14dea2d1aSSukadev Bhattiprolu /* 24dea2d1aSSukadev Bhattiprolu * Copyright 2016-17 IBM Corp. 34dea2d1aSSukadev Bhattiprolu * 44dea2d1aSSukadev Bhattiprolu * This program is free software; you can redistribute it and/or 54dea2d1aSSukadev Bhattiprolu * modify it under the terms of the GNU General Public License 64dea2d1aSSukadev Bhattiprolu * as published by the Free Software Foundation; either version 74dea2d1aSSukadev Bhattiprolu * 2 of the License, or (at your option) any later version. 84dea2d1aSSukadev Bhattiprolu */ 94dea2d1aSSukadev Bhattiprolu 10180fe15aSSukadev Bhattiprolu #define pr_fmt(fmt) "vas: " fmt 11180fe15aSSukadev Bhattiprolu 124dea2d1aSSukadev Bhattiprolu #include <linux/types.h> 134dea2d1aSSukadev Bhattiprolu #include <linux/mutex.h> 14180fe15aSSukadev Bhattiprolu #include <linux/slab.h> 15180fe15aSSukadev Bhattiprolu #include <linux/io.h> 16b25b33acSSukadev Bhattiprolu #include <linux/log2.h> 1762c4eda4SSukadev Bhattiprolu #include <linux/rcupdate.h> 1862c4eda4SSukadev Bhattiprolu #include <linux/cred.h> 194dea2d1aSSukadev Bhattiprolu 204dea2d1aSSukadev Bhattiprolu #include "vas.h" 214dea2d1aSSukadev Bhattiprolu 22180fe15aSSukadev Bhattiprolu /* 23180fe15aSSukadev Bhattiprolu * Compute the paste address region for the window @window using the 24180fe15aSSukadev Bhattiprolu * ->paste_base_addr and ->paste_win_id_shift we got from device tree. 25180fe15aSSukadev Bhattiprolu */ 26180fe15aSSukadev Bhattiprolu static void compute_paste_address(struct vas_window *window, u64 *addr, int *len) 27180fe15aSSukadev Bhattiprolu { 28180fe15aSSukadev Bhattiprolu int winid; 29180fe15aSSukadev Bhattiprolu u64 base, shift; 30180fe15aSSukadev Bhattiprolu 31180fe15aSSukadev Bhattiprolu base = window->vinst->paste_base_addr; 32180fe15aSSukadev Bhattiprolu shift = window->vinst->paste_win_id_shift; 33180fe15aSSukadev Bhattiprolu winid = window->winid; 34180fe15aSSukadev Bhattiprolu 35180fe15aSSukadev Bhattiprolu *addr = base + (winid << shift); 36180fe15aSSukadev Bhattiprolu if (len) 37180fe15aSSukadev Bhattiprolu *len = PAGE_SIZE; 38180fe15aSSukadev Bhattiprolu 39180fe15aSSukadev Bhattiprolu pr_debug("Txwin #%d: Paste addr 0x%llx\n", winid, *addr); 40180fe15aSSukadev Bhattiprolu } 41180fe15aSSukadev Bhattiprolu 42180fe15aSSukadev Bhattiprolu static inline void get_hvwc_mmio_bar(struct vas_window *window, 43180fe15aSSukadev Bhattiprolu u64 *start, int *len) 44180fe15aSSukadev Bhattiprolu { 45180fe15aSSukadev Bhattiprolu u64 pbaddr; 46180fe15aSSukadev Bhattiprolu 47180fe15aSSukadev Bhattiprolu pbaddr = window->vinst->hvwc_bar_start; 48180fe15aSSukadev Bhattiprolu *start = pbaddr + window->winid * VAS_HVWC_SIZE; 49180fe15aSSukadev Bhattiprolu *len = VAS_HVWC_SIZE; 50180fe15aSSukadev Bhattiprolu } 51180fe15aSSukadev Bhattiprolu 52180fe15aSSukadev Bhattiprolu static inline void get_uwc_mmio_bar(struct vas_window *window, 53180fe15aSSukadev Bhattiprolu u64 *start, int *len) 54180fe15aSSukadev Bhattiprolu { 55180fe15aSSukadev Bhattiprolu u64 pbaddr; 56180fe15aSSukadev Bhattiprolu 57180fe15aSSukadev Bhattiprolu pbaddr = window->vinst->uwc_bar_start; 58180fe15aSSukadev Bhattiprolu *start = pbaddr + window->winid * VAS_UWC_SIZE; 59180fe15aSSukadev Bhattiprolu *len = VAS_UWC_SIZE; 60180fe15aSSukadev Bhattiprolu } 61180fe15aSSukadev Bhattiprolu 62180fe15aSSukadev Bhattiprolu /* 63180fe15aSSukadev Bhattiprolu * Map the paste bus address of the given send window into kernel address 64180fe15aSSukadev Bhattiprolu * space. Unlike MMIO regions (map_mmio_region() below), paste region must 65180fe15aSSukadev Bhattiprolu * be mapped cache-able and is only applicable to send windows. 66180fe15aSSukadev Bhattiprolu */ 675239af67SSukadev Bhattiprolu static void *map_paste_region(struct vas_window *txwin) 68180fe15aSSukadev Bhattiprolu { 69180fe15aSSukadev Bhattiprolu int len; 70180fe15aSSukadev Bhattiprolu void *map; 71180fe15aSSukadev Bhattiprolu char *name; 72180fe15aSSukadev Bhattiprolu u64 start; 73180fe15aSSukadev Bhattiprolu 74180fe15aSSukadev Bhattiprolu name = kasprintf(GFP_KERNEL, "window-v%d-w%d", txwin->vinst->vas_id, 75180fe15aSSukadev Bhattiprolu txwin->winid); 76180fe15aSSukadev Bhattiprolu if (!name) 77180fe15aSSukadev Bhattiprolu goto free_name; 78180fe15aSSukadev Bhattiprolu 79180fe15aSSukadev Bhattiprolu txwin->paste_addr_name = name; 80180fe15aSSukadev Bhattiprolu compute_paste_address(txwin, &start, &len); 81180fe15aSSukadev Bhattiprolu 82180fe15aSSukadev Bhattiprolu if (!request_mem_region(start, len, name)) { 83180fe15aSSukadev Bhattiprolu pr_devel("%s(): request_mem_region(0x%llx, %d) failed\n", 84180fe15aSSukadev Bhattiprolu __func__, start, len); 85180fe15aSSukadev Bhattiprolu goto free_name; 86180fe15aSSukadev Bhattiprolu } 87180fe15aSSukadev Bhattiprolu 88180fe15aSSukadev Bhattiprolu map = ioremap_cache(start, len); 89180fe15aSSukadev Bhattiprolu if (!map) { 90180fe15aSSukadev Bhattiprolu pr_devel("%s(): ioremap_cache(0x%llx, %d) failed\n", __func__, 91180fe15aSSukadev Bhattiprolu start, len); 92180fe15aSSukadev Bhattiprolu goto free_name; 93180fe15aSSukadev Bhattiprolu } 94180fe15aSSukadev Bhattiprolu 95180fe15aSSukadev Bhattiprolu pr_devel("Mapped paste addr 0x%llx to kaddr 0x%p\n", start, map); 96180fe15aSSukadev Bhattiprolu return map; 97180fe15aSSukadev Bhattiprolu 98180fe15aSSukadev Bhattiprolu free_name: 99180fe15aSSukadev Bhattiprolu kfree(name); 100180fe15aSSukadev Bhattiprolu return ERR_PTR(-ENOMEM); 101180fe15aSSukadev Bhattiprolu } 102180fe15aSSukadev Bhattiprolu 103180fe15aSSukadev Bhattiprolu static void *map_mmio_region(char *name, u64 start, int len) 104180fe15aSSukadev Bhattiprolu { 105180fe15aSSukadev Bhattiprolu void *map; 106180fe15aSSukadev Bhattiprolu 107180fe15aSSukadev Bhattiprolu if (!request_mem_region(start, len, name)) { 108180fe15aSSukadev Bhattiprolu pr_devel("%s(): request_mem_region(0x%llx, %d) failed\n", 109180fe15aSSukadev Bhattiprolu __func__, start, len); 110180fe15aSSukadev Bhattiprolu return NULL; 111180fe15aSSukadev Bhattiprolu } 112180fe15aSSukadev Bhattiprolu 113180fe15aSSukadev Bhattiprolu map = ioremap(start, len); 114180fe15aSSukadev Bhattiprolu if (!map) { 115180fe15aSSukadev Bhattiprolu pr_devel("%s(): ioremap(0x%llx, %d) failed\n", __func__, start, 116180fe15aSSukadev Bhattiprolu len); 117180fe15aSSukadev Bhattiprolu return NULL; 118180fe15aSSukadev Bhattiprolu } 119180fe15aSSukadev Bhattiprolu 120180fe15aSSukadev Bhattiprolu return map; 121180fe15aSSukadev Bhattiprolu } 122180fe15aSSukadev Bhattiprolu 123180fe15aSSukadev Bhattiprolu static void unmap_region(void *addr, u64 start, int len) 124180fe15aSSukadev Bhattiprolu { 125180fe15aSSukadev Bhattiprolu iounmap(addr); 126180fe15aSSukadev Bhattiprolu release_mem_region((phys_addr_t)start, len); 127180fe15aSSukadev Bhattiprolu } 128180fe15aSSukadev Bhattiprolu 129180fe15aSSukadev Bhattiprolu /* 130180fe15aSSukadev Bhattiprolu * Unmap the paste address region for a window. 131180fe15aSSukadev Bhattiprolu */ 13298271d41SSukadev Bhattiprolu static void unmap_paste_region(struct vas_window *window) 133180fe15aSSukadev Bhattiprolu { 134180fe15aSSukadev Bhattiprolu int len; 135180fe15aSSukadev Bhattiprolu u64 busaddr_start; 136180fe15aSSukadev Bhattiprolu 137180fe15aSSukadev Bhattiprolu if (window->paste_kaddr) { 138180fe15aSSukadev Bhattiprolu compute_paste_address(window, &busaddr_start, &len); 139180fe15aSSukadev Bhattiprolu unmap_region(window->paste_kaddr, busaddr_start, len); 140180fe15aSSukadev Bhattiprolu window->paste_kaddr = NULL; 141180fe15aSSukadev Bhattiprolu kfree(window->paste_addr_name); 142180fe15aSSukadev Bhattiprolu window->paste_addr_name = NULL; 143180fe15aSSukadev Bhattiprolu } 144180fe15aSSukadev Bhattiprolu } 145180fe15aSSukadev Bhattiprolu 146180fe15aSSukadev Bhattiprolu /* 147180fe15aSSukadev Bhattiprolu * Unmap the MMIO regions for a window. 