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scsi: ipr: Replace kmap() with kmap_local_page()

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The use of kmap() is deprecated in favor of kmap_local_page().

There are two main problems with kmap(): (1) It comes with an overhead as
the mapping space is restricted and protected by a global lock for
synchronization and (2) it also requires global TLB invalidation when the
kmap’s pool wraps and it might block when the mapping space is fully
utilized until a slot becomes available.

With kmap_local_page() the mappings are per thread, CPU local, can take
page faults, and can be called from any context (including interrupts).  It
is faster than kmap() in kernels with HIGHMEM enabled. Furthermore, the
tasks can be preempted and, when they are scheduled to run again, the
kernel virtual addresses are restored and still valid.

Therefore, replace kmap() with kmap_local_page() in ipr_copy_ucode_buffer()
and, instead of open-coding local mappings + memcpy() + local un-mappings,
use the better suited memcpy_to_page() helper.

Suggested-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Link: https://lore.kernel.org/r/20230103182556.29080-1-fmdefrancesco@gmail.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Fabio M. De Francesco 2023-01-03 19:25:56 +01:00 committed by Martin K. Petersen
parent 7edd053b33
commit a3e2e248fd
1 changed files with 2 additions and 7 deletions
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9
drivers/scsi/ipr.c
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@ -3912,7 +3912,6 @@ static int ipr_copy_ucode_buffer(struct ipr_sglist *sglist,
{
int bsize_elem, i, result = 0;
struct scatterlist *sg;
void *kaddr;
/* Determine the actual number of bytes per element */
bsize_elem = PAGE_SIZE * (1 << sglist->order);
@ -3923,9 +3922,7 @@ static int ipr_copy_ucode_buffer(struct ipr_sglist *sglist,
buffer += bsize_elem) {
struct page *page = sg_page(sg);
kaddr = kmap(page);
memcpy(kaddr, buffer, bsize_elem);
kunmap(page);
memcpy_to_page(page, 0, buffer, bsize_elem);
sg->length = bsize_elem;
@ -3938,9 +3935,7 @@ static int ipr_copy_ucode_buffer(struct ipr_sglist *sglist,
if (len % bsize_elem) {
struct page *page = sg_page(sg);
kaddr = kmap(page);
memcpy(kaddr, buffer, len % bsize_elem);
kunmap(page);
memcpy_to_page(page, 0, buffer, len % bsize_elem);
sg->length = len % bsize_elem;
}