mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-24 09:50:04 +00:00
![Kees Cook](/assets/img/avatar_default.png)
The kzalloc() function has a 2-factor argument form, kcalloc(). This patch replaces cases of: kzalloc(a * b, gfp) with: kcalloc(a * b, gfp) as well as handling cases of: kzalloc(a * b * c, gfp) with: kzalloc(array3_size(a, b, c), gfp) as it's slightly less ugly than: kzalloc_array(array_size(a, b), c, gfp) This does, however, attempt to ignore constant size factors like: kzalloc(4 * 1024, gfp) though any constants defined via macros get caught up in the conversion. Any factors with a sizeof() of "unsigned char", "char", and "u8" were dropped, since they're redundant. The Coccinelle script used for this was: // Fix redundant parens around sizeof(). @@ type TYPE; expression THING, E; @@ ( kzalloc( - (sizeof(TYPE)) * E + sizeof(TYPE) * E , ...) | kzalloc( - (sizeof(THING)) * E + sizeof(THING) * E , ...) ) // Drop single-byte sizes and redundant parens. @@ expression COUNT; typedef u8; typedef __u8; @@ ( kzalloc( - sizeof(u8) * (COUNT) + COUNT , ...) | kzalloc( - sizeof(__u8) * (COUNT) + COUNT , ...) | kzalloc( - sizeof(char) * (COUNT) + COUNT , ...) | kzalloc( - sizeof(unsigned char) * (COUNT) + COUNT , ...) | kzalloc( - sizeof(u8) * COUNT + COUNT , ...) | kzalloc( - sizeof(__u8) * COUNT + COUNT , ...) | kzalloc( - sizeof(char) * COUNT + COUNT , ...) | kzalloc( - sizeof(unsigned char) * COUNT + COUNT , ...) ) // 2-factor product with sizeof(type/expression) and identifier or constant. @@ type TYPE; expression THING; identifier COUNT_ID; constant COUNT_CONST; @@ ( - kzalloc + kcalloc ( - sizeof(TYPE) * (COUNT_ID) + COUNT_ID, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * COUNT_ID + COUNT_ID, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * (COUNT_CONST) + COUNT_CONST, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * COUNT_CONST + COUNT_CONST, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * (COUNT_ID) + COUNT_ID, sizeof(THING) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * COUNT_ID + COUNT_ID, sizeof(THING) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * (COUNT_CONST) + COUNT_CONST, sizeof(THING) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * COUNT_CONST + COUNT_CONST, sizeof(THING) , ...) ) // 2-factor product, only identifiers. @@ identifier SIZE, COUNT; @@ - kzalloc + kcalloc ( - SIZE * COUNT + COUNT, SIZE , ...) // 3-factor product with 1 sizeof(type) or sizeof(expression), with // redundant parens removed. @@ expression THING; identifier STRIDE, COUNT; type TYPE; @@ ( kzalloc( - sizeof(TYPE) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kzalloc( - sizeof(TYPE) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kzalloc( - sizeof(TYPE) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kzalloc( - sizeof(TYPE) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kzalloc( - sizeof(THING) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kzalloc( - sizeof(THING) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kzalloc( - sizeof(THING) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kzalloc( - sizeof(THING) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) ) // 3-factor product with 2 sizeof(variable), with redundant parens removed. @@ expression THING1, THING2; identifier COUNT; type TYPE1, TYPE2; @@ ( kzalloc( - sizeof(TYPE1) * sizeof(TYPE2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | kzalloc( - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | kzalloc( - sizeof(THING1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | kzalloc( - sizeof(THING1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | kzalloc( - sizeof(TYPE1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) | kzalloc( - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) ) // 3-factor product, only identifiers, with redundant parens removed. @@ identifier STRIDE, SIZE, COUNT; @@ ( kzalloc( - (COUNT) * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - COUNT * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - COUNT * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - (COUNT) * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - COUNT * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - (COUNT) * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - (COUNT) * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - COUNT * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) ) // Any remaining multi-factor products, first at least 3-factor products, // when they're not all constants... @@ expression E1, E2, E3; constant C1, C2, C3; @@ ( kzalloc(C1 * C2 * C3, ...) | kzalloc( - (E1) * E2 * E3 + array3_size(E1, E2, E3) , ...) | kzalloc( - (E1) * (E2) * E3 + array3_size(E1, E2, E3) , ...) | kzalloc( - (E1) * (E2) * (E3) + array3_size(E1, E2, E3) , ...) | kzalloc( - E1 * E2 * E3 + array3_size(E1, E2, E3) , ...) ) // And then all remaining 2 factors products when they're not all constants, // keeping sizeof() as the second factor argument. @@ expression THING, E1, E2; type TYPE; constant C1, C2, C3; @@ ( kzalloc(sizeof(THING) * C2, ...) | kzalloc(sizeof(TYPE) * C2, ...) | kzalloc(C1 * C2 * C3, ...) | kzalloc(C1 * C2, ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * (E2) + E2, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * E2 + E2, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * (E2) + E2, sizeof(THING) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * E2 + E2, sizeof(THING) , ...) | - kzalloc + kcalloc ( - (E1) * E2 + E1, E2 , ...) | - kzalloc + kcalloc ( - (E1) * (E2) + E1, E2 , ...) | - kzalloc + kcalloc ( - E1 * E2 + E1, E2 , ...) ) Signed-off-by: Kees Cook <keescook@chromium.org>
436 lines
11 KiB
C
436 lines
11 KiB
C
/*
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* Copyright (c) 2009, Microsoft Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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*
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* Authors:
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* Haiyang Zhang <haiyangz@microsoft.com>
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* Hank Janssen <hjanssen@microsoft.com>
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/hyperv.h>
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#include <linux/version.h>
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#include <linux/random.h>
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#include <linux/clockchips.h>
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#include <asm/mshyperv.h>
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#include "hyperv_vmbus.h"
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/* The one and only */
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struct hv_context hv_context = {
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.synic_initialized = false,
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};
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/*
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* If false, we're using the old mechanism for stimer0 interrupts
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* where it sends a VMbus message when it expires. The old
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* mechanism is used when running on older versions of Hyper-V
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* that don't support Direct Mode. While Hyper-V provides
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* four stimer's per CPU, Linux uses only stimer0.
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*/
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static bool direct_mode_enabled;
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static int stimer0_irq;
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static int stimer0_vector;
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#define HV_TIMER_FREQUENCY (10 * 1000 * 1000) /* 100ns period */
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#define HV_MAX_MAX_DELTA_TICKS 0xffffffff
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#define HV_MIN_DELTA_TICKS 1
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/*
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* hv_init - Main initialization routine.
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*
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* This routine must be called before any other routines in here are called
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*/
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int hv_init(void)
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{
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hv_context.cpu_context = alloc_percpu(struct hv_per_cpu_context);
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if (!hv_context.cpu_context)
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return -ENOMEM;
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direct_mode_enabled = ms_hyperv.misc_features &
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HV_X64_STIMER_DIRECT_MODE_AVAILABLE;
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return 0;
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}
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/*
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* hv_post_message - Post a message using the hypervisor message IPC.
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*
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* This involves a hypercall.