148180fe15aSSukadev Bhattiprolu */ 149180fe15aSSukadev Bhattiprolu static void unmap_winctx_mmio_bars(struct vas_window *window) 150180fe15aSSukadev Bhattiprolu { 151180fe15aSSukadev Bhattiprolu int len; 152180fe15aSSukadev Bhattiprolu u64 busaddr_start; 153180fe15aSSukadev Bhattiprolu 154180fe15aSSukadev Bhattiprolu if (window->hvwc_map) { 155180fe15aSSukadev Bhattiprolu get_hvwc_mmio_bar(window, &busaddr_start, &len); 156180fe15aSSukadev Bhattiprolu unmap_region(window->hvwc_map, busaddr_start, len); 157180fe15aSSukadev Bhattiprolu window->hvwc_map = NULL; 158180fe15aSSukadev Bhattiprolu } 159180fe15aSSukadev Bhattiprolu 160180fe15aSSukadev Bhattiprolu if (window->uwc_map) { 161180fe15aSSukadev Bhattiprolu get_uwc_mmio_bar(window, &busaddr_start, &len); 162180fe15aSSukadev Bhattiprolu unmap_region(window->uwc_map, busaddr_start, len); 163180fe15aSSukadev Bhattiprolu window->uwc_map = NULL; 164180fe15aSSukadev Bhattiprolu } 165180fe15aSSukadev Bhattiprolu } 166180fe15aSSukadev Bhattiprolu 167180fe15aSSukadev Bhattiprolu /* 168180fe15aSSukadev Bhattiprolu * Find the Hypervisor Window Context (HVWC) MMIO Base Address Region and the 169180fe15aSSukadev Bhattiprolu * OS/User Window Context (UWC) MMIO Base Address Region for the given window. 170180fe15aSSukadev Bhattiprolu * Map these bus addresses and save the mapped kernel addresses in @window. 171180fe15aSSukadev Bhattiprolu */ 172180fe15aSSukadev Bhattiprolu int map_winctx_mmio_bars(struct vas_window *window) 173180fe15aSSukadev Bhattiprolu { 174180fe15aSSukadev Bhattiprolu int len; 175180fe15aSSukadev Bhattiprolu u64 start; 176180fe15aSSukadev Bhattiprolu 177180fe15aSSukadev Bhattiprolu get_hvwc_mmio_bar(window, &start, &len); 178180fe15aSSukadev Bhattiprolu window->hvwc_map = map_mmio_region("HVWCM_Window", start, len); 179180fe15aSSukadev Bhattiprolu 180180fe15aSSukadev Bhattiprolu get_uwc_mmio_bar(window, &start, &len); 181180fe15aSSukadev Bhattiprolu window->uwc_map = map_mmio_region("UWCM_Window", start, len); 182180fe15aSSukadev Bhattiprolu 183180fe15aSSukadev Bhattiprolu if (!window->hvwc_map || !window->uwc_map) { 184180fe15aSSukadev Bhattiprolu unmap_winctx_mmio_bars(window); 185180fe15aSSukadev Bhattiprolu return -1; 186180fe15aSSukadev Bhattiprolu } 187180fe15aSSukadev Bhattiprolu 188180fe15aSSukadev Bhattiprolu return 0; 189180fe15aSSukadev Bhattiprolu } 190180fe15aSSukadev Bhattiprolu 191b25b33acSSukadev Bhattiprolu /* 192b25b33acSSukadev Bhattiprolu * Reset all valid registers in the HV and OS/User Window Contexts for 193b25b33acSSukadev Bhattiprolu * the window identified by @window. 194b25b33acSSukadev Bhattiprolu * 195b25b33acSSukadev Bhattiprolu * NOTE: We cannot really use a for loop to reset window context. Not all 196b25b33acSSukadev Bhattiprolu * offsets in a window context are valid registers and the valid 197b25b33acSSukadev Bhattiprolu * registers are not sequential. And, we can only write to offsets 198b25b33acSSukadev Bhattiprolu * with valid registers. 199b25b33acSSukadev Bhattiprolu */ 200b25b33acSSukadev Bhattiprolu void reset_window_regs(struct vas_window *window) 201b25b33acSSukadev Bhattiprolu { 202b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LPID), 0ULL); 203b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(PID), 0ULL); 204b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(XLATE_MSR), 0ULL); 205b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(XLATE_LPCR), 0ULL); 206b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(XLATE_CTL), 0ULL); 207b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(AMR), 0ULL); 208b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(SEIDR), 0ULL); 209b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(FAULT_TX_WIN), 0ULL); 210b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(OSU_INTR_SRC_RA), 0ULL); 211b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(HV_INTR_SRC_RA), 0ULL); 212b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(PSWID), 0ULL); 213b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LFIFO_BAR), 0ULL); 214b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LDATA_STAMP_CTL), 0ULL); 215b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LDMA_CACHE_CTL), 0ULL); 216b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LRFIFO_PUSH), 0ULL); 217b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(CURR_MSG_COUNT), 0ULL); 218b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_AFTER_COUNT), 0ULL); 219b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LRX_WCRED), 0ULL); 220b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LRX_WCRED_ADDER), 0ULL); 221b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(TX_WCRED), 0ULL); 222b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(TX_WCRED_ADDER), 0ULL); 223b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LFIFO_SIZE), 0ULL); 224b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(WINCTL), 0ULL); 225b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(WIN_STATUS), 0ULL); 226b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(WIN_CTX_CACHING_CTL), 0ULL); 227b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(TX_RSVD_BUF_COUNT), 0ULL); 228b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LRFIFO_WIN_PTR), 0ULL); 229b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_CTL), 0ULL); 230b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_PID), 0ULL); 231b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_LPID), 0ULL); 232b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_TID), 0ULL); 233b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_SCOPE), 0ULL); 234b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(NX_UTIL_ADDER), 0ULL); 235b25b33acSSukadev Bhattiprolu 236b25b33acSSukadev Bhattiprolu /* Skip read-only registers: NX_UTIL and NX_UTIL_SE */ 237b25b33acSSukadev Bhattiprolu 238b25b33acSSukadev Bhattiprolu /* 239b25b33acSSukadev Bhattiprolu * The send and receive window credit adder registers are also 240b25b33acSSukadev Bhattiprolu * accessible from HVWC and have been initialized above. We don't 241b25b33acSSukadev Bhattiprolu * need to initialize from the OS/User Window Context, so skip 242b25b33acSSukadev Bhattiprolu * following calls: 243b25b33acSSukadev Bhattiprolu * 244b25b33acSSukadev Bhattiprolu * write_uwc_reg(window, VREG(TX_WCRED_ADDER), 0ULL); 245b25b33acSSukadev Bhattiprolu * write_uwc_reg(window, VREG(LRX_WCRED_ADDER), 0ULL); 246b25b33acSSukadev Bhattiprolu */ 247b25b33acSSukadev Bhattiprolu } 248b25b33acSSukadev Bhattiprolu 249b25b33acSSukadev Bhattiprolu /* 250b25b33acSSukadev Bhattiprolu * Initialize window context registers related to Address Translation. 251b25b33acSSukadev Bhattiprolu * These registers are common to send/receive windows although they 252b25b33acSSukadev Bhattiprolu * differ for user/kernel windows. As we resolve the TODOs we may 253b25b33acSSukadev Bhattiprolu * want to add fields to vas_winctx and move the initialization to 254b25b33acSSukadev Bhattiprolu * init_vas_winctx_regs(). 255b25b33acSSukadev Bhattiprolu */ 256b25b33acSSukadev Bhattiprolu static void init_xlate_regs(struct vas_window *window, bool user_win) 257b25b33acSSukadev Bhattiprolu { 258b25b33acSSukadev Bhattiprolu u64 lpcr, val; 259b25b33acSSukadev Bhattiprolu 260b25b33acSSukadev Bhattiprolu /* 261b25b33acSSukadev Bhattiprolu * MSR_TA, MSR_US are false for both kernel and user. 262b25b33acSSukadev Bhattiprolu * MSR_DR and MSR_PR are false for kernel. 263b25b33acSSukadev Bhattiprolu */ 264b25b33acSSukadev Bhattiprolu val = 0ULL; 265b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_XLATE_MSR_HV, val, 1); 266b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_XLATE_MSR_SF, val, 1); 267b25b33acSSukadev Bhattiprolu if (user_win) { 268b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_XLATE_MSR_DR, val, 1); 269b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_XLATE_MSR_PR, val, 1); 270b25b33acSSukadev Bhattiprolu } 271b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(XLATE_MSR), val); 272b25b33acSSukadev Bhattiprolu 273b25b33acSSukadev Bhattiprolu lpcr = mfspr(SPRN_LPCR); 274b25b33acSSukadev Bhattiprolu val = 0ULL; 275b25b33acSSukadev Bhattiprolu /* 276b25b33acSSukadev Bhattiprolu * NOTE: From Section 5.7.8.1 Segment Lookaside Buffer of the 277b25b33acSSukadev Bhattiprolu * Power ISA, v3.0B, Page size encoding is 0 = 4KB, 5 = 64KB. 278b25b33acSSukadev Bhattiprolu * 279b25b33acSSukadev Bhattiprolu * NOTE: From Section 1.3.1, Address Translation Context of the 280b25b33acSSukadev Bhattiprolu * Nest MMU Workbook, LPCR_SC should be 0 for Power9. 