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dmaengine: idxd: Fix max batch size for Intel IAA

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>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: 23084545db ("dmaengine: idxd: set max_xfer and max_batch for RO device")
Fixes: 92452a72eb ("dmaengine: idxd: set defaults for wq configs")
Fixes: bfe1d56091 ("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>
Link: https://lore.kernel.org/r/20220930201528.18621-2-xiaochen.shen@intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Xiaochen Shen 2022-10-01 04:15:27 +08:00 committed by Vinod Koul
parent b3d726cb84
commit e8dbd6445d
4 changed files with 38 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/dma/idxd/device.c
View File

@ -390,7 +390,7 @@ static void idxd_wq_disable_cleanup(struct idxd_wq *wq)
clear_bit(WQ_FLAG_ATS_DISABLE, &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);
if (wq->opcap_bmap)
bitmap_copy(wq->opcap_bmap, idxd->opcap_bmap, IDXD_MAX_OPCAP_BITS);
}
@ -869,7 +869,7 @@ 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));
/* bytes 32-63 */
if (idxd->hw.wq_cap.op_config && wq->opcap_bmap) {
@ -1051,7 +1051,7 @@ 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);

32
drivers/dma/idxd/idxd.h
View File

@ -548,6 +548,38 @@ 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) \

4
drivers/dma/idxd/init.c
View File

@ -183,7 +183,7 @@ 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) {
@ -418,7 +418,7 @@ 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);

2
drivers/dma/idxd/sysfs.c
View File

@ -1046,7 +1046,7 @@ 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;
}