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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* GSP vGPU-IO Driver - BAR Emulation
*/
#include "gsp_core.h"
#include <linux/slab.h>
#include <linux/vmalloc.h>
/* BAR Emulation Ops */
static int gsp_bar_trap_handler(struct gsp_vf *vf, struct gsp_bar_trap_payload *trap)
{
struct gsp_bar_state *bar = &vf->bar_state;
struct gsp_bar_trap_response resp = {0};
size_t resp_size = sizeof(resp);
int ret;
/* Validate BAR index (we only support BAR1) */
if (trap->bar_index != 1)
return -EINVAL;
/* Validate offset */
if (trap->offset >= bar->aperture_size)
return -ERANGE;
/* Check ForceBarAccess */
if (bar->force_access && vf->id != bar->force_vf)
return -EPERM;
/* In emulation mode, handle locally */
if (emulation_mode) {
/* Simulate BAR trap handling */
if (trap->trap_type == GSP_BAR_WRITE) {
/* Config write - update aperture */
bar->aperture_offset = trap->offset;
bar->aperture_size = trap->value;
} else if (trap->trap_type == GSP_BAR_ATOMIC) {
/* Force access control */
bar->force_access = trap->offset ? true : false;
bar->force_vf = trap->offset ? vf->id : 0;
}
resp.value = 0;
return 0;
}
/* Forward to GSP BAR trap handler (0x04CB8188) */
ret = gsp_rpc_send_sync(vf->gsp->rpc, GSP_RPC_BAR_TRAP,
trap, sizeof(*trap), &resp, &resp_size);
return ret;
}
/* Aperture Configuration */
static int gsp_bar_config_aperture(struct gsp_vf *vf, uint64_t offset, uint64_t size)
{
struct gsp_bar_state *bar = &vf->bar_state;
struct gsp_bar_trap_payload payload = {0};
struct gsp_bar_trap_response resp = {0};
size_t resp_size = sizeof(resp);
int ret;
/* Validate alignment (4KB) */
if (offset & 0xFFF || size & 0xFFF)
return -EINVAL;
/* Validate max size (256KB per firmware) */
if (size > 0x40000)
return -EINVAL;
/* In emulation mode, handle locally */
if (emulation_mode) {
bar->aperture_offset = offset;
bar->aperture_size = size;
return 0;
}
payload.bar_index = 1;
payload.trap_type = GSP_BAR_WRITE; /* Config write */
payload.offset = offset;
payload.value = size;
payload.size = 8;
payload.vf_id = vf->id;
ret = gsp_rpc_send_sync(vf->gsp->rpc, GSP_RPC_BAR_TRAP,
&payload, sizeof(payload), &resp, &resp_size);
if (!ret) {
bar->aperture_offset = offset;
bar->aperture_size = size;
}
return ret;
}
/* ForceBarAccess Control */
int gsp_bar_force_access(struct gsp_vf *vf, bool enable)
{
struct gsp_bar_state *bar = &vf->bar_state;
struct gsp_bar_trap_payload payload = {0};
struct gsp_bar_trap_response resp = {0};
size_t resp_size = sizeof(resp);
int ret;
/* In emulation mode, handle locally */
if (emulation_mode) {
bar->force_access = enable;
bar->force_vf = enable ? vf->id : 0;
return 0;
}
payload.bar_index = 1;
payload.trap_type = GSP_BAR_ATOMIC; /* Force access control */
payload.offset = enable ? 1 : 0;
payload.value = enable ? vf->id : 0;
payload.size = 8;
payload.vf_id = vf->id;
ret = gsp_rpc_send_sync(vf->gsp->rpc, GSP_RPC_BAR_TRAP,
&payload, sizeof(payload), &resp, &resp_size);
if (!ret) {
bar->force_access = enable;
bar->force_vf = enable ? vf->id : 0;
}
return ret;
