![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>
482 lines
12 KiB
C
482 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2007 Google, Inc.
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* Copyright (C) 2012 Intel, Inc.
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* Copyright (C) 2017 Imagination Technologies Ltd.
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*/
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#include <linux/console.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/goldfish.h>
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#include <linux/mm.h>
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#include <linux/dma-mapping.h>
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#include <linux/serial_core.h>
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/* Goldfish tty register's offsets */
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#define GOLDFISH_TTY_REG_BYTES_READY 0x04
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#define GOLDFISH_TTY_REG_CMD 0x08
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#define GOLDFISH_TTY_REG_DATA_PTR 0x10
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#define GOLDFISH_TTY_REG_DATA_LEN 0x14
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#define GOLDFISH_TTY_REG_DATA_PTR_HIGH 0x18
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#define GOLDFISH_TTY_REG_VERSION 0x20
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/* Goldfish tty commands */
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#define GOLDFISH_TTY_CMD_INT_DISABLE 0
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#define GOLDFISH_TTY_CMD_INT_ENABLE 1
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#define GOLDFISH_TTY_CMD_WRITE_BUFFER 2
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#define GOLDFISH_TTY_CMD_READ_BUFFER 3
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struct goldfish_tty {
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struct tty_port port;
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spinlock_t lock;
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void __iomem *base;
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u32 irq;
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int opencount;
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struct console console;
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u32 version;
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struct device *dev;
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};
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static DEFINE_MUTEX(goldfish_tty_lock);
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static struct tty_driver *goldfish_tty_driver;
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static u32 goldfish_tty_line_count = 8;
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static u32 goldfish_tty_current_line_count;
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static struct goldfish_tty *goldfish_ttys;
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static void do_rw_io(struct goldfish_tty *qtty,
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unsigned long address,
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unsigned int count,
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int is_write)
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{
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unsigned long irq_flags;
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void __iomem *base = qtty->base;
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spin_lock_irqsave(&qtty->lock, irq_flags);
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gf_write_ptr((void *)address, base + GOLDFISH_TTY_REG_DATA_PTR,
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base + GOLDFISH_TTY_REG_DATA_PTR_HIGH);
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writel(count, base + GOLDFISH_TTY_REG_DATA_LEN);
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if (is_write)
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writel(GOLDFISH_TTY_CMD_WRITE_BUFFER,
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base + GOLDFISH_TTY_REG_CMD);
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else
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writel(GOLDFISH_TTY_CMD_READ_BUFFER,
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base + GOLDFISH_TTY_REG_CMD);
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spin_unlock_irqrestore(&qtty->lock, irq_flags);
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}
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static void goldfish_tty_rw(struct goldfish_tty *qtty,
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unsigned long addr,
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unsigned int count,
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int is_write)
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{
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dma_addr_t dma_handle;
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enum dma_data_direction dma_dir;
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dma_dir = (is_write ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
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if (qtty->version > 0) {
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/*
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* Goldfish TTY for Ranchu platform uses
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* physical addresses and DMA for read/write operations
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*/
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unsigned long addr_end = addr + count;
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while (addr < addr_end) {
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unsigned long pg_end = (addr & PAGE_MASK) + PAGE_SIZE;
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unsigned long next =
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pg_end < addr_end ? pg_end : addr_end;
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unsigned long avail = next - addr;
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/*
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* Map the buffer's virtual address to the DMA address
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* so the buffer can be accessed by the device.
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*/
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dma_handle = dma_map_single(qtty->dev, (void *)addr,
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avail, dma_dir);
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if (dma_mapping_error(qtty->dev, dma_handle)) {
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dev_err(qtty->dev, "tty: DMA mapping error.\n");
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return;
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}
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do_rw_io(qtty, dma_handle, avail, is_write);
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/*
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* Unmap the previously mapped region after
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* the completion of the read/write operation.
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*/
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dma_unmap_single(qtty->dev, dma_handle, avail, dma_dir);
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addr += avail;
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}
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} else {
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/*
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* Old style Goldfish TTY used on the Goldfish platform
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* uses virtual addresses.
