platforms/pseries/vas.c

54 				     u8 wintype, u16 credits)
61 				  credits, domain[0], domain[1], domain[2],
79 	pr_err("H_ALLOCATE_VAS_WINDOW error: %ld, wintype: %u, credits: %u\n",
80 		rc, wintype, credits);
312 	 * A VAS window can have many credits which means that many
315 	 * The hypervisor introduces 2 different types of credits:
317 	 *	A limited number of credits are assigned to partitions
318 	 *	based on processor entitlement. But these credits may be
327 	 *	QoS credits for each LPAR so that this partition is
328 	 *	guaranteed access to NX resources. These credits are
332 	 * Allocate window with QoS credits if user requested. Otherwise
333 	 * default credits are used.
424 	 * closed windows (means with lost credits), do not give new
426 	 * after the existing windows are reopened when credits are
478 	 * credits have to be returned. In the case of fault
624  * VAS windows can be closed due to lost credits when the core is
625  * removed. So reopen them if credits are available due to DLPAR
647 	 * For the core removal, the hypervisor reduces the credits
649 	 * in the hypervisor depends on reduced credits. The kernel
651 	 * first) and expects to open in the same order when credits
655 	 * credits. It means the kernel can reopen 20 windows. So move
733  * The hypervisor reduces the available credits if the LPAR lost core. It
778 		 * Number of available credits are reduced, So select
828  * changes. Reconfig window configurations based on the credits
852 	 * The total number of available credits may be decreased or
859 		 * If the existing target credits is less than the new
868 		 * credits. So close the excessive windows.
908  * Total number of default credits available (target_credits)
924 	 * For shared CPU partition, the hypervisor assigns total credits
991 				pr_err("Target credits mismatch with the hypervisor\n");