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*/
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int hv_post_message(union hv_connection_id connection_id,
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enum hv_message_type message_type,
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void *payload, size_t payload_size)
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{
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struct hv_input_post_message *aligned_msg;
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struct hv_per_cpu_context *hv_cpu;
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u64 status;
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if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT)
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return -EMSGSIZE;
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hv_cpu = get_cpu_ptr(hv_context.cpu_context);
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aligned_msg = hv_cpu->post_msg_page;
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aligned_msg->connectionid = connection_id;
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aligned_msg->reserved = 0;
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aligned_msg->message_type = message_type;
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aligned_msg->payload_size = payload_size;
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memcpy((void *)aligned_msg->payload, payload, payload_size);
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status = hv_do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL);
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/* Preemption must remain disabled until after the hypercall
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* so some other thread can't get scheduled onto this cpu and
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* corrupt the per-cpu post_msg_page
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*/
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put_cpu_ptr(hv_cpu);
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return status & 0xFFFF;
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}
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/*
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* ISR for when stimer0 is operating in Direct Mode. Direct Mode
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* does not use VMbus or any VMbus messages, so process here and not
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* in the VMbus driver code.
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*/
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static void hv_stimer0_isr(void)
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{
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struct hv_per_cpu_context *hv_cpu;
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hv_cpu = this_cpu_ptr(hv_context.cpu_context);
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hv_cpu->clk_evt->event_handler(hv_cpu->clk_evt);
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add_interrupt_randomness(stimer0_vector, 0);
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}
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static int hv_ce_set_next_event(unsigned long delta,
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struct clock_event_device *evt)
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{
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u64 current_tick;
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WARN_ON(!clockevent_state_oneshot(evt));
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current_tick = hyperv_cs->read(NULL);
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current_tick += delta;
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hv_init_timer(HV_X64_MSR_STIMER0_COUNT, current_tick);
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return 0;
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}
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static int hv_ce_shutdown(struct clock_event_device *evt)
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{
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hv_init_timer(HV_X64_MSR_STIMER0_COUNT, 0);
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hv_init_timer_config(HV_X64_MSR_STIMER0_CONFIG, 0);
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if (direct_mode_enabled)
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hv_disable_stimer0_percpu_irq(stimer0_irq);
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return 0;
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}
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static int hv_ce_set_oneshot(struct clock_event_device *evt)
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{
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union hv_timer_config timer_cfg;
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timer_cfg.as_uint64 = 0;
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timer_cfg.enable = 1;
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timer_cfg.auto_enable = 1;
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if (direct_mode_enabled) {
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/*
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* When it expires, the timer will directly interrupt
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* on the specified hardware vector/IRQ.
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*/
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timer_cfg.direct_mode = 1;
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timer_cfg.apic_vector = stimer0_vector;
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hv_enable_stimer0_percpu_irq(stimer0_irq);
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} else {
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/*
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* When it expires, the timer will generate a VMbus message,
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* to be handled by the normal VMbus interrupt handler.
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*/
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timer_cfg.direct_mode = 0;
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timer_cfg.sintx = VMBUS_MESSAGE_SINT;
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}
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hv_init_timer_config(HV_X64_MSR_STIMER0_CONFIG, timer_cfg.as_uint64);
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return 0;
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}
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static void hv_init_clockevent_device(struct clock_event_device *dev, int cpu)
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{
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dev->name = "Hyper-V clockevent";
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dev->features = CLOCK_EVT_FEAT_ONESHOT;
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dev->cpumask = cpumask_of(cpu);
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dev->rating = 1000;
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/*
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* Avoid settint dev->owner = THIS_MODULE deliberately as doing so will
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* result in clockevents_config_and_register() taking additional
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* references to the hv_vmbus module making it impossible to unload.
