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> 196c8e6bb2SSukadev Bhattiprolu #include <asm/switch_to.h> 206c8e6bb2SSukadev Bhattiprolu #include <asm/ppc-opcode.h> 214dea2d1aSSukadev Bhattiprolu #include "vas.h" 222392c8c8SSukadev Bhattiprolu #include "copy-paste.h" 234dea2d1aSSukadev Bhattiprolu 24007bb7d6SSukadev Bhattiprolu #define CREATE_TRACE_POINTS 25007bb7d6SSukadev Bhattiprolu #include "vas-trace.h" 26007bb7d6SSukadev Bhattiprolu 27180fe15aSSukadev Bhattiprolu /* 28180fe15aSSukadev Bhattiprolu * Compute the paste address region for the window @window using the 29180fe15aSSukadev Bhattiprolu * ->paste_base_addr and ->paste_win_id_shift we got from device tree. 30180fe15aSSukadev Bhattiprolu */ 31180fe15aSSukadev Bhattiprolu static void compute_paste_address(struct vas_window *window, u64 *addr, int *len) 32180fe15aSSukadev Bhattiprolu { 33180fe15aSSukadev Bhattiprolu int winid; 34180fe15aSSukadev Bhattiprolu u64 base, shift; 35180fe15aSSukadev Bhattiprolu 36180fe15aSSukadev Bhattiprolu base = window->vinst->paste_base_addr; 37180fe15aSSukadev Bhattiprolu shift = window->vinst->paste_win_id_shift; 38180fe15aSSukadev Bhattiprolu winid = window->winid; 39180fe15aSSukadev Bhattiprolu 40180fe15aSSukadev Bhattiprolu *addr = base + (winid << shift); 41180fe15aSSukadev Bhattiprolu if (len) 42180fe15aSSukadev Bhattiprolu *len = PAGE_SIZE; 43180fe15aSSukadev Bhattiprolu 44180fe15aSSukadev Bhattiprolu pr_debug("Txwin #%d: Paste addr 0x%llx\n", winid, *addr); 45180fe15aSSukadev Bhattiprolu } 46180fe15aSSukadev Bhattiprolu 475676be2fSSukadev Bhattiprolu u64 vas_win_paste_addr(struct vas_window *win) 485676be2fSSukadev Bhattiprolu { 495676be2fSSukadev Bhattiprolu u64 addr; 505676be2fSSukadev Bhattiprolu 515676be2fSSukadev Bhattiprolu compute_paste_address(win, &addr, NULL); 525676be2fSSukadev Bhattiprolu 535676be2fSSukadev Bhattiprolu return addr; 545676be2fSSukadev Bhattiprolu } 555676be2fSSukadev Bhattiprolu EXPORT_SYMBOL(vas_win_paste_addr); 565676be2fSSukadev Bhattiprolu 57180fe15aSSukadev Bhattiprolu static inline void get_hvwc_mmio_bar(struct vas_window *window, 58180fe15aSSukadev Bhattiprolu u64 *start, int *len) 59180fe15aSSukadev Bhattiprolu { 60180fe15aSSukadev Bhattiprolu u64 pbaddr; 61180fe15aSSukadev Bhattiprolu 62180fe15aSSukadev Bhattiprolu pbaddr = window->vinst->hvwc_bar_start; 63180fe15aSSukadev Bhattiprolu *start = pbaddr + window->winid * VAS_HVWC_SIZE; 64180fe15aSSukadev Bhattiprolu *len = VAS_HVWC_SIZE; 65180fe15aSSukadev Bhattiprolu } 66180fe15aSSukadev Bhattiprolu 67180fe15aSSukadev Bhattiprolu static inline void get_uwc_mmio_bar(struct vas_window *window, 68180fe15aSSukadev Bhattiprolu u64 *start, int *len) 69180fe15aSSukadev Bhattiprolu { 70180fe15aSSukadev Bhattiprolu u64 pbaddr; 71180fe15aSSukadev Bhattiprolu 72180fe15aSSukadev Bhattiprolu pbaddr = window->vinst->uwc_bar_start; 73180fe15aSSukadev Bhattiprolu *start = pbaddr + window->winid * VAS_UWC_SIZE; 74180fe15aSSukadev Bhattiprolu *len = VAS_UWC_SIZE; 75180fe15aSSukadev Bhattiprolu } 76180fe15aSSukadev Bhattiprolu 77180fe15aSSukadev Bhattiprolu /* 78180fe15aSSukadev Bhattiprolu * Map the paste bus address of the given send window into kernel address 79180fe15aSSukadev Bhattiprolu * space. Unlike MMIO regions (map_mmio_region() below), paste region must 80180fe15aSSukadev Bhattiprolu * be mapped cache-able and is only applicable to send windows. 81180fe15aSSukadev Bhattiprolu */ 825239af67SSukadev Bhattiprolu static void *map_paste_region(struct vas_window *txwin) 83180fe15aSSukadev Bhattiprolu { 84180fe15aSSukadev Bhattiprolu int len; 85180fe15aSSukadev Bhattiprolu void *map; 86180fe15aSSukadev Bhattiprolu char *name; 87180fe15aSSukadev Bhattiprolu u64 start; 88180fe15aSSukadev Bhattiprolu 89180fe15aSSukadev Bhattiprolu name = kasprintf(GFP_KERNEL, "window-v%d-w%d", txwin->vinst->vas_id, 90180fe15aSSukadev Bhattiprolu txwin->winid); 91180fe15aSSukadev Bhattiprolu if (!name) 92180fe15aSSukadev Bhattiprolu goto free_name; 93180fe15aSSukadev Bhattiprolu 94180fe15aSSukadev Bhattiprolu txwin->paste_addr_name = name; 95180fe15aSSukadev Bhattiprolu compute_paste_address(txwin, &start, &len); 96180fe15aSSukadev Bhattiprolu 97180fe15aSSukadev Bhattiprolu if (!request_mem_region(start, len, name)) { 98180fe15aSSukadev Bhattiprolu pr_devel("%s(): request_mem_region(0x%llx, %d) failed\n", 99180fe15aSSukadev Bhattiprolu __func__, start, len); 100180fe15aSSukadev Bhattiprolu goto free_name; 101180fe15aSSukadev Bhattiprolu } 102180fe15aSSukadev Bhattiprolu 103180fe15aSSukadev Bhattiprolu map = ioremap_cache(start, len); 104180fe15aSSukadev Bhattiprolu if (!map) { 105180fe15aSSukadev Bhattiprolu pr_devel("%s(): ioremap_cache(0x%llx, %d) failed\n", __func__, 106180fe15aSSukadev Bhattiprolu start, len); 107180fe15aSSukadev Bhattiprolu goto free_name; 108180fe15aSSukadev Bhattiprolu } 109180fe15aSSukadev Bhattiprolu 110180fe15aSSukadev Bhattiprolu pr_devel("Mapped paste addr 0x%llx to kaddr 0x%p\n", start, map); 111180fe15aSSukadev Bhattiprolu return map; 112180fe15aSSukadev Bhattiprolu 113180fe15aSSukadev Bhattiprolu free_name: 114180fe15aSSukadev Bhattiprolu kfree(name); 115180fe15aSSukadev Bhattiprolu return ERR_PTR(-ENOMEM); 116180fe15aSSukadev Bhattiprolu } 117180fe15aSSukadev Bhattiprolu 118180fe15aSSukadev Bhattiprolu static void *map_mmio_region(char *name, u64 start, int len) 119180fe15aSSukadev Bhattiprolu { 120180fe15aSSukadev Bhattiprolu void *map; 121180fe15aSSukadev Bhattiprolu 122180fe15aSSukadev Bhattiprolu if (!request_mem_region(start, len, name)) { 123180fe15aSSukadev Bhattiprolu pr_devel("%s(): request_mem_region(0x%llx, %d) failed\n", 124180fe15aSSukadev Bhattiprolu __func__, start, len); 125180fe15aSSukadev Bhattiprolu return NULL; 126180fe15aSSukadev Bhattiprolu } 127180fe15aSSukadev Bhattiprolu 128180fe15aSSukadev Bhattiprolu map = ioremap(start, len); 129180fe15aSSukadev Bhattiprolu if (!map) { 130180fe15aSSukadev Bhattiprolu pr_devel("%s(): ioremap(0x%llx, %d) failed\n", __func__, start, 131180fe15aSSukadev Bhattiprolu len); 132180fe15aSSukadev Bhattiprolu return NULL; 133180fe15aSSukadev Bhattiprolu } 134180fe15aSSukadev Bhattiprolu 135180fe15aSSukadev Bhattiprolu return map; 136180fe15aSSukadev Bhattiprolu } 137180fe15aSSukadev Bhattiprolu 138180fe15aSSukadev Bhattiprolu static void unmap_region(void *addr, u64 start, int len) 139180fe15aSSukadev Bhattiprolu { 140180fe15aSSukadev Bhattiprolu iounmap(addr); 141180fe15aSSukadev Bhattiprolu release_mem_region((phys_addr_t)start, len); 142180fe15aSSukadev Bhattiprolu } 143180fe15aSSukadev Bhattiprolu 144180fe15aSSukadev Bhattiprolu /* 145180fe15aSSukadev Bhattiprolu * Unmap the paste address region for a window. 146180fe15aSSukadev Bhattiprolu */ 14798271d41SSukadev Bhattiprolu static void unmap_paste_region(struct vas_window *window) 148180fe15aSSukadev Bhattiprolu { 149180fe15aSSukadev Bhattiprolu int len; 150180fe15aSSukadev Bhattiprolu u64 busaddr_start; 151180fe15aSSukadev Bhattiprolu 152180fe15aSSukadev Bhattiprolu if (window->paste_kaddr) { 153180fe15aSSukadev Bhattiprolu compute_paste_address(window, &busaddr_start, &len); 154180fe15aSSukadev Bhattiprolu unmap_region(window->paste_kaddr, busaddr_start, len); 155180fe15aSSukadev Bhattiprolu window->paste_kaddr = NULL; 156180fe15aSSukadev Bhattiprolu kfree(window->paste_addr_name); 157180fe15aSSukadev Bhattiprolu window->paste_addr_name = NULL; 158180fe15aSSukadev Bhattiprolu } 159180fe15aSSukadev Bhattiprolu } 160180fe15aSSukadev Bhattiprolu 161180fe15aSSukadev Bhattiprolu /* 162ece4e512SSukadev Bhattiprolu * Unmap the MMIO regions for a window. Hold the vas_mutex so we don't 163ece4e512SSukadev Bhattiprolu * unmap when the window's debugfs dir is in use. This serializes close 164ece4e512SSukadev Bhattiprolu * of a window even on another VAS instance but since its not a critical 165ece4e512SSukadev Bhattiprolu * path, just minimize the time we hold the mutex for now. We can add 166ece4e512SSukadev Bhattiprolu * a per-instance mutex later if necessary. 167180fe15aSSukadev Bhattiprolu */ 168180fe15aSSukadev Bhattiprolu static void unmap_winctx_mmio_bars(struct vas_window *window) 169180fe15aSSukadev Bhattiprolu { 170180fe15aSSukadev Bhattiprolu int len; 171ece4e512SSukadev Bhattiprolu void *uwc_map; 172ece4e512SSukadev Bhattiprolu void *hvwc_map; 173180fe15aSSukadev Bhattiprolu u64 busaddr_start; 174180fe15aSSukadev Bhattiprolu 175ece4e512SSukadev Bhattiprolu mutex_lock(&vas_mutex); 176ece4e512SSukadev Bhattiprolu 177ece4e512SSukadev Bhattiprolu hvwc_map = window->hvwc_map; 178180fe15aSSukadev Bhattiprolu window->hvwc_map = NULL; 179ece4e512SSukadev Bhattiprolu 180ece4e512SSukadev Bhattiprolu uwc_map = window->uwc_map; 181ece4e512SSukadev Bhattiprolu window->uwc_map = NULL; 182ece4e512SSukadev Bhattiprolu 183ece4e512SSukadev Bhattiprolu mutex_unlock(&vas_mutex); 184ece4e512SSukadev Bhattiprolu 185ece4e512SSukadev Bhattiprolu if (hvwc_map) { 186ece4e512SSukadev Bhattiprolu get_hvwc_mmio_bar(window, &busaddr_start, &len); 187ece4e512SSukadev Bhattiprolu unmap_region(hvwc_map, busaddr_start, len); 188180fe15aSSukadev Bhattiprolu } 189180fe15aSSukadev Bhattiprolu 190ece4e512SSukadev Bhattiprolu if (uwc_map) { 191180fe15aSSukadev Bhattiprolu get_uwc_mmio_bar(window, &busaddr_start, &len); 192ece4e512SSukadev Bhattiprolu unmap_region(uwc_map, busaddr_start, len); 193180fe15aSSukadev Bhattiprolu } 194180fe15aSSukadev Bhattiprolu } 195180fe15aSSukadev Bhattiprolu 196180fe15aSSukadev Bhattiprolu /* 197180fe15aSSukadev Bhattiprolu * Find the Hypervisor Window Context (HVWC) MMIO Base Address Region and the 198180fe15aSSukadev Bhattiprolu * OS/User Window Context (UWC) MMIO Base Address Region for the given window. 