15ef3166eSFrederic Barrat // SPDX-License-Identifier: GPL-2.0+
25ef3166eSFrederic Barrat // Copyright 2017 IBM Corp.
35ef3166eSFrederic Barrat #include <linux/fs.h>
45ef3166eSFrederic Barrat #include <linux/poll.h>
55ef3166eSFrederic Barrat #include <linux/sched/signal.h>
606014661SAlastair D'Silva #include <linux/eventfd.h>
75ef3166eSFrederic Barrat #include <linux/uaccess.h>
85ef3166eSFrederic Barrat #include <uapi/misc/ocxl.h>
9e948e06fSAlastair D'Silva #include <asm/reg.h>
10e948e06fSAlastair D'Silva #include <asm/switch_to.h>
115ef3166eSFrederic Barrat #include "ocxl_internal.h"
125ef3166eSFrederic Barrat
135ef3166eSFrederic Barrat
145ef3166eSFrederic Barrat #define OCXL_NUM_MINORS 256 /* Total to reserve */
155ef3166eSFrederic Barrat
165ef3166eSFrederic Barrat static dev_t ocxl_dev;
175ef3166eSFrederic Barrat static struct class *ocxl_class;
1852f6b0a9SZheng Yongjun static DEFINE_MUTEX(minors_idr_lock);
195ef3166eSFrederic Barrat static struct idr minors_idr;
205ef3166eSFrederic Barrat
find_and_get_file_info(dev_t devno)21a58d37bcSFrederic Barrat static struct ocxl_file_info *find_and_get_file_info(dev_t devno)
225ef3166eSFrederic Barrat {
2375ca758aSAlastair D'Silva struct ocxl_file_info *info;
245ef3166eSFrederic Barrat
25a58d37bcSFrederic Barrat mutex_lock(&minors_idr_lock);
2675ca758aSAlastair D'Silva info = idr_find(&minors_idr, MINOR(devno));
27a58d37bcSFrederic Barrat if (info)
28a58d37bcSFrederic Barrat get_device(&info->dev);
29a58d37bcSFrederic Barrat mutex_unlock(&minors_idr_lock);
3075ca758aSAlastair D'Silva return info;
315ef3166eSFrederic Barrat }
325ef3166eSFrederic Barrat
allocate_minor(struct ocxl_file_info * info)3375ca758aSAlastair D'Silva static int allocate_minor(struct ocxl_file_info *info)
345ef3166eSFrederic Barrat {
355ef3166eSFrederic Barrat int minor;
365ef3166eSFrederic Barrat
375ef3166eSFrederic Barrat mutex_lock(&minors_idr_lock);
3875ca758aSAlastair D'Silva minor = idr_alloc(&minors_idr, info, 0, OCXL_NUM_MINORS, GFP_KERNEL);
395ef3166eSFrederic Barrat mutex_unlock(&minors_idr_lock);
405ef3166eSFrederic Barrat return minor;
415ef3166eSFrederic Barrat }
425ef3166eSFrederic Barrat
free_minor(struct ocxl_file_info * info)4375ca758aSAlastair D'Silva static void free_minor(struct ocxl_file_info *info)
445ef3166eSFrederic Barrat {
455ef3166eSFrederic Barrat mutex_lock(&minors_idr_lock);
4675ca758aSAlastair D'Silva idr_remove(&minors_idr, MINOR(info->dev.devt));
475ef3166eSFrederic Barrat mutex_unlock(&minors_idr_lock);
485ef3166eSFrederic Barrat }
495ef3166eSFrederic Barrat
afu_open(struct inode * inode,struct file * file)505ef3166eSFrederic Barrat static int afu_open(struct inode *inode, struct file *file)
515ef3166eSFrederic Barrat {
5275ca758aSAlastair D'Silva struct ocxl_file_info *info;
535ef3166eSFrederic Barrat struct ocxl_context *ctx;
545ef3166eSFrederic Barrat int rc;
555ef3166eSFrederic Barrat
565ef3166eSFrederic Barrat pr_debug("%s for device %x\n", __func__, inode->i_rdev);
575ef3166eSFrederic Barrat
58a58d37bcSFrederic Barrat info = find_and_get_file_info(inode->i_rdev);
5975ca758aSAlastair D'Silva if (!info)
605ef3166eSFrederic Barrat return -ENODEV;
615ef3166eSFrederic Barrat
62b9721d27SAlastair D'Silva rc = ocxl_context_alloc(&ctx, info->afu, inode->i_mapping);
63a58d37bcSFrederic Barrat if (rc) {
64a58d37bcSFrederic Barrat put_device(&info->dev);
655ef3166eSFrederic Barrat return rc;
66a58d37bcSFrederic Barrat }
67a58d37bcSFrederic Barrat put_device(&info->dev);
6875ca758aSAlastair D'Silva file->private_data = ctx;
6975ca758aSAlastair D'Silva return 0;
705ef3166eSFrederic Barrat }
715ef3166eSFrederic Barrat
afu_ioctl_attach(struct ocxl_context * ctx,struct ocxl_ioctl_attach __user * uarg)725ef3166eSFrederic Barrat static long afu_ioctl_attach(struct ocxl_context *ctx,
735ef3166eSFrederic Barrat struct ocxl_ioctl_attach __user *uarg)
745ef3166eSFrederic Barrat {
755ef3166eSFrederic Barrat struct ocxl_ioctl_attach arg;
765ef3166eSFrederic Barrat u64 amr = 0;
775ef3166eSFrederic Barrat
785ef3166eSFrederic Barrat pr_debug("%s for context %d\n", __func__, ctx->pasid);
