drm/i915/gvt: pass a struct intel_vgpu to the vfio read/write helpers

Pass the structure we actually care about instead of deriving it from
the mdev_device in the lower level code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Zhi Wang <zhi.a.wang@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20220411141403.86980-27-hch@lst.de
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Zhi Wang <zhi.a.wang@intel.com>

diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index 11bce3a..5db74b6 100644 (file)
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -1007,10 +1007,9 @@ static int intel_vgpu_aperture_rw(struct intel_vgpu *vgpu, u64 off,
        return 0;
 }
 
-static ssize_t intel_vgpu_rw(struct mdev_device *mdev, char *buf,
+static ssize_t intel_vgpu_rw(struct intel_vgpu *vgpu, char *buf,
                        size_t count, loff_t *ppos, bool is_write)
 {
-       struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
        unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos);
        u64 pos = *ppos & VFIO_PCI_OFFSET_MASK;
        int ret = -EINVAL;
@@ -1056,9 +1055,8 @@ static ssize_t intel_vgpu_rw(struct mdev_device *mdev, char *buf,
        return ret == 0 ? count : ret;
 }
 
-static bool gtt_entry(struct mdev_device *mdev, loff_t *ppos)
+static bool gtt_entry(struct intel_vgpu *vgpu, loff_t *ppos)
 {
-       struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
        unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos);
        struct intel_gvt *gvt = vgpu->gvt;
        int offset;
@@ -1078,6 +1076,7 @@ static bool gtt_entry(struct mdev_device *mdev, loff_t *ppos)
 static ssize_t intel_vgpu_read(struct mdev_device *mdev, char __user *buf,
                        size_t count, loff_t *ppos)
 {
+       struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
        unsigned int done = 0;
        int ret;
 
@@ -1086,10 +1085,10 @@ static ssize_t intel_vgpu_read(struct mdev_device *mdev, char __user *buf,
 
                /* Only support GGTT entry 8 bytes read */
                if (count >= 8 && !(*ppos % 8) &&
-                       gtt_entry(mdev, ppos)) {
+                       gtt_entry(vgpu, ppos)) {
                        u64 val;
 
-                       ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
+                       ret = intel_vgpu_rw(vgpu, (char *)&val, sizeof(val),
                                        ppos, false);
                        if (ret <= 0)
                                goto read_err;
@@ -1101,7 +1100,7 @@ static ssize_t intel_vgpu_read(struct mdev_device *mdev, char __user *buf,
                } else if (count >= 4 && !(*ppos % 4)) {
                        u32 val;
 
-                       ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
+                       ret = intel_vgpu_rw(vgpu, (char *)&val, sizeof(val),
                                        ppos, false);
                        if (ret <= 0)
                                goto read_err;
@@ -1113,7 +1112,7 @@ static ssize_t intel_vgpu_read(struct mdev_device *mdev, char __user *buf,
                } else if (count >= 2 && !(*ppos % 2)) {
                        u16 val;
 
-                       ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
+                       ret = intel_vgpu_rw(vgpu, (char *)&val, sizeof(val),
                                        ppos, false);
                        if (ret <= 0)
                                goto read_err;
@@ -1125,7 +1124,7 @@ static ssize_t intel_vgpu_read(struct mdev_device *mdev, char __user *buf,
                } else {
                        u8 val;
 
-                       ret = intel_vgpu_rw(mdev, &val, sizeof(val), ppos,
+                       ret = intel_vgpu_rw(vgpu, &val, sizeof(val), ppos,
                                        false);
                        if (ret <= 0)
                                goto read_err;
@@ -1152,6 +1151,7 @@ static ssize_t intel_vgpu_write(struct mdev_device *mdev,
                                const char __user *buf,
                                size_t count, loff_t *ppos)
 {
+       struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
        unsigned int done = 0;
        int ret;
 
@@ -1160,13 +1160,13 @@ static ssize_t intel_vgpu_write(struct mdev_device *mdev,
 
                /* Only support GGTT entry 8 bytes write */
                if (count >= 8 && !(*ppos % 8) &&
-                       gtt_entry(mdev, ppos)) {
+                       gtt_entry(vgpu, ppos)) {
                        u64 val;
 
                        if (copy_from_user(&val, buf, sizeof(val)))
                                goto write_err;
 
-                       ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
+                       ret = intel_vgpu_rw(vgpu, (char *)&val, sizeof(val),
                                        ppos, true);
                        if (ret <= 0)
                                goto write_err;
@@ -1178,7 +1178,7 @@ static ssize_t intel_vgpu_write(struct mdev_device *mdev,
                        if (copy_from_user(&val, buf, sizeof(val)))
                                goto write_err;
 
-                       ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
+                       ret = intel_vgpu_rw(vgpu, (char *)&val, sizeof(val),
                                        ppos, true);
                        if (ret <= 0)
                                goto write_err;
@@ -1190,7 +1190,7 @@ static ssize_t intel_vgpu_write(struct mdev_device *mdev,
                        if (copy_from_user(&val, buf, sizeof(val)))
                                goto write_err;
 
-                       ret = intel_vgpu_rw(mdev, (char *)&val,
+                       ret = intel_vgpu_rw(vgpu, (char *)&val,
                                        sizeof(val), ppos, true);
                        if (ret <= 0)
                                goto write_err;
@@ -1202,7 +1202,7 @@ static ssize_t intel_vgpu_write(struct mdev_device *mdev,
                        if (copy_from_user(&val, buf, sizeof(val)))
                                goto write_err;
 
-                       ret = intel_vgpu_rw(mdev, &val, sizeof(val),
+                       ret = intel_vgpu_rw(vgpu, &val, sizeof(val),
                                        ppos, true);
                        if (ret <= 0)
                                goto write_err;