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*/
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do_rw_io(qtty, addr, count, is_write);
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}
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}
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static void goldfish_tty_do_write(int line, const char *buf,
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unsigned int count)
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{
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struct goldfish_tty *qtty = &goldfish_ttys[line];
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unsigned long address = (unsigned long)(void *)buf;
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goldfish_tty_rw(qtty, address, count, 1);
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}
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static irqreturn_t goldfish_tty_interrupt(int irq, void *dev_id)
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{
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struct goldfish_tty *qtty = dev_id;
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void __iomem *base = qtty->base;
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unsigned long address;
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unsigned char *buf;
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u32 count;
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count = readl(base + GOLDFISH_TTY_REG_BYTES_READY);
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if (count == 0)
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return IRQ_NONE;
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count = tty_prepare_flip_string(&qtty->port, &buf, count);
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address = (unsigned long)(void *)buf;
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goldfish_tty_rw(qtty, address, count, 0);
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tty_schedule_flip(&qtty->port);
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return IRQ_HANDLED;
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}
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static int goldfish_tty_activate(struct tty_port *port, struct tty_struct *tty)
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{
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struct goldfish_tty *qtty = container_of(port, struct goldfish_tty,
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port);
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writel(GOLDFISH_TTY_CMD_INT_ENABLE, qtty->base + GOLDFISH_TTY_REG_CMD);
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return 0;
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}
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static void goldfish_tty_shutdown(struct tty_port *port)
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{
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struct goldfish_tty *qtty = container_of(port, struct goldfish_tty,
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port);
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writel(GOLDFISH_TTY_CMD_INT_DISABLE, qtty->base + GOLDFISH_TTY_REG_CMD);
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}
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static int goldfish_tty_open(struct tty_struct *tty, struct file *filp)
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{
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struct goldfish_tty *qtty = &goldfish_ttys[tty->index];
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return tty_port_open(&qtty->port, tty, filp);
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}
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static void goldfish_tty_close(struct tty_struct *tty, struct file *filp)
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{
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tty_port_close(tty->port, tty, filp);
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}
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static void goldfish_tty_hangup(struct tty_struct *tty)
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{
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tty_port_hangup(tty->port);
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}
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static int goldfish_tty_write(struct tty_struct *tty, const unsigned char *buf,
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int count)
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{
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goldfish_tty_do_write(tty->index, buf, count);
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return count;
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}
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static int goldfish_tty_write_room(struct tty_struct *tty)
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{
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return 0x10000;
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}
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static int goldfish_tty_chars_in_buffer(struct tty_struct *tty)
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{
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struct goldfish_tty *qtty = &goldfish_ttys[tty->index];
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void __iomem *base = qtty->base;
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return readl(base + GOLDFISH_TTY_REG_BYTES_READY);
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}
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static void goldfish_tty_console_write(struct console *co, const char *b,
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unsigned count)
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{
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goldfish_tty_do_write(co->index, b, count);
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}
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static struct tty_driver *goldfish_tty_console_device(struct console *c,
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int *index)
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{
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*index = c->index;
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return goldfish_tty_driver;
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}
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static int goldfish_tty_console_setup(struct console *co, char *options)
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{
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if ((unsigned)co->index >= goldfish_tty_line_count)
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return -ENODEV;
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if (!goldfish_ttys[co->index].base)
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return -ENODEV;
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return 0;
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}
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static const struct tty_port_operations goldfish_port_ops = {
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.activate = goldfish_tty_activate,
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.shutdown = goldfish_tty_shutdown
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};
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static const struct tty_operations goldfish_tty_ops = {
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.open = goldfish_tty_open,
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.close = goldfish_tty_close,
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.hangup = goldfish_tty_hangup,
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.write = goldfish_tty_write,
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.write_room = goldfish_tty_write_room,
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.chars_in_buffer = goldfish_tty_chars_in_buffer,
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};
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static int goldfish_tty_create_driver(void)
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{
