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 devm_kzalloc() function has a 2-factor argument form, devm_kcalloc(). This patch replaces cases of: devm_kzalloc(handle, a * b, gfp) with: devm_kcalloc(handle, a * b, gfp) as well as handling cases of: devm_kzalloc(handle, a * b * c, gfp) with: devm_kzalloc(handle, array3_size(a, b, c), gfp) as it's slightly less ugly than: devm_kcalloc(handle, array_size(a, b), c, gfp) This does, however, attempt to ignore constant size factors like: devm_kzalloc(handle, 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. Some manual whitespace fixes were needed in this patch, as Coccinelle really liked to write "=devm_kcalloc..." instead of "= devm_kcalloc...". The Coccinelle script used for this was: // Fix redundant parens around sizeof(). @@ expression HANDLE; type TYPE; expression THING, E; @@ ( devm_kzalloc(HANDLE, - (sizeof(TYPE)) * E + sizeof(TYPE) * E , ...) | devm_kzalloc(HANDLE, - (sizeof(THING)) * E + sizeof(THING) * E , ...) ) // Drop single-byte sizes and redundant parens. @@ expression HANDLE; expression COUNT; typedef u8; typedef __u8; @@ ( devm_kzalloc(HANDLE, - sizeof(u8) * (COUNT) + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(__u8) * (COUNT) + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(char) * (COUNT) + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(unsigned char) * (COUNT) + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(u8) * COUNT + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(__u8) * COUNT + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(char) * COUNT + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(unsigned char) * COUNT + COUNT , ...) ) // 2-factor product with sizeof(type/expression) and identifier or constant. @@ expression HANDLE; type TYPE; expression THING; identifier COUNT_ID; constant COUNT_CONST; @@ ( - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * (COUNT_ID) + COUNT_ID, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * COUNT_ID + COUNT_ID, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * (COUNT_CONST) + COUNT_CONST, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * COUNT_CONST + COUNT_CONST, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * (COUNT_ID) + COUNT_ID, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * COUNT_ID + COUNT_ID, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * (COUNT_CONST) + COUNT_CONST, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * COUNT_CONST + COUNT_CONST, sizeof(THING) , ...) ) // 2-factor product, only identifiers. @@ expression HANDLE; identifier SIZE, COUNT; @@ - devm_kzalloc + devm_kcalloc (HANDLE, - SIZE * COUNT + COUNT, SIZE , ...) // 3-factor product with 1 sizeof(type) or sizeof(expression), with // redundant parens removed. @@ expression HANDLE; expression THING; identifier STRIDE, COUNT; type TYPE; @@ ( devm_kzalloc(HANDLE, - sizeof(TYPE) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) ) // 3-factor product with 2 sizeof(variable), with redundant parens removed. @@ expression HANDLE; expression THING1, THING2; identifier COUNT; type TYPE1, TYPE2; @@ ( devm_kzalloc(HANDLE, - sizeof(TYPE1) * sizeof(TYPE2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) ) // 3-factor product, only identifiers, with redundant parens removed. @@ expression HANDLE; identifier STRIDE, SIZE, COUNT; @@ ( devm_kzalloc(HANDLE, - (COUNT) * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - COUNT * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - COUNT * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - (COUNT) * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - COUNT * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - (COUNT) * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - (COUNT) * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - 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 HANDLE; expression E1, E2, E3; constant C1, C2, C3; @@ ( devm_kzalloc(HANDLE, C1 * C2 * C3, ...) | devm_kzalloc(HANDLE, - (E1) * E2 * E3 + array3_size(E1, E2, E3) , ...) | devm_kzalloc(HANDLE, - (E1) * (E2) * E3 + array3_size(E1, E2, E3) , ...) | devm_kzalloc(HANDLE, - (E1) * (E2) * (E3) + array3_size(E1, E2, E3) , ...) | devm_kzalloc(HANDLE, - 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 HANDLE; expression THING, E1, E2; type TYPE; constant C1, C2, C3; @@ ( devm_kzalloc(HANDLE, sizeof(THING) * C2, ...) | devm_kzalloc(HANDLE, sizeof(TYPE) * C2, ...) | devm_kzalloc(HANDLE, C1 * C2 * C3, ...) | devm_kzalloc(HANDLE, C1 * C2, ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * (E2) + E2, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * E2 + E2, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * (E2) + E2, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * E2 + E2, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - (E1) * E2 + E1, E2 , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - (E1) * (E2) + E1, E2 , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - E1 * E2 + E1, E2 , ...) ) Signed-off-by: Kees Cook <keescook@chromium.org>
395 lines
9.7 KiB
C
395 lines
9.7 KiB
C
/*
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* Hisilicon's Hi6220 mailbox driver
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*
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* Copyright (c) 2015 Hisilicon Limited.
