^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) // Copyright 2017 IBM Corp.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) #include <linux/poll.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #include <linux/sched/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/eventfd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <uapi/misc/ocxl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <asm/reg.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <asm/switch_to.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include "ocxl_internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #define OCXL_NUM_MINORS 256 /* Total to reserve */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) static dev_t ocxl_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) static struct class *ocxl_class;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) static struct mutex minors_idr_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) static struct idr minors_idr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) static struct ocxl_file_info *find_and_get_file_info(dev_t devno)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) struct ocxl_file_info *info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) mutex_lock(&minors_idr_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) info = idr_find(&minors_idr, MINOR(devno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) if (info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) get_device(&info->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) mutex_unlock(&minors_idr_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) return info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) static int allocate_minor(struct ocxl_file_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) int minor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) mutex_lock(&minors_idr_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) minor = idr_alloc(&minors_idr, info, 0, OCXL_NUM_MINORS, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) mutex_unlock(&minors_idr_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) return minor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) static void free_minor(struct ocxl_file_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) mutex_lock(&minors_idr_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) idr_remove(&minors_idr, MINOR(info->dev.devt));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) mutex_unlock(&minors_idr_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) static int afu_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) struct ocxl_file_info *info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) struct ocxl_context *ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) pr_debug("%s for device %x\n", __func__, inode->i_rdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) info = find_and_get_file_info(inode->i_rdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) if (!info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) rc = ocxl_context_alloc(&ctx, info->afu, inode->i_mapping);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) put_device(&info->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) put_device(&info->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) file->private_data = ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) static long afu_ioctl_attach(struct ocxl_context *ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) struct ocxl_ioctl_attach __user *uarg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) struct ocxl_ioctl_attach arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) u64 amr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) pr_debug("%s for context %d\n", __func__, ctx->pasid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) if (copy_from_user(&arg, uarg, sizeof(arg)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) /* Make sure reserved fields are not set for forward compatibility */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) if (arg.reserved1 || arg.reserved2 || arg.reserved3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) amr = arg.amr & mfspr(SPRN_UAMOR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) rc = ocxl_context_attach(ctx, amr, current->mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) static long afu_ioctl_get_metadata(struct ocxl_context *ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) struct ocxl_ioctl_metadata __user *uarg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) struct ocxl_ioctl_metadata arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) memset(&arg, 0, sizeof(arg));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) arg.version = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) arg.afu_version_major = ctx->afu->config.version_major;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) arg.afu_version_minor = ctx->afu->config.version_minor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) arg.pasid = ctx->pasid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) arg.pp_mmio_size = ctx->afu->config.pp_mmio_stride;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) arg.global_mmio_size = ctx->afu->config.global_mmio_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) if (copy_to_user(uarg, &arg, sizeof(arg)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) #ifdef CONFIG_PPC64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) static long afu_ioctl_enable_p9_wait(struct ocxl_context *ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) struct ocxl_ioctl_p9_wait __user *uarg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) struct ocxl_ioctl_p9_wait arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) memset(&arg, 0, sizeof(arg));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) if (cpu_has_feature(CPU_FTR_P9_TIDR)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) enum ocxl_context_status status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) // Locks both status & tidr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) mutex_lock(&ctx->status_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) if (!ctx->tidr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) if (set_thread_tidr(current)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) mutex_unlock(&ctx->status_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) ctx->tidr = current->thread.tidr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) status = ctx->status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) mutex_unlock(&ctx->status_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) if (status == ATTACHED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) int rc = ocxl_link_update_pe(ctx->afu->fn->link,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) ctx->pasid, ctx->tidr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) arg.thread_id = ctx->tidr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) if (copy_to_user(uarg, &arg, sizeof(arg)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) static long afu_ioctl_get_features(struct ocxl_context *ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) struct