795ef3166eSFrederic Barrat
805ef3166eSFrederic Barrat if (copy_from_user(&arg, uarg, sizeof(arg)))
815ef3166eSFrederic Barrat return -EFAULT;
825ef3166eSFrederic Barrat
835ef3166eSFrederic Barrat /* Make sure reserved fields are not set for forward compatibility */
845ef3166eSFrederic Barrat if (arg.reserved1 || arg.reserved2 || arg.reserved3)
855ef3166eSFrederic Barrat return -EINVAL;
865ef3166eSFrederic Barrat
875ef3166eSFrederic Barrat amr = arg.amr & mfspr(SPRN_UAMOR);
8830e120e6SMinghao Chi return ocxl_context_attach(ctx, amr, current->mm);
895ef3166eSFrederic Barrat }
905ef3166eSFrederic Barrat
afu_ioctl_get_metadata(struct ocxl_context * ctx,struct ocxl_ioctl_metadata __user * uarg)9107c5ccd7SAlastair D'Silva static long afu_ioctl_get_metadata(struct ocxl_context *ctx,
9207c5ccd7SAlastair D'Silva struct ocxl_ioctl_metadata __user *uarg)
9307c5ccd7SAlastair D'Silva {
9407c5ccd7SAlastair D'Silva struct ocxl_ioctl_metadata arg;
9507c5ccd7SAlastair D'Silva
9607c5ccd7SAlastair D'Silva memset(&arg, 0, sizeof(arg));
9707c5ccd7SAlastair D'Silva
9807c5ccd7SAlastair D'Silva arg.version = 0;
9907c5ccd7SAlastair D'Silva
10007c5ccd7SAlastair D'Silva arg.afu_version_major = ctx->afu->config.version_major;
10107c5ccd7SAlastair D'Silva arg.afu_version_minor = ctx->afu->config.version_minor;
10207c5ccd7SAlastair D'Silva arg.pasid = ctx->pasid;
10307c5ccd7SAlastair D'Silva arg.pp_mmio_size = ctx->afu->config.pp_mmio_stride;
10407c5ccd7SAlastair D'Silva arg.global_mmio_size = ctx->afu->config.global_mmio_size;
10507c5ccd7SAlastair D'Silva
10607c5ccd7SAlastair D'Silva if (copy_to_user(uarg, &arg, sizeof(arg)))
10707c5ccd7SAlastair D'Silva return -EFAULT;
10807c5ccd7SAlastair D'Silva
10907c5ccd7SAlastair D'Silva return 0;
11007c5ccd7SAlastair D'Silva }
11107c5ccd7SAlastair D'Silva
112e948e06fSAlastair D'Silva #ifdef CONFIG_PPC64
afu_ioctl_enable_p9_wait(struct ocxl_context * ctx,struct ocxl_ioctl_p9_wait __user * uarg)113e948e06fSAlastair D'Silva static long afu_ioctl_enable_p9_wait(struct ocxl_context *ctx,
114e948e06fSAlastair D'Silva struct ocxl_ioctl_p9_wait __user *uarg)
115e948e06fSAlastair D'Silva {
116e948e06fSAlastair D'Silva struct ocxl_ioctl_p9_wait arg;
117e948e06fSAlastair D'Silva
118e948e06fSAlastair D'Silva memset(&arg, 0, sizeof(arg));
119e948e06fSAlastair D'Silva
120e948e06fSAlastair D'Silva if (cpu_has_feature(CPU_FTR_P9_TIDR)) {
121e948e06fSAlastair D'Silva enum ocxl_context_status status;
122e948e06fSAlastair D'Silva
123e948e06fSAlastair D'Silva // Locks both status & tidr
124e948e06fSAlastair D'Silva mutex_lock(&ctx->status_mutex);
125e948e06fSAlastair D'Silva if (!ctx->tidr) {
1262e5c93d6SWei Yongjun if (set_thread_tidr(current)) {
1272e5c93d6SWei Yongjun mutex_unlock(&ctx->status_mutex);
128e948e06fSAlastair D'Silva return -ENOENT;
1292e5c93d6SWei Yongjun }
130e948e06fSAlastair D'Silva
131e948e06fSAlastair D'Silva ctx->tidr = current->thread.tidr;
132e948e06fSAlastair D'Silva }
133e948e06fSAlastair D'Silva
134e948e06fSAlastair D'Silva status = ctx->status;
135e948e06fSAlastair D'Silva mutex_unlock(&ctx->status_mutex);
136e948e06fSAlastair D'Silva
137e948e06fSAlastair D'Silva if (status == ATTACHED) {
1389c4ae064SAlastair D'Silva int rc = ocxl_link_update_pe(ctx->afu->fn->link,
1399c4ae064SAlastair D'Silva ctx->pasid, ctx->tidr);
140e948e06fSAlastair D'Silva
141e948e06fSAlastair D'Silva if (rc)
142e948e06fSAlastair D'Silva return rc;
143e948e06fSAlastair D'Silva }
144e948e06fSAlastair D'Silva
145e948e06fSAlastair D'Silva arg.thread_id = ctx->tidr;
146e948e06fSAlastair D'Silva } else
147e948e06fSAlastair D'Silva return -ENOENT;
148e948e06fSAlastair D'Silva
149e948e06fSAlastair D'Silva if (copy_to_user(uarg, &arg, sizeof(arg)))
150e948e06fSAlastair D'Silva return -EFAULT;
151e948e06fSAlastair D'Silva
152e948e06fSAlastair D'Silva return 0;
153e948e06fSAlastair D'Silva }
154e948e06fSAlastair D'Silva #endif
155e948e06fSAlastair D'Silva
15602a8e5bcSAlastair D'Silva
afu_ioctl_get_features(struct ocxl_context * ctx,struct ocxl_ioctl_features __user * uarg)15702a8e5bcSAlastair D'Silva static long afu_ioctl_get_features(struct ocxl_context *ctx,
