diff options
Diffstat (limited to 'drivers/staging/gasket/gasket_core.h')
| -rw-r--r-- | drivers/staging/gasket/gasket_core.h | 638 |
1 files changed, 0 insertions, 638 deletions
diff --git a/drivers/staging/gasket/gasket_core.h b/drivers/staging/gasket/gasket_core.h deleted file mode 100644 index c417acadb0d5..000000000000 --- a/drivers/staging/gasket/gasket_core.h +++ /dev/null @@ -1,638 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -/* - * Gasket generic driver. Defines the set of data types and functions necessary - * to define a driver using the Gasket generic driver framework. - * - * Copyright (C) 2018 Google, Inc. - */ -#ifndef __GASKET_CORE_H__ -#define __GASKET_CORE_H__ - -#include <linux/cdev.h> -#include <linux/compiler.h> -#include <linux/device.h> -#include <linux/init.h> -#include <linux/module.h> -#include <linux/pci.h> -#include <linux/sched.h> -#include <linux/slab.h> - -#include "gasket_constants.h" - -/** - * struct gasket_num_name - Map numbers to names. - * @ein_num: Number. - * @ein_name: Name associated with the number, a char pointer. - * - * This structure maps numbers to names. It is used to provide printable enum - * names, e.g {0, "DEAD"} or {1, "ALIVE"}. - */ -struct gasket_num_name { - uint snn_num; - const char *snn_name; -}; - -/* - * Register location for packed interrupts. - * Each value indicates the location of an interrupt field (in units of - * gasket_driver_desc->interrupt_pack_width) within the containing register. - * In other words, this indicates the shift to use when creating a mask to - * extract/set bits within a register for a given interrupt. - */ -enum gasket_interrupt_packing { - PACK_0 = 0, - PACK_1 = 1, - PACK_2 = 2, - PACK_3 = 3, - UNPACKED = 4, -}; - -/* Type of the interrupt supported by the device. */ -enum gasket_interrupt_type { - PCI_MSIX = 0, -}; - -/* - * Used to describe a Gasket interrupt. Contains an interrupt index, a register, - * and packing data for that interrupt. The register and packing data - * fields are relevant only for PCI_MSIX interrupt type and can be - * set to 0 for everything else. - */ -struct gasket_interrupt_desc { - /* Device-wide interrupt index/number. */ - int index; - /* The register offset controlling this interrupt. */ - u64 reg; - /* The location of this interrupt inside register reg, if packed. */ - int packing; -}; - -/* - * This enum is used to identify memory regions being part of the physical - * memory that belongs to a device. - */ -enum mappable_area_type { - PCI_BAR = 0, /* Default */ - BUS_REGION, /* For SYSBUS devices, i.e. AXI etc... */ - COHERENT_MEMORY -}; - -/* - * Metadata for each BAR mapping. - * This struct is used so as to track PCI memory, I/O space, AXI and coherent - * memory area... i.e. memory objects which can be referenced in the device's - * mmap function. - */ -struct gasket_bar_data { - /* Virtual base address. */ - u8 __iomem *virt_base; - - /* Physical base address. */ - ulong phys_base; - - /* Length of the mapping. */ - ulong length_bytes; - - /* Type of mappable area */ - enum mappable_area_type type; -}; - -/* Maintains device open ownership data. */ -struct gasket_ownership { - /* 1 if the device is owned, 0 otherwise. */ - int is_owned; - - /* TGID of the owner. */ - pid_t owner; - - /* Count of current device opens in write mode. */ - int write_open_count; -}; - -/* Page table modes of operation. */ -enum gasket_page_table_mode { - /* The page table is partitionable as normal, all simple by default. */ - GASKET_PAGE_TABLE_MODE_NORMAL, - - /* All entries are always simple. */ - GASKET_PAGE_TABLE_MODE_SIMPLE, - - /* All entries are always extended. No extended bit is used. */ - GASKET_PAGE_TABLE_MODE_EXTENDED, -}; - -/* Page table configuration. One per table. */ -struct gasket_page_table_config { - /* The identifier/index of this page table. */ - int id; - - /* The operation mode of this page table. */ - enum gasket_page_table_mode mode; - - /* Total (first-level) entries in this page table. */ - ulong total_entries; - - /* Base