199180fe15aSSukadev Bhattiprolu * Map these bus addresses and save the mapped kernel addresses in @window. 200180fe15aSSukadev Bhattiprolu */ 201180fe15aSSukadev Bhattiprolu int map_winctx_mmio_bars(struct vas_window *window) 202180fe15aSSukadev Bhattiprolu { 203180fe15aSSukadev Bhattiprolu int len; 204180fe15aSSukadev Bhattiprolu u64 start; 205180fe15aSSukadev Bhattiprolu 206180fe15aSSukadev Bhattiprolu get_hvwc_mmio_bar(window, &start, &len); 207180fe15aSSukadev Bhattiprolu window->hvwc_map = map_mmio_region("HVWCM_Window", start, len); 208180fe15aSSukadev Bhattiprolu 209180fe15aSSukadev Bhattiprolu get_uwc_mmio_bar(window, &start, &len); 210180fe15aSSukadev Bhattiprolu window->uwc_map = map_mmio_region("UWCM_Window", start, len); 211180fe15aSSukadev Bhattiprolu 212180fe15aSSukadev Bhattiprolu if (!window->hvwc_map || !window->uwc_map) { 213180fe15aSSukadev Bhattiprolu unmap_winctx_mmio_bars(window); 214180fe15aSSukadev Bhattiprolu return -1; 215180fe15aSSukadev Bhattiprolu } 216180fe15aSSukadev Bhattiprolu 217180fe15aSSukadev Bhattiprolu return 0; 218180fe15aSSukadev Bhattiprolu } 219180fe15aSSukadev Bhattiprolu 220b25b33acSSukadev Bhattiprolu /* 221b25b33acSSukadev Bhattiprolu * Reset all valid registers in the HV and OS/User Window Contexts for 222b25b33acSSukadev Bhattiprolu * the window identified by @window. 223b25b33acSSukadev Bhattiprolu * 224b25b33acSSukadev Bhattiprolu * NOTE: We cannot really use a for loop to reset window context. Not all 225b25b33acSSukadev Bhattiprolu * offsets in a window context are valid registers and the valid 226b25b33acSSukadev Bhattiprolu * registers are not sequential. And, we can only write to offsets 227b25b33acSSukadev Bhattiprolu * with valid registers. 228b25b33acSSukadev Bhattiprolu */ 229b25b33acSSukadev Bhattiprolu void reset_window_regs(struct vas_window *window) 230b25b33acSSukadev Bhattiprolu { 231b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LPID), 0ULL); 232b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(PID), 0ULL); 233b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(XLATE_MSR), 0ULL); 234b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(XLATE_LPCR), 0ULL); 235b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(XLATE_CTL), 0ULL); 236b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(AMR), 0ULL); 237b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(SEIDR), 0ULL); 238b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(FAULT_TX_WIN), 0ULL); 239b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(OSU_INTR_SRC_RA), 0ULL); 240b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(HV_INTR_SRC_RA), 0ULL); 241b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(PSWID), 0ULL); 242b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LFIFO_BAR), 0ULL); 243b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LDATA_STAMP_CTL), 0ULL); 244b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LDMA_CACHE_CTL), 0ULL); 245b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LRFIFO_PUSH), 0ULL); 246b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(CURR_MSG_COUNT), 0ULL); 247b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_AFTER_COUNT), 0ULL); 248b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LRX_WCRED), 0ULL); 249b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LRX_WCRED_ADDER), 0ULL); 250b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(TX_WCRED), 0ULL); 251b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(TX_WCRED_ADDER), 0ULL); 252b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LFIFO_SIZE), 0ULL); 253b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(WINCTL), 0ULL); 254b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(WIN_STATUS), 0ULL); 255b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(WIN_CTX_CACHING_CTL), 0ULL); 256b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(TX_RSVD_BUF_COUNT), 0ULL); 257b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LRFIFO_WIN_PTR), 0ULL); 258b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_CTL), 0ULL); 259b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_PID), 0ULL); 260b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_LPID), 0ULL); 261b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_TID), 0ULL); 262b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_SCOPE), 0ULL); 263b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(NX_UTIL_ADDER), 0ULL); 264b25b33acSSukadev Bhattiprolu 265b25b33acSSukadev Bhattiprolu /* Skip read-only registers: NX_UTIL and NX_UTIL_SE */ 266b25b33acSSukadev Bhattiprolu 267b25b33acSSukadev Bhattiprolu /* 268b25b33acSSukadev Bhattiprolu * The send and receive window credit adder registers are also 269b25b33acSSukadev Bhattiprolu * accessible from HVWC and have been initialized above. We don't 270b25b33acSSukadev Bhattiprolu * need to initialize from the OS/User Window Context, so skip 271b25b33acSSukadev Bhattiprolu * following calls: 272b25b33acSSukadev Bhattiprolu * 273b25b33acSSukadev Bhattiprolu * write_uwc_reg(window, VREG(TX_WCRED_ADDER), 0ULL); 274b25b33acSSukadev Bhattiprolu * write_uwc_reg(window, VREG(LRX_WCRED_ADDER), 0ULL); 275b25b33acSSukadev Bhattiprolu */ 276b25b33acSSukadev Bhattiprolu } 277b25b33acSSukadev Bhattiprolu 278b25b33acSSukadev Bhattiprolu /* 279b25b33acSSukadev Bhattiprolu * Initialize window context registers related to Address Translation. 280b25b33acSSukadev Bhattiprolu * These registers are common to send/receive windows although they 281b25b33acSSukadev Bhattiprolu * differ for user/kernel windows. As we resolve the TODOs we may 282b25b33acSSukadev Bhattiprolu * want to add fields to vas_winctx and move the initialization to 283b25b33acSSukadev Bhattiprolu * init_vas_winctx_regs(). 284b25b33acSSukadev Bhattiprolu */ 285b25b33acSSukadev Bhattiprolu static void init_xlate_regs(struct vas_window *window, bool user_win) 286b25b33acSSukadev Bhattiprolu { 287b25b33acSSukadev Bhattiprolu u64 lpcr, val; 288b25b33acSSukadev Bhattiprolu 289b25b33acSSukadev Bhattiprolu /* 290b25b33acSSukadev Bhattiprolu * MSR_TA, MSR_US are false for both kernel and user. 291b25b33acSSukadev Bhattiprolu * MSR_DR and MSR_PR are false for kernel. 292b25b33acSSukadev Bhattiprolu */ 293b25b33acSSukadev Bhattiprolu val = 0ULL; 294b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_XLATE_MSR_HV, val, 1); 295b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_XLATE_MSR_SF, val, 1); 296b25b33acSSukadev Bhattiprolu if (user_win) { 297b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_XLATE_MSR_DR, val, 1); 298b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_XLATE_MSR_PR, val, 1); 299b25b33acSSukadev Bhattiprolu } 300b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(XLATE_MSR), val); 301b25b33acSSukadev Bhattiprolu 302b25b33acSSukadev Bhattiprolu lpcr = mfspr(SPRN_LPCR); 303b25b33acSSukadev Bhattiprolu val = 0ULL; 304b25b33acSSukadev Bhattiprolu /* 305b25b33acSSukadev Bhattiprolu * NOTE: From Section 5.7.8.1 Segment Lookaside Buffer of the 306b25b33acSSukadev Bhattiprolu * Power ISA, v3.0B, Page size encoding is 0 = 4KB, 5 = 64KB. 307b25b33acSSukadev Bhattiprolu * 308b25b33acSSukadev Bhattiprolu * NOTE: From Section 1.3.1, Address Translation Context of the 309b25b33acSSukadev Bhattiprolu * Nest MMU Workbook, LPCR_SC should be 0 for Power9. 310b25b33acSSukadev Bhattiprolu */ 311b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_XLATE_LPCR_PAGE_SIZE, val, 5); 312b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_XLATE_LPCR_ISL, val, lpcr & LPCR_ISL); 313b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_XLATE_LPCR_TC, val, lpcr & LPCR_TC); 314b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_XLATE_LPCR_SC, val, 0); 315b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(XLATE_LPCR), val); 316b25b33acSSukadev Bhattiprolu 317b25b33acSSukadev Bhattiprolu /* 318b25b33acSSukadev Bhattiprolu * Section 1.3.1 (Address translation Context) of NMMU workbook. 319b25b33acSSukadev Bhattiprolu * 0b00 Hashed Page Table mode 320b25b33acSSukadev Bhattiprolu * 0b01 Reserved 321b25b33acSSukadev Bhattiprolu * 0b10 Radix on HPT 322b25b33acSSukadev Bhattiprolu * 0b11 Radix on Radix 323b25b33acSSukadev Bhattiprolu */ 324b25b33acSSukadev Bhattiprolu val = 0ULL; 325b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_XLATE_MODE, val, radix_enabled() ? 3 : 2); 326b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(XLATE_CTL), val); 327b25b33acSSukadev Bhattiprolu 328b25b33acSSukadev Bhattiprolu /* 329b25b33acSSukadev Bhattiprolu * TODO: Can we mfspr(AMR) even for user windows? 330b25b33acSSukadev Bhattiprolu */ 331b25b33acSSukadev Bhattiprolu val = 0ULL; 332b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_AMR, val, mfspr(SPRN_AMR)); 333b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(AMR), val); 334b25b33acSSukadev Bhattiprolu 335b25b33acSSukadev Bhattiprolu val = 0ULL; 336b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_SEIDR, val, 0); 337b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(SEIDR), val); 338b25b33acSSukadev Bhattiprolu } 339b25b33acSSukadev Bhattiprolu 340b25b33acSSukadev Bhattiprolu /* 341b25b33acSSukadev Bhattiprolu * Initialize Reserved Send Buffer Count for the send window. It involves 342b25b33acSSukadev Bhattiprolu * writing to the register, reading it back to confirm that the hardware 343b25b33acSSukadev Bhattiprolu * has enough buffers to reserve. See section 1.3.1.2.1 of VAS workbook. 