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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* GSP vGPU-IO Driver - WPR (Write/Read Protect Region) Management
*/
#include "gsp_core.h"
#include <linux/slab.h>
#include <linux/list.h>
/* WPR Payload (for RPC) */
struct gsp_wpr_payload {
uint32_t vf_id;
uint32_t op; /* 0=protect_write, 1=protect_read, 2=unprotect */
uint64_t base;
uint64_t size;
uint32_t flags;
uint64_t timeout_ns;
} __attribute__((packed));
struct gsp_wpr_response {
int64_t status;
} __attribute__((packed));
/* WPR Initialization */
int gsp_vf_wpr_init(struct gsp_vf *vf)
{
INIT_LIST_HEAD(&vf->wpr_list);
mutex_init(&vf->wpr_lock);
return 0;
}
void gsp_vf_wpr_fini(struct gsp_vf *vf)
{
struct gsp_wpr_region *rgn, *tmp;
mutex_lock(&vf->wpr_lock);
list_for_each_entry_safe(rgn, tmp, &vf->wpr_list, list) {
list_del(&rgn->list);
kfree(rgn);
}
mutex_unlock(&vf->wpr_lock);
}
/* Protect Region (Write) */
int gsp_vf_wpr_protect_write(struct gsp_vf *vf, uint64_t base, uint64_t size)
{
return gsp_vf_wpr_protect(vf, base, size, GSP_WPR_WRITE);
}
/* Protect Region (Read) */
int gsp_vf_wpr_protect_read(struct gsp_vf *vf, uint64_t base, uint64_t size)
{
return gsp_vf_wpr_protect(vf, base, size, GSP_WPR_READ);
}
/* Generic Protect */
int gsp_vf_wpr_protect(struct gsp_vf *vf, uint64_t base, uint64_t size, uint32_t flags)
{
struct gsp_wpr_payload payload = {
.vf_id = vf->id,
.op = (flags & GSP_WPR_READ) ? 1 : 0,
.base = base,
.size = size,
.flags = flags,
.timeout_ns = 10000000, /* 10ms default */
};
struct gsp_wpr_response resp;
size_t resp_size = sizeof(resp);
struct gsp_wpr_region *rgn;
int ret;
/* Validate alignment */
if (base & 0xFFF || size & 0xFFF)
return -EINVAL;
rgn = kzalloc(sizeof(*rgn), GFP_KERNEL);
if (!rgn)
return -ENOMEM;
rgn->base = base;
rgn->size = size;
rgn->flags = flags;
rgn->vf_id = vf->id;
rgn->timeout_ns = payload.timeout_ns;
/* In emulation mode, handle locally */
if (emulation_mode) {
mutex_lock(&vf->wpr_lock);
list_add(&rgn->list, &vf->wpr_list);
mutex_unlock(&vf->wpr_lock);
dev_dbg(vf->gsp->dev, "VF %u: WPR protect [0x%llx, 0x%llx) flags=0x%x (emulation)\n",
vf->id, base, base + size, flags);
return 0;
}
/* Send to GSP WPR handler (0x04F00B0C/0x04F00C78) */
ret = gsp_rpc_send_sync(vf->gsp->rpc, GSP_RPC_MAP, /* Uses MAP RPC for WPR */
&payload, sizeof(payload), &resp, &resp_size);
if (ret) {
kfree(rgn);
return ret;
}
if (resp.status != 0) {
kfree(rgn);
return gsp_errno_to_errno(resp.status);
}
mutex_lock(&vf->wpr_lock);
list_add(&rgn->list, &vf->wpr_list);
mutex_unlock(&vf->wpr_lock);
dev_dbg(vf->gsp->dev, "VF %u: WPR protect [0x%llx, 0x%llx) flags=0x%x\n",
vf->id, base, base + size, flags);
return 0;
}
/* Unprotect Region */
int gsp_vf_wpr_unprotect(struct gsp_vf *vf, uint64_t base)
{
struct gsp_wpr_payload payload = {
.vf_id = vf->id,
.op = 2, /* unprotect */
.base = base,
.size = 0,
.flags = 0,
};
struct gsp_wpr_response resp;
size_t resp_size = sizeof(resp);
struct gsp_wpr_region *rgn, *tmp;
bool found = false;
int ret;
/* In emulation mode, handle locally */
if (emulation_mode) {
mutex_lock(&vf->wpr_lock);
list_for_each_entry_safe(rgn, tmp, &vf->wpr_list, list) {
if (rgn->base == base) {
list_del(&rgn->list);
kfree(rgn);
found = true;