15802a8e5bcSAlastair D'Silva struct ocxl_ioctl_features __user *uarg)
15902a8e5bcSAlastair D'Silva {
16002a8e5bcSAlastair D'Silva struct ocxl_ioctl_features arg;
16102a8e5bcSAlastair D'Silva
16202a8e5bcSAlastair D'Silva memset(&arg, 0, sizeof(arg));
16302a8e5bcSAlastair D'Silva
16402a8e5bcSAlastair D'Silva #ifdef CONFIG_PPC64
16502a8e5bcSAlastair D'Silva if (cpu_has_feature(CPU_FTR_P9_TIDR))
16602a8e5bcSAlastair D'Silva arg.flags[0] |= OCXL_IOCTL_FEATURES_FLAGS0_P9_WAIT;
16702a8e5bcSAlastair D'Silva #endif
16802a8e5bcSAlastair D'Silva
16902a8e5bcSAlastair D'Silva if (copy_to_user(uarg, &arg, sizeof(arg)))
17002a8e5bcSAlastair D'Silva return -EFAULT;
17102a8e5bcSAlastair D'Silva
17202a8e5bcSAlastair D'Silva return 0;
17302a8e5bcSAlastair D'Silva }
17402a8e5bcSAlastair D'Silva
1755ef3166eSFrederic Barrat #define CMD_STR(x) (x == OCXL_IOCTL_ATTACH ? "ATTACH" : \
176aeddad17SFrederic Barrat x == OCXL_IOCTL_IRQ_ALLOC ? "IRQ_ALLOC" : \
177aeddad17SFrederic Barrat x == OCXL_IOCTL_IRQ_FREE ? "IRQ_FREE" : \
178aeddad17SFrederic Barrat x == OCXL_IOCTL_IRQ_SET_FD ? "IRQ_SET_FD" : \
17907c5ccd7SAlastair D'Silva x == OCXL_IOCTL_GET_METADATA ? "GET_METADATA" : \
180e948e06fSAlastair D'Silva x == OCXL_IOCTL_ENABLE_P9_WAIT ? "ENABLE_P9_WAIT" : \
18102a8e5bcSAlastair D'Silva x == OCXL_IOCTL_GET_FEATURES ? "GET_FEATURES" : \
1825ef3166eSFrederic Barrat "UNKNOWN")
1835ef3166eSFrederic Barrat
irq_handler(void * private)18406014661SAlastair D'Silva static irqreturn_t irq_handler(void *private)
18506014661SAlastair D'Silva {
18606014661SAlastair D'Silva struct eventfd_ctx *ev_ctx = private;
18706014661SAlastair D'Silva
18806014661SAlastair D'Silva eventfd_signal(ev_ctx, 1);
18906014661SAlastair D'Silva return IRQ_HANDLED;
19006014661SAlastair D'Silva }
19106014661SAlastair D'Silva
irq_free(void * private)19206014661SAlastair D'Silva static void irq_free(void *private)
19306014661SAlastair D'Silva {
19406014661SAlastair D'Silva struct eventfd_ctx *ev_ctx = private;
19506014661SAlastair D'Silva
19606014661SAlastair D'Silva eventfd_ctx_put(ev_ctx);
19706014661SAlastair D'Silva }
19806014661SAlastair D'Silva
afu_ioctl(struct file * file,unsigned int cmd,unsigned long args)1995ef3166eSFrederic Barrat static long afu_ioctl(struct file *file, unsigned int cmd,
2005ef3166eSFrederic Barrat unsigned long args)
2015ef3166eSFrederic Barrat {
2025ef3166eSFrederic Barrat struct ocxl_context *ctx = file->private_data;
203aeddad17SFrederic Barrat struct ocxl_ioctl_irq_fd irq_fd;
20406014661SAlastair D'Silva struct eventfd_ctx *ev_ctx;
2052ec3b7edSAlastair D'Silva int irq_id;
206aeddad17SFrederic Barrat u64 irq_offset;
2075ef3166eSFrederic Barrat long rc;
20875ca758aSAlastair D'Silva bool closed;
2095ef3166eSFrederic Barrat
2105ef3166eSFrederic Barrat pr_debug("%s for context %d, command %s\n", __func__, ctx->pasid,
2115ef3166eSFrederic Barrat CMD_STR(cmd));
2125ef3166eSFrederic Barrat
21375ca758aSAlastair D'Silva mutex_lock(&ctx->status_mutex);
21475ca758aSAlastair D'Silva closed = (ctx->status == CLOSED);
21575ca758aSAlastair D'Silva mutex_unlock(&ctx->status_mutex);
21675ca758aSAlastair D'Silva
21775ca758aSAlastair D'Silva if (closed)
2185ef3166eSFrederic Barrat return -EIO;
2195ef3166eSFrederic Barrat
2205ef3166eSFrederic Barrat switch (cmd) {
2215ef3166eSFrederic Barrat case OCXL_IOCTL_ATTACH:
2225ef3166eSFrederic Barrat rc = afu_ioctl_attach(ctx,
2235ef3166eSFrederic Barrat (struct ocxl_ioctl_attach __user *) args);
2245ef3166eSFrederic Barrat break;
2255ef3166eSFrederic Barrat
226aeddad17SFrederic Barrat case OCXL_IOCTL_IRQ_ALLOC:
2272ec3b7edSAlastair D'Silva rc = ocxl_afu_irq_alloc(ctx, &irq_id);
228aeddad17SFrederic Barrat if (!rc) {
2292ec3b7edSAlastair D'Silva irq_offset = ocxl_irq_id_to_offset(ctx, irq_id);
230aeddad17SFrederic Barrat rc = copy_to_user((u64 __user *) args, &irq_offset,
231aeddad17SFrederic Barrat sizeof(irq_offset));
232423688abSFrederic Barrat if (rc) {
2332ec3b7edSAlastair D'Silva ocxl_afu_irq_free(ctx, irq_id);
234423688abSFrederic Barrat return -EFAULT;
235423688abSFrederic Barrat }
236aeddad17SFrederic Barrat }
