diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/staging/gasket/gasket_ioctl.c | 391 |
1 files changed, 391 insertions, 0 deletions
diff --git a/drivers/staging/gasket/gasket_ioctl.c b/drivers/staging/gasket/gasket_ioctl.c new file mode 100644 index 000000000000..0ca48e688818 --- /dev/null +++ b/drivers/staging/gasket/gasket_ioctl.c @@ -0,0 +1,391 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) 2018 Google, Inc. */ +#include "gasket.h" +#include "gasket_ioctl.h" +#include "gasket_constants.h" +#include "gasket_core.h" +#include "gasket_interrupt.h" +#include "gasket_page_table.h" +#include <linux/compiler.h> +#include <linux/device.h> +#include <linux/fs.h> +#include <linux/uaccess.h> + +#ifdef GASKET_KERNEL_TRACE_SUPPORT +#define CREATE_TRACE_POINTS +#include <trace/events/gasket_ioctl.h> +#else +#define trace_gasket_ioctl_entry(x, ...) +#define trace_gasket_ioctl_exit(x) +#define trace_gasket_ioctl_integer_data(x) +#define trace_gasket_ioctl_eventfd_data(x, ...) +#define trace_gasket_ioctl_page_table_data(x, ...) +#define trace_gasket_ioctl_config_coherent_allocator(x, ...) +#endif + +/* Associate an eventfd with an interrupt. */ +static int gasket_set_event_fd(struct gasket_dev *gasket_dev, + struct gasket_interrupt_eventfd __user *argp) +{ + struct gasket_interrupt_eventfd die; + + if (copy_from_user(&die, argp, sizeof(struct gasket_interrupt_eventfd))) + return -EFAULT; + + trace_gasket_ioctl_eventfd_data(die.interrupt, die.event_fd); + + return gasket_interrupt_set_eventfd( + gasket_dev->interrupt_data, die.interrupt, die.event_fd); +} + +/* Read the size of the page table. */ +static int gasket_read_page_table_size( + struct gasket_dev *gasket_dev, + struct gasket_page_table_ioctl __user *argp) +{ + int ret = 0; + struct gasket_page_table_ioctl ibuf; + + if (copy_from_user(&ibuf, argp, sizeof(struct gasket_page_table_ioctl))) + return -EFAULT; + + if (ibuf.page_table_index >= gasket_dev->num_page_tables) + return -EFAULT; + + ibuf.size = gasket_page_table_num_entries( + gasket_dev->page_table[ibuf.page_table_index]); + + trace_gasket_ioctl_page_table_data( + ibuf.page_table_index, ibuf.size, ibuf.host_address, + ibuf.device_address); + + if (copy_to_user(argp, &ibuf, sizeof(ibuf))) + return -EFAULT; + + return ret; +} + +/* Read the size of the simple page table. */ +static int gasket_read_simple_page_table_size( + struct gasket_dev *gasket_dev, + struct gasket_page_table_ioctl __user *argp) +{ + int ret = 0; + struct gasket_page_table_ioctl ibuf; + + if (copy_from_user(&ibuf, argp, sizeof(struct gasket_page_table_ioctl))) + return -EFAULT; + + if (ibuf.page_table_index >= gasket_dev->num_page_tables) + return -EFAULT; + + ibuf.size = + gasket_page_table_num_simple_entries(gasket_dev->page_table[ibuf.page_table_index]); + + trace_gasket_ioctl_page_table_data(ibuf.page_table_index, ibuf.size, + ibuf.host_address, + ibuf.device_address); + + if (copy_to_user(argp, &ibuf, sizeof(ibuf))) + return -EFAULT; + + return ret; +} + +/* Set the boundary between the simple and extended page tables. */ +static int gasket_partition_page_table( + struct gasket_dev *gasket_dev, + struct gasket_page_table_ioctl __user *argp) +{ + int ret; + struct gasket_page_table_ioctl ibuf; + uint max_page_table_size; + + if (copy_from_user(&ibuf, argp, sizeof(struct gasket_page_table_ioctl))) + return -EFAULT; + + trace_gasket_ioctl_page_table_data( + ibuf.page_table_index, ibuf.size, ibuf.host_address, + ibuf.device_address); + + if (ibuf.page_table_index >= gasket_dev->num_page_tables) + return -EFAULT; + max_page_table_size = gasket_page_table_max_size( + gasket_dev->page_table[ibuf.page_table_index]); + + if (ibuf.size > max_page_table_size) { + dev_dbg(gasket_dev->dev, + "Partition request 0x%llx too large, max is 0x%x\n", + ibuf.size, max_page_table_size); + return -EINVAL; + } + + mutex_lock(&gasket_dev->mutex); + + ret = gasket_page_table_partition( + gasket_dev->page_table[ibuf.page_table_index], ibuf.size); + mutex_unlock(&gasket_dev->mutex); + + return ret; +} + +/* Map a userspace buffer to a device virtual address. */ +static int gasket_map_buffers(struct gasket_dev *gasket_dev, + struct gasket_page_table_ioctl __user *argp) +{ + struct gasket_page_table_ioctl ibuf; + + if (copy_from_user(&ibuf, argp, sizeof(struct gasket_page_table_ioctl))) + return -EFAULT; + + trace_gasket_ioctl_page_table_data(ibuf.page_table_index, ibuf.size, + ibuf.host_address, + ibuf.device_address); + + if (ibuf.page_table_index >= gasket_dev->num_page_tables) + return -EFAULT; + + if (gasket_page_table_are_addrs_bad(gasket_dev->page_table[ibuf.page_table_index], + ibuf.host_address, + ibuf.device_address, ibuf.size)) + return -EINVAL; + + return gasket_page_table_map(gasket_dev->page_table[ibuf.page_table_index], + ibuf.host_address, ibuf.device_address, + ibuf.size / PAGE_SIZE); +} + +/* Unmap a userspace buffer from a device virtual address. */ +static int gasket_unmap_buffers(struct gasket_dev *gasket_dev, + struct gasket_page_table_ioctl __user *argp) +{ + struct gasket_page_table_ioctl ibuf; + + if (copy_from_user(&ibuf, argp, sizeof(struct gasket_page_table_ioctl))) + return -EFAULT; + + trace_gasket_ioctl_page_table_data(ibuf.page_table_index, ibuf.size, + ibuf.host_address, + ibuf.device_address); + + if (ibuf.page_table_index >= gasket_dev->num_page_tables) + return -EFAULT; + + if (gasket_page_table_is_dev_addr_bad(gasket_dev->page_table[ibuf.page_table_index], + ibuf.device_address, ibuf.size)) + return -EINVAL; + + gasket_page_table_unmap(gasket_dev->page_table[ibuf.page_table_index], + ibuf.device_address, ibuf.size / PAGE_SIZE); + + return 0; +} + +/* + * Reserve structures for coherent allocation, and allocate or free the + * corresponding memory. + */ +static int gasket_config_coherent_allocator( + struct gasket_dev *gasket_dev, + struct gasket_coherent_alloc_config_ioctl __user *argp) +{ + int ret; + struct gasket_coherent_alloc_config_ioctl ibuf; + + if (copy_from_user(&ibuf, argp, + sizeof(struct gasket_coherent_alloc_config_ioctl))) + return -EFAULT; + + trace_gasket_ioctl_config_coherent_allocator(ibuf.enable, ibuf.size, + ibuf.dma_address); + + if (ibuf.page_table_index >= gasket_dev->num_page_tables) + return -EFAULT; + + if (ibuf.size > PAGE_SIZE * MAX_NUM_COHERENT_PAGES) + return -ENOMEM; + + if (ibuf.enable == 0) { + ret = gasket_free_coherent_memory(gasket_dev, ibuf.size, + ibuf.dma_address, + ibuf.page_table_index); + } else { + ret = gasket_alloc_coherent_memory(gasket_dev, ibuf.size, + &ibuf.dma_address, + ibuf.page_table_index); + } + if (ret) + return ret; + if (copy_to_user(argp, &ibuf, sizeof(ibuf))) + return -EFAULT; + + return 0; +} + +/* Check permissions for Gasket ioctls. */ +static bool gasket_ioctl_check_permissions(struct file *filp, uint cmd) +{ + bool alive; + bool read, write; + struct gasket_dev *gasket_dev = (struct gasket_dev *)filp->private_data; + + alive = (gasket_dev->status == GASKET_STATUS_ALIVE); + if (!alive) + dev_dbg(gasket_dev->dev, "%s alive %d status %d\n", + __func__, alive, gasket_dev->status); + + read = !!(filp->f_mode & FMODE_READ); + write = !!(filp->f_mode & FMODE_WRITE); + + switch (cmd) { + case GASKET_IOCTL_RESET: + case GASKET_IOCTL_CLEAR_INTERRUPT_COUNTS: + return write; + + case GASKET_IOCTL_PAGE_TABLE_SIZE: + case GASKET_IOCTL_SIMPLE_PAGE_TABLE_SIZE: + case GASKET_IOCTL_NUMBER_PAGE_TABLES: + return read; + + case GASKET_IOCTL_PARTITION_PAGE_TABLE: + case GASKET_IOCTL_CONFIG_COHERENT_ALLOCATOR: + return alive && write; + + case GASKET_IOCTL_MAP_BUFFER: + case GASKET_IOCTL_UNMAP_BUFFER: + return alive && write; + + case GASKET_IOCTL_CLEAR_EVENTFD: + case GASKET_IOCTL_SET_EVENTFD: + return alive && write; + } + + return