281b25b33acSSukadev Bhattiprolu */ 282b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_XLATE_LPCR_PAGE_SIZE, val, 5); 283b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_XLATE_LPCR_ISL, val, lpcr & LPCR_ISL); 284b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_XLATE_LPCR_TC, val, lpcr & LPCR_TC); 285b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_XLATE_LPCR_SC, val, 0); 286b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(XLATE_LPCR), val); 287b25b33acSSukadev Bhattiprolu 288b25b33acSSukadev Bhattiprolu /* 289b25b33acSSukadev Bhattiprolu * Section 1.3.1 (Address translation Context) of NMMU workbook. 290b25b33acSSukadev Bhattiprolu * 0b00 Hashed Page Table mode 291b25b33acSSukadev Bhattiprolu * 0b01 Reserved 292b25b33acSSukadev Bhattiprolu * 0b10 Radix on HPT 293b25b33acSSukadev Bhattiprolu * 0b11 Radix on Radix 294b25b33acSSukadev Bhattiprolu */ 295b25b33acSSukadev Bhattiprolu val = 0ULL; 296b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_XLATE_MODE, val, radix_enabled() ? 3 : 2); 297b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(XLATE_CTL), val); 298b25b33acSSukadev Bhattiprolu 299b25b33acSSukadev Bhattiprolu /* 300b25b33acSSukadev Bhattiprolu * TODO: Can we mfspr(AMR) even for user windows? 301b25b33acSSukadev Bhattiprolu */ 302b25b33acSSukadev Bhattiprolu val = 0ULL; 303b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_AMR, val, mfspr(SPRN_AMR)); 304b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(AMR), val); 305b25b33acSSukadev Bhattiprolu 306b25b33acSSukadev Bhattiprolu val = 0ULL; 307b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_SEIDR, val, 0); 308b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(SEIDR), val); 309b25b33acSSukadev Bhattiprolu } 310b25b33acSSukadev Bhattiprolu 311b25b33acSSukadev Bhattiprolu /* 312b25b33acSSukadev Bhattiprolu * Initialize Reserved Send Buffer Count for the send window. It involves 313b25b33acSSukadev Bhattiprolu * writing to the register, reading it back to confirm that the hardware 314b25b33acSSukadev Bhattiprolu * has enough buffers to reserve. See section 1.3.1.2.1 of VAS workbook. 315b25b33acSSukadev Bhattiprolu * 316b25b33acSSukadev Bhattiprolu * Since we can only make a best-effort attempt to fulfill the request, 317b25b33acSSukadev Bhattiprolu * we don't return any errors if we cannot. 318b25b33acSSukadev Bhattiprolu * 319b25b33acSSukadev Bhattiprolu * TODO: Reserved (aka dedicated) send buffers are not supported yet. 320b25b33acSSukadev Bhattiprolu */ 321b25b33acSSukadev Bhattiprolu static void init_rsvd_tx_buf_count(struct vas_window *txwin, 322b25b33acSSukadev Bhattiprolu struct vas_winctx *winctx) 323b25b33acSSukadev Bhattiprolu { 324b25b33acSSukadev Bhattiprolu write_hvwc_reg(txwin, VREG(TX_RSVD_BUF_COUNT), 0ULL); 325b25b33acSSukadev Bhattiprolu } 326b25b33acSSukadev Bhattiprolu 327b25b33acSSukadev Bhattiprolu /* 328b25b33acSSukadev Bhattiprolu * init_winctx_regs() 329b25b33acSSukadev Bhattiprolu * Initialize window context registers for a receive window. 330b25b33acSSukadev Bhattiprolu * Except for caching control and marking window open, the registers 331b25b33acSSukadev Bhattiprolu * are initialized in the order listed in Section 3.1.4 (Window Context 332b25b33acSSukadev Bhattiprolu * Cache Register Details) of the VAS workbook although they don't need 333b25b33acSSukadev Bhattiprolu * to be. 334b25b33acSSukadev Bhattiprolu * 335b25b33acSSukadev Bhattiprolu * Design note: For NX receive windows, NX allocates the FIFO buffer in OPAL 336b25b33acSSukadev Bhattiprolu * (so that it can get a large contiguous area) and passes that buffer 337b25b33acSSukadev Bhattiprolu * to kernel via device tree. We now write that buffer address to the 338b25b33acSSukadev Bhattiprolu * FIFO BAR. Would it make sense to do this all in OPAL? i.e have OPAL 339b25b33acSSukadev Bhattiprolu * write the per-chip RX FIFO addresses to the windows during boot-up 340b25b33acSSukadev Bhattiprolu * as a one-time task? That could work for NX but what about other 341b25b33acSSukadev Bhattiprolu * receivers? Let the receivers tell us the rx-fifo buffers for now. 342b25b33acSSukadev Bhattiprolu */ 343b25b33acSSukadev Bhattiprolu int init_winctx_regs(struct vas_window *window, struct vas_winctx *winctx) 344b25b33acSSukadev Bhattiprolu { 345b25b33acSSukadev Bhattiprolu u64 val; 346b25b33acSSukadev Bhattiprolu int fifo_size; 347b25b33acSSukadev Bhattiprolu 348b25b33acSSukadev Bhattiprolu reset_window_regs(window); 349b25b33acSSukadev Bhattiprolu 350b25b33acSSukadev Bhattiprolu val = 0ULL; 351b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LPID, val, winctx->lpid); 352b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LPID), val); 353b25b33acSSukadev Bhattiprolu 354b25b33acSSukadev Bhattiprolu val = 0ULL; 355b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_PID_ID, val, winctx->pidr); 356b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(PID), val); 357b25b33acSSukadev Bhattiprolu 358b25b33acSSukadev Bhattiprolu init_xlate_regs(window, winctx->user_win); 359b25b33acSSukadev Bhattiprolu 360b25b33acSSukadev Bhattiprolu val = 0ULL; 361b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_FAULT_TX_WIN, val, 0); 362b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(FAULT_TX_WIN), val); 363b25b33acSSukadev Bhattiprolu 364b25b33acSSukadev Bhattiprolu /* In PowerNV, interrupts go to HV. */ 365b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(OSU_INTR_SRC_RA), 0ULL); 366b25b33acSSukadev Bhattiprolu 367b25b33acSSukadev Bhattiprolu val = 0ULL; 368b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_HV_INTR_SRC_RA, val, winctx->irq_port); 369b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(HV_INTR_SRC_RA), val); 370b25b33acSSukadev Bhattiprolu 371b25b33acSSukadev Bhattiprolu val = 0ULL; 372b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_PSWID_EA_HANDLE, val, winctx->pswid); 373b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(PSWID), val); 374b25b33acSSukadev Bhattiprolu 375b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(SPARE1), 0ULL); 376b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(SPARE2), 0ULL); 377b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(SPARE3), 0ULL); 378b25b33acSSukadev Bhattiprolu 379b25b33acSSukadev Bhattiprolu /* 380b25b33acSSukadev Bhattiprolu * NOTE: VAS expects the FIFO address to be copied into the LFIFO_BAR 381b25b33acSSukadev Bhattiprolu * register as is - do NOT shift the address into VAS_LFIFO_BAR 382b25b33acSSukadev Bhattiprolu * bit fields! Ok to set the page migration select fields - 383b25b33acSSukadev Bhattiprolu * VAS ignores the lower 10+ bits in the address anyway, because 384b25b33acSSukadev Bhattiprolu * the minimum FIFO size is 1K? 385b25b33acSSukadev Bhattiprolu * 386b25b33acSSukadev Bhattiprolu * See also: Design note in function header. 