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int ret;
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struct tty_driver *tty;
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goldfish_ttys = kcalloc(goldfish_tty_line_count,
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sizeof(*goldfish_ttys),
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GFP_KERNEL);
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if (goldfish_ttys == NULL) {
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ret = -ENOMEM;
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goto err_alloc_goldfish_ttys_failed;
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}
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tty = alloc_tty_driver(goldfish_tty_line_count);
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if (tty == NULL) {
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ret = -ENOMEM;
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goto err_alloc_tty_driver_failed;
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}
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tty->driver_name = "goldfish";
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tty->name = "ttyGF";
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tty->type = TTY_DRIVER_TYPE_SERIAL;
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tty->subtype = SERIAL_TYPE_NORMAL;
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tty->init_termios = tty_std_termios;
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tty->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW |
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TTY_DRIVER_DYNAMIC_DEV;
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tty_set_operations(tty, &goldfish_tty_ops);
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ret = tty_register_driver(tty);
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if (ret)
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goto err_tty_register_driver_failed;
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goldfish_tty_driver = tty;
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return 0;
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err_tty_register_driver_failed:
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put_tty_driver(tty);
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err_alloc_tty_driver_failed:
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kfree(goldfish_ttys);
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goldfish_ttys = NULL;
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err_alloc_goldfish_ttys_failed:
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return ret;
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}
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static void goldfish_tty_delete_driver(void)
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{
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tty_unregister_driver(goldfish_tty_driver);
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put_tty_driver(goldfish_tty_driver);
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goldfish_tty_driver = NULL;
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kfree(goldfish_ttys);
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goldfish_ttys = NULL;
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}
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static int goldfish_tty_probe(struct platform_device *pdev)
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{
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struct goldfish_tty *qtty;
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int ret = -ENODEV;
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struct resource *r;
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struct device *ttydev;
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void __iomem *base;
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u32 irq;
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unsigned int line;
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r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!r) {
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pr_err("goldfish_tty: No MEM resource available!\n");
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return -ENOMEM;
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}
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base = ioremap(r->start, 0x1000);
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if (!base) {
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pr_err("goldfish_tty: Unable to ioremap base!\n");
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return -ENOMEM;
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}
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r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
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if (!r) {
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pr_err("goldfish_tty: No IRQ resource available!\n");
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goto err_unmap;
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}
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irq = r->start;
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mutex_lock(&goldfish_tty_lock);
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if (pdev->id == PLATFORM_DEVID_NONE)
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line = goldfish_tty_current_line_count;
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else
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line = pdev->id;
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if (line >= goldfish_tty_line_count) {
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pr_err("goldfish_tty: Reached maximum tty number of %d.\n",
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goldfish_tty_current_line_count);
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ret = -ENOMEM;
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goto err_unlock;
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}
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if (goldfish_tty_current_line_count == 0) {
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ret = goldfish_tty_create_driver();
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if (ret)
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goto err_unlock;
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}
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goldfish_tty_current_line_count++;
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qtty = &goldfish_ttys[line];
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spin_lock_init(&qtty->lock);
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tty_port_init(&qtty->port);
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qtty->port.ops = &goldfish_port_ops;
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qtty->base = base;
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qtty->irq = irq;
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qtty->dev = &pdev->dev;
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/*
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* Goldfish TTY device used by the Goldfish emulator
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* should identify itself with 0, forcing the driver
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* to use virtual addresses. Goldfish TTY device
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* on Ranchu emulator (qemu2) returns 1 here and
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* driver will use physical addresses.
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*/
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qtty->version = readl(base + GOLDFISH_TTY_REG_VERSION);
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/*
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* Goldfish TTY device on Ranchu emulator (qemu2)
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* will use DMA for read/write IO operations.
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*/
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if (qtty->version > 0) {
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/*
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* Initialize dma_mask to 32-bits.