344b25b33acSSukadev Bhattiprolu * 345b25b33acSSukadev Bhattiprolu * Since we can only make a best-effort attempt to fulfill the request, 346b25b33acSSukadev Bhattiprolu * we don't return any errors if we cannot. 347b25b33acSSukadev Bhattiprolu * 348b25b33acSSukadev Bhattiprolu * TODO: Reserved (aka dedicated) send buffers are not supported yet. 349b25b33acSSukadev Bhattiprolu */ 350b25b33acSSukadev Bhattiprolu static void init_rsvd_tx_buf_count(struct vas_window *txwin, 351b25b33acSSukadev Bhattiprolu struct vas_winctx *winctx) 352b25b33acSSukadev Bhattiprolu { 353b25b33acSSukadev Bhattiprolu write_hvwc_reg(txwin, VREG(TX_RSVD_BUF_COUNT), 0ULL); 354b25b33acSSukadev Bhattiprolu } 355b25b33acSSukadev Bhattiprolu 356b25b33acSSukadev Bhattiprolu /* 357b25b33acSSukadev Bhattiprolu * init_winctx_regs() 358b25b33acSSukadev Bhattiprolu * Initialize window context registers for a receive window. 359b25b33acSSukadev Bhattiprolu * Except for caching control and marking window open, the registers 360b25b33acSSukadev Bhattiprolu * are initialized in the order listed in Section 3.1.4 (Window Context 361b25b33acSSukadev Bhattiprolu * Cache Register Details) of the VAS workbook although they don't need 362b25b33acSSukadev Bhattiprolu * to be. 363b25b33acSSukadev Bhattiprolu * 364b25b33acSSukadev Bhattiprolu * Design note: For NX receive windows, NX allocates the FIFO buffer in OPAL 365b25b33acSSukadev Bhattiprolu * (so that it can get a large contiguous area) and passes that buffer 366b25b33acSSukadev Bhattiprolu * to kernel via device tree. We now write that buffer address to the 367b25b33acSSukadev Bhattiprolu * FIFO BAR. Would it make sense to do this all in OPAL? i.e have OPAL 368b25b33acSSukadev Bhattiprolu * write the per-chip RX FIFO addresses to the windows during boot-up 369b25b33acSSukadev Bhattiprolu * as a one-time task? That could work for NX but what about other 370b25b33acSSukadev Bhattiprolu * receivers? Let the receivers tell us the rx-fifo buffers for now. 371b25b33acSSukadev Bhattiprolu */ 372b25b33acSSukadev Bhattiprolu int init_winctx_regs(struct vas_window *window, struct vas_winctx *winctx) 373b25b33acSSukadev Bhattiprolu { 374b25b33acSSukadev Bhattiprolu u64 val; 375b25b33acSSukadev Bhattiprolu int fifo_size; 376b25b33acSSukadev Bhattiprolu 377b25b33acSSukadev Bhattiprolu reset_window_regs(window); 378b25b33acSSukadev Bhattiprolu 379b25b33acSSukadev Bhattiprolu val = 0ULL; 380b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LPID, val, winctx->lpid); 381b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LPID), val); 382b25b33acSSukadev Bhattiprolu 383b25b33acSSukadev Bhattiprolu val = 0ULL; 384b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_PID_ID, val, winctx->pidr); 385b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(PID), val); 386b25b33acSSukadev Bhattiprolu 387b25b33acSSukadev Bhattiprolu init_xlate_regs(window, winctx->user_win); 388b25b33acSSukadev Bhattiprolu 389b25b33acSSukadev Bhattiprolu val = 0ULL; 390b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_FAULT_TX_WIN, val, 0); 391b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(FAULT_TX_WIN), val); 392b25b33acSSukadev Bhattiprolu 393b25b33acSSukadev Bhattiprolu /* In PowerNV, interrupts go to HV. */ 394b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(OSU_INTR_SRC_RA), 0ULL); 395b25b33acSSukadev Bhattiprolu 396b25b33acSSukadev Bhattiprolu val = 0ULL; 397b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_HV_INTR_SRC_RA, val, winctx->irq_port); 398b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(HV_INTR_SRC_RA), val); 399b25b33acSSukadev Bhattiprolu 400b25b33acSSukadev Bhattiprolu val = 0ULL; 401b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_PSWID_EA_HANDLE, val, winctx->pswid); 402b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(PSWID), val); 403b25b33acSSukadev Bhattiprolu 404b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(SPARE1), 0ULL); 405b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(SPARE2), 0ULL); 406b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(SPARE3), 0ULL); 407b25b33acSSukadev Bhattiprolu 408b25b33acSSukadev Bhattiprolu /* 409b25b33acSSukadev Bhattiprolu * NOTE: VAS expects the FIFO address to be copied into the LFIFO_BAR 410b25b33acSSukadev Bhattiprolu * register as is - do NOT shift the address into VAS_LFIFO_BAR 411b25b33acSSukadev Bhattiprolu * bit fields! Ok to set the page migration select fields - 412b25b33acSSukadev Bhattiprolu * VAS ignores the lower 10+ bits in the address anyway, because 413b25b33acSSukadev Bhattiprolu * the minimum FIFO size is 1K? 414b25b33acSSukadev Bhattiprolu * 415b25b33acSSukadev Bhattiprolu * See also: Design note in function header. 416b25b33acSSukadev Bhattiprolu */ 417b25b33acSSukadev Bhattiprolu val = __pa(winctx->rx_fifo); 418b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_PAGE_MIGRATION_SELECT, val, 0); 419b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LFIFO_BAR), val); 420b25b33acSSukadev Bhattiprolu 421b25b33acSSukadev Bhattiprolu val = 0ULL; 422b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LDATA_STAMP, val, winctx->data_stamp); 423b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LDATA_STAMP_CTL), val); 424b25b33acSSukadev Bhattiprolu 425b25b33acSSukadev Bhattiprolu val = 0ULL; 426b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LDMA_TYPE, val, winctx->dma_type); 427b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LDMA_FIFO_DISABLE, val, winctx->fifo_disable); 428b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LDMA_CACHE_CTL), val); 429b25b33acSSukadev Bhattiprolu 430b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LRFIFO_PUSH), 0ULL); 431b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(CURR_MSG_COUNT), 0ULL); 432b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_AFTER_COUNT), 0ULL); 433b25b33acSSukadev Bhattiprolu 434b25b33acSSukadev Bhattiprolu val = 0ULL; 435b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LRX_WCRED, val, winctx->wcreds_max); 436b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LRX_WCRED), val); 437b25b33acSSukadev Bhattiprolu 438b25b33acSSukadev Bhattiprolu val = 0ULL; 439b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_TX_WCRED, val, winctx->wcreds_max); 440b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(TX_WCRED), val); 441b25b33acSSukadev Bhattiprolu 442b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LRX_WCRED_ADDER), 0ULL); 443b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(TX_WCRED_ADDER), 0ULL); 444b25b33acSSukadev Bhattiprolu 445b25b33acSSukadev Bhattiprolu fifo_size = winctx->rx_fifo_size / 1024; 446b25b33acSSukadev Bhattiprolu 447b25b33acSSukadev Bhattiprolu val = 0ULL; 448b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LFIFO_SIZE, val, ilog2(fifo_size)); 449b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LFIFO_SIZE), val); 450b25b33acSSukadev Bhattiprolu 451b25b33acSSukadev Bhattiprolu /* Update window control and caching control registers last so 452b25b33acSSukadev Bhattiprolu * we mark the window open only after fully initializing it and 453b25b33acSSukadev Bhattiprolu * pushing context to cache. 454b25b33acSSukadev Bhattiprolu */ 455b25b33acSSukadev Bhattiprolu 456b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(WIN_STATUS), 0ULL); 457b25b33acSSukadev Bhattiprolu 458b25b33acSSukadev Bhattiprolu init_rsvd_tx_buf_count(window, winctx); 459b25b33acSSukadev Bhattiprolu 460b25b33acSSukadev Bhattiprolu /* for a send window, point to the matching receive window */ 461b25b33acSSukadev Bhattiprolu val = 0ULL; 462b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LRX_WIN_ID, val, winctx->rx_win_id); 463b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LRFIFO_WIN_PTR), val); 464b25b33acSSukadev Bhattiprolu 465b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(SPARE4), 0ULL); 466b25b33acSSukadev Bhattiprolu 467b25b33acSSukadev Bhattiprolu val = 0ULL; 468b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_NOTIFY_DISABLE, val, winctx->notify_disable); 469b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_INTR_DISABLE, val, winctx->intr_disable); 470b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_NOTIFY_EARLY, val, winctx->notify_early); 471b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_NOTIFY_OSU_INTR, val, winctx->notify_os_intr_reg); 472b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_CTL), val); 473b25b33acSSukadev Bhattiprolu 474b25b33acSSukadev Bhattiprolu val = 0ULL; 475b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LNOTIFY_PID, val, winctx->lnotify_pid); 476b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_PID), val); 477b25b33acSSukadev Bhattiprolu 478b25b33acSSukadev Bhattiprolu val = 0ULL; 479b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LNOTIFY_LPID, val, winctx->lnotify_lpid); 480b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_LPID), val); 481b25b33acSSukadev Bhattiprolu 482b25b33acSSukadev