ocxl_ioctl_features __user *uarg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) struct ocxl_ioctl_features arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) memset(&arg, 0, sizeof(arg));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) #ifdef CONFIG_PPC64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) if (cpu_has_feature(CPU_FTR_P9_TIDR))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) arg.flags[0] |= OCXL_IOCTL_FEATURES_FLAGS0_P9_WAIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) if (copy_to_user(uarg, &arg, sizeof(arg)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) #define CMD_STR(x) (x == OCXL_IOCTL_ATTACH ? "ATTACH" : \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) x == OCXL_IOCTL_IRQ_ALLOC ? "IRQ_ALLOC" : \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) x == OCXL_IOCTL_IRQ_FREE ? "IRQ_FREE" : \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) x == OCXL_IOCTL_IRQ_SET_FD ? "IRQ_SET_FD" : \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) x == OCXL_IOCTL_GET_METADATA ? "GET_METADATA" : \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) x == OCXL_IOCTL_ENABLE_P9_WAIT ? "ENABLE_P9_WAIT" : \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) x == OCXL_IOCTL_GET_FEATURES ? "GET_FEATURES" : \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) "UNKNOWN")
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) static irqreturn_t irq_handler(void *private)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) struct eventfd_ctx *ev_ctx = private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) eventfd_signal(ev_ctx, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) static void irq_free(void *private)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) struct eventfd_ctx *ev_ctx = private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) eventfd_ctx_put(ev_ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) static long afu_ioctl(struct file *file, unsigned int cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) unsigned long args)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) struct ocxl_context *ctx = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) struct ocxl_ioctl_irq_fd irq_fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) struct eventfd_ctx *ev_ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) int irq_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) u64 irq_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) long rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) bool closed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) pr_debug("%s for context %d, command %s\n", __func__, ctx->pasid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) CMD_STR(cmd));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) mutex_lock(&ctx->status_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) closed = (ctx->status == CLOSED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) mutex_unlock(&ctx->status_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) if (closed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) case OCXL_IOCTL_ATTACH:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) rc = afu_ioctl_attach(ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) (struct ocxl_ioctl_attach __user *) args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) case OCXL_IOCTL_IRQ_ALLOC:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) rc = ocxl_afu_irq_alloc(ctx, &irq_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) if (!rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) irq_offset = ocxl_irq_id_to_offset(ctx, irq_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) rc = copy_to_user((u64 __user *) args, &irq_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) sizeof(irq_offset));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) ocxl_afu_irq_free(ctx, irq_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) case OCXL_IOCTL_IRQ_FREE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) rc = copy_from_user(&irq_offset, (u64 __user *) args,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) sizeof(irq_offset));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) irq_id = ocxl_irq_offset_to_id(ctx, irq_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) rc = ocxl_afu_irq_free(ctx, irq_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) case OCXL_IOCTL_IRQ_SET_FD:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) rc = copy_from_user(&irq_fd, (u64 __user *) args,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) sizeof(irq_fd));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) if (irq_fd.reserved)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) irq_id = ocxl_irq_offset_to_id(ctx, irq_fd.irq_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) ev_ctx = eventfd_ctx_fdget(irq_fd.eventfd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) if (IS_ERR(ev_ctx))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) return PTR_ERR(ev_ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) rc = ocxl_irq_set_handler(ctx, irq_id, irq_handler, irq_free, ev_ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) case OCXL_IOCTL_GET_METADATA:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) rc = afu_ioctl_get_metadata(ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) (struct ocxl_ioctl_metadata __user *) args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) #ifdef CONFIG_PPC64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) case OCXL_IOCTL_ENABLE_P9_WAIT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) rc = afu_ioctl_enable_p9_wait(ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) (struct ocxl_ioctl_p9_wait __user *) args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) case OCXL_IOCTL_GET_FEATURES:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) rc = afu_ioctl_get_features(ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) (struct ocxl_ioctl_features __user *) args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) rc = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) static long afu_compat_ioctl(struct file *file, unsigned int cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) unsigned long args)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) return afu_ioctl(file, cmd, args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) static int afu_mmap(struct file *file, struct vm_area_struct *vma)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) struct ocxl_context *ctx = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) pr_debug("%s for context %d\n", __func__, ctx->pasid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) return ocxl_context_mmap(ctx, vma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) static bool has_xsl_error(struct ocxl_context *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) bool ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) mutex_lock(&ctx->xsl_error_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) ret = !!ctx->xsl_error.addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) mutex_unlock(&ctx->xsl_error_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) * Are there any events pending on the AFU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) * ctx: The AFU context