}
/* State Save for Migration */
static int gsp_bar_save_state(struct gsp_vf *vf, void *buf, size_t *size)
{
struct gsp_bar_state *bar = &vf->bar_state;
size_t needed = sizeof(*bar) + bar->backing_size;
if (!buf || *size < needed)
return -ENOSPC;
memcpy(buf, bar, sizeof(*bar));
if (bar->backing_store && bar->backing_size > 0)
memcpy(buf + sizeof(*bar), bar->backing_store, bar->backing_size);
*size = needed;
return 0;
}
/* State Restore for Migration */
static int gsp_bar_restore_state(struct gsp_vf *vf, void *buf, size_t size)
{
struct gsp_bar_state *bar = &vf->bar_state;
size_t min_size = sizeof(*bar);
if (!buf || size < min_size)
return -EINVAL;
memcpy(bar, buf, sizeof(*bar));
if (size > min_size && bar->backing_size > 0) {
if (!bar->backing_store) {
bar->backing_store = vzalloc(bar->backing_size);
if (!bar->backing_store)
return -ENOMEM;
}
memcpy(bar->backing_store, buf + min_size,
min(size - min_size, bar->backing_size));
}
/* Reconfigure BAR in GSP */
return gsp_bar_config_aperture(vf, bar->aperture_offset, bar->aperture_size);
}
/* VF BAR Initialization */
int gsp_vf_bar_init(struct gsp_vf *vf)
{
struct gsp_bar_state *bar = &vf->bar_state;
int ret;
/* Initialize with config values */
bar->aperture_offset = vf->bar1_offset;
bar->aperture_size = vf->bar1_size;
bar->force_access = false;
bar->force_vf = 0;
bar->backing_store = NULL;
bar->backing_size = 0;
/* Allocate backing store (max 256KB) */
if (bar->aperture_size > 0) {
bar->backing_size = min(bar->aperture_size, (uint64_t)0x40000);
bar->backing_store = vzalloc(bar->backing_size);
if (!bar->backing_store)
return -ENOMEM;
}
/* Configure aperture in GSP (skip in emulation mode) */
if (!emulation_mode) {
ret = gsp_bar_config_aperture(vf, bar->aperture_offset, bar->aperture_size);
if (ret) {
dev_err(vf->gsp->dev, "VF %u: BAR aperture config failed: %d\n", vf->id, ret);
goto err_backing;
}
} else {
dev_info(vf->gsp->dev, "VF %u: BAR1 initialized in emulation mode [0x%llx, 0x%llx)\n",
vf->id, bar->aperture_offset, bar->aperture_offset + bar->aperture_size);
}
dev_info(vf->gsp->dev, "VF %u: BAR1 initialized [0x%llx, 0x%llx)\n",
vf->id, bar->aperture_offset, bar->aperture_offset + bar->aperture_size);
return 0;
err_backing:
vfree(bar->backing_store);
bar->backing_store = NULL;
bar->backing_size = 0;
return ret;
}
/* VF BAR Cleanup */
void gsp_vf_bar_fini(struct gsp_vf *vf)
{
struct gsp_bar_state *bar = &vf->bar_state;
vfree(bar->backing_store);
bar->backing_store = NULL;
bar->backing_size = 0;
dev_info(vf->gsp->dev, "VF %u: BAR1 cleaned up\n", vf->id);
}
/* BAR Trap Entry Point (called from ISR/notification) */
int gsp_vf_bar_trap(struct gsp_vf *vf, struct gsp_bar_trap_payload *trap)
{
return gsp_bar_trap_handler(vf, trap);
}
/* Migration Interface */
int gsp_migration_bar_save(struct gsp_vf *vf, void *buf, size_t *size)
{
return gsp_bar_save_state(vf, buf, size);
}
int gsp_migration_bar_restore(struct gsp_vf *vf, void *buf, size_t size)
{
return gsp_bar_restore_state(vf, buf, size);
}
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