register for the page table. */ - int base_reg; - - /* - * Register containing the extended page table. This value is unused in - * GASKET_PAGE_TABLE_MODE_SIMPLE and GASKET_PAGE_TABLE_MODE_EXTENDED - * modes. - */ - int extended_reg; - - /* The bit index indicating whether a PT entry is extended. */ - int extended_bit; -}; - -/* Maintains information about a device node. */ -struct gasket_cdev_info { - /* The internal name of this device. */ - char name[GASKET_NAME_MAX]; - - /* Device number. */ - dev_t devt; - - /* Kernel-internal device structure. */ - struct device *device; - - /* Character device for real. */ - struct cdev cdev; - - /* Flag indicating if cdev_add has been called for the devices. */ - int cdev_added; - - /* Pointer to the overall gasket_dev struct for this device. */ - struct gasket_dev *gasket_dev_ptr; - - /* Ownership data for the device in question. */ - struct gasket_ownership ownership; -}; - -/* Describes the offset and length of mmapable device BAR regions. */ -struct gasket_mappable_region { - u64 start; - u64 length_bytes; -}; - -/* Describe the offset, size, and permissions for a device bar. */ -struct gasket_bar_desc { - /* - * The size of each PCI BAR range, in bytes. If a value is 0, that BAR - * will not be mapped into kernel space at all. - * For devices with 64 bit BARs, only elements 0, 2, and 4 should be - * populated, and 1, 3, and 5 should be set to 0. - * For example, for a device mapping 1M in each of the first two 64-bit - * BARs, this field would be set as { 0x100000, 0, 0x100000, 0, 0, 0 } - * (one number per bar_desc struct.) - */ - u64 size; - /* The permissions for this bar. (Should be VM_WRITE/VM_READ/VM_EXEC, - * and can be or'd.) If set to GASKET_NOMAP, the bar will - * not be used for mmapping. - */ - ulong permissions; - /* The memory address corresponding to the base of this bar, if used. */ - u64 base; - /* The number of mappable regions in this bar. */ - int num_mappable_regions; - - /* The mappable subregions of this bar. */ - const struct gasket_mappable_region *mappable_regions; - - /* Type of mappable area */ - enum mappable_area_type type; -}; - -/* Describes the offset, size, and permissions for a coherent buffer. */ -struct gasket_coherent_buffer_desc { - /* The size of the coherent buffer. */ - u64 size; - - /* The permissions for this bar. (Should be VM_WRITE/VM_READ/VM_EXEC, - * and can be or'd.) If set to GASKET_NOMAP, the bar will - * not be used for mmaping. - */ - ulong permissions; - - /* device side address. */ - u64 base; -}; - -/* Coherent buffer structure. */ -struct gasket_coherent_buffer { - /* Virtual base address. */ - u8 *virt_base; - - /* Physical base address. */ - ulong phys_base; - - /* Length of the mapping. */ - ulong length_bytes; -}; - -/* Description of Gasket-specific permissions in the mmap field. */ -enum gasket_mapping_options { GASKET_NOMAP = 0 }; - -/* This struct represents an undefined bar that should never be mapped. */ -#define GASKET_UNUSED_BAR \ - { \ - 0, GASKET_NOMAP, 0, 0, NULL, 0 \ - } - -/* Internal data for a Gasket device. See gasket_core.c for more information. */ -struct gasket_internal_desc; - -#define MAX_NUM_COHERENT_PAGES 16 - -/* - * Device data for Gasket device instances. - * - * This structure contains the data required to manage a Gasket device. - */ -struct gasket_dev { - /* Pointer to the internal driver description for this device. */ - struct gasket_internal_desc *internal_desc; - - /* Device info */ - struct device *dev; - - /* PCI subsystem metadata. */ - struct pci_dev *pci_dev; - - /* This device's index into internal_desc->devs. */ - int dev_idx; - - /* The name of this device, as reported by the kernel. */ - char kobj_name[GASKET_NAME_MAX]; - - /* Virtual address of mapped BAR memory range. */ - struct gasket_bar_data bar_data[PCI_STD_NUM_BARS]; - - /* Coherent buffer. */ - struct gasket_coherent_buffer coherent_buffer; - - /* Number of page tables for this device. */ - int num_page_tables; - - /* Address translations. Page