Lines Matching +full:boost +full:- +full:bypass

1 // SPDX-License-Identifier: GPL-2.0-only
3  * Broadcom Brahma-B15 CPU read-ahead cache management functions
5  * Copyright (C) 2015-2016 Broadcom
20 #include <asm/hardware/cache-b15-rac.h>
34 /* Brahma-B15 is a quad-core only design */
36 /* Brahma-B53 is an octo-core design */
40 /* Bitmask to enable instruction and data prefetching with a 256-bytes stride */
47 /* Special state where we want to bypass the spinlock and call directly
59  * multi-platform kernels from crashing here as well.
128 /* The readahead cache present in the Brahma-B15 CPU is a special piece of
131  * or 256 bytes. The rationale is that the data-bus of the CPU interface is
132  * optimized for 256-bytes transactions, and enabling the readahead cache
133  * provides a significant performance boost we want it enabled (typically
186  * Once this CPU is marked dead, we can safely re-enable the RAC for the
190  * issue since the CPU and its cache-level hierarchy will start filling with
212  * We are choosing not do disable the RAC on a per-CPU basis, here, if we did
239 /* Running on a non-dying CPU */
261 	/* Suspend the read-ahead cache oeprations, forcing our cache  in b15_rac_suspend()
276 	/* Coming out of a S3 suspend/resume cycle, the read-ahead cache  in b15_rac_resume()
278 	 * sure we re-enable it and set the enable flag, we are also guaranteed  in b15_rac_resume()
296 	dn = of_find_compatible_node(NULL, NULL, "brcm,brcmstb-cpu-biu-ctrl");  in b15_rac_init()
298 		return -ENODEV;  in b15_rac_init()
306 		ret = -ENOMEM;  in b15_rac_init()
312 		ret = -ENODEV;  in b15_rac_init()
316 	if (of_device_is_compatible(cpu_dn, "brcm,brahma-b15"))  in b15_rac_init()
318 	else if (of_device_is_compatible(cpu_dn, "brcm,brahma-b53"))  in b15_rac_init()
323 		ret = -EINVAL;  in b15_rac_init()
337 					"arm/cache-b15-rac:dead",  in b15_rac_init()
343 					"arm/cache-b15-rac:dying",  in b15_rac_init()
356 	WARN(reg & en_mask, "Read-ahead cache not previously disabled\n");  in b15_rac_init()
362 	pr_info("%pOF: Broadcom Brahma-B15 readahead cache\n", dn);  in b15_rac_init()