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) * Returns: true if there are events pending
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) static bool afu_events_pending(struct ocxl_context *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) if (has_xsl_error(ctx))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) static unsigned int afu_poll(struct file *file, struct poll_table_struct *wait)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) struct ocxl_context *ctx = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) unsigned int mask = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) bool closed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) pr_debug("%s for context %d\n", __func__, ctx->pasid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) poll_wait(file, &ctx->events_wq, wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) mutex_lock(&ctx->status_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) closed = (ctx->status == CLOSED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) mutex_unlock(&ctx->status_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) if (afu_events_pending(ctx))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) mask = EPOLLIN | EPOLLRDNORM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) else if (closed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) mask = EPOLLERR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) return mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) * Populate the supplied buffer with a single XSL error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) * ctx: The AFU context to report the error from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) * header: the event header to populate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) * buf: The buffer to write the body into (should be at least
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) * AFU_EVENT_BODY_XSL_ERROR_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) * Return: the amount of buffer that was populated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) static ssize_t append_xsl_error(struct ocxl_context *ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) struct ocxl_kernel_event_header *header,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) char __user *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) struct ocxl_kernel_event_xsl_fault_error body;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) memset(&body, 0, sizeof(body));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) mutex_lock(&ctx->xsl_error_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) if (!ctx->xsl_error.addr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) mutex_unlock(&ctx->xsl_error_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) body.addr = ctx->xsl_error.addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) body.dsisr = ctx->xsl_error.dsisr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) body.count = ctx->xsl_error.count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) ctx->xsl_error.addr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) ctx->xsl_error.dsisr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) ctx->xsl_error.count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) mutex_unlock(&ctx->xsl_error_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) header->type = OCXL_AFU_EVENT_XSL_FAULT_ERROR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) if (copy_to_user(buf, &body, sizeof(body)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) return sizeof(body);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) #define AFU_EVENT_BODY_MAX_SIZE sizeof(struct ocxl_kernel_event_xsl_fault_error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) * Reports events on the AFU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) * Format:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) * Header (struct ocxl_kernel_event_header)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) * Body (struct ocxl_kernel_event_*)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) * Header...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) static ssize_t afu_read(struct file *file, char __user *buf, size_t count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) loff_t *off)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) struct ocxl_context *ctx = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) struct ocxl_kernel_event_header header;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) ssize_t rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) ssize_t used = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) DEFINE_WAIT(event_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) memset(&header, 0, sizeof(header));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) /* Require offset to be 0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) if (*off != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) if (count < (sizeof(struct ocxl_kernel_event_header) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) AFU_EVENT_BODY_MAX_SIZE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) for (;;) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) prepare_to_wait(&ctx->events_wq, &event_wait,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) TASK_INTERRUPTIBLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) if (afu_events_pending(ctx))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) if (ctx->status == CLOSED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) if (file->f_flags & O_NONBLOCK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) finish_wait(&ctx->events_wq, &event_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) return -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) if (signal_pending(current)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) finish_wait(&ctx->events_wq, &event_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) return -ERESTARTSYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) schedule();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) finish_wait(&ctx->events_wq, &event_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) if (has_xsl_error(ctx)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) used = append_xsl_error(ctx, &header, buf + sizeof(header));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) if (used < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) return used;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) if (!afu_events_pending(ctx))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) header.flags |= OCXL_KERNEL_EVENT_FLAG_LAST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) if (copy_to_user(buf, &header, sizeof(header)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) used += sizeof(header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) rc = used;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) static int afu_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) struct ocxl_context *ctx = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) pr_debug("%s