tables have a private implementation. */ - struct gasket_page_table *page_table[GASKET_MAX_NUM_PAGE_TABLES]; - - /* Interrupt data for this device. */ - struct gasket_interrupt_data *interrupt_data; - - /* Status for this device - GASKET_STATUS_ALIVE or _DEAD. */ - uint status; - - /* Number of times this device has been reset. */ - uint reset_count; - - /* Dev information for the cdev node. */ - struct gasket_cdev_info dev_info; - - /* Hardware revision value for this device. */ - int hardware_revision; - - /* Protects access to per-device data (i.e. this structure). */ - struct mutex mutex; - - /* cdev hash tracking/membership structure, Accel and legacy. */ - /* Unused until Accel is upstreamed. */ - struct hlist_node hlist_node; - struct hlist_node legacy_hlist_node; -}; - -/* Type of the ioctl handler callback. */ -typedef long (*gasket_ioctl_handler_cb_t)(struct file *file, uint cmd, - void __user *argp); -/* Type of the ioctl permissions check callback. See below. */ -typedef int (*gasket_ioctl_permissions_cb_t)(struct file *filp, uint cmd, - void __user *argp); - -/* - * Device type descriptor. - * - * This structure contains device-specific data needed to identify and address a - * type of device to be administered via the Gasket generic driver. - * - * Device IDs are per-driver. In other words, two drivers using the Gasket - * framework will each have a distinct device 0 (for example). - */ -struct gasket_driver_desc { - /* The name of this device type. */ - const char *name; - - /* The name of this specific device model. */ - const char *chip_model; - - /* The version of the chip specified in chip_model. */ - const char *chip_version; - - /* The version of this driver: "1.0.0", "2.1.3", etc. */ - const char *driver_version; - - /* - * Non-zero if we should create "legacy" (device and device-class- - * specific) character devices and sysfs nodes. - */ - /* Unused until Accel is upstreamed. */ - int legacy_support; - - /* Major and minor numbers identifying the device. */ - int major, minor; - - /* Module structure for this driver. */ - struct module *module; - - /* PCI ID table. */ - const struct pci_device_id *pci_id_table; - - /* The number of page tables handled by this driver. */ - int num_page_tables; - - /* The index of the bar containing the page tables. */ - int page_table_bar_index; - - /* Registers used to control each page table. */ - const struct gasket_page_table_config *page_table_configs; - - /* The bit index indicating whether a PT entry is extended. */ - int page_table_extended_bit; - - /* - * Legacy mmap address adjusment for legacy devices only. Should be 0 - * for any new device. - */ - ulong legacy_mmap_address_offset; - - /* Set of 6 bar descriptions that describe all PCIe bars. - * Note that BUS/AXI devices (i.e. non PCI devices) use those. - */ - struct gasket_bar_desc bar_descriptions[PCI_STD_NUM_BARS]; - - /* - * Coherent buffer description. - */ - struct gasket_coherent_buffer_desc coherent_buffer_description; - - /* Interrupt type. (One of gasket_interrupt_type). */ - int interrupt_type; - - /* Index of the bar containing the interrupt registers to program. */ - int interrupt_bar_index; - - /* Number of interrupts in the gasket_interrupt_desc array */ - int num_interrupts; - - /* Description of the interrupts for this device. */ - const struct gasket_interrupt_desc *interrupts; - - /* - * If this device packs multiple interrupt->MSI-X mappings into a - * single register (i.e., "uses packed interrupts"), only a single bit - * width is supported for each interrupt mapping (unpacked/"full-width" - * interrupts are always supported). This value specifies that width. If - * packed interrupts are not used, this value is ignored. - */ - int interrupt_pack_width; - - /* Driver callback functions - all may be NULL */ - /* - * device_open_cb: Callback for when a device node is opened in write - * mode. - * @dev: The gasket_dev struct for this driver instance. - * - * This callback should perform device-specific setup that