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Carlo Nonato
44dd6d4a12
Last Level Cache (LLC) coloring allows to partition the cache in smaller chunks called cache colors. Since not all architectures can actually implement it, add a HAS_LLC_COLORING Kconfig option. LLC_COLORS_ORDER Kconfig option has a range maximum of 10 (2^10 = 1024) because that's the number of colors that fit in a 4 KiB page when integers are 4 bytes long. LLC colors are a property of the domain, so struct domain has to be extended. Based on original work from: Luca Miccio <lucmiccio@gmail.com> Signed-off-by: Carlo Nonato <carlo.nonato@minervasys.tech> Signed-off-by: Marco Solieri <marco.solieri@minervasys.tech> Acked-by: Michal Orzel <michal.orzel@amd.com>
125 lines
3.1 KiB
C
125 lines
3.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Last Level Cache (LLC) coloring common code
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*
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* Copyright (C) 2024, Advanced Micro Devices, Inc.
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* Copyright (C) 2024, Minerva Systems SRL
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*/
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#include <xen/keyhandler.h>
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#include <xen/llc-coloring.h>
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#include <xen/param.h>
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#define NR_LLC_COLORS (1U << CONFIG_LLC_COLORS_ORDER)
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/*
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* -1: not specified (disabled unless llc-size and llc-nr-ways present)
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* 0: explicitly disabled through cmdline
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* 1: explicitly enabled through cmdline
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*/
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static int8_t __initdata opt_llc_coloring = -1;
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boolean_param("llc-coloring", opt_llc_coloring);
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static bool __ro_after_init llc_coloring_enabled;
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static unsigned int __initdata llc_size;
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size_param("llc-size", llc_size);
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static unsigned int __initdata llc_nr_ways;
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integer_param("llc-nr-ways", llc_nr_ways);
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/* Number of colors available in the LLC */
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static unsigned int __ro_after_init max_nr_colors;
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static void print_colors(const unsigned int colors[], unsigned int num_colors)
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{
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unsigned int i;
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printk("{ ");
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for ( i = 0; i < num_colors; i++ )
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{
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unsigned int start = colors[i], end = start;
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printk("%u", start);
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for ( ; i < num_colors - 1 && end + 1 == colors[i + 1]; i++, end++ )
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;
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if ( start != end )
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printk("-%u", end);
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if ( i < num_colors - 1 )
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printk(", ");
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}
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printk(" }\n");
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}
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void __init llc_coloring_init(void)
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{
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unsigned int way_size;
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llc_coloring_enabled = (opt_llc_coloring >= 1);
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if ( (opt_llc_coloring != 0) && llc_size && llc_nr_ways )
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{
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llc_coloring_enabled = true;
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way_size = llc_size / llc_nr_ways;
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}
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else if ( !llc_coloring_enabled )
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return;
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else
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{
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way_size = get_llc_way_size();
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if ( !way_size )
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panic("LLC probing failed and 'llc-size' or 'llc-nr-ways' missing\n");
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}
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if ( way_size & ~PAGE_MASK )
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panic("LLC way size must be a multiple of PAGE_SIZE\n");
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/*
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* The maximum number of colors must be a power of 2 in order to correctly
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* map them to bits of an address.
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*/
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max_nr_colors = way_size >> PAGE_SHIFT;
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if ( max_nr_colors & (max_nr_colors - 1) )
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panic("Number of LLC colors (%u) isn't a power of 2\n", max_nr_colors);
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if ( max_nr_colors > NR_LLC_COLORS )
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{
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printk(XENLOG_WARNING
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"Number of LLC colors (%u) too big. Using configured max %u\n",
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max_nr_colors, NR_LLC_COLORS);
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max_nr_colors = NR_LLC_COLORS;
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}
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else if ( max_nr_colors < 2 )
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panic("Number of LLC colors %u < 2\n", max_nr_colors);
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arch_llc_coloring_init();
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}
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void dump_llc_coloring_info(void)
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{
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if ( !llc_coloring_enabled )
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return;
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printk("LLC coloring info:\n");
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printk(" Number of LLC colors supported: %u\n", max_nr_colors);
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}
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void domain_dump_llc_colors(const struct domain *d)
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{
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if ( !llc_coloring_enabled )
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return;
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printk("%u LLC colors: ", d->num_llc_colors);
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print_colors(d->llc_colors, d->num_llc_colors);
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}
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/*
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* Local variables:
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* mode: C
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* c-file-style: "BSD"
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* c-basic-offset: 4
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* tab-width: 4
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* indent-tabs-mode: nil
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* End:
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*/
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