break;
}
}
mutex_unlock(&vf->wpr_lock);
dev_dbg(vf->gsp->dev, "VF %u: WPR unprotect 0x%llx (emulation)\n", vf->id, base);
return found ? 0 : -ENOENT;
}
ret = gsp_rpc_send_sync(vf->gsp->rpc, GSP_RPC_UNMAP, /* Uses UNMAP for WPR */
&payload, sizeof(payload), &resp, &resp_size);
if (ret)
return ret;
if (resp.status != 0)
return gsp_errno_to_errno(resp.status);
mutex_lock(&vf->wpr_lock);
list_for_each_entry_safe(rgn, tmp, &vf->wpr_list, list) {
if (rgn->base == base) {
list_del(&rgn->list);
kfree(rgn);
found = true;
break;
}
}
mutex_unlock(&vf->wpr_lock);
if (!found)
return -ENOENT;
dev_dbg(vf->gsp->dev, "VF %u: WPR unprotect 0x%llx\n", vf->id, base);
return 0;
}
/* Set Timeout */
int gsp_vf_wpr_set_timeout(struct gsp_vf *vf, uint64_t timeout_ns)
{
/* Update timeout for all WPR regions */
struct gsp_wpr_region *rgn;
mutex_lock(&vf->wpr_lock);
list_for_each_entry(rgn, &vf->wpr_list, list) {
rgn->timeout_ns = timeout_ns;
}
mutex_unlock(&vf->wpr_lock);
return 0;
}
/* Register Completion Callback */
int gsp_vf_wpr_register_callback(struct gsp_vf *vf, enum gsp_wpr_event type,
void (*cb)(struct gsp_vf *, uint64_t, uint32_t),
void *ctx)
{
struct gsp_wpr_region *rgn;
mutex_lock(&vf->wpr_lock);
list_for_each_entry(rgn, &vf->wpr_list, list) {
switch (type) {
case GSP_WPR_WRITE_COMPLETE:
case GSP_WPR_WRITE_TIMEOUT:
rgn->completion_cb = cb;
break;
case GSP_WPR_READ_COMPLETE:
case GSP_WPR_READ_TIMEOUT:
rgn->timeout_cb = cb;
break;
}
}
mutex_unlock(&vf->wpr_lock);
return 0;
}
/* WPR Event Handler (called from notification) */
void gsp_wpr_handle_event(struct gsp_device *gsp, struct gsp_rpc_message *msg)
{
struct gsp_rpc_response *resp = (struct gsp_rpc_response *)msg->payload;
uint32_t event_type = resp->payload[0];
uint32_t vf_id = resp->payload[1];
uint64_t address = *(uint64_t *)&resp->payload[2];
struct gsp_vf *vf;
struct gsp_wpr_region *rgn;
vf = gsp_vf_get(gsp, vf_id);
if (!vf)
return;
atomic64_inc(&gsp->wpr_events);
mutex_lock(&vf->wpr_lock);
list_for_each_entry(rgn, &vf->wpr_list, list) {
if (address >= rgn->base && address < rgn->base + rgn->size) {
switch (event_type) {
case GSP_WPR_WRITE_COMPLETE:
case GSP_WPR_READ_COMPLETE:
if (rgn->completion_cb)
rgn->completion_cb(vf, address, event_type);
break;
case GSP_WPR_WRITE_TIMEOUT:
case GSP_WPR_READ_TIMEOUT:
if (rgn->timeout_cb)
rgn->timeout_cb(vf, address, event_type);
break;
}
break;
}
}
mutex_unlock(&vf->wpr_lock);
gsp_vf_put(vf);
}
/* Default Completion Callback */
void gsp_wpr_default_complete_cb(struct gsp_vf *vf, uint64_t addr, uint32_t type)
{
dev_dbg(vf->gsp->dev, "VF %u: WPR %s complete at 0x%llx\n",
vf->id, type == GSP_WPR_WRITE_COMPLETE ? "write" : "read", addr);
/* If this was a page table write, invalidate TLB */
if (addr >= vf->pt_base && addr < vf->pt_base + vf->pt_size) {
/* TODO: TLB invalidate */
}
}
/* Default Timeout Callback */
void gsp_wpr_default_timeout_cb(struct gsp_vf *vf, uint64_t addr, uint32_t type)
{
dev_warn(vf->gsp->dev, "VF %u: WPR %s timeout at 0x%llx\n",
vf->id, type == GSP_WPR_WRITE_TIMEOUT ? "write" : "read", addr);
/* Throttle or reset VF */
if (type == GSP_WPR_WRITE_TIMEOUT) {
/* TODO: VF throttle */
} else {
/* TODO: VF reset */
}
}
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