237aeddad17SFrederic Barrat break;
238aeddad17SFrederic Barrat
239aeddad17SFrederic Barrat case OCXL_IOCTL_IRQ_FREE:
240aeddad17SFrederic Barrat rc = copy_from_user(&irq_offset, (u64 __user *) args,
241aeddad17SFrederic Barrat sizeof(irq_offset));
242aeddad17SFrederic Barrat if (rc)
243aeddad17SFrederic Barrat return -EFAULT;
2442ec3b7edSAlastair D'Silva irq_id = ocxl_irq_offset_to_id(ctx, irq_offset);
2452ec3b7edSAlastair D'Silva rc = ocxl_afu_irq_free(ctx, irq_id);
246aeddad17SFrederic Barrat break;
247aeddad17SFrederic Barrat
248aeddad17SFrederic Barrat case OCXL_IOCTL_IRQ_SET_FD:
249aeddad17SFrederic Barrat rc = copy_from_user(&irq_fd, (u64 __user *) args,
250aeddad17SFrederic Barrat sizeof(irq_fd));
251aeddad17SFrederic Barrat if (rc)
252aeddad17SFrederic Barrat return -EFAULT;
253aeddad17SFrederic Barrat if (irq_fd.reserved)
254aeddad17SFrederic Barrat return -EINVAL;
2552ec3b7edSAlastair D'Silva irq_id = ocxl_irq_offset_to_id(ctx, irq_fd.irq_offset);
25606014661SAlastair D'Silva ev_ctx = eventfd_ctx_fdget(irq_fd.eventfd);
2576be6a8deSWei Yongjun if (IS_ERR(ev_ctx))
2586be6a8deSWei Yongjun return PTR_ERR(ev_ctx);
25906014661SAlastair D'Silva rc = ocxl_irq_set_handler(ctx, irq_id, irq_handler, irq_free, ev_ctx);
260c3b69ba5SHangyu Hua if (rc)
261c3b69ba5SHangyu Hua eventfd_ctx_put(ev_ctx);
262aeddad17SFrederic Barrat break;
263aeddad17SFrederic Barrat
26407c5ccd7SAlastair D'Silva case OCXL_IOCTL_GET_METADATA:
26507c5ccd7SAlastair D'Silva rc = afu_ioctl_get_metadata(ctx,
26607c5ccd7SAlastair D'Silva (struct ocxl_ioctl_metadata __user *) args);
26707c5ccd7SAlastair D'Silva break;
26807c5ccd7SAlastair D'Silva
269e948e06fSAlastair D'Silva #ifdef CONFIG_PPC64
270e948e06fSAlastair D'Silva case OCXL_IOCTL_ENABLE_P9_WAIT:
271e948e06fSAlastair D'Silva rc = afu_ioctl_enable_p9_wait(ctx,
272e948e06fSAlastair D'Silva (struct ocxl_ioctl_p9_wait __user *) args);
273e948e06fSAlastair D'Silva break;
274e948e06fSAlastair D'Silva #endif
275e948e06fSAlastair D'Silva
27602a8e5bcSAlastair D'Silva case OCXL_IOCTL_GET_FEATURES:
27702a8e5bcSAlastair D'Silva rc = afu_ioctl_get_features(ctx,
27802a8e5bcSAlastair D'Silva (struct ocxl_ioctl_features __user *) args);
27902a8e5bcSAlastair D'Silva break;
28002a8e5bcSAlastair D'Silva
2815ef3166eSFrederic Barrat default:
2825ef3166eSFrederic Barrat rc = -EINVAL;
2835ef3166eSFrederic Barrat }
2845ef3166eSFrederic Barrat return rc;
2855ef3166eSFrederic Barrat }
2865ef3166eSFrederic Barrat
afu_compat_ioctl(struct file * file,unsigned int cmd,unsigned long args)2875ef3166eSFrederic Barrat static long afu_compat_ioctl(struct file *file, unsigned int cmd,
2885ef3166eSFrederic Barrat unsigned long args)
2895ef3166eSFrederic Barrat {
2905ef3166eSFrederic Barrat return afu_ioctl(file, cmd, args);
2915ef3166eSFrederic Barrat }
2925ef3166eSFrederic Barrat
afu_mmap(struct file * file,struct vm_area_struct * vma)2935ef3166eSFrederic Barrat static int afu_mmap(struct file *file, struct vm_area_struct *vma)
2945ef3166eSFrederic Barrat {
2955ef3166eSFrederic Barrat struct ocxl_context *ctx = file->private_data;
2965ef3166eSFrederic Barrat
2975ef3166eSFrederic Barrat pr_debug("%s for context %d\n", __func__, ctx->pasid);
2985ef3166eSFrederic Barrat return ocxl_context_mmap(ctx, vma);
2995ef3166eSFrederic Barrat }
3005ef3166eSFrederic Barrat
has_xsl_error(struct ocxl_context * ctx)3015ef3166eSFrederic Barrat static bool has_xsl_error(struct ocxl_context *ctx)
3025ef3166eSFrederic Barrat {
3035ef3166eSFrederic Barrat bool ret;
3045ef3166eSFrederic Barrat
3055ef3166eSFrederic Barrat mutex_lock(&ctx->xsl_error_lock);
3065ef3166eSFrederic Barrat ret = !!ctx->xsl_error.addr;
3075ef3166eSFrederic Barrat mutex_unlock(&ctx->xsl_error_lock);
3085ef3166eSFrederic Barrat
3095ef3166eSFrederic Barrat return ret;
3105ef3166eSFrederic Barrat }
3115ef3166eSFrederic Barrat
3125ef3166eSFrederic Barrat /*
3135ef3166eSFrederic Barrat * Are there any events pending on the AFU
3145ef3166eSFrederic Barrat * ctx: The AFU context
3155ef3166eSFrederic Barrat * Returns: true if there are events pending
3165ef3166eSFrederic Barrat */