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*/
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dev->set_state_shutdown = hv_ce_shutdown;
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dev->set_state_oneshot = hv_ce_set_oneshot;
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dev->set_next_event = hv_ce_set_next_event;
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}
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int hv_synic_alloc(void)
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{
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int cpu;
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hv_context.hv_numa_map = kcalloc(nr_node_ids, sizeof(struct cpumask),
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GFP_KERNEL);
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if (hv_context.hv_numa_map == NULL) {
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pr_err("Unable to allocate NUMA map\n");
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goto err;
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}
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for_each_present_cpu(cpu) {
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struct hv_per_cpu_context *hv_cpu
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= per_cpu_ptr(hv_context.cpu_context, cpu);
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memset(hv_cpu, 0, sizeof(*hv_cpu));
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tasklet_init(&hv_cpu->msg_dpc,
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vmbus_on_msg_dpc, (unsigned long) hv_cpu);
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hv_cpu->clk_evt = kzalloc(sizeof(struct clock_event_device),
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GFP_KERNEL);
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if (hv_cpu->clk_evt == NULL) {
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pr_err("Unable to allocate clock event device\n");
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goto err;
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}
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hv_init_clockevent_device(hv_cpu->clk_evt, cpu);
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hv_cpu->synic_message_page =
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(void *)get_zeroed_page(GFP_ATOMIC);
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if (hv_cpu->synic_message_page == NULL) {
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pr_err("Unable to allocate SYNIC message page\n");
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goto err;
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}
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hv_cpu->synic_event_page = (void *)get_zeroed_page(GFP_ATOMIC);
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if (hv_cpu->synic_event_page == NULL) {
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pr_err("Unable to allocate SYNIC event page\n");
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goto err;
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}
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hv_cpu->post_msg_page = (void *)get_zeroed_page(GFP_ATOMIC);
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if (hv_cpu->post_msg_page == NULL) {
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pr_err("Unable to allocate post msg page\n");
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goto err;
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}
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INIT_LIST_HEAD(&hv_cpu->chan_list);
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}
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if (direct_mode_enabled &&
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hv_setup_stimer0_irq(&stimer0_irq, &stimer0_vector,
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hv_stimer0_isr))
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goto err;
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return 0;
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err:
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return -ENOMEM;
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}
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void hv_synic_free(void)
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{
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int cpu;
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for_each_present_cpu(cpu) {
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struct hv_per_cpu_context *hv_cpu
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= per_cpu_ptr(hv_context.cpu_context, cpu);
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if (hv_cpu->synic_event_page)
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free_page((unsigned long)hv_cpu->synic_event_page);
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if (hv_cpu->synic_message_page)
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free_page((unsigned long)hv_cpu->synic_message_page);
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if (hv_cpu->post_msg_page)
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free_page((unsigned long)hv_cpu->post_msg_page);
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}
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kfree(hv_context.hv_numa_map);
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}
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/*
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* hv_synic_init - Initialize the Synthetic Interrupt Controller.
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*
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* If it is already initialized by another entity (ie x2v shim), we need to
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* retrieve the initialized message and event pages. Otherwise, we create and
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* initialize the message and event pages.
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*/
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int hv_synic_init(unsigned int cpu)
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{
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struct hv_per_cpu_context *hv_cpu
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= per_cpu_ptr(hv_context.cpu_context, cpu);
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union hv_synic_simp simp;
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union hv_synic_siefp siefp;
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union hv_synic_sint shared_sint;
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union hv_synic_scontrol sctrl;
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/* Setup the Synic's message page */
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hv_get_simp(simp.as_uint64);
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simp.simp_enabled = 1;
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simp.base_simp_gpa = virt_to_phys(hv_cpu->synic_message_page)
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>> PAGE_SHIFT;
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hv_set_simp(simp.as_uint64);
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/* Setup the Synic's event page */
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hv_get_siefp(siefp.as_uint64);
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siefp.siefp_enabled = 1;
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siefp.base_siefp_gpa = virt_to_phys(hv_cpu->synic_event_page)
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>> PAGE_SHIFT;
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hv_set_siefp(siefp.as_uint64);
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/* Setup the shared SINT. */
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hv_get_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
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shared_sint.as_uint64);
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shared_sint.vector = HYPERVISOR_CALLBACK_VECTOR;
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shared_sint.masked = false;
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if (ms_hyperv.hints & HV_X64_DEPRECATING_AEOI_RECOMMENDED)
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shared_sint.auto_eoi = false;
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else
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shared_sint.auto_eoi = true;
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hv_set_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
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shared_sint.as_uint64);
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/* Enable the global synic bit */
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hv_get_synic_state(sctrl.as_uint64);
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sctrl.enable = 1;
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hv_set_synic_state(sctrl.as_uint64);
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hv_context.synic_initialized = true;
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/*
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* Register the per-cpu clockevent source.
