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Message-ID: <20240409170137.79197-3-sudanl@amazon.com>
Date: Tue, 9 Apr 2024 18:01:34 +0100
From: Sudan Landge <sudanl@...zon.com>
To: <tytso@....edu>, <Jason@...c4.com>, <robh+dt@...nel.org>,
<krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
<sudanl@...zon.com>, <sathyanarayanan.kuppuswamy@...ux.intel.com>,
<thomas.lendacky@....com>, <dan.j.williams@...el.com>,
<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: <graf@...zon.de>, <dwmw@...zon.co.uk>, <bchalios@...zon.es>,
<xmarcalx@...zon.co.uk>
Subject: [PATCH v4 2/5] virt: vmgenid: change implementation to use a platform driver
Re-implement vmgenid as a platform driver in preparation
for adding devicetree bindings support in next commits.
Signed-off-by: Sudan Landge <sudanl@...zon.com>
---
drivers/virt/vmgenid.c | 97 +++++++++++++++++++++++++++++-------------
1 file changed, 67 insertions(+), 30 deletions(-)
diff --git a/drivers/virt/vmgenid.c b/drivers/virt/vmgenid.c
index a167ccfad299..c028e2064fdd 100644
--- a/drivers/virt/vmgenid.c
+++ b/drivers/virt/vmgenid.c
@@ -7,9 +7,10 @@
* information to random.c.
*/
+#include <linux/acpi.h>
#include <linux/kernel.h>
#include <linux/module.h>
-#include <linux/acpi.h>
+#include <linux/platform_device.h>
#include <linux/random.h>
ACPI_MODULE_NAME("vmgenid");
@@ -21,9 +22,9 @@ struct vmgenid_state {
u8 this_id[VMGENID_SIZE];
};
-static void vmgenid_notify(struct acpi_device *device, u32 event)
+static void vmgenid_notify(struct device *device)
{
- struct vmgenid_state *state = acpi_driver_data(device);
+ struct vmgenid_state *state = device->driver_data;
char *envp[] = { "NEW_VMGENID=1", NULL };
u8 old_id[VMGENID_SIZE];
@@ -32,21 +33,36 @@ static void vmgenid_notify(struct acpi_device *device, u32 event)
if (!memcmp(old_id, state->this_id, sizeof(old_id)))
return;
add_vmfork_randomness(state->this_id, sizeof(state->this_id));
- kobject_uevent_env(&device->dev.kobj, KOBJ_CHANGE, envp);
+ kobject_uevent_env(&device->kobj, KOBJ_CHANGE, envp);
+}
+
+static void vmgenid_acpi_handler(acpi_handle __always_unused handle,
+ u32 __always_unused event, void *dev)
+{
+ vmgenid_notify(dev);
+}
+
+static int setup_vmgenid_state(struct vmgenid_state *state, u8 *next_id)
+{
+ if (IS_ERR(next_id))
+ return PTR_ERR(next_id);
+
+ state->next_id = next_id;
+ memcpy(state->this_id, state->next_id, sizeof(state->this_id));
+ add_device_randomness(state->this_id, sizeof(state->this_id));
+ return 0;
}
-static int vmgenid_add(struct acpi_device *device)
+static int vmgenid_add_acpi(struct device *dev,
+ struct vmgenid_state *state)
{
+ struct acpi_device *device = ACPI_COMPANION(dev);
struct acpi_buffer parsed = { ACPI_ALLOCATE_BUFFER };
- struct vmgenid_state *state;
union acpi_object *obj;
phys_addr_t phys_addr;
acpi_status status;
int ret = 0;
-
- state = devm_kmalloc(&device->dev, sizeof(*state), GFP_KERNEL);
- if (!state)
- return -ENOMEM;
+ u8 *virt_addr;
status = acpi_evaluate_object(device->handle, "ADDR", NULL, &parsed);
if (ACPI_FAILURE(status)) {
@@ -63,40 +79,61 @@ static int vmgenid_add(struct acpi_device *device)
phys_addr = (obj->package.elements[0].integer.value << 0) |
(obj->package.elements[1].integer.value << 32);
- state->next_id = devm_memremap(&device->dev, phys_addr, VMGENID_SIZE, MEMREMAP_WB);
- if (IS_ERR(state->next_id)) {
- ret = PTR_ERR(state->next_id);
+
+ virt_addr = (u8 *)devm_memremap(&device->dev, phys_addr,
+ VMGENID_SIZE, MEMREMAP_WB);
+ ret = setup_vmgenid_state(state, virt_addr);
+ if (ret)
+ goto out;
+
+ dev->driver_data = state;
+ status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
+ vmgenid_acpi_handler, dev);
+ if (ACPI_FAILURE(status)) {
+ dev_err(dev, "Failed to install acpi notify handler");
+ ret = -ENODEV;
+ dev->driver_data = NULL;
goto out;
}
+out:
+ ACPI_FREE(parsed.pointer);
+ return ret;
+}
- memcpy(state->this_id, state->next_id, sizeof(state->this_id));
- add_device_randomness(state->this_id, sizeof(state->this_id));
+static int vmgenid_add(struct platform_device *pdev)
+{
+ struct vmgenid_state *state;
+ struct device *dev = &pdev->dev;
+ int ret = 0;
- device->driver_data = state;
+ state = devm_kmalloc(dev, sizeof(*state), GFP_KERNEL);
+ if (!state)
+ return -ENOMEM;
+
+ ret = vmgenid_add_acpi(dev, state);
+
+ if (ret)
+ devm_kfree(dev, state);
-out:
- ACPI_FREE(parsed.pointer);
return ret;
}
-static const struct acpi_device_id vmgenid_ids[] = {
+static const struct acpi_device_id vmgenid_acpi_ids[] = {
{ "VMGENCTR", 0 },
{ "VM_GEN_COUNTER", 0 },
{ }
};
-MODULE_DEVICE_TABLE(acpi, vmgenid_ids);
-
-static struct acpi_driver vmgenid_driver = {
- .name = "vmgenid",
- .ids = vmgenid_ids,
- .owner = THIS_MODULE,
- .ops = {
- .add = vmgenid_add,
- .notify = vmgenid_notify
- }
+MODULE_DEVICE_TABLE(acpi, vmgenid_acpi_ids);
+
+static struct platform_driver vmgenid_plaform_driver = {
+ .probe = vmgenid_add,
+ .driver = {
+ .name = "vmgenid",
+ .acpi_match_table = vmgenid_acpi_ids,
+ },
};
-module_acpi_driver(vmgenid_driver);
+module_platform_driver(vmgenid_plaform_driver)
MODULE_DESCRIPTION("Virtual Machine Generation ID");
MODULE_LICENSE("GPL v2");
--
2.34.1
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