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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* GSP vGPU-IO Driver - VF Management
*/
#include "gsp_core.h"
#include <linux/slab.h>
#include <linux/idr.h>
#include <linux/list.h>
/* VF Reference Counting */
static void gsp_vf_release(struct kref *ref)
{
struct gsp_vf *vf = container_of(ref, struct gsp_vf, ref);
kfree(vf);
}
struct gsp_vf *gsp_vf_get(struct gsp_device *gsp, uint32_t id)
{
struct gsp_vf *vf;
mutex_lock(&gsp->vf_lock);
vf = idr_find(&gsp->vf_idr, id);
if (vf && vf->active)
kref_get(&vf->ref);
else
vf = NULL;
mutex_unlock(&gsp->vf_lock);
return vf;
}
void gsp_vf_put(struct gsp_vf *vf)
{
if (vf)
kref_put(&vf->ref, gsp_vf_release);
}
/* VF Creation */
int gsp_vf_create(struct gsp_device *gsp, const struct gsp_vf_config *config)
{
struct gsp_vf *vf;
int ret, id;
if (!config || config->id == 0 || config->id > gsp->max_vfs)
return -EINVAL;
vf = kzalloc(sizeof(*vf), GFP_KERNEL);
if (!vf)
return -ENOMEM;
vf->gsp = gsp;
vf->id = config->id;
kref_init(&vf->ref);
mutex_init(&vf->lock);
mutex_init(&vf->wpr_lock);
INIT_LIST_HEAD(&vf->wpr_list);
INIT_LIST_HEAD(&vf->list);
atomic_set(&vf->refcount, 1);
/* Copy configuration */
vf->bar1_offset = config->bar1_offset;
vf->bar1_size = config->bar1_size;
vf->pt_base = config->pt_base;
vf->pt_size = config->pt_size;
vf->cmd_base = config->cmd_base;
vf->cmd_size = config->cmd_size;
/* Allocate VF ID */
mutex_lock(&gsp->vf_lock);
id = idr_alloc(&gsp->vf_idr, vf, config->id, config->id + 1, GFP_KERNEL);
if (id < 0) {
ret = id;
mutex_unlock(&gsp->vf_lock);
goto err_free;
}
list_add(&vf->list, &gsp->vf_list);
vf->active = true;
vf->state = GSP_VF_ACTIVE;
mutex_unlock(&gsp->vf_lock);
/* Initialize subsystems */
ret = gsp_vf_wpr_init(vf);
if (ret) {
dev_err(gsp->dev, "VF %u: WPR init failed: %d\n", vf->id, ret);
goto err_wpr;
}
ret = gsp_vf_bar_init(vf);
if (ret) {
dev_err(gsp->dev, "VF %u: BAR init failed: %d\n", vf->id, ret);
goto err_bar;
}
dev_info(gsp->dev, "VF %u created (bar1=0x%llx-0x%llx, pt=0x%llx-0x%llx)\n",
vf->id, vf->bar1_offset, vf->bar1_offset + vf->bar1_size,
vf->pt_base, vf->pt_base + vf->pt_size);
return 0;
err_bar:
gsp_vf_wpr_fini(vf);
err_wpr:
mutex_lock(&gsp->vf_lock);
list_del(&vf->list);
idr_remove(&gsp->vf_idr, vf->id);
vf->active = false;
mutex_unlock(&gsp->vf_lock);
err_free:
kfree(vf);
return ret;
}
/* VF Destruction */
void gsp_vf_destroy(struct gsp_vf *vf)
{
struct gsp_device *gsp = vf->gsp;
uint32_t id = vf->id;
if (!vf->active)
return;
/* Cancel any ongoing migration */
mutex_lock(&vf->lock);
if (vf->migration) {
gsp_migration_cancel(vf->migration);
vf->migration = NULL;
}
vf->active = false;
vf->state = GSP_VF_DESTROYING;
mutex_unlock(&vf->lock);
/* Remove from device lists */
mutex_lock(&gsp->vf_lock);
list_del(&vf->list);
idr_remove(&gsp->vf_idr, id);
mutex_unlock(&gsp->vf_lock);
/* Cleanup subsystems */
gsp_vf_bar_fini(vf);
gsp_vf_wpr_fini(vf);
dev_info(gsp->dev, "VF %u destroyed\n", id);
gsp_vf_put(vf);
}
/* Memory Allocation */
int gsp_vf_mem_alloc(struct gsp_vf *vf, uint64_t size, uint32_t flags,
uint64_t *handle, uint64_t *va)
{
struct gsp_alloc_payload payload = {
.size = size,
.type = flags & 0x3, /* Low bits: mem type */
.alignment = 0x1000,
.va_hint = 0,
.flags = flags >> 2,
.pid = current->pid,
.vf_id = vf->id,
};
struct gsp_alloc_response resp;
size_t resp_size = sizeof(resp);
int ret;
if (!handle || !va)
return -EINVAL;
/* In emulation mode, handle locally */
if (emulation_mode) {
