From 7390619ab9ea9fd0ba9f4c3e4749ee20262cba7d Mon Sep 17 00:00:00 2001 From: Xiaochen Shen Date: Wed, 17 Apr 2019 19:08:48 +0800 Subject: x86/resctrl: Move per RDT domain initialization to a separate function Carve out per rdt_domain initialization code from rdtgroup_init_alloc() into a separate function. No functional change, make the code more readable and save us at least two indentation levels. Signed-off-by: Xiaochen Shen Signed-off-by: Borislav Petkov Cc: Fenghua Yu Cc: "H. Peter Anvin" Cc: Ingo Molnar Cc: pei.p.jia@intel.com Cc: Reinette Chatre Cc: Thomas Gleixner Cc: Tony Luck Cc: x86-ml Link: https://lkml.kernel.org/r/1555499329-1170-2-git-send-email-xiaochen.shen@intel.com --- arch/x86/kernel/cpu/resctrl/rdtgroup.c | 131 ++++++++++++++++++--------------- 1 file changed, 72 insertions(+), 59 deletions(-) (limited to 'arch/x86/kernel/cpu/resctrl/rdtgroup.c') diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c index 85212a32b54d..36ace51ee705 100644 --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c @@ -2516,28 +2516,86 @@ static void cbm_ensure_valid(u32 *_val, struct rdt_resource *r) bitmap_clear(val, zero_bit, cbm_len - zero_bit); } +/* + * Initialize cache resources per RDT domain + * + * Set the RDT domain up to start off with all usable allocations. That is, + * all shareable and unused bits. All-zero CBM is invalid. + */ +static int __init_one_rdt_domain(struct rdt_domain *d, struct rdt_resource *r, + u32 closid) +{ + struct rdt_resource *r_cdp = NULL; + struct rdt_domain *d_cdp = NULL; + u32 used_b = 0, unused_b = 0; + unsigned long tmp_cbm; + enum rdtgrp_mode mode; + u32 peer_ctl, *ctrl; + int i; + + rdt_cdp_peer_get(r, d, &r_cdp, &d_cdp); + d->have_new_ctrl = false; + d->new_ctrl = r->cache.shareable_bits; + used_b = r->cache.shareable_bits; + ctrl = d->ctrl_val; + for (i = 0; i < closids_supported(); i++, ctrl++) { + if (closid_allocated(i) && i != closid) { + mode = rdtgroup_mode_by_closid(i); + if (mode == RDT_MODE_PSEUDO_LOCKSETUP) + break; + /* + * If CDP is active include peer domain's + * usage to ensure there is no overlap + * with an exclusive group. + */ + if (d_cdp) + peer_ctl = d_cdp->ctrl_val[i]; + else + peer_ctl = 0; + used_b |= *ctrl | peer_ctl; + if (mode == RDT_MODE_SHAREABLE) + d->new_ctrl |= *ctrl | peer_ctl; + } + } + if (d->plr && d->plr->cbm > 0) + used_b |= d->plr->cbm; + unused_b = used_b ^ (BIT_MASK(r->cache.cbm_len) - 1); + unused_b &= BIT_MASK(r->cache.cbm_len) - 1; + d->new_ctrl |= unused_b; + /* + * Force the initial CBM to be valid, user can + * modify the CBM based on system availability. + */ + cbm_ensure_valid(&d->new_ctrl, r); + /* + * Assign the u32 CBM to an unsigned long to ensure that + * bitmap_weight() does not access out-of-bound memory. + */ + tmp_cbm = d->new_ctrl; + if (bitmap_weight(&tmp_cbm, r->cache.cbm_len) < r->cache.min_cbm_bits) { + rdt_last_cmd_printf("No space on %s:%d\n", r->name, d->id); + return -ENOSPC; + } + d->have_new_ctrl = true; + + return 0; +} + /** * rdtgroup_init_alloc - Initialize the new RDT group's allocations * * A new RDT group is being created on an allocation capable (CAT) * supporting system. Set this group up to start off with all usable - * allocations. That is, all shareable and unused bits. + * allocations. * - * All-zero CBM is invalid. If there are no more shareable bits available - * on any domain then the entire allocation will fail. + * If there are no more shareable bits available on any domain then + * the entire allocation will fail. */ static int rdtgroup_init_alloc(struct rdtgroup *rdtgrp) { - struct rdt_resource *r_cdp = NULL; - struct rdt_domain *d_cdp = NULL; - u32 used_b = 0, unused_b = 0; - u32 closid = rdtgrp->closid; struct rdt_resource *r; - unsigned long tmp_cbm; - enum rdtgrp_mode mode; struct rdt_domain *d; - u32 peer_ctl, *ctrl; - int i, ret; + int ret; for_each_alloc_enabled_rdt_resource(r) { /* @@ -2547,54 +2605,9 @@ static int rdtgroup_init_alloc(struct rdtgroup *rdtgrp) if (r->rid == RDT_RESOURCE_MBA) continue; list_for_each_entry(d, &r->domains, list) { - rdt_cdp_peer_get(r, d, &r_cdp, &d_cdp); - d->have_new_ctrl = false; - d->new_ctrl = r->cache.shareable_bits; - used_b = r->cache.shareable_bits; - ctrl = d->ctrl_val; - for (i = 0; i < closids_supported(); i++, ctrl++) { - if (closid_allocated(i) && i != closid) { - mode = rdtgroup_mode_by_closid(i); - if (mode == RDT_MODE_PSEUDO_LOCKSETUP) - break; - /* - * If CDP is active include peer - * domain's usage to ensure there - * is no overlap with an exclusive - * group. - */ - if (d_cdp) - peer_ctl = d_cdp->ctrl_val[i]; - else - peer_ctl = 0; - used_b |= *ctrl | peer_ctl; - if (mode == RDT_MODE_SHAREABLE) - d->new_ctrl |= *ctrl | peer_ctl; - } - } - if (d->plr && d->plr->cbm > 0) - used_b |= d->plr->cbm; - unused_b = used_b ^ (BIT_MASK(r->cache.cbm_len) - 1); - unused_b &= BIT_MASK(r->cache.cbm_len) - 1; - d->new_ctrl |= unused_b; - /* - * Force the initial CBM to be valid, user can - * modify the CBM based on system availability. - */ - cbm_ensure_valid(&d->new_ctrl, r); - /* - * Assign the u32 CBM to an unsigned long to ensure - * that bitmap_weight() does not access out-of-bound - * memory. - */ - tmp_cbm = d->new_ctrl; - if (bitmap_weight(&tmp_cbm, r->cache.cbm_len) < - r->cache.min_cbm_bits) { - rdt_last_cmd_printf("No space on %s:%d\n", - r->name, d->id); - return -ENOSPC; - } - d->have_new_ctrl = true; + ret = __init_one_rdt_domain(d, r, rdtgrp->closid); + if (ret < 0) + return ret; } } -- cgit v1.2.3-59-g8ed1b