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* Copyright (c) 2015 Linaro Limited.
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*
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* Author: Leo Yan <leo.yan@linaro.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/kfifo.h>
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#include <linux/mailbox_controller.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#define MBOX_CHAN_MAX 32
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#define MBOX_TX 0x1
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/* Mailbox message length: 8 words */
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#define MBOX_MSG_LEN 8
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/* Mailbox Registers */
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#define MBOX_OFF(m) (0x40 * (m))
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#define MBOX_MODE_REG(m) (MBOX_OFF(m) + 0x0)
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#define MBOX_DATA_REG(m) (MBOX_OFF(m) + 0x4)
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#define MBOX_STATE_MASK (0xF << 4)
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#define MBOX_STATE_IDLE (0x1 << 4)
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#define MBOX_STATE_TX (0x2 << 4)
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#define MBOX_STATE_RX (0x4 << 4)
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#define MBOX_STATE_ACK (0x8 << 4)
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#define MBOX_ACK_CONFIG_MASK (0x1 << 0)
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#define MBOX_ACK_AUTOMATIC (0x1 << 0)
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#define MBOX_ACK_IRQ (0x0 << 0)
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/* IPC registers */
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#define ACK_INT_RAW_REG(i) ((i) + 0x400)
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#define ACK_INT_MSK_REG(i) ((i) + 0x404)
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#define ACK_INT_STAT_REG(i) ((i) + 0x408)
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#define ACK_INT_CLR_REG(i) ((i) + 0x40c)
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#define ACK_INT_ENA_REG(i) ((i) + 0x500)
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#define ACK_INT_DIS_REG(i) ((i) + 0x504)
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#define DST_INT_RAW_REG(i) ((i) + 0x420)
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struct hi6220_mbox_chan {
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/*
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* Description for channel's hardware info:
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* - direction: tx or rx
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* - dst irq: peer core's irq number
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* - ack irq: local irq number
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* - slot number
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*/
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unsigned int dir, dst_irq, ack_irq;
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unsigned int slot;
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struct hi6220_mbox *parent;
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};
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struct hi6220_mbox {
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struct device *dev;
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int irq;
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/* flag of enabling tx's irq mode */
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bool tx_irq_mode;
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/* region for ipc event */
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void __iomem *ipc;
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/* region for mailbox */
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void __iomem *base;
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unsigned int chan_num;
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struct hi6220_mbox_chan *mchan;
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void *irq_map_chan[MBOX_CHAN_MAX];
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struct mbox_chan *chan;
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struct mbox_controller controller;
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};
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static void mbox_set_state(struct hi6220_mbox *mbox,
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unsigned int slot, u32 val)
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{
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u32 status;
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status = readl(mbox->base + MBOX_MODE_REG(slot));
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status = (status & ~MBOX_STATE_MASK) | val;
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writel(status, mbox->base + MBOX_MODE_REG(slot));
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}
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static void mbox_set_mode(struct hi6220_mbox *mbox,
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unsigned int slot, u32 val)
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{
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u32 mode;
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mode = readl(mbox->base + MBOX_MODE_REG(slot));
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mode = (mode & ~MBOX_ACK_CONFIG_MASK) | val;
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writel(mode, mbox->base + MBOX_MODE_REG(slot));
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}
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static bool hi6220_mbox_last_tx_done(struct mbox_chan *chan)
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{
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struct hi6220_mbox_chan *mchan = chan->con_priv;
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struct hi6220_mbox *mbox = mchan->parent;
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u32 state;
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/* Only set idle state for polling mode */
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BUG_ON(mbox->tx_irq_mode);
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state = readl(mbox->base + MBOX_MODE_REG(mchan->slot));
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return ((state & MBOX_STATE_MASK) == MBOX_STATE_IDLE);
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}
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static int hi6220_mbox_send_data(struct mbox_chan *chan, void *msg)
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{
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struct hi6220_mbox_chan *mchan = chan->con_priv;
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struct hi6220_mbox *mbox = mchan->parent;
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unsigned int slot = mchan->slot;
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u32 *buf = msg;
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int i;
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/* indicate as a TX channel */
