forked from Minki/linux
skd: Reduce memory usage
Every single coherent DMA memory buffer occupies at least one page. Reduce memory usage by switching from coherent buffers to streaming DMA for I/O requests (struct skd_fitmsg_context) and S/G-lists (struct fit_sg_descriptor[]). Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.de> Cc: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Bart Van Assche
Jens Axboe
parent
d4d0f5fc3a
commit
a3db102def
@ -32,6 +32,7 @@
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#include <linux/aer.h>
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#include <linux/wait.h>
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#include <linux/stringify.h>
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#include <linux/slab_def.h>
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#include <scsi/scsi.h>
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#include <scsi/sg.h>
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#include <linux/io.h>
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@ -256,6 +257,9 @@ struct skd_device {
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u8 skcomp_cycle;
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u32 skcomp_ix;
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struct kmem_cache *msgbuf_cache;
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struct kmem_cache *sglist_cache;
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struct kmem_cache *databuf_cache;
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struct fit_completion_entry_v1 *skcomp_table;
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struct fit_comp_error_info *skerr_table;
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dma_addr_t cq_dma_address;
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@ -538,6 +542,11 @@ static void skd_process_request(struct request *req, bool last)
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return;
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}
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dma_sync_single_for_device(&skdev->pdev->dev, skreq->sksg_dma_address,
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skreq->n_sg *
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sizeof(struct fit_sg_descriptor),
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DMA_TO_DEVICE);
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spin_lock_irqsave(&skdev->lock, flags);
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/* Either a FIT msg is in progress or we have to start one. */
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skmsg = skdev->skmsg;
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@ -1078,6 +1087,11 @@ static void skd_complete_internal(struct skd_device *skdev,
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dev_dbg(&skdev->pdev->dev, "complete internal %x\n", scsi->cdb[0]);
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dma_sync_single_for_cpu(&skdev->pdev->dev,
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skspcl->db_dma_address,
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skspcl->req.sksg_list[0].byte_count,
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DMA_BIDIRECTIONAL);
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skspcl->req.completion = *skcomp;
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skspcl->req.state = SKD_REQ_STATE_IDLE;
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skspcl->req.id += SKD_ID_INCR;
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@ -1263,6 +1277,9 @@ static void skd_send_fitmsg(struct skd_device *skdev,
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*/
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qcmd |= FIT_QCMD_MSGSIZE_64;
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dma_sync_single_for_device(&skdev->pdev->dev, skmsg->mb_dma_address,
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skmsg->length, DMA_TO_DEVICE);
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/* Make sure skd_msg_buf is written before the doorbell is triggered. */
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smp_wmb();
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@ -1274,6 +1291,8 @@ static void skd_send_special_fitmsg(struct skd_device *skdev,
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{
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u64 qcmd;
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WARN_ON_ONCE(skspcl->req.n_sg != 1);
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if (unlikely(skdev->dbg_level > 1)) {
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u8 *bp = (u8 *)skspcl->msg_buf;
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int i;
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@ -1307,6 +1326,17 @@ static void skd_send_special_fitmsg(struct skd_device *skdev,
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qcmd = skspcl->mb_dma_address;
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qcmd |= FIT_QCMD_QID_NORMAL + FIT_QCMD_MSGSIZE_128;
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dma_sync_single_for_device(&skdev->pdev->dev, skspcl->mb_dma_address,
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SKD_N_SPECIAL_FITMSG_BYTES, DMA_TO_DEVICE);
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dma_sync_single_for_device(&skdev->pdev->dev,
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skspcl->req.sksg_dma_address,
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1 * sizeof(struct fit_sg_descriptor),
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DMA_TO_DEVICE);
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dma_sync_single_for_device(&skdev->pdev->dev,
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skspcl->db_dma_address,
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skspcl->req.sksg_list[0].byte_count,
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DMA_BIDIRECTIONAL);
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/* Make sure skd_msg_buf is written before the doorbell is triggered. */
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smp_wmb();
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@ -2619,6 +2649,35 @@ static void skd_release_irq(struct skd_device *skdev)
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*****************************************************************************
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*/
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static void *skd_alloc_dma(struct skd_device *skdev, struct kmem_cache *s,
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dma_addr_t *dma_handle, gfp_t gfp,
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enum dma_data_direction dir)
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{
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struct device *dev = &skdev->pdev->dev;
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void *buf;
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buf = kmem_cache_alloc(s, gfp);
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if (!buf)
