12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 24dea2d1aSSukadev Bhattiprolu /* 34dea2d1aSSukadev Bhattiprolu * Copyright 2016-17 IBM Corp. 44dea2d1aSSukadev Bhattiprolu */ 54dea2d1aSSukadev Bhattiprolu 6180fe15aSSukadev Bhattiprolu #define pr_fmt(fmt) "vas: " fmt 7180fe15aSSukadev Bhattiprolu 84dea2d1aSSukadev Bhattiprolu #include <linux/types.h> 94dea2d1aSSukadev Bhattiprolu #include <linux/mutex.h> 10180fe15aSSukadev Bhattiprolu #include <linux/slab.h> 11180fe15aSSukadev Bhattiprolu #include <linux/io.h> 12b25b33acSSukadev Bhattiprolu #include <linux/log2.h> 1362c4eda4SSukadev Bhattiprolu #include <linux/rcupdate.h> 1462c4eda4SSukadev Bhattiprolu #include <linux/cred.h> 156c8e6bb2SSukadev Bhattiprolu #include <asm/switch_to.h> 166c8e6bb2SSukadev Bhattiprolu #include <asm/ppc-opcode.h> 174dea2d1aSSukadev Bhattiprolu #include "vas.h" 182392c8c8SSukadev Bhattiprolu #include "copy-paste.h" 194dea2d1aSSukadev Bhattiprolu 20007bb7d6SSukadev Bhattiprolu #define CREATE_TRACE_POINTS 21007bb7d6SSukadev Bhattiprolu #include "vas-trace.h" 22007bb7d6SSukadev Bhattiprolu 23180fe15aSSukadev Bhattiprolu /* 24180fe15aSSukadev Bhattiprolu * Compute the paste address region for the window @window using the 25180fe15aSSukadev Bhattiprolu * ->paste_base_addr and ->paste_win_id_shift we got from device tree. 26180fe15aSSukadev Bhattiprolu */ 27180fe15aSSukadev Bhattiprolu static void compute_paste_address(struct vas_window *window, u64 *addr, int *len) 28180fe15aSSukadev Bhattiprolu { 29180fe15aSSukadev Bhattiprolu int winid; 30180fe15aSSukadev Bhattiprolu u64 base, shift; 31180fe15aSSukadev Bhattiprolu 32180fe15aSSukadev Bhattiprolu base = window->vinst->paste_base_addr; 33180fe15aSSukadev Bhattiprolu shift = window->vinst->paste_win_id_shift; 34180fe15aSSukadev Bhattiprolu winid = window->winid; 35180fe15aSSukadev Bhattiprolu 36180fe15aSSukadev Bhattiprolu *addr = base + (winid << shift); 37180fe15aSSukadev Bhattiprolu if (len) 38180fe15aSSukadev Bhattiprolu *len = PAGE_SIZE; 39180fe15aSSukadev Bhattiprolu 40180fe15aSSukadev Bhattiprolu pr_debug("Txwin #%d: Paste addr 0x%llx\n", winid, *addr); 41180fe15aSSukadev Bhattiprolu } 42180fe15aSSukadev Bhattiprolu 43180fe15aSSukadev Bhattiprolu static inline void get_hvwc_mmio_bar(struct vas_window *window, 44180fe15aSSukadev Bhattiprolu u64 *start, int *len) 45180fe15aSSukadev Bhattiprolu { 46180fe15aSSukadev Bhattiprolu u64 pbaddr; 47180fe15aSSukadev Bhattiprolu 48180fe15aSSukadev Bhattiprolu pbaddr = window->vinst->hvwc_bar_start; 49180fe15aSSukadev Bhattiprolu *start = pbaddr + window->winid * VAS_HVWC_SIZE; 50180fe15aSSukadev Bhattiprolu *len = VAS_HVWC_SIZE; 51180fe15aSSukadev Bhattiprolu } 52180fe15aSSukadev Bhattiprolu 53180fe15aSSukadev Bhattiprolu static inline void get_uwc_mmio_bar(struct vas_window *window, 54180fe15aSSukadev Bhattiprolu u64 *start, int *len) 55180fe15aSSukadev Bhattiprolu { 56180fe15aSSukadev Bhattiprolu u64 pbaddr; 57180fe15aSSukadev Bhattiprolu 58180fe15aSSukadev Bhattiprolu pbaddr = window->vinst->uwc_bar_start; 59180fe15aSSukadev Bhattiprolu *start = pbaddr + window->winid * VAS_UWC_SIZE; 60180fe15aSSukadev Bhattiprolu *len = VAS_UWC_SIZE; 61180fe15aSSukadev Bhattiprolu } 62180fe15aSSukadev Bhattiprolu 63180fe15aSSukadev Bhattiprolu /* 64180fe15aSSukadev Bhattiprolu * Map the paste bus address of the given send window into kernel address 65180fe15aSSukadev Bhattiprolu * space. Unlike MMIO regions (map_mmio_region() below), paste region must 66180fe15aSSukadev Bhattiprolu * be mapped cache-able and is only applicable to send windows. 67180fe15aSSukadev Bhattiprolu */ 685239af67SSukadev Bhattiprolu static void *map_paste_region(struct vas_window *txwin) 69180fe15aSSukadev Bhattiprolu { 70180fe15aSSukadev Bhattiprolu int len; 71180fe15aSSukadev Bhattiprolu void *map; 72180fe15aSSukadev Bhattiprolu char *name; 73180fe15aSSukadev Bhattiprolu u64 start; 74180fe15aSSukadev Bhattiprolu 75180fe15aSSukadev Bhattiprolu name = kasprintf(GFP_KERNEL, "window-v%d-w%d", txwin->vinst->vas_id, 76180fe15aSSukadev Bhattiprolu txwin->winid); 77180fe15aSSukadev Bhattiprolu if (!name) 78180fe15aSSukadev Bhattiprolu goto free_name; 79180fe15aSSukadev Bhattiprolu 80180fe15aSSukadev Bhattiprolu txwin->paste_addr_name = name; 81180fe15aSSukadev Bhattiprolu compute_paste_address(txwin, &start, &len); 82180fe15aSSukadev Bhattiprolu 83180fe15aSSukadev Bhattiprolu if (!request_mem_region(start, len, name)) { 84180fe15aSSukadev Bhattiprolu pr_devel("%s(): request_mem_region(0x%llx, %d) failed\n", 85180fe15aSSukadev Bhattiprolu __func__, start, len); 86180fe15aSSukadev Bhattiprolu goto free_name; 87180fe15aSSukadev Bhattiprolu } 88180fe15aSSukadev Bhattiprolu 89180fe15aSSukadev Bhattiprolu map = ioremap_cache(start, len); 90180fe15aSSukadev Bhattiprolu if (!map) { 91180fe15aSSukadev Bhattiprolu pr_devel("%s(): ioremap_cache(0x%llx, %d) failed\n", __func__, 92180fe15aSSukadev Bhattiprolu start, len); 93180fe15aSSukadev Bhattiprolu goto free_name; 94180fe15aSSukadev Bhattiprolu } 95180fe15aSSukadev Bhattiprolu 96180fe15aSSukadev Bhattiprolu pr_devel("Mapped paste addr 0x%llx to kaddr 0x%p\n", start, map); 97180fe15aSSukadev Bhattiprolu return map; 98180fe15aSSukadev Bhattiprolu 99180fe15aSSukadev Bhattiprolu free_name: 100180fe15aSSukadev Bhattiprolu kfree(name); 101180fe15aSSukadev Bhattiprolu return ERR_PTR(-ENOMEM); 102180fe15aSSukadev Bhattiprolu } 103180fe15aSSukadev Bhattiprolu 104180fe15aSSukadev Bhattiprolu static void *map_mmio_region(char *name, u64 start, int len) 105180fe15aSSukadev Bhattiprolu { 106180fe15aSSukadev Bhattiprolu void *map; 107180fe15aSSukadev Bhattiprolu 108180fe15aSSukadev Bhattiprolu if (!request_mem_region(start, len, name)) { 109180fe15aSSukadev Bhattiprolu pr_devel("%s(): request_mem_region(0x%llx, %d) failed\n", 110180fe15aSSukadev Bhattiprolu __func__, start, len); 111180fe15aSSukadev Bhattiprolu return NULL; 112180fe15aSSukadev Bhattiprolu } 113180fe15aSSukadev Bhattiprolu 114180fe15aSSukadev Bhattiprolu map = ioremap(start, len); 115180fe15aSSukadev Bhattiprolu if (!map) { 116180fe15aSSukadev Bhattiprolu pr_devel("%s(): ioremap(0x%llx, %d) failed\n", __func__, start, 117180fe15aSSukadev Bhattiprolu len); 118180fe15aSSukadev Bhattiprolu return NULL; 119180fe15aSSukadev Bhattiprolu } 120180fe15aSSukadev Bhattiprolu 121180fe15aSSukadev Bhattiprolu return map; 122180fe15aSSukadev Bhattiprolu } 123180fe15aSSukadev Bhattiprolu 124180fe15aSSukadev Bhattiprolu static void unmap_region(void *addr, u64 start, int len) 125180fe15aSSukadev Bhattiprolu { 126180fe15aSSukadev Bhattiprolu iounmap(addr); 127180fe15aSSukadev Bhattiprolu release_mem_region((phys_addr_t)start, len); 128180fe15aSSukadev Bhattiprolu } 129180fe15aSSukadev Bhattiprolu 130180fe15aSSukadev Bhattiprolu /* 131180fe15aSSukadev Bhattiprolu * Unmap the paste address region for a window. 132180fe15aSSukadev Bhattiprolu */ 13398271d41SSukadev Bhattiprolu static void unmap_paste_region(struct vas_window *window) 134180fe15aSSukadev Bhattiprolu { 135180fe15aSSukadev Bhattiprolu int len; 136180fe15aSSukadev Bhattiprolu u64 busaddr_start; 137180fe15aSSukadev Bhattiprolu 138180fe15aSSukadev Bhattiprolu if (window->paste_kaddr) { 139180fe15aSSukadev Bhattiprolu compute_paste_address(window, &busaddr_start, &len); 140180fe15aSSukadev Bhattiprolu unmap_region(window->paste_kaddr, busaddr_start, len); 141180fe15aSSukadev Bhattiprolu window->paste_kaddr = NULL; 142180fe15aSSukadev Bhattiprolu kfree(window->paste_addr_name); 143180fe15aSSukadev Bhattiprolu window->paste_addr_name = NULL; 144180fe15aSSukadev Bhattiprolu } 145180fe15aSSukadev Bhattiprolu } 146180fe15aSSukadev Bhattiprolu 147180fe15aSSukadev Bhattiprolu /* 148ece4e512SSukadev Bhattiprolu * Unmap the MMIO regions for a window. Hold the vas_mutex so we don't 149ece4e512SSukadev Bhattiprolu * unmap when the window's debugfs dir is in use. This serializes close 150ece4e512SSukadev Bhattiprolu * of a window even on another VAS instance but since its not a critical 151ece4e512SSukadev Bhattiprolu * path, just minimize the time we hold the mutex for now. We can add 152ece4e512SSukadev Bhattiprolu * a per-instance mutex later if necessary. 153180fe15aSSukadev Bhattiprolu */ 154180fe15aSSukadev Bhattiprolu static void unmap_winctx_mmio_bars(struct vas_window *window) 155180fe15aSSukadev Bhattiprolu { 156180fe15aSSukadev Bhattiprolu int len; 157ece4e512SSukadev Bhattiprolu void *uwc_map; 158ece4e512SSukadev Bhattiprolu void *hvwc_map; 159180fe15aSSukadev Bhattiprolu u64 busaddr_start; 160180fe15aSSukadev Bhattiprolu 161ece4e512SSukadev Bhattiprolu mutex_lock(&vas_mutex); 162ece4e512SSukadev Bhattiprolu 163ece4e512SSukadev Bhattiprolu hvwc_map = window->hvwc_map; 164180fe15aSSukadev Bhattiprolu window->hvwc_map = NULL; 165ece4e512SSukadev Bhattiprolu 166ece4e512SSukadev Bhattiprolu uwc_map = window->uwc_map; 167ece4e512SSukadev Bhattiprolu window->uwc_map = NULL; 168ece4e512SSukadev Bhattiprolu 169ece4e512SSukadev Bhattiprolu mutex_unlock(&vas_mutex); 170ece4e512SSukadev Bhattiprolu 171ece4e512SSukadev Bhattiprolu if (hvwc_map) { 172ece4e512SSukadev Bhattiprolu get_hvwc_mmio_bar(window, &busaddr_start, &len); 173ece4e512SSukadev Bhattiprolu unmap_region(hvwc_map, busaddr_start, len); 174180fe15aSSukadev Bhattiprolu } 175180fe15aSSukadev Bhattiprolu 176ece4e512SSukadev Bhattiprolu if (uwc_map) { 177180fe15aSSukadev Bhattiprolu get_uwc_mmio_bar(window, &busaddr_start, &len); 178ece4e512SSukadev Bhattiprolu unmap_region(uwc_map, busaddr_start, len); 179180fe15aSSukadev Bhattiprolu } 180180fe15aSSukadev Bhattiprolu } 181180fe15aSSukadev Bhattiprolu 182180fe15aSSukadev Bhattiprolu /* 183180fe15aSSukadev Bhattiprolu * Find the Hypervisor Window Context (HVWC) MMIO Base Address Region and the 184180fe15aSSukadev Bhattiprolu * OS/User Window Context (UWC) MMIO Base Address Region for the given window. 