// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2023 Advanced Micro Devices, Inc */
#include <linux/errno.h>
#include <linux/pci.h>
#include <linux/utsname.h>
#include "core.h"
int pdsc_err_to_errno(enum pds_core_status_code code)
{
switch (code) {
case PDS_RC_SUCCESS:
return 0;
case PDS_RC_EVERSION:
case PDS_RC_EQTYPE:
case PDS_RC_EQID:
case PDS_RC_EINVAL:
case PDS_RC_ENOSUPP:
return -EINVAL;
case PDS_RC_EPERM:
return -EPERM;
case PDS_RC_ENOENT:
return -ENOENT;
case PDS_RC_EAGAIN:
return -EAGAIN;
case PDS_RC_ENOMEM:
return -ENOMEM;
case PDS_RC_EFAULT:
return -EFAULT;
case PDS_RC_EBUSY:
return -EBUSY;
case PDS_RC_EEXIST:
return -EEXIST;
case PDS_RC_EVFID:
return -ENODEV;
case PDS_RC_ECLIENT:
return -ECHILD;
case PDS_RC_ENOSPC:
return -ENOSPC;
case PDS_RC_ERANGE:
return -ERANGE;
case PDS_RC_BAD_ADDR:
return -EFAULT;
case PDS_RC_BAD_PCI:
return -ENXIO;
case PDS_RC_EOPCODE:
case PDS_RC_EINTR:
case PDS_RC_DEV_CMD:
case PDS_RC_ERROR:
case PDS_RC_ERDMA:
case PDS_RC_EIO:
default:
return -EIO;
}
}
bool pdsc_is_fw_running(struct pdsc *pdsc)
{
if (!pdsc->info_regs)
return false;
pdsc->fw_status = ioread8(&pdsc->info_regs->fw_status);
pdsc->last_fw_time = jiffies;
pdsc->last_hb = ioread32(&pdsc->info_regs->fw_heartbeat);
/* Firmware is useful only if the running bit is set and
* fw_status != 0xff (bad PCI read)
*/
return (pdsc->fw_status != PDS_RC_BAD_PCI) &&
(pdsc->fw_status & PDS_CORE_FW_STS_F_RUNNING);
}
bool pdsc_is_fw_good(struct pdsc *pdsc)
{
bool fw_running = pdsc_is_fw_running(pdsc);
u8 gen;
/* Make sure to update the cached fw_status by calling
* pdsc_is_fw_running() before getting the generation
*/
gen = pdsc->fw_status & PDS_CORE_FW_STS_F_GENERATION;
return fw_running && gen == pdsc->fw_generation;
}
static u8 pdsc_devcmd_status(struct pdsc *pdsc)
{
return ioread8(&pdsc->cmd_regs->comp.status);
}
static bool pdsc_devcmd_done(struct pdsc *pdsc)
{
return ioread32(&pdsc->cmd_regs->done) & PDS_CORE_DEV_CMD_DONE;
}
static void pdsc_devcmd_dbell(struct pdsc *pdsc)
{
iowrite32(0, &pdsc->cmd_regs->done);
iowrite32(1, &pdsc->cmd_regs->doorbell);
}
static void pdsc_devcmd_clean(struct pdsc *pdsc)
{
iowrite32(0, &pdsc->cmd_regs->doorbell);
memset_io(&pdsc->cmd_regs->cmd, 0, sizeof(pdsc->cmd_regs->cmd));
}
static const char *pdsc_devcmd_str(int opcode)
{
switch (opcode) {
case PDS_CORE_CMD_NOP:
return "PDS_CORE_CMD_NOP";
case PDS_CORE_CMD_IDENTIFY:
return "PDS_CORE_CMD_IDENTIFY";
case PDS_CORE_CMD_RESET:
return "PDS_CORE_CMD_RESET";
case PDS_CORE_CMD_INIT:
return "PDS_CORE_CMD_INIT";
case PDS_CORE_CMD_FW_DOWNLOAD:
return "PDS_CORE_CMD_FW_DOWNLOAD";
case PDS_CORE_CMD_FW_CONTROL:
return "PDS_CORE_CMD_FW_CONTROL";
default:
return "PDS_CORE_CMD_UNKNOWN";
}
}
static int pdsc_devcmd_wait(struct pdsc *pdsc, u8 opcode, int max_seconds)
{
struct device *dev = pdsc->dev;
unsigned long start_time;
unsigned long max_wait;
unsigned long duration;
int timeout = 0;