afu_events_pending(struct ocxl_context * ctx)3175ef3166eSFrederic Barrat static bool afu_events_pending(struct ocxl_context *ctx)
3185ef3166eSFrederic Barrat {
3195ef3166eSFrederic Barrat if (has_xsl_error(ctx))
3205ef3166eSFrederic Barrat return true;
3215ef3166eSFrederic Barrat return false;
3225ef3166eSFrederic Barrat }
3235ef3166eSFrederic Barrat
afu_poll(struct file * file,struct poll_table_struct * wait)3245ef3166eSFrederic Barrat static unsigned int afu_poll(struct file *file, struct poll_table_struct *wait)
3255ef3166eSFrederic Barrat {
3265ef3166eSFrederic Barrat struct ocxl_context *ctx = file->private_data;
3275ef3166eSFrederic Barrat unsigned int mask = 0;
3285ef3166eSFrederic Barrat bool closed;
3295ef3166eSFrederic Barrat
3305ef3166eSFrederic Barrat pr_debug("%s for context %d\n", __func__, ctx->pasid);
3315ef3166eSFrederic Barrat
3325ef3166eSFrederic Barrat poll_wait(file, &ctx->events_wq, wait);
3335ef3166eSFrederic Barrat
3345ef3166eSFrederic Barrat mutex_lock(&ctx->status_mutex);
3355ef3166eSFrederic Barrat closed = (ctx->status == CLOSED);
3365ef3166eSFrederic Barrat mutex_unlock(&ctx->status_mutex);
3375ef3166eSFrederic Barrat
3385ef3166eSFrederic Barrat if (afu_events_pending(ctx))
339a9a08845SLinus Torvalds mask = EPOLLIN | EPOLLRDNORM;
3405ef3166eSFrederic Barrat else if (closed)
341a9a08845SLinus Torvalds mask = EPOLLERR;
3425ef3166eSFrederic Barrat
3435ef3166eSFrederic Barrat return mask;
3445ef3166eSFrederic Barrat }
3455ef3166eSFrederic Barrat
3465ef3166eSFrederic Barrat /*
3475ef3166eSFrederic Barrat * Populate the supplied buffer with a single XSL error
3485ef3166eSFrederic Barrat * ctx: The AFU context to report the error from
3495ef3166eSFrederic Barrat * header: the event header to populate
3505ef3166eSFrederic Barrat * buf: The buffer to write the body into (should be at least
3515ef3166eSFrederic Barrat * AFU_EVENT_BODY_XSL_ERROR_SIZE)
3525ef3166eSFrederic Barrat * Return: the amount of buffer that was populated
3535ef3166eSFrederic Barrat */
append_xsl_error(struct ocxl_context * ctx,struct ocxl_kernel_event_header * header,char __user * buf)3545ef3166eSFrederic Barrat static ssize_t append_xsl_error(struct ocxl_context *ctx,
3555ef3166eSFrederic Barrat struct ocxl_kernel_event_header *header,
3565ef3166eSFrederic Barrat char __user *buf)
3575ef3166eSFrederic Barrat {
3585ef3166eSFrederic Barrat struct ocxl_kernel_event_xsl_fault_error body;
3595ef3166eSFrederic Barrat
3605ef3166eSFrederic Barrat memset(&body, 0, sizeof(body));
3615ef3166eSFrederic Barrat
3625ef3166eSFrederic Barrat mutex_lock(&ctx->xsl_error_lock);
3635ef3166eSFrederic Barrat if (!ctx->xsl_error.addr) {
3645ef3166eSFrederic Barrat mutex_unlock(&ctx->xsl_error_lock);
3655ef3166eSFrederic Barrat return 0;
3665ef3166eSFrederic Barrat }
3675ef3166eSFrederic Barrat
3685ef3166eSFrederic Barrat body.addr = ctx->xsl_error.addr;
3695ef3166eSFrederic Barrat body.dsisr = ctx->xsl_error.dsisr;
3705ef3166eSFrederic Barrat body.count = ctx->xsl_error.count;
3715ef3166eSFrederic Barrat
3725ef3166eSFrederic Barrat ctx->xsl_error.addr = 0;
3735ef3166eSFrederic Barrat ctx->xsl_error.dsisr = 0;
3745ef3166eSFrederic Barrat ctx->xsl_error.count = 0;
3755ef3166eSFrederic Barrat
3765ef3166eSFrederic Barrat mutex_unlock(&ctx->xsl_error_lock);
3775ef3166eSFrederic Barrat
3785ef3166eSFrederic Barrat header->type = OCXL_AFU_EVENT_XSL_FAULT_ERROR;
3795ef3166eSFrederic Barrat
3805ef3166eSFrederic Barrat if (copy_to_user(buf, &body, sizeof(body)))
3815ef3166eSFrederic Barrat return -EFAULT;
3825ef3166eSFrederic Barrat
3835ef3166eSFrederic Barrat return sizeof(body);
3845ef3166eSFrederic Barrat }
3855ef3166eSFrederic Barrat
3865ef3166eSFrederic Barrat #define AFU_EVENT_BODY_MAX_SIZE sizeof(struct ocxl_kernel_event_xsl_fault_error)
3875ef3166eSFrederic Barrat
3885ef3166eSFrederic Barrat /*
3895ef3166eSFrederic Barrat * Reports events on the AFU
3905ef3166eSFrederic Barrat * Format:
3915ef3166eSFrederic Barrat * Header (struct ocxl_kernel_event_header)
3925ef3166eSFrederic Barrat * Body (struct ocxl_kernel_event_*)
3935ef3166eSFrederic Barrat * Header...
