// SPDX-License-Identifier: GPL-2.0+
// Copyright 2017 IBM Corp.
#include <linux/pci.h>
#include <asm/pnv-ocxl.h>
#include <misc/ocxl-config.h>
#include "ocxl_internal.h"
#define EXTRACT_BIT(val, bit) (!!(val & BIT(bit)))
#define EXTRACT_BITS(val, s, e) ((val & GENMASK(e, s)) >> s)
#define OCXL_DVSEC_AFU_IDX_MASK GENMASK(5, 0)
#define OCXL_DVSEC_ACTAG_MASK GENMASK(11, 0)
#define OCXL_DVSEC_PASID_MASK GENMASK(19, 0)
#define OCXL_DVSEC_PASID_LOG_MASK GENMASK(4, 0)
#define OCXL_DVSEC_TEMPL_VERSION 0x0
#define OCXL_DVSEC_TEMPL_NAME 0x4
#define OCXL_DVSEC_TEMPL_AFU_VERSION 0x1C
#define OCXL_DVSEC_TEMPL_MMIO_GLOBAL 0x20
#define OCXL_DVSEC_TEMPL_MMIO_GLOBAL_SZ 0x28
#define OCXL_DVSEC_TEMPL_MMIO_PP 0x30
#define OCXL_DVSEC_TEMPL_MMIO_PP_SZ 0x38
#define OCXL_DVSEC_TEMPL_ALL_MEM_SZ 0x3C
#define OCXL_DVSEC_TEMPL_LPC_MEM_START 0x40
#define OCXL_DVSEC_TEMPL_WWID 0x48
#define OCXL_DVSEC_TEMPL_LPC_MEM_SZ 0x58
#define OCXL_MAX_AFU_PER_FUNCTION 64
#define OCXL_TEMPL_LEN_1_0 0x58
#define OCXL_TEMPL_LEN_1_1 0x60
#define OCXL_TEMPL_NAME_LEN 24
#define OCXL_CFG_TIMEOUT 3
static int find_dvsec(struct pci_dev *dev, int dvsec_id)
{
return pci_find_dvsec_capability(dev, PCI_VENDOR_ID_IBM, dvsec_id);
}
static int find_dvsec_afu_ctrl(struct pci_dev *dev, u8 afu_idx)
{
int vsec = 0;
u16 vendor, id;
u8 idx;
while ((vsec = pci_find_next_ext_capability(dev, vsec,
OCXL_EXT_CAP_ID_DVSEC))) {
pci_read_config_word(dev, vsec + OCXL_DVSEC_VENDOR_OFFSET,
&vendor);
pci_read_config_word(dev, vsec + OCXL_DVSEC_ID_OFFSET, &id);
if (vendor == PCI_VENDOR_ID_IBM &&
id == OCXL_DVSEC_AFU_CTRL_ID) {
pci_read_config_byte(dev,
vsec + OCXL_DVSEC_AFU_CTRL_AFU_IDX,
&idx);
if (idx == afu_idx)
return vsec;
}
}
return 0;
}
/**
* get_function_0() - Find a related PCI device (function 0)
* @dev: PCI device to match
*
* Returns a pointer to the related device, or null if not found
*/
static struct pci_dev *get_function_0(struct pci_dev *dev)
{
unsigned int devfn = PCI_DEVFN(PCI_SLOT(dev->devfn), 0);
return pci_get_domain_bus_and_slot(pci_domain_nr(dev->bus),
dev->bus->number, devfn);
}
static void read_pasid(struct pci_dev *dev, struct ocxl_fn_config *fn)
{
u16 val;
int pos;
pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_PASID);
if (!pos) {
/*
* PASID capability is not mandatory, but there
* shouldn't be any AFU
*/
dev_dbg(&dev->dev, "Function doesn't require any PASID\n");
fn->max_pasid_log = -1;
goto out;
}
pci_read_config_word(dev, pos + PCI_PASID_CAP, &val);
fn->max_pasid_log = EXTRACT_BITS(val, 8, 12);
out:
dev_dbg(&dev->dev, "PASID capability:\n");
dev_dbg(&dev->dev, " Max PASID log = %d\n", fn->max_pasid_log);
}
static int read_dvsec_tl(struct pci_dev *dev, struct ocxl_fn_config *fn)
