Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Copyright 2014 IBM Corp.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/bitmap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/pid.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/debugfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/idr.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/sched/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/mmu_context.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <asm/cputable.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <asm/current.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <asm/copro.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include "cxl.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25)  * Allocates space for a CXL context.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) struct cxl_context *cxl_context_alloc(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	return kzalloc(sizeof(struct cxl_context), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) }
^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)  * Initialises a CXL context.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) int cxl_context_init(struct cxl_context *ctx, struct cxl_afu *afu, bool master)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	ctx->afu = afu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	ctx->master = master;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	ctx->pid = NULL; /* Set in start work ioctl */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	mutex_init(&ctx->mapping_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	ctx->mapping = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	ctx->tidr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	ctx->assign_tidr = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	if (cxl_is_power8()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 		spin_lock_init(&ctx->sste_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		 * Allocate the segment table before we put it in the IDR so that we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		 * can always access it when dereferenced from IDR. For the same
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 		 * reason, the segment table is only destroyed after the context is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 		 * removed from the IDR.  Access to this in the IOCTL is protected by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 		 * Linux filesytem symantics (can't IOCTL until open is complete).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 		i = cxl_alloc_sst(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 		if (i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 			return i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	INIT_WORK(&ctx->fault_work, cxl_handle_fault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	init_waitqueue_head(&ctx->wq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	spin_lock_init(&ctx->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	ctx->irq_bitmap = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	ctx->pending_irq = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	ctx->pending_fault = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	ctx->pending_afu_err = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	INIT_LIST_HEAD(&ctx->irq_names);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	 * When we have to destroy all contexts in cxl_context_detach_all() we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	 * end up with afu_release_irqs() called from inside a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	 * idr_for_each_entry(). Hence we need to make sure that anything
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	 * dereferenced from this IDR is ok before we allocate the IDR here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	 * This clears out the IRQ ranges to ensure this.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	for (i = 0; i < CXL_IRQ_RANGES; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		ctx->irqs.range[i] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	mutex_init(&ctx->status_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	ctx->status = OPENED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	 * Allocating IDR! We better make sure everything's setup that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	 * dereferences from it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	mutex_lock(&afu->contexts_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	idr_preload(GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	i = idr_alloc(&ctx->afu->contexts_idr, ctx, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		      ctx->afu->num_procs, GFP_NOWAIT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	idr_preload_end();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	mutex_unlock(&afu->contexts_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	if (i < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		return i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	ctx->pe = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	if (cpu_has_feature(CPU_FTR_HVMODE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		ctx->elem = &ctx->afu->native->spa[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		ctx->external_pe = ctx->pe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		ctx->external_pe = -1; /* assigned when attaching */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	ctx->pe_inserted = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	 * take a ref on the afu so that it stays alive at-least till
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	 * this context is reclaimed inside reclaim_ctx.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	cxl_afu_get(afu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) void cxl_context_set_mapping(struct cxl_context *ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 			struct address_space *mapping)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	mutex_lock(&ctx->mapping_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	ctx->mapping = mapping;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	mutex_unlock(&ctx->mapping_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) static vm_fault_t cxl_mmap_fault(struct vm_fault *vmf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	struct vm_area_struct *vma = vmf->vma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	struct cxl_context *ctx = vma->vm_file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	u64 area, offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	vm_fault_t ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	offset = vmf->pgoff << PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	pr_devel("%s: pe: %i address: 0x%lx offset: 0x%llx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 			__func__, ctx->pe, vmf->address, offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	if (ctx->afu->current_mode == CXL_MODE_DEDICATED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		area = ctx->afu->psn_phys;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 		if (offset >= ctx->afu->adapter->ps_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 			return VM_FAULT_SIGBUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		area = ctx->psn_phys;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		if (offset >= ctx->psn_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 			return VM_FAULT_SIGBUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	mutex_lock(&ctx->status_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	if (ctx->status != STARTED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		mutex_unlock(&ctx->status_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		pr_devel("%s: Context not started, failing problem state access\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		if (ctx->mmio_err_ff) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 			if (!ctx->ff_page) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 				ctx->ff_page = alloc_page(GFP_USER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 				if (!ctx->ff_page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 					return VM_FAULT_OOM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 				memset(page_address(ctx->ff_page), 0xff, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 			get_page(ctx->ff_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 			vmf->page = ctx->ff_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 			vma->vm_page_prot = pgprot_cached(vma->vm_page_prot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 			return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		return VM_FAULT_SIGBUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	ret = vmf_insert_pfn(vma, vmf->address, (area + offset) >> PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	mutex_unlock(&ctx->status_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) static const struct vm_operations_struct cxl_mmap_vmops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	.fault = cxl_mmap_fault,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)  * Map a per-context mmio space into the given vma.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) int cxl_context_iomap(struct cxl_context *ctx, struct vm_area_struct *vma)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	u64 start = vma->vm_pgoff << PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	u64 len = vma->vm_end - vma->vm_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	if (ctx->afu->current_mode == CXL_MODE_DEDICATED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		if (start + len > ctx->afu->adapter->ps_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		if (cxl_is_power9()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 			 * Make sure there is a valid problem state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 			 * area space for this AFU.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 			if (ctx->master && !ctx->afu->psa) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 				pr_devel("AFU doesn't support mmio space\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 				return -EINVAL;
