[PATCH V3 1/1] drm/amd/amdgpu: Release xcp drm memory after unplug

[Meng Li]

Add a new API amdgpu_xcp_drm_dev_free().
After unplug xcp device, need to release xcp drm memory etc.

Co-developed-by: Jiang Liu <ge...@linux.alibaba.com>
Signed-off-by: Jiang Liu <ge...@linux.alibaba.com>
Signed-off-by: Meng Li <li.m...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_xcp.c     |  1 +
 drivers/gpu/drm/amd/amdxcp/amdgpu_xcp_drv.c | 60 +++++++++++++++++----
 drivers/gpu/drm/amd/amdxcp/amdgpu_xcp_drv.h |  1 +
 3 files changed, 53 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_xcp.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_xcp.c
index 322816805bfb..70c44961af95 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_xcp.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_xcp.c
@@ -394,6 +394,7 @@ void amdgpu_xcp_dev_unplug(struct amdgpu_device *adev)
                p_ddev->primary->dev = adev->xcp_mgr->xcp[i].pdev;
                p_ddev->driver =  adev->xcp_mgr->xcp[i].driver;
                p_ddev->vma_offset_manager = 
adev->xcp_mgr->xcp[i].vma_offset_manager;
+               amdgpu_xcp_drm_dev_free(p_ddev);
        }
 }
 
diff --git a/drivers/gpu/drm/amd/amdxcp/amdgpu_xcp_drv.c 
b/drivers/gpu/drm/amd/amdxcp/amdgpu_xcp_drv.c
index faed84172dd4..3a8f3dd19a12 100644
--- a/drivers/gpu/drm/amd/amdxcp/amdgpu_xcp_drv.c
+++ b/drivers/gpu/drm/amd/amdxcp/amdgpu_xcp_drv.c
@@ -45,18 +45,29 @@ static const struct drm_driver amdgpu_xcp_driver = {
 
 static int8_t pdev_num;
 static struct xcp_device *xcp_dev[MAX_XCP_PLATFORM_DEVICE];
+static DEFINE_MUTEX(xcp_mutex);
 
 int amdgpu_xcp_drm_dev_alloc(struct drm_device **ddev)
 {
        struct platform_device *pdev;
        struct xcp_device *pxcp_dev;
        char dev_name[20];
-       int ret;
+       int ret, i;
+
+       guard(mutex)(&xcp_mutex);
 
        if (pdev_num >= MAX_XCP_PLATFORM_DEVICE)
                return -ENODEV;
 
-       snprintf(dev_name, sizeof(dev_name), "amdgpu_xcp_%d", pdev_num);
+       for (i = 0; i < MAX_XCP_PLATFORM_DEVICE; i++) {
+               if (!xcp_dev[i])
+                       break;
+       }
+
+       if (i >= MAX_XCP_PLATFORM_DEVICE)
+               return -ENODEV;
+
+       snprintf(dev_name, sizeof(dev_name), "amdgpu_xcp_%d", i);
        pdev = platform_device_register_simple(dev_name, -1, NULL, 0);
        if (IS_ERR(pdev))
                return PTR_ERR(pdev);
@@ -72,8 +83,8 @@ int amdgpu_xcp_drm_dev_alloc(struct drm_device **ddev)
                goto out_devres;
        }
 
-       xcp_dev[pdev_num] = pxcp_dev;
-       xcp_dev[pdev_num]->pdev = pdev;
+       xcp_dev[i] = pxcp_dev;
+       xcp_dev[i]->pdev = pdev;
        *ddev = &pxcp_dev->drm;
        pdev_num++;
 
@@ -88,16 +99,47 @@ int amdgpu_xcp_drm_dev_alloc(struct drm_device **ddev)
 }
 EXPORT_SYMBOL(amdgpu_xcp_drm_dev_alloc);
 
-void amdgpu_xcp_drv_release(void)
+static void free_xcp_dev(int8_t index)
 {
-       for (--pdev_num; pdev_num >= 0; --pdev_num) {
-               struct platform_device *pdev = xcp_dev[pdev_num]->pdev;
+       if ((index < MAX_XCP_PLATFORM_DEVICE) && (xcp_dev[index])) {
+               struct platform_device *pdev = xcp_dev[index]->pdev;
 
                devres_release_group(&pdev->dev, NULL);
                platform_device_unregister(pdev);
-               xcp_dev[pdev_num] = NULL;
+
+               xcp_dev[index] = NULL;
+               pdev_num--;
+       }
+}
+
+void amdgpu_xcp_drm_dev_free(struct drm_device *ddev)
+{
+       int8_t i = MAX_XCP_PLATFORM_DEVICE;
+
+       guard(mutex)(&xcp_mutex);
+
+       for (i = 0; i < MAX_XCP_PLATFORM_DEVICE; i++) {
+               if ((xcp_dev[i]) && (&xcp_dev[i]->drm == ddev)) {
+                       free_xcp_dev(i);
+                       break;
+               }
+       }
+}
+EXPORT_SYMBOL(amdgpu_xcp_drm_dev_free);
+
+void amdgpu_xcp_drv_release(void)
+{
+       int8_t i = 0;
+
+       guard(mutex)(&xcp_mutex);
+
+       if (pdev_num > 0) {
+               for (i = 0; i < MAX_XCP_PLATFORM_DEVICE; i++) {
+                       free_xcp_dev(i);
+                       if (pdev_num == 0)
+                               break;
+               }
        }
-       pdev_num = 0;
 }
 EXPORT_SYMBOL(amdgpu_xcp_drv_release);
 
diff --git a/drivers/gpu/drm/amd/amdxcp/amdgpu_xcp_drv.h 
b/drivers/gpu/drm/amd/amdxcp/amdgpu_xcp_drv.h
index c1c4b679bf95..580a1602c8e3 100644
--- a/drivers/gpu/drm/amd/amdxcp/amdgpu_xcp_drv.h
+++ b/drivers/gpu/drm/amd/amdxcp/amdgpu_xcp_drv.h
@@ -25,5 +25,6 @@
 #define _AMDGPU_XCP_DRV_H_
 
 int amdgpu_xcp_drm_dev_alloc(struct drm_device **ddev);
+void amdgpu_xcp_drm_dev_free(struct drm_device *ddev);
 void amdgpu_xcp_drv_release(void);
 #endif /* _AMDGPU_XCP_DRV_H_ */
-- 
2.43.0