185180fe15aSSukadev Bhattiprolu * Map these bus addresses and save the mapped kernel addresses in @window. 186180fe15aSSukadev Bhattiprolu */ 187180fe15aSSukadev Bhattiprolu int map_winctx_mmio_bars(struct vas_window *window) 188180fe15aSSukadev Bhattiprolu { 189180fe15aSSukadev Bhattiprolu int len; 190180fe15aSSukadev Bhattiprolu u64 start; 191180fe15aSSukadev Bhattiprolu 192180fe15aSSukadev Bhattiprolu get_hvwc_mmio_bar(window, &start, &len); 193180fe15aSSukadev Bhattiprolu window->hvwc_map = map_mmio_region("HVWCM_Window", start, len); 194180fe15aSSukadev Bhattiprolu 195180fe15aSSukadev Bhattiprolu get_uwc_mmio_bar(window, &start, &len); 196180fe15aSSukadev Bhattiprolu window->uwc_map = map_mmio_region("UWCM_Window", start, len); 197180fe15aSSukadev Bhattiprolu 198180fe15aSSukadev Bhattiprolu if (!window->hvwc_map || !window->uwc_map) { 199180fe15aSSukadev Bhattiprolu unmap_winctx_mmio_bars(window); 200180fe15aSSukadev Bhattiprolu return -1; 201180fe15aSSukadev Bhattiprolu } 202180fe15aSSukadev Bhattiprolu 203180fe15aSSukadev Bhattiprolu return 0; 204180fe15aSSukadev Bhattiprolu } 205180fe15aSSukadev Bhattiprolu 206b25b33acSSukadev Bhattiprolu /* 207b25b33acSSukadev Bhattiprolu * Reset all valid registers in the HV and OS/User Window Contexts for 208b25b33acSSukadev Bhattiprolu * the window identified by @window. 209b25b33acSSukadev Bhattiprolu * 210b25b33acSSukadev Bhattiprolu * NOTE: We cannot really use a for loop to reset window context. Not all 211b25b33acSSukadev Bhattiprolu * offsets in a window context are valid registers and the valid 212b25b33acSSukadev Bhattiprolu * registers are not sequential. And, we can only write to offsets 213b25b33acSSukadev Bhattiprolu * with valid registers. 214b25b33acSSukadev Bhattiprolu */ 215b25b33acSSukadev Bhattiprolu void reset_window_regs(struct vas_window *window) 216b25b33acSSukadev Bhattiprolu { 217b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LPID), 0ULL); 218b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(PID), 0ULL); 219b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(XLATE_MSR), 0ULL); 220b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(XLATE_LPCR), 0ULL); 221b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(XLATE_CTL), 0ULL); 222b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(AMR), 0ULL); 223b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(SEIDR), 0ULL); 224b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(FAULT_TX_WIN), 0ULL); 225b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(OSU_INTR_SRC_RA), 0ULL); 226b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(HV_INTR_SRC_RA), 0ULL); 227b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(PSWID), 0ULL); 228b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LFIFO_BAR), 0ULL); 229b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LDATA_STAMP_CTL), 0ULL); 230b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LDMA_CACHE_CTL), 0ULL); 231b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LRFIFO_PUSH), 0ULL); 232b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(CURR_MSG_COUNT), 0ULL); 233b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_AFTER_COUNT), 0ULL); 234b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LRX_WCRED), 0ULL); 235b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LRX_WCRED_ADDER), 0ULL); 236b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(TX_WCRED), 0ULL); 237b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(TX_WCRED_ADDER), 0ULL); 238b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LFIFO_SIZE), 0ULL); 239b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(WINCTL), 0ULL); 240b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(WIN_STATUS), 0ULL); 241b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(WIN_CTX_CACHING_CTL), 0ULL); 242b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(TX_RSVD_BUF_COUNT), 0ULL); 243b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LRFIFO_WIN_PTR), 0ULL); 244b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_CTL), 0ULL); 245b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_PID), 0ULL); 246b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_LPID), 0ULL); 247b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_TID), 0ULL); 248b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_SCOPE), 0ULL); 249b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(NX_UTIL_ADDER), 0ULL); 250b25b33acSSukadev Bhattiprolu 251b25b33acSSukadev Bhattiprolu /* Skip read-only registers: NX_UTIL and NX_UTIL_SE */ 252b25b33acSSukadev Bhattiprolu 253b25b33acSSukadev Bhattiprolu /* 254b25b33acSSukadev Bhattiprolu * The send and receive window credit adder registers are also 255b25b33acSSukadev Bhattiprolu * accessible from HVWC and have been initialized above. We don't 256b25b33acSSukadev Bhattiprolu * need to initialize from the OS/User Window Context, so skip 257b25b33acSSukadev Bhattiprolu * following calls: 258b25b33acSSukadev Bhattiprolu * 259b25b33acSSukadev Bhattiprolu * write_uwc_reg(window, VREG(TX_WCRED_ADDER), 0ULL); 260b25b33acSSukadev Bhattiprolu * write_uwc_reg(window, VREG(LRX_WCRED_ADDER), 0ULL); 261b25b33acSSukadev Bhattiprolu */ 262b25b33acSSukadev Bhattiprolu } 263b25b33acSSukadev Bhattiprolu 264b25b33acSSukadev Bhattiprolu /* 265b25b33acSSukadev Bhattiprolu * Initialize window context registers related to Address Translation. 266b25b33acSSukadev Bhattiprolu * These registers are common to send/receive windows although they 267b25b33acSSukadev Bhattiprolu * differ for user/kernel windows. As we resolve the TODOs we may 268b25b33acSSukadev Bhattiprolu * want to add fields to vas_winctx and move the initialization to 269b25b33acSSukadev Bhattiprolu * init_vas_winctx_regs(). 270b25b33acSSukadev Bhattiprolu */ 271b25b33acSSukadev Bhattiprolu static void init_xlate_regs(struct vas_window *window, bool user_win) 272b25b33acSSukadev Bhattiprolu { 273b25b33acSSukadev Bhattiprolu u64 lpcr, val; 274b25b33acSSukadev Bhattiprolu 275b25b33acSSukadev Bhattiprolu /* 276b25b33acSSukadev Bhattiprolu * MSR_TA, MSR_US are false for both kernel and user. 277b25b33acSSukadev Bhattiprolu * MSR_DR and MSR_PR are false for kernel. 278b25b33acSSukadev Bhattiprolu */ 279b25b33acSSukadev Bhattiprolu val = 0ULL; 280b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_XLATE_MSR_HV, val, 1); 281b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_XLATE_MSR_SF, val, 1); 282b25b33acSSukadev Bhattiprolu if (user_win) { 283b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_XLATE_MSR_DR, val, 1); 284b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_XLATE_MSR_PR, val, 1); 285b25b33acSSukadev Bhattiprolu } 286b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(XLATE_MSR), val); 287b25b33acSSukadev Bhattiprolu 288b25b33acSSukadev Bhattiprolu lpcr = mfspr(SPRN_LPCR); 289b25b33acSSukadev Bhattiprolu val = 0ULL; 290b25b33acSSukadev Bhattiprolu /* 291b25b33acSSukadev Bhattiprolu * NOTE: From Section 5.7.8.1 Segment Lookaside Buffer of the 292b25b33acSSukadev Bhattiprolu * Power ISA, v3.0B, Page size encoding is 0 = 4KB, 5 = 64KB. 293b25b33acSSukadev Bhattiprolu * 294b25b33acSSukadev Bhattiprolu * NOTE: From Section 1.3.1, Address Translation Context of the 295b25b33acSSukadev Bhattiprolu * Nest MMU Workbook, LPCR_SC should be 0 for Power9. 296b25b33acSSukadev Bhattiprolu */ 297b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_XLATE_LPCR_PAGE_SIZE, val, 5); 298b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_XLATE_LPCR_ISL, val, lpcr & LPCR_ISL); 299b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_XLATE_LPCR_TC, val, lpcr & LPCR_TC); 300b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_XLATE_LPCR_SC, val, 0); 301b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(XLATE_LPCR), val); 302b25b33acSSukadev Bhattiprolu 303b25b33acSSukadev Bhattiprolu /* 304b25b33acSSukadev Bhattiprolu * Section 1.3.1 (Address translation Context) of NMMU workbook. 305b25b33acSSukadev Bhattiprolu * 0b00 Hashed Page Table mode 306b25b33acSSukadev Bhattiprolu * 0b01 Reserved 307b25b33acSSukadev Bhattiprolu * 0b10 Radix on HPT 308b25b33acSSukadev Bhattiprolu * 0b11 Radix on Radix 309b25b33acSSukadev Bhattiprolu */ 310b25b33acSSukadev Bhattiprolu val = 0ULL; 311b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_XLATE_MODE, val, radix_enabled() ? 