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/*-
* BSD LICENSE
*
* Copyright (c) Intel Corporation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "spdk/stdinc.h"
#include "spdk/likely.h"
#include "spdk/log.h"
#include "vmd.h"
struct vmd_led_indicator_config {
uint8_t attention_indicator : 2;
uint8_t power_indicator : 2;
uint8_t reserved : 4;
};
/*
* VMD LED Attn Power LED Amber
* State Indicator Indicator
* Control Control
* ------------------------------------------------
* Off 11b 11b Off
* Ident 11b 01b Blink 4Hz
* Fault 01b 11b On
* Rebuild 01b 01b Blink 1Hz
*/
static const struct vmd_led_indicator_config g_led_config[] = {
[SPDK_VMD_LED_STATE_OFF] = { .attention_indicator = 3, .power_indicator = 3 },
[SPDK_VMD_LED_STATE_IDENTIFY] = { .attention_indicator = 3, .power_indicator = 1 },
[SPDK_VMD_LED_STATE_FAULT] = { .attention_indicator = 1, .power_indicator = 3 },
[SPDK_VMD_LED_STATE_REBUILD] = { .attention_indicator = 1, .power_indicator = 1 },
};
static void
vmd_led_set_indicator_control(struct vmd_pci_device *vmd_device, enum spdk_vmd_led_state state)
{
const struct vmd_led_indicator_config *config;
union express_slot_control_register slot_control;
assert(state >= SPDK_VMD_LED_STATE_OFF && state <= SPDK_VMD_LED_STATE_REBUILD);
config = &g_led_config[state];
slot_control = vmd_device->pcie_cap->slot_control;
slot_control.bit_field.attention_indicator_control = config->attention_indicator;
slot_control.bit_field.power_indicator_control = config->power_indicator;
/*
* Due to the fact that writes to the PCI config space are posted writes, we need to issue
* a read to the register we've just written to ensure it reached its destination.
* TODO: wrap all register writes with a function taking care of that.
*/
vmd_device->pcie_cap->slot_control = slot_control;
vmd_device->cached_slot_control = vmd_device->pcie_cap->slot_control;
}
static unsigned int
vmd_led_get_state(struct vmd_pci_device *vmd_device)
{
const struct vmd_led_indicator_config *config;
union express_slot_control_register slot_control;
unsigned int state;
slot_control = vmd_device->cached_slot_control;
for (state = SPDK_VMD_LED_STATE_OFF; state <= SPDK_VMD_LED_STATE_REBUILD; ++state) {
config = &g_led_config[state];
if (slot_control.bit_field.attention_indicator_control == config->attention_indicator &&
slot_control.bit_field.power_indicator_control == config->power_indicator) {
return state;
}
}
return SPDK_VMD_LED_STATE_UNKNOWN;
}
/*
* The identifying device under VMD is located in the global list of VMD controllers. If the BDF
* identifies an endpoint, then the LED is attached to the endpoint's parent. If the BDF identifies
* a type 1 header, then this device has the corresponding LED. This may arise when a user wants to
* identify a given empty slot under VMD.
*/
static struct vmd_pci_device *
vmd_get_led_device(const struct spdk_pci_device *pci_device)
{
struct vmd_pci_device *vmd_device;
assert(strcmp(spdk_pci_device_get_type(pci_device), "vmd") == 0);
vmd_device = vmd_find_device(&pci_device->addr);
if (spdk_unlikely(vmd_device == NULL)) {
return NULL;
}
if (vmd_device->header_type == PCI_HEADER_TYPE_NORMAL) {
if (spdk_unlikely(vmd_device->parent == NULL)) {
return NULL;
}
return vmd_device->parent->self;
}
return vmd_device;
}
int
spdk_vmd_set_led_state(struct spdk_pci_device *pci_device, enum spdk_vmd_led_state state)
{
struct vmd_pci_device *vmd_device;
if (state < SPDK_VMD_LED_STATE_OFF || state > SPDK_VMD_LED_STATE_REBUILD) {
SPDK_ERRLOG("Invalid LED state\n");
return -EINVAL;
}
vmd_device = vmd_get_led_device(pci_device);
if (spdk_unlikely(vmd_device == NULL)) {
SPDK_ERRLOG("The PCI device is not behind the VMD\n");
return -ENODEV;
}
vmd_led_set_indicator_control(vmd_device, state);
return 0;
}
int
spdk_vmd_get_led_state(struct spdk_pci_device *pci_device, enum spdk_vmd_led_state *state)
{
struct vmd_pci_device *vmd_device;
vmd_device = vmd_get_led_device(pci_device);
if (spdk_unlikely(vmd_device == NULL)) {
SPDK_ERRLOG("The PCI device is not behind the VMD\n");
return -ENODEV;
}
*state = (enum spdk_vmd_led_state)vmd_led_get_state(vmd_device);
return 0;
}
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