[PATCH v2 11/21] scsi: ipr, pmcraid, isci: Make use of the new sg_map helper

Logan Gunthorpe
2017-04-25T18:20:58Z

Very straightforward conversion of three scsi drivers.

Signed-off-by: Logan Gunthorpe <logang-OTvnGxWRz7hWk0Htik3J/w@public.gmane.org>
Cc: Brian King <brking-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
Cc: Artur Paszkiewicz <artur.paszkiewicz-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
---
drivers/scsi/ipr.c | 27 ++++++++++++++-------------
drivers/scsi/isci/request.c | 42 +++++++++++++++++++++++++-----------------
drivers/scsi/pmcraid.c | 19 ++++++++++++-------
3 files changed, 51 insertions(+), 37 deletions(-)

diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index b0c68d2..b2324e1 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -3895,7 +3895,7 @@ static void ipr_free_ucode_buffer(struct ipr_sglist *sglist)
static int ipr_copy_ucode_buffer(struct ipr_sglist *sglist,
u8 *buffer, u32 len)
{
- int bsize_elem, i, result = 0;
+ int bsize_elem, i;
struct scatterlist *scatterlist;
void *kaddr;

@@ -3905,32 +3905,33 @@ static int ipr_copy_ucode_buffer(struct ipr_sglist *sglist,
scatterlist = sglist->scatterlist;

for (i = 0; i < (len / bsize_elem); i++, buffer += bsize_elem) {
- struct page *page = sg_page(&scatterlist[i]);
+ kaddr = sg_map(&scatterlist[i], 0, SG_KMAP);
+ if (IS_ERR(kaddr)) {
+ ipr_trace;
+ return PTR_ERR(kaddr);
+ }

- kaddr = kmap(page);
memcpy(kaddr, buffer, bsize_elem);
- kunmap(page);
+ sg_unmap(&scatterlist[i], kaddr, 0, SG_KMAP);

scatterlist[i].length = bsize_elem;
-
- if (result != 0) {
- ipr_trace;
- return result;
- }
}

if (len % bsize_elem) {
- struct page *page = sg_page(&scatterlist[i]);
+ kaddr = sg_map(&scatterlist[i], 0, SG_KMAP);
+ if (IS_ERR(kaddr)) {
+ ipr_trace;
+ return PTR_ERR(kaddr);
+ }

- kaddr = kmap(page);
memcpy(kaddr, buffer, len % bsize_elem);
- kunmap(page);
+ sg_unmap(&scatterlist[i], kaddr, 0, SG_KMAP);

scatterlist[i].length = len % bsize_elem;
}

sglist->buffer_len = len;
- return result;
+ return 0;
}

/**
diff --git a/drivers/scsi/isci/request.c b/drivers/scsi/isci/request.c
index 47f66e9..6f5521b 100644
--- a/drivers/scsi/isci/request.c
+++ b/drivers/scsi/isci/request.c
@@ -1424,12 +1424,14 @@ sci_stp_request_pio_data_in_copy_data_buffer(struct isci_stp_request *stp_req,
sg = task->scatter;

while (total_len > 0) {
- struct page *page = sg_page(sg);
-
copy_len = min_t(int, total_len, sg_dma_len(sg));
- kaddr = kmap_atomic(page);
- memcpy(kaddr + sg->offset, src_addr, copy_len);
- kunmap_atomic(kaddr);
+ kaddr = sg_map(sg, 0, SG_KMAP_ATOMIC);
+ if (IS_ERR(kaddr))
+ return SCI_FAILURE;
+
+ memcpy(kaddr, src_addr, copy_len);
+ sg_unmap(sg, kaddr, 0, SG_KMAP_ATOMIC);
+
total_len -= copy_len;
src_addr += copy_len;
sg = sg_next(sg);
@@ -1771,14 +1773,16 @@ sci_io_request_frame_handler(struct isci_request *ireq,
case SCI_REQ_SMP_WAIT_RESP: {
struct sas_task *task = isci_request_access_task(ireq);
struct scatterlist *sg = &task->smp_task.smp_resp;
- void *frame_header, *kaddr;
+ void *frame_header;
u8 *rsp;

sci_unsolicited_frame_control_get_header(&ihost->uf_control,
frame_index,
&frame_header);
- kaddr = kmap_atomic(sg_page(sg));
- rsp = kaddr + sg->offset;
+ rsp = sg_map(sg, 0, SG_KMAP_ATOMIC);
+ if (IS_ERR(rsp))
+ return SCI_FAILURE;
+
sci_swab32_cpy(rsp, frame_header, 1);

if (rsp[0] == SMP_RESPONSE) {
@@ -1814,7 +1818,7 @@ sci_io_request_frame_handler(struct isci_request *ireq,
ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
}
- kunmap_atomic(kaddr);
+ sg_unmap(sg, rsp, 0, SG_KMAP_ATOMIC);

sci_controller_release_frame(ihost, frame_index);