3 : 2); 312b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(XLATE_CTL), val); 313b25b33acSSukadev Bhattiprolu 314b25b33acSSukadev Bhattiprolu /* 315b25b33acSSukadev Bhattiprolu * TODO: Can we mfspr(AMR) even for user windows? 316b25b33acSSukadev Bhattiprolu */ 317b25b33acSSukadev Bhattiprolu val = 0ULL; 318b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_AMR, val, mfspr(SPRN_AMR)); 319b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(AMR), val); 320b25b33acSSukadev Bhattiprolu 321b25b33acSSukadev Bhattiprolu val = 0ULL; 322b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_SEIDR, val, 0); 323b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(SEIDR), val); 324b25b33acSSukadev Bhattiprolu } 325b25b33acSSukadev Bhattiprolu 326b25b33acSSukadev Bhattiprolu /* 327b25b33acSSukadev Bhattiprolu * Initialize Reserved Send Buffer Count for the send window. It involves 328b25b33acSSukadev Bhattiprolu * writing to the register, reading it back to confirm that the hardware 329b25b33acSSukadev Bhattiprolu * has enough buffers to reserve. See section 1.3.1.2.1 of VAS workbook. 330b25b33acSSukadev Bhattiprolu * 331b25b33acSSukadev Bhattiprolu * Since we can only make a best-effort attempt to fulfill the request, 332b25b33acSSukadev Bhattiprolu * we don't return any errors if we cannot. 333b25b33acSSukadev Bhattiprolu * 334b25b33acSSukadev Bhattiprolu * TODO: Reserved (aka dedicated) send buffers are not supported yet. 335b25b33acSSukadev Bhattiprolu */ 336b25b33acSSukadev Bhattiprolu static void init_rsvd_tx_buf_count(struct vas_window *txwin, 337b25b33acSSukadev Bhattiprolu struct vas_winctx *winctx) 338b25b33acSSukadev Bhattiprolu { 339b25b33acSSukadev Bhattiprolu write_hvwc_reg(txwin, VREG(TX_RSVD_BUF_COUNT), 0ULL); 340b25b33acSSukadev Bhattiprolu } 341b25b33acSSukadev Bhattiprolu 342b25b33acSSukadev Bhattiprolu /* 343b25b33acSSukadev Bhattiprolu * init_winctx_regs() 344b25b33acSSukadev Bhattiprolu * Initialize window context registers for a receive window. 345b25b33acSSukadev Bhattiprolu * Except for caching control and marking window open, the registers 346b25b33acSSukadev Bhattiprolu * are initialized in the order listed in Section 3.1.4 (Window Context 347b25b33acSSukadev Bhattiprolu * Cache Register Details) of the VAS workbook although they don't need 348b25b33acSSukadev Bhattiprolu * to be. 349b25b33acSSukadev Bhattiprolu * 350b25b33acSSukadev Bhattiprolu * Design note: For NX receive windows, NX allocates the FIFO buffer in OPAL 351b25b33acSSukadev Bhattiprolu * (so that it can get a large contiguous area) and passes that buffer 352b25b33acSSukadev Bhattiprolu * to kernel via device tree. We now write that buffer address to the 353b25b33acSSukadev Bhattiprolu * FIFO BAR. Would it make sense to do this all in OPAL? i.e have OPAL 354b25b33acSSukadev Bhattiprolu * write the per-chip RX FIFO addresses to the windows during boot-up 355b25b33acSSukadev Bhattiprolu * as a one-time task? That could work for NX but what about other 356b25b33acSSukadev Bhattiprolu * receivers? Let the receivers tell us the rx-fifo buffers for now. 357b25b33acSSukadev Bhattiprolu */ 358b25b33acSSukadev Bhattiprolu int init_winctx_regs(struct vas_window *window, struct vas_winctx *winctx) 359b25b33acSSukadev Bhattiprolu { 360b25b33acSSukadev Bhattiprolu u64 val; 361b25b33acSSukadev Bhattiprolu int fifo_size; 362b25b33acSSukadev Bhattiprolu 363b25b33acSSukadev Bhattiprolu reset_window_regs(window); 364b25b33acSSukadev Bhattiprolu 365b25b33acSSukadev Bhattiprolu val = 0ULL; 366b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LPID, val, winctx->lpid); 367b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LPID), val); 368b25b33acSSukadev Bhattiprolu 369b25b33acSSukadev Bhattiprolu val = 0ULL; 370b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_PID_ID, val, winctx->pidr); 371b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(PID), val); 372b25b33acSSukadev Bhattiprolu 373b25b33acSSukadev Bhattiprolu init_xlate_regs(window, winctx->user_win); 374b25b33acSSukadev Bhattiprolu 375b25b33acSSukadev Bhattiprolu val = 0ULL; 376b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_FAULT_TX_WIN, val, 0); 377b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(FAULT_TX_WIN), val); 378b25b33acSSukadev Bhattiprolu 379b25b33acSSukadev Bhattiprolu /* In PowerNV, interrupts go to HV. */ 380b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(OSU_INTR_SRC_RA), 0ULL); 381b25b33acSSukadev Bhattiprolu 382b25b33acSSukadev Bhattiprolu val = 0ULL; 383b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_HV_INTR_SRC_RA, val, winctx->irq_port); 384b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(HV_INTR_SRC_RA), val); 385b25b33acSSukadev Bhattiprolu 386b25b33acSSukadev Bhattiprolu val = 0ULL; 387b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_PSWID_EA_HANDLE, val, winctx->pswid); 388b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(PSWID), val); 389b25b33acSSukadev Bhattiprolu 390b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(SPARE1), 0ULL); 391b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(SPARE2), 0ULL); 392b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(SPARE3), 0ULL); 393b25b33acSSukadev Bhattiprolu 394b25b33acSSukadev Bhattiprolu /* 395b25b33acSSukadev Bhattiprolu * NOTE: VAS expects the FIFO address to be copied into the LFIFO_BAR 396b25b33acSSukadev Bhattiprolu * register as is - do NOT shift the address into VAS_LFIFO_BAR 397b25b33acSSukadev Bhattiprolu * bit fields! Ok to set the page migration select fields - 398b25b33acSSukadev Bhattiprolu * VAS ignores the lower 10+ bits in the address anyway, because 399b25b33acSSukadev Bhattiprolu * the minimum FIFO size is 1K? 400b25b33acSSukadev Bhattiprolu * 401b25b33acSSukadev Bhattiprolu * See also: Design note in function header. 402b25b33acSSukadev Bhattiprolu */ 403b25b33acSSukadev Bhattiprolu val = __pa(winctx->rx_fifo); 404b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_PAGE_MIGRATION_SELECT, val, 0); 405b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LFIFO_BAR), val); 406b25b33acSSukadev Bhattiprolu 407b25b33acSSukadev Bhattiprolu val = 0ULL; 408b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LDATA_STAMP, val, winctx->data_stamp); 409b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LDATA_STAMP_CTL), val); 410b25b33acSSukadev Bhattiprolu 411b25b33acSSukadev Bhattiprolu val = 0ULL; 412b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LDMA_TYPE, val, winctx->dma_type); 413b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LDMA_FIFO_DISABLE, val, winctx->fifo_disable); 414b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LDMA_CACHE_CTL), val); 415b25b33acSSukadev Bhattiprolu 416b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LRFIFO_PUSH), 0ULL); 417b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(CURR_MSG_COUNT), 0ULL); 418b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_AFTER_COUNT), 0ULL); 419b25b33acSSukadev Bhattiprolu 420b25b33acSSukadev Bhattiprolu val = 0ULL; 421b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LRX_WCRED, val, winctx->wcreds_max); 422b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LRX_WCRED), val); 423b25b33acSSukadev Bhattiprolu 424b25b33acSSukadev Bhattiprolu val = 0ULL; 425b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_TX_WCRED, val, winctx->wcreds_max); 426b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(TX_WCRED), val); 427b25b33acSSukadev Bhattiprolu 428b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LRX_WCRED_ADDER), 0ULL); 429b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(TX_WCRED_ADDER), 0ULL); 430b25b33acSSukadev Bhattiprolu 431b25b33acSSukadev Bhattiprolu fifo_size = winctx->rx_fifo_size / 1024; 432b25b33acSSukadev Bhattiprolu 433b25b33acSSukadev Bhattiprolu val = 0ULL; 434b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LFIFO_SIZE, val, ilog2(fifo_size)); 435b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LFIFO_SIZE), val); 436b25b33acSSukadev Bhattiprolu 437b25b33acSSukadev Bhattiprolu /* Update window control and caching control registers last so 438b25b33acSSukadev Bhattiprolu * we mark the window open only after fully initializing it and 439b25b33acSSukadev Bhattiprolu * pushing context to cache. 