false; /* unknown permissions */ +} + +/* + * standard ioctl dispatch function. + * @filp: File structure pointer describing this node usage session. + * @cmd: ioctl number to handle. + * @argp: ioctl-specific data pointer. + * + * Standard ioctl dispatcher; forwards operations to individual handlers. + */ +long gasket_handle_ioctl(struct file *filp, uint cmd, void __user *argp) +{ + struct gasket_dev *gasket_dev; + unsigned long arg = (unsigned long)argp; + gasket_ioctl_permissions_cb_t ioctl_permissions_cb; + int retval; + + gasket_dev = (struct gasket_dev *)filp->private_data; + trace_gasket_ioctl_entry(gasket_dev->dev_info.name, cmd); + + ioctl_permissions_cb = gasket_get_ioctl_permissions_cb(gasket_dev); + if (ioctl_permissions_cb) { + retval = ioctl_permissions_cb(filp, cmd, argp); + if (retval < 0) { + trace_gasket_ioctl_exit(retval); + return retval; + } else if (retval == 0) { + trace_gasket_ioctl_exit(-EPERM); + return -EPERM; + } + } else if (!gasket_ioctl_check_permissions(filp, cmd)) { + trace_gasket_ioctl_exit(-EPERM); + dev_dbg(gasket_dev->dev, "ioctl cmd=%x noperm\n", cmd); + return -EPERM; + } + + /* Tracing happens in this switch statement for all ioctls with + * an integer argrument, but ioctls with a struct argument + * that needs copying and decoding, that tracing is done within + * the handler call. + */ + switch (cmd) { + case GASKET_IOCTL_RESET: + retval = gasket_reset(gasket_dev); + break; + case GASKET_IOCTL_SET_EVENTFD: + retval = gasket_set_event_fd(gasket_dev, argp); + break; + case GASKET_IOCTL_CLEAR_EVENTFD: + trace_gasket_ioctl_integer_data(arg); + retval = + gasket_interrupt_clear_eventfd(gasket_dev->interrupt_data, + (int)arg); + break; + case GASKET_IOCTL_PARTITION_PAGE_TABLE: + trace_gasket_ioctl_integer_data(arg); + retval = gasket_partition_page_table(gasket_dev, argp); + break; + case GASKET_IOCTL_NUMBER_PAGE_TABLES: + trace_gasket_ioctl_integer_data(gasket_dev->num_page_tables); + if (copy_to_user(argp, &gasket_dev->num_page_tables, + sizeof(uint64_t))) + retval = -EFAULT; + else + retval = 0; + break; + case GASKET_IOCTL_PAGE_TABLE_SIZE: + retval = gasket_read_page_table_size(gasket_dev, argp); + break; + case GASKET_IOCTL_SIMPLE_PAGE_TABLE_SIZE: + retval = gasket_read_simple_page_table_size(gasket_dev, argp); + break; + case GASKET_IOCTL_MAP_BUFFER: + retval = gasket_map_buffers(gasket_dev, argp); + break; + case GASKET_IOCTL_CONFIG_COHERENT_ALLOCATOR: + retval = gasket_config_coherent_allocator(gasket_dev, argp); + break; + case GASKET_IOCTL_UNMAP_BUFFER: + retval = gasket_unmap_buffers(gasket_dev, argp); + break; + case GASKET_IOCTL_CLEAR_INTERRUPT_COUNTS: + /* Clear interrupt counts doesn't take an arg, so use 0. */ + trace_gasket_ioctl_integer_data(0); + retval = gasket_interrupt_reset_counts(gasket_dev); + break; + default: + /* If we don't understand the ioctl, the best we can do is trace + * the arg. + */ + trace_gasket_ioctl_integer_data(arg); + dev_dbg(gasket_dev->dev, + "Unknown ioctl cmd=0x%x not caught by " + "gasket_is_supported_ioctl\n", + cmd); + retval = -EINVAL; + break; + } + + trace_gasket_ioctl_exit(retval); + return retval; +} + +/* + * Determines if an ioctl is part of the standard Gasket framework. + * @cmd: The ioctl number to handle. + * + * Returns 1 if the ioctl is supported and 0 otherwise. + */ +long gasket_is_supported_ioctl(uint cmd) +{ + switch (cmd) { + case GASKET_IOCTL_RESET: + case GASKET_IOCTL_SET_EVENTFD: + case GASKET_IOCTL_CLEAR_EVENTFD: + case GASKET_IOCTL_PARTITION_PAGE_TABLE: + case GASKET_IOCTL_NUMBER_PAGE_TABLES: + case GASKET_IOCTL_PAGE_TABLE_SIZE: + case GASKET_IOCTL_SIMPLE_PAGE_TABLE_SIZE: + case GASKET_IOCTL_MAP_BUFFER: + case GASKET_IOCTL_UNMAP_BUFFER: + case GASKET_IOCTL_CLEAR_INTERRUPT_COUNTS: + case GASKET_IOCTL_CONFIG_COHERENT_ALLOCATOR: + return 1; + default: + return 0; + } +} |