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return NULL;
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*dma_handle = dma_map_single(dev, buf, s->size, dir);
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if (dma_mapping_error(dev, *dma_handle)) {
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kfree(buf);
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buf = NULL;
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}
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return buf;
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}
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static void skd_free_dma(struct skd_device *skdev, struct kmem_cache *s,
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void *vaddr, dma_addr_t dma_handle,
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enum dma_data_direction dir)
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{
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if (!vaddr)
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return;
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dma_unmap_single(&skdev->pdev->dev, dma_handle, s->size, dir);
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kmem_cache_free(s, vaddr);
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}
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static int skd_cons_skcomp(struct skd_device *skdev)
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{
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int rc = 0;
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@ -2695,18 +2754,14 @@ static struct fit_sg_descriptor *skd_cons_sg_list(struct skd_device *skdev,
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dma_addr_t *ret_dma_addr)
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{
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struct fit_sg_descriptor *sg_list;
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u32 nbytes;
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nbytes = sizeof(*sg_list) * n_sg;
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sg_list = pci_alloc_consistent(skdev->pdev, nbytes, ret_dma_addr);
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sg_list = skd_alloc_dma(skdev, skdev->sglist_cache, ret_dma_addr,
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GFP_DMA | __GFP_ZERO, DMA_TO_DEVICE);
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if (sg_list != NULL) {
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uint64_t dma_address = *ret_dma_addr;
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u32 i;
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memset(sg_list, 0, nbytes);
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for (i = 0; i < n_sg - 1; i++) {
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uint64_t ndp_off;
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ndp_off = (i + 1) * sizeof(struct fit_sg_descriptor);
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@ -2720,15 +2775,14 @@ static struct fit_sg_descriptor *skd_cons_sg_list(struct skd_device *skdev,
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}
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static void skd_free_sg_list(struct skd_device *skdev,
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struct fit_sg_descriptor *sg_list, u32 n_sg,
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struct fit_sg_descriptor *sg_list,
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dma_addr_t dma_addr)
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{
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u32 nbytes = sizeof(*sg_list) * n_sg;
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if (WARN_ON_ONCE(!sg_list))
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return;
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pci_free_consistent(skdev->pdev, nbytes, sg_list, dma_addr);
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skd_free_dma(skdev, skdev->sglist_cache, sg_list, dma_addr,
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DMA_TO_DEVICE);
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}
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static int skd_init_request(struct blk_mq_tag_set *set, struct request *rq,
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@ -2752,34 +2806,31 @@ static void skd_exit_request(struct blk_mq_tag_set *set, struct request *rq,
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struct skd_device *skdev = set->driver_data;
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struct skd_request_context *skreq = blk_mq_rq_to_pdu(rq);
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skd_free_sg_list(skdev, skreq->sksg_list,
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skdev->sgs_per_request,
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skreq->sksg_dma_address);
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skd_free_sg_list(skdev, skreq->sksg_list, skreq->sksg_dma_address);
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}
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static int skd_cons_sksb(struct skd_device *skdev)
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{
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int rc = 0;
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struct skd_special_context *skspcl;
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u32 nbytes;
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skspcl = &skdev->internal_skspcl;
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skspcl->req.id = 0 + SKD_ID_INTERNAL;
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skspcl->req.state = SKD_REQ_STATE_IDLE;
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nbytes = SKD_N_INTERNAL_BYTES;
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skspcl->data_buf = pci_zalloc_consistent(skdev->pdev, nbytes,
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&skspcl->db_dma_address);
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skspcl->data_buf = skd_alloc_dma(skdev, skdev->databuf_cache,
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&skspcl->db_dma_address,
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GFP_DMA | __GFP_ZERO,
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DMA_BIDIRECTIONAL);
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if (skspcl->data_buf == NULL) {
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rc = -ENOMEM;
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goto err_out;
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}
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nbytes = SKD_N_SPECIAL_FITMSG_BYTES;
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skspcl->msg_buf = pci_zalloc_consistent(skdev->pdev, nbytes,
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&skspcl->mb_dma_address);
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skspcl->msg_buf = skd_alloc_dma(skdev, skdev->msgbuf_cache,
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&skspcl->mb_dma_address,