440b25b33acSSukadev Bhattiprolu */ 441b25b33acSSukadev Bhattiprolu 442b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(WIN_STATUS), 0ULL); 443b25b33acSSukadev Bhattiprolu 444b25b33acSSukadev Bhattiprolu init_rsvd_tx_buf_count(window, winctx); 445b25b33acSSukadev Bhattiprolu 446b25b33acSSukadev Bhattiprolu /* for a send window, point to the matching receive window */ 447b25b33acSSukadev Bhattiprolu val = 0ULL; 448b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LRX_WIN_ID, val, winctx->rx_win_id); 449b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LRFIFO_WIN_PTR), val); 450b25b33acSSukadev Bhattiprolu 451b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(SPARE4), 0ULL); 452b25b33acSSukadev Bhattiprolu 453b25b33acSSukadev Bhattiprolu val = 0ULL; 454b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_NOTIFY_DISABLE, val, winctx->notify_disable); 455b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_INTR_DISABLE, val, winctx->intr_disable); 456b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_NOTIFY_EARLY, val, winctx->notify_early); 457b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_NOTIFY_OSU_INTR, val, winctx->notify_os_intr_reg); 458b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_CTL), val); 459b25b33acSSukadev Bhattiprolu 460b25b33acSSukadev Bhattiprolu val = 0ULL; 461b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LNOTIFY_PID, val, winctx->lnotify_pid); 462b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_PID), val); 463b25b33acSSukadev Bhattiprolu 464b25b33acSSukadev Bhattiprolu val = 0ULL; 465b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LNOTIFY_LPID, val, winctx->lnotify_lpid); 466b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_LPID), val); 467b25b33acSSukadev Bhattiprolu 468b25b33acSSukadev Bhattiprolu val = 0ULL; 469b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LNOTIFY_TID, val, winctx->lnotify_tid); 470b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_TID), val); 471b25b33acSSukadev Bhattiprolu 472b25b33acSSukadev Bhattiprolu val = 0ULL; 473b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LNOTIFY_MIN_SCOPE, val, winctx->min_scope); 474b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_LNOTIFY_MAX_SCOPE, val, winctx->max_scope); 475b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(LNOTIFY_SCOPE), val); 476b25b33acSSukadev Bhattiprolu 477b25b33acSSukadev Bhattiprolu /* Skip read-only registers NX_UTIL and NX_UTIL_SE */ 478b25b33acSSukadev Bhattiprolu 479b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(SPARE5), 0ULL); 480b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(NX_UTIL_ADDER), 0ULL); 481b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(SPARE6), 0ULL); 482b25b33acSSukadev Bhattiprolu 483b25b33acSSukadev Bhattiprolu /* Finally, push window context to memory and... */ 484b25b33acSSukadev Bhattiprolu val = 0ULL; 485b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_PUSH_TO_MEM, val, 1); 486b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(WIN_CTX_CACHING_CTL), val); 487b25b33acSSukadev Bhattiprolu 488b25b33acSSukadev Bhattiprolu /* ... mark the window open for business */ 489b25b33acSSukadev Bhattiprolu val = 0ULL; 490b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_REJ_NO_CREDIT, val, winctx->rej_no_credit); 491b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_PIN, val, winctx->pin_win); 492b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_TX_WCRED_MODE, val, winctx->tx_wcred_mode); 493b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_RX_WCRED_MODE, val, winctx->rx_wcred_mode); 494b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_TX_WORD_MODE, val, winctx->tx_word_mode); 495b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_RX_WORD_MODE, val, winctx->rx_word_mode); 496b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_FAULT_WIN, val, winctx->fault_win); 497b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_NX_WIN, val, winctx->nx_win); 498b25b33acSSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_OPEN, val, 1); 499b25b33acSSukadev Bhattiprolu write_hvwc_reg(window, VREG(WINCTL), val); 500b25b33acSSukadev Bhattiprolu 501b25b33acSSukadev Bhattiprolu return 0; 502b25b33acSSukadev Bhattiprolu } 503b25b33acSSukadev Bhattiprolu 504bbfe59f8SSukadev Bhattiprolu static void vas_release_window_id(struct ida *ida, int winid) 505bbfe59f8SSukadev Bhattiprolu { 506cd38049eSMatthew Wilcox ida_free(ida, winid); 507bbfe59f8SSukadev Bhattiprolu } 508bbfe59f8SSukadev Bhattiprolu 509bbfe59f8SSukadev Bhattiprolu static int vas_assign_window_id(struct ida *ida) 510bbfe59f8SSukadev Bhattiprolu { 511cd38049eSMatthew Wilcox int winid = ida_alloc_max(ida, VAS_WINDOWS_PER_CHIP - 1, GFP_KERNEL); 512bbfe59f8SSukadev Bhattiprolu 513cd38049eSMatthew Wilcox if (winid == -ENOSPC) { 514cd38049eSMatthew Wilcox pr_err("Too many (%d) open windows\n", VAS_WINDOWS_PER_CHIP); 515bbfe59f8SSukadev Bhattiprolu return -EAGAIN; 516bbfe59f8SSukadev Bhattiprolu } 517bbfe59f8SSukadev Bhattiprolu 518bbfe59f8SSukadev Bhattiprolu return winid; 519bbfe59f8SSukadev Bhattiprolu } 520bbfe59f8SSukadev Bhattiprolu 52198271d41SSukadev Bhattiprolu static void vas_window_free(struct vas_window *window) 522bbfe59f8SSukadev Bhattiprolu { 523bbfe59f8SSukadev Bhattiprolu int winid = window->winid; 524bbfe59f8SSukadev Bhattiprolu struct vas_instance *vinst = window->vinst; 525bbfe59f8SSukadev Bhattiprolu 526bbfe59f8SSukadev Bhattiprolu unmap_winctx_mmio_bars(window); 527ece4e512SSukadev Bhattiprolu 528ece4e512SSukadev Bhattiprolu vas_window_free_dbgdir(window); 529ece4e512SSukadev Bhattiprolu 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 554ece4e512SSukadev Bhattiprolu vas_window_init_dbgdir(window); 555ece4e512SSukadev Bhattiprolu 556bbfe59f8SSukadev Bhattiprolu return window; 557bbfe59f8SSukadev Bhattiprolu 558bbfe59f8SSukadev Bhattiprolu out_free: 559bbfe59f8SSukadev Bhattiprolu kfree(window); 560bbfe59f8SSukadev Bhattiprolu vas_release_window_id(&vinst->ida, winid); 561bbfe59f8SSukadev Bhattiprolu return ERR_PTR(-ENOMEM); 562bbfe59f8SSukadev Bhattiprolu } 563bbfe59f8SSukadev Bhattiprolu 56498271d41SSukadev Bhattiprolu static void put_rx_win(struct vas_window *rxwin) 56598271d41SSukadev Bhattiprolu { 56698271d41SSukadev Bhattiprolu /* Better not be a send window! */ 56798271d41SSukadev Bhattiprolu WARN_ON_ONCE(rxwin->tx_win); 56898271d41SSukadev Bhattiprolu 56998271d41SSukadev Bhattiprolu atomic_dec(&rxwin->num_txwins); 57098271d41SSukadev Bhattiprolu } 57198271d41SSukadev Bhattiprolu 57262c4eda4SSukadev Bhattiprolu /* 5736c8e6bb2SSukadev Bhattiprolu * Find the user space receive window given the @pswid. 5746c8e6bb2SSukadev Bhattiprolu * - We must have a valid vasid and it must belong to this instance. 5756c8e6bb2SSukadev Bhattiprolu * (so both send and receive windows are on the same VAS instance) 5766c8e6bb2SSukadev Bhattiprolu * - The window must refer to an OPEN, FTW, RECEIVE window. 5776c8e6bb2SSukadev Bhattiprolu * 5786c8e6bb2SSukadev Bhattiprolu * NOTE: We access ->windows[] table and assume that vinst->mutex is held. 5796c8e6bb2SSukadev Bhattiprolu */ 5806c8e6bb2SSukadev Bhattiprolu static struct vas_window *get_user_rxwin(struct vas_instance *vinst, u32 pswid) 5816c8e6bb2SSukadev Bhattiprolu { 5826c8e6bb2SSukadev Bhattiprolu int vasid, winid; 5836c8e6bb2SSukadev Bhattiprolu struct vas_window *rxwin; 5846c8e6bb2SSukadev Bhattiprolu 5856c8e6bb2SSukadev Bhattiprolu decode_pswid(pswid, &vasid, &winid); 5866c8e6bb2SSukadev Bhattiprolu 5876c8e6bb2SSukadev Bhattiprolu if (vinst->vas_id != vasid) 5886c8e6bb2SSukadev Bhattiprolu return ERR_PTR(-EINVAL); 5896c8e6bb2SSukadev Bhattiprolu 5906c8e6bb2SSukadev Bhattiprolu rxwin = vinst->windows[winid]; 5916c8e6bb2SSukadev Bhattiprolu 5926c8e6bb2SSukadev Bhattiprolu if (!rxwin || rxwin->tx_win || rxwin->cop != VAS_COP_TYPE_FTW) 5936c8e6bb2SSukadev Bhattiprolu return ERR_PTR(-EINVAL); 5946c8e6bb2SSukadev Bhattiprolu 5956c8e6bb2SSukadev Bhattiprolu return rxwin; 5966c8e6bb2SSukadev Bhattiprolu } 5976c8e6bb2SSukadev Bhattiprolu 5986c8e6bb2SSukadev Bhattiprolu /* 59962c4eda4SSukadev Bhattiprolu * Get the VAS receive window associated with NX engine identified 60062c4eda4SSukadev Bhattiprolu * by @cop and if applicable, @pswid. 60162c4eda4SSukadev Bhattiprolu * 60262c4eda4SSukadev Bhattiprolu * See also function header of set_vinst_win(). 60362c4eda4SSukadev Bhattiprolu */ 6045239af67SSukadev Bhattiprolu static struct vas_window *get_vinst_rxwin(struct vas_instance *vinst, 60562c4eda4SSukadev Bhattiprolu enum vas_cop_type cop, u32 pswid) 60662c4eda4SSukadev Bhattiprolu { 60762c4eda4SSukadev Bhattiprolu struct vas_window *rxwin; 60862c4eda4SSukadev Bhattiprolu 60962c4eda4SSukadev Bhattiprolu mutex_lock(&vinst->mutex); 61062c4eda4SSukadev Bhattiprolu 6116c8e6bb2SSukadev Bhattiprolu if (cop == VAS_COP_TYPE_FTW) 6126c8e6bb2SSukadev Bhattiprolu rxwin = get_user_rxwin(vinst, pswid); 61362c4eda4SSukadev Bhattiprolu else 6146c8e6bb2SSukadev Bhattiprolu rxwin = vinst->rxwin[cop] ?: ERR_PTR(-EINVAL); 61562c4eda4SSukadev Bhattiprolu 61662c4eda4SSukadev Bhattiprolu if (!IS_ERR(rxwin)) 61762c4eda4SSukadev Bhattiprolu atomic_inc(&rxwin->num_txwins); 61862c4eda4SSukadev Bhattiprolu 61962c4eda4SSukadev Bhattiprolu mutex_unlock(&vinst->mutex); 62062c4eda4SSukadev Bhattiprolu 62162c4eda4SSukadev Bhattiprolu return rxwin; 62262c4eda4SSukadev Bhattiprolu } 62362c4eda4SSukadev Bhattiprolu 62462c4eda4SSukadev Bhattiprolu /* 62562c4eda4SSukadev Bhattiprolu * We have two tables of windows in a VAS instance. The first one, 62662c4eda4SSukadev Bhattiprolu * ->windows[], contains all the windows in the instance and allows 62762c4eda4SSukadev Bhattiprolu * looking up a window by its id. It is used to look up send windows 62862c4eda4SSukadev Bhattiprolu * during fault handling and receive windows when pairing user space 62962c4eda4SSukadev Bhattiprolu * send/receive windows. 