387b25b33acSSukadev Bhattiprolu */ 388b25b33acSSukadev Bhattiprolu val = __pa(winctx->rx_fifo); 389b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_PAGE_MIGRATION_SELECT, val, 0); 390b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LFIFO_BAR), val); 391b25b33acSSukadev Bhattiprolu 392b25b33acSSukadev Bhattiprolu val = 0ULL; 393b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LDATA_STAMP, val, winctx->data_stamp); 394b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LDATA_STAMP_CTL), val); 395b25b33acSSukadev Bhattiprolu 396b25b33acSSukadev Bhattiprolu val = 0ULL; 397b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LDMA_TYPE, val, winctx->dma_type); 398b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LDMA_FIFO_DISABLE, val, winctx->fifo_disable); 399b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LDMA_CACHE_CTL), val); 400b25b33acSSukadev Bhattiprolu 401b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LRFIFO_PUSH), 0ULL); 402b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(CURR_MSG_COUNT), 0ULL); 403b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_AFTER_COUNT), 0ULL); 404b25b33acSSukadev Bhattiprolu 405b25b33acSSukadev Bhattiprolu val = 0ULL; 406b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LRX_WCRED, val, winctx->wcreds_max); 407b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LRX_WCRED), val); 408b25b33acSSukadev Bhattiprolu 409b25b33acSSukadev Bhattiprolu val = 0ULL; 410b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_TX_WCRED, val, winctx->wcreds_max); 411b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(TX_WCRED), val); 412b25b33acSSukadev Bhattiprolu 413b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LRX_WCRED_ADDER), 0ULL); 414b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(TX_WCRED_ADDER), 0ULL); 415b25b33acSSukadev Bhattiprolu 416b25b33acSSukadev Bhattiprolu fifo_size = winctx->rx_fifo_size / 1024; 417b25b33acSSukadev Bhattiprolu 418b25b33acSSukadev Bhattiprolu val = 0ULL; 419b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LFIFO_SIZE, val, ilog2(fifo_size)); 420b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LFIFO_SIZE), val); 421b25b33acSSukadev Bhattiprolu 422b25b33acSSukadev Bhattiprolu /* Update window control and caching control registers last so 423b25b33acSSukadev Bhattiprolu * we mark the window open only after fully initializing it and 424b25b33acSSukadev Bhattiprolu * pushing context to cache. 425b25b33acSSukadev Bhattiprolu */ 426b25b33acSSukadev Bhattiprolu 427b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(WIN_STATUS), 0ULL); 428b25b33acSSukadev Bhattiprolu 429b25b33acSSukadev Bhattiprolu init_rsvd_tx_buf_count(window, winctx); 430b25b33acSSukadev Bhattiprolu 431b25b33acSSukadev Bhattiprolu /* for a send window, point to the matching receive window */ 432b25b33acSSukadev Bhattiprolu val = 0ULL; 433b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LRX_WIN_ID, val, winctx->rx_win_id); 434b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LRFIFO_WIN_PTR), val); 435b25b33acSSukadev Bhattiprolu 436b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(SPARE4), 0ULL); 437b25b33acSSukadev Bhattiprolu 438b25b33acSSukadev Bhattiprolu val = 0ULL; 439b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_NOTIFY_DISABLE, val, winctx->notify_disable); 440b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_INTR_DISABLE, val, winctx->intr_disable); 441b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_NOTIFY_EARLY, val, winctx->notify_early); 442b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_NOTIFY_OSU_INTR, val, winctx->notify_os_intr_reg); 443b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_CTL), val); 444b25b33acSSukadev Bhattiprolu 445b25b33acSSukadev Bhattiprolu val = 0ULL; 446b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LNOTIFY_PID, val, winctx->lnotify_pid); 447b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_PID), val); 448b25b33acSSukadev Bhattiprolu 449b25b33acSSukadev Bhattiprolu val = 0ULL; 450b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LNOTIFY_LPID, val, winctx->lnotify_lpid); 451b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_LPID), val); 452b25b33acSSukadev Bhattiprolu 453b25b33acSSukadev Bhattiprolu val = 0ULL; 454b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LNOTIFY_TID, val, winctx->lnotify_tid); 455b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_TID), val); 456b25b33acSSukadev Bhattiprolu 457b25b33acSSukadev Bhattiprolu val = 0ULL; 458b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LNOTIFY_MIN_SCOPE, val, winctx->min_scope); 459b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LNOTIFY_MAX_SCOPE, val, winctx->max_scope); 460b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_SCOPE), val); 461b25b33acSSukadev Bhattiprolu 462b25b33acSSukadev Bhattiprolu /* Skip read-only registers NX_UTIL and NX_UTIL_SE */ 463b25b33acSSukadev Bhattiprolu 464b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(SPARE5), 0ULL); 465b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(NX_UTIL_ADDER), 0ULL); 466b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(SPARE6), 0ULL); 467b25b33acSSukadev Bhattiprolu 468b25b33acSSukadev Bhattiprolu /* Finally, push window context to memory and... */ 469b25b33acSSukadev Bhattiprolu val = 0ULL; 470b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_PUSH_TO_MEM, val, 1); 471b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(WIN_CTX_CACHING_CTL), val); 472b25b33acSSukadev Bhattiprolu 473b25b33acSSukadev Bhattiprolu /* ... mark the window open for business */ 474b25b33acSSukadev Bhattiprolu val = 0ULL; 475b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_REJ_NO_CREDIT, val, winctx->rej_no_credit); 476b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_PIN, val, winctx->pin_win); 477b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_TX_WCRED_MODE, val, winctx->tx_wcred_mode); 478b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_RX_WCRED_MODE, val, winctx->rx_wcred_mode); 479b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_TX_WORD_MODE, val, winctx->tx_word_mode); 480b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_RX_WORD_MODE, val, winctx->rx_word_mode); 481b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_FAULT_WIN, val, winctx->fault_win); 482b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_NX_WIN, val, winctx->nx_win); 483b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_OPEN, val, 1); 484b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(WINCTL), val); 485b25b33acSSukadev Bhattiprolu 486b25b33acSSukadev Bhattiprolu return 0; 487b25b33acSSukadev Bhattiprolu } 488b25b33acSSukadev Bhattiprolu 489bbfe59f8SSukadev Bhattiprolu static DEFINE_SPINLOCK(vas_ida_lock); 490bbfe59f8SSukadev Bhattiprolu 491bbfe59f8SSukadev Bhattiprolu static void vas_release_window_id(struct ida *ida, int winid) 492bbfe59f8SSukadev Bhattiprolu { 493bbfe59f8SSukadev Bhattiprolu spin_lock(&vas_ida_lock); 494bbfe59f8SSukadev Bhattiprolu ida_remove(ida, winid); 495bbfe59f8SSukadev Bhattiprolu spin_unlock(&vas_ida_lock); 496bbfe59f8SSukadev Bhattiprolu } 497bbfe59f8SSukadev Bhattiprolu 498bbfe59f8SSukadev Bhattiprolu static int vas_assign_window_id(struct ida *ida) 499bbfe59f8SSukadev Bhattiprolu { 500bbfe59f8SSukadev Bhattiprolu int rc, winid; 501bbfe59f8SSukadev Bhattiprolu 502bbfe59f8SSukadev Bhattiprolu do { 503bbfe59f8SSukadev Bhattiprolu rc = ida_pre_get(ida, GFP_KERNEL); 504bbfe59f8SSukadev Bhattiprolu if (!rc) 505bbfe59f8SSukadev Bhattiprolu return -EAGAIN; 506bbfe59f8SSukadev Bhattiprolu 507bbfe59f8SSukadev Bhattiprolu spin_lock(&vas_ida_lock); 508bbfe59f8SSukadev Bhattiprolu rc = ida_get_new(ida, &winid); 509bbfe59f8SSukadev Bhattiprolu spin_unlock(&vas_ida_lock); 510bbfe59f8SSukadev Bhattiprolu } while (rc == -EAGAIN); 511bbfe59f8SSukadev Bhattiprolu 512bbfe59f8SSukadev Bhattiprolu if (rc) 513bbfe59f8SSukadev Bhattiprolu return rc; 514bbfe59f8SSukadev Bhattiprolu 515bbfe59f8SSukadev Bhattiprolu if (winid > VAS_WINDOWS_PER_CHIP) { 516bbfe59f8SSukadev Bhattiprolu pr_err("Too many (%d) open windows\n", winid); 517bbfe59f8SSukadev Bhattiprolu vas_release_window_id(ida, winid); 518bbfe59f8SSukadev Bhattiprolu return -EAGAIN; 519bbfe59f8SSukadev Bhattiprolu } 520bbfe59f8SSukadev Bhattiprolu 521bbfe59f8SSukadev Bhattiprolu return winid; 522bbfe59f8SSukadev Bhattiprolu } 523bbfe59f8SSukadev Bhattiprolu 52498271d41SSukadev Bhattiprolu static void vas_window_free(struct