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*/
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if (!pdev->dev.dma_mask)
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pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
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ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
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if (ret) {
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dev_err(&pdev->dev, "No suitable DMA available.\n");
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goto err_dec_line_count;
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}
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|
}
|
|
|
|
writel(GOLDFISH_TTY_CMD_INT_DISABLE, base + GOLDFISH_TTY_REG_CMD);
|
|
|
|
ret = request_irq(irq, goldfish_tty_interrupt, IRQF_SHARED,
|
|
"goldfish_tty", qtty);
|
|
if (ret) {
|
|
pr_err("goldfish_tty: No IRQ available!\n");
|
|
goto err_dec_line_count;
|
|
}
|
|
|
|
ttydev = tty_port_register_device(&qtty->port, goldfish_tty_driver,
|
|
line, &pdev->dev);
|
|
if (IS_ERR(ttydev)) {
|
|
ret = PTR_ERR(ttydev);
|
|
goto err_tty_register_device_failed;
|
|
}
|
|
|
|
strcpy(qtty->console.name, "ttyGF");
|
|
qtty->console.write = goldfish_tty_console_write;
|
|
qtty->console.device = goldfish_tty_console_device;
|
|
qtty->console.setup = goldfish_tty_console_setup;
|
|
qtty->console.flags = CON_PRINTBUFFER;
|
|
qtty->console.index = line;
|
|
register_console(&qtty->console);
|
|
platform_set_drvdata(pdev, qtty);
|
|
|
|
mutex_unlock(&goldfish_tty_lock);
|
|
return 0;
|
|
|
|
err_tty_register_device_failed:
|
|
free_irq(irq, qtty);
|
|
err_dec_line_count:
|
|
goldfish_tty_current_line_count--;
|
|
if (goldfish_tty_current_line_count == 0)
|
|
goldfish_tty_delete_driver();
|
|
err_unlock:
|
|
mutex_unlock(&goldfish_tty_lock);
|
|
err_unmap:
|
|
iounmap(base);
|
|
return ret;
|
|
}
|
|
|
|
static int goldfish_tty_remove(struct platform_device *pdev)
|
|
{
|
|
struct goldfish_tty *qtty = platform_get_drvdata(pdev);
|
|
|
|
mutex_lock(&goldfish_tty_lock);
|
|
|
|
unregister_console(&qtty->console);
|
|
tty_unregister_device(goldfish_tty_driver, qtty->console.index);
|
|
iounmap(qtty->base);
|
|
qtty->base = NULL;
|
|
free_irq(qtty->irq, pdev);
|
|
goldfish_tty_current_line_count--;
|
|
if (goldfish_tty_current_line_count == 0)
|
|
goldfish_tty_delete_driver();
|
|
mutex_unlock(&goldfish_tty_lock);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_GOLDFISH_TTY_EARLY_CONSOLE
|
|
static void gf_early_console_putchar(struct uart_port *port, int ch)
|
|
{
|
|
__raw_writel(ch, port->membase);
|
|
}
|
|
|
|
static void gf_early_write(struct console *con, const char *s, unsigned int n)
|
|
{
|
|
struct earlycon_device *dev = con->data;
|
|
|
|
uart_console_write(&dev->port, s, n, gf_early_console_putchar);
|
|
}
|
|
|
|
static int __init gf_earlycon_setup(struct earlycon_device *device,
|
|
const char *opt)
|
|
{
|
|
if (!device->port.membase)
|
|
return -ENODEV;
|
|
|
|
device->con->write = gf_early_write;
|
|
return 0;
|
|
}
|
|
|
|
OF_EARLYCON_DECLARE(early_gf_tty, "google,goldfish-tty", gf_earlycon_setup);
|
|
#endif
|
|
|
|
static const struct of_device_id goldfish_tty_of_match[] = {
|
|
{ .compatible = "google,goldfish-tty", },
|
|
{},
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, goldfish_tty_of_match);
|
|
|
|
static struct platform_driver goldfish_tty_platform_driver = {
|
|
.probe = goldfish_tty_probe,
|
|
.remove = goldfish_tty_remove,
|
|
.driver = {
|
|
.name = "goldfish_tty",
|
|
.of_match_table = goldfish_tty_of_match,
|
|
}
|
|
};
|
|
|
|
module_platform_driver(goldfish_tty_platform_driver);
|
|
|
|
MODULE_LICENSE("GPL v2");
|