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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.
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=368134
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@ -783,7 +783,6 @@ cam_periph_mapmem(union ccb *ccb, struct cam_periph_map_info *mapinfo,
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u_int8_t **data_ptrs[CAM_PERIPH_MAXMAPS];
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u_int32_t lengths[CAM_PERIPH_MAXMAPS];
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u_int32_t dirs[CAM_PERIPH_MAXMAPS];
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bool misaligned[CAM_PERIPH_MAXMAPS];
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bzero(mapinfo, sizeof(*mapinfo));
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if (maxmap == 0)
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@ -901,17 +900,6 @@ cam_periph_mapmem(union ccb *ccb, struct cam_periph_map_info *mapinfo,
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(long)(lengths[i]), (u_long)maxmap);
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return (E2BIG);
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}
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/*
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* The userland data pointer passed in may not be page
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* aligned. vmapbuf() truncates the address to a page
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* boundary, so if the address isn't page aligned, we'll
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* need enough space for the given transfer length, plus
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* whatever extra space is necessary to make it to the page
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* boundary.
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*/
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misaligned[i] = (lengths[i] +
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(((vm_offset_t)(*data_ptrs[i])) & PAGE_MASK) > maxphys);
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}
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/*
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@ -934,7 +922,7 @@ cam_periph_mapmem(union ccb *ccb, struct cam_periph_map_info *mapinfo,
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* small allocations malloc is backed by UMA, and so much
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* cheaper on SMP systems.
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*/
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if ((lengths[i] <= periph_mapmem_thresh || misaligned[i]) &&
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if (lengths[i] <= periph_mapmem_thresh &&
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ccb->ccb_h.func_code != XPT_MMC_IO) {
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*data_ptrs[i] = malloc(lengths[i], M_CAMPERIPH,
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M_WAITOK);
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