vas_window *window) 525bbfe59f8SSukadev Bhattiprolu { 526bbfe59f8SSukadev Bhattiprolu int winid = window->winid; 527bbfe59f8SSukadev Bhattiprolu struct vas_instance *vinst = window->vinst; 528bbfe59f8SSukadev Bhattiprolu 529bbfe59f8SSukadev Bhattiprolu unmap_winctx_mmio_bars(window); 530bbfe59f8SSukadev Bhattiprolu kfree(window); 531bbfe59f8SSukadev Bhattiprolu 532bbfe59f8SSukadev Bhattiprolu vas_release_window_id(&vinst->ida, winid); 533bbfe59f8SSukadev Bhattiprolu } 534bbfe59f8SSukadev Bhattiprolu 53562c4eda4SSukadev Bhattiprolu static struct vas_window *vas_window_alloc(struct vas_instance *vinst) 536bbfe59f8SSukadev Bhattiprolu { 537bbfe59f8SSukadev Bhattiprolu int winid; 538bbfe59f8SSukadev Bhattiprolu struct vas_window *window; 539bbfe59f8SSukadev Bhattiprolu 540bbfe59f8SSukadev Bhattiprolu winid = vas_assign_window_id(&vinst->ida); 541bbfe59f8SSukadev Bhattiprolu if (winid < 0) 542bbfe59f8SSukadev Bhattiprolu return ERR_PTR(winid); 543bbfe59f8SSukadev Bhattiprolu 544bbfe59f8SSukadev Bhattiprolu window = kzalloc(sizeof(*window), GFP_KERNEL); 545bbfe59f8SSukadev Bhattiprolu if (!window) 546bbfe59f8SSukadev Bhattiprolu goto out_free; 547bbfe59f8SSukadev Bhattiprolu 548bbfe59f8SSukadev Bhattiprolu window->vinst = vinst; 549bbfe59f8SSukadev Bhattiprolu window->winid = winid; 550bbfe59f8SSukadev Bhattiprolu 551bbfe59f8SSukadev Bhattiprolu if (map_winctx_mmio_bars(window)) 552bbfe59f8SSukadev Bhattiprolu goto out_free; 553bbfe59f8SSukadev Bhattiprolu 554bbfe59f8SSukadev Bhattiprolu return window; 555bbfe59f8SSukadev Bhattiprolu 556bbfe59f8SSukadev Bhattiprolu out_free: 557bbfe59f8SSukadev Bhattiprolu kfree(window); 558bbfe59f8SSukadev Bhattiprolu vas_release_window_id(&vinst->ida, winid); 559bbfe59f8SSukadev Bhattiprolu return ERR_PTR(-ENOMEM); 560bbfe59f8SSukadev Bhattiprolu } 561bbfe59f8SSukadev Bhattiprolu 56298271d41SSukadev Bhattiprolu static void put_rx_win(struct vas_window *rxwin) 56398271d41SSukadev Bhattiprolu { 56498271d41SSukadev Bhattiprolu /* Better not be a send window! */ 56598271d41SSukadev Bhattiprolu WARN_ON_ONCE(rxwin->tx_win); 56698271d41SSukadev Bhattiprolu 56798271d41SSukadev Bhattiprolu atomic_dec(&rxwin->num_txwins); 56898271d41SSukadev Bhattiprolu } 56998271d41SSukadev Bhattiprolu 57062c4eda4SSukadev Bhattiprolu /* 57162c4eda4SSukadev Bhattiprolu * Get the VAS receive window associated with NX engine identified 57262c4eda4SSukadev Bhattiprolu * by @cop and if applicable, @pswid. 57362c4eda4SSukadev Bhattiprolu * 57462c4eda4SSukadev Bhattiprolu * See also function header of set_vinst_win(). 57562c4eda4SSukadev Bhattiprolu */ 5765239af67SSukadev Bhattiprolu static struct vas_window *get_vinst_rxwin(struct vas_instance *vinst, 57762c4eda4SSukadev Bhattiprolu enum vas_cop_type cop, u32 pswid) 57862c4eda4SSukadev Bhattiprolu { 57962c4eda4SSukadev Bhattiprolu struct vas_window *rxwin; 58062c4eda4SSukadev Bhattiprolu 58162c4eda4SSukadev Bhattiprolu mutex_lock(&vinst->mutex); 58262c4eda4SSukadev Bhattiprolu 58362c4eda4SSukadev Bhattiprolu if (cop == VAS_COP_TYPE_842 || cop == VAS_COP_TYPE_842_HIPRI) 58462c4eda4SSukadev Bhattiprolu rxwin = vinst->rxwin[cop] ?: ERR_PTR(-EINVAL); 58562c4eda4SSukadev Bhattiprolu else 58662c4eda4SSukadev Bhattiprolu rxwin = ERR_PTR(-EINVAL); 58762c4eda4SSukadev Bhattiprolu 58862c4eda4SSukadev Bhattiprolu if (!IS_ERR(rxwin)) 58962c4eda4SSukadev Bhattiprolu atomic_inc(&rxwin->num_txwins); 59062c4eda4SSukadev Bhattiprolu 59162c4eda4SSukadev Bhattiprolu mutex_unlock(&vinst->mutex); 59262c4eda4SSukadev Bhattiprolu 59362c4eda4SSukadev Bhattiprolu return rxwin; 59462c4eda4SSukadev Bhattiprolu } 59562c4eda4SSukadev Bhattiprolu 59662c4eda4SSukadev Bhattiprolu /* 59762c4eda4SSukadev Bhattiprolu * We have two tables of windows in a VAS instance. The first one, 59862c4eda4SSukadev Bhattiprolu * ->windows[], contains all the windows in the instance and allows 59962c4eda4SSukadev Bhattiprolu * looking up a window by its id. It is used to look up send windows 60062c4eda4SSukadev Bhattiprolu * during fault handling and receive windows when pairing user space 60162c4eda4SSukadev Bhattiprolu * send/receive windows. 60262c4eda4SSukadev Bhattiprolu * 60362c4eda4SSukadev Bhattiprolu * The second table, ->rxwin[], contains receive windows that are 60462c4eda4SSukadev Bhattiprolu * associated with NX engines. This table has VAS_COP_TYPE_MAX 60562c4eda4SSukadev Bhattiprolu * entries and is used to look up a receive window by its 60662c4eda4SSukadev Bhattiprolu * coprocessor type. 60762c4eda4SSukadev Bhattiprolu * 60862c4eda4SSukadev Bhattiprolu * Here, we save @window in the ->windows[] table. If it is a receive 60962c4eda4SSukadev Bhattiprolu * window, we also save the window in the ->rxwin[] table. 61062c4eda4SSukadev Bhattiprolu */ 61162c4eda4SSukadev Bhattiprolu static void set_vinst_win(struct vas_instance *vinst, 61262c4eda4SSukadev Bhattiprolu struct vas_window *window) 61362c4eda4SSukadev Bhattiprolu { 61462c4eda4SSukadev Bhattiprolu int id = window->winid; 61562c4eda4SSukadev Bhattiprolu 61662c4eda4SSukadev Bhattiprolu mutex_lock(&vinst->mutex); 61762c4eda4SSukadev Bhattiprolu 61862c4eda4SSukadev Bhattiprolu /* 61962c4eda4SSukadev Bhattiprolu * There should only be one receive window for a coprocessor type 62062c4eda4SSukadev Bhattiprolu * unless its a user (FTW) window. 62162c4eda4SSukadev Bhattiprolu */ 62262c4eda4SSukadev Bhattiprolu if (!window->user_win && !window->tx_win) { 62362c4eda4SSukadev Bhattiprolu WARN_ON_ONCE(vinst->rxwin[window->cop]); 62462c4eda4SSukadev Bhattiprolu vinst->rxwin[window->cop] = window; 62562c4eda4SSukadev Bhattiprolu } 62662c4eda4SSukadev Bhattiprolu 62762c4eda4SSukadev Bhattiprolu WARN_ON_ONCE(vinst->windows[id] != NULL); 62862c4eda4SSukadev Bhattiprolu vinst->windows[id] = window; 62962c4eda4SSukadev Bhattiprolu 63062c4eda4SSukadev Bhattiprolu mutex_unlock(&vinst->mutex); 63162c4eda4SSukadev Bhattiprolu } 63262c4eda4SSukadev Bhattiprolu 63362c4eda4SSukadev Bhattiprolu /* 63462c4eda4SSukadev Bhattiprolu * Clear this window from the table(s) of windows for this VAS instance. 63562c4eda4SSukadev Bhattiprolu * See also function header of set_vinst_win(). 63662c4eda4SSukadev Bhattiprolu */ 63798271d41SSukadev Bhattiprolu static void clear_vinst_win(struct vas_window *window) 63862c4eda4SSukadev Bhattiprolu { 63962c4eda4SSukadev Bhattiprolu int id = window->winid; 64062c4eda4SSukadev Bhattiprolu struct vas_instance *vinst = window->vinst; 64162c4eda4SSukadev Bhattiprolu 64262c4eda4SSukadev Bhattiprolu mutex_lock(&vinst->mutex); 64362c4eda4SSukadev Bhattiprolu 64462c4eda4SSukadev Bhattiprolu if (!window->user_win && !window->tx_win) { 64562c4eda4SSukadev Bhattiprolu WARN_ON_ONCE(!vinst->rxwin[window->cop]); 64662c4eda4SSukadev Bhattiprolu vinst->rxwin[window->cop] = NULL; 64762c4eda4SSukadev Bhattiprolu } 64862c4eda4SSukadev Bhattiprolu 64962c4eda4SSukadev Bhattiprolu WARN_ON_ONCE(vinst->windows[id] != window); 65062c4eda4SSukadev Bhattiprolu vinst->windows[id] = NULL; 65162c4eda4SSukadev Bhattiprolu 65262c4eda4SSukadev Bhattiprolu mutex_unlock(&vinst->mutex); 65362c4eda4SSukadev Bhattiprolu } 65462c4eda4SSukadev Bhattiprolu 65562c4eda4SSukadev Bhattiprolu static void init_winctx_for_rxwin(struct vas_window *rxwin, 65662c4eda4SSukadev Bhattiprolu struct vas_rx_win_attr *rxattr, 65762c4eda4SSukadev Bhattiprolu struct vas_winctx *winctx) 65862c4eda4SSukadev Bhattiprolu { 65962c4eda4SSukadev Bhattiprolu /* 66062c4eda4SSukadev Bhattiprolu * We first zero (memset()) all fields and only set non-zero fields. 