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mchan->dir = MBOX_TX;
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mbox_set_state(mbox, slot, MBOX_STATE_TX);
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if (mbox->tx_irq_mode)
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mbox_set_mode(mbox, slot, MBOX_ACK_IRQ);
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else
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mbox_set_mode(mbox, slot, MBOX_ACK_AUTOMATIC);
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for (i = 0; i < MBOX_MSG_LEN; i++)
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writel(buf[i], mbox->base + MBOX_DATA_REG(slot) + i * 4);
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/* trigger remote request */
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writel(BIT(mchan->dst_irq), DST_INT_RAW_REG(mbox->ipc));
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return 0;
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}
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static irqreturn_t hi6220_mbox_interrupt(int irq, void *p)
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{
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struct hi6220_mbox *mbox = p;
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struct hi6220_mbox_chan *mchan;
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struct mbox_chan *chan;
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unsigned int state, intr_bit, i;
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u32 msg[MBOX_MSG_LEN];
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state = readl(ACK_INT_STAT_REG(mbox->ipc));
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if (!state) {
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dev_warn(mbox->dev, "%s: spurious interrupt\n",
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__func__);
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return IRQ_HANDLED;
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}
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while (state) {
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intr_bit = __ffs(state);
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state &= (state - 1);
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chan = mbox->irq_map_chan[intr_bit];
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if (!chan) {
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dev_warn(mbox->dev, "%s: unexpected irq vector %d\n",
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__func__, intr_bit);
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continue;
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}
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mchan = chan->con_priv;
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if (mchan->dir == MBOX_TX)
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mbox_chan_txdone(chan, 0);
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else {
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for (i = 0; i < MBOX_MSG_LEN; i++)
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msg[i] = readl(mbox->base +
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MBOX_DATA_REG(mchan->slot) + i * 4);
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mbox_chan_received_data(chan, (void *)msg);
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}
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/* clear IRQ source */
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writel(BIT(mchan->ack_irq), ACK_INT_CLR_REG(mbox->ipc));
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mbox_set_state(mbox, mchan->slot, MBOX_STATE_IDLE);
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}
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return IRQ_HANDLED;
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}
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static int hi6220_mbox_startup(struct mbox_chan *chan)
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{
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struct hi6220_mbox_chan *mchan = chan->con_priv;
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struct hi6220_mbox *mbox = mchan->parent;
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mchan->dir = 0;
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/* enable interrupt */
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writel(BIT(mchan->ack_irq), ACK_INT_ENA_REG(mbox->ipc));
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return 0;
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}
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static void hi6220_mbox_shutdown(struct mbox_chan *chan)
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{
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struct hi6220_mbox_chan *mchan = chan->con_priv;
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struct hi6220_mbox *mbox = mchan->parent;
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/* disable interrupt */
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writel(BIT(mchan->ack_irq), ACK_INT_DIS_REG(mbox->ipc));
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mbox->irq_map_chan[mchan->ack_irq] = NULL;
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}
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static const struct mbox_chan_ops hi6220_mbox_ops = {
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.send_data = hi6220_mbox_send_data,
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.startup = hi6220_mbox_startup,
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.shutdown = hi6220_mbox_shutdown,
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.last_tx_done = hi6220_mbox_last_tx_done,
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};
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static struct mbox_chan *hi6220_mbox_xlate(struct mbox_controller *controller,
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const struct of_phandle_args *spec)
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{
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struct hi6220_mbox *mbox = dev_get_drvdata(controller->dev);
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struct hi6220_mbox_chan *mchan;
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struct mbox_chan *chan;
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unsigned int i = spec->args[0];
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unsigned int dst_irq = spec->args[1];
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unsigned int ack_irq = spec->args[2];
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/* Bounds checking */
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if (i >= mbox->chan_num || dst_irq >= mbox->chan_num ||
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ack_irq >= mbox->chan_num) {
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dev_err(mbox->dev,
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"Invalid channel idx %d dst_irq %d ack_irq %d\n",
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i, dst_irq, ack_irq);
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return ERR_PTR(-EINVAL);
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}
