Author: mav
Date: Sun Nov 29 00:49:14 2020
New Revision: 368134
URL: https://svnweb.freebsd.org/changeset/base/368134
Log:
Remove alignment requirements for KVA buffer mapping.
After r368124 vmapbuf() should happily map misaligned maxphys-sized buffers
thanks to extra page added to pbuf_zone.
Modified:
head/sys/cam/cam_periph.c
Modified: head/sys/cam/cam_periph.c
==============================================================================
--- head/sys/cam/cam_periph.c Sun Nov 29 00:35:13 2020 (r368133)
+++ head/sys/cam/cam_periph.c Sun Nov 29 00:49:14 2020 (r368134)
@@ -783,7 +783,6 @@ cam_periph_mapmem(union ccb *ccb, struct cam_periph_ma
u_int8_t **data_ptrs[CAM_PERIPH_MAXMAPS];
u_int32_t lengths[CAM_PERIPH_MAXMAPS];
u_int32_t dirs[CAM_PERIPH_MAXMAPS];
- bool misaligned[CAM_PERIPH_MAXMAPS];
bzero(mapinfo, sizeof(*mapinfo));
if (maxmap == 0)
@@ -901,17 +900,6 @@ cam_periph_mapmem(union ccb *ccb, struct cam_periph_ma
(long)(lengths[i]), (u_long)maxmap);
return (E2BIG);
}
-
- /*
- * The userland data pointer passed in may not be page
- * aligned. vmapbuf() truncates the address to a page
- * boundary, so if the address isn't page aligned, we'll
- * need enough space for the given transfer length, plus
- * whatever extra space is necessary to make it to the page
- * boundary.
- */
- misaligned[i] = (lengths[i] +
- (((vm_offset_t)(*data_ptrs[i])) & PAGE_MASK) > maxphys);
}
/*
@@ -934,7 +922,7 @@ cam_periph_mapmem(union ccb *ccb, struct cam_periph_ma
* small allocations malloc is backed by UMA, and so much
* cheaper on SMP systems.
*/
- if ((lengths[i] <= periph_mapmem_thresh || misaligned[i]) &&
+ if (lengths[i] <= periph_mapmem_thresh &&
ccb->ccb_h.func_code != XPT_MMC_IO) {
*data_ptrs[i] = malloc(lengths[i], M_CAMPERIPH,
M_WAITOK);
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