Bhattiprolu val = 0ULL; 483b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LNOTIFY_TID, val, winctx->lnotify_tid); 484b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_TID), val); 485b25b33acSSukadev Bhattiprolu 486b25b33acSSukadev Bhattiprolu val = 0ULL; 487b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LNOTIFY_MIN_SCOPE, val, winctx->min_scope); 488b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LNOTIFY_MAX_SCOPE, val, winctx->max_scope); 489b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_SCOPE), val); 490b25b33acSSukadev Bhattiprolu 491b25b33acSSukadev Bhattiprolu /* Skip read-only registers NX_UTIL and NX_UTIL_SE */ 492b25b33acSSukadev Bhattiprolu 493b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(SPARE5), 0ULL); 494b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(NX_UTIL_ADDER), 0ULL); 495b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(SPARE6), 0ULL); 496b25b33acSSukadev Bhattiprolu 497b25b33acSSukadev Bhattiprolu /* Finally, push window context to memory and... */ 498b25b33acSSukadev Bhattiprolu val = 0ULL; 499b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_PUSH_TO_MEM, val, 1); 500b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(WIN_CTX_CACHING_CTL), val); 501b25b33acSSukadev Bhattiprolu 502b25b33acSSukadev Bhattiprolu /* ... mark the window open for business */ 503b25b33acSSukadev Bhattiprolu val = 0ULL; 504b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_REJ_NO_CREDIT, val, winctx->rej_no_credit); 505b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_PIN, val, winctx->pin_win); 506b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_TX_WCRED_MODE, val, winctx->tx_wcred_mode); 507b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_RX_WCRED_MODE, val, winctx->rx_wcred_mode); 508b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_TX_WORD_MODE, val, winctx->tx_word_mode); 509b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_RX_WORD_MODE, val, winctx->rx_word_mode); 510b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_FAULT_WIN, val, winctx->fault_win); 511b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_NX_WIN, val, winctx->nx_win); 512b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_OPEN, val, 1); 513b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(WINCTL), val); 514b25b33acSSukadev Bhattiprolu 515b25b33acSSukadev Bhattiprolu return 0; 516b25b33acSSukadev Bhattiprolu } 517b25b33acSSukadev Bhattiprolu 518bbfe59f8SSukadev Bhattiprolu static DEFINE_SPINLOCK(vas_ida_lock); 519bbfe59f8SSukadev Bhattiprolu 520bbfe59f8SSukadev Bhattiprolu static void vas_release_window_id(struct ida *ida, int winid) 521bbfe59f8SSukadev Bhattiprolu { 522bbfe59f8SSukadev Bhattiprolu spin_lock(&vas_ida_lock); 523bbfe59f8SSukadev Bhattiprolu ida_remove(ida, winid); 524bbfe59f8SSukadev Bhattiprolu spin_unlock(&vas_ida_lock); 525bbfe59f8SSukadev Bhattiprolu } 526bbfe59f8SSukadev Bhattiprolu 527bbfe59f8SSukadev Bhattiprolu static int vas_assign_window_id(struct ida *ida) 528bbfe59f8SSukadev Bhattiprolu { 529bbfe59f8SSukadev Bhattiprolu int rc, winid; 530bbfe59f8SSukadev Bhattiprolu 531bbfe59f8SSukadev Bhattiprolu do { 532bbfe59f8SSukadev Bhattiprolu rc = ida_pre_get(ida, GFP_KERNEL); 533bbfe59f8SSukadev Bhattiprolu if (!rc) 534bbfe59f8SSukadev Bhattiprolu return -EAGAIN; 535bbfe59f8SSukadev Bhattiprolu 536bbfe59f8SSukadev Bhattiprolu spin_lock(&vas_ida_lock); 537bbfe59f8SSukadev Bhattiprolu rc = ida_get_new(ida, &winid); 538bbfe59f8SSukadev Bhattiprolu spin_unlock(&vas_ida_lock); 539bbfe59f8SSukadev Bhattiprolu } while (rc == -EAGAIN); 540bbfe59f8SSukadev Bhattiprolu 541bbfe59f8SSukadev Bhattiprolu if (rc) 542bbfe59f8SSukadev Bhattiprolu return rc; 543bbfe59f8SSukadev Bhattiprolu 544bbfe59f8SSukadev Bhattiprolu if (winid > VAS_WINDOWS_PER_CHIP) { 545bbfe59f8SSukadev Bhattiprolu pr_err("Too many (%d) open windows\n", winid); 546bbfe59f8SSukadev Bhattiprolu vas_release_window_id(ida, winid); 547bbfe59f8SSukadev Bhattiprolu return -EAGAIN; 548bbfe59f8SSukadev Bhattiprolu } 549bbfe59f8SSukadev Bhattiprolu 550bbfe59f8SSukadev Bhattiprolu return winid; 551bbfe59f8SSukadev Bhattiprolu } 552bbfe59f8SSukadev Bhattiprolu 55398271d41SSukadev Bhattiprolu static void vas_window_free(struct vas_window *window) 554bbfe59f8SSukadev Bhattiprolu { 555bbfe59f8SSukadev Bhattiprolu int winid = window->winid; 556bbfe59f8SSukadev Bhattiprolu struct vas_instance *vinst = window->vinst; 557bbfe59f8SSukadev Bhattiprolu 558bbfe59f8SSukadev Bhattiprolu unmap_winctx_mmio_bars(window); 559ece4e512SSukadev Bhattiprolu 560ece4e512SSukadev Bhattiprolu vas_window_free_dbgdir(window); 561ece4e512SSukadev Bhattiprolu 562bbfe59f8SSukadev Bhattiprolu kfree(window); 563bbfe59f8SSukadev Bhattiprolu 564bbfe59f8SSukadev Bhattiprolu vas_release_window_id(&vinst->ida, winid); 565bbfe59f8SSukadev Bhattiprolu } 566bbfe59f8SSukadev Bhattiprolu 56762c4eda4SSukadev Bhattiprolu static struct vas_window *vas_window_alloc(struct vas_instance *vinst) 568bbfe59f8SSukadev Bhattiprolu { 569bbfe59f8SSukadev Bhattiprolu int winid; 570bbfe59f8SSukadev Bhattiprolu struct vas_window *window; 571bbfe59f8SSukadev Bhattiprolu 572bbfe59f8SSukadev Bhattiprolu winid = vas_assign_window_id(&vinst->ida); 573bbfe59f8SSukadev Bhattiprolu if (winid < 0) 574bbfe59f8SSukadev Bhattiprolu return ERR_PTR(winid); 575bbfe59f8SSukadev Bhattiprolu 576bbfe59f8SSukadev Bhattiprolu window = kzalloc(sizeof(*window), GFP_KERNEL); 577bbfe59f8SSukadev Bhattiprolu if (!window) 578bbfe59f8SSukadev Bhattiprolu goto out_free; 579bbfe59f8SSukadev Bhattiprolu 580bbfe59f8SSukadev Bhattiprolu window->vinst = vinst; 581bbfe59f8SSukadev Bhattiprolu window->winid = winid; 582bbfe59f8SSukadev Bhattiprolu 583bbfe59f8SSukadev Bhattiprolu if (map_winctx_mmio_bars(window)) 584bbfe59f8SSukadev Bhattiprolu goto out_free; 585bbfe59f8SSukadev Bhattiprolu 586ece4e512SSukadev Bhattiprolu vas_window_init_dbgdir(window); 587ece4e512SSukadev Bhattiprolu 588bbfe59f8SSukadev Bhattiprolu return window; 589bbfe59f8SSukadev Bhattiprolu 590bbfe59f8SSukadev Bhattiprolu out_free: 591bbfe59f8SSukadev Bhattiprolu kfree(window); 592bbfe59f8SSukadev Bhattiprolu vas_release_window_id(&vinst->ida, winid); 593bbfe59f8SSukadev Bhattiprolu return ERR_PTR(-ENOMEM); 594bbfe59f8SSukadev Bhattiprolu } 595bbfe59f8SSukadev Bhattiprolu 59698271d41SSukadev Bhattiprolu static void put_rx_win(struct vas_window *rxwin) 59798271d41SSukadev Bhattiprolu { 59898271d41SSukadev Bhattiprolu /* Better not be a send window! */ 59998271d41SSukadev Bhattiprolu WARN_ON_ONCE(rxwin->tx_win); 60098271d41SSukadev Bhattiprolu 60198271d41SSukadev Bhattiprolu atomic_dec(&rxwin->num_txwins); 60298271d41SSukadev Bhattiprolu } 60398271d41SSukadev Bhattiprolu 60462c4eda4SSukadev Bhattiprolu /* 6056c8e6bb2SSukadev Bhattiprolu * Find the user space receive window given the @pswid. 6066c8e6bb2SSukadev Bhattiprolu * - We must have a valid vasid and it must belong to this instance. 6076c8e6bb2SSukadev Bhattiprolu * (so both send and receive windows are on the same VAS instance) 6086c8e6bb2SSukadev Bhattiprolu * - The window must refer to an OPEN, FTW, RECEIVE window. 6096c8e6bb2SSukadev Bhattiprolu * 6106c8e6bb2SSukadev Bhattiprolu * NOTE: We access ->windows[] table and assume that vinst->mutex is held. 6116c8e6bb2SSukadev Bhattiprolu */ 6126c8e6bb2SSukadev Bhattiprolu static struct vas_window *get_user_rxwin(struct vas_instance *vinst, u32 pswid) 6136c8e6bb2SSukadev Bhattiprolu { 6146c8e6bb2SSukadev Bhattiprolu int vasid, winid; 6156c8e6bb2SSukadev Bhattiprolu struct vas_window *rxwin; 6166c8e6bb2SSukadev Bhattiprolu 6176c8e6bb2SSukadev Bhattiprolu decode_pswid(pswid, &vasid, &winid); 6186c8e6bb2SSukadev Bhattiprolu 6196c8e6bb2SSukadev Bhattiprolu if (vinst->vas_id != vasid) 6206c8e6bb2SSukadev Bhattiprolu return ERR_PTR(-EINVAL); 6216c8e6bb2SSukadev Bhattiprolu 6226c8e6bb2SSukadev Bhattiprolu rxwin = vinst->windows[winid]; 6236c8e6bb2SSukadev Bhattiprolu 6246c8e6bb2SSukadev Bhattiprolu if (!rxwin || rxwin->tx_win || rxwin->cop != VAS_COP_TYPE_FTW) 6256c8e6bb2SSukadev Bhattiprolu return ERR_PTR(-EINVAL); 6266c8e6bb2SSukadev Bhattiprolu 6276c8e6bb2SSukadev Bhattiprolu return rxwin; 6286c8e6bb2SSukadev Bhattiprolu } 6296c8e6bb2SSukadev Bhattiprolu 6306c8e6bb2SSukadev Bhattiprolu /* 63162c4eda4SSukadev Bhattiprolu * Get the VAS receive window associated with NX engine identified 63262c4eda4SSukadev Bhattiprolu * by @cop and if applicable, @pswid. 63362c4eda4SSukadev Bhattiprolu * 63462c4eda4SSukadev Bhattiprolu * See also function header of set_vinst_win(). 63562c4eda4SSukadev Bhattiprolu */ 6365239af67SSukadev Bhattiprolu static struct vas_window *get_vinst_rxwin(struct vas_instance *vinst, 63762c4eda4SSukadev Bhattiprolu enum vas_cop_type cop, u32 pswid) 63862c4eda4SSukadev Bhattiprolu { 63962c4eda4SSukadev Bhattiprolu struct vas_window *rxwin; 64062c4eda4SSukadev Bhattiprolu 64162c4eda4SSukadev Bhattiprolu mutex_lock(&vinst->mutex); 64262c4eda4SSukadev Bhattiprolu 6436c8e6bb2SSukadev Bhattiprolu if (cop == VAS_COP_TYPE_FTW) 6446c8e6bb2SSukadev Bhattiprolu rxwin = get_user_rxwin(vinst, pswid); 64562c4eda4SSukadev Bhattiprolu else 6466c8e6bb2SSukadev Bhattiprolu rxwin = vinst->rxwin[cop] ?: ERR_PTR(-EINVAL); 64762c4eda4SSukadev Bhattiprolu 64862c4eda4SSukadev Bhattiprolu if (!IS_ERR(rxwin)) 64962c4eda4SSukadev Bhattiprolu atomic_inc(&rxwin->num_txwins); 65062c4eda4SSukadev Bhattiprolu 65162c4eda4SSukadev Bhattiprolu mutex_unlock(&vinst->mutex); 65262c4eda4SSukadev Bhattiprolu 65362c4eda4SSukadev Bhattiprolu return rxwin; 65462c4eda4SSukadev Bhattiprolu } 65562c4eda4SSukadev Bhattiprolu 65662c4eda4SSukadev Bhattiprolu /* 65762c4eda4SSukadev Bhattiprolu * We have two tables of windows in a VAS instance. The first one, 65862c4eda4SSukadev Bhattiprolu * ->windows[], contains all the windows in the instance and allows 65962c4eda4SSukadev Bhattiprolu * looking up a window by its id. It is used to look up send windows 66062c4eda4SSukadev Bhattiprolu * during fault handling and receive windows when pairing user space 66162c4eda4SSukadev Bhattiprolu * send/receive windows. 