3945ef3166eSFrederic Barrat */
afu_read(struct file * file,char __user * buf,size_t count,loff_t * off)3955ef3166eSFrederic Barrat static ssize_t afu_read(struct file *file, char __user *buf, size_t count,
3965ef3166eSFrederic Barrat loff_t *off)
3975ef3166eSFrederic Barrat {
3985ef3166eSFrederic Barrat struct ocxl_context *ctx = file->private_data;
3995ef3166eSFrederic Barrat struct ocxl_kernel_event_header header;
4005ef3166eSFrederic Barrat ssize_t rc;
401dedab7f0SColin Ian King ssize_t used = 0;
4025ef3166eSFrederic Barrat DEFINE_WAIT(event_wait);
4035ef3166eSFrederic Barrat
4045ef3166eSFrederic Barrat memset(&header, 0, sizeof(header));
4055ef3166eSFrederic Barrat
4065ef3166eSFrederic Barrat /* Require offset to be 0 */
4075ef3166eSFrederic Barrat if (*off != 0)
4085ef3166eSFrederic Barrat return -EINVAL;
4095ef3166eSFrederic Barrat
4105ef3166eSFrederic Barrat if (count < (sizeof(struct ocxl_kernel_event_header) +
4115ef3166eSFrederic Barrat AFU_EVENT_BODY_MAX_SIZE))
4125ef3166eSFrederic Barrat return -EINVAL;
4135ef3166eSFrederic Barrat
4145ef3166eSFrederic Barrat for (;;) {
4155ef3166eSFrederic Barrat prepare_to_wait(&ctx->events_wq, &event_wait,
4165ef3166eSFrederic Barrat TASK_INTERRUPTIBLE);
4175ef3166eSFrederic Barrat
4185ef3166eSFrederic Barrat if (afu_events_pending(ctx))
4195ef3166eSFrederic Barrat break;
4205ef3166eSFrederic Barrat
4215ef3166eSFrederic Barrat if (ctx->status == CLOSED)
4225ef3166eSFrederic Barrat break;
4235ef3166eSFrederic Barrat
4245ef3166eSFrederic Barrat if (file->f_flags & O_NONBLOCK) {
4255ef3166eSFrederic Barrat finish_wait(&ctx->events_wq, &event_wait);
4265ef3166eSFrederic Barrat return -EAGAIN;
4275ef3166eSFrederic Barrat }
4285ef3166eSFrederic Barrat
4295ef3166eSFrederic Barrat if (signal_pending(current)) {
4305ef3166eSFrederic Barrat finish_wait(&ctx->events_wq, &event_wait);
4315ef3166eSFrederic Barrat return -ERESTARTSYS;
4325ef3166eSFrederic Barrat }
4335ef3166eSFrederic Barrat
4345ef3166eSFrederic Barrat schedule();
4355ef3166eSFrederic Barrat }
4365ef3166eSFrederic Barrat
4375ef3166eSFrederic Barrat finish_wait(&ctx->events_wq, &event_wait);
4385ef3166eSFrederic Barrat
4395ef3166eSFrederic Barrat if (has_xsl_error(ctx)) {
4405ef3166eSFrederic Barrat used = append_xsl_error(ctx, &header, buf + sizeof(header));
4415ef3166eSFrederic Barrat if (used < 0)
4425ef3166eSFrederic Barrat return used;
4435ef3166eSFrederic Barrat }
4445ef3166eSFrederic Barrat
4455ef3166eSFrederic Barrat if (!afu_events_pending(ctx))
4465ef3166eSFrederic Barrat header.flags |= OCXL_KERNEL_EVENT_FLAG_LAST;
4475ef3166eSFrederic Barrat
4485ef3166eSFrederic Barrat if (copy_to_user(buf, &header, sizeof(header)))
4495ef3166eSFrederic Barrat return -EFAULT;
4505ef3166eSFrederic Barrat
4515ef3166eSFrederic Barrat used += sizeof(header);
4525ef3166eSFrederic Barrat
453423688abSFrederic Barrat rc = used;
4545ef3166eSFrederic Barrat return rc;
4555ef3166eSFrederic Barrat }
4565ef3166eSFrederic Barrat
afu_release(struct inode * inode,struct file * file)4575ef3166eSFrederic Barrat static int afu_release(struct inode *inode, struct file *file)
4585ef3166eSFrederic Barrat {
4595ef3166eSFrederic Barrat struct ocxl_context *ctx = file->private_data;
4605ef3166eSFrederic Barrat int rc;
4615ef3166eSFrederic Barrat
4625ef3166eSFrederic Barrat pr_debug("%s for device %x\n", __func__, inode->i_rdev);
4635ef3166eSFrederic Barrat rc = ocxl_context_detach(ctx);
4645ef3166eSFrederic Barrat mutex_lock(&ctx->mapping_lock);
4655ef3166eSFrederic Barrat ctx->mapping = NULL;
4665ef3166eSFrederic Barrat mutex_unlock(&ctx->mapping_lock);
4675ef3166eSFrederic Barrat wake_up_all(&ctx->events_wq);
4685ef3166eSFrederic Barrat if (rc != -EBUSY)
4695ef3166eSFrederic Barrat ocxl_context_free(ctx);