^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) 			/* Can't mmap until the AFU is enabled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 			if (!ctx->afu->enabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 				return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		if (start + len > ctx->psn_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		/* Make sure there is a valid per process space for this AFU */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		if ((ctx->master && !ctx->afu->psa) || (!ctx->afu->pp_psa)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 			pr_devel("AFU doesn't support mmio space\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		/* Can't mmap until the AFU is enabled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		if (!ctx->afu->enabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 			return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	pr_devel("%s: mmio physical: %llx pe: %i master:%i\n", __func__,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		 ctx->psn_phys, ctx->pe , ctx->master);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	vma->vm_flags |= VM_IO | VM_PFNMAP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	vma->vm_ops = &cxl_mmap_vmops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)  * Detach a context from the hardware. This disables interrupts and doesn't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)  * return until all outstanding interrupts for this context have completed. The
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232)  * hardware should no longer access *ctx after this has returned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) int __detach_context(struct cxl_context *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	enum cxl_context_status status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	mutex_lock(&ctx->status_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	status = ctx->status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	ctx->status = CLOSED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	mutex_unlock(&ctx->status_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	if (status != STARTED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	/* Only warn if we detached while the link was OK.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	 * If detach fails when hw is down, we don't care.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	WARN_ON(cxl_ops->detach_process(ctx) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		cxl_ops->link_ok(ctx->afu->adapter, ctx->afu));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	flush_work(&ctx->fault_work); /* Only needed for dedicated process */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	 * Wait until no further interrupts are presented by the PSL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	 * for this context.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	if (cxl_ops->irq_wait)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		cxl_ops->irq_wait(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	/* release the reference to the group leader and mm handling pid */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	put_pid(ctx->pid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	cxl_ctx_put();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	/* Decrease the attached context count on the adapter */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	cxl_adapter_context_put(ctx->afu->adapter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	/* Decrease the mm count on the context */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	cxl_context_mm_count_put(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	if (ctx->mm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 		mm_context_remove_copro(ctx->mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	ctx->mm = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)  * Detach the given context from the AFU. This doesn't actually
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)  * free the context but it should stop the context running in hardware
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)  * (ie. prevent this context from generating any further interrupts
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)  * so that it can be freed).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) void cxl_context_detach(struct cxl_context *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	rc = __detach_context(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	afu_release_irqs(ctx, ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	wake_up_all(&ctx->wq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295)  * Detach all contexts on the given AFU.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) void cxl_context_detach_all(struct cxl_afu *afu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	struct cxl_context *ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	int tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	mutex_lock(&afu->contexts_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	idr_for_each_entry(&afu->contexts_idr, ctx, tmp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 		 * Anything done in here needs to be setup before the IDR is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		 * created and torn down after the IDR removed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 		cxl_context_detach(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 		 * We are force detaching - remove any active PSA mappings so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 		 * userspace cannot interfere with the card if it comes back.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 		 * Easiest way to exercise this is to unbind and rebind the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 		 * driver via sysfs while it is in use.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 		mutex_lock(&ctx->mapping_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 		if (ctx->mapping)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 			unmap_mapping_range(ctx->mapping, 0, 0, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 		mutex_unlock(&ctx->mapping_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	mutex_unlock(&afu->contexts_lock);
^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 void reclaim_ctx(struct rcu_head *rcu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	struct cxl_context *ctx = container_of(rcu, struct cxl_context, rcu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	if (cxl_is_power8())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 		free_page((u64)ctx->sstp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	if (ctx->ff_page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 		__free_page(ctx->ff_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	ctx->sstp = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	kfree(ctx->irq_bitmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	/* Drop ref to the afu device taken during cxl_context_init */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	cxl_afu_put(ctx->afu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	kfree(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) void cxl_context_free(struct cxl_context *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	if (ctx->kernelapi && ctx->mapping)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 		cxl_release_mapping(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	mutex_lock(&ctx->afu->contexts_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	idr_remove(&ctx->afu->contexts_idr, ctx->pe);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	mutex_unlock(&ctx->afu->contexts_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	call_rcu(&ctx->rcu, reclaim_ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) void cxl_context_mm_count_get(struct cxl_context *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	if (ctx->mm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 		mmgrab(ctx->mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) void cxl_context_mm_count_put(struct cxl_context *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	if (ctx->mm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 		mmdrop(ctx->mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) }