bool running;
int done = 0;
int err = 0;
int status;
start_time = jiffies;
max_wait = start_time + (max_seconds * HZ);
while (!done && !timeout) {
running = pdsc_is_fw_running(pdsc);
if (!running)
break;
done = pdsc_devcmd_done(pdsc);
if (done)
break;
timeout = time_after(jiffies, max_wait);
if (timeout)
break;
usleep_range(100, 200);
}
duration = jiffies - start_time;
if (done && duration > HZ)
dev_dbg(dev, "DEVCMD %d %s after %ld secs\n",
opcode, pdsc_devcmd_str(opcode), duration / HZ);
if ((!done || timeout) && running) {
dev_err(dev, "DEVCMD %d %s timeout, done %d timeout %d max_seconds=%d\n",
opcode, pdsc_devcmd_str(opcode), done, timeout,
max_seconds);
err = -ETIMEDOUT;
pdsc_devcmd_clean(pdsc);
}
status = pdsc_devcmd_status(pdsc);
err = pdsc_err_to_errno(status);
if (err && err != -EAGAIN)
dev_err(dev, "DEVCMD %d %s failed, status=%d err %d %pe\n",
opcode, pdsc_devcmd_str(opcode), status, err,
ERR_PTR(err));
return err;
}
int pdsc_devcmd_locked(struct pdsc *pdsc, union pds_core_dev_cmd *cmd,
union pds_core_dev_comp *comp, int max_seconds)
{
int err;
if (!pdsc->cmd_regs)
return -ENXIO;
memcpy_toio(&pdsc->cmd_regs->cmd, cmd, sizeof(*cmd));
pdsc_devcmd_dbell(pdsc);
err = pdsc_devcmd_wait(pdsc, cmd->opcode, max_seconds);
if ((err == -ENXIO || err == -ETIMEDOUT) && pdsc->wq)
queue_work(pdsc->wq, &pdsc->health_work);
else
memcpy_fromio(comp, &pdsc->cmd_regs->comp, sizeof(*comp));
return err;
}
int pdsc_devcmd(struct pdsc *pdsc, union pds_core_dev_cmd *cmd,
union pds_core_dev_comp *comp, int max_seconds)
{
int err;
mutex_lock(&pdsc->devcmd_lock);
err = pdsc_devcmd_locked(pdsc, cmd, comp, max_seconds);
mutex_unlock(&pdsc->devcmd_lock);
return err;
}
int pdsc_devcmd_init(struct pdsc *pdsc)
{
union pds_core_dev_comp comp = {};
union pds_core_dev_cmd cmd = {
.opcode = PDS_CORE_CMD_INIT,
};
return pdsc_devcmd(pdsc, &cmd, &comp, pdsc->devcmd_timeout);
}
int pdsc_devcmd_reset(struct pdsc *pdsc)
{
union pds_core_dev_comp comp = {};
union pds_core_dev_cmd cmd = {
.reset.opcode = PDS_CORE_CMD_RESET,
};
if (!pdsc_is_fw_running(pdsc))
return 0;
return pdsc_devcmd(pdsc, &cmd, &comp, pdsc->devcmd_timeout);
}
static int pdsc_devcmd_identify_locked(struct pdsc *pdsc)
{
union pds_core_dev_comp comp = {};
union pds_core_dev_cmd cmd = {
.identify.opcode = PDS_CORE_CMD_IDENTIFY,
.identify.ver = PDS_CORE_IDENTITY_VERSION_1,
};
return pdsc_devcmd_locked(pdsc, &cmd, &comp, pdsc->devcmd_timeout);
}
static void pdsc_init_devinfo(struct pdsc *pdsc)
{
pdsc->dev_info.asic_type = ioread8(&pdsc->info_regs->asic_type);
pdsc->dev_info.asic_rev = ioread8(&pdsc->info_regs->asic_rev);
pdsc->fw_generation = PDS_CORE_FW_STS_F_GENERATION &
ioread8(&pdsc->info_regs->fw_status);
memcpy_fromio(pdsc->dev_info.fw_version,
pdsc->info_regs->fw_version,
PDS_CORE_DEVINFO_FWVERS_BUFLEN);
pdsc->dev_info.fw_version[PDS_CORE_DEVINFO_FWVERS_BUFLEN] = 0;
memcpy_fromio(pdsc->dev_info.serial_num,