for device %x\n", __func__, inode->i_rdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) rc = ocxl_context_detach(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) mutex_lock(&ctx->mapping_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) ctx->mapping = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) mutex_unlock(&ctx->mapping_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) wake_up_all(&ctx->events_wq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) if (rc != -EBUSY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) ocxl_context_free(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) static const struct file_operations ocxl_afu_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) .open = afu_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) .unlocked_ioctl = afu_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) .compat_ioctl = afu_compat_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) .mmap = afu_mmap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) .poll = afu_poll,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) .read = afu_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) .release = afu_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) // Free the info struct
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) static void info_release(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) struct ocxl_file_info *info = container_of(dev, struct ocxl_file_info, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) ocxl_afu_put(info->afu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) kfree(info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) static int ocxl_file_make_visible(struct ocxl_file_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) cdev_init(&info->cdev, &ocxl_afu_fops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) rc = cdev_add(&info->cdev, info->dev.devt, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) dev_err(&info->dev, "Unable to add afu char device: %d\n", rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) static void ocxl_file_make_invisible(struct ocxl_file_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) cdev_del(&info->cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) int ocxl_file_register_afu(struct ocxl_afu *afu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) int minor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) struct ocxl_file_info *info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) struct ocxl_fn *fn = afu->fn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) struct pci_dev *pci_dev = to_pci_dev(fn->dev.parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) info = kzalloc(sizeof(*info), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) if (info == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) minor = allocate_minor(info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) if (minor < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) kfree(info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) return minor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) info->dev.parent = &fn->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) info->dev.devt = MKDEV(MAJOR(ocxl_dev), minor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) info->dev.class = ocxl_class;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) info->dev.release = info_release;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) info->afu = afu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) ocxl_afu_get(afu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) rc = dev_set_name(&info->dev, "%s.%s.%hhu",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) afu->config.name, dev_name(&pci_dev->dev), afu->config.idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) goto err_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) rc = device_register(&info->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) goto err_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) rc = ocxl_sysfs_register_afu(info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) goto err_unregister;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) rc = ocxl_file_make_visible(info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) goto err_unregister;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) ocxl_afu_set_private(afu, info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) err_unregister:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) ocxl_sysfs_unregister_afu(info); // safe to call even if register failed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) device_unregister(&info->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) err_put:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) ocxl_afu_put(afu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) free_minor(info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) kfree(info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) void ocxl_file_unregister_afu(struct ocxl_afu *afu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) struct ocxl_file_info *info = ocxl_afu_get_private(afu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) if (!info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) ocxl_file_make_invisible(info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) ocxl_sysfs_unregister_afu(info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) free_minor(info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) device_unregister(&info->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) static char *ocxl_devnode(struct device *dev, umode_t *mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) return kasprintf(GFP_KERNEL, "ocxl/%s", dev_name(dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) int ocxl_file_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) mutex_init(&minors_idr_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) idr_init(&minors_idr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) rc = alloc_chrdev_region(&ocxl_dev, 0, OCXL_NUM_MINORS, "ocxl");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) pr_err("Unable to allocate ocxl major number: %d\n", rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) ocxl_class = class_create(THIS_MODULE, "ocxl");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) if (IS_ERR(ocxl_class)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) pr_err("Unable to create ocxl class\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) unregister_chrdev_region(ocxl_dev, OCXL_NUM_MINORS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) return PTR_ERR(ocxl_class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) ocxl_class->devnode = ocxl_devnode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) void ocxl_file_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) class_destroy(ocxl_class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) unregister_chrdev_region(ocxl_dev, OCXL_NUM_MINORS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) idr_destroy(&minors_idr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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