needs to - * occur only once when a device is first opened. - */ - int (*device_open_cb)(struct gasket_dev *dev); - - /* - * device_release_cb: Callback when a device is closed. - * @gasket_dev: The gasket_dev struct for this driver instance. - * - * This callback is called whenever a device node fd is closed, as - * opposed to device_close_cb, which is called when the _last_ - * descriptor for an open file is closed. This call is intended to - * handle any per-user or per-fd cleanup. - */ - int (*device_release_cb)(struct gasket_dev *gasket_dev, - struct file *file); - - /* - * device_close_cb: Callback for when a device node is closed for the - * last time. - * @dev: The gasket_dev struct for this driver instance. - * - * This callback should perform device-specific cleanup that only - * needs to occur when the last reference to a device node is closed. - * - * This call is intended to handle and device-wide cleanup, as opposed - * to per-fd cleanup (which should be handled by device_release_cb). - */ - int (*device_close_cb)(struct gasket_dev *dev); - - /* - * get_mappable_regions_cb: Get descriptors of mappable device memory. - * @gasket_dev: Pointer to the struct gasket_dev for this device. - * @bar_index: BAR for which to retrieve memory ranges. - * @mappable_regions: Out-pointer to the list of mappable regions on the - * device/BAR for this process. - * @num_mappable_regions: Out-pointer for the size of mappable_regions. - * - * Called when handling mmap(), this callback is used to determine which - * regions of device memory may be mapped by the current process. This - * information is then compared to mmap request to determine which - * regions to actually map. - */ - int (*get_mappable_regions_cb)(struct gasket_dev *gasket_dev, - int bar_index, - struct gasket_mappable_region **mappable_regions, - int *num_mappable_regions); - - /* - * ioctl_permissions_cb: Check permissions for generic ioctls. - * @filp: File structure pointer describing this node usage session. - * @cmd: ioctl number to handle. - * @arg: ioctl-specific data pointer. - * - * Returns 1 if the ioctl may be executed, 0 otherwise. If this callback - * isn't specified a default routine will be used, that only allows the - * original device opener (i.e, the "owner") to execute state-affecting - * ioctls. - */ - gasket_ioctl_permissions_cb_t ioctl_permissions_cb; - - /* - * ioctl_handler_cb: Callback to handle device-specific ioctls. - * @filp: File structure pointer describing this node usage session. - * @cmd: ioctl number to handle. - * @arg: ioctl-specific data pointer. - * - * Invoked whenever an ioctl is called that the generic Gasket - * framework doesn't support. If no cb is registered, unknown ioctls - * return -EINVAL. Should return an error status (either -EINVAL or - * the error result of the ioctl being handled). - */ - gasket_ioctl_handler_cb_t ioctl_handler_cb; - - /* - * device_status_cb: Callback to determine device health. - * @dev: Pointer to the gasket_dev struct for this device. - * - * Called to determine if the device is healthy or not. Should return - * a member of the gasket_status_type enum. - * - */ - int (*device_status_cb)(struct gasket_dev *dev); - - /* - * hardware_revision_cb: Get the device's hardware revision. - * @dev: Pointer to the gasket_dev struct for this device. - * - * Called to determine the reported rev of the physical hardware. - * Revision should be >0. A negative return value is an error. - */ - int (*hardware_revision_cb)(struct gasket_dev *dev); - - /* - * device_reset_cb: Reset the hardware in question. - * @dev: Pointer to the gasket_dev structure for this device. - * - * Called by reset ioctls. This function should not - * lock the gasket_dev mutex. It should return 0 on success - * and an error on failure. - */ - int (*device_reset_cb)(struct gasket_dev *dev); -}; - -/* - * Register the specified device type with the framework. - * @desc: Populated/initialized device type descriptor. - * - * This function does _not_ take ownership of