svn commit: r307253 - in stable/10/sys: cam/ata sys

[Sepherosa Ziehau]

Author: sephe
Date: Fri Oct 14 03:11:31 2016
New Revision: 307253
URL: https://svnweb.freebsd.org/changeset/base/307253

Log:
  MFC 306396
  
      cam/ata: Allow drivers to veto ATA disk attachment.
  
      This eventhandler is mainly used by VMs, e.g. Hyper-V, whose disk
      controllers share the disks with the simulated ATA controllers.
  
      Submitted by:   Hongjiang Zhang <honzhan microsoft com>
      Discussed with: mav
      Sponsored by:   Microsoft
      Differential Revision:  https://reviews.freebsd.org/D7693

Modified:
  stable/10/sys/cam/ata/ata_xpt.c
  stable/10/sys/sys/eventhandler.h
Directory Properties:
  stable/10/   (props changed)

Modified: stable/10/sys/cam/ata/ata_xpt.c
==============================================================================
--- stable/10/sys/cam/ata/ata_xpt.c	Fri Oct 14 03:00:53 2016	(r307252)
+++ stable/10/sys/cam/ata/ata_xpt.c	Fri Oct 14 03:11:31 2016	(r307253)
@@ -40,6 +40,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/interrupt.h>
 #include <sys/sbuf.h>
 
+#include <sys/eventhandler.h>
 #include <sys/lock.h>
 #include <sys/mutex.h>
 #include <sys/sysctl.h>
@@ -827,12 +828,24 @@ noerror:
 	{
 		struct ccb_pathinq cpi;
 		int16_t *ptr;
+		int veto = 0;
 
 		ident_buf = &softc->ident_data;
 		for (ptr = (int16_t *)ident_buf;
 		     ptr < (int16_t *)ident_buf + sizeof(struct ata_params)/2; ptr++) {
 			*ptr = le16toh(*ptr);
 		}
+
+		/*
+		 * Allow others to veto this ATA disk attachment.  This
+		 * is mainly used by VMs, whose disk controllers may
+		 * share the disks with the simulated ATA controllers.
+		 */
+		EVENTHANDLER_INVOKE(ada_probe_veto, path, ident_buf, &veto);
+		if (veto) {
+			goto device_fail;
+		}
+
 		if (strncmp(ident_buf->model, "FX", 2) &&
 		    strncmp(ident_buf->model, "NEC", 3) &&
 		    strncmp(ident_buf->model, "Pioneer", 7) &&

Modified: stable/10/sys/sys/eventhandler.h
==============================================================================
--- stable/10/sys/sys/eventhandler.h	Fri Oct 14 03:00:53 2016	(r307252)
+++ stable/10/sys/sys/eventhandler.h	Fri Oct 14 03:11:31 2016	(r307253)
@@ -283,4 +283,11 @@ typedef void (*unregister_framebuffer_fn
 EVENTHANDLER_DECLARE(register_framebuffer, register_framebuffer_fn);
 EVENTHANDLER_DECLARE(unregister_framebuffer, unregister_framebuffer_fn);
 
+/* Veto ada attachment */
+struct cam_path;
+struct ata_params;
+typedef void (*ada_probe_veto_fn)(void *, struct cam_path *,
+    struct ata_params *, int *);
+EVENTHANDLER_DECLARE(ada_probe_veto, ada_probe_veto_fn);
+
 #endif /* SYS_EVENTHANDLER_H */