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guest.c
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/*
* Copyright 2015 IBM Corp.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/spinlock.h>
#include <linux/uaccess.h>
#include <linux/delay.h>
#include "cxl.h"
#include "hcalls.h"
#include "trace.h"
#define CXL_ERROR_DETECTED_EVENT 1
#define CXL_SLOT_RESET_EVENT 2
#define CXL_RESUME_EVENT 3
static void pci_error_handlers(struct cxl_afu *afu,
int bus_error_event,
pci_channel_state_t state)
{
struct pci_dev *afu_dev;
if (afu->phb == NULL)
return;
list_for_each_entry(afu_dev, &afu->phb->bus->devices, bus_list) {
if (!afu_dev->driver)
continue;
switch (bus_error_event) {
case CXL_ERROR_DETECTED_EVENT:
afu_dev->error_state = state;
if (afu_dev->driver->err_handler &&
afu_dev->driver->err_handler->error_detected)
afu_dev->driver->err_handler->error_detected(afu_dev, state);
break;
case CXL_SLOT_RESET_EVENT:
afu_dev->error_state = state;
if (afu_dev->driver->err_handler &&
afu_dev->driver->err_handler->slot_reset)
afu_dev->driver->err_handler->slot_reset(afu_dev);
break;
case CXL_RESUME_EVENT:
if (afu_dev->driver->err_handler &&
afu_dev->driver->err_handler->resume)
afu_dev->driver->err_handler->resume(afu_dev);
break;
}
}
}
static irqreturn_t guest_handle_psl_slice_error(struct cxl_context *ctx, u64 dsisr,
u64 errstat)
{
pr_devel("in %s\n", __func__);
dev_crit(&ctx->afu->dev, "PSL ERROR STATUS: 0x%.16llx\n", errstat);
return cxl_ops->ack_irq(ctx, 0, errstat);
}
static ssize_t guest_collect_vpd(struct cxl *adapter, struct cxl_afu *afu,
void *buf, size_t len)
{
unsigned int entries, mod;
unsigned long **vpd_buf = NULL;
struct sg_list *le;
int rc = 0, i, tocopy;
u64 out = 0;
if (buf == NULL)
return -EINVAL;
/* number of entries in the list */
entries = len / SG_BUFFER_SIZE;
mod = len % SG_BUFFER_SIZE;
if (mod)
entries++;
if (entries > SG_MAX_ENTRIES) {
entries = SG_MAX_ENTRIES;
len = SG_MAX_ENTRIES * SG_BUFFER_SIZE;
mod = 0;
}
vpd_buf = kzalloc(entries * sizeof(unsigned long *), GFP_KERNEL);
if (!vpd_buf)
return -ENOMEM;
le = (struct sg_list *)get_zeroed_page(GFP_KERNEL);
if (!le) {
rc = -ENOMEM;
goto err1;
}
for (i = 0; i < entries; i++) {
vpd_buf[i] = (unsigned long *)get_zeroed_page(GFP_KERNEL);
if (!vpd_buf[i]) {
rc = -ENOMEM;
goto err2;
}
le[i].phys_addr = cpu_to_be64(virt_to_phys(vpd_buf[i]));
le[i].len = cpu_to_be64(SG_BUFFER_SIZE);
if ((i == (entries - 1)) && mod)
le[i].len = cpu_to_be64(mod);
}
if (adapter)
rc = cxl_h_collect_vpd_adapter(adapter->guest->handle,
virt_to_phys(le), entries, &out);
else
rc = cxl_h_collect_vpd(afu->guest->handle, 0,
virt_to_phys(le), entries, &out);
pr_devel("length of available (entries: %i), vpd: %#llx\n",
entries, out);
if (!rc) {
/*
* hcall returns in 'out' the size of available VPDs.
* It fills the buffer with as much data as possible.