66262c4eda4SSukadev Bhattiprolu * 66362c4eda4SSukadev Bhattiprolu * The second table, ->rxwin[], contains receive windows that are 66462c4eda4SSukadev Bhattiprolu * associated with NX engines. This table has VAS_COP_TYPE_MAX 66562c4eda4SSukadev Bhattiprolu * entries and is used to look up a receive window by its 66662c4eda4SSukadev Bhattiprolu * coprocessor type. 66762c4eda4SSukadev Bhattiprolu * 66862c4eda4SSukadev Bhattiprolu * Here, we save @window in the ->windows[] table. If it is a receive 66962c4eda4SSukadev Bhattiprolu * window, we also save the window in the ->rxwin[] table. 67062c4eda4SSukadev Bhattiprolu */ 67162c4eda4SSukadev Bhattiprolu static void set_vinst_win(struct vas_instance *vinst, 67262c4eda4SSukadev Bhattiprolu struct vas_window *window) 67362c4eda4SSukadev Bhattiprolu { 67462c4eda4SSukadev Bhattiprolu int id = window->winid; 67562c4eda4SSukadev Bhattiprolu 67662c4eda4SSukadev Bhattiprolu mutex_lock(&vinst->mutex); 67762c4eda4SSukadev Bhattiprolu 67862c4eda4SSukadev Bhattiprolu /* 67962c4eda4SSukadev Bhattiprolu * There should only be one receive window for a coprocessor type 68062c4eda4SSukadev Bhattiprolu * unless its a user (FTW) window. 68162c4eda4SSukadev Bhattiprolu */ 68262c4eda4SSukadev Bhattiprolu if (!window->user_win && !window->tx_win) { 68362c4eda4SSukadev Bhattiprolu WARN_ON_ONCE(vinst->rxwin[window->cop]); 68462c4eda4SSukadev Bhattiprolu vinst->rxwin[window->cop] = window; 68562c4eda4SSukadev Bhattiprolu } 68662c4eda4SSukadev Bhattiprolu 68762c4eda4SSukadev Bhattiprolu WARN_ON_ONCE(vinst->windows[id] != NULL); 68862c4eda4SSukadev Bhattiprolu vinst->windows[id] = window; 68962c4eda4SSukadev Bhattiprolu 69062c4eda4SSukadev Bhattiprolu mutex_unlock(&vinst->mutex); 69162c4eda4SSukadev Bhattiprolu } 69262c4eda4SSukadev Bhattiprolu 69362c4eda4SSukadev Bhattiprolu /* 69462c4eda4SSukadev Bhattiprolu * Clear this window from the table(s) of windows for this VAS instance. 69562c4eda4SSukadev Bhattiprolu * See also function header of set_vinst_win(). 69662c4eda4SSukadev Bhattiprolu */ 69798271d41SSukadev Bhattiprolu static void clear_vinst_win(struct vas_window *window) 69862c4eda4SSukadev Bhattiprolu { 69962c4eda4SSukadev Bhattiprolu int id = window->winid; 70062c4eda4SSukadev Bhattiprolu struct vas_instance *vinst = window->vinst; 70162c4eda4SSukadev Bhattiprolu 70262c4eda4SSukadev Bhattiprolu mutex_lock(&vinst->mutex); 70362c4eda4SSukadev Bhattiprolu 70462c4eda4SSukadev Bhattiprolu if (!window->user_win && !window->tx_win) { 70562c4eda4SSukadev Bhattiprolu WARN_ON_ONCE(!vinst->rxwin[window->cop]); 70662c4eda4SSukadev Bhattiprolu vinst->rxwin[window->cop] = NULL; 70762c4eda4SSukadev Bhattiprolu } 70862c4eda4SSukadev Bhattiprolu 70962c4eda4SSukadev Bhattiprolu WARN_ON_ONCE(vinst->windows[id] != window); 71062c4eda4SSukadev Bhattiprolu vinst->windows[id] = NULL; 71162c4eda4SSukadev Bhattiprolu 71262c4eda4SSukadev Bhattiprolu mutex_unlock(&vinst->mutex); 71362c4eda4SSukadev Bhattiprolu } 71462c4eda4SSukadev Bhattiprolu 71562c4eda4SSukadev Bhattiprolu static void init_winctx_for_rxwin(struct vas_window *rxwin, 71662c4eda4SSukadev Bhattiprolu struct vas_rx_win_attr *rxattr, 71762c4eda4SSukadev Bhattiprolu struct vas_winctx *winctx) 71862c4eda4SSukadev Bhattiprolu { 71962c4eda4SSukadev Bhattiprolu /* 72062c4eda4SSukadev Bhattiprolu * We first zero (memset()) all fields and only set non-zero fields. 72162c4eda4SSukadev Bhattiprolu * Following fields are 0/false but maybe deserve a comment: 72262c4eda4SSukadev Bhattiprolu * 72362c4eda4SSukadev Bhattiprolu * ->notify_os_intr_reg In powerNV, send intrs to HV 72462c4eda4SSukadev Bhattiprolu * ->notify_disable False for NX windows 72562c4eda4SSukadev Bhattiprolu * ->intr_disable False for Fault Windows 72662c4eda4SSukadev Bhattiprolu * ->xtra_write False for NX windows 72762c4eda4SSukadev Bhattiprolu * ->notify_early NA for NX windows 72862c4eda4SSukadev Bhattiprolu * ->rsvd_txbuf_count NA for Rx windows 72962c4eda4SSukadev Bhattiprolu * ->lpid, ->pid, ->tid NA for Rx windows 73062c4eda4SSukadev Bhattiprolu */ 73162c4eda4SSukadev Bhattiprolu 73262c4eda4SSukadev Bhattiprolu memset(winctx, 0, sizeof(struct vas_winctx)); 73362c4eda4SSukadev Bhattiprolu 73462c4eda4SSukadev Bhattiprolu winctx->rx_fifo = rxattr->rx_fifo; 73562c4eda4SSukadev Bhattiprolu winctx->rx_fifo_size = rxattr->rx_fifo_size; 73662f659e0SSukadev Bhattiprolu winctx->wcreds_max = rxwin->wcreds_max; 73762c4eda4SSukadev Bhattiprolu winctx->pin_win = rxattr->pin_win; 73862c4eda4SSukadev Bhattiprolu 73962c4eda4SSukadev Bhattiprolu winctx->nx_win = rxattr->nx_win; 74062c4eda4SSukadev Bhattiprolu winctx->fault_win = rxattr->fault_win; 741e34917fbSSukadev Bhattiprolu winctx->user_win = rxattr->user_win; 742e34917fbSSukadev Bhattiprolu winctx->rej_no_credit = rxattr->rej_no_credit; 74362c4eda4SSukadev Bhattiprolu winctx->rx_word_mode = rxattr->rx_win_ord_mode; 74462c4eda4SSukadev Bhattiprolu winctx->tx_word_mode = rxattr->tx_win_ord_mode; 74562c4eda4SSukadev Bhattiprolu winctx->rx_wcred_mode = rxattr->rx_wcred_mode; 74662c4eda4SSukadev Bhattiprolu winctx->tx_wcred_mode = rxattr->tx_wcred_mode; 747e34917fbSSukadev Bhattiprolu winctx->notify_early = rxattr->notify_early; 74862c4eda4SSukadev Bhattiprolu 74962c4eda4SSukadev Bhattiprolu if (winctx->nx_win) { 75062c4eda4SSukadev Bhattiprolu winctx->data_stamp = true; 75162c4eda4SSukadev Bhattiprolu winctx->intr_disable = true; 75262c4eda4SSukadev Bhattiprolu winctx->pin_win = true; 75362c4eda4SSukadev Bhattiprolu 75462c4eda4SSukadev Bhattiprolu WARN_ON_ONCE(winctx->fault_win); 75562c4eda4SSukadev Bhattiprolu WARN_ON_ONCE(!winctx->rx_word_mode); 75662c4eda4SSukadev Bhattiprolu WARN_ON_ONCE(!winctx->tx_word_mode); 75762c4eda4SSukadev Bhattiprolu WARN_ON_ONCE(winctx->notify_after_count); 75862c4eda4SSukadev Bhattiprolu } else if (winctx->fault_win) { 75962c4eda4SSukadev Bhattiprolu winctx->notify_disable = true; 76062c4eda4SSukadev Bhattiprolu } else if (winctx->user_win) { 76162c4eda4SSukadev Bhattiprolu /* 76262c4eda4SSukadev Bhattiprolu * Section 1.8.1 Low Latency Core-Core Wake up of 76362c4eda4SSukadev Bhattiprolu * the VAS workbook: 76462c4eda4SSukadev Bhattiprolu * 76562c4eda4SSukadev Bhattiprolu * - disable credit checks ([tr]x_wcred_mode = false) 76662c4eda4SSukadev Bhattiprolu * - disable FIFO writes 76762c4eda4SSukadev Bhattiprolu * - enable ASB_Notify, disable interrupt 76862c4eda4SSukadev Bhattiprolu */ 76962c4eda4SSukadev Bhattiprolu winctx->fifo_disable = true; 77062c4eda4SSukadev Bhattiprolu winctx->intr_disable = true; 77162c4eda4SSukadev Bhattiprolu winctx->rx_fifo = NULL; 77262c4eda4SSukadev Bhattiprolu } 77362c4eda4SSukadev Bhattiprolu 77462c4eda4SSukadev Bhattiprolu winctx->lnotify_lpid = rxattr->lnotify_lpid; 77562c4eda4SSukadev Bhattiprolu winctx->lnotify_pid = rxattr->lnotify_pid; 77662c4eda4SSukadev Bhattiprolu winctx->lnotify_tid = rxattr->lnotify_tid; 77762c4eda4SSukadev Bhattiprolu winctx->pswid = rxattr->pswid; 77862c4eda4SSukadev Bhattiprolu winctx->dma_type = VAS_DMA_TYPE_INJECT; 77962c4eda4SSukadev Bhattiprolu winctx->tc_mode = rxattr->tc_mode; 78062c4eda4SSukadev Bhattiprolu 78162c4eda4SSukadev Bhattiprolu winctx->min_scope = VAS_SCOPE_LOCAL; 78262c4eda4SSukadev Bhattiprolu winctx->max_scope = VAS_SCOPE_VECTORED_GROUP; 78362c4eda4SSukadev Bhattiprolu } 78462c4eda4SSukadev Bhattiprolu 78562c4eda4SSukadev Bhattiprolu static bool rx_win_args_valid(enum vas_cop_type cop, 78662c4eda4SSukadev Bhattiprolu struct vas_rx_win_attr *attr) 78762c4eda4SSukadev Bhattiprolu { 7880a2c2c24SSukadev Bhattiprolu pr_debug("Rxattr: fault %d, notify %d, intr %d, early %d, fifo %d\n", 7890a2c2c24SSukadev Bhattiprolu attr->fault_win, attr->notify_disable, 7900a2c2c24SSukadev Bhattiprolu attr->intr_disable, attr->notify_early, 7910a2c2c24SSukadev Bhattiprolu attr->rx_fifo_size); 79262c4eda4SSukadev Bhattiprolu 79362c4eda4SSukadev Bhattiprolu if (cop >= VAS_COP_TYPE_MAX) 79462c4eda4SSukadev Bhattiprolu return false; 79562c4eda4SSukadev Bhattiprolu 79662c4eda4SSukadev Bhattiprolu if (cop != VAS_COP_TYPE_FTW && 79762c4eda4SSukadev Bhattiprolu attr->rx_fifo_size < VAS_RX_FIFO_SIZE_MIN) 79862c4eda4SSukadev Bhattiprolu return false; 79962c4eda4SSukadev Bhattiprolu 80062c4eda4SSukadev Bhattiprolu if (attr->rx_fifo_size > VAS_RX_FIFO_SIZE_MAX) 80162c4eda4SSukadev Bhattiprolu return false; 80262c4eda4SSukadev Bhattiprolu 80351b53712SSukadev Bhattiprolu if (attr->wcreds_max > VAS_RX_WCREDS_MAX) 80451b53712SSukadev Bhattiprolu return false; 80551b53712SSukadev Bhattiprolu 80662c4eda4SSukadev Bhattiprolu if (attr->nx_win) { 80762c4eda4SSukadev Bhattiprolu /* cannot be fault or user window if it is nx */ 80862c4eda4SSukadev Bhattiprolu if (attr->fault_win || attr->user_win) 80962c4eda4SSukadev Bhattiprolu return false; 81062c4eda4SSukadev Bhattiprolu /* 81162c4eda4SSukadev Bhattiprolu * Section 3.1.4.32: NX Windows must not disable notification, 81262c4eda4SSukadev Bhattiprolu * and must not enable interrupts or early notification. 