63062c4eda4SSukadev Bhattiprolu * 63162c4eda4SSukadev Bhattiprolu * The second table, ->rxwin[], contains receive windows that are 63262c4eda4SSukadev Bhattiprolu * associated with NX engines. This table has VAS_COP_TYPE_MAX 63362c4eda4SSukadev Bhattiprolu * entries and is used to look up a receive window by its 63462c4eda4SSukadev Bhattiprolu * coprocessor type. 63562c4eda4SSukadev Bhattiprolu * 63662c4eda4SSukadev Bhattiprolu * Here, we save @window in the ->windows[] table. If it is a receive 63762c4eda4SSukadev Bhattiprolu * window, we also save the window in the ->rxwin[] table. 63862c4eda4SSukadev Bhattiprolu */ 63962c4eda4SSukadev Bhattiprolu static void set_vinst_win(struct vas_instance *vinst, 64062c4eda4SSukadev Bhattiprolu struct vas_window *window) 64162c4eda4SSukadev Bhattiprolu { 64262c4eda4SSukadev Bhattiprolu int id = window->winid; 64362c4eda4SSukadev Bhattiprolu 64462c4eda4SSukadev Bhattiprolu mutex_lock(&vinst->mutex); 64562c4eda4SSukadev Bhattiprolu 64662c4eda4SSukadev Bhattiprolu /* 64762c4eda4SSukadev Bhattiprolu * There should only be one receive window for a coprocessor type 64862c4eda4SSukadev Bhattiprolu * unless its a user (FTW) window. 64962c4eda4SSukadev Bhattiprolu */ 65062c4eda4SSukadev Bhattiprolu if (!window->user_win && !window->tx_win) { 65162c4eda4SSukadev Bhattiprolu WARN_ON_ONCE(vinst->rxwin[window->cop]); 65262c4eda4SSukadev Bhattiprolu vinst->rxwin[window->cop] = window; 65362c4eda4SSukadev Bhattiprolu } 65462c4eda4SSukadev Bhattiprolu 65562c4eda4SSukadev Bhattiprolu WARN_ON_ONCE(vinst->windows[id] != NULL); 65662c4eda4SSukadev Bhattiprolu vinst->windows[id] = window; 65762c4eda4SSukadev Bhattiprolu 65862c4eda4SSukadev Bhattiprolu mutex_unlock(&vinst->mutex); 65962c4eda4SSukadev Bhattiprolu } 66062c4eda4SSukadev Bhattiprolu 66162c4eda4SSukadev Bhattiprolu /* 66262c4eda4SSukadev Bhattiprolu * Clear this window from the table(s) of windows for this VAS instance. 66362c4eda4SSukadev Bhattiprolu * See also function header of set_vinst_win(). 66462c4eda4SSukadev Bhattiprolu */ 66598271d41SSukadev Bhattiprolu static void clear_vinst_win(struct vas_window *window) 66662c4eda4SSukadev Bhattiprolu { 66762c4eda4SSukadev Bhattiprolu int id = window->winid; 66862c4eda4SSukadev Bhattiprolu struct vas_instance *vinst = window->vinst; 66962c4eda4SSukadev Bhattiprolu 67062c4eda4SSukadev Bhattiprolu mutex_lock(&vinst->mutex); 67162c4eda4SSukadev Bhattiprolu 67262c4eda4SSukadev Bhattiprolu if (!window->user_win && !window->tx_win) { 67362c4eda4SSukadev Bhattiprolu WARN_ON_ONCE(!vinst->rxwin[window->cop]); 67462c4eda4SSukadev Bhattiprolu vinst->rxwin[window->cop] = NULL; 67562c4eda4SSukadev Bhattiprolu } 67662c4eda4SSukadev Bhattiprolu 67762c4eda4SSukadev Bhattiprolu WARN_ON_ONCE(vinst->windows[id] != window); 67862c4eda4SSukadev Bhattiprolu vinst->windows[id] = NULL; 67962c4eda4SSukadev Bhattiprolu 68062c4eda4SSukadev Bhattiprolu mutex_unlock(&vinst->mutex); 68162c4eda4SSukadev Bhattiprolu } 68262c4eda4SSukadev Bhattiprolu 68362c4eda4SSukadev Bhattiprolu static void init_winctx_for_rxwin(struct vas_window *rxwin, 68462c4eda4SSukadev Bhattiprolu struct vas_rx_win_attr *rxattr, 68562c4eda4SSukadev Bhattiprolu struct vas_winctx *winctx) 68662c4eda4SSukadev Bhattiprolu { 68762c4eda4SSukadev Bhattiprolu /* 68862c4eda4SSukadev Bhattiprolu * We first zero (memset()) all fields and only set non-zero fields. 68962c4eda4SSukadev Bhattiprolu * Following fields are 0/false but maybe deserve a comment: 69062c4eda4SSukadev Bhattiprolu * 69162c4eda4SSukadev Bhattiprolu * ->notify_os_intr_reg In powerNV, send intrs to HV 69262c4eda4SSukadev Bhattiprolu * ->notify_disable False for NX windows 69362c4eda4SSukadev Bhattiprolu * ->intr_disable False for Fault Windows 69462c4eda4SSukadev Bhattiprolu * ->xtra_write False for NX windows 69562c4eda4SSukadev Bhattiprolu * ->notify_early NA for NX windows 69662c4eda4SSukadev Bhattiprolu * ->rsvd_txbuf_count NA for Rx windows 69762c4eda4SSukadev Bhattiprolu * ->lpid, ->pid, ->tid NA for Rx windows 69862c4eda4SSukadev Bhattiprolu */ 69962c4eda4SSukadev Bhattiprolu 70062c4eda4SSukadev Bhattiprolu memset(winctx, 0, sizeof(struct vas_winctx)); 70162c4eda4SSukadev Bhattiprolu 70262c4eda4SSukadev Bhattiprolu winctx->rx_fifo = rxattr->rx_fifo; 70362c4eda4SSukadev Bhattiprolu winctx->rx_fifo_size = rxattr->rx_fifo_size; 70462f659e0SSukadev Bhattiprolu winctx->wcreds_max = rxwin->wcreds_max; 70562c4eda4SSukadev Bhattiprolu winctx->pin_win = rxattr->pin_win; 70662c4eda4SSukadev Bhattiprolu 70762c4eda4SSukadev Bhattiprolu winctx->nx_win = rxattr->nx_win; 70862c4eda4SSukadev Bhattiprolu winctx->fault_win = rxattr->fault_win; 709e34917fbSSukadev Bhattiprolu winctx->user_win = rxattr->user_win; 710e34917fbSSukadev Bhattiprolu winctx->rej_no_credit = rxattr->rej_no_credit; 71162c4eda4SSukadev Bhattiprolu winctx->rx_word_mode = rxattr->rx_win_ord_mode; 71262c4eda4SSukadev Bhattiprolu winctx->tx_word_mode = rxattr->tx_win_ord_mode; 71362c4eda4SSukadev Bhattiprolu winctx->rx_wcred_mode = rxattr->rx_wcred_mode; 71462c4eda4SSukadev Bhattiprolu winctx->tx_wcred_mode = rxattr->tx_wcred_mode; 715e34917fbSSukadev Bhattiprolu winctx->notify_early = rxattr->notify_early; 71662c4eda4SSukadev Bhattiprolu 71762c4eda4SSukadev Bhattiprolu if (winctx->nx_win) { 71862c4eda4SSukadev Bhattiprolu winctx->data_stamp = true; 71962c4eda4SSukadev Bhattiprolu winctx->intr_disable = true; 72062c4eda4SSukadev Bhattiprolu winctx->pin_win = true; 72162c4eda4SSukadev Bhattiprolu 72262c4eda4SSukadev Bhattiprolu WARN_ON_ONCE(winctx->fault_win); 72362c4eda4SSukadev Bhattiprolu WARN_ON_ONCE(!winctx->rx_word_mode); 72462c4eda4SSukadev Bhattiprolu WARN_ON_ONCE(!winctx->tx_word_mode); 72562c4eda4SSukadev Bhattiprolu WARN_ON_ONCE(winctx->notify_after_count); 72662c4eda4SSukadev Bhattiprolu } else if (winctx->fault_win) { 72762c4eda4SSukadev Bhattiprolu winctx->notify_disable = true; 72862c4eda4SSukadev Bhattiprolu } else if (winctx->user_win) { 72962c4eda4SSukadev Bhattiprolu /* 73062c4eda4SSukadev Bhattiprolu * Section 1.8.1 Low Latency Core-Core Wake up of 73162c4eda4SSukadev Bhattiprolu * the VAS workbook: 73262c4eda4SSukadev Bhattiprolu * 73362c4eda4SSukadev Bhattiprolu * - disable credit checks ([tr]x_wcred_mode = false) 73462c4eda4SSukadev Bhattiprolu * - disable FIFO writes 73562c4eda4SSukadev Bhattiprolu * - enable ASB_Notify, disable interrupt 73662c4eda4SSukadev Bhattiprolu */ 73762c4eda4SSukadev Bhattiprolu winctx->fifo_disable = true; 73862c4eda4SSukadev Bhattiprolu winctx->intr_disable = true; 73962c4eda4SSukadev Bhattiprolu winctx->rx_fifo = NULL; 74062c4eda4SSukadev Bhattiprolu } 74162c4eda4SSukadev Bhattiprolu 74262c4eda4SSukadev Bhattiprolu winctx->lnotify_lpid = rxattr->lnotify_lpid; 74362c4eda4SSukadev Bhattiprolu winctx->lnotify_pid = rxattr->lnotify_pid; 74462c4eda4SSukadev Bhattiprolu winctx->lnotify_tid = rxattr->lnotify_tid; 74562c4eda4SSukadev Bhattiprolu winctx->pswid = rxattr->pswid; 74662c4eda4SSukadev Bhattiprolu winctx->dma_type = VAS_DMA_TYPE_INJECT; 74762c4eda4SSukadev Bhattiprolu winctx->tc_mode = rxattr->tc_mode; 74862c4eda4SSukadev Bhattiprolu 74962c4eda4SSukadev Bhattiprolu winctx->min_scope = VAS_SCOPE_LOCAL; 75062c4eda4SSukadev Bhattiprolu winctx->max_scope = VAS_SCOPE_VECTORED_GROUP; 75162c4eda4SSukadev Bhattiprolu } 75262c4eda4SSukadev Bhattiprolu 75362c4eda4SSukadev Bhattiprolu static bool rx_win_args_valid(enum vas_cop_type cop, 75462c4eda4SSukadev Bhattiprolu struct vas_rx_win_attr *attr) 75562c4eda4SSukadev Bhattiprolu { 7560a2c2c24SSukadev Bhattiprolu pr_debug("Rxattr: fault %d, notify %d, intr %d, early %d, fifo %d\n", 7570a2c2c24SSukadev Bhattiprolu attr->fault_win, attr->notify_disable, 7580a2c2c24SSukadev Bhattiprolu attr->intr_disable, attr->notify_early, 7590a2c2c24SSukadev Bhattiprolu attr->rx_fifo_size); 76062c4eda4SSukadev Bhattiprolu 76162c4eda4SSukadev Bhattiprolu if (cop >= VAS_COP_TYPE_MAX) 76262c4eda4SSukadev Bhattiprolu return false; 76362c4eda4SSukadev Bhattiprolu 76462c4eda4SSukadev Bhattiprolu if (cop != VAS_COP_TYPE_FTW && 76562c4eda4SSukadev Bhattiprolu attr->rx_fifo_size < VAS_RX_FIFO_SIZE_MIN) 76662c4eda4SSukadev Bhattiprolu return false; 76762c4eda4SSukadev Bhattiprolu 76862c4eda4SSukadev Bhattiprolu if (attr->rx_fifo_size > VAS_RX_FIFO_SIZE_MAX) 76962c4eda4SSukadev Bhattiprolu return false; 77062c4eda4SSukadev Bhattiprolu 77151b53712SSukadev Bhattiprolu if (attr->wcreds_max > VAS_RX_WCREDS_MAX) 77251b53712SSukadev Bhattiprolu return false; 77351b53712SSukadev Bhattiprolu 77462c4eda4SSukadev Bhattiprolu if (attr->nx_win) { 77562c4eda4SSukadev Bhattiprolu /* cannot be fault or user window if it is nx */ 77662c4eda4SSukadev Bhattiprolu if (attr->fault_win || attr->user_win) 77762c4eda4SSukadev Bhattiprolu return false; 77862c4eda4SSukadev Bhattiprolu /* 77962c4eda4SSukadev Bhattiprolu * Section 3.1.4.32: NX Windows must not disable notification, 78062c4eda4SSukadev Bhattiprolu * and must not enable interrupts or early notification. 