*/
if (out < len)
len = out;
rc = len;
if (out) {
for (i = 0; i < entries; i++) {
if (len < SG_BUFFER_SIZE)
tocopy = len;
else
tocopy = SG_BUFFER_SIZE;
memcpy(buf, vpd_buf[i], tocopy);
buf += tocopy;
len -= tocopy;
}
}
}
err2:
for (i = 0; i < entries; i++) {
if (vpd_buf[i])
free_page((unsigned long) vpd_buf[i]);
}
free_page((unsigned long) le);
err1:
kfree(vpd_buf);
return rc;
}
static int guest_get_irq_info(struct cxl_context *ctx, struct cxl_irq_info *info)
{
return cxl_h_collect_int_info(ctx->afu->guest->handle, ctx->process_token, info);
}
static irqreturn_t guest_psl_irq(int irq, void *data)
{
struct cxl_context *ctx = data;
struct cxl_irq_info irq_info;
int rc;
pr_devel("%d: received PSL interrupt %i\n", ctx->pe, irq);
rc = guest_get_irq_info(ctx, &irq_info);
if (rc) {
WARN(1, "Unable to get IRQ info: %i\n", rc);
return IRQ_HANDLED;
}
rc = cxl_irq(irq, ctx, &irq_info);
return rc;
}
static int afu_read_error_state(struct cxl_afu *afu, int *state_out)
{
u64 state;
int rc = 0;
rc = cxl_h_read_error_state(afu->guest->handle, &state);
if (!rc) {
WARN_ON(state != H_STATE_NORMAL &&
state != H_STATE_DISABLE &&
state != H_STATE_TEMP_UNAVAILABLE &&
state != H_STATE_PERM_UNAVAILABLE);
*state_out = state & 0xffffffff;
}
return rc;
}
static irqreturn_t guest_slice_irq_err(int irq, void *data)
{
struct cxl_afu *afu = data;
int rc;
u64 serr;
WARN(irq, "CXL SLICE ERROR interrupt %i\n", irq);
rc = cxl_h_get_fn_error_interrupt(afu->guest->handle, &serr);
if (rc) {
dev_crit(&afu->dev, "Couldn't read PSL_SERR_An: %d\n", rc);
return IRQ_HANDLED;
}
dev_crit(&afu->dev, "PSL_SERR_An: 0x%.16llx\n", serr);
rc = cxl_h_ack_fn_error_interrupt(afu->guest->handle, serr);
if (rc)
dev_crit(&afu->dev, "Couldn't ack slice error interrupt: %d\n",
rc);
return IRQ_HANDLED;
}
static int irq_alloc_range(struct cxl *adapter, int len, int *irq)
{
int i, n;
struct irq_avail *cur;
for (i = 0; i < adapter->guest->irq_nranges; i++) {
cur = &adapter->guest->irq_avail[i];
n = bitmap_find_next_zero_area(cur->bitmap, cur->range,
0, len, 0);
if (n < cur->range) {
bitmap_set(cur->bitmap, n, len);
*irq = cur->offset + n;
pr_devel("guest: allocate IRQs %#x->%#x\n",
*irq, *irq + len - 1);
return 0;
}
}
return -ENOSPC;
}
static int irq_free_range(struct cxl *adapter, int irq, int len)
{
int i, n;
struct irq_avail *cur;
if (len == 0)
return -ENOENT;
for (i = 0; i < adapter->guest->irq_nranges; i++) {
cur = &adapter->guest->irq_avail[i];
if (irq >= cur->offset &&
(irq + len) <= (cur->offset + cur->range)) {
n = irq - cur->offset;
bitmap_clear(cur->bitmap, n, len);
pr_devel("guest: release IRQs %#x->%#x\n",
irq, irq + len - 1);
return 0;
}
}
return -ENOENT;
}
static int guest_reset(struct cxl *adapter)
{
struct cxl_afu *afu = NULL;
int i, rc;
pr_devel("Adapter reset request\n");
for (i = 0; i < adapter->slices; i++) {
if ((afu = adapter->afu[i])) {