81362c4eda4SSukadev Bhattiprolu */ 81462c4eda4SSukadev Bhattiprolu if (attr->notify_disable || !attr->intr_disable || 81562c4eda4SSukadev Bhattiprolu attr->notify_early) 81662c4eda4SSukadev Bhattiprolu return false; 81762c4eda4SSukadev Bhattiprolu } else if (attr->fault_win) { 81862c4eda4SSukadev Bhattiprolu /* cannot be both fault and user window */ 81962c4eda4SSukadev Bhattiprolu if (attr->user_win) 82062c4eda4SSukadev Bhattiprolu return false; 82162c4eda4SSukadev Bhattiprolu 82262c4eda4SSukadev Bhattiprolu /* 82362c4eda4SSukadev Bhattiprolu * Section 3.1.4.32: Fault windows must disable notification 82462c4eda4SSukadev Bhattiprolu * but not interrupts. 82562c4eda4SSukadev Bhattiprolu */ 82662c4eda4SSukadev Bhattiprolu if (!attr->notify_disable || attr->intr_disable) 82762c4eda4SSukadev Bhattiprolu return false; 82862c4eda4SSukadev Bhattiprolu 82962c4eda4SSukadev Bhattiprolu } else if (attr->user_win) { 83062c4eda4SSukadev Bhattiprolu /* 83162c4eda4SSukadev Bhattiprolu * User receive windows are only for fast-thread-wakeup 83262c4eda4SSukadev Bhattiprolu * (FTW). They don't need a FIFO and must disable interrupts 83362c4eda4SSukadev Bhattiprolu */ 83462c4eda4SSukadev Bhattiprolu if (attr->rx_fifo || attr->rx_fifo_size || !attr->intr_disable) 83562c4eda4SSukadev Bhattiprolu return false; 83662c4eda4SSukadev Bhattiprolu } else { 83762c4eda4SSukadev Bhattiprolu /* Rx window must be one of NX or Fault or User window. */ 83862c4eda4SSukadev Bhattiprolu return false; 83962c4eda4SSukadev Bhattiprolu } 84062c4eda4SSukadev Bhattiprolu 84162c4eda4SSukadev Bhattiprolu return true; 84262c4eda4SSukadev Bhattiprolu } 84362c4eda4SSukadev Bhattiprolu 84462c4eda4SSukadev Bhattiprolu void vas_init_rx_win_attr(struct vas_rx_win_attr *rxattr, enum vas_cop_type cop) 84562c4eda4SSukadev Bhattiprolu { 84662c4eda4SSukadev Bhattiprolu memset(rxattr, 0, sizeof(*rxattr)); 84762c4eda4SSukadev Bhattiprolu 84862c4eda4SSukadev Bhattiprolu if (cop == VAS_COP_TYPE_842 || cop == VAS_COP_TYPE_842_HIPRI) { 84962c4eda4SSukadev Bhattiprolu rxattr->pin_win = true; 85062c4eda4SSukadev Bhattiprolu rxattr->nx_win = true; 85162c4eda4SSukadev Bhattiprolu rxattr->fault_win = false; 85262c4eda4SSukadev Bhattiprolu rxattr->intr_disable = true; 85362c4eda4SSukadev Bhattiprolu rxattr->rx_wcred_mode = true; 85462c4eda4SSukadev Bhattiprolu rxattr->tx_wcred_mode = true; 85562c4eda4SSukadev Bhattiprolu rxattr->rx_win_ord_mode = true; 85662c4eda4SSukadev Bhattiprolu rxattr->tx_win_ord_mode = true; 85762c4eda4SSukadev Bhattiprolu } else if (cop == VAS_COP_TYPE_FAULT) { 85862c4eda4SSukadev Bhattiprolu rxattr->pin_win = true; 85962c4eda4SSukadev Bhattiprolu rxattr->fault_win = true; 86062c4eda4SSukadev Bhattiprolu rxattr->notify_disable = true; 86162c4eda4SSukadev Bhattiprolu rxattr->rx_wcred_mode = true; 86262c4eda4SSukadev Bhattiprolu rxattr->tx_wcred_mode = true; 86362c4eda4SSukadev Bhattiprolu rxattr->rx_win_ord_mode = true; 86462c4eda4SSukadev Bhattiprolu rxattr->tx_win_ord_mode = true; 86562c4eda4SSukadev Bhattiprolu } else if (cop == VAS_COP_TYPE_FTW) { 86662c4eda4SSukadev Bhattiprolu rxattr->user_win = true; 86762c4eda4SSukadev Bhattiprolu rxattr->intr_disable = true; 86862c4eda4SSukadev Bhattiprolu 86962c4eda4SSukadev Bhattiprolu /* 87062c4eda4SSukadev Bhattiprolu * As noted in the VAS Workbook we disable credit checks. 87162c4eda4SSukadev Bhattiprolu * If we enable credit checks in the future, we must also 87262c4eda4SSukadev Bhattiprolu * implement a mechanism to return the user credits or new 87362c4eda4SSukadev Bhattiprolu * paste operations will fail. 87462c4eda4SSukadev Bhattiprolu */ 87562c4eda4SSukadev Bhattiprolu } 87662c4eda4SSukadev Bhattiprolu } 87762c4eda4SSukadev Bhattiprolu EXPORT_SYMBOL_GPL(vas_init_rx_win_attr); 87862c4eda4SSukadev Bhattiprolu 87962c4eda4SSukadev Bhattiprolu struct vas_window *vas_rx_win_open(int vasid, enum vas_cop_type cop, 88062c4eda4SSukadev Bhattiprolu struct vas_rx_win_attr *rxattr) 88162c4eda4SSukadev Bhattiprolu { 88262c4eda4SSukadev Bhattiprolu struct vas_window *rxwin; 88362c4eda4SSukadev Bhattiprolu struct vas_winctx winctx; 88462c4eda4SSukadev Bhattiprolu struct vas_instance *vinst; 88562c4eda4SSukadev Bhattiprolu 886007bb7d6SSukadev Bhattiprolu trace_vas_rx_win_open(current, vasid, cop, rxattr); 887007bb7d6SSukadev Bhattiprolu 88862c4eda4SSukadev Bhattiprolu if (!rx_win_args_valid(cop, rxattr)) 88962c4eda4SSukadev Bhattiprolu return ERR_PTR(-EINVAL); 89062c4eda4SSukadev Bhattiprolu 89162c4eda4SSukadev Bhattiprolu vinst = find_vas_instance(vasid); 89262c4eda4SSukadev Bhattiprolu if (!vinst) { 89362c4eda4SSukadev Bhattiprolu pr_devel("vasid %d not found!\n", vasid); 89462c4eda4SSukadev Bhattiprolu return ERR_PTR(-EINVAL); 89562c4eda4SSukadev Bhattiprolu } 89662c4eda4SSukadev Bhattiprolu pr_devel("Found instance %d\n", vasid); 89762c4eda4SSukadev Bhattiprolu 89862c4eda4SSukadev Bhattiprolu rxwin = vas_window_alloc(vinst); 89962c4eda4SSukadev Bhattiprolu if (IS_ERR(rxwin)) { 90062c4eda4SSukadev Bhattiprolu pr_devel("Unable to allocate memory for Rx window\n"); 90162c4eda4SSukadev Bhattiprolu return rxwin; 90262c4eda4SSukadev Bhattiprolu } 90362c4eda4SSukadev Bhattiprolu 90462c4eda4SSukadev Bhattiprolu rxwin->tx_win = false; 90562c4eda4SSukadev Bhattiprolu rxwin->nx_win = rxattr->nx_win; 90662c4eda4SSukadev Bhattiprolu rxwin->user_win = rxattr->user_win; 90762c4eda4SSukadev Bhattiprolu rxwin->cop = cop; 90862f659e0SSukadev Bhattiprolu rxwin->wcreds_max = rxattr->wcreds_max ?: VAS_WCREDS_DEFAULT; 90962c4eda4SSukadev Bhattiprolu if (rxattr->user_win) 91062c4eda4SSukadev Bhattiprolu rxwin->pid = task_pid_vnr(current); 91162c4eda4SSukadev Bhattiprolu 91262c4eda4SSukadev Bhattiprolu init_winctx_for_rxwin(rxwin, rxattr, &winctx); 91362c4eda4SSukadev Bhattiprolu init_winctx_regs(rxwin, &winctx); 91462c4eda4SSukadev Bhattiprolu 91562c4eda4SSukadev Bhattiprolu set_vinst_win(vinst, rxwin); 91662c4eda4SSukadev Bhattiprolu 91762c4eda4SSukadev Bhattiprolu return rxwin; 91862c4eda4SSukadev Bhattiprolu } 91962c4eda4SSukadev Bhattiprolu EXPORT_SYMBOL_GPL(vas_rx_win_open); 92062c4eda4SSukadev Bhattiprolu 9215239af67SSukadev Bhattiprolu void vas_init_tx_win_attr(struct vas_tx_win_attr *txattr, enum vas_cop_type cop) 9225239af67SSukadev Bhattiprolu { 9235239af67SSukadev Bhattiprolu memset(txattr, 0, sizeof(*txattr)); 9245239af67SSukadev Bhattiprolu 9255239af67SSukadev Bhattiprolu if (cop == VAS_COP_TYPE_842 || cop == VAS_COP_TYPE_842_HIPRI) { 9265239af67SSukadev Bhattiprolu txattr->rej_no_credit = false; 9275239af67SSukadev Bhattiprolu txattr->rx_wcred_mode = true; 9285239af67SSukadev Bhattiprolu txattr->tx_wcred_mode = true; 9295239af67SSukadev Bhattiprolu txattr->rx_win_ord_mode = true; 9305239af67SSukadev Bhattiprolu txattr->tx_win_ord_mode = true; 9315239af67SSukadev Bhattiprolu } else if (cop == VAS_COP_TYPE_FTW) { 9325239af67SSukadev Bhattiprolu txattr->user_win = true; 9335239af67SSukadev Bhattiprolu } 9345239af67SSukadev Bhattiprolu } 9355239af67SSukadev Bhattiprolu EXPORT_SYMBOL_GPL(vas_init_tx_win_attr); 9365239af67SSukadev Bhattiprolu 9375239af67SSukadev Bhattiprolu static void init_winctx_for_txwin(struct vas_window *txwin, 9385239af67SSukadev Bhattiprolu struct vas_tx_win_attr *txattr, 9395239af67SSukadev Bhattiprolu struct vas_winctx *winctx) 9405239af67SSukadev Bhattiprolu { 9415239af67SSukadev Bhattiprolu /* 9425239af67SSukadev Bhattiprolu * We first zero all fields and only set non-zero ones. Following 9435239af67SSukadev Bhattiprolu * are some fields set to 0/false for the stated reason: 9445239af67SSukadev Bhattiprolu * 9455239af67SSukadev Bhattiprolu * ->notify_os_intr_reg In powernv, send intrs to HV 9465239af67SSukadev Bhattiprolu * ->rsvd_txbuf_count Not supported yet. 9475239af67SSukadev Bhattiprolu * ->notify_disable False for NX windows 9485239af67SSukadev Bhattiprolu * ->xtra_write False for NX windows 9495239af67SSukadev Bhattiprolu * ->notify_early NA for NX windows 9505239af67SSukadev Bhattiprolu * ->lnotify_lpid NA for Tx windows 9515239af67SSukadev Bhattiprolu * ->lnotify_pid NA for Tx windows 9525239af67SSukadev Bhattiprolu * ->lnotify_tid NA for Tx windows 9535239af67SSukadev Bhattiprolu * ->tx_win_cred_mode Ignore for now for NX windows 9545239af67SSukadev Bhattiprolu * ->rx_win_cred_mode Ignore for now for NX windows 9555239af67SSukadev Bhattiprolu */ 9565239af67SSukadev Bhattiprolu memset(winctx, 0, sizeof(struct vas_winctx)); 9575239af67SSukadev Bhattiprolu 95862f659e0SSukadev Bhattiprolu winctx->wcreds_max = txwin->wcreds_max; 9595239af67SSukadev Bhattiprolu 9605239af67SSukadev Bhattiprolu winctx->user_win = txattr->user_win; 9615239af67SSukadev Bhattiprolu winctx->nx_win = txwin->rxwin->nx_win; 9625239af67SSukadev Bhattiprolu winctx->pin_win = txattr->pin_win; 963e34917fbSSukadev Bhattiprolu winctx->rej_no_credit = txattr->rej_no_credit; 964e34917fbSSukadev Bhattiprolu winctx->rsvd_txbuf_enable = txattr->rsvd_txbuf_enable; 9655239af67SSukadev Bhattiprolu 9665239af67SSukadev Bhattiprolu winctx->rx_wcred_mode = txattr->rx_wcred_mode; 9675239af67SSukadev Bhattiprolu winctx->tx_wcred_mode = txattr->tx_wcred_mode; 9685239af67SSukadev Bhattiprolu winctx->rx_word_mode = txattr->rx_win_ord_mode; 9695239af67SSukadev Bhattiprolu winctx->tx_word_mode = txattr->tx_win_ord_mode; 970e34917fbSSukadev Bhattiprolu winctx->rsvd_txbuf_count = txattr->rsvd_txbuf_count; 9715239af67SSukadev Bhattiprolu 9725239af67SSukadev Bhattiprolu winctx->intr_disable = true; 9736c8e6bb2SSukadev Bhattiprolu if (winctx->nx_win) 9746c8e6bb2SSukadev Bhattiprolu winctx->data_stamp = true; 9755239af67SSukadev Bhattiprolu 9765239af67SSukadev Bhattiprolu winctx->lpid = txattr->lpid; 9775239af67SSukadev Bhattiprolu winctx->pidr = txattr->pidr; 9785239af67SSukadev Bhattiprolu winctx->rx_win_id = txwin->rxwin->winid; 9795239af67SSukadev Bhattiprolu 9805239af67SSukadev Bhattiprolu winctx->dma_type = VAS_DMA_TYPE_INJECT; 9815239af67SSukadev Bhattiprolu winctx->tc_mode = txattr->tc_mode; 9825239af67SSukadev Bhattiprolu winctx->min_scope = VAS_SCOPE_LOCAL; 9835239af67SSukadev Bhattiprolu winctx->max_scope = VAS_SCOPE_VECTORED_GROUP; 9845239af67SSukadev Bhattiprolu 9855239af67SSukadev Bhattiprolu winctx->pswid = 0; 9865239af67SSukadev Bhattiprolu } 9875239af67SSukadev Bhattiprolu 9885239af67SSukadev Bhattiprolu static bool tx_win_args_valid(enum vas_cop_type cop, 9895239af67SSukadev Bhattiprolu struct vas_tx_win_attr *attr) 9905239af67SSukadev Bhattiprolu { 9915239af67SSukadev Bhattiprolu if (attr->tc_mode != VAS_THRESH_DISABLED) 9925239af67SSukadev Bhattiprolu return false; 9935239af67SSukadev Bhattiprolu 9945239af67SSukadev Bhattiprolu if (cop > VAS_COP_TYPE_MAX) 9955239af67SSukadev Bhattiprolu return false; 9965239af67SSukadev Bhattiprolu 99751b53712SSukadev Bhattiprolu if (attr->wcreds_max > VAS_TX_WCREDS_MAX) 99851b53712SSukadev Bhattiprolu return false; 99951b53712SSukadev Bhattiprolu 10005239af67SSukadev Bhattiprolu if (attr->user_win && 10015239af67SSukadev Bhattiprolu (cop != VAS_COP_TYPE_FTW || attr->rsvd_txbuf_count)) 10025239af67SSukadev Bhattiprolu return false; 10035239af67SSukadev Bhattiprolu 10045239af67SSukadev Bhattiprolu return true; 10055239af67SSukadev Bhattiprolu } 10065239af67SSukadev Bhattiprolu 10075239af67SSukadev Bhattiprolu struct vas_window *vas_tx_win_open(int vasid, enum vas_cop_type cop, 10085239af67SSukadev Bhattiprolu struct vas_tx_win_attr *attr) 10095239af67SSukadev Bhattiprolu { 10105239af67SSukadev Bhattiprolu int rc; 10115239af67SSukadev Bhattiprolu struct vas_window *txwin; 10125239af67SSukadev Bhattiprolu struct vas_window *rxwin; 10135239af67SSukadev Bhattiprolu struct vas_winctx winctx; 10145239af67SSukadev Bhattiprolu struct vas_instance *vinst; 10155239af67SSukadev Bhattiprolu 1016007bb7d6SSukadev Bhattiprolu trace_vas_tx_win_open(current, vasid, cop, attr); 1017007bb7d6SSukadev Bhattiprolu 10185239af67SSukadev Bhattiprolu if (!tx_win_args_valid(cop, attr)) 10195239af67SSukadev Bhattiprolu return ERR_PTR(-EINVAL); 10205239af67SSukadev Bhattiprolu 10216c8e6bb2SSukadev Bhattiprolu /* 10226c8e6bb2SSukadev Bhattiprolu * If caller did not specify a vasid but specified the PSWID of a 10236c8e6bb2SSukadev Bhattiprolu * receive window (applicable only to FTW windows), use the vasid 10246c8e6bb2SSukadev Bhattiprolu * from that receive window. 10256c8e6bb2SSukadev Bhattiprolu */ 10266c8e6bb2SSukadev Bhattiprolu if (vasid == -1 && attr->pswid) 10276c8e6bb2SSukadev Bhattiprolu decode_pswid(attr->pswid, &vasid, NULL); 10286c8e6bb2SSukadev Bhattiprolu 10295239af67SSukadev Bhattiprolu vinst = find_vas_instance(vasid); 10305239af67SSukadev Bhattiprolu if (!vinst) { 10315239af67SSukadev Bhattiprolu pr_devel("vasid %d not found!\n", vasid); 10325239af67SSukadev Bhattiprolu return ERR_PTR(-EINVAL); 10335239af67SSukadev Bhattiprolu } 10345239af67SSukadev Bhattiprolu 10355239af67SSukadev Bhattiprolu rxwin = get_vinst_rxwin(vinst, cop, attr->pswid); 10365239af67SSukadev Bhattiprolu if (IS_ERR(rxwin)) { 10375239af67SSukadev Bhattiprolu pr_devel("No RxWin for vasid %d, cop %d\n", vasid, cop); 10385239af67SSukadev Bhattiprolu return rxwin; 10395239af67SSukadev Bhattiprolu } 10405239af67SSukadev Bhattiprolu 10415239af67SSukadev Bhattiprolu txwin = vas_window_alloc(vinst); 10425239af67SSukadev Bhattiprolu if (IS_ERR(txwin)) { 10435239af67SSukadev Bhattiprolu rc = PTR_ERR(txwin); 10445239af67SSukadev Bhattiprolu goto put_rxwin; 10455239af67SSukadev Bhattiprolu } 10465239af67SSukadev Bhattiprolu 1047ece4e512SSukadev Bhattiprolu txwin->cop = cop; 10485239af67SSukadev Bhattiprolu txwin->tx_win = 1; 10495239af67SSukadev Bhattiprolu txwin->rxwin = rxwin; 10505239af67SSukadev Bhattiprolu txwin->nx_win = txwin->rxwin->nx_win; 10515239af67SSukadev Bhattiprolu txwin->pid = attr->pid; 10525239af67SSukadev Bhattiprolu txwin->user_win = attr->user_win; 105362f659e0SSukadev Bhattiprolu txwin->wcreds_max = attr->wcreds_max ?: VAS_WCREDS_DEFAULT; 10545239af67SSukadev Bhattiprolu 10555239af67SSukadev Bhattiprolu init_winctx_for_txwin(txwin, attr, &winctx); 10565239af67SSukadev Bhattiprolu 10575239af67SSukadev Bhattiprolu init_winctx_regs(txwin, &winctx); 10585239af67SSukadev Bhattiprolu 10595239af67SSukadev Bhattiprolu /* 10605239af67SSukadev Bhattiprolu * If its a kernel send window, map the window address into the 10615239af67SSukadev Bhattiprolu * kernel's address space. For user windows, user must issue an 10625239af67SSukadev Bhattiprolu * mmap() to map the window into their address space. 10635239af67SSukadev Bhattiprolu * 10645239af67SSukadev Bhattiprolu * NOTE: If kernel ever resubmits a user CRB after handling a page 10655239af67SSukadev Bhattiprolu * fault, we will need to map this into kernel as well. 10665239af67SSukadev Bhattiprolu */ 10675239af67SSukadev Bhattiprolu if (!txwin->user_win) { 10685239af67SSukadev Bhattiprolu txwin->paste_kaddr = map_paste_region(txwin); 10695239af67SSukadev Bhattiprolu if (IS_ERR(txwin->paste_kaddr)) { 10705239af67SSukadev Bhattiprolu rc = PTR_ERR(txwin->paste_kaddr); 10715239af67SSukadev Bhattiprolu goto free_window; 10725239af67SSukadev Bhattiprolu } 1073b00b6289SNicholas Piggin } else { 10746c8e6bb2SSukadev Bhattiprolu /* 1075b00b6289SNicholas Piggin * A user mapping must ensure that context switch issues 10766c8e6bb2SSukadev Bhattiprolu * CP_ABORT for this thread. 10776c8e6bb2SSukadev Bhattiprolu */ 1078b00b6289SNicholas Piggin rc = set_thread_uses_vas(); 1079b00b6289SNicholas Piggin if (rc) 10806c8e6bb2SSukadev Bhattiprolu goto free_window; 1081b00b6289SNicholas Piggin } 10826c8e6bb2SSukadev Bhattiprolu 10835239af67SSukadev Bhattiprolu set_vinst_win(vinst, txwin); 10845239af67SSukadev Bhattiprolu 10855239af67SSukadev Bhattiprolu return txwin; 10865239af67SSukadev Bhattiprolu 10875239af67SSukadev Bhattiprolu free_window: 10885239af67SSukadev Bhattiprolu vas_window_free(txwin); 10895239af67SSukadev Bhattiprolu 10905239af67SSukadev Bhattiprolu put_rxwin: 10915239af67SSukadev Bhattiprolu put_rx_win(rxwin); 10925239af67SSukadev Bhattiprolu return ERR_PTR(rc); 10935239af67SSukadev Bhattiprolu 10945239af67SSukadev Bhattiprolu } 10955239af67SSukadev Bhattiprolu EXPORT_SYMBOL_GPL(vas_tx_win_open); 10965239af67SSukadev Bhattiprolu 10972392c8c8SSukadev Bhattiprolu int vas_copy_crb(void *crb, int offset) 10982392c8c8SSukadev Bhattiprolu { 10992392c8c8SSukadev Bhattiprolu return vas_copy(crb, offset); 11002392c8c8SSukadev Bhattiprolu } 11012392c8c8SSukadev Bhattiprolu EXPORT_SYMBOL_GPL(vas_copy_crb); 11022392c8c8SSukadev Bhattiprolu 11032392c8c8SSukadev Bhattiprolu #define RMA_LSMP_REPORT_ENABLE PPC_BIT(53) 11042392c8c8SSukadev Bhattiprolu int vas_paste_crb(struct vas_window *txwin, int offset, bool re) 11052392c8c8SSukadev Bhattiprolu { 11062392c8c8SSukadev Bhattiprolu int rc; 11072392c8c8SSukadev Bhattiprolu void *addr; 11082392c8c8SSukadev Bhattiprolu uint64_t val; 11092392c8c8SSukadev Bhattiprolu 1110007bb7d6SSukadev Bhattiprolu trace_vas_paste_crb(current, txwin); 1111007bb7d6SSukadev Bhattiprolu 11122392c8c8SSukadev Bhattiprolu /* 11132392c8c8SSukadev Bhattiprolu * Only NX windows are supported for now and hardware assumes 11142392c8c8SSukadev Bhattiprolu * report-enable flag is set for NX windows. Ensure software 11152392c8c8SSukadev Bhattiprolu * complies too. 11162392c8c8SSukadev Bhattiprolu */ 11172392c8c8SSukadev Bhattiprolu WARN_ON_ONCE(txwin->nx_win && !re); 11182392c8c8SSukadev Bhattiprolu 11192392c8c8SSukadev Bhattiprolu addr = txwin->paste_kaddr; 11202392c8c8SSukadev Bhattiprolu if (re) { 11212392c8c8SSukadev Bhattiprolu /* 11222392c8c8SSukadev Bhattiprolu * Set the REPORT_ENABLE bit (equivalent to writing 11232392c8c8SSukadev Bhattiprolu * to 1K offset of the paste address) 11242392c8c8SSukadev Bhattiprolu */ 11252392c8c8SSukadev Bhattiprolu val = SET_FIELD(RMA_LSMP_REPORT_ENABLE, 0ULL, 1); 11262392c8c8SSukadev Bhattiprolu addr += val; 11272392c8c8SSukadev Bhattiprolu } 11282392c8c8SSukadev Bhattiprolu 11292392c8c8SSukadev Bhattiprolu /* 11302392c8c8SSukadev Bhattiprolu * Map the raw CR value from vas_paste() to an error code (there 11312392c8c8SSukadev Bhattiprolu * is just pass or fail for now though). 