78162c4eda4SSukadev Bhattiprolu */ 78262c4eda4SSukadev Bhattiprolu if (attr->notify_disable || !attr->intr_disable || 78362c4eda4SSukadev Bhattiprolu attr->notify_early) 78462c4eda4SSukadev Bhattiprolu return false; 78562c4eda4SSukadev Bhattiprolu } else if (attr->fault_win) { 78662c4eda4SSukadev Bhattiprolu /* cannot be both fault and user window */ 78762c4eda4SSukadev Bhattiprolu if (attr->user_win) 78862c4eda4SSukadev Bhattiprolu return false; 78962c4eda4SSukadev Bhattiprolu 79062c4eda4SSukadev Bhattiprolu /* 79162c4eda4SSukadev Bhattiprolu * Section 3.1.4.32: Fault windows must disable notification 79262c4eda4SSukadev Bhattiprolu * but not interrupts. 79362c4eda4SSukadev Bhattiprolu */ 79462c4eda4SSukadev Bhattiprolu if (!attr->notify_disable || attr->intr_disable) 79562c4eda4SSukadev Bhattiprolu return false; 79662c4eda4SSukadev Bhattiprolu 79762c4eda4SSukadev Bhattiprolu } else if (attr->user_win) { 79862c4eda4SSukadev Bhattiprolu /* 79962c4eda4SSukadev Bhattiprolu * User receive windows are only for fast-thread-wakeup 80062c4eda4SSukadev Bhattiprolu * (FTW). They don't need a FIFO and must disable interrupts 80162c4eda4SSukadev Bhattiprolu */ 80262c4eda4SSukadev Bhattiprolu if (attr->rx_fifo || attr->rx_fifo_size || !attr->intr_disable) 80362c4eda4SSukadev Bhattiprolu return false; 80462c4eda4SSukadev Bhattiprolu } else { 80562c4eda4SSukadev Bhattiprolu /* Rx window must be one of NX or Fault or User window. */ 80662c4eda4SSukadev Bhattiprolu return false; 80762c4eda4SSukadev Bhattiprolu } 80862c4eda4SSukadev Bhattiprolu 80962c4eda4SSukadev Bhattiprolu return true; 81062c4eda4SSukadev Bhattiprolu } 81162c4eda4SSukadev Bhattiprolu 81262c4eda4SSukadev Bhattiprolu void vas_init_rx_win_attr(struct vas_rx_win_attr *rxattr, enum vas_cop_type cop) 81362c4eda4SSukadev Bhattiprolu { 81462c4eda4SSukadev Bhattiprolu memset(rxattr, 0, sizeof(*rxattr)); 81562c4eda4SSukadev Bhattiprolu 81662c4eda4SSukadev Bhattiprolu if (cop == VAS_COP_TYPE_842 || cop == VAS_COP_TYPE_842_HIPRI) { 81762c4eda4SSukadev Bhattiprolu rxattr->pin_win = true; 81862c4eda4SSukadev Bhattiprolu rxattr->nx_win = true; 81962c4eda4SSukadev Bhattiprolu rxattr->fault_win = false; 82062c4eda4SSukadev Bhattiprolu rxattr->intr_disable = true; 82162c4eda4SSukadev Bhattiprolu rxattr->rx_wcred_mode = true; 82262c4eda4SSukadev Bhattiprolu rxattr->tx_wcred_mode = true; 82362c4eda4SSukadev Bhattiprolu rxattr->rx_win_ord_mode = true; 82462c4eda4SSukadev Bhattiprolu rxattr->tx_win_ord_mode = true; 82562c4eda4SSukadev Bhattiprolu } else if (cop == VAS_COP_TYPE_FAULT) { 82662c4eda4SSukadev Bhattiprolu rxattr->pin_win = true; 82762c4eda4SSukadev Bhattiprolu rxattr->fault_win = true; 82862c4eda4SSukadev Bhattiprolu rxattr->notify_disable = true; 82962c4eda4SSukadev Bhattiprolu rxattr->rx_wcred_mode = true; 83062c4eda4SSukadev Bhattiprolu rxattr->rx_win_ord_mode = true; 8310d17de03SHaren Myneni rxattr->rej_no_credit = true; 8320d17de03SHaren Myneni rxattr->tc_mode = VAS_THRESH_DISABLED; 83362c4eda4SSukadev Bhattiprolu } else if (cop == VAS_COP_TYPE_FTW) { 83462c4eda4SSukadev Bhattiprolu rxattr->user_win = true; 83562c4eda4SSukadev Bhattiprolu rxattr->intr_disable = true; 83662c4eda4SSukadev Bhattiprolu 83762c4eda4SSukadev Bhattiprolu /* 83862c4eda4SSukadev Bhattiprolu * As noted in the VAS Workbook we disable credit checks. 83962c4eda4SSukadev Bhattiprolu * If we enable credit checks in the future, we must also 84062c4eda4SSukadev Bhattiprolu * implement a mechanism to return the user credits or new 84162c4eda4SSukadev Bhattiprolu * paste operations will fail. 84262c4eda4SSukadev Bhattiprolu */ 84362c4eda4SSukadev Bhattiprolu } 84462c4eda4SSukadev Bhattiprolu } 84562c4eda4SSukadev Bhattiprolu EXPORT_SYMBOL_GPL(vas_init_rx_win_attr); 84662c4eda4SSukadev Bhattiprolu 84762c4eda4SSukadev Bhattiprolu struct vas_window *vas_rx_win_open(int vasid, enum vas_cop_type cop, 84862c4eda4SSukadev Bhattiprolu struct vas_rx_win_attr *rxattr) 84962c4eda4SSukadev Bhattiprolu { 85062c4eda4SSukadev Bhattiprolu struct vas_window *rxwin; 85162c4eda4SSukadev Bhattiprolu struct vas_winctx winctx; 85262c4eda4SSukadev Bhattiprolu struct vas_instance *vinst; 85362c4eda4SSukadev Bhattiprolu 854007bb7d6SSukadev Bhattiprolu trace_vas_rx_win_open(current, vasid, cop, rxattr); 855007bb7d6SSukadev Bhattiprolu 85662c4eda4SSukadev Bhattiprolu if (!rx_win_args_valid(cop, rxattr)) 85762c4eda4SSukadev Bhattiprolu return ERR_PTR(-EINVAL); 85862c4eda4SSukadev Bhattiprolu 85962c4eda4SSukadev Bhattiprolu vinst = find_vas_instance(vasid); 86062c4eda4SSukadev Bhattiprolu if (!vinst) { 86162c4eda4SSukadev Bhattiprolu pr_devel("vasid %d not found!\n", vasid); 86262c4eda4SSukadev Bhattiprolu return ERR_PTR(-EINVAL); 86362c4eda4SSukadev Bhattiprolu } 86462c4eda4SSukadev Bhattiprolu pr_devel("Found instance %d\n", vasid); 86562c4eda4SSukadev Bhattiprolu 86662c4eda4SSukadev Bhattiprolu rxwin = vas_window_alloc(vinst); 86762c4eda4SSukadev Bhattiprolu if (IS_ERR(rxwin)) { 86862c4eda4SSukadev Bhattiprolu pr_devel("Unable to allocate memory for Rx window\n"); 86962c4eda4SSukadev Bhattiprolu return rxwin; 87062c4eda4SSukadev Bhattiprolu } 87162c4eda4SSukadev Bhattiprolu 87262c4eda4SSukadev Bhattiprolu rxwin->tx_win = false; 87362c4eda4SSukadev Bhattiprolu rxwin->nx_win = rxattr->nx_win; 87462c4eda4SSukadev Bhattiprolu rxwin->user_win = rxattr->user_win; 87562c4eda4SSukadev Bhattiprolu rxwin->cop = cop; 87662f659e0SSukadev Bhattiprolu rxwin->wcreds_max = rxattr->wcreds_max ?: VAS_WCREDS_DEFAULT; 87762c4eda4SSukadev Bhattiprolu if (rxattr->user_win) 87862c4eda4SSukadev Bhattiprolu rxwin->pid = task_pid_vnr(current); 87962c4eda4SSukadev Bhattiprolu 88062c4eda4SSukadev Bhattiprolu init_winctx_for_rxwin(rxwin, rxattr, &winctx); 88162c4eda4SSukadev Bhattiprolu init_winctx_regs(rxwin, &winctx); 88262c4eda4SSukadev Bhattiprolu 88362c4eda4SSukadev Bhattiprolu set_vinst_win(vinst, rxwin); 88462c4eda4SSukadev Bhattiprolu 88562c4eda4SSukadev Bhattiprolu return rxwin; 88662c4eda4SSukadev Bhattiprolu } 88762c4eda4SSukadev Bhattiprolu EXPORT_SYMBOL_GPL(vas_rx_win_open); 88862c4eda4SSukadev Bhattiprolu 8895239af67SSukadev Bhattiprolu void vas_init_tx_win_attr(struct vas_tx_win_attr *txattr, enum vas_cop_type cop) 8905239af67SSukadev Bhattiprolu { 8915239af67SSukadev Bhattiprolu memset(txattr, 0, sizeof(*txattr)); 8925239af67SSukadev Bhattiprolu 8935239af67SSukadev Bhattiprolu if (cop == VAS_COP_TYPE_842 || cop == VAS_COP_TYPE_842_HIPRI) { 8945239af67SSukadev Bhattiprolu txattr->rej_no_credit = false; 8955239af67SSukadev Bhattiprolu txattr->rx_wcred_mode = true; 8965239af67SSukadev Bhattiprolu txattr->tx_wcred_mode = true; 8975239af67SSukadev Bhattiprolu txattr->rx_win_ord_mode = true; 8985239af67SSukadev Bhattiprolu txattr->tx_win_ord_mode = true; 8995239af67SSukadev Bhattiprolu } else if (cop == VAS_COP_TYPE_FTW) { 9005239af67SSukadev Bhattiprolu txattr->user_win = true; 9015239af67SSukadev Bhattiprolu } 9025239af67SSukadev Bhattiprolu } 9035239af67SSukadev Bhattiprolu EXPORT_SYMBOL_GPL(vas_init_tx_win_attr); 9045239af67SSukadev Bhattiprolu 9055239af67SSukadev Bhattiprolu static void init_winctx_for_txwin(struct vas_window *txwin, 9065239af67SSukadev Bhattiprolu struct vas_tx_win_attr *txattr, 9075239af67SSukadev Bhattiprolu struct vas_winctx *winctx) 9085239af67SSukadev Bhattiprolu { 9095239af67SSukadev Bhattiprolu /* 9105239af67SSukadev Bhattiprolu * We first zero all fields and only set non-zero ones. Following 9115239af67SSukadev Bhattiprolu * are some fields set to 0/false for the stated reason: 9125239af67SSukadev Bhattiprolu * 9135239af67SSukadev Bhattiprolu * ->notify_os_intr_reg In powernv, send intrs to HV 9145239af67SSukadev Bhattiprolu * ->rsvd_txbuf_count Not supported yet. 9155239af67SSukadev Bhattiprolu * ->notify_disable False for NX windows 9165239af67SSukadev Bhattiprolu * ->xtra_write False for NX windows 9175239af67SSukadev Bhattiprolu * ->notify_early NA for NX windows 9185239af67SSukadev Bhattiprolu * ->lnotify_lpid NA for Tx windows 9195239af67SSukadev Bhattiprolu * ->lnotify_pid NA for Tx windows 9205239af67SSukadev Bhattiprolu * ->lnotify_tid NA for Tx windows 9215239af67SSukadev Bhattiprolu * ->tx_win_cred_mode Ignore for now for NX windows 9225239af67SSukadev Bhattiprolu * ->rx_win_cred_mode Ignore for now for NX windows 9235239af67SSukadev Bhattiprolu */ 9245239af67SSukadev Bhattiprolu memset(winctx, 0, sizeof(struct vas_winctx)); 9255239af67SSukadev Bhattiprolu 92662f659e0SSukadev Bhattiprolu winctx->wcreds_max = txwin->wcreds_max; 9275239af67SSukadev Bhattiprolu 9285239af67SSukadev Bhattiprolu winctx->user_win = txattr->user_win; 9295239af67SSukadev Bhattiprolu winctx->nx_win = txwin->rxwin->nx_win; 9305239af67SSukadev Bhattiprolu winctx->pin_win = txattr->pin_win; 931e34917fbSSukadev Bhattiprolu winctx->rej_no_credit = txattr->rej_no_credit; 932e34917fbSSukadev Bhattiprolu winctx->rsvd_txbuf_enable = txattr->rsvd_txbuf_enable; 9335239af67SSukadev Bhattiprolu 9345239af67SSukadev Bhattiprolu winctx->rx_wcred_mode = txattr->rx_wcred_mode; 9355239af67SSukadev Bhattiprolu winctx->tx_wcred_mode = txattr->tx_wcred_mode; 9365239af67SSukadev