{
int pos;
pos = find_dvsec(dev, OCXL_DVSEC_TL_ID);
if (!pos && PCI_FUNC(dev->devfn) == 0) {
dev_err(&dev->dev, "Can't find TL DVSEC\n");
return -ENODEV;
}
if (pos && PCI_FUNC(dev->devfn) != 0) {
dev_err(&dev->dev, "TL DVSEC is only allowed on function 0\n");
return -ENODEV;
}
fn->dvsec_tl_pos = pos;
return 0;
}
static int read_dvsec_function(struct pci_dev *dev, struct ocxl_fn_config *fn)
{
int pos, afu_present;
u32 val;
pos = find_dvsec(dev, OCXL_DVSEC_FUNC_ID);
if (!pos) {
dev_err(&dev->dev, "Can't find function DVSEC\n");
return -ENODEV;
}
fn->dvsec_function_pos = pos;
pci_read_config_dword(dev, pos + OCXL_DVSEC_FUNC_OFF_INDEX, &val);
afu_present = EXTRACT_BIT(val, 31);
if (!afu_present) {
fn->max_afu_index = -1;
dev_dbg(&dev->dev, "Function doesn't define any AFU\n");
goto out;
}
fn->max_afu_index = EXTRACT_BITS(val, 24, 29);
out:
dev_dbg(&dev->dev, "Function DVSEC:\n");
dev_dbg(&dev->dev, " Max AFU index = %d\n", fn->max_afu_index);
return 0;
}
static int read_dvsec_afu_info(struct pci_dev *dev, struct ocxl_fn_config *fn)
{
int pos;
if (fn->max_afu_index < 0) {
fn->dvsec_afu_info_pos = -1;
return 0;
}
pos = find_dvsec(dev, OCXL_DVSEC_AFU_INFO_ID);
if (!pos) {
dev_err(&dev->dev, "Can't find AFU information DVSEC\n");
return -ENODEV;
}
fn->dvsec_afu_info_pos = pos;
return 0;
}
static int read_dvsec_vendor(struct pci_dev *dev)
{
int pos;
u32 cfg, tlx, dlx, reset_reload;
/*
* vendor specific DVSEC, for IBM images only. Some older
* images may not have it
*
* It's only used on function 0 to specify the version of some
* logic blocks and to give access to special registers to
* enable host-based flashing.
*/
if (PCI_FUNC(dev->devfn) != 0)
return 0;
pos = find_dvsec(dev, OCXL_DVSEC_VENDOR_ID);
if (!pos)
return 0;
pci_read_config_dword(dev, pos + OCXL_DVSEC_VENDOR_CFG_VERS, &cfg);
pci_read_config_dword(dev, pos + OCXL_DVSEC_VENDOR_TLX_VERS, &tlx);
pci_read_config_dword(dev, pos + OCXL_DVSEC_VENDOR_DLX_VERS, &dlx);
pci_read_config_dword(dev, pos + OCXL_DVSEC_VENDOR_RESET_RELOAD,
&reset_reload);
dev_dbg(&dev->dev, "Vendor specific DVSEC:\n");
dev_dbg(&dev->dev, " CFG version = 0x%x\n", cfg);
dev_dbg(&dev->dev, " TLX version = 0x%x\n", tlx);
dev_dbg(&dev->dev, " DLX version = 0x%x\n", dlx);
dev_dbg(&dev->dev, " ResetReload = 0x%x\n", reset_reload);
return 0;
}
/**
* get_dvsec_vendor0() - Find a related PCI device (function 0)
* @dev: PCI device to match
* @dev0: The PCI device (function 0) found
* @out_pos: The position of PCI device (function 0)
*
* Returns 0 on success, negative on failure.
*
* NOTE: If it's successful, the reference of dev0 is increased,
* so after using it, the callers must call pci_dev_put() to give
* up the reference.