11322392c8c8SSukadev Bhattiprolu */ 11332392c8c8SSukadev Bhattiprolu rc = vas_paste(addr, offset); 11342392c8c8SSukadev Bhattiprolu if (rc == 2) 11352392c8c8SSukadev Bhattiprolu rc = 0; 11362392c8c8SSukadev Bhattiprolu else 11372392c8c8SSukadev Bhattiprolu rc = -EINVAL; 11382392c8c8SSukadev Bhattiprolu 11390a2c2c24SSukadev Bhattiprolu pr_debug("Txwin #%d: Msg count %llu\n", txwin->winid, 11400a2c2c24SSukadev Bhattiprolu read_hvwc_reg(txwin, VREG(LRFIFO_PUSH))); 11412392c8c8SSukadev Bhattiprolu 11422392c8c8SSukadev Bhattiprolu return rc; 11432392c8c8SSukadev Bhattiprolu } 11442392c8c8SSukadev Bhattiprolu EXPORT_SYMBOL_GPL(vas_paste_crb); 11452392c8c8SSukadev Bhattiprolu 1146dfe954e4SSukadev Bhattiprolu /* 11476fccac16SSukadev Bhattiprolu * If credit checking is enabled for this window, poll for the return 11486fccac16SSukadev Bhattiprolu * of window credits (i.e for NX engines to process any outstanding CRBs). 11496fccac16SSukadev Bhattiprolu * Since NX-842 waits for the CRBs to be processed before closing the 11506fccac16SSukadev Bhattiprolu * window, we should not have to wait for too long. 11516fccac16SSukadev Bhattiprolu * 11526fccac16SSukadev Bhattiprolu * TODO: We retry in 10ms intervals now. We could/should probably peek at 11536fccac16SSukadev Bhattiprolu * the VAS_LRFIFO_PUSH_OFFSET register to get an estimate of pending 11546fccac16SSukadev Bhattiprolu * CRBs on the FIFO and compute the delay dynamically on each retry. 11556fccac16SSukadev Bhattiprolu * But that is not really needed until we support NX-GZIP access from 11566fccac16SSukadev Bhattiprolu * user space. (NX-842 driver waits for CSB and Fast thread-wakeup 11576fccac16SSukadev Bhattiprolu * doesn't use credit checking). 11586fccac16SSukadev Bhattiprolu */ 11596fccac16SSukadev Bhattiprolu static void poll_window_credits(struct vas_window *window) 11606fccac16SSukadev Bhattiprolu { 11616fccac16SSukadev Bhattiprolu u64 val; 11626fccac16SSukadev Bhattiprolu int creds, mode; 11636fccac16SSukadev Bhattiprolu 11646fccac16SSukadev Bhattiprolu val = read_hvwc_reg(window, VREG(WINCTL)); 11656fccac16SSukadev Bhattiprolu if (window->tx_win) 11666fccac16SSukadev Bhattiprolu mode = GET_FIELD(VAS_WINCTL_TX_WCRED_MODE, val); 11676fccac16SSukadev Bhattiprolu else 11686fccac16SSukadev Bhattiprolu mode = GET_FIELD(VAS_WINCTL_RX_WCRED_MODE, val); 11696fccac16SSukadev Bhattiprolu 11706fccac16SSukadev Bhattiprolu if (!mode) 11716fccac16SSukadev Bhattiprolu return; 11726fccac16SSukadev Bhattiprolu retry: 11736fccac16SSukadev Bhattiprolu if (window->tx_win) { 11746fccac16SSukadev Bhattiprolu val = read_hvwc_reg(window, VREG(TX_WCRED)); 11756fccac16SSukadev Bhattiprolu creds = GET_FIELD(VAS_TX_WCRED, val); 11766fccac16SSukadev Bhattiprolu } else { 11776fccac16SSukadev Bhattiprolu val = read_hvwc_reg(window, VREG(LRX_WCRED)); 11786fccac16SSukadev Bhattiprolu creds = GET_FIELD(VAS_LRX_WCRED, val); 11796fccac16SSukadev Bhattiprolu } 11806fccac16SSukadev Bhattiprolu 11816fccac16SSukadev Bhattiprolu if (creds < window->wcreds_max) { 11826fccac16SSukadev Bhattiprolu val = 0; 11836fccac16SSukadev Bhattiprolu set_current_state(TASK_UNINTERRUPTIBLE); 11846fccac16SSukadev Bhattiprolu schedule_timeout(msecs_to_jiffies(10)); 11856fccac16SSukadev Bhattiprolu goto retry; 11866fccac16SSukadev Bhattiprolu } 11876fccac16SSukadev Bhattiprolu } 11886fccac16SSukadev Bhattiprolu 11896fccac16SSukadev Bhattiprolu /* 1190dfe954e4SSukadev Bhattiprolu * Wait for the window to go to "not-busy" state. It should only take a 1191dfe954e4SSukadev Bhattiprolu * short time to queue a CRB, so window should not be busy for too long. 1192dfe954e4SSukadev Bhattiprolu * Trying 5ms intervals. 1193dfe954e4SSukadev Bhattiprolu */ 119498271d41SSukadev Bhattiprolu static void poll_window_busy_state(struct vas_window *window) 119598271d41SSukadev Bhattiprolu { 119698271d41SSukadev Bhattiprolu int busy; 119798271d41SSukadev Bhattiprolu u64 val; 119898271d41SSukadev Bhattiprolu 119998271d41SSukadev Bhattiprolu retry: 120098271d41SSukadev Bhattiprolu val = read_hvwc_reg(window, VREG(WIN_STATUS)); 120198271d41SSukadev Bhattiprolu busy = GET_FIELD(VAS_WIN_BUSY, val); 120298271d41SSukadev Bhattiprolu if (busy) { 120398271d41SSukadev Bhattiprolu val = 0; 120498271d41SSukadev Bhattiprolu set_current_state(TASK_UNINTERRUPTIBLE); 1205dfe954e4SSukadev Bhattiprolu schedule_timeout(msecs_to_jiffies(5)); 120698271d41SSukadev Bhattiprolu goto retry; 120798271d41SSukadev Bhattiprolu } 120898271d41SSukadev Bhattiprolu } 120998271d41SSukadev Bhattiprolu 12104963ac36SSukadev Bhattiprolu /* 12114963ac36SSukadev Bhattiprolu * Have the hardware cast a window out of cache and wait for it to 12124963ac36SSukadev Bhattiprolu * be completed. 12134963ac36SSukadev Bhattiprolu * 12144963ac36SSukadev Bhattiprolu * NOTE: It can take a relatively long time to cast the window context 12154963ac36SSukadev Bhattiprolu * out of the cache. It is not strictly necessary to cast out if: 12164963ac36SSukadev Bhattiprolu * 12174963ac36SSukadev Bhattiprolu * - we clear the "Pin Window" bit (so hardware is free to evict) 12184963ac36SSukadev Bhattiprolu * 12194963ac36SSukadev Bhattiprolu * - we re-initialize the window context when it is reassigned. 12204963ac36SSukadev Bhattiprolu * 12214963ac36SSukadev Bhattiprolu * We do the former in vas_win_close() and latter in vas_win_open(). 12224963ac36SSukadev Bhattiprolu * So, ignoring the cast-out for now. We can add it as needed. If 12234963ac36SSukadev Bhattiprolu * casting out becomes necessary we should consider offloading the 12244963ac36SSukadev Bhattiprolu * job to a worker thread, so the window close can proceed quickly. 12254963ac36SSukadev Bhattiprolu */ 122698271d41SSukadev Bhattiprolu static void poll_window_castout(struct vas_window *window) 122798271d41SSukadev Bhattiprolu { 12284963ac36SSukadev Bhattiprolu /* stub for now */ 122998271d41SSukadev Bhattiprolu } 123098271d41SSukadev Bhattiprolu 123198271d41SSukadev Bhattiprolu /* 123236a288feSSukadev Bhattiprolu * Unpin and close a window so no new requests are accepted and the 123336a288feSSukadev Bhattiprolu * hardware can evict this window from cache if necessary. 123436a288feSSukadev Bhattiprolu */ 123536a288feSSukadev Bhattiprolu static void unpin_close_window(struct vas_window *window) 123636a288feSSukadev Bhattiprolu { 123736a288feSSukadev Bhattiprolu u64 val; 123836a288feSSukadev Bhattiprolu 123936a288feSSukadev Bhattiprolu val = read_hvwc_reg(window, VREG(WINCTL)); 124036a288feSSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_PIN, val, 0); 124136a288feSSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_OPEN, val, 0); 124236a288feSSukadev Bhattiprolu write_hvwc_reg(window, VREG(WINCTL), val); 124336a288feSSukadev Bhattiprolu } 124436a288feSSukadev Bhattiprolu 124536a288feSSukadev Bhattiprolu /* 124698271d41SSukadev Bhattiprolu * Close a window. 124798271d41SSukadev Bhattiprolu * 124898271d41SSukadev Bhattiprolu * See Section 1.12.1 of VAS workbook v1.05 for details on closing window: 124998271d41SSukadev Bhattiprolu * - Disable new paste operations (unmap paste address) 125098271d41SSukadev Bhattiprolu * - Poll for the "Window Busy" bit to be cleared 125198271d41SSukadev Bhattiprolu * - Clear the Open/Enable bit for the Window. 125298271d41SSukadev Bhattiprolu * - Poll for return of window Credits (implies FIFO empty for Rx win?) 125398271d41SSukadev Bhattiprolu * - Unpin and cast window context out of cache 125498271d41SSukadev Bhattiprolu * 125598271d41SSukadev Bhattiprolu * Besides the hardware, kernel has some bookkeeping of course. 125698271d41SSukadev Bhattiprolu */ 12574dea2d1aSSukadev Bhattiprolu int vas_win_close(struct vas_window *window) 12584dea2d1aSSukadev Bhattiprolu { 125998271d41SSukadev Bhattiprolu if (!window) 126098271d41SSukadev Bhattiprolu return 0; 126198271d41SSukadev Bhattiprolu 126298271d41SSukadev Bhattiprolu if (!window->tx_win && atomic_read(&window->num_txwins) != 0) { 126398271d41SSukadev Bhattiprolu pr_devel("Attempting to close an active Rx window!\n"); 126498271d41SSukadev Bhattiprolu WARN_ON_ONCE(1); 126598271d41SSukadev Bhattiprolu return -EBUSY; 12664dea2d1aSSukadev Bhattiprolu } 126798271d41SSukadev Bhattiprolu 126898271d41SSukadev Bhattiprolu unmap_paste_region(window); 126998271d41SSukadev Bhattiprolu 127098271d41SSukadev Bhattiprolu clear_vinst_win(window); 127198271d41SSukadev Bhattiprolu 127298271d41SSukadev Bhattiprolu poll_window_busy_state(window); 127398271d41SSukadev Bhattiprolu 127436a288feSSukadev Bhattiprolu unpin_close_window(window); 127598271d41SSukadev Bhattiprolu 12766fccac16SSukadev Bhattiprolu poll_window_credits(window); 12776fccac16SSukadev Bhattiprolu 127898271d41SSukadev Bhattiprolu poll_window_castout(window); 127998271d41SSukadev Bhattiprolu 128098271d41SSukadev Bhattiprolu /* if send window, drop reference to matching receive window */ 128198271d41SSukadev Bhattiprolu if (window->tx_win) 128298271d41SSukadev Bhattiprolu put_rx_win(window->rxwin); 128398271d41SSukadev Bhattiprolu 128498271d41SSukadev Bhattiprolu vas_window_free(window); 128598271d41SSukadev Bhattiprolu 128698271d41SSukadev Bhattiprolu return 0; 128798271d41SSukadev Bhattiprolu } 128898271d41SSukadev Bhattiprolu EXPORT_SYMBOL_GPL(vas_win_close); 128961f3cca8SSukadev Bhattiprolu 129061f3cca8SSukadev Bhattiprolu /* 129161f3cca8SSukadev Bhattiprolu * Return a system-wide unique window id for the window @win. 129261f3cca8SSukadev Bhattiprolu */ 129361f3cca8SSukadev Bhattiprolu u32 vas_win_id(struct vas_window *win) 129461f3cca8SSukadev Bhattiprolu { 129561f3cca8SSukadev Bhattiprolu return encode_pswid(win->vinst->vas_id, win->winid); 129661f3cca8SSukadev Bhattiprolu } 129761f3cca8SSukadev Bhattiprolu EXPORT_SYMBOL_GPL(vas_win_id); 1298