pci_error_handlers(afu, CXL_ERROR_DETECTED_EVENT,
pci_channel_io_frozen);
cxl_context_detach_all(afu);
}
}
rc = cxl_h_reset_adapter(adapter->guest->handle);
for (i = 0; i < adapter->slices; i++) {
if (!rc && (afu = adapter->afu[i])) {
pci_error_handlers(afu, CXL_SLOT_RESET_EVENT,
pci_channel_io_normal);
pci_error_handlers(afu, CXL_RESUME_EVENT, 0);
}
}
return rc;
}
static int guest_alloc_one_irq(struct cxl *adapter)
{
int irq;
spin_lock(&adapter->guest->irq_alloc_lock);
if (irq_alloc_range(adapter, 1, &irq))
irq = -ENOSPC;
spin_unlock(&adapter->guest->irq_alloc_lock);
return irq;
}
static void guest_release_one_irq(struct cxl *adapter, int irq)
{
spin_lock(&adapter->guest->irq_alloc_lock);
irq_free_range(adapter, irq, 1);
spin_unlock(&adapter->guest->irq_alloc_lock);
}
static int guest_alloc_irq_ranges(struct cxl_irq_ranges *irqs,
struct cxl *adapter, unsigned int num)
{
int i, try, irq;
memset(irqs, 0, sizeof(struct cxl_irq_ranges));
spin_lock(&adapter->guest->irq_alloc_lock);
for (i = 0; i < CXL_IRQ_RANGES && num; i++) {
try = num;
while (try) {
if (irq_alloc_range(adapter, try, &irq) == 0)
break;
try /= 2;
}
if (!try)
goto error;
irqs->offset[i] = irq;
irqs->range[i] = try;
num -= try;
}
if (num)
goto error;
spin_unlock(&adapter->guest->irq_alloc_lock);
return 0;
error:
for (i = 0; i < CXL_IRQ_RANGES; i++)
irq_free_range(adapter, irqs->offset[i], irqs->range[i]);
spin_unlock(&adapter->guest->irq_alloc_lock);
return -ENOSPC;
}
static void guest_release_irq_ranges(struct cxl_irq_ranges *irqs,
struct cxl *adapter)
{
int i;
spin_lock(&adapter->guest->irq_alloc_lock);
for (i = 0; i < CXL_IRQ_RANGES; i++)
irq_free_range(adapter, irqs->offset[i], irqs->range[i]);
spin_unlock(&adapter->guest->irq_alloc_lock);
}
static int guest_register_serr_irq(struct cxl_afu *afu)
{
afu->err_irq_name = kasprintf(GFP_KERNEL, "cxl-%s-err",
dev_name(&afu->dev));
if (!afu->err_irq_name)
return -ENOMEM;
if (!(afu->serr_virq = cxl_map_irq(afu->adapter, afu->serr_hwirq,
guest_slice_irq_err, afu, afu->err_irq_name))) {
kfree(afu->err_irq_name);
afu->err_irq_name = NULL;
return -ENOMEM;
}
return 0;
}
static void guest_release_serr_irq(struct cxl_afu *afu)
{
cxl_unmap_irq(afu->serr_virq, afu);
cxl_ops->release_one_irq(afu->adapter, afu->serr_hwirq);
kfree(afu->err_irq_name);
}
static int guest_ack_irq(struct cxl_context *ctx, u64 tfc, u64 psl_reset_mask)
{
return cxl_h_control_faults(ctx->afu->guest->handle, ctx->process_token,
tfc >> 32, (psl_reset_mask != 0));
}
static void disable_afu_irqs(struct cxl_context *ctx)
{
irq_hw_number_t hwirq;
unsigned int virq;
int r, i;
pr_devel("Disabling AFU(%d) interrupts\n", ctx->afu->slice);
for (r = 0; r < CXL_IRQ_RANGES; r++) {
hwirq = ctx->irqs.offset[r];
for (i = 0; i < ctx->irqs.range[r]; hwirq++, i++) {
virq = irq_find_mapping(NULL, hwirq);
disable_irq(virq);
}
}
}
