 9:18 AM, Eric Auger wrote:
> On 05/16/2016 04:13 AM, Sinan Kaya wrote:
>> The code is using the compatible DT string to associate a reset driver
>> with the actual device itself. The compatible string does not exist on
>> ACPI based systems. HID is the unique identifier for a device driver
>> instead.
>>
>> Signed-off-by: Sinan Kaya <ok...@codeaurora.org>
>> ---
>> drivers/vfio/platform/vfio_platform_common.c | 58
>> ++++++++++++++++++++++++---
>> drivers/vfio/platform/vfio_platform_private.h | 1 +
>> 2 files changed, 54 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/vfio/platform/vfio_platform_common.c
>> b/drivers/vfio/platform/vfio_platform_common.c
>> index 25378bd..d859d3b 100644
>> --- a/drivers/vfio/platform/vfio_platform_common.c
>> +++ b/drivers/vfio/platform/vfio_platform_common.c
>> @@ -13,6 +13,7 @@
>> */
>>
>> #include <linux/device.h>
>> +#include <linux/acpi.h>
>> #include <linux/iommu.h>
>> #include <linux/module.h>
>> #include <linux/mutex.h>
>> @@ -49,6 +50,37 @@ static vfio_platform_reset_fn_t
>> vfio_platform_lookup_reset(const char *compat,
>> return reset_fn;
>> }
>>
>> +#ifdef CONFIG_ACPI
>> +int vfio_platform_acpi_probe(struct vfio_platform_device *vdev,
>> + struct device *dev)
> should be static
makes sense
>> +{
>> + struct acpi_device *adev = ACPI_COMPANION(dev);
>> +
>> + if (acpi_disabled)
>> + return -ENODEV;
>> +
>> + if (!adev) {
>> + pr_err("VFIO: ACPI companion device not found for %s\n",
>> + vdev->name);
>> + return -ENODEV;
>> + }
>> +
>> + vdev->acpihid = acpi_device_hid(adev);
>> + if (!vdev->acpihid) {
>> + pr_err("VFIO: cannot find ACPI HID for %s\n",
>> + vdev->name);
>> + return -ENODEV;
>> + }
>> + return 0;
>> +}
>> +#else
>> +int vfio_platform_acpi_probe(struct vfio_platform_device *vdev,
>> + struct device *dev)
> static inline?
yup
>> +{
>> + return -EINVAL;
> nit: -ENOENT ?
OK
>> +}
>> +#endif
>> +
>> static bool vfio_platform_has_reset(struct vfio_platform_device *vdev)
>> {
>> return vdev->of_reset ? true : false;
>> @@ -548,6 +580,21 @@ static const struct vfio_device_ops vfio_platform_ops =
>> {
>> .mmap = vfio_platform_mmap,
>> };
>>
>> +int vfio_platform_of_probe(struct vfio_platform_device *vdev,
>> + struct device *dev)
>> +{
>> + int ret;
>> +
>> + ret = device_property_read_string(dev, "compatible",
>> + &vdev->compat);
>> + if (ret) {
>> + pr_err("VFIO: cannot retrieve compat for %s\n",
>> + vdev->name);
>> + return ret;
>> + }
>> + return 0;
> nit: can be simplified by returning ret in any case.
will do
>
> Best Regards
>
> Eric
>
>> +}
>> +
>> int vfio_platform_probe_common(struct vfio_platform_device *vdev,
>> struct device *dev)
>> {
>> @@ -557,11 +604,12 @@ int vfio_platform_probe_common(struct
>> vfio_platform_device *vdev,
>> if (!vdev)
>> return -EINVAL;
>>
>> - ret = device_property_read_string(dev, "compatible", &vdev->compat);
>> - if (ret) {
>> - pr_err("VFIO: cannot retrieve compat for %s\n", vdev->name);
>> - return -EINVAL;
>> - }
>> + ret = vfio_platform_acpi_probe(vdev, dev);
>> + if (ret)
>> + ret = vfio_platform_of_probe(vdev, dev);
>> +
>> + if (ret)
>> + return ret;
>>
>> vdev->device = dev;
>>
>> diff --git a/drivers/vfio/platform/vfio_platform_private.h
>> b/drivers/vfio/platform/vfio_platform_private.h
>> index 71ed7d1..ba9e4f8 100644
>> --- a/drivers/vfio/platform/vfio_platform_private.h
>> +++ b/drivers/vfio/platform/vfio_platform_private.h
>> @@ -58,6 +58,7 @@ struct vfio_platform_device {
>> struct mutex igate;
>> struct module *parent_module;
>> const char *compat;
>> + const char *acpihid;
>> struct module *reset_module;
>> struct device *device;
>>
>>
>
--
Sinan Kaya
Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux
Foundation Collaborative Project
