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// SPDX-License-Identifier: GPL-2.0
/*
* GXP virtual device manager.
*
* Copyright (C) 2021 Google LLC
*/
#include <linux/bitops.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/types.h>
#include "gxp-dma.h"
#include "gxp-firmware.h"
#include "gxp-firmware-data.h"
#include "gxp-internal.h"
#include "gxp-vd.h"
int gxp_vd_init(struct gxp_dev *gxp)
{
uint core;
int ret;
mutex_init(&gxp->vd_lock);
mutex_lock(&gxp->vd_lock);
/* Mark all cores as free */
for (core = 0; core < GXP_NUM_CORES; core++)
gxp->core_to_client[core] = NULL;
ret = gxp_fw_init(gxp);
mutex_unlock(&gxp->vd_lock);
return ret;
}
void gxp_vd_destroy(struct gxp_dev *gxp)
{
mutex_lock(&gxp->vd_lock);
gxp_fw_destroy(gxp);
mutex_unlock(&gxp->vd_lock);
}
/* Caller must hold gxp->vd_lock */
static void gxp_vd_release(struct gxp_client *client)
{
uint core;
struct gxp_dev *gxp = client->gxp;
for (core = 0; core < GXP_NUM_CORES; core++) {
if (gxp->core_to_client[core] == client) {
gxp->core_to_client[core] = NULL;
gxp_firmware_stop(gxp, core);
}
}
if (client->app) {
gxp_fw_data_destroy_app(gxp, client->app);
client->app = NULL;
}
}
/* Caller must hold gxp->vd_lock */
int gxp_vd_allocate(struct gxp_client *client, u16 requested_cores)
{
struct gxp_dev *gxp = client->gxp;
uint core;
int available_cores = 0;
int cores_remaining = requested_cores;
uint core_list = 0;
int ret = 0;
/* Assumes 0 < requested_cores <= GXP_NUM_CORES */
WARN_ON(requested_cores == 0 || requested_cores > GXP_NUM_CORES);
/* Assumes client has not called gxp_vd_allocate */
WARN_ON(client->vd_allocated);
for (core = 0; core < GXP_NUM_CORES; core++) {
if (gxp->core_to_client[core] == NULL) {
if (available_cores < requested_cores)
core_list |= BIT(core);
available_cores++;
}
}
if (available_cores < requested_cores) {
dev_err(gxp->dev, "Insufficient available cores. Available: %d. Requested: %u\n",
available_cores, requested_cores);
return -EBUSY;
}
client->app = gxp_fw_data_create_app(gxp, core_list);
for (core = 0; core < GXP_NUM_CORES; core++) {
if (cores_remaining == 0)
break;
if (core_list & BIT(core)) {
ret = gxp_firmware_run(gxp, core);
if (ret) {
dev_err(gxp->dev, "Failed to run firmware on core %u\n",
core);
goto out_vd_release;
}
gxp->core_to_client[core] = client;
cores_remaining--;
}
}
if (cores_remaining != 0) {
dev_err(gxp->dev, "Internal error: Failed to allocate %u requested cores. %d cores remaining\n",
requested_cores, cores_remaining);
/*
* Should never reach here. Previously verified that enough
* cores are available.
*/
WARN_ON(true);
ret = -EIO;
goto out_vd_release;
}
client->vd_allocated = true;
return ret;
out_vd_release:
gxp_vd_release(client);
return ret;
}
int gxp_vd_virt_core_to_phys_core(struct gxp_client *client, u16 virt_core)
{
struct gxp_dev *gxp = client->gxp;
uint phys_core;
uint virt_core_index = 0;
mutex_lock(&gxp->vd_lock);
if (!client->vd_allocated) {
mutex_unlock(&gxp->vd_lock);
dev_dbg(gxp->dev, "Client has not allocated a virtual device\n");
return -EINVAL;
}
for (phys_core = 0; phys_core < GXP_NUM_CORES; phys_core++) {
if (gxp->core_to_client[phys_core] == client) {
if (virt_core_index == virt_core) {
/* Found virtual core */
mutex_unlock(&gxp->vd_lock);
return phys_core;
}
virt_core_index++;
}
}
mutex_unlock(&gxp->vd_lock);
dev_dbg(gxp->dev, "No mapping for virtual core %u\n", virt_core);
return -EINVAL;
}
uint gxp_vd_virt_core_list_to_phys_core_list(struct gxp_client *client,
u16 virt_core_list)
{
uint phys_core_list = 0;
uint virt_core = 0;
int phys_core;
while (virt_core_list) {
/*
* Get the next virt core by finding the index of the first
* set bit in the core list.
*
* Subtract 1 since `ffs()` returns a 1-based index. Since
* virt_core_list cannot be 0 at this point, no need to worry
* about wrap-around.
*/
virt_core = ffs(virt_core_list) - 1;
/* Any invalid virt cores invalidate the whole list */
phys_core = gxp_vd_virt_core_to_phys_core(client, virt_core);
if (phys_core < 0)
return 0;
phys_core_list |= BIT(phys_core);
virt_core_list &= ~BIT(virt_core);
}
return phys_core_list;
}
struct gxp_client *gxp_client_create(struct gxp_dev *gxp)
{
struct gxp_client *client;
client = kmalloc(sizeof(*client), GFP_KERNEL);
if (!client)
return ERR_PTR(-ENOMEM);
client->gxp = gxp;
client->vd_allocated = false;
client->app = NULL;
client->tpu_mbx_allocated = false;
return client;
}
void gxp_client_destroy(struct gxp_client *client)
{
struct gxp_dev *gxp = client->gxp;
mutex_lock(&gxp->vd_lock);
#ifdef CONFIG_ANDROID
/*
* Unmap TPU buffers, if the mapping is already removed, this
* is a no-op.
*/
gxp_dma_unmap_tpu_buffer(gxp, client->mbx_desc);
#endif // CONFIG_ANDROID
gxp_vd_release(client);
mutex_unlock(&gxp->vd_lock);
kfree(client);
}
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