[PATCH v3 2/7] vfio/ccw: Remove mdev from struct channel_program

[Jason Gunthorpe <jgg@nvidia.com>]

The next patch wants the vfio_device instead. There is no reason to store
a pointer here since we can container_of back to the vfio_device.

Reviewed-by: Eric Farman <farman@linux.ibm.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/s390/cio/vfio_ccw_cp.c  | 47 ++++++++++++++++++++-------------
 drivers/s390/cio/vfio_ccw_cp.h  |  4 +--
 drivers/s390/cio/vfio_ccw_fsm.c |  3 +--
 3 files changed, 30 insertions(+), 24 deletions(-)

diff --git a/drivers/s390/cio/vfio_ccw_cp.c b/drivers/s390/cio/vfio_ccw_cp.c
index 8d1b2771c1aa02..7a1cf3091cd647 100644
--- a/drivers/s390/cio/vfio_ccw_cp.c
+++ b/drivers/s390/cio/vfio_ccw_cp.c
@@ -16,6 +16,7 @@
 #include <asm/idals.h>
 
 #include "vfio_ccw_cp.h"
+#include "vfio_ccw_private.h"
 
 struct pfn_array {
 	/* Starting guest physical I/O address. */
@@ -98,17 +99,17 @@ static int pfn_array_alloc(struct pfn_array *pa, u64 iova, unsigned int len)
  * If the pin request partially succeeds, or fails completely,
  * all pages are left unpinned and a negative error value is returned.
  */
-static int pfn_array_pin(struct pfn_array *pa, struct device *mdev)
+static int pfn_array_pin(struct pfn_array *pa, struct vfio_device *vdev)
 {
 	int ret = 0;
 
-	ret = vfio_pin_pages(mdev, pa->pa_iova_pfn, pa->pa_nr,
+	ret = vfio_pin_pages(vdev->dev, pa->pa_iova_pfn, pa->pa_nr,
 			     IOMMU_READ | IOMMU_WRITE, pa->pa_pfn);
 
 	if (ret < 0) {
 		goto err_out;
 	} else if (ret > 0 && ret != pa->pa_nr) {
-		vfio_unpin_pages(mdev, pa->pa_iova_pfn, ret);
+		vfio_unpin_pages(vdev->dev, pa->pa_iova_pfn, ret);
 		ret = -EINVAL;
 		goto err_out;
 	}
@@ -122,11 +123,11 @@ static int pfn_array_pin(struct pfn_array *pa, struct device *mdev)
 }
 
 /* Unpin the pages before releasing the memory. */
-static void pfn_array_unpin_free(struct pfn_array *pa, struct device *mdev)
+static void pfn_array_unpin_free(struct pfn_array *pa, struct vfio_device *vdev)
 {
 	/* Only unpin if any pages were pinned to begin with */
 	if (pa->pa_nr)
-		vfio_unpin_pages(mdev, pa->pa_iova_pfn, pa->pa_nr);
+		vfio_unpin_pages(vdev->dev, pa->pa_iova_pfn, pa->pa_nr);
 	pa->pa_nr = 0;
 	kfree(pa->pa_iova_pfn);
 }
@@ -190,8 +191,7 @@ static void convert_ccw0_to_ccw1(struct ccw1 *source, unsigned long len)
  * Within the domain (@mdev), copy @n bytes from a guest physical
  * address (@iova) to a host physical address (@to).
  */
-static long copy_from_iova(struct device *mdev,
-			   void *to, u64 iova,
+static long copy_from_iova(struct vfio_device *vdev, void *to, u64 iova,
 			   unsigned long n)
 {
 	struct pfn_array pa = {0};
@@ -203,9 +203,9 @@ static long copy_from_iova(struct device *mdev,
 	if (ret < 0)
 		return ret;
 
-	ret = pfn_array_pin(&pa, mdev);
+	ret = pfn_array_pin(&pa, vdev);
 	if (ret < 0) {
-		pfn_array_unpin_free(&pa, mdev);
+		pfn_array_unpin_free(&pa, vdev);
 		return ret;
 	}
 
@@ -226,7 +226,7 @@ static long copy_from_iova(struct device *mdev,
 			break;
 	}
 
-	pfn_array_unpin_free(&pa, mdev);
+	pfn_array_unpin_free(&pa, vdev);
 
 	return l;
 }
@@ -423,11 +423,13 @@ static int ccwchain_loop_tic(struct ccwchain *chain,
 
 static int ccwchain_handle_ccw(u32 cda, struct channel_program *cp)
 {
+	struct vfio_device *vdev =
+		&container_of(cp, struct vfio_ccw_private, cp)->vdev;
 	struct ccwchain *chain;
 	int len, ret;
 
 	/* Copy 2K (the most we support today) of possible CCWs */
-	len = copy_from_iova(cp->mdev, cp->guest_cp, cda,
+	len = copy_from_iova(vdev, cp->guest_cp, cda,
 			     CCWCHAIN_LEN_MAX * sizeof(struct ccw1));
 	if (len)
 		return len;
@@ -508,6 +510,8 @@ static int ccwchain_fetch_direct(struct ccwchain *chain,
 				 int idx,
 				 struct channel_program *cp)
 {
+	struct vfio_device *vdev =
+		&container_of(cp, struct vfio_ccw_private, cp)->vdev;
 	struct ccw1 *ccw;
 	struct pfn_array *pa;
 	u64 iova;
@@ -526,7 +530,7 @@ static int ccwchain_fetch_direct(struct ccwchain *chain,
 	if (ccw_is_idal(ccw)) {
 		/* Read first IDAW to see if it's 4K-aligned or not. */
 		/* All subsequent IDAws will be 4K-aligned. */
-		ret = copy_from_iova(cp->mdev, &iova, ccw->cda, sizeof(iova));
+		ret = copy_from_iova(vdev, &iova, ccw->cda, sizeof(iova));
 		if (ret)
 			return ret;
 	} else {
@@ -555,7 +559,7 @@ static int ccwchain_fetch_direct(struct ccwchain *chain,
 
 	if (ccw_is_idal(ccw)) {
 		/* Copy guest IDAL into host IDAL */
-		ret = copy_from_iova(cp->mdev, idaws, ccw->cda, idal_len);
+		ret = copy_from_iova(vdev, idaws, ccw->cda, idal_len);
 		if (ret)
 			goto out_unpin;
 