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GFP_DMA | __GFP_ZERO, DMA_TO_DEVICE);
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if (skspcl->msg_buf == NULL) {
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rc = -ENOMEM;
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goto err_out;
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@ -2886,6 +2937,7 @@ static struct skd_device *skd_construct(struct pci_dev *pdev)
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{
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struct skd_device *skdev;
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int blk_major = skd_major;
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size_t size;
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int rc;
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skdev = kzalloc(sizeof(*skdev), GFP_KERNEL);
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@ -2914,6 +2966,31 @@ static struct skd_device *skd_construct(struct pci_dev *pdev)
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INIT_WORK(&skdev->start_queue, skd_start_queue);
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INIT_WORK(&skdev->completion_worker, skd_completion_worker);
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size = max(SKD_N_FITMSG_BYTES, SKD_N_SPECIAL_FITMSG_BYTES);
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skdev->msgbuf_cache = kmem_cache_create("skd-msgbuf", size, 0,
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SLAB_HWCACHE_ALIGN, NULL);
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if (!skdev->msgbuf_cache)
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goto err_out;
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WARN_ONCE(kmem_cache_size(skdev->msgbuf_cache) < size,
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"skd-msgbuf: %d < %zd\n",
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kmem_cache_size(skdev->msgbuf_cache), size);
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size = skd_sgs_per_request * sizeof(struct fit_sg_descriptor);
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skdev->sglist_cache = kmem_cache_create("skd-sglist", size, 0,
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SLAB_HWCACHE_ALIGN, NULL);
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if (!skdev->sglist_cache)
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goto err_out;
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WARN_ONCE(kmem_cache_size(skdev->sglist_cache) < size,
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"skd-sglist: %d < %zd\n",
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kmem_cache_size(skdev->sglist_cache), size);
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size = SKD_N_INTERNAL_BYTES;
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skdev->databuf_cache = kmem_cache_create("skd-databuf", size, 0,
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SLAB_HWCACHE_ALIGN, NULL);
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if (!skdev->databuf_cache)
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goto err_out;
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WARN_ONCE(kmem_cache_size(skdev->databuf_cache) < size,
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"skd-databuf: %d < %zd\n",
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kmem_cache_size(skdev->databuf_cache), size);
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dev_dbg(&skdev->pdev->dev, "skcomp\n");
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rc = skd_cons_skcomp(skdev);
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if (rc < 0)
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@ -2986,31 +3063,21 @@ static void skd_free_skmsg(struct skd_device *skdev)
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static void skd_free_sksb(struct skd_device *skdev)
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{
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struct skd_special_context *skspcl;
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u32 nbytes;
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struct skd_special_context *skspcl = &skdev->internal_skspcl;
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skspcl = &skdev->internal_skspcl;
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if (skspcl->data_buf != NULL) {
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nbytes = SKD_N_INTERNAL_BYTES;
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pci_free_consistent(skdev->pdev, nbytes,
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skspcl->data_buf, skspcl->db_dma_address);
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}
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skd_free_dma(skdev, skdev->databuf_cache, skspcl->data_buf,
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skspcl->db_dma_address, DMA_BIDIRECTIONAL);
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skspcl->data_buf = NULL;
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skspcl->db_dma_address = 0;
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if (skspcl->msg_buf != NULL) {
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nbytes = SKD_N_SPECIAL_FITMSG_BYTES;
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pci_free_consistent(skdev->pdev, nbytes,
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skspcl->msg_buf, skspcl->mb_dma_address);
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}
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skd_free_dma(skdev, skdev->msgbuf_cache, skspcl->msg_buf,
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skspcl->mb_dma_address, DMA_TO_DEVICE);
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skspcl->msg_buf = NULL;
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skspcl->mb_dma_address = 0;
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skd_free_sg_list(skdev, skspcl->req.sksg_list, 1,
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skd_free_sg_list(skdev, skspcl->req.sksg_list,
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skspcl->req.sksg_dma_address);
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skspcl->req.sksg_list = NULL;
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@ -3056,6 +3123,10 @@ static void skd_destruct(struct skd_device *skdev)
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dev_dbg(&skdev->pdev->dev, "skcomp\n");
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skd_free_skcomp(skdev);
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kmem_cache_destroy(skdev->databuf_cache);
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kmem_cache_destroy(skdev->sglist_cache);
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kmem_cache_destroy(skdev->msgbuf_cache);
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dev_dbg(&skdev->pdev->dev, "skdev\n");
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kfree(skdev);
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}
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