*/
static int get_dvsec_vendor0(struct pci_dev *dev, struct pci_dev **dev0,
int *out_pos)
{
int pos;
if (PCI_FUNC(dev->devfn) != 0) {
dev = get_function_0(dev);
if (!dev)
return -1;
} else {
dev = pci_dev_get(dev);
}
pos = find_dvsec(dev, OCXL_DVSEC_VENDOR_ID);
if (!pos) {
pci_dev_put(dev);
return -1;
}
*dev0 = dev;
*out_pos = pos;
return 0;
}
int ocxl_config_get_reset_reload(struct pci_dev *dev, int *val)
{
struct pci_dev *dev0;
u32 reset_reload;
int pos;
if (get_dvsec_vendor0(dev, &dev0, &pos))
return -1;
pci_read_config_dword(dev0, pos + OCXL_DVSEC_VENDOR_RESET_RELOAD,
&reset_reload);
pci_dev_put(dev0);
*val = !!(reset_reload & BIT(0));
return 0;
}
int ocxl_config_set_reset_reload(struct pci_dev *dev, int val)
{
struct pci_dev *dev0;
u32 reset_reload;
int pos;
if (get_dvsec_vendor0(dev, &dev0, &pos))
return -1;
pci_read_config_dword(dev0, pos + OCXL_DVSEC_VENDOR_RESET_RELOAD,
&reset_reload);
if (val)
reset_reload |= BIT(0);
else
reset_reload &= ~BIT(0);
pci_write_config_dword(dev0, pos + OCXL_DVSEC_VENDOR_RESET_RELOAD,
reset_reload);
pci_dev_put(dev0);
return 0;
}
static int validate_function(struct pci_dev *dev, struct ocxl_fn_config *fn)
{
if (fn->max_pasid_log == -1 && fn->max_afu_index >= 0) {
dev_err(&dev->dev,
"AFUs are defined but no PASIDs are requested\n");
return -EINVAL;
}
if (fn->max_afu_index > OCXL_MAX_AFU_PER_FUNCTION) {
dev_err(&dev->dev,
"Max AFU index out of architectural limit (%d vs %d)\n",
fn->max_afu_index, OCXL_MAX_AFU_PER_FUNCTION);
return -EINVAL;
}
return 0;
}
int ocxl_config_read_function(struct pci_dev *dev, struct ocxl_fn_config *fn)
{
int rc;
read_pasid(dev, fn);
rc = read_dvsec_tl(dev, fn);
if (rc) {
dev_err(&dev->dev,
"Invalid Transaction Layer DVSEC configuration: %d\n",
rc);
return -ENODEV;
}
rc = read_dvsec_function(dev, fn);
if (rc) {
dev_err(&dev->dev,
"Invalid Function DVSEC configuration: %d\n", rc);
return -ENODEV;
}
rc = read_dvsec_afu_info(dev, fn);
if (rc) {
dev_err(&dev->dev, "Invalid AFU configuration: %d\n", rc);
return -ENODEV;
}
rc = read_dvsec_vendor(dev);
if (rc) {
dev_err(&dev->dev,
"Invalid vendor specific DVSEC configuration: %d\n",
rc);
return -ENODEV;
}
rc = validate_function(dev, fn);
return rc;
}
EXPORT_SYMBOL_GPL(ocxl_config_read_function);
static int read_afu_info(struct pci_dev *dev, struct ocxl_fn_config *fn,
int offset, u32 *data)
{
u32 val;
unsigned long timeout = jiffies + (HZ * OCXL_CFG_TIMEOUT);
int pos = fn->dvsec_afu_info_pos;
/* Protect 'data valid' bit */
if (EXTRACT_BIT(offset, 31)) {
dev_err(&dev->dev, "Invalid offset in AFU info DVSEC\n");
return -EINVAL;
}
pci_write_config_dword(dev, pos + OCXL_DVSEC_AFU_INFO_OFF, offset);
pci_read_config_dword(dev, pos + OCXL_DVSEC_AFU_INFO_OFF, &val);
while (!EXTRACT_BIT(val, 31)) {
if (time_after_eq(jiffies, timeout)) {
dev_err(&dev->dev,
"Timeout while reading AFU info DVSEC (offset=%d)\n",
offset);
return -EBUSY;
}
cpu_relax();
pci_read_config_dword(dev, pos + OCXL_DVSEC_AFU_INFO_OFF, &val);
}
pci_read_config_dword(dev, pos + OCXL_DVSEC_AFU_INFO_DATA, data);
return 0;
}
/**
* read_template_version() - Read the template version from the AFU
