[PATCH 1/2] dmaengine: idxd: Fix max batch size for Intel IAA

[Xiaochen Shen <xiaochen.shen@intel.com>]

From Intel IAA spec [1], Intel IAA does not support batch processing.

Two batch related default values for IAA are incorrect in current code:
(1) The max batch size of device is set during device initialization,
    that indicates batch is supported. It should be always 0 on IAA.
(2) The max batch size of work queue is set to WQ_DEFAULT_MAX_BATCH (32)
    as the default value regardless of Intel DSA or IAA device during
    work queue setup and cleanup. It should be always 0 on IAA.

Fix the issues by setting the max batch size of device and max batch
size of work queue to 0 on IAA device, that means batch is not
supported.

[1]: https://cdrdv2.intel.com/v1/dl/getContent/721858

Fixes: 23084545dbb0 ("dmaengine: idxd: set max_xfer and max_batch for RO device")
Fixes: 92452a72ebdf ("dmaengine: idxd: set defaults for wq configs")
Fixes: bfe1d56091c1 ("dmaengine: idxd: Init and probe for Intel data accelerators")
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Fenghua Yu <fenghua.yu@intel.com>
---
 drivers/dma/idxd/device.c |  6 +++---
 drivers/dma/idxd/idxd.h   | 32 ++++++++++++++++++++++++++++++++
 drivers/dma/idxd/init.c   |  4 ++--
 drivers/dma/idxd/sysfs.c  |  2 +-
 4 files changed, 38 insertions(+), 6 deletions(-)

diff --git a/drivers/dma/idxd/device.c b/drivers/dma/idxd/device.c
index 5a8cc52c1abf..cc7aabe4dc84 100644
--- a/drivers/dma/idxd/device.c
+++ b/drivers/dma/idxd/device.c
@@ -388,7 +388,7 @@ static void idxd_wq_disable_cleanup(struct idxd_wq *wq)
 	clear_bit(WQ_FLAG_BLOCK_ON_FAULT, &wq->flags);
 	memset(wq->name, 0, WQ_NAME_SIZE);
 	wq->max_xfer_bytes = WQ_DEFAULT_MAX_XFER;
-	wq->max_batch_size = WQ_DEFAULT_MAX_BATCH;
+	idxd_wq_set_max_batch_size(idxd->data->type, wq, WQ_DEFAULT_MAX_BATCH);
 }
 
 static void idxd_wq_device_reset_cleanup(struct idxd_wq *wq)
@@ -863,7 +863,7 @@ static int idxd_wq_config_write(struct idxd_wq *wq)
 
 	/* bytes 12-15 */
 	wq->wqcfg->max_xfer_shift = ilog2(wq->max_xfer_bytes);
-	wq->wqcfg->max_batch_shift = ilog2(wq->max_batch_size);
+	idxd_wqcfg_set_max_batch_shift(idxd->data->type, wq->wqcfg, ilog2(wq->max_batch_size));
 
 	dev_dbg(dev, "WQ %d CFGs\n", wq->id);
 	for (i = 0; i < WQCFG_STRIDES(idxd); i++) {
@@ -1031,7 +1031,7 @@ static int idxd_wq_load_config(struct idxd_wq *wq)
 	wq->priority = wq->wqcfg->priority;
 
 	wq->max_xfer_bytes = 1ULL << wq->wqcfg->max_xfer_shift;
-	wq->max_batch_size = 1ULL << wq->wqcfg->max_batch_shift;
+	idxd_wq_set_max_batch_size(idxd->data->type, wq, 1U << wq->wqcfg->max_batch_shift);
 
 	for (i = 0; i < WQCFG_STRIDES(idxd); i++) {
 		wqcfg_offset = WQCFG_OFFSET(idxd, wq->id, i);
diff --git a/drivers/dma/idxd/idxd.h b/drivers/dma/idxd/idxd.h
index fed0dfc1eaa8..c1617416d379 100644
--- a/drivers/dma/idxd/idxd.h
+++ b/drivers/dma/idxd/idxd.h
@@ -540,6 +540,38 @@ static inline int idxd_wq_refcount(struct idxd_wq *wq)
 	return wq->client_count;
 };
 
