diff options
Diffstat (limited to 'drivers/staging/gasket/gasket_page_table.h')
| -rw-r--r-- | drivers/staging/gasket/gasket_page_table.h | 249 |
1 files changed, 0 insertions, 249 deletions
diff --git a/drivers/staging/gasket/gasket_page_table.h b/drivers/staging/gasket/gasket_page_table.h deleted file mode 100644 index 7b01b73ea3e7..000000000000 --- a/drivers/staging/gasket/gasket_page_table.h +++ /dev/null @@ -1,249 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -/* - * Gasket Page Table functionality. This file describes the address - * translation/paging functionality supported by the Gasket driver framework. - * As much as possible, internal details are hidden to simplify use - - * all calls are thread-safe (protected by an internal mutex) except where - * indicated otherwise. - * - * Copyright (C) 2018 Google, Inc. - */ - -#ifndef __GASKET_PAGE_TABLE_H__ -#define __GASKET_PAGE_TABLE_H__ - -#include <linux/pci.h> -#include <linux/types.h> - -#include "gasket_constants.h" -#include "gasket_core.h" - -/* - * Structure used for managing address translation on a device. All details are - * internal to the implementation. - */ -struct gasket_page_table; - -/* - * Allocate and init address translation data. - * @ppage_table: Pointer to Gasket page table pointer. Set by this call. - * @att_base_reg: [Mapped] pointer to the first entry in the device's address - * translation table. - * @extended_offset_reg: [Mapped] pointer to the device's register containing - * the starting index of the extended translation table. - * @extended_bit_location: The index of the bit indicating whether an address - * is extended. - * @total_entries: The total number of entries in the device's address - * translation table. - * @device: Device structure for the underlying device. Only used for logging. - * @pci_dev: PCI system descriptor for the underlying device. - * whether the driver will supply its own. - * - * Description: Allocates and initializes data to track address translation - - * simple and extended page table metadata. Initially, the page table is - * partitioned such that all addresses are "simple" (single-level lookup). - * gasket_partition_page_table can be called to change this paritioning. - * - * Returns 0 on success, a negative error code otherwise. - */ -int gasket_page_table_init(struct gasket_page_table **ppg_tbl, - const struct gasket_bar_data *bar_data, - const struct gasket_page_table_config *page_table_config, - struct device *device, struct pci_dev *pci_dev); - -/* - * Deallocate and cleanup page table data. - * @page_table: Gasket page table pointer. - * - * Description: The inverse of gasket_init; frees page_table and its contained - * elements. - * - * Because this call destroys the page table, it cannot be - * thread-safe (mutex-protected)! - */ -void gasket_page_table_cleanup(struct gasket_page_table *page_table); - -/* - * Sets the size of the simple page table. - * @page_table: Gasket page table pointer. - * @num_simple_entries: Desired size of the simple page table (in entries). - * - * Description: gasket_partition_page_table checks to see if the simple page - * size can be changed (i.e., if there are no active extended - * mappings in the new simple size range), and, if so, - * sets the new simple and extended page table sizes. - * - * Returns 0 if successful, or non-zero if the page table entries - * are not free. - */ -int gasket_page_table_partition(struct gasket_page_table *page_table, - uint num_simple_entries); - -/* - * Get and map [host] user space pages into device memory. - * @page_table: Gasket page table pointer. - * @host_addr: Starting host virtual memory address of the pages. - * @dev_addr: Starting device address of the pages. - * @num_pages: Number of [4kB] pages to map. - * - * Description: Maps the "num_pages" pages of host memory pointed to by - * host_addr to the address "dev_addr" in device memory. - * - * The caller is responsible for checking the addresses ranges. - * - * Returns 0 if successful or a non-zero error number otherwise. - * If there is an error, no pages are mapped. - */ -int gasket_page_table_map(struct gasket_page_table *page_table, ulong host_addr, - ulong dev_addr, uint num_pages); - -/* - * Un-map host pages from device memory. - * @page_table: Gasket page table pointer. - * @dev_addr: Starting device address of the pages to unmap. - * @num_pages: The number of [4kB] pages to unmap. - * - * Description: The inverse of gasket_map_pages. Unmaps pages from the device. - */ -void gasket_page_table_unmap(struct gasket_page_table *page_table, - ulong dev_addr, uint num_pages); - -/* - * Unmap ALL host pages from device memory. - * @page_table: Gasket page table pointer. - */ -void gasket_page_table_unmap_all(struct