66162c4eda4SSukadev Bhattiprolu * Following fields are 0/false but maybe deserve a comment: 66262c4eda4SSukadev Bhattiprolu * 66362c4eda4SSukadev Bhattiprolu * ->notify_os_intr_reg In powerNV, send intrs to HV 66462c4eda4SSukadev Bhattiprolu * ->notify_disable False for NX windows 66562c4eda4SSukadev Bhattiprolu * ->intr_disable False for Fault Windows 66662c4eda4SSukadev Bhattiprolu * ->xtra_write False for NX windows 66762c4eda4SSukadev Bhattiprolu * ->notify_early NA for NX windows 66862c4eda4SSukadev Bhattiprolu * ->rsvd_txbuf_count NA for Rx windows 66962c4eda4SSukadev Bhattiprolu * ->lpid, ->pid, ->tid NA for Rx windows 67062c4eda4SSukadev Bhattiprolu */ 67162c4eda4SSukadev Bhattiprolu 67262c4eda4SSukadev Bhattiprolu memset(winctx, 0, sizeof(struct vas_winctx)); 67362c4eda4SSukadev Bhattiprolu 67462c4eda4SSukadev Bhattiprolu winctx->rx_fifo = rxattr->rx_fifo; 67562c4eda4SSukadev Bhattiprolu winctx->rx_fifo_size = rxattr->rx_fifo_size; 67662c4eda4SSukadev Bhattiprolu winctx->wcreds_max = rxattr->wcreds_max ?: VAS_WCREDS_DEFAULT; 67762c4eda4SSukadev Bhattiprolu winctx->pin_win = rxattr->pin_win; 67862c4eda4SSukadev Bhattiprolu 67962c4eda4SSukadev Bhattiprolu winctx->nx_win = rxattr->nx_win; 68062c4eda4SSukadev Bhattiprolu winctx->fault_win = rxattr->fault_win; 68162c4eda4SSukadev Bhattiprolu winctx->rx_word_mode = rxattr->rx_win_ord_mode; 68262c4eda4SSukadev Bhattiprolu winctx->tx_word_mode = rxattr->tx_win_ord_mode; 68362c4eda4SSukadev Bhattiprolu winctx->rx_wcred_mode = rxattr->rx_wcred_mode; 68462c4eda4SSukadev Bhattiprolu winctx->tx_wcred_mode = rxattr->tx_wcred_mode; 68562c4eda4SSukadev Bhattiprolu 68662c4eda4SSukadev Bhattiprolu if (winctx->nx_win) { 68762c4eda4SSukadev Bhattiprolu winctx->data_stamp = true; 68862c4eda4SSukadev Bhattiprolu winctx->intr_disable = true; 68962c4eda4SSukadev Bhattiprolu winctx->pin_win = true; 69062c4eda4SSukadev Bhattiprolu 69162c4eda4SSukadev Bhattiprolu WARN_ON_ONCE(winctx->fault_win); 69262c4eda4SSukadev Bhattiprolu WARN_ON_ONCE(!winctx->rx_word_mode); 69362c4eda4SSukadev Bhattiprolu WARN_ON_ONCE(!winctx->tx_word_mode); 69462c4eda4SSukadev Bhattiprolu WARN_ON_ONCE(winctx->notify_after_count); 69562c4eda4SSukadev Bhattiprolu } else if (winctx->fault_win) { 69662c4eda4SSukadev Bhattiprolu winctx->notify_disable = true; 69762c4eda4SSukadev Bhattiprolu } else if (winctx->user_win) { 69862c4eda4SSukadev Bhattiprolu /* 69962c4eda4SSukadev Bhattiprolu * Section 1.8.1 Low Latency Core-Core Wake up of 70062c4eda4SSukadev Bhattiprolu * the VAS workbook: 70162c4eda4SSukadev Bhattiprolu * 70262c4eda4SSukadev Bhattiprolu * - disable credit checks ([tr]x_wcred_mode = false) 70362c4eda4SSukadev Bhattiprolu * - disable FIFO writes 70462c4eda4SSukadev Bhattiprolu * - enable ASB_Notify, disable interrupt 70562c4eda4SSukadev Bhattiprolu */ 70662c4eda4SSukadev Bhattiprolu winctx->fifo_disable = true; 70762c4eda4SSukadev Bhattiprolu winctx->intr_disable = true; 70862c4eda4SSukadev Bhattiprolu winctx->rx_fifo = NULL; 70962c4eda4SSukadev Bhattiprolu } 71062c4eda4SSukadev Bhattiprolu 71162c4eda4SSukadev Bhattiprolu winctx->lnotify_lpid = rxattr->lnotify_lpid; 71262c4eda4SSukadev Bhattiprolu winctx->lnotify_pid = rxattr->lnotify_pid; 71362c4eda4SSukadev Bhattiprolu winctx->lnotify_tid = rxattr->lnotify_tid; 71462c4eda4SSukadev Bhattiprolu winctx->pswid = rxattr->pswid; 71562c4eda4SSukadev Bhattiprolu winctx->dma_type = VAS_DMA_TYPE_INJECT; 71662c4eda4SSukadev Bhattiprolu winctx->tc_mode = rxattr->tc_mode; 71762c4eda4SSukadev Bhattiprolu 71862c4eda4SSukadev Bhattiprolu winctx->min_scope = VAS_SCOPE_LOCAL; 71962c4eda4SSukadev Bhattiprolu winctx->max_scope = VAS_SCOPE_VECTORED_GROUP; 72062c4eda4SSukadev Bhattiprolu } 72162c4eda4SSukadev Bhattiprolu 72262c4eda4SSukadev Bhattiprolu static bool rx_win_args_valid(enum vas_cop_type cop, 72362c4eda4SSukadev Bhattiprolu struct vas_rx_win_attr *attr) 72462c4eda4SSukadev Bhattiprolu { 72562c4eda4SSukadev Bhattiprolu dump_rx_win_attr(attr); 72662c4eda4SSukadev Bhattiprolu 72762c4eda4SSukadev Bhattiprolu if (cop >= VAS_COP_TYPE_MAX) 72862c4eda4SSukadev Bhattiprolu return false; 72962c4eda4SSukadev Bhattiprolu 73062c4eda4SSukadev Bhattiprolu if (cop != VAS_COP_TYPE_FTW && 73162c4eda4SSukadev Bhattiprolu attr->rx_fifo_size < VAS_RX_FIFO_SIZE_MIN) 73262c4eda4SSukadev Bhattiprolu return false; 73362c4eda4SSukadev Bhattiprolu 73462c4eda4SSukadev Bhattiprolu if (attr->rx_fifo_size > VAS_RX_FIFO_SIZE_MAX) 73562c4eda4SSukadev Bhattiprolu return false; 73662c4eda4SSukadev Bhattiprolu 73762c4eda4SSukadev Bhattiprolu if (attr->nx_win) { 73862c4eda4SSukadev Bhattiprolu /* cannot be fault or user window if it is nx */ 73962c4eda4SSukadev Bhattiprolu if (attr->fault_win || attr->user_win) 74062c4eda4SSukadev Bhattiprolu return false; 74162c4eda4SSukadev Bhattiprolu /* 74262c4eda4SSukadev Bhattiprolu * Section 3.1.4.32: NX Windows must not disable notification, 74362c4eda4SSukadev Bhattiprolu * and must not enable interrupts or early notification. 74462c4eda4SSukadev Bhattiprolu */ 74562c4eda4SSukadev Bhattiprolu if (attr->notify_disable || !attr->intr_disable || 74662c4eda4SSukadev Bhattiprolu attr->notify_early) 74762c4eda4SSukadev Bhattiprolu return false; 74862c4eda4SSukadev Bhattiprolu } else if (attr->fault_win) { 74962c4eda4SSukadev Bhattiprolu /* cannot be both fault and user window */ 75062c4eda4SSukadev Bhattiprolu if (attr->user_win) 75162c4eda4SSukadev Bhattiprolu return false; 75262c4eda4SSukadev Bhattiprolu 75362c4eda4SSukadev Bhattiprolu /* 75462c4eda4SSukadev Bhattiprolu * Section 3.1.4.32: Fault windows must disable notification 75562c4eda4SSukadev Bhattiprolu * but not interrupts. 75662c4eda4SSukadev Bhattiprolu */ 75762c4eda4SSukadev Bhattiprolu if (!attr->notify_disable || attr->intr_disable) 75862c4eda4SSukadev Bhattiprolu return false; 75962c4eda4SSukadev Bhattiprolu 76062c4eda4SSukadev Bhattiprolu } else if (attr->user_win) { 76162c4eda4SSukadev Bhattiprolu /* 76262c4eda4SSukadev Bhattiprolu * User receive windows are only for fast-thread-wakeup 76362c4eda4SSukadev Bhattiprolu * (FTW). They don't need a FIFO and must disable interrupts 76462c4eda4SSukadev Bhattiprolu */ 76562c4eda4SSukadev Bhattiprolu if (attr->rx_fifo || attr->rx_fifo_size || !attr->intr_disable) 76662c4eda4SSukadev Bhattiprolu return false; 76762c4eda4SSukadev Bhattiprolu } else { 76862c4eda4SSukadev Bhattiprolu /* Rx window must be one of NX or Fault or User window. */ 76962c4eda4SSukadev Bhattiprolu return false; 77062c4eda4SSukadev Bhattiprolu } 77162c4eda4SSukadev Bhattiprolu 77262c4eda4SSukadev Bhattiprolu return true; 77362c4eda4SSukadev Bhattiprolu } 77462c4eda4SSukadev Bhattiprolu 77562c4eda4SSukadev Bhattiprolu void vas_init_rx_win_attr(struct vas_rx_win_attr *rxattr, enum vas_cop_type cop) 77662c4eda4SSukadev Bhattiprolu { 77762c4eda4SSukadev Bhattiprolu memset(rxattr, 0, sizeof(*rxattr)); 77862c4eda4SSukadev Bhattiprolu 77962c4eda4SSukadev Bhattiprolu if (cop == VAS_COP_TYPE_842 || cop == VAS_COP_TYPE_842_HIPRI) { 78062c4eda4SSukadev Bhattiprolu rxattr->pin_win = true; 78162c4eda4SSukadev Bhattiprolu rxattr->nx_win = true; 78262c4eda4SSukadev Bhattiprolu rxattr->fault_win = false; 78362c4eda4SSukadev Bhattiprolu rxattr->intr_disable = true; 78462c4eda4SSukadev Bhattiprolu rxattr->rx_wcred_mode = true; 78562c4eda4SSukadev Bhattiprolu rxattr->tx_wcred_mode = true; 78662c4eda4SSukadev Bhattiprolu rxattr->rx_win_ord_mode = true; 78762c4eda4SSukadev Bhattiprolu rxattr->tx_win_ord_mode = true; 78862c4eda4SSukadev Bhattiprolu } else if (cop == VAS_COP_TYPE_FAULT) { 78962c4eda4SSukadev Bhattiprolu rxattr->pin_win = true; 79062c4eda4SSukadev Bhattiprolu rxattr->fault_win = true; 79162c4eda4SSukadev Bhattiprolu rxattr->notify_disable = true; 79262c4eda4SSukadev Bhattiprolu rxattr->rx_wcred_mode = true; 79362c4eda4SSukadev Bhattiprolu rxattr->tx_wcred_mode = true; 79462c4eda4SSukadev Bhattiprolu rxattr->rx_win_ord_mode = true; 79562c4eda4SSukadev Bhattiprolu rxattr->tx_win_ord_mode = true; 79662c4eda4SSukadev Bhattiprolu } else if (cop == VAS_COP_TYPE_FTW) { 79762c4eda4SSukadev Bhattiprolu rxattr->user_win = true; 79862c4eda4SSukadev Bhattiprolu rxattr->intr_disable = true; 79962c4eda4SSukadev Bhattiprolu 80062c4eda4SSukadev Bhattiprolu /* 80162c4eda4SSukadev Bhattiprolu * As noted in the VAS Workbook we disable credit checks. 