pdsc->info_regs->serial_num,
PDS_CORE_DEVINFO_SERIAL_BUFLEN);
pdsc->dev_info.serial_num[PDS_CORE_DEVINFO_SERIAL_BUFLEN] = 0;
dev_dbg(pdsc->dev, "fw_version %s\n", pdsc->dev_info.fw_version);
}
static int pdsc_identify(struct pdsc *pdsc)
{
struct pds_core_drv_identity drv = {};
size_t sz;
int err;
int n;
drv.drv_type = cpu_to_le32(PDS_DRIVER_LINUX);
/* Catching the return quiets a Wformat-truncation complaint */
n = snprintf(drv.driver_ver_str, sizeof(drv.driver_ver_str),
"%s %s", PDS_CORE_DRV_NAME, utsname()->release);
if (n > sizeof(drv.driver_ver_str))
dev_dbg(pdsc->dev, "release name truncated, don't care\n");
/* Next let's get some info about the device
* We use the devcmd_lock at this level in order to
* get safe access to the cmd_regs->data before anyone
* else can mess it up
*/
mutex_lock(&pdsc->devcmd_lock);
sz = min_t(size_t, sizeof(drv), sizeof(pdsc->cmd_regs->data));
memcpy_toio(&pdsc->cmd_regs->data, &drv, sz);
err = pdsc_devcmd_identify_locked(pdsc);
if (!err) {
sz = min_t(size_t, sizeof(pdsc->dev_ident),
sizeof(pdsc->cmd_regs->data));
memcpy_fromio(&pdsc->dev_ident, &pdsc->cmd_regs->data, sz);
}
mutex_unlock(&pdsc->devcmd_lock);
if (err) {
dev_err(pdsc->dev, "Cannot identify device: %pe\n",
ERR_PTR(err));
return err;
}
if (isprint(pdsc->dev_info.fw_version[0]) &&
isascii(pdsc->dev_info.fw_version[0]))
dev_info(pdsc->dev, "FW: %.*s\n",
(int)(sizeof(pdsc->dev_info.fw_version) - 1),
pdsc->dev_info.fw_version);
else
dev_info(pdsc->dev, "FW: (invalid string) 0x%02x 0x%02x 0x%02x 0x%02x ...\n",
(u8)pdsc->dev_info.fw_version[0],
(u8)pdsc->dev_info.fw_version[1],
(u8)pdsc->dev_info.fw_version[2],
(u8)pdsc->dev_info.fw_version[3]);
return 0;
}
void pdsc_dev_uninit(struct pdsc *pdsc)
{
if (pdsc->intr_info) {
int i;
for (i = 0; i < pdsc->nintrs; i++)
pdsc_intr_free(pdsc, i);
kfree(pdsc->intr_info);
pdsc->intr_info = NULL;
pdsc->nintrs = 0;
}
pci_free_irq_vectors(pdsc->pdev);
}
int pdsc_dev_init(struct pdsc *pdsc)
{
unsigned int nintrs;
int err;
/* Initial init and reset of device */
pdsc_init_devinfo(pdsc);
pdsc->devcmd_timeout = PDS_CORE_DEVCMD_TIMEOUT;
err = pdsc_devcmd_reset(pdsc);
if (err)
return err;
err = pdsc_identify(pdsc);
if (err)
return err;
pdsc_debugfs_add_ident(pdsc);
/* Now we can reserve interrupts */
nintrs = le32_to_cpu(pdsc->dev_ident.nintrs);
nintrs = min_t(unsigned int, num_online_cpus(), nintrs);
/* Get intr_info struct array for tracking */
pdsc->intr_info = kcalloc(nintrs, sizeof(*pdsc->intr_info), GFP_KERNEL);
if (!pdsc->intr_info)
return -ENOMEM;
err = pci_alloc_irq_vectors(pdsc->pdev, nintrs, nintrs, PCI_IRQ_MSIX);
if (err != nintrs) {
dev_err(pdsc->dev, "Can't get %d intrs from OS: %pe\n",
nintrs, ERR_PTR(err));
err = -ENOSPC;
goto err_out;
}
pdsc->nintrs = nintrs;
return 0;
err_out:
kfree(pdsc->intr_info);
pdsc->intr_info = NULL;
return err;
}
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