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[SCSI] mpt2sas: Added multisegment mode support for Linux BSG Driver
Added support for Block IO requests with multiple segments (vectors) in the SMP handler of the SAS Transport Class. This is required by the BSG driver. Multisegment support added for both, Request and Response. Signed-off-by: Nagalakshmi Nandigama <nagalakshmi.nandigama@lsi.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
nagalakshmi.nandigama@lsi.com
James Bottomley
parent
913809f6e7
commit
77a6edffdf
@ -1828,7 +1828,7 @@ _transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
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struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);
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Mpi2SmpPassthroughRequest_t *mpi_request;
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Mpi2SmpPassthroughReply_t *mpi_reply;
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int rc;
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int rc, i;
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u16 smid;
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u32 ioc_state;
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unsigned long timeleft;
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@ -1837,24 +1837,20 @@ _transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
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u8 issue_reset = 0;
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dma_addr_t dma_addr_in = 0;
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dma_addr_t dma_addr_out = 0;
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dma_addr_t pci_dma_in = 0;
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dma_addr_t pci_dma_out = 0;
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void *pci_addr_in = NULL;
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void *pci_addr_out = NULL;
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u16 wait_state_count;
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struct request *rsp = req->next_rq;
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struct bio_vec *bvec = NULL;
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if (!rsp) {
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printk(MPT2SAS_ERR_FMT "%s: the smp response space is "
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"missing\n", ioc->name, __func__);
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return -EINVAL;
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}
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/* do we need to support multiple segments? */
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if (req->bio->bi_vcnt > 1 || rsp->bio->bi_vcnt > 1) {
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printk(MPT2SAS_ERR_FMT "%s: multiple segments req %u %u, "
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"rsp %u %u\n", ioc->name, __func__, req->bio->bi_vcnt,
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blk_rq_bytes(req), rsp->bio->bi_vcnt, blk_rq_bytes(rsp));
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return -EINVAL;
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}
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if (ioc->shost_recovery) {
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if (ioc->shost_recovery || ioc->pci_error_recovery) {
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printk(MPT2SAS_INFO_FMT "%s: host reset in progress!\n",
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__func__, ioc->name);
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return -EFAULT;
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@ -1872,6 +1868,59 @@ _transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
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}
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ioc->transport_cmds.status = MPT2_CMD_PENDING;
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/* Check if the request is split across multiple segments */
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if (req->bio->bi_vcnt > 1) {
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u32 offset = 0;
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/* Allocate memory and copy the request */
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pci_addr_out = pci_alloc_consistent(ioc->pdev,
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blk_rq_bytes(req), &pci_dma_out);
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if (!pci_addr_out) {
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printk(MPT2SAS_INFO_FMT "%s(): PCI Addr out = NULL\n",
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ioc->name, __func__);
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rc = -ENOMEM;
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goto out;
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}
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bio_for_each_segment(bvec, req->bio, i) {
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memcpy(pci_addr_out + offset,
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page_address(bvec->bv_page) + bvec->bv_offset,
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bvec->bv_len);
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offset += bvec->bv_len;
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}
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} else {
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dma_addr_out = pci_map_single(ioc->pdev, bio_data(req->bio),
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blk_rq_bytes(req), PCI_DMA_BIDIRECTIONAL);
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if (!dma_addr_out) {
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printk(MPT2SAS_INFO_FMT "%s(): DMA Addr out = NULL\n",
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ioc->name, __func__);
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rc = -ENOMEM;
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goto free_pci;
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}
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}
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/* Check if the response needs to be populated across
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* multiple segments */
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if (rsp->bio->bi_vcnt > 1) {
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pci_addr_in = pci_alloc_consistent(ioc->pdev, blk_rq_bytes(rsp),
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&pci_dma_in);
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if (!pci_addr_in) {
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printk(MPT2SAS_INFO_FMT "%s(): PCI Addr in = NULL\n",
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ioc->name, __func__);
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rc = -ENOMEM;
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goto unmap;
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}
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} else {
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dma_addr_in = pci_map_single(ioc->pdev, bio_data(rsp->bio),
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blk_rq_bytes(rsp), PCI_DMA_BIDIRECTIONAL);
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if (!dma_addr_in) {
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printk(MPT2SAS_INFO_FMT "%s(): DMA Addr in = NULL\n",
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ioc->name, __func__);
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rc = -ENOMEM;
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goto unmap;
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}
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}
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wait_state_count = 0;
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ioc_state = mpt2sas_base_get_iocstate(ioc, 1);
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while (ioc_state != MPI2_IOC_STATE_OPERATIONAL) {
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@ -1880,7 +1929,7 @@ _transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