desc; the underlying struct must - * exist until the matching call to gasket_unregister_device. - * This function should be called from your driver's module_init function. - */ -int gasket_register_device(const struct gasket_driver_desc *desc); - -/* - * Remove the specified device type from the framework. - * @desc: Descriptor for the device type to unregister; it should have been - * passed to gasket_register_device in a previous call. - * - * This function should be called from your driver's module_exit function. - */ -void gasket_unregister_device(const struct gasket_driver_desc *desc); - -/* Add a PCI gasket device. */ -int gasket_pci_add_device(struct pci_dev *pci_dev, - struct gasket_dev **gasket_devp); -/* Remove a PCI gasket device. */ -void gasket_pci_remove_device(struct pci_dev *pci_dev); - -/* Enable a Gasket device. */ -int gasket_enable_device(struct gasket_dev *gasket_dev); - -/* Disable a Gasket device. */ -void gasket_disable_device(struct gasket_dev *gasket_dev); - -/* - * Reset the Gasket device. - * @gasket_dev: Gasket device struct. - * - * Calls device_reset_cb. Returns 0 on success and an error code othewrise. - * gasket_reset_nolock will not lock the mutex, gasket_reset will. - * - */ -int gasket_reset(struct gasket_dev *gasket_dev); -int gasket_reset_nolock(struct gasket_dev *gasket_dev); - -/* - * Memory management functions. These will likely be spun off into their own - * file in the future. - */ - -/* Unmaps the specified mappable region from a VMA. */ -int gasket_mm_unmap_region(const struct gasket_dev *gasket_dev, - struct vm_area_struct *vma, - const struct gasket_mappable_region *map_region); - -/* - * Get the ioctl permissions callback. - * @gasket_dev: Gasket device structure. - */ -gasket_ioctl_permissions_cb_t -gasket_get_ioctl_permissions_cb(struct gasket_dev *gasket_dev); - -/** - * Lookup a name by number in a num_name table. - * @num: Number to lookup. - * @table: Array of num_name structures, the table for the lookup. - * - */ -const char *gasket_num_name_lookup(uint num, - const struct gasket_num_name *table); - -/* Handy inlines */ -static inline ulong gasket_dev_read_64(struct gasket_dev *gasket_dev, int bar, - ulong location) -{ - return readq_relaxed(&gasket_dev->bar_data[bar].virt_base[location]); -} - -static inline void gasket_dev_write_64(struct gasket_dev *dev, u64 value, - int bar, ulong location) -{ - writeq_relaxed(value, &dev->bar_data[bar].virt_base[location]); -} - -static inline void gasket_dev_write_32(struct gasket_dev *dev, u32 value, - int bar, ulong location) -{ - writel_relaxed(value, &dev->bar_data[bar].virt_base[location]); -} - -static inline u32 gasket_dev_read_32(struct gasket_dev *dev, int bar, - ulong location) -{ - return readl_relaxed(&dev->bar_data[bar].virt_base[location]); -} - -static inline void gasket_read_modify_write_64(struct gasket_dev *dev, int bar, - ulong location, u64 value, - u64 mask_width, u64 mask_shift) -{ - u64 mask, tmp; - - tmp = gasket_dev_read_64(dev, bar, location); - mask = ((1ULL << mask_width) - 1) << mask_shift; - tmp = (tmp & ~mask) | (value << mask_shift); - gasket_dev_write_64(dev, tmp, bar, location); -} - -static inline void gasket_read_modify_write_32(struct gasket_dev *dev, int bar, - ulong location, u32 value, - u32 mask_width, u32 mask_shift) -{ - u32 mask, tmp; - - tmp = gasket_dev_read_32(dev, bar, location); - mask = ((1 << mask_width) - 1) << mask_shift; - tmp = (tmp & ~mask) | (value << mask_shift); - gasket_dev_write_32(dev, tmp, bar, location); -} - -/* Get the Gasket driver structure for a given device. */ -const struct gasket_driver_desc *gasket_get_driver_desc(struct gasket_dev *dev); - -/* Get the device structure for a given device. */ -struct device *gasket_get_device(struct gasket_dev *dev); - -/* Helper function, Asynchronous waits on a given set of bits. */ -int gasket_wait_with_reschedule(struct gasket_dev *gasket_dev, int bar, - u64 offset, u64 mask, u64 val, - uint max_retries, u64 delay_ms); - -#endif /* __GASKET_CORE_H__ */ |