* @dev: the device for the AFU
* @fn: the AFU offsets
* @len: outputs the template length
* @version: outputs the major<<8,minor version
*
* Returns 0 on success, negative on failure
*/
static int read_template_version(struct pci_dev *dev, struct ocxl_fn_config *fn,
u16 *len, u16 *version)
{
u32 val32;
u8 major, minor;
int rc;
rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_VERSION, &val32);
if (rc)
return rc;
*len = EXTRACT_BITS(val32, 16, 31);
major = EXTRACT_BITS(val32, 8, 15);
minor = EXTRACT_BITS(val32, 0, 7);
*version = (major << 8) + minor;
return 0;
}
int ocxl_config_check_afu_index(struct pci_dev *dev,
struct ocxl_fn_config *fn, int afu_idx)
{
int rc;
u16 templ_version;
u16 len, expected_len;
pci_write_config_byte(dev,
fn->dvsec_afu_info_pos + OCXL_DVSEC_AFU_INFO_AFU_IDX,
afu_idx);
rc = read_template_version(dev, fn, &len, &templ_version);
if (rc)
return rc;
/* AFU index map can have holes, in which case we read all 0's */
if (!templ_version && !len)
return 0;
dev_dbg(&dev->dev, "AFU descriptor template version %d.%d\n",
templ_version >> 8, templ_version & 0xFF);
switch (templ_version) {
case 0x0005: // v0.5 was used prior to the spec approval
case 0x0100:
expected_len = OCXL_TEMPL_LEN_1_0;
break;
case 0x0101:
expected_len = OCXL_TEMPL_LEN_1_1;
break;
default:
dev_warn(&dev->dev, "Unknown AFU template version %#x\n",
templ_version);
expected_len = len;
}
if (len != expected_len)
dev_warn(&dev->dev,
"Unexpected template length %#x in AFU information, expected %#x for version %#x\n",
len, expected_len, templ_version);
return 1;
}
static int read_afu_name(struct pci_dev *dev, struct ocxl_fn_config *fn,
struct ocxl_afu_config *afu)
{
int i, rc;
u32 val, *ptr;
BUILD_BUG_ON(OCXL_AFU_NAME_SZ < OCXL_TEMPL_NAME_LEN);
for (i = 0; i < OCXL_TEMPL_NAME_LEN; i += 4) {
rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_NAME + i, &val);
if (rc)
return rc;
ptr = (u32 *) &afu->name[i];
*ptr = le32_to_cpu((__force __le32) val);
}
afu->name[OCXL_AFU_NAME_SZ - 1] = '\0'; /* play safe */
return 0;
}
static int read_afu_mmio(struct pci_dev *dev, struct ocxl_fn_config *fn,
struct ocxl_afu_config *afu)
{
int rc;
u32 val;
/*
* Global MMIO
*/
rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_MMIO_GLOBAL, &val);
if (rc)
return rc;
afu->global_mmio_bar = EXTRACT_BITS(val, 0, 2);
afu->global_mmio_offset = EXTRACT_BITS(val, 16, 31) << 16;
rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_MMIO_GLOBAL + 4, &val);
if (rc)
return rc;
afu->global_mmio_offset += (u64) val << 32;
rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_MMIO_GLOBAL_SZ, &val);
if (rc)
return rc;
afu->global_mmio_size = val;
/*
* Per-process MMIO
*/
rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_MMIO_PP, &val);
if (rc)
return rc;
afu->pp_mmio_bar = EXTRACT_BITS(val, 0, 2);
afu->pp_mmio_offset = EXTRACT_BITS(val, 16, 31) << 16;
rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_MMIO_PP + 4, &val);
if (rc)
return rc;
afu->pp_mmio_offset += (u64) val << 32;
rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_MMIO_PP_SZ, &val);
if (rc)
return rc;
afu->pp_mmio_stride = val;