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"%s: failed due to ioc not operational\n",
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ioc->name, __func__);
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rc = -EFAULT;
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goto out;
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goto unmap;
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}
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ssleep(1);
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ioc_state = mpt2sas_base_get_iocstate(ioc, 1);
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@ -1897,7 +1946,7 @@ _transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
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printk(MPT2SAS_ERR_FMT "%s: failed obtaining a smid\n",
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ioc->name, __func__);
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rc = -EAGAIN;
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goto out;
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goto unmap;
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}
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rc = 0;
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@ -1919,16 +1968,14 @@ _transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
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sgl_flags = (MPI2_SGE_FLAGS_SIMPLE_ELEMENT |
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MPI2_SGE_FLAGS_END_OF_BUFFER | MPI2_SGE_FLAGS_HOST_TO_IOC);
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sgl_flags = sgl_flags << MPI2_SGE_FLAGS_SHIFT;
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dma_addr_out = pci_map_single(ioc->pdev, bio_data(req->bio),
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blk_rq_bytes(req), PCI_DMA_BIDIRECTIONAL);
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if (!dma_addr_out) {
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mpt2sas_base_free_smid(ioc, smid);
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goto unmap;
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if (req->bio->bi_vcnt > 1) {
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ioc->base_add_sg_single(psge, sgl_flags |
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(blk_rq_bytes(req) - 4), pci_dma_out);
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} else {
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ioc->base_add_sg_single(psge, sgl_flags |
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(blk_rq_bytes(req) - 4), dma_addr_out);
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}
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ioc->base_add_sg_single(psge, sgl_flags | (blk_rq_bytes(req) - 4),
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dma_addr_out);
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/* incr sgel */
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psge += ioc->sge_size;
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@ -1937,16 +1984,14 @@ _transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
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MPI2_SGE_FLAGS_LAST_ELEMENT | MPI2_SGE_FLAGS_END_OF_BUFFER |
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MPI2_SGE_FLAGS_END_OF_LIST);
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sgl_flags = sgl_flags << MPI2_SGE_FLAGS_SHIFT;
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dma_addr_in = pci_map_single(ioc->pdev, bio_data(rsp->bio),
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blk_rq_bytes(rsp), PCI_DMA_BIDIRECTIONAL);
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if (!dma_addr_in) {
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mpt2sas_base_free_smid(ioc, smid);
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goto unmap;
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if (rsp->bio->bi_vcnt > 1) {
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ioc->base_add_sg_single(psge, sgl_flags |
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(blk_rq_bytes(rsp) + 4), pci_dma_in);
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} else {
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ioc->base_add_sg_single(psge, sgl_flags |
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(blk_rq_bytes(rsp) + 4), dma_addr_in);
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}
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ioc->base_add_sg_single(psge, sgl_flags | (blk_rq_bytes(rsp) + 4),
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dma_addr_in);
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dtransportprintk(ioc, printk(MPT2SAS_INFO_FMT "%s - "
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"sending smp request\n", ioc->name, __func__));
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@ -1982,6 +2027,27 @@ _transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
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req->resid_len = 0;
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rsp->resid_len -=
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le16_to_cpu(mpi_reply->ResponseDataLength);
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/* check if the resp needs to be copied from the allocated
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* pci mem */
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if (rsp->bio->bi_vcnt > 1) {
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u32 offset = 0;
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u32 bytes_to_copy =
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le16_to_cpu(mpi_reply->ResponseDataLength);
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bio_for_each_segment(bvec, rsp->bio, i) {
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if (bytes_to_copy <= bvec->bv_len) {
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memcpy(page_address(bvec->bv_page) +
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bvec->bv_offset, pci_addr_in +
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offset, bytes_to_copy);
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break;
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} else {
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memcpy(page_address(bvec->bv_page) +
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bvec->bv_offset, pci_addr_in +
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offset, bvec->bv_len);
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bytes_to_copy -= bvec->bv_len;
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}
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offset += bvec->bv_len;
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}
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}
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} else {
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dtransportprintk(ioc, printk(MPT2SAS_INFO_FMT
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"%s - no reply\n", ioc->name, __func__));
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@ -2003,6 +2069,15 @@ _transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
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pci_unmap_single(ioc->pdev, dma_addr_in, blk_rq_bytes(rsp),
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PCI_DMA_BIDIRECTIONAL);
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free_pci:
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if (pci_addr_out)
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pci_free_consistent(ioc->pdev, blk_rq_bytes(req), pci_addr_out,
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pci_dma_out);
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if (pci_addr_in)
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pci_free_consistent(ioc->pdev, blk_rq_bytes(rsp), pci_addr_in,
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pci_dma_in);
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out:
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ioc->transport_cmds.status = MPT2_CMD_NOT_USED;
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mutex_unlock(&ioc->transport_cmds.mutex);
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