From: Sinan Kaya <okaya@codeaurora.org>
To: kvm@vger.kernel.org, timur@codeaurora.org, cov@codeaurora.org,
jcm@redhat.com, eric.auger@linaro.org
Cc: linux-acpi@vger.kernel.org, agross@codeaurora.org,
linux-arm-msm@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Sinan Kaya <okaya@codeaurora.org>,
Baptiste Reynal <b.reynal@virtualopensystems.com>,
Alex Williamson <alex.williamson@redhat.com>,
linux-kernel@vger.kernel.org
Subject: [PATCH V6 3/8] vfio: platform: add support for ACPI probe
Date: Sat, 28 May 2016 18:01:13 -0400 [thread overview]
Message-ID: <1464472878-27176-4-git-send-email-okaya@codeaurora.org> (raw)
In-Reply-To: <1464472878-27176-1-git-send-email-okaya@codeaurora.org>
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 <okaya@codeaurora.org>
---
drivers/vfio/platform/vfio_platform_common.c | 57 ++++++++++++++++++++++++---
drivers/vfio/platform/vfio_platform_private.h | 1 +
2 files changed, 53 insertions(+), 5 deletions(-)
diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c
index 6be92c3..fbf4565 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
+static int vfio_platform_acpi_probe(struct vfio_platform_device *vdev,
+ struct device *dev)
+{
+ 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
+static inline int vfio_platform_acpi_probe(struct vfio_platform_device *vdev,
+ struct device *dev)
+{
+ return -ENOENT;
+}
+#endif
+
static bool vfio_platform_has_reset(struct vfio_platform_device *vdev)
{
return vdev->of_reset ? true : false;
@@ -547,6 +579,20 @@ 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;
+}
+
int vfio_platform_probe_common(struct vfio_platform_device *vdev,
struct device *dev)
{
@@ -556,11 +602,12 @@ 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;
--
1.8.2.1
next prev parent reply other threads:[~2016-05-28 22:03 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1464472878-27176-1-git-send-email-okaya@codeaurora.org>
2016-05-28 22:01 ` [PATCH V6 1/8] vfio: platform: move reset call to a common function Sinan Kaya
2016-05-28 22:01 ` [PATCH V6 2/8] vfio: platform: determine reset capability Sinan Kaya
2016-05-28 22:01 ` Sinan Kaya [this message]
2016-05-28 22:01 ` [PATCH V6 4/8] vfio: platform: add extra debug info argument to call reset Sinan Kaya
2016-05-28 22:01 ` [PATCH V6 5/8] vfio: platform: call _RST method when using ACPI Sinan Kaya
2016-06-07 20:14 ` Auger Eric
2016-06-08 22:31 ` Rafael J. Wysocki
2016-06-09 2:33 ` Sinan Kaya
2016-06-13 3:41 ` Sinan Kaya
2016-05-28 22:01 ` [PATCH V6 6/8] vfio, platform: make reset driver a requirement by default Sinan Kaya
2016-06-07 19:59 ` Auger Eric
2016-06-13 2:32 ` Sinan Kaya
2016-05-28 22:01 ` [PATCH V6 7/8] vfio: platform: check reset call return code during open Sinan Kaya
2016-06-07 20:21 ` Auger Eric
2016-06-13 3:12 ` Sinan Kaya
2016-05-28 22:01 ` [PATCH V6 8/8] vfio: platform: check reset call return code during release Sinan Kaya
2016-06-07 20:28 ` Auger Eric
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1464472878-27176-4-git-send-email-okaya@codeaurora.org \
--to=okaya@codeaurora.org \
--cc=agross@codeaurora.org \
--cc=alex.williamson@redhat.com \
--cc=b.reynal@virtualopensystems.com \
--cc=cov@codeaurora.org \
--cc=eric.auger@linaro.org \
--cc=jcm@redhat.com \
--cc=kvm@vger.kernel.org \
--cc=linux-acpi@vger.kernel.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-arm-msm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=timur@codeaurora.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).