return 0;
}
static int read_afu_control(struct pci_dev *dev, struct ocxl_afu_config *afu)
{
int pos;
u8 val8;
u16 val16;
pos = find_dvsec_afu_ctrl(dev, afu->idx);
if (!pos) {
dev_err(&dev->dev, "Can't find AFU control DVSEC for AFU %d\n",
afu->idx);
return -ENODEV;
}
afu->dvsec_afu_control_pos = pos;
pci_read_config_byte(dev, pos + OCXL_DVSEC_AFU_CTRL_PASID_SUP, &val8);
afu->pasid_supported_log = EXTRACT_BITS(val8, 0, 4);
pci_read_config_word(dev, pos + OCXL_DVSEC_AFU_CTRL_ACTAG_SUP, &val16);
afu->actag_supported = EXTRACT_BITS(val16, 0, 11);
return 0;
}
static bool char_allowed(int c)
{
/*
* Permitted Characters : Alphanumeric, hyphen, underscore, comma
*/
if ((c >= 0x30 && c <= 0x39) /* digits */ ||
(c >= 0x41 && c <= 0x5A) /* upper case */ ||
(c >= 0x61 && c <= 0x7A) /* lower case */ ||
c == 0 /* NULL */ ||
c == 0x2D /* - */ ||
c == 0x5F /* _ */ ||
c == 0x2C /* , */)
return true;
return false;
}
static int validate_afu(struct pci_dev *dev, struct ocxl_afu_config *afu)
{
int i;
if (!afu->name[0]) {
dev_err(&dev->dev, "Empty AFU name\n");
return -EINVAL;
}
for (i = 0; i < OCXL_TEMPL_NAME_LEN; i++) {
if (!char_allowed(afu->name[i])) {
dev_err(&dev->dev,
"Invalid character in AFU name\n");
return -EINVAL;
}
}
if (afu->global_mmio_bar != 0 &&
afu->global_mmio_bar != 2 &&
afu->global_mmio_bar != 4) {
dev_err(&dev->dev, "Invalid global MMIO bar number\n");
return -EINVAL;
}
if (afu->pp_mmio_bar != 0 &&
afu->pp_mmio_bar != 2 &&
afu->pp_mmio_bar != 4) {
dev_err(&dev->dev, "Invalid per-process MMIO bar number\n");
return -EINVAL;
}
return 0;
}
/**
* read_afu_lpc_memory_info() - Populate AFU metadata regarding LPC memory
* @dev: the device for the AFU
* @fn: the AFU offsets
* @afu: the AFU struct to populate the LPC metadata into
*
* Returns 0 on success, negative on failure
*/
static int read_afu_lpc_memory_info(struct pci_dev *dev,
struct ocxl_fn_config *fn,
struct ocxl_afu_config *afu)
{
int rc;
u32 val32;
u16 templ_version;
u16 templ_len;
u64 total_mem_size = 0;
u64 lpc_mem_size = 0;
afu->lpc_mem_offset = 0;
afu->lpc_mem_size = 0;
afu->special_purpose_mem_offset = 0;
afu->special_purpose_mem_size = 0;
/*
* For AFUs following template v1.0, the LPC memory covers the
* total memory. Its size is a power of 2.
*
* For AFUs with template >= v1.01, the total memory size is
* still a power of 2, but it is split in 2 parts:
* - the LPC memory, whose size can now be anything
* - the remainder memory is a special purpose memory, whose
* definition is AFU-dependent. It is not accessible through
* the usual commands for LPC memory
*/
rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_ALL_MEM_SZ, &val32);
if (rc)
return rc;
val32 = EXTRACT_BITS(val32, 0, 7);
if (!val32)
return 0; /* No LPC memory */
/*
* The configuration space spec allows for a memory size of up
* to 2^255 bytes.
*
* Current generation hardware uses 56-bit physical addresses,
* but we won't be able to get near close to that, as we won't
* have a hole big enough in the memory map. Let it pass in
* the driver for now. We'll get an error from the firmware
* when trying to configure something too big.