4705ef3166eSFrederic Barrat return 0;
4715ef3166eSFrederic Barrat }
4725ef3166eSFrederic Barrat
4735ef3166eSFrederic Barrat static const struct file_operations ocxl_afu_fops = {
4745ef3166eSFrederic Barrat .owner = THIS_MODULE,
4755ef3166eSFrederic Barrat .open = afu_open,
4765ef3166eSFrederic Barrat .unlocked_ioctl = afu_ioctl,
4775ef3166eSFrederic Barrat .compat_ioctl = afu_compat_ioctl,
4785ef3166eSFrederic Barrat .mmap = afu_mmap,
4795ef3166eSFrederic Barrat .poll = afu_poll,
4805ef3166eSFrederic Barrat .read = afu_read,
4815ef3166eSFrederic Barrat .release = afu_release,
4825ef3166eSFrederic Barrat };
4835ef3166eSFrederic Barrat
48475ca758aSAlastair D'Silva // Free the info struct
info_release(struct device * dev)48575ca758aSAlastair D'Silva static void info_release(struct device *dev)
48675ca758aSAlastair D'Silva {
48775ca758aSAlastair D'Silva struct ocxl_file_info *info = container_of(dev, struct ocxl_file_info, dev);
48875ca758aSAlastair D'Silva
48975ca758aSAlastair D'Silva ocxl_afu_put(info->afu);
49075ca758aSAlastair D'Silva kfree(info);
49175ca758aSAlastair D'Silva }
49275ca758aSAlastair D'Silva
ocxl_file_make_visible(struct ocxl_file_info * info)49375ca758aSAlastair D'Silva static int ocxl_file_make_visible(struct ocxl_file_info *info)
4945ef3166eSFrederic Barrat {
4955ef3166eSFrederic Barrat int rc;
4965ef3166eSFrederic Barrat
49775ca758aSAlastair D'Silva cdev_init(&info->cdev, &ocxl_afu_fops);
49875ca758aSAlastair D'Silva rc = cdev_add(&info->cdev, info->dev.devt, 1);
4995ef3166eSFrederic Barrat if (rc) {
50075ca758aSAlastair D'Silva dev_err(&info->dev, "Unable to add afu char device: %d\n", rc);
5015ef3166eSFrederic Barrat return rc;
5025ef3166eSFrederic Barrat }
50375ca758aSAlastair D'Silva
5045ef3166eSFrederic Barrat return 0;
5055ef3166eSFrederic Barrat }
5065ef3166eSFrederic Barrat
ocxl_file_make_invisible(struct ocxl_file_info * info)50775ca758aSAlastair D'Silva static void ocxl_file_make_invisible(struct ocxl_file_info *info)
5085ef3166eSFrederic Barrat {
50975ca758aSAlastair D'Silva cdev_del(&info->cdev);
5105ef3166eSFrederic Barrat }
5115ef3166eSFrederic Barrat
ocxl_file_register_afu(struct ocxl_afu * afu)51275ca758aSAlastair D'Silva int ocxl_file_register_afu(struct ocxl_afu *afu)
5135ef3166eSFrederic Barrat {
5145ef3166eSFrederic Barrat int minor;
51575ca758aSAlastair D'Silva int rc;
51675ca758aSAlastair D'Silva struct ocxl_file_info *info;
51775ca758aSAlastair D'Silva struct ocxl_fn *fn = afu->fn;
51875ca758aSAlastair D'Silva struct pci_dev *pci_dev = to_pci_dev(fn->dev.parent);
5195ef3166eSFrederic Barrat
52075ca758aSAlastair D'Silva info = kzalloc(sizeof(*info), GFP_KERNEL);
52175ca758aSAlastair D'Silva if (info == NULL)
52275ca758aSAlastair D'Silva return -ENOMEM;
52375ca758aSAlastair D'Silva
52475ca758aSAlastair D'Silva minor = allocate_minor(info);
52575ca758aSAlastair D'Silva if (minor < 0) {
52675ca758aSAlastair D'Silva kfree(info);
5275ef3166eSFrederic Barrat return minor;
5285ef3166eSFrederic Barrat }
5295ef3166eSFrederic Barrat
53075ca758aSAlastair D'Silva info->dev.parent = &fn->dev;
53175ca758aSAlastair D'Silva info->dev.devt = MKDEV(MAJOR(ocxl_dev), minor);
53275ca758aSAlastair D'Silva info->dev.class = ocxl_class;
53375ca758aSAlastair D'Silva info->dev.release = info_release;
53475ca758aSAlastair D'Silva
53575ca758aSAlastair D'Silva info->afu = afu;
53675ca758aSAlastair D'Silva ocxl_afu_get(afu);
53775ca758aSAlastair D'Silva
53875ca758aSAlastair D'Silva rc = dev_set_name(&info->dev, "%s.%s.%hhu",
53975ca758aSAlastair D'Silva afu->config.name, dev_name(&pci_dev->dev), afu->config.idx);
54075ca758aSAlastair D'Silva if (rc)
54175ca758aSAlastair D'Silva goto err_put;
54275ca758aSAlastair D'Silva
54375ca758aSAlastair D'Silva rc = device_register(&info->dev);