80262c4eda4SSukadev Bhattiprolu * If we enable credit checks in the future, we must also 80362c4eda4SSukadev Bhattiprolu * implement a mechanism to return the user credits or new 80462c4eda4SSukadev Bhattiprolu * paste operations will fail. 80562c4eda4SSukadev Bhattiprolu */ 80662c4eda4SSukadev Bhattiprolu } 80762c4eda4SSukadev Bhattiprolu } 80862c4eda4SSukadev Bhattiprolu EXPORT_SYMBOL_GPL(vas_init_rx_win_attr); 80962c4eda4SSukadev Bhattiprolu 81062c4eda4SSukadev Bhattiprolu struct vas_window *vas_rx_win_open(int vasid, enum vas_cop_type cop, 81162c4eda4SSukadev Bhattiprolu struct vas_rx_win_attr *rxattr) 81262c4eda4SSukadev Bhattiprolu { 81362c4eda4SSukadev Bhattiprolu struct vas_window *rxwin; 81462c4eda4SSukadev Bhattiprolu struct vas_winctx winctx; 81562c4eda4SSukadev Bhattiprolu struct vas_instance *vinst; 81662c4eda4SSukadev Bhattiprolu 81762c4eda4SSukadev Bhattiprolu if (!rx_win_args_valid(cop, rxattr)) 81862c4eda4SSukadev Bhattiprolu return ERR_PTR(-EINVAL); 81962c4eda4SSukadev Bhattiprolu 82062c4eda4SSukadev Bhattiprolu vinst = find_vas_instance(vasid); 82162c4eda4SSukadev Bhattiprolu if (!vinst) { 82262c4eda4SSukadev Bhattiprolu pr_devel("vasid %d not found!\n", vasid); 82362c4eda4SSukadev Bhattiprolu return ERR_PTR(-EINVAL); 82462c4eda4SSukadev Bhattiprolu } 82562c4eda4SSukadev Bhattiprolu pr_devel("Found instance %d\n", vasid); 82662c4eda4SSukadev Bhattiprolu 82762c4eda4SSukadev Bhattiprolu rxwin = vas_window_alloc(vinst); 82862c4eda4SSukadev Bhattiprolu if (IS_ERR(rxwin)) { 82962c4eda4SSukadev Bhattiprolu pr_devel("Unable to allocate memory for Rx window\n"); 83062c4eda4SSukadev Bhattiprolu return rxwin; 83162c4eda4SSukadev Bhattiprolu } 83262c4eda4SSukadev Bhattiprolu 83362c4eda4SSukadev Bhattiprolu rxwin->tx_win = false; 83462c4eda4SSukadev Bhattiprolu rxwin->nx_win = rxattr->nx_win; 83562c4eda4SSukadev Bhattiprolu rxwin->user_win = rxattr->user_win; 83662c4eda4SSukadev Bhattiprolu rxwin->cop = cop; 83762c4eda4SSukadev Bhattiprolu if (rxattr->user_win) 83862c4eda4SSukadev Bhattiprolu rxwin->pid = task_pid_vnr(current); 83962c4eda4SSukadev Bhattiprolu 84062c4eda4SSukadev Bhattiprolu init_winctx_for_rxwin(rxwin, rxattr, &winctx); 84162c4eda4SSukadev Bhattiprolu init_winctx_regs(rxwin, &winctx); 84262c4eda4SSukadev Bhattiprolu 84362c4eda4SSukadev Bhattiprolu set_vinst_win(vinst, rxwin); 84462c4eda4SSukadev Bhattiprolu 84562c4eda4SSukadev Bhattiprolu return rxwin; 84662c4eda4SSukadev Bhattiprolu } 84762c4eda4SSukadev Bhattiprolu EXPORT_SYMBOL_GPL(vas_rx_win_open); 84862c4eda4SSukadev Bhattiprolu 8495239af67SSukadev Bhattiprolu void vas_init_tx_win_attr(struct vas_tx_win_attr *txattr, enum vas_cop_type cop) 8505239af67SSukadev Bhattiprolu { 8515239af67SSukadev Bhattiprolu memset(txattr, 0, sizeof(*txattr)); 8525239af67SSukadev Bhattiprolu 8535239af67SSukadev Bhattiprolu if (cop == VAS_COP_TYPE_842 || cop == VAS_COP_TYPE_842_HIPRI) { 8545239af67SSukadev Bhattiprolu txattr->rej_no_credit = false; 8555239af67SSukadev Bhattiprolu txattr->rx_wcred_mode = true; 8565239af67SSukadev Bhattiprolu txattr->tx_wcred_mode = true; 8575239af67SSukadev Bhattiprolu txattr->rx_win_ord_mode = true; 8585239af67SSukadev Bhattiprolu txattr->tx_win_ord_mode = true; 8595239af67SSukadev Bhattiprolu } else if (cop == VAS_COP_TYPE_FTW) { 8605239af67SSukadev Bhattiprolu txattr->user_win = true; 8615239af67SSukadev Bhattiprolu } 8625239af67SSukadev Bhattiprolu } 8635239af67SSukadev Bhattiprolu EXPORT_SYMBOL_GPL(vas_init_tx_win_attr); 8645239af67SSukadev Bhattiprolu 8655239af67SSukadev Bhattiprolu static void init_winctx_for_txwin(struct vas_window *txwin, 8665239af67SSukadev Bhattiprolu struct vas_tx_win_attr *txattr, 8675239af67SSukadev Bhattiprolu struct vas_winctx *winctx) 8685239af67SSukadev Bhattiprolu { 8695239af67SSukadev Bhattiprolu /* 8705239af67SSukadev Bhattiprolu * We first zero all fields and only set non-zero ones. Following 8715239af67SSukadev Bhattiprolu * are some fields set to 0/false for the stated reason: 8725239af67SSukadev Bhattiprolu * 8735239af67SSukadev Bhattiprolu * ->notify_os_intr_reg In powernv, send intrs to HV 8745239af67SSukadev Bhattiprolu * ->rsvd_txbuf_count Not supported yet. 8755239af67SSukadev Bhattiprolu * ->notify_disable False for NX windows 8765239af67SSukadev Bhattiprolu * ->xtra_write False for NX windows 8775239af67SSukadev Bhattiprolu * ->notify_early NA for NX windows 8785239af67SSukadev Bhattiprolu * ->lnotify_lpid NA for Tx windows 8795239af67SSukadev Bhattiprolu * ->lnotify_pid NA for Tx windows 8805239af67SSukadev Bhattiprolu * ->lnotify_tid NA for Tx windows 8815239af67SSukadev Bhattiprolu * ->tx_win_cred_mode Ignore for now for NX windows 8825239af67SSukadev Bhattiprolu * ->rx_win_cred_mode Ignore for now for NX windows 8835239af67SSukadev Bhattiprolu */ 8845239af67SSukadev Bhattiprolu memset(winctx, 0, sizeof(struct vas_winctx)); 8855239af67SSukadev Bhattiprolu 8865239af67SSukadev Bhattiprolu winctx->wcreds_max = txattr->wcreds_max ?: VAS_WCREDS_DEFAULT; 8875239af67SSukadev Bhattiprolu 8885239af67SSukadev Bhattiprolu winctx->user_win = txattr->user_win; 8895239af67SSukadev Bhattiprolu winctx->nx_win = txwin->rxwin->nx_win; 8905239af67SSukadev Bhattiprolu winctx->pin_win = txattr->pin_win; 8915239af67SSukadev Bhattiprolu 8925239af67SSukadev Bhattiprolu winctx->rx_wcred_mode = txattr->rx_wcred_mode; 8935239af67SSukadev Bhattiprolu winctx->tx_wcred_mode = txattr->tx_wcred_mode; 8945239af67SSukadev Bhattiprolu winctx->rx_word_mode = txattr->rx_win_ord_mode; 8955239af67SSukadev Bhattiprolu winctx->tx_word_mode = txattr->tx_win_ord_mode; 8965239af67SSukadev Bhattiprolu 8975239af67SSukadev Bhattiprolu if (winctx->nx_win) { 8985239af67SSukadev Bhattiprolu winctx->data_stamp = true; 8995239af67SSukadev Bhattiprolu winctx->intr_disable = true; 9005239af67SSukadev Bhattiprolu } 9015239af67SSukadev Bhattiprolu 9025239af67SSukadev Bhattiprolu winctx->lpid = txattr->lpid; 9035239af67SSukadev Bhattiprolu winctx->pidr = txattr->pidr; 9045239af67SSukadev Bhattiprolu winctx->rx_win_id = txwin->rxwin->winid; 9055239af67SSukadev Bhattiprolu 9065239af67SSukadev Bhattiprolu winctx->dma_type = VAS_DMA_TYPE_INJECT; 9075239af67SSukadev Bhattiprolu winctx->tc_mode = txattr->tc_mode; 9085239af67SSukadev Bhattiprolu winctx->min_scope = VAS_SCOPE_LOCAL; 9095239af67SSukadev Bhattiprolu winctx->max_scope = VAS_SCOPE_VECTORED_GROUP; 9105239af67SSukadev Bhattiprolu 9115239af67SSukadev Bhattiprolu winctx->pswid = 0; 9125239af67SSukadev Bhattiprolu } 9135239af67SSukadev Bhattiprolu 9145239af67SSukadev Bhattiprolu static bool tx_win_args_valid(enum vas_cop_type cop, 9155239af67SSukadev Bhattiprolu struct vas_tx_win_attr *attr) 9165239af67SSukadev Bhattiprolu { 9175239af67SSukadev Bhattiprolu if (attr->tc_mode != VAS_THRESH_DISABLED) 9185239af67SSukadev Bhattiprolu return false; 9195239af67SSukadev Bhattiprolu 9205239af67SSukadev Bhattiprolu if (cop > VAS_COP_TYPE_MAX) 9215239af67SSukadev Bhattiprolu return false; 9225239af67SSukadev Bhattiprolu 9235239af67SSukadev Bhattiprolu if (attr->user_win && 9245239af67SSukadev Bhattiprolu (cop != VAS_COP_TYPE_FTW || attr->rsvd_txbuf_count)) 9255239af67SSukadev Bhattiprolu return false; 9265239af67SSukadev Bhattiprolu 9275239af67SSukadev Bhattiprolu return true; 9285239af67SSukadev Bhattiprolu } 9295239af67SSukadev Bhattiprolu 9305239af67SSukadev Bhattiprolu struct vas_window *vas_tx_win_open(int vasid, enum vas_cop_type cop, 9315239af67SSukadev Bhattiprolu struct vas_tx_win_attr *attr) 9325239af67SSukadev Bhattiprolu { 9335239af67SSukadev Bhattiprolu int rc; 9345239af67SSukadev Bhattiprolu struct vas_window *txwin; 9355239af67SSukadev Bhattiprolu struct vas_window *rxwin; 9365239af67SSukadev Bhattiprolu struct vas_winctx winctx; 9375239af67SSukadev Bhattiprolu struct vas_instance *vinst; 9385239af67SSukadev Bhattiprolu 9395239af67SSukadev Bhattiprolu if (!tx_win_args_valid(cop, attr)) 9405239af67SSukadev Bhattiprolu return ERR_PTR(-EINVAL); 9415239af67SSukadev Bhattiprolu 9425239af67SSukadev Bhattiprolu vinst = find_vas_instance(vasid); 9435239af67SSukadev Bhattiprolu if (!vinst) { 9445239af67SSukadev Bhattiprolu pr_devel("vasid %d not found!