*/
total_mem_size = 1ull << val32;
rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_LPC_MEM_START, &val32);
if (rc)
return rc;
afu->lpc_mem_offset = val32;
rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_LPC_MEM_START + 4, &val32);
if (rc)
return rc;
afu->lpc_mem_offset |= (u64) val32 << 32;
rc = read_template_version(dev, fn, &templ_len, &templ_version);
if (rc)
return rc;
if (templ_version >= 0x0101) {
rc = read_afu_info(dev, fn,
OCXL_DVSEC_TEMPL_LPC_MEM_SZ, &val32);
if (rc)
return rc;
lpc_mem_size = val32;
rc = read_afu_info(dev, fn,
OCXL_DVSEC_TEMPL_LPC_MEM_SZ + 4, &val32);
if (rc)
return rc;
lpc_mem_size |= (u64) val32 << 32;
} else {
lpc_mem_size = total_mem_size;
}
afu->lpc_mem_size = lpc_mem_size;
if (lpc_mem_size < total_mem_size) {
afu->special_purpose_mem_offset =
afu->lpc_mem_offset + lpc_mem_size;
afu->special_purpose_mem_size =
total_mem_size - lpc_mem_size;
}
return 0;
}
int ocxl_config_read_afu(struct pci_dev *dev, struct ocxl_fn_config *fn,
struct ocxl_afu_config *afu, u8 afu_idx)
{
int rc;
u32 val32;
/*
* First, we need to write the AFU idx for the AFU we want to
* access.
*/
WARN_ON((afu_idx & OCXL_DVSEC_AFU_IDX_MASK) != afu_idx);
afu->idx = afu_idx;
pci_write_config_byte(dev,
fn->dvsec_afu_info_pos + OCXL_DVSEC_AFU_INFO_AFU_IDX,
afu->idx);
rc = read_afu_name(dev, fn, afu);
if (rc)
return rc;
rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_AFU_VERSION, &val32);
if (rc)
return rc;
afu->version_major = EXTRACT_BITS(val32, 24, 31);
afu->version_minor = EXTRACT_BITS(val32, 16, 23);
afu->afuc_type = EXTRACT_BITS(val32, 14, 15);
afu->afum_type = EXTRACT_BITS(val32, 12, 13);
afu->profile = EXTRACT_BITS(val32, 0, 7);
rc = read_afu_mmio(dev, fn, afu);
if (rc)
return rc;
rc = read_afu_lpc_memory_info(dev, fn, afu);
if (rc)
return rc;
rc = read_afu_control(dev, afu);
if (rc)
return rc;
dev_dbg(&dev->dev, "AFU configuration:\n");
dev_dbg(&dev->dev, " name = %s\n", afu->name);
dev_dbg(&dev->dev, " version = %d.%d\n", afu->version_major,
afu->version_minor);
dev_dbg(&dev->dev, " global mmio bar = %hhu\n", afu->global_mmio_bar);
dev_dbg(&dev->dev, " global mmio offset = %#llx\n",
afu->global_mmio_offset);
dev_dbg(&dev->dev, " global mmio size = %#x\n", afu->global_mmio_size);
dev_dbg(&dev->dev, " pp mmio bar = %hhu\n", afu->pp_mmio_bar);
dev_dbg(&dev->dev, " pp mmio offset = %#llx\n", afu->pp_mmio_offset);
dev_dbg(&dev->dev, " pp mmio stride = %#x\n", afu->pp_mmio_stride);
dev_dbg(&dev->dev, " lpc_mem offset = %#llx\n", afu->lpc_mem_offset);
dev_dbg(&dev->dev, " lpc_mem size = %#llx\n", afu->lpc_mem_size);
dev_dbg(&dev->dev, " special purpose mem offset = %#llx\n",
afu->special_purpose_mem_offset);
dev_dbg(&dev->dev, " special purpose mem size = %#llx\n",
afu->special_purpose_mem_size);