544a4cb1004SYang Yingliang if (rc) {
545a4cb1004SYang Yingliang free_minor(info);
546a4cb1004SYang Yingliang put_device(&info->dev);
547a4cb1004SYang Yingliang return rc;
548a4cb1004SYang Yingliang }
54975ca758aSAlastair D'Silva
55075ca758aSAlastair D'Silva rc = ocxl_sysfs_register_afu(info);
55175ca758aSAlastair D'Silva if (rc)
55275ca758aSAlastair D'Silva goto err_unregister;
55375ca758aSAlastair D'Silva
55475ca758aSAlastair D'Silva rc = ocxl_file_make_visible(info);
55575ca758aSAlastair D'Silva if (rc)
55675ca758aSAlastair D'Silva goto err_unregister;
55775ca758aSAlastair D'Silva
55875ca758aSAlastair D'Silva ocxl_afu_set_private(afu, info);
55975ca758aSAlastair D'Silva
56075ca758aSAlastair D'Silva return 0;
56175ca758aSAlastair D'Silva
56275ca758aSAlastair D'Silva err_unregister:
56375ca758aSAlastair D'Silva ocxl_sysfs_unregister_afu(info); // safe to call even if register failed
564950cf957SHangyu Hua free_minor(info);
56575ca758aSAlastair D'Silva device_unregister(&info->dev);
566950cf957SHangyu Hua return rc;
56775ca758aSAlastair D'Silva err_put:
56875ca758aSAlastair D'Silva ocxl_afu_put(afu);
56975ca758aSAlastair D'Silva free_minor(info);
57075ca758aSAlastair D'Silva kfree(info);
57175ca758aSAlastair D'Silva return rc;
57275ca758aSAlastair D'Silva }
57375ca758aSAlastair D'Silva
ocxl_file_unregister_afu(struct ocxl_afu * afu)57475ca758aSAlastair D'Silva void ocxl_file_unregister_afu(struct ocxl_afu *afu)
5755ef3166eSFrederic Barrat {
57675ca758aSAlastair D'Silva struct ocxl_file_info *info = ocxl_afu_get_private(afu);
57775ca758aSAlastair D'Silva
57875ca758aSAlastair D'Silva if (!info)
57975ca758aSAlastair D'Silva return;
58075ca758aSAlastair D'Silva
58175ca758aSAlastair D'Silva ocxl_file_make_invisible(info);
58275ca758aSAlastair D'Silva ocxl_sysfs_unregister_afu(info);
583a58d37bcSFrederic Barrat free_minor(info);
58475ca758aSAlastair D'Silva device_unregister(&info->dev);
5855ef3166eSFrederic Barrat }
5865ef3166eSFrederic Barrat
ocxl_devnode(const struct device * dev,umode_t * mode)587fb12940fSGreg Kroah-Hartman static char *ocxl_devnode(const struct device *dev, umode_t *mode)
5885ef3166eSFrederic Barrat {
5895ef3166eSFrederic Barrat return kasprintf(GFP_KERNEL, "ocxl/%s", dev_name(dev));
5905ef3166eSFrederic Barrat }
5915ef3166eSFrederic Barrat
ocxl_file_init(void)5925ef3166eSFrederic Barrat int ocxl_file_init(void)
5935ef3166eSFrederic Barrat {
5945ef3166eSFrederic Barrat int rc;
5955ef3166eSFrederic Barrat
5965ef3166eSFrederic Barrat idr_init(&minors_idr);
5975ef3166eSFrederic Barrat
5985ef3166eSFrederic Barrat rc = alloc_chrdev_region(&ocxl_dev, 0, OCXL_NUM_MINORS, "ocxl");
5995ef3166eSFrederic Barrat if (rc) {
6005ef3166eSFrederic Barrat pr_err("Unable to allocate ocxl major number: %d\n", rc);
6015ef3166eSFrederic Barrat return rc;
6025ef3166eSFrederic Barrat }
6035ef3166eSFrederic Barrat
604*1aaba11dSGreg Kroah-Hartman ocxl_class = class_create("ocxl");
6055ef3166eSFrederic Barrat if (IS_ERR(ocxl_class)) {
6065ef3166eSFrederic Barrat pr_err("Unable to create ocxl class\n");
6075ef3166eSFrederic Barrat unregister_chrdev_region(ocxl_dev, OCXL_NUM_MINORS);
6085ef3166eSFrederic Barrat return PTR_ERR(ocxl_class);
6095ef3166eSFrederic Barrat }
6105ef3166eSFrederic Barrat
6115ef3166eSFrederic Barrat ocxl_class->devnode = ocxl_devnode;
6125ef3166eSFrederic Barrat return 0;
6135ef3166eSFrederic Barrat }
6145ef3166eSFrederic Barrat
ocxl_file_exit(void)6155ef3166eSFrederic Barrat void ocxl_file_exit(void)
6165ef3166eSFrederic Barrat {
6175ef3166eSFrederic Barrat class_destroy(ocxl_class);
6185ef3166eSFrederic Barrat unregister_chrdev_region(ocxl_dev, OCXL_NUM_MINORS);
6195ef3166eSFrederic Barrat idr_destroy(&minors_idr);
6205ef3166eSFrederic Barrat }
621