@@ -574,7 +578,7 @@ static int ccwchain_fetch_direct(struct ccwchain *chain,
 	}
 
 	if (ccw_does_data_transfer(ccw)) {
-		ret = pfn_array_pin(pa, cp->mdev);
+		ret = pfn_array_pin(pa, vdev);
 		if (ret < 0)
 			goto out_unpin;
 	} else {
@@ -590,7 +594,7 @@ static int ccwchain_fetch_direct(struct ccwchain *chain,
 	return 0;
 
 out_unpin:
-	pfn_array_unpin_free(pa, cp->mdev);
+	pfn_array_unpin_free(pa, vdev);
 out_free_idaws:
 	kfree(idaws);
 out_init:
@@ -632,8 +636,10 @@ static int ccwchain_fetch_one(struct ccwchain *chain,
  * Returns:
  *   %0 on success and a negative error value on failure.
  */
-int cp_init(struct channel_program *cp, struct device *mdev, union orb *orb)
+int cp_init(struct channel_program *cp, union orb *orb)
 {
+	struct vfio_device *vdev =
+		&container_of(cp, struct vfio_ccw_private, cp)->vdev;
 	/* custom ratelimit used to avoid flood during guest IPL */
 	static DEFINE_RATELIMIT_STATE(ratelimit_state, 5 * HZ, 1);
 	int ret;
@@ -650,11 +656,12 @@ int cp_init(struct channel_program *cp, struct device *mdev, union orb *orb)
 	 * the problem if something does break.
 	 */
 	if (!orb->cmd.pfch && __ratelimit(&ratelimit_state))
-		dev_warn(mdev, "Prefetching channel program even though prefetch not specified in ORB");
+		dev_warn(
+			vdev->dev,
+			"Prefetching channel program even though prefetch not specified in ORB");
 
 	INIT_LIST_HEAD(&cp->ccwchain_list);
 	memcpy(&cp->orb, orb, sizeof(*orb));
-	cp->mdev = mdev;
 
 	/* Build a ccwchain for the first CCW segment */
 	ret = ccwchain_handle_ccw(orb->cmd.cpa, cp);
@@ -682,6 +689,8 @@ int cp_init(struct channel_program *cp, struct device *mdev, union orb *orb)
  */
 void cp_free(struct channel_program *cp)
 {
+	struct vfio_device *vdev =
+		&container_of(cp, struct vfio_ccw_private, cp)->vdev;
 	struct ccwchain *chain, *temp;
 	int i;
 
@@ -691,7 +700,7 @@ void cp_free(struct channel_program *cp)
 	cp->initialized = false;
 	list_for_each_entry_safe(chain, temp, &cp->ccwchain_list, next) {
 		for (i = 0; i < chain->ch_len; i++) {
-			pfn_array_unpin_free(chain->ch_pa + i, cp->mdev);
+			pfn_array_unpin_free(chain->ch_pa + i, vdev);
 			ccwchain_cda_free(chain, i);
 		}
 		ccwchain_free(chain);
diff --git a/drivers/s390/cio/vfio_ccw_cp.h b/drivers/s390/cio/vfio_ccw_cp.h
index ba31240ce96594..e4c436199b4cda 100644
--- a/drivers/s390/cio/vfio_ccw_cp.h
+++ b/drivers/s390/cio/vfio_ccw_cp.h
@@ -37,13 +37,11 @@
 struct channel_program {
 	struct list_head ccwchain_list;
 	union orb orb;
-	struct device *mdev;
 	bool initialized;
 	struct ccw1 *guest_cp;
 };
 
-extern int cp_init(struct channel_program *cp, struct device *mdev,
-		   union orb *orb);
+extern int cp_init(struct channel_program *cp, union orb *orb);
 extern void cp_free(struct channel_program *cp);
 extern int cp_prefetch(struct channel_program *cp);
 extern union orb *cp_get_orb(struct channel_program *cp, u32 intparm, u8 lpm);
diff --git a/drivers/s390/cio/vfio_ccw_fsm.c b/drivers/s390/cio/vfio_ccw_fsm.c
index e435a9cd92dacf..8483a266051c21 100644
--- a/drivers/s390/cio/vfio_ccw_fsm.c
+++ b/drivers/s390/cio/vfio_ccw_fsm.c
@@ -262,8 +262,7 @@ static void fsm_io_request(struct vfio_ccw_private *private,
 			errstr = "transport mode";
 			goto err_out;
 		}
-		io_region->ret_code = cp_init(&private->cp, mdev_dev(mdev),
-					      orb);
+		io_region->ret_code = cp_init(&private->cp, orb);
 		if (io_region->ret_code) {
 			VFIO_CCW_MSG_EVENT(2,
 					   "%pUl (%x.%x.%04x): cp_init=%d\n",
-- 
2.36.0