dev_dbg(&dev->dev, " pasid supported (log) = %u\n",
afu->pasid_supported_log);
dev_dbg(&dev->dev, " actag supported = %u\n",
afu->actag_supported);
rc = validate_afu(dev, afu);
return rc;
}
EXPORT_SYMBOL_GPL(ocxl_config_read_afu);
int ocxl_config_get_actag_info(struct pci_dev *dev, u16 *base, u16 *enabled,
u16 *supported)
{
int rc;
/*
* This is really a simple wrapper for the kernel API, to
* avoid an external driver using ocxl as a library to call
* platform-dependent code
*/
rc = pnv_ocxl_get_actag(dev, base, enabled, supported);
if (rc) {
dev_err(&dev->dev, "Can't get actag for device: %d\n", rc);
return rc;
}
return 0;
}
EXPORT_SYMBOL_GPL(ocxl_config_get_actag_info);
void ocxl_config_set_afu_actag(struct pci_dev *dev, int pos, int actag_base,
int actag_count)
{
u16 val;
val = actag_count & OCXL_DVSEC_ACTAG_MASK;
pci_write_config_byte(dev, pos + OCXL_DVSEC_AFU_CTRL_ACTAG_EN, val);
val = actag_base & OCXL_DVSEC_ACTAG_MASK;
pci_write_config_dword(dev, pos + OCXL_DVSEC_AFU_CTRL_ACTAG_BASE, val);
}
EXPORT_SYMBOL_GPL(ocxl_config_set_afu_actag);
int ocxl_config_get_pasid_info(struct pci_dev *dev, int *count)
{
return pnv_ocxl_get_pasid_count(dev, count);
}
void ocxl_config_set_afu_pasid(struct pci_dev *dev, int pos, int pasid_base,
u32 pasid_count_log)
{
u8 val8;
u32 val32;
val8 = pasid_count_log & OCXL_DVSEC_PASID_LOG_MASK;
pci_write_config_byte(dev, pos + OCXL_DVSEC_AFU_CTRL_PASID_EN, val8);
pci_read_config_dword(dev, pos + OCXL_DVSEC_AFU_CTRL_PASID_BASE,
&val32);
val32 &= ~OCXL_DVSEC_PASID_MASK;
val32 |= pasid_base & OCXL_DVSEC_PASID_MASK;
pci_write_config_dword(dev, pos + OCXL_DVSEC_AFU_CTRL_PASID_BASE,
val32);
}
EXPORT_SYMBOL_GPL(ocxl_config_set_afu_pasid);
void ocxl_config_set_afu_state(struct pci_dev *dev, int pos, int enable)
{
u8 val;
pci_read_config_byte(dev, pos + OCXL_DVSEC_AFU_CTRL_ENABLE, &val);
if (enable)
val |= 1;
else
val &= 0xFE;
pci_write_config_byte(dev, pos + OCXL_DVSEC_AFU_CTRL_ENABLE, val);
}
EXPORT_SYMBOL_GPL(ocxl_config_set_afu_state);
int ocxl_config_set_TL(struct pci_dev *dev, int tl_dvsec)
{
u32 val;
__be32 *be32ptr;
u8 timers;
int i, rc;
long recv_cap;
char *recv_rate;
/*
* Skip on function != 0, as the TL can only be defined on 0
*/
if (PCI_FUNC(dev->devfn) != 0)
return 0;
recv_rate = kzalloc(PNV_OCXL_TL_RATE_BUF_SIZE, GFP_KERNEL);
if (!recv_rate)
return -ENOMEM;
/*
* The spec defines 64 templates for messages in the
* Transaction Layer (TL).
*
* The host and device each support a subset, so we need to
* configure the transmitters on each side to send only
* templates the receiver understands, at a rate the receiver
* can process. Per the spec, template 0 must be supported by
* everybody. That's the template which has been used by the
* host and device so far.
*
* The sending rate limit must be set before the template is
* enabled.
