[PATCH v4 21/23] amdkfd: Implement the Set Memory Policy IOCTL

[Oded Gabbay <oded.gabbay@xxxxxxx>]

From: Andrew Lewycky <Andrew.Lewycky@xxxxxxx>

Signed-off-by: Andrew Lewycky <Andrew.Lewycky@xxxxxxx>
Signed-off-by: Oded Gabbay <oded.gabbay@xxxxxxx>
---
 drivers/gpu/drm/radeon/amdkfd/kfd_chardev.c | 51 ++++++++++++++++++++++++++++-
 1 file changed, 50 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/radeon/amdkfd/kfd_chardev.c b/drivers/gpu/drm/radeon/amdkfd/kfd_chardev.c
index ac3146d..d1cc6d8 100644
--- a/drivers/gpu/drm/radeon/amdkfd/kfd_chardev.c
+++ b/drivers/gpu/drm/radeon/amdkfd/kfd_chardev.c
@@ -35,6 +35,7 @@
 #include <uapi/asm-generic/mman-common.h>
 #include <asm/processor.h>
 #include "kfd_priv.h"
+#include "kfd_device_queue_manager.h"
 
 static long kfd_ioctl(struct file *, unsigned int, unsigned long);
 static int kfd_open(struct inode *, struct file *);
@@ -319,7 +320,55 @@ static int kfd_ioctl_update_queue(struct file *filp, struct kfd_process *p, void
 
 static long kfd_ioctl_set_memory_policy(struct file *filep, struct kfd_process *p, void __user *arg)
 {
-	return -ENODEV;
+	struct kfd_ioctl_set_memory_policy_args args;
+	struct kfd_dev *dev;
+	int err = 0;
+	struct kfd_process_device *pdd;
+	enum cache_policy default_policy, alternate_policy;
+
+	if (copy_from_user(&args, arg, sizeof(args)))
+		return -EFAULT;
+
+	if (args.default_policy != KFD_IOC_CACHE_POLICY_COHERENT
+	    && args.default_policy != KFD_IOC_CACHE_POLICY_NONCOHERENT) {
+		return -EINVAL;
+	}
+
+	if (args.alternate_policy != KFD_IOC_CACHE_POLICY_COHERENT
+	    && args.alternate_policy != KFD_IOC_CACHE_POLICY_NONCOHERENT) {
+		return -EINVAL;
+	}
+
+	dev = kfd_device_by_id(args.gpu_id);
+	if (dev == NULL)
+		return -EINVAL;
+
+	mutex_lock(&p->mutex);
+
+	pdd = kfd_bind_process_to_device(dev, p);
+	if (IS_ERR(pdd) < 0) {
+		err = PTR_ERR(pdd);
+		goto out;
+	}
+
+	default_policy = (args.default_policy == KFD_IOC_CACHE_POLICY_COHERENT)
+			 ? cache_policy_coherent : cache_policy_noncoherent;
+
+	alternate_policy = (args.alternate_policy == KFD_IOC_CACHE_POLICY_COHERENT)
+			   ? cache_policy_coherent : cache_policy_noncoherent;
+
+	if (!dev->dqm->set_cache_memory_policy(dev->dqm,
+					 &pdd->qpd,
+					 default_policy,
+					 alternate_policy,
+					 (void __user *)args.alternate_aperture_base,
+					 args.alternate_aperture_size))
+		err = -EINVAL;
+
+out:
+	mutex_unlock(&p->mutex);
+
+	return err;
 }
 
 static long kfd_ioctl_get_clock_counters(struct file *filep, struct kfd_process *p, void __user *arg)
-- 
1.9.1

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