Bhattiprolu winctx->rx_word_mode = txattr->rx_win_ord_mode; 9375239af67SSukadev Bhattiprolu winctx->tx_word_mode = txattr->tx_win_ord_mode; 938e34917fbSSukadev Bhattiprolu winctx->rsvd_txbuf_count = txattr->rsvd_txbuf_count; 9395239af67SSukadev Bhattiprolu 9405239af67SSukadev Bhattiprolu winctx->intr_disable = true; 9416c8e6bb2SSukadev Bhattiprolu if (winctx->nx_win) 9426c8e6bb2SSukadev Bhattiprolu winctx->data_stamp = true; 9435239af67SSukadev Bhattiprolu 9445239af67SSukadev Bhattiprolu winctx->lpid = txattr->lpid; 9455239af67SSukadev Bhattiprolu winctx->pidr = txattr->pidr; 9465239af67SSukadev Bhattiprolu winctx->rx_win_id = txwin->rxwin->winid; 9475239af67SSukadev Bhattiprolu 9485239af67SSukadev Bhattiprolu winctx->dma_type = VAS_DMA_TYPE_INJECT; 9495239af67SSukadev Bhattiprolu winctx->tc_mode = txattr->tc_mode; 9505239af67SSukadev Bhattiprolu winctx->min_scope = VAS_SCOPE_LOCAL; 9515239af67SSukadev Bhattiprolu winctx->max_scope = VAS_SCOPE_VECTORED_GROUP; 9525239af67SSukadev Bhattiprolu 9535239af67SSukadev Bhattiprolu winctx->pswid = 0; 9545239af67SSukadev Bhattiprolu } 9555239af67SSukadev Bhattiprolu 9565239af67SSukadev Bhattiprolu static bool tx_win_args_valid(enum vas_cop_type cop, 9575239af67SSukadev Bhattiprolu struct vas_tx_win_attr *attr) 9585239af67SSukadev Bhattiprolu { 9595239af67SSukadev Bhattiprolu if (attr->tc_mode != VAS_THRESH_DISABLED) 9605239af67SSukadev Bhattiprolu return false; 9615239af67SSukadev Bhattiprolu 9625239af67SSukadev Bhattiprolu if (cop > VAS_COP_TYPE_MAX) 9635239af67SSukadev Bhattiprolu return false; 9645239af67SSukadev Bhattiprolu 96551b53712SSukadev Bhattiprolu if (attr->wcreds_max > VAS_TX_WCREDS_MAX) 96651b53712SSukadev Bhattiprolu return false; 96751b53712SSukadev Bhattiprolu 9685239af67SSukadev Bhattiprolu if (attr->user_win && 9695239af67SSukadev Bhattiprolu (cop != VAS_COP_TYPE_FTW || attr->rsvd_txbuf_count)) 9705239af67SSukadev Bhattiprolu return false; 9715239af67SSukadev Bhattiprolu 9725239af67SSukadev Bhattiprolu return true; 9735239af67SSukadev Bhattiprolu } 9745239af67SSukadev Bhattiprolu 9755239af67SSukadev Bhattiprolu struct vas_window *vas_tx_win_open(int vasid, enum vas_cop_type cop, 9765239af67SSukadev Bhattiprolu struct vas_tx_win_attr *attr) 9775239af67SSukadev Bhattiprolu { 9785239af67SSukadev Bhattiprolu int rc; 9795239af67SSukadev Bhattiprolu struct vas_window *txwin; 9805239af67SSukadev Bhattiprolu struct vas_window *rxwin; 9815239af67SSukadev Bhattiprolu struct vas_winctx winctx; 9825239af67SSukadev Bhattiprolu struct vas_instance *vinst; 9835239af67SSukadev Bhattiprolu 984007bb7d6SSukadev Bhattiprolu trace_vas_tx_win_open(current, vasid, cop, attr); 985007bb7d6SSukadev Bhattiprolu 9865239af67SSukadev Bhattiprolu if (!tx_win_args_valid(cop, attr)) 9875239af67SSukadev Bhattiprolu return ERR_PTR(-EINVAL); 9885239af67SSukadev Bhattiprolu 9896c8e6bb2SSukadev Bhattiprolu /* 9906c8e6bb2SSukadev Bhattiprolu * If caller did not specify a vasid but specified the PSWID of a 9916c8e6bb2SSukadev Bhattiprolu * receive window (applicable only to FTW windows), use the vasid 9926c8e6bb2SSukadev Bhattiprolu * from that receive window. 9936c8e6bb2SSukadev Bhattiprolu */ 9946c8e6bb2SSukadev Bhattiprolu if (vasid == -1 && attr->pswid) 9956c8e6bb2SSukadev Bhattiprolu decode_pswid(attr->pswid, &vasid, NULL); 9966c8e6bb2SSukadev Bhattiprolu 9975239af67SSukadev Bhattiprolu vinst = find_vas_instance(vasid); 9985239af67SSukadev Bhattiprolu if (!vinst) { 9995239af67SSukadev Bhattiprolu pr_devel("vasid %d not found!\n", vasid); 10005239af67SSukadev Bhattiprolu return ERR_PTR(-EINVAL); 10015239af67SSukadev Bhattiprolu } 10025239af67SSukadev Bhattiprolu 10035239af67SSukadev Bhattiprolu rxwin = get_vinst_rxwin(vinst, cop, attr->pswid); 10045239af67SSukadev Bhattiprolu if (IS_ERR(rxwin)) { 10055239af67SSukadev Bhattiprolu pr_devel("No RxWin for vasid %d, cop %d\n", vasid, cop); 10065239af67SSukadev Bhattiprolu return rxwin; 10075239af67SSukadev Bhattiprolu } 10085239af67SSukadev Bhattiprolu 10095239af67SSukadev Bhattiprolu txwin = vas_window_alloc(vinst); 10105239af67SSukadev Bhattiprolu if (IS_ERR(txwin)) { 10115239af67SSukadev Bhattiprolu rc = PTR_ERR(txwin); 10125239af67SSukadev Bhattiprolu goto put_rxwin; 10135239af67SSukadev Bhattiprolu } 10145239af67SSukadev Bhattiprolu 1015ece4e512SSukadev Bhattiprolu txwin->cop = cop; 10165239af67SSukadev Bhattiprolu txwin->tx_win = 1; 10175239af67SSukadev Bhattiprolu txwin->rxwin = rxwin; 10185239af67SSukadev Bhattiprolu txwin->nx_win = txwin->rxwin->nx_win; 10195239af67SSukadev Bhattiprolu txwin->pid = attr->pid; 10205239af67SSukadev Bhattiprolu txwin->user_win = attr->user_win; 102162f659e0SSukadev Bhattiprolu txwin->wcreds_max = attr->wcreds_max ?: VAS_WCREDS_DEFAULT; 10225239af67SSukadev Bhattiprolu 10235239af67SSukadev Bhattiprolu init_winctx_for_txwin(txwin, attr, &winctx); 10245239af67SSukadev Bhattiprolu 10255239af67SSukadev Bhattiprolu init_winctx_regs(txwin, &winctx); 10265239af67SSukadev Bhattiprolu 10275239af67SSukadev Bhattiprolu /* 10285239af67SSukadev Bhattiprolu * If its a kernel send window, map the window address into the 10295239af67SSukadev Bhattiprolu * kernel's address space. For user windows, user must issue an 10305239af67SSukadev Bhattiprolu * mmap() to map the window into their address space. 10315239af67SSukadev Bhattiprolu * 10325239af67SSukadev Bhattiprolu * NOTE: If kernel ever resubmits a user CRB after handling a page 10335239af67SSukadev Bhattiprolu * fault, we will need to map this into kernel as well. 10345239af67SSukadev Bhattiprolu */ 10355239af67SSukadev Bhattiprolu if (!txwin->user_win) { 10365239af67SSukadev Bhattiprolu txwin->paste_kaddr = map_paste_region(txwin); 10375239af67SSukadev Bhattiprolu if (IS_ERR(txwin->paste_kaddr)) { 10385239af67SSukadev Bhattiprolu rc = PTR_ERR(txwin->paste_kaddr); 10395239af67SSukadev Bhattiprolu goto free_window; 10405239af67SSukadev Bhattiprolu } 1041b00b6289SNicholas Piggin } else { 10426c8e6bb2SSukadev Bhattiprolu /* 1043b00b6289SNicholas Piggin * A user mapping must ensure that context switch issues 10446c8e6bb2SSukadev Bhattiprolu * CP_ABORT for this thread. 10456c8e6bb2SSukadev Bhattiprolu */ 1046b00b6289SNicholas Piggin rc = set_thread_uses_vas(); 1047b00b6289SNicholas Piggin if (rc) 10486c8e6bb2SSukadev Bhattiprolu goto free_window; 1049b00b6289SNicholas Piggin } 10506c8e6bb2SSukadev Bhattiprolu 10515239af67SSukadev Bhattiprolu set_vinst_win(vinst, txwin); 10525239af67SSukadev Bhattiprolu 10535239af67SSukadev Bhattiprolu return txwin; 10545239af67SSukadev Bhattiprolu 10555239af67SSukadev Bhattiprolu free_window: 10565239af67SSukadev Bhattiprolu vas_window_free(txwin); 10575239af67SSukadev Bhattiprolu 10585239af67SSukadev Bhattiprolu put_rxwin: 10595239af67SSukadev Bhattiprolu put_rx_win(rxwin); 10605239af67SSukadev Bhattiprolu return ERR_PTR(rc); 10615239af67SSukadev Bhattiprolu 10625239af67SSukadev Bhattiprolu } 10635239af67SSukadev Bhattiprolu EXPORT_SYMBOL_GPL(vas_tx_win_open); 10645239af67SSukadev Bhattiprolu 10652392c8c8SSukadev Bhattiprolu int vas_copy_crb(void *crb, int offset) 10662392c8c8SSukadev Bhattiprolu { 10672392c8c8SSukadev Bhattiprolu return vas_copy(crb, offset); 10682392c8c8SSukadev Bhattiprolu } 10692392c8c8SSukadev Bhattiprolu EXPORT_SYMBOL_GPL(vas_copy_crb); 10702392c8c8SSukadev Bhattiprolu 10712392c8c8SSukadev Bhattiprolu #define RMA_LSMP_REPORT_ENABLE PPC_BIT(53) 10722392c8c8SSukadev Bhattiprolu int vas_paste_crb(struct vas_window *txwin, int offset, bool re) 10732392c8c8SSukadev Bhattiprolu { 10742392c8c8SSukadev Bhattiprolu int rc; 10752392c8c8SSukadev Bhattiprolu void *addr; 10762392c8c8SSukadev Bhattiprolu uint64_t val; 10772392c8c8SSukadev Bhattiprolu 1078007bb7d6SSukadev Bhattiprolu trace_vas_paste_crb(current, txwin); 1079007bb7d6SSukadev Bhattiprolu 10802392c8c8SSukadev Bhattiprolu /* 10812392c8c8SSukadev Bhattiprolu * Only NX windows are supported for now and hardware assumes 10822392c8c8SSukadev Bhattiprolu * report-enable flag is set for NX windows. Ensure software 10832392c8c8SSukadev Bhattiprolu * complies too. 10842392c8c8SSukadev Bhattiprolu */ 10852392c8c8SSukadev Bhattiprolu WARN_ON_ONCE(txwin->nx_win && !re); 10862392c8c8SSukadev Bhattiprolu 10872392c8c8SSukadev Bhattiprolu addr = txwin->paste_kaddr; 10882392c8c8SSukadev Bhattiprolu if (re) { 10892392c8c8SSukadev Bhattiprolu /* 10902392c8c8SSukadev Bhattiprolu * Set the REPORT_ENABLE bit (equivalent to writing 10912392c8c8SSukadev Bhattiprolu * to 1K offset of the paste address) 10922392c8c8SSukadev Bhattiprolu */ 10932392c8c8SSukadev Bhattiprolu val = SET_FIELD(RMA_LSMP_REPORT_ENABLE, 0ULL, 1); 10942392c8c8SSukadev Bhattiprolu addr += val; 10952392c8c8SSukadev Bhattiprolu } 10962392c8c8SSukadev Bhattiprolu 10972392c8c8SSukadev Bhattiprolu /* 10982392c8c8SSukadev Bhattiprolu * Map the raw CR value from vas_paste() to an error code (there 10992392c8c8SSukadev Bhattiprolu * is just pass or fail for now though). 