*/
/*
* Device -> host
*/
rc = pnv_ocxl_get_tl_cap(dev, &recv_cap, recv_rate,
PNV_OCXL_TL_RATE_BUF_SIZE);
if (rc)
goto out;
for (i = 0; i < PNV_OCXL_TL_RATE_BUF_SIZE; i += 4) {
be32ptr = (__be32 *) &recv_rate[i];
pci_write_config_dword(dev,
tl_dvsec + OCXL_DVSEC_TL_SEND_RATE + i,
be32_to_cpu(*be32ptr));
}
val = recv_cap >> 32;
pci_write_config_dword(dev, tl_dvsec + OCXL_DVSEC_TL_SEND_CAP, val);
val = recv_cap & GENMASK(31, 0);
pci_write_config_dword(dev, tl_dvsec + OCXL_DVSEC_TL_SEND_CAP + 4, val);
/*
* Host -> device
*/
for (i = 0; i < PNV_OCXL_TL_RATE_BUF_SIZE; i += 4) {
pci_read_config_dword(dev,
tl_dvsec + OCXL_DVSEC_TL_RECV_RATE + i,
&val);
be32ptr = (__be32 *) &recv_rate[i];
*be32ptr = cpu_to_be32(val);
}
pci_read_config_dword(dev, tl_dvsec + OCXL_DVSEC_TL_RECV_CAP, &val);
recv_cap = (long) val << 32;
pci_read_config_dword(dev, tl_dvsec + OCXL_DVSEC_TL_RECV_CAP + 4, &val);
recv_cap |= val;
rc = pnv_ocxl_set_tl_conf(dev, recv_cap, __pa(recv_rate),
PNV_OCXL_TL_RATE_BUF_SIZE);
if (rc)
goto out;
/*
* Opencapi commands needing to be retried are classified per
* the TL in 2 groups: short and long commands.
*
* The short back off timer it not used for now. It will be
* for opencapi 4.0.
*
* The long back off timer is typically used when an AFU hits
* a page fault but the NPU is already processing one. So the
* AFU needs to wait before it can resubmit. Having a value
* too low doesn't break anything, but can generate extra
* traffic on the link.
* We set it to 1.6 us for now. It's shorter than, but in the
* same order of magnitude as the time spent to process a page
* fault.
*/
timers = 0x2 << 4; /* long timer = 1.6 us */
pci_write_config_byte(dev, tl_dvsec + OCXL_DVSEC_TL_BACKOFF_TIMERS,
timers);
rc = 0;
out:
kfree(recv_rate);
return rc;
}
EXPORT_SYMBOL_GPL(ocxl_config_set_TL);
int ocxl_config_terminate_pasid(struct pci_dev *dev, int afu_control, int pasid)
{
u32 val;
unsigned long timeout;
pci_read_config_dword(dev, afu_control + OCXL_DVSEC_AFU_CTRL_TERM_PASID,
&val);
if (EXTRACT_BIT(val, 20)) {
dev_err(&dev->dev,
"Can't terminate PASID %#x, previous termination didn't complete\n",
pasid);
return -EBUSY;
}
val &= ~OCXL_DVSEC_PASID_MASK;
val |= pasid & OCXL_DVSEC_PASID_MASK;
val |= BIT(20);
pci_write_config_dword(dev,
afu_control + OCXL_DVSEC_AFU_CTRL_TERM_PASID,
val);
timeout = jiffies + (HZ * OCXL_CFG_TIMEOUT);
pci_read_config_dword(dev, afu_control + OCXL_DVSEC_AFU_CTRL_TERM_PASID,
&val);
while (EXTRACT_BIT(val, 20)) {
if (time_after_eq(jiffies, timeout)) {
dev_err(&dev->dev,
"Timeout while waiting for AFU to terminate PASID %#x\n",
pasid);
return -EBUSY;
}
cpu_relax();
pci_read_config_dword(dev,
afu_control + OCXL_DVSEC_AFU_CTRL_TERM_PASID,
&val);
}
return 0;
}
EXPORT_SYMBOL_GPL(ocxl_config_terminate_pasid);
void ocxl_config_set_actag(struct pci_dev *dev, int func_dvsec, u32 tag_first,
u32 tag_count)
{
u32 val;
val = (tag_first & OCXL_DVSEC_ACTAG_MASK) << 16;
val |= tag_count & OCXL_DVSEC_ACTAG_MASK;
pci_write_config_dword(dev, func_dvsec + OCXL_DVSEC_FUNC_OFF_ACTAG,
val);
}
EXPORT_SYMBOL_GPL(ocxl_config_set_actag);
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