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/* Is requested channel free? */
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chan = &mbox->chan[i];
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if (mbox->irq_map_chan[ack_irq] == (void *)chan) {
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dev_err(mbox->dev, "Channel in use\n");
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return ERR_PTR(-EBUSY);
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}
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mchan = chan->con_priv;
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mchan->dst_irq = dst_irq;
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mchan->ack_irq = ack_irq;
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mbox->irq_map_chan[ack_irq] = (void *)chan;
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return chan;
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}
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static const struct of_device_id hi6220_mbox_of_match[] = {
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{ .compatible = "hisilicon,hi6220-mbox", },
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{},
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};
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MODULE_DEVICE_TABLE(of, hi6220_mbox_of_match);
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static int hi6220_mbox_probe(struct platform_device *pdev)
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{
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struct device_node *node = pdev->dev.of_node;
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struct device *dev = &pdev->dev;
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struct hi6220_mbox *mbox;
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struct resource *res;
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int i, err;
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mbox = devm_kzalloc(dev, sizeof(*mbox), GFP_KERNEL);
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if (!mbox)
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return -ENOMEM;
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mbox->dev = dev;
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mbox->chan_num = MBOX_CHAN_MAX;
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mbox->mchan = devm_kcalloc(dev,
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mbox->chan_num, sizeof(*mbox->mchan), GFP_KERNEL);
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if (!mbox->mchan)
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return -ENOMEM;
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mbox->chan = devm_kcalloc(dev,
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mbox->chan_num, sizeof(*mbox->chan), GFP_KERNEL);
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if (!mbox->chan)
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return -ENOMEM;
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mbox->irq = platform_get_irq(pdev, 0);
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if (mbox->irq < 0)
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return mbox->irq;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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mbox->ipc = devm_ioremap_resource(dev, res);
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if (IS_ERR(mbox->ipc)) {
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dev_err(dev, "ioremap ipc failed\n");
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return PTR_ERR(mbox->ipc);
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}
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res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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mbox->base = devm_ioremap_resource(dev, res);
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if (IS_ERR(mbox->base)) {
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dev_err(dev, "ioremap buffer failed\n");
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return PTR_ERR(mbox->base);
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}
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err = devm_request_irq(dev, mbox->irq, hi6220_mbox_interrupt, 0,
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dev_name(dev), mbox);
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if (err) {
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dev_err(dev, "Failed to register a mailbox IRQ handler: %d\n",
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err);
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return -ENODEV;
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}
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mbox->controller.dev = dev;
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mbox->controller.chans = &mbox->chan[0];
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mbox->controller.num_chans = mbox->chan_num;
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mbox->controller.ops = &hi6220_mbox_ops;
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mbox->controller.of_xlate = hi6220_mbox_xlate;
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for (i = 0; i < mbox->chan_num; i++) {
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mbox->chan[i].con_priv = &mbox->mchan[i];
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mbox->irq_map_chan[i] = NULL;
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mbox->mchan[i].parent = mbox;
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mbox->mchan[i].slot = i;
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}
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/* mask and clear all interrupt vectors */
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writel(0x0, ACK_INT_MSK_REG(mbox->ipc));
|
|
writel(~0x0, ACK_INT_CLR_REG(mbox->ipc));
|
|
|
|
/* use interrupt for tx's ack */
|
|
if (of_find_property(node, "hi6220,mbox-tx-noirq", NULL))
|
|
mbox->tx_irq_mode = false;
|
|
else
|
|
mbox->tx_irq_mode = true;
|
|
|
|
if (mbox->tx_irq_mode)
|
|
mbox->controller.txdone_irq = true;
|
|
else {
|
|
mbox->controller.txdone_poll = true;
|
|
mbox->controller.txpoll_period = 5;
|
|
}
|
|
|
|
err = mbox_controller_register(&mbox->controller);
|
|
if (err) {
|
|
dev_err(dev, "Failed to register mailbox %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, mbox);
|
|
dev_info(dev, "Mailbox enabled\n");
|
|
return 0;
|
|
}
|
|
|
|
static int hi6220_mbox_remove(struct platform_device *pdev)
|
|
{
|
|
struct hi6220_mbox *mbox = platform_get_drvdata(pdev);
|
|
|
|
mbox_controller_unregister(&mbox->controller);
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver hi6220_mbox_driver = {
|
|
.driver = {
|
|
.name = "hi6220-mbox",
|
|
.owner = THIS_MODULE,
|
|
.of_match_table = hi6220_mbox_of_match,
|
|
},
|
|
.probe = hi6220_mbox_probe,
|
|
.remove = hi6220_mbox_remove,
|
|
};
|
|
|
|
static int __init hi6220_mbox_init(void)
|
|
{
|
|
return platform_driver_register(&hi6220_mbox_driver);
|
|
}
|
|
core_initcall(hi6220_mbox_init);
|
|
|
|
static void __exit hi6220_mbox_exit(void)
|
|
{
|
|
platform_driver_unregister(&hi6220_mbox_driver);
|
|
}
|
|
module_exit(hi6220_mbox_exit);
|
|
|
|
MODULE_AUTHOR("Leo Yan <leo.yan@linaro.org>");
|
|
MODULE_DESCRIPTION("Hi6220 mailbox driver");
|
|
MODULE_LICENSE("GPL v2");
|