11002392c8c8SSukadev Bhattiprolu */ 11012392c8c8SSukadev Bhattiprolu rc = vas_paste(addr, offset); 11022392c8c8SSukadev Bhattiprolu if (rc == 2) 11032392c8c8SSukadev Bhattiprolu rc = 0; 11042392c8c8SSukadev Bhattiprolu else 11052392c8c8SSukadev Bhattiprolu rc = -EINVAL; 11062392c8c8SSukadev Bhattiprolu 11070a2c2c24SSukadev Bhattiprolu pr_debug("Txwin #%d: Msg count %llu\n", txwin->winid, 11080a2c2c24SSukadev Bhattiprolu read_hvwc_reg(txwin, VREG(LRFIFO_PUSH))); 11092392c8c8SSukadev Bhattiprolu 11102392c8c8SSukadev Bhattiprolu return rc; 11112392c8c8SSukadev Bhattiprolu } 11122392c8c8SSukadev Bhattiprolu EXPORT_SYMBOL_GPL(vas_paste_crb); 11132392c8c8SSukadev Bhattiprolu 1114dfe954e4SSukadev Bhattiprolu /* 11156fccac16SSukadev Bhattiprolu * If credit checking is enabled for this window, poll for the return 11166fccac16SSukadev Bhattiprolu * of window credits (i.e for NX engines to process any outstanding CRBs). 11176fccac16SSukadev Bhattiprolu * Since NX-842 waits for the CRBs to be processed before closing the 11186fccac16SSukadev Bhattiprolu * window, we should not have to wait for too long. 11196fccac16SSukadev Bhattiprolu * 11206fccac16SSukadev Bhattiprolu * TODO: We retry in 10ms intervals now. We could/should probably peek at 11216fccac16SSukadev Bhattiprolu * the VAS_LRFIFO_PUSH_OFFSET register to get an estimate of pending 11226fccac16SSukadev Bhattiprolu * CRBs on the FIFO and compute the delay dynamically on each retry. 11236fccac16SSukadev Bhattiprolu * But that is not really needed until we support NX-GZIP access from 11246fccac16SSukadev Bhattiprolu * user space. (NX-842 driver waits for CSB and Fast thread-wakeup 11256fccac16SSukadev Bhattiprolu * doesn't use credit checking). 11266fccac16SSukadev Bhattiprolu */ 11276fccac16SSukadev Bhattiprolu static void poll_window_credits(struct vas_window *window) 11286fccac16SSukadev Bhattiprolu { 11296fccac16SSukadev Bhattiprolu u64 val; 11306fccac16SSukadev Bhattiprolu int creds, mode; 11316fccac16SSukadev Bhattiprolu 11326fccac16SSukadev Bhattiprolu val = read_hvwc_reg(window, VREG(WINCTL)); 11336fccac16SSukadev Bhattiprolu if (window->tx_win) 11346fccac16SSukadev Bhattiprolu mode = GET_FIELD(VAS_WINCTL_TX_WCRED_MODE, val); 11356fccac16SSukadev Bhattiprolu else 11366fccac16SSukadev Bhattiprolu mode = GET_FIELD(VAS_WINCTL_RX_WCRED_MODE, val); 11376fccac16SSukadev Bhattiprolu 11386fccac16SSukadev Bhattiprolu if (!mode) 11396fccac16SSukadev Bhattiprolu return; 11406fccac16SSukadev Bhattiprolu retry: 11416fccac16SSukadev Bhattiprolu if (window->tx_win) { 11426fccac16SSukadev Bhattiprolu val = read_hvwc_reg(window, VREG(TX_WCRED)); 11436fccac16SSukadev Bhattiprolu creds = GET_FIELD(VAS_TX_WCRED, val); 11446fccac16SSukadev Bhattiprolu } else { 11456fccac16SSukadev Bhattiprolu val = read_hvwc_reg(window, VREG(LRX_WCRED)); 11466fccac16SSukadev Bhattiprolu creds = GET_FIELD(VAS_LRX_WCRED, val); 11476fccac16SSukadev Bhattiprolu } 11486fccac16SSukadev Bhattiprolu 11496fccac16SSukadev Bhattiprolu if (creds < window->wcreds_max) { 11506fccac16SSukadev Bhattiprolu val = 0; 11516fccac16SSukadev Bhattiprolu set_current_state(TASK_UNINTERRUPTIBLE); 11526fccac16SSukadev Bhattiprolu schedule_timeout(msecs_to_jiffies(10)); 11536fccac16SSukadev Bhattiprolu goto retry; 11546fccac16SSukadev Bhattiprolu } 11556fccac16SSukadev Bhattiprolu } 11566fccac16SSukadev Bhattiprolu 11576fccac16SSukadev Bhattiprolu /* 1158dfe954e4SSukadev Bhattiprolu * Wait for the window to go to "not-busy" state. It should only take a 1159dfe954e4SSukadev Bhattiprolu * short time to queue a CRB, so window should not be busy for too long. 1160dfe954e4SSukadev Bhattiprolu * Trying 5ms intervals. 1161dfe954e4SSukadev Bhattiprolu */ 116298271d41SSukadev Bhattiprolu static void poll_window_busy_state(struct vas_window *window) 116398271d41SSukadev Bhattiprolu { 116498271d41SSukadev Bhattiprolu int busy; 116598271d41SSukadev Bhattiprolu u64 val; 116698271d41SSukadev Bhattiprolu 116798271d41SSukadev Bhattiprolu retry: 116898271d41SSukadev Bhattiprolu val = read_hvwc_reg(window, VREG(WIN_STATUS)); 116998271d41SSukadev Bhattiprolu busy = GET_FIELD(VAS_WIN_BUSY, val); 117098271d41SSukadev Bhattiprolu if (busy) { 117198271d41SSukadev Bhattiprolu val = 0; 117298271d41SSukadev Bhattiprolu set_current_state(TASK_UNINTERRUPTIBLE); 1173dfe954e4SSukadev Bhattiprolu schedule_timeout(msecs_to_jiffies(5)); 117498271d41SSukadev Bhattiprolu goto retry; 117598271d41SSukadev Bhattiprolu } 117698271d41SSukadev Bhattiprolu } 117798271d41SSukadev Bhattiprolu 11784963ac36SSukadev Bhattiprolu /* 11794963ac36SSukadev Bhattiprolu * Have the hardware cast a window out of cache and wait for it to 11804963ac36SSukadev Bhattiprolu * be completed. 11814963ac36SSukadev Bhattiprolu * 11824963ac36SSukadev Bhattiprolu * NOTE: It can take a relatively long time to cast the window context 11834963ac36SSukadev Bhattiprolu * out of the cache. It is not strictly necessary to cast out if: 11844963ac36SSukadev Bhattiprolu * 11854963ac36SSukadev Bhattiprolu * - we clear the "Pin Window" bit (so hardware is free to evict) 11864963ac36SSukadev Bhattiprolu * 11874963ac36SSukadev Bhattiprolu * - we re-initialize the window context when it is reassigned. 11884963ac36SSukadev Bhattiprolu * 11894963ac36SSukadev Bhattiprolu * We do the former in vas_win_close() and latter in vas_win_open(). 11904963ac36SSukadev Bhattiprolu * So, ignoring the cast-out for now. We can add it as needed. If 11914963ac36SSukadev Bhattiprolu * casting out becomes necessary we should consider offloading the 11924963ac36SSukadev Bhattiprolu * job to a worker thread, so the window close can proceed quickly. 11934963ac36SSukadev Bhattiprolu */ 119498271d41SSukadev Bhattiprolu static void poll_window_castout(struct vas_window *window) 119598271d41SSukadev Bhattiprolu { 11964963ac36SSukadev Bhattiprolu /* stub for now */ 119798271d41SSukadev Bhattiprolu } 119898271d41SSukadev Bhattiprolu 119998271d41SSukadev Bhattiprolu /* 120036a288feSSukadev Bhattiprolu * Unpin and close a window so no new requests are accepted and the 120136a288feSSukadev Bhattiprolu * hardware can evict this window from cache if necessary. 120236a288feSSukadev Bhattiprolu */ 120336a288feSSukadev Bhattiprolu static void unpin_close_window(struct vas_window *window) 120436a288feSSukadev Bhattiprolu { 120536a288feSSukadev Bhattiprolu u64 val; 120636a288feSSukadev Bhattiprolu 120736a288feSSukadev Bhattiprolu val = read_hvwc_reg(window, VREG(WINCTL)); 120836a288feSSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_PIN, val, 0); 120936a288feSSukadev Bhattiprolu val = SET_FIELD(VAS_WINCTL_OPEN, val, 0); 121036a288feSSukadev Bhattiprolu write_hvwc_reg(window, VREG(WINCTL), val); 121136a288feSSukadev Bhattiprolu } 121236a288feSSukadev Bhattiprolu 121336a288feSSukadev Bhattiprolu /* 121498271d41SSukadev Bhattiprolu * Close a window. 121598271d41SSukadev Bhattiprolu * 121698271d41SSukadev Bhattiprolu * See Section 1.12.1 of VAS workbook v1.05 for details on closing window: 121798271d41SSukadev Bhattiprolu * - Disable new paste operations (unmap paste address) 121898271d41SSukadev Bhattiprolu * - Poll for the "Window Busy" bit to be cleared 121998271d41SSukadev Bhattiprolu * - Clear the Open/Enable bit for the Window. 122098271d41SSukadev Bhattiprolu * - Poll for return of window Credits (implies FIFO empty for Rx win?) 122198271d41SSukadev Bhattiprolu * - Unpin and cast window context out of cache 122298271d41SSukadev Bhattiprolu * 122398271d41SSukadev Bhattiprolu * Besides the hardware, kernel has some bookkeeping of course. 122498271d41SSukadev Bhattiprolu */ 12254dea2d1aSSukadev Bhattiprolu int vas_win_close(struct vas_window *window) 12264dea2d1aSSukadev Bhattiprolu { 122798271d41SSukadev Bhattiprolu if (!window) 122898271d41SSukadev Bhattiprolu return 0; 122998271d41SSukadev Bhattiprolu 123098271d41SSukadev Bhattiprolu if (!window->tx_win && atomic_read(&window->num_txwins) != 0) { 123198271d41SSukadev Bhattiprolu pr_devel("Attempting to close an active Rx window!\n"); 123298271d41SSukadev Bhattiprolu WARN_ON_ONCE(1); 123398271d41SSukadev Bhattiprolu return -EBUSY; 12344dea2d1aSSukadev Bhattiprolu } 123598271d41SSukadev Bhattiprolu 123698271d41SSukadev Bhattiprolu unmap_paste_region(window); 123798271d41SSukadev Bhattiprolu 123898271d41SSukadev Bhattiprolu clear_vinst_win(window); 123998271d41SSukadev Bhattiprolu 124098271d41SSukadev Bhattiprolu poll_window_busy_state(window); 124198271d41SSukadev Bhattiprolu 124236a288feSSukadev Bhattiprolu unpin_close_window(window); 124398271d41SSukadev Bhattiprolu 12446fccac16SSukadev Bhattiprolu poll_window_credits(window); 12456fccac16SSukadev Bhattiprolu 124698271d41SSukadev Bhattiprolu poll_window_castout(window); 124798271d41SSukadev Bhattiprolu 124898271d41SSukadev Bhattiprolu /* if send window, drop reference to matching receive window */ 124998271d41SSukadev Bhattiprolu if (window->tx_win) 125098271d41SSukadev Bhattiprolu put_rx_win(window->rxwin); 125198271d41SSukadev Bhattiprolu 125298271d41SSukadev Bhattiprolu vas_window_free(window); 125398271d41SSukadev Bhattiprolu 125498271d41SSukadev Bhattiprolu return 0; 125598271d41SSukadev Bhattiprolu } 125698271d41SSukadev Bhattiprolu EXPORT_SYMBOL_GPL(vas_win_close); 1257