+/*
+ * Intel IAA does not support batch processing.
+ * The max batch size of device, max batch size of wq and
+ * max batch shift of wqcfg should be always 0 on IAA.
+ */
+static inline void idxd_set_max_batch_size(int idxd_type, struct idxd_device *idxd,
+					   u32 max_batch_size)
+{
+	if (idxd_type == IDXD_TYPE_IAX)
+		idxd->max_batch_size = 0;
+	else
+		idxd->max_batch_size = max_batch_size;
+}
+
+static inline void idxd_wq_set_max_batch_size(int idxd_type, struct idxd_wq *wq,
+					      u32 max_batch_size)
+{
+	if (idxd_type == IDXD_TYPE_IAX)
+		wq->max_batch_size = 0;
+	else
+		wq->max_batch_size = max_batch_size;
+}
+
+static inline void idxd_wqcfg_set_max_batch_shift(int idxd_type, union wqcfg *wqcfg,
+						  u32 max_batch_shift)
+{
+	if (idxd_type == IDXD_TYPE_IAX)
+		wqcfg->max_batch_shift = 0;
+	else
+		wqcfg->max_batch_shift = max_batch_shift;
+}
+
 int __must_check __idxd_driver_register(struct idxd_device_driver *idxd_drv,
 					struct module *module, const char *mod_name);
 #define idxd_driver_register(driver) \
diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c
index aa3478257ddb..6d03849c698b 100644
--- a/drivers/dma/idxd/init.c
+++ b/drivers/dma/idxd/init.c
@@ -177,7 +177,7 @@ static int idxd_setup_wqs(struct idxd_device *idxd)
 		init_completion(&wq->wq_dead);
 		init_completion(&wq->wq_resurrect);
 		wq->max_xfer_bytes = WQ_DEFAULT_MAX_XFER;
-		wq->max_batch_size = WQ_DEFAULT_MAX_BATCH;
+		idxd_wq_set_max_batch_size(idxd->data->type, wq, WQ_DEFAULT_MAX_BATCH);
 		wq->enqcmds_retries = IDXD_ENQCMDS_RETRIES;
 		wq->wqcfg = kzalloc_node(idxd->wqcfg_size, GFP_KERNEL, dev_to_node(dev));
 		if (!wq->wqcfg) {
@@ -389,7 +389,7 @@ static void idxd_read_caps(struct idxd_device *idxd)
 
 	idxd->max_xfer_bytes = 1ULL << idxd->hw.gen_cap.max_xfer_shift;
 	dev_dbg(dev, "max xfer size: %llu bytes\n", idxd->max_xfer_bytes);
-	idxd->max_batch_size = 1U << idxd->hw.gen_cap.max_batch_shift;
+	idxd_set_max_batch_size(idxd->data->type, idxd, 1U << idxd->hw.gen_cap.max_batch_shift);
 	dev_dbg(dev, "max batch size: %u\n", idxd->max_batch_size);
 	if (idxd->hw.gen_cap.config_en)
 		set_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags);
diff --git a/drivers/dma/idxd/sysfs.c b/drivers/dma/idxd/sysfs.c
index 3f262a57441b..fa729fac4b97 100644
--- a/drivers/dma/idxd/sysfs.c
+++ b/drivers/dma/idxd/sysfs.c
@@ -961,7 +961,7 @@ static ssize_t wq_max_batch_size_store(struct device *dev, struct device_attribu
 	if (batch_size > idxd->max_batch_size)
 		return -EINVAL;
 
-	wq->max_batch_size = (u32)batch_size;
+	idxd_wq_set_max_batch_size(idxd->data->type, wq, (u32)batch_size);
 
 	return count;
 }
-- 
2.18.4