Commit 23a50861 authored by Damien Le Moal's avatar Damien Le Moal Committed by Jens Axboe

scsi: sd_zbc: Cleanup sd_zbc_alloc_report_buffer()

There is no need to arbitrarily limit the size of a report zone to the
number of zones defined by SD_ZBC_REPORT_MAX_ZONES. Rather, simply
calculate the report buffer size needed for the requested number of
zones without exceeding the device total number of zones. This buffer
size limitation to the hardware maximum transfer size and page mapping
capabilities is kept unchanged. Starting with this initial buffer size,
the allocation is optimized by iterating over decreasing buffer size
until the allocation succeeds (each iteration is allowed to fail fast
using the __GFP_NORETRY flag). This ensures forward progress for zone
reports and avoids failures of zones revalidation under memory pressure.

While at it, also replace the hard coded 512 B sector size with the
SECTOR_SIZE macro.
Reviewed-by: default avatarHannes Reinecke <hare@suse.de>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Acked-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: default avatarDamien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 6d09c408
......@@ -104,11 +104,6 @@ static int sd_zbc_do_report_zones(struct scsi_disk *sdkp, unsigned char *buf,
return 0;
}
/*
* Maximum number of zones to get with one report zones command.
*/
#define SD_ZBC_REPORT_MAX_ZONES 8192U
/**
* Allocate a buffer for report zones reply.
* @sdkp: The target disk
......@@ -138,17 +133,24 @@ static void *sd_zbc_alloc_report_buffer(struct scsi_disk *sdkp,
* sure that the allocated buffer can always be mapped by limiting the
* number of pages allocated to the HBA max segments limit.
*/
nr_zones = min(nr_zones, SD_ZBC_REPORT_MAX_ZONES);
bufsize = roundup((nr_zones + 1) * 64, 512);
nr_zones = min(nr_zones, sdkp->nr_zones);
bufsize = roundup((nr_zones + 1) * 64, SECTOR_SIZE);
bufsize = min_t(size_t, bufsize,
queue_max_hw_sectors(q) << SECTOR_SHIFT);
bufsize = min_t(size_t, bufsize, queue_max_segments(q) << PAGE_SHIFT);
buf = vzalloc(bufsize);
if (buf)
while (bufsize >= SECTOR_SIZE) {
buf = __vmalloc(bufsize,
GFP_KERNEL | __GFP_ZERO | __GFP_NORETRY,
PAGE_KERNEL);
if (buf) {
*buflen = bufsize;
return buf;
}
bufsize >>= 1;
}
return NULL;
}
/**
......
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