static uint64_t next_handle = 0x1000;
static uint64_t next_va = 0x100000000ULL; /* 4GB base */
*handle = next_handle++;
*va = next_va;
next_va += (size + 0xFFF) & ~0xFFF; /* Align to 4KB */
dev_dbg(vf->gsp->dev, "VF %u: alloc handle=0x%llx va=0x%llx size=0x%llx (emulation)\n",
vf->id, *handle, *va, size);
return 0;
}
ret = gsp_rpc_send_sync(vf->gsp->rpc, GSP_RPC_ALLOC,
&payload, sizeof(payload),
&resp, &resp_size);
if (ret)
return ret;
*handle = resp.handle;
*va = resp.va;
dev_dbg(vf->gsp->dev, "VF %u: alloc handle=0x%llx va=0x%llx size=0x%llx\n",
vf->id, *handle, *va, size);
return 0;
}
int gsp_vf_mem_free(struct gsp_vf *vf, uint64_t handle)
{
/* FREE uses primary dispatcher sub-command */
struct gsp_subcmd_desc desc;
size_t desc_size = sizeof(desc);
int ret;
/* Subcmd for FREE: need to determine which subcmd corresponds to FREE */
/* For now, use a generic FREE RPC if implemented */
/* Placeholder - actual implementation depends on FREE subcmd mapping */
dev_dbg(vf->gsp->dev, "VF %u: free handle=0x%llx\n", vf->id, handle);
return 0;
}
/* Memory Pinning */
int gsp_vf_mem_pin(struct gsp_vf *vf, uint64_t handle,
uint64_t offset, uint64_t size,
uint64_t *dma_addr)
{
struct gsp_pin_payload payload = {
.handle = handle,
.offset = offset,
.size = size,
.vf_id = vf->id,
.flags = GSP_PIN_READ | GSP_PIN_WRITE,
};
struct gsp_pin_response resp;
size_t resp_size = sizeof(resp);
int ret;
if (!dma_addr)
return -EINVAL;
/* In emulation mode, handle locally */
if (emulation_mode) {
static uint64_t next_dma = 0x200000000ULL; /* 8GB base */
*dma_addr = next_dma;
next_dma += (size + 0xFFF) & ~0xFFF;
dev_dbg(vf->gsp->dev, "VF %u: pin handle=0x%llx offset=0x%llx size=0x%llx -> dma=0x%llx (emulation)\n",
vf->id, handle, offset, size, *dma_addr);
return 0;
}
ret = gsp_rpc_send_sync(vf->gsp->rpc, GSP_RPC_PIN,
&payload, sizeof(payload),
&resp, &resp_size);
if (ret)
return ret;
*dma_addr = resp.dma_addr;
dev_dbg(vf->gsp->dev, "VF %u: pin handle=0x%llx offset=0x%llx size=0x%llx -> dma=0x%llx\n",
vf->id, handle, offset, size, *dma_addr);
return 0;
}
int gsp_vf_mem_unpin(struct gsp_vf *vf, uint64_t handle)
{
dev_dbg(vf->gsp->dev, "VF %u: unpin handle=0x%llx\n", vf->id, handle);
return 0;
}
/* Memory Mapping */
int gsp_vf_mem_map(struct gsp_vf *vf, uint64_t handle, uint64_t gpu_va,
uint64_t size, uint32_t prot, uint32_t flags,
uint64_t offset, uint64_t *mapped_va)
{
/* In emulation mode, just return the requested VA */
if (emulation_mode) {
if (mapped_va)
*mapped_va = gpu_va;
dev_dbg(vf->gsp->dev, "VF %u: map handle=0x%llx gpu_va=0x%llx size=0x%llx -> mapped_va=0x%llx (emulation)\n",
vf->id, handle, gpu_va, size, gpu_va);
return 0;
}
/* TODO: Implement GSP RPC for MAP */
dev_dbg(vf->gsp->dev, "VF %u: map handle=0x%llx gpu_va=0x%llx size=0x%llx\n",
vf->id, handle, gpu_va, size);
if (mapped_va)
*mapped_va = gpu_va;
return 0;
}
int gsp_vf_mem_unmap(struct gsp_vf *vf, uint64_t handle, uint64_t gpu_va, uint64_t size)
{
dev_dbg(vf->gsp->dev, "VF %u: unmap handle=0x%llx gpu_va=0x%llx size=0x%llx\n",
vf->id, handle, gpu_va, size);
return 0;
}
/* Scheduling */
int gsp_vf_schedule(struct gsp_vf *vf, uint32_t priority, uint64_t time_slice_ns)
{
/* Use primary dispatcher SCHEDULE subcmd or secondary dispatcher */
dev_dbg(vf->gsp->dev, "VF %u: schedule prio=%u slice=%llu ns\n",
vf->id, priority, time_slice_ns);
return 0;
}
int gsp_vf_yield(struct gsp_vf *vf)
{
dev_dbg(vf->gsp->dev, "VF %u: yield\n", vf->id);
return 0;
}
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