\n", vasid); 9455239af67SSukadev Bhattiprolu return ERR_PTR(-EINVAL); 9465239af67SSukadev Bhattiprolu } 9475239af67SSukadev Bhattiprolu 9485239af67SSukadev Bhattiprolu rxwin = get_vinst_rxwin(vinst, cop, attr->pswid); 9495239af67SSukadev Bhattiprolu if (IS_ERR(rxwin)) { 9505239af67SSukadev Bhattiprolu pr_devel("No RxWin for vasid %d, cop %d\n", vasid, cop); 9515239af67SSukadev Bhattiprolu return rxwin; 9525239af67SSukadev Bhattiprolu } 9535239af67SSukadev Bhattiprolu 9545239af67SSukadev Bhattiprolu txwin = vas_window_alloc(vinst); 9555239af67SSukadev Bhattiprolu if (IS_ERR(txwin)) { 9565239af67SSukadev Bhattiprolu rc = PTR_ERR(txwin); 9575239af67SSukadev Bhattiprolu goto put_rxwin; 9585239af67SSukadev Bhattiprolu } 9595239af67SSukadev Bhattiprolu 9605239af67SSukadev Bhattiprolu txwin->tx_win = 1; 9615239af67SSukadev Bhattiprolu txwin->rxwin = rxwin; 9625239af67SSukadev Bhattiprolu txwin->nx_win = txwin->rxwin->nx_win; 9635239af67SSukadev Bhattiprolu txwin->pid = attr->pid; 9645239af67SSukadev Bhattiprolu txwin->user_win = attr->user_win; 9655239af67SSukadev Bhattiprolu 9665239af67SSukadev Bhattiprolu init_winctx_for_txwin(txwin, attr, &winctx); 9675239af67SSukadev Bhattiprolu 9685239af67SSukadev Bhattiprolu init_winctx_regs(txwin, &winctx); 9695239af67SSukadev Bhattiprolu 9705239af67SSukadev Bhattiprolu /* 9715239af67SSukadev Bhattiprolu * If its a kernel send window, map the window address into the 9725239af67SSukadev Bhattiprolu * kernel's address space. For user windows, user must issue an 9735239af67SSukadev Bhattiprolu * mmap() to map the window into their address space. 9745239af67SSukadev Bhattiprolu * 9755239af67SSukadev Bhattiprolu * NOTE: If kernel ever resubmits a user CRB after handling a page 9765239af67SSukadev Bhattiprolu * fault, we will need to map this into kernel as well. 9775239af67SSukadev Bhattiprolu */ 9785239af67SSukadev Bhattiprolu if (!txwin->user_win) { 9795239af67SSukadev Bhattiprolu txwin->paste_kaddr = map_paste_region(txwin); 9805239af67SSukadev Bhattiprolu if (IS_ERR(txwin->paste_kaddr)) { 9815239af67SSukadev Bhattiprolu rc = PTR_ERR(txwin->paste_kaddr); 9825239af67SSukadev Bhattiprolu goto free_window; 9835239af67SSukadev Bhattiprolu } 9845239af67SSukadev Bhattiprolu } 9855239af67SSukadev Bhattiprolu 9865239af67SSukadev Bhattiprolu set_vinst_win(vinst, txwin); 9875239af67SSukadev Bhattiprolu 9885239af67SSukadev Bhattiprolu return txwin; 9895239af67SSukadev Bhattiprolu 9905239af67SSukadev Bhattiprolu free_window: 9915239af67SSukadev Bhattiprolu vas_window_free(txwin); 9925239af67SSukadev Bhattiprolu 9935239af67SSukadev Bhattiprolu put_rxwin: 9945239af67SSukadev Bhattiprolu put_rx_win(rxwin); 9955239af67SSukadev Bhattiprolu return ERR_PTR(rc); 9965239af67SSukadev Bhattiprolu 9975239af67SSukadev Bhattiprolu } 9985239af67SSukadev Bhattiprolu EXPORT_SYMBOL_GPL(vas_tx_win_open); 9995239af67SSukadev Bhattiprolu 100098271d41SSukadev Bhattiprolu static void poll_window_busy_state(struct vas_window *window) 100198271d41SSukadev Bhattiprolu { 100298271d41SSukadev Bhattiprolu int busy; 100398271d41SSukadev Bhattiprolu u64 val; 100498271d41SSukadev Bhattiprolu 100598271d41SSukadev Bhattiprolu retry: 100698271d41SSukadev Bhattiprolu /* 100798271d41SSukadev Bhattiprolu * Poll Window Busy flag 100898271d41SSukadev Bhattiprolu */ 100998271d41SSukadev Bhattiprolu val = read_hvwc_reg(window, VREG(WIN_STATUS)); 101098271d41SSukadev Bhattiprolu busy = GET_FIELD(VAS_WIN_BUSY, val); 101198271d41SSukadev Bhattiprolu if (busy) { 101298271d41SSukadev Bhattiprolu val = 0; 101398271d41SSukadev Bhattiprolu set_current_state(TASK_UNINTERRUPTIBLE); 101498271d41SSukadev Bhattiprolu schedule_timeout(HZ); 101598271d41SSukadev Bhattiprolu goto retry; 101698271d41SSukadev Bhattiprolu } 101798271d41SSukadev Bhattiprolu } 101898271d41SSukadev Bhattiprolu 101998271d41SSukadev Bhattiprolu static void poll_window_castout(struct vas_window *window) 102098271d41SSukadev Bhattiprolu { 102198271d41SSukadev Bhattiprolu int cached; 102298271d41SSukadev Bhattiprolu u64 val; 102398271d41SSukadev Bhattiprolu 102498271d41SSukadev Bhattiprolu /* Cast window context out of the cache */ 102598271d41SSukadev Bhattiprolu retry: 102698271d41SSukadev Bhattiprolu val = read_hvwc_reg(window, VREG(WIN_CTX_CACHING_CTL)); 102798271d41SSukadev Bhattiprolu cached = GET_FIELD(VAS_WIN_CACHE_STATUS, val); 102898271d41SSukadev Bhattiprolu if (cached) { 102998271d41SSukadev Bhattiprolu val = 0ULL; 103098271d41SSukadev Bhattiprolu val = SET_FIELD(VAS_CASTOUT_REQ, val, 1); 103198271d41SSukadev Bhattiprolu val = SET_FIELD(VAS_PUSH_TO_MEM, val, 0); 103298271d41SSukadev Bhattiprolu write_hvwc_reg(window, VREG(WIN_CTX_CACHING_CTL), val); 103398271d41SSukadev Bhattiprolu 103498271d41SSukadev Bhattiprolu set_current_state(TASK_UNINTERRUPTIBLE); 103598271d41SSukadev Bhattiprolu schedule_timeout(HZ); 103698271d41SSukadev Bhattiprolu goto retry; 103798271d41SSukadev Bhattiprolu } 103898271d41SSukadev Bhattiprolu } 103998271d41SSukadev Bhattiprolu 104098271d41SSukadev Bhattiprolu /* 104198271d41SSukadev Bhattiprolu * Close a window. 104298271d41SSukadev Bhattiprolu * 104398271d41SSukadev Bhattiprolu * See Section 1.12.1 of VAS workbook v1.05 for details on closing window: 104498271d41SSukadev Bhattiprolu * - Disable new paste operations (unmap paste address) 104598271d41SSukadev Bhattiprolu * - Poll for the "Window Busy" bit to be cleared 104698271d41SSukadev Bhattiprolu * - Clear the Open/Enable bit for the Window. 104798271d41SSukadev Bhattiprolu * - Poll for return of window Credits (implies FIFO empty for Rx win?) 104898271d41SSukadev Bhattiprolu * - Unpin and cast window context out of cache 104998271d41SSukadev Bhattiprolu * 105098271d41SSukadev Bhattiprolu * Besides the hardware, kernel has some bookkeeping of course. 105198271d41SSukadev Bhattiprolu */ 10524dea2d1aSSukadev Bhattiprolu int vas_win_close(struct vas_window *window) 10534dea2d1aSSukadev Bhattiprolu { 105498271d41SSukadev Bhattiprolu u64 val; 105598271d41SSukadev Bhattiprolu 105698271d41SSukadev Bhattiprolu if (!window) 105798271d41SSukadev Bhattiprolu return 0; 105898271d41SSukadev Bhattiprolu 105998271d41SSukadev Bhattiprolu if (!window->tx_win && atomic_read(&window->num_txwins) != 0) { 106098271d41SSukadev Bhattiprolu pr_devel("Attempting to close an active Rx window!\n"); 106198271d41SSukadev Bhattiprolu WARN_ON_ONCE(1); 106298271d41SSukadev Bhattiprolu return -EBUSY; 10634dea2d1aSSukadev Bhattiprolu } 106498271d41SSukadev Bhattiprolu 106598271d41SSukadev Bhattiprolu unmap_paste_region(window); 106698271d41SSukadev Bhattiprolu 106798271d41SSukadev Bhattiprolu clear_vinst_win(window); 106898271d41SSukadev Bhattiprolu 106998271d41SSukadev Bhattiprolu poll_window_busy_state(window); 107098271d41SSukadev Bhattiprolu 107198271d41SSukadev Bhattiprolu /* Unpin window from cache and close it */ 107298271d41SSukadev Bhattiprolu val = read_hvwc_reg(window, VREG(WINCTL)); 107398271d41SSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_PIN, val, 0); 107498271d41SSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_OPEN, val, 0); 107598271d41SSukadev Bhattiprolu write_hvwc_reg(window, VREG(WINCTL), val); 107698271d41SSukadev Bhattiprolu 107798271d41SSukadev Bhattiprolu poll_window_castout(window); 107898271d41SSukadev Bhattiprolu 107998271d41SSukadev Bhattiprolu /* if send window, drop reference to matching receive window */ 108098271d41SSukadev Bhattiprolu if (window->tx_win) 108198271d41SSukadev Bhattiprolu put_rx_win(window->rxwin); 108298271d41SSukadev Bhattiprolu 108398271d41SSukadev Bhattiprolu vas_window_free(window); 108498271d41SSukadev Bhattiprolu 108598271d41SSukadev Bhattiprolu return 0; 108698271d41SSukadev Bhattiprolu } 108798271d41SSukadev Bhattiprolu EXPORT_SYMBOL_GPL(vas_win_close); 1088