diff mbox series

[v4,15/16] dmaengine: idxd: add pid to exported sysfs attribute for opened file

Message ID 20230407203143.2189681-16-fenghua.yu@intel.com (mailing list archive)
State Accepted
Commit a62b8f87c770fa4109ce515e4d8a0d4701a4ca5f
Headers show
Series Enable DSA 2.0 Event Log and completion record faulting features | expand

Commit Message

Fenghua Yu April 7, 2023, 8:31 p.m. UTC 
From: Dave Jiang <dave.jiang@intel.com>

Provide the pid of the application for the opened file. This allows the
monitor daemon to easily correlate which app opened the file and easily
kill the app by pid if that is desired action.

Tested-by: Tony Zhu <tony.zhu@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Co-developed-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
---
 Documentation/ABI/stable/sysfs-driver-dma-idxd |  8 ++++++++
 drivers/dma/idxd/cdev.c                        | 11 +++++++++++
 2 files changed, 19 insertions(+)
diff mbox series

Patch

diff --git a/Documentation/ABI/stable/sysfs-driver-dma-idxd b/Documentation/ABI/stable/sysfs-driver-dma-idxd
index 73ab86196a41..5d0df57f5298 100644
--- a/Documentation/ABI/stable/sysfs-driver-dma-idxd
+++ b/Documentation/ABI/stable/sysfs-driver-dma-idxd
@@ -335,3 +335,11 @@  Description:	Show the number of Completion Record (CR) faults failures that this
 		driver cannot fault in the address for the CR. Typically this is caused
 		by a bad address programmed in the submitted descriptor or a malicious
 		submitter is using bad CR address on purpose.
+
+What:		/sys/bus/dsa/devices/wq<m>.<n>/dsa<x>\!wq<m>.<n>/file<y>/pid
+Date:		Sept 14, 2022
+KernelVersion:	6.4.0
+Contact:	dmaengine@vger.kernel.org
+Description:	Show the process id of the application that opened the file. This is
+		helpful information for a monitor daemon that wants to kill the
+		application that opened the file.
diff --git a/drivers/dma/idxd/cdev.c b/drivers/dma/idxd/cdev.c
index 2fb905f2545b..ecbf67c2ad2b 100644
--- a/drivers/dma/idxd/cdev.c
+++ b/drivers/dma/idxd/cdev.c
@@ -49,6 +49,7 @@  struct idxd_user_context {
 	struct idxd_dev idxd_dev;
 	u64 counters[COUNTER_MAX];
 	int id;
+	pid_t pid;
 };
 
 static void idxd_cdev_evl_drain_pasid(struct idxd_wq *wq, u32 pasid);
@@ -78,9 +79,18 @@  static ssize_t cr_fault_failures_show(struct device *dev,
 }
 static DEVICE_ATTR_RO(cr_fault_failures);
 
+static ssize_t pid_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct idxd_user_context *ctx = dev_to_uctx(dev);
+
+	return sysfs_emit(buf, "%u\n", ctx->pid);
+}
+static DEVICE_ATTR_RO(pid);
+
 static struct attribute *cdev_file_attributes[] = {
 	&dev_attr_cr_faults.attr,
 	&dev_attr_cr_fault_failures.attr,
+	&dev_attr_pid.attr,
 	NULL
 };
 
@@ -238,6 +248,7 @@  static int idxd_cdev_open(struct inode *inode, struct file *filp)
 
 	ctx->wq = wq;
 	filp->private_data = ctx;
+	ctx->pid = current->pid;
 
 	if (device_user_pasid_enabled(idxd)) {
 		sva = iommu_sva_bind_device(dev, current->mm);