@@ -2919,15 +2923,18 @@ static void isci_request_io_request_complete(struct isci_host *ihost,
case SAS_PROTOCOL_SMP: {
struct scatterlist *sg = &task->smp_task.smp_req;
struct smp_req *smp_req;
- void *kaddr;

dma_unmap_sg(&ihost->pdev->dev, sg, 1, DMA_TO_DEVICE);

/* need to swab it back in case the command buffer is re-used */
- kaddr = kmap_atomic(sg_page(sg));
- smp_req = kaddr + sg->offset;
+ smp_req = sg_map(sg, 0, SG_KMAP_ATOMIC);
+ if (IS_ERR(smp_req)) {
+ status = SAS_ABORTED_TASK;
+ break;
+ }
+
sci_swab32_cpy(smp_req, smp_req, sg->length / sizeof(u32));
- kunmap_atomic(kaddr);
+ sg_unmap(sg, smp_req, 0, SG_KMAP_ATOMIC);
break;
}
default:
@@ -3190,12 +3197,13 @@ sci_io_request_construct_smp(struct device *dev,
struct scu_task_context *task_context;
struct isci_port *iport;
struct smp_req *smp_req;
- void *kaddr;
u8 req_len;
u32 cmd;

- kaddr = kmap_atomic(sg_page(sg));
- smp_req = kaddr + sg->offset;
+ smp_req = sg_map(sg, 0, SG_KMAP_ATOMIC);
+ if (IS_ERR(smp_req))
+ return SCI_FAILURE;
+
/*
* Look at the SMP requests' header fields; for certain SAS 1.x SMP
* functions under SAS 2.0, a zero request length really indicates
@@ -3220,7 +3228,7 @@ sci_io_request_construct_smp(struct device *dev,
req_len = smp_req->req_len;
sci_swab32_cpy(smp_req, smp_req, sg->length / sizeof(u32));
cmd = *(u32 *) smp_req;
- kunmap_atomic(kaddr);
+ sg_unmap(sg, smp_req, 0, SG_KMAP_ATOMIC);

if (!dma_map_sg(dev, sg, 1, DMA_TO_DEVICE))
return SCI_FAILURE;
diff --git a/drivers/scsi/pmcraid.c b/drivers/scsi/pmcraid.c
index 49e70a3..e0d041a 100644
--- a/drivers/scsi/pmcraid.c
+++ b/drivers/scsi/pmcraid.c
@@ -3342,9 +3342,12 @@ static int pmcraid_copy_sglist(
scatterlist = sglist->scatterlist;

for (i = 0; i < (len / bsize_elem); i++, buffer += bsize_elem) {
- struct page *page = sg_page(&scatterlist[i]);
+ kaddr = sg_map(&scatterlist[i], 0, SG_KMAP);
+ if (IS_ERR(kaddr)) {
+ pmcraid_err("failed to copy user data into sg list\n");
+ return PTR_ERR(kaddr);
+ }

- kaddr = kmap(page);
if (direction == DMA_TO_DEVICE)
rc = __copy_from_user(kaddr,
(void *)buffer,
@@ -3352,7 +3355,7 @@ static int pmcraid_copy_sglist(
else
rc = __copy_to_user((void *)buffer, kaddr, bsize_elem);

- kunmap(page);
+ sg_unmap(&scatterlist[i], kaddr, 0, SG_KMAP);

if (rc) {
pmcraid_err("failed to copy user data into sg list\n");
@@ -3363,9 +3366,11 @@ static int pmcraid_copy_sglist(
}

if (len % bsize_elem) {
- struct page *page = sg_page(&scatterlist[i]);
-
- kaddr = kmap(page);
+ kaddr = sg_map(&scatterlist[i], 0, SG_KMAP);
+ if (IS_ERR(kaddr)) {
+ pmcraid_err("failed to copy user data into sg list\n");
+ return PTR_ERR(kaddr);
+ }

if (direction == DMA_TO_DEVICE)
rc = __copy_from_user(kaddr,
@@ -3376,7 +3381,7 @@ static int pmcraid_copy_sglist(
kaddr,
len % bsize_elem);

- kunmap(page);
+ sg_unmap(&scatterlist[i], kaddr, 0, SG_KMAP);

scatterlist[i].length = len % bsize_elem;
}
--
2.1.4