gasket_page_table *page_table); - -/* - * Unmap all host pages from device memory and reset the table to fully simple - * addressing. - * @page_table: Gasket page table pointer. - */ -void gasket_page_table_reset(struct gasket_page_table *page_table); - -/* - * Reclaims unused page table memory. - * @page_table: Gasket page table pointer. - * - * Description: Examines the page table and frees any currently-unused - * allocations. Called internally on gasket_cleanup(). - */ -void gasket_page_table_garbage_collect(struct gasket_page_table *page_table); - -/* - * Retrieve the backing page for a device address. - * @page_table: Gasket page table pointer. - * @dev_addr: Gasket device address. - * @ppage: Pointer to a page pointer for the returned page. - * @poffset: Pointer to an unsigned long for the returned offset. - * - * Description: Interprets the address and looks up the corresponding page - * in the page table and the offset in that page. (We need an - * offset because the host page may be larger than the Gasket chip - * page it contains.) - * - * Returns 0 if successful, -1 for an error. The page pointer - * and offset are returned through the pointers, if successful. - */ -int gasket_page_table_lookup_page(struct gasket_page_table *page_table, - ulong dev_addr, struct page **page, - ulong *poffset); - -/* - * Checks validity for input addrs and size. - * @page_table: Gasket page table pointer. - * @host_addr: Host address to check. - * @dev_addr: Gasket device address. - * @bytes: Size of the range to check (in bytes). - * - * Description: This call performs a number of checks to verify that the ranges - * specified by both addresses and the size are valid for mapping pages into - * device memory. - * - * Returns true if the mapping is bad, false otherwise. - */ -bool gasket_page_table_are_addrs_bad(struct gasket_page_table *page_table, - ulong host_addr, ulong dev_addr, - ulong bytes); - -/* - * Checks validity for input dev addr and size. - * @page_table: Gasket page table pointer. - * @dev_addr: Gasket device address. - * @bytes: Size of the range to check (in bytes). - * - * Description: This call performs a number of checks to verify that the range - * specified by the device address and the size is valid for mapping pages into - * device memory. - * - * Returns true if the address is bad, false otherwise. - */ -bool gasket_page_table_is_dev_addr_bad(struct gasket_page_table *page_table, - ulong dev_addr, ulong bytes); - -/* - * Gets maximum size for the given page table. - * @page_table: Gasket page table pointer. - */ -uint gasket_page_table_max_size(struct gasket_page_table *page_table); - -/* - * Gets the total number of entries in the arg. - * @page_table: Gasket page table pointer. - */ -uint gasket_page_table_num_entries(struct gasket_page_table *page_table); - -/* - * Gets the number of simple entries. - * @page_table: Gasket page table pointer. - */ -uint gasket_page_table_num_simple_entries(struct gasket_page_table *page_table); - -/* - * Gets the number of actively pinned pages. - * @page_table: Gasket page table pointer. - */ -uint gasket_page_table_num_active_pages(struct gasket_page_table *page_table); - -/* - * Get status of page table managed by @page_table. - * @page_table: Gasket page table pointer. - */ -int gasket_page_table_system_status(struct gasket_page_table *page_table); - -/* - * Allocate a block of coherent memory. - * @gasket_dev: Gasket Device. - * @size: Size of the memory block. - * @dma_address: Dma address allocated by the kernel. - * @index: Index of the gasket_page_table within this Gasket device - * - * Description: Allocate a contiguous coherent memory block, DMA'ble - * by this device. - */ -int gasket_alloc_coherent_memory(struct gasket_dev *gasket_dev, uint64_t size, - dma_addr_t *dma_address, uint64_t index); -/* Release a block of contiguous coherent memory, in use by a device. */ -int gasket_free_coherent_memory(struct gasket_dev *gasket_dev, uint64_t size, - dma_addr_t dma_address, uint64_t index); - -/* Release all coherent memory. */ -void gasket_free_coherent_memory_all(struct gasket_dev *gasket_dev, - uint64_t index); - -/* - * Records the host_addr to coherent dma memory mapping. - * @gasket_dev: Gasket Device. - * @size: Size of the virtual address range to map. - * @dma_address: Dma address within the coherent memory range. - * @vma: Virtual address we wish to map to coherent memory. - * - * Description: For each page in the virtual address range, record the - * coherent page mapping. - * - * Does not perform validity checking. - */ -int gasket_set_user_virt(struct gasket_dev *gasket_dev, uint64_t size, - dma_addr_t dma_address, ulong vma); - -#endif /* __GASKET_PAGE_TABLE_H__ */ |