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*/
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if (ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE)
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clockevents_config_and_register(hv_cpu->clk_evt,
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HV_TIMER_FREQUENCY,
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HV_MIN_DELTA_TICKS,
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HV_MAX_MAX_DELTA_TICKS);
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return 0;
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}
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/*
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* hv_synic_clockevents_cleanup - Cleanup clockevent devices
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*/
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void hv_synic_clockevents_cleanup(void)
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{
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int cpu;
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if (!(ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE))
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return;
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if (direct_mode_enabled)
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hv_remove_stimer0_irq(stimer0_irq);
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for_each_present_cpu(cpu) {
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struct hv_per_cpu_context *hv_cpu
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= per_cpu_ptr(hv_context.cpu_context, cpu);
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clockevents_unbind_device(hv_cpu->clk_evt, cpu);
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}
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}
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/*
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* hv_synic_cleanup - Cleanup routine for hv_synic_init().
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*/
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int hv_synic_cleanup(unsigned int cpu)
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{
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union hv_synic_sint shared_sint;
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union hv_synic_simp simp;
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union hv_synic_siefp siefp;
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union hv_synic_scontrol sctrl;
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struct vmbus_channel *channel, *sc;
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bool channel_found = false;
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unsigned long flags;
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if (!hv_context.synic_initialized)
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return -EFAULT;
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/*
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* Search for channels which are bound to the CPU we're about to
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* cleanup. In case we find one and vmbus is still connected we need to
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* fail, this will effectively prevent CPU offlining. There is no way
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* we can re-bind channels to different CPUs for now.
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*/
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mutex_lock(&vmbus_connection.channel_mutex);
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list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
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if (channel->target_cpu == cpu) {
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channel_found = true;
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break;
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}
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spin_lock_irqsave(&channel->lock, flags);
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list_for_each_entry(sc, &channel->sc_list, sc_list) {
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if (sc->target_cpu == cpu) {
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channel_found = true;
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break;
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}
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}
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spin_unlock_irqrestore(&channel->lock, flags);
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if (channel_found)
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break;
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}
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mutex_unlock(&vmbus_connection.channel_mutex);
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|
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if (channel_found && vmbus_connection.conn_state == CONNECTED)
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return -EBUSY;
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|
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/* Turn off clockevent device */
|
|
if (ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE) {
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struct hv_per_cpu_context *hv_cpu
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= this_cpu_ptr(hv_context.cpu_context);
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|
|
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clockevents_unbind_device(hv_cpu->clk_evt, cpu);
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hv_ce_shutdown(hv_cpu->clk_evt);
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put_cpu_ptr(hv_cpu);
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}
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|
|
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hv_get_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
|
|
shared_sint.as_uint64);
|
|
|
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shared_sint.masked = 1;
|
|
|
|
/* Need to correctly cleanup in the case of SMP!!! */
|
|
/* Disable the interrupt */
|
|
hv_set_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
|
|
shared_sint.as_uint64);
|
|
|
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hv_get_simp(simp.as_uint64);
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simp.simp_enabled = 0;
|
|
simp.base_simp_gpa = 0;
|
|
|
|
hv_set_simp(simp.as_uint64);
|
|
|
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hv_get_siefp(siefp.as_uint64);
|
|
siefp.siefp_enabled = 0;
|
|
siefp.base_siefp_gpa = 0;
|
|
|
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hv_set_siefp(siefp.as_uint64);
|
|
|
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/* Disable the global synic bit */
|
|
hv_get_synic_state(sctrl.as_uint64);
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|
sctrl.enable = 0;
|
|
hv_set_synic_state(sctrl.as_uint64);
|
|
|
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return 0;
|
|
}
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