static void enable_afu_irqs(struct cxl_context *ctx)
{
irq_hw_number_t hwirq;
unsigned int virq;
int r, i;
pr_devel("Enabling AFU(%d) interrupts\n", ctx->afu->slice);
for (r = 0; r < CXL_IRQ_RANGES; r++) {
hwirq = ctx->irqs.offset[r];
for (i = 0; i < ctx->irqs.range[r]; hwirq++, i++) {
virq = irq_find_mapping(NULL, hwirq);
enable_irq(virq);
}
}
}
static int _guest_afu_cr_readXX(int sz, struct cxl_afu *afu, int cr_idx,
u64 offset, u64 *val)
{
unsigned long cr;
char c;
int rc = 0;
if (afu->crs_len < sz)
return -ENOENT;
if (unlikely(offset >= afu->crs_len))
return -ERANGE;
cr = get_zeroed_page(GFP_KERNEL);
if (!cr)
return -ENOMEM;
rc = cxl_h_get_config(afu->guest->handle, cr_idx, offset,
virt_to_phys((void *)cr), sz);
if (rc)
goto err;
switch (sz) {
case 1:
c = *((char *) cr);
*val = c;
break;
case 2:
*val = in_le16((u16 *)cr);
break;
case 4:
*val = in_le32((unsigned *)cr);
break;
case 8:
*val = in_le64((u64 *)cr);
break;
default:
WARN_ON(1);
}
err:
free_page(cr);
return rc;
}
static int guest_afu_cr_read32(struct cxl_afu *afu, int cr_idx, u64 offset,
u32 *out)
{
int rc;
u64 val;
rc = _guest_afu_cr_readXX(4, afu, cr_idx, offset, &val);
if (!rc)
*out = (u32) val;
return rc;
}
static int guest_afu_cr_read16(struct cxl_afu *afu, int cr_idx, u64 offset,
u16 *out)
{
int rc;
u64 val;
rc = _guest_afu_cr_readXX(2, afu, cr_idx, offset, &val);
if (!rc)
*out = (u16) val;
return rc;
}
static int guest_afu_cr_read8(struct cxl_afu *afu, int cr_idx, u64 offset,
u8 *out)
{
int rc;
u64 val;
rc = _guest_afu_cr_readXX(1, afu, cr_idx, offset, &val);
if (!rc)
*out = (u8) val;
return rc;
}
static int guest_afu_cr_read64(struct cxl_afu *afu, int cr_idx, u64 offset,
u64 *out)
{
return _guest_afu_cr_readXX(8, afu, cr_idx, offset, out);
}
static int guest_afu_cr_write32(struct cxl_afu *afu, int cr, u64 off, u32 in)
{
/* config record is not writable from guest */
return -EPERM;
}
static int guest_afu_cr_write16(struct cxl_afu *afu, int cr, u64 off, u16 in)
{
/* config record is not writable from guest */
return -EPERM;
}
static int guest_afu_cr_write8(struct cxl_afu *afu, int cr, u64 off, u8 in)
{
/* config record is not writable from guest */
return -EPERM;
}
static int attach_afu_directed(struct cxl_context *ctx, u64 wed, u64 amr)
{
struct cxl_process_element_hcall *elem;
struct cxl *adapter = ctx->afu->adapter;
const struct cred *cred;
u32 pid, idx;
int rc, r, i;
u64 mmio_addr, mmio_size;
__be64 flags = 0;
/* Must be 8 byte aligned and cannot cross a 4096 byte boundary */
if (!(elem = (struct cxl_process_element_hcall *)
get_zeroed_page(GFP_KERNEL)))
return -ENOMEM;
elem->version = cpu_to_be64(CXL_PROCESS_ELEMENT_VERSION);
if (ctx->kernel) {
pid = 0;
flags |= CXL_PE_TRANSLATION_ENABLED;
flags |= CXL_PE_PRIVILEGED_PROCESS;
if (mfmsr() & MSR_SF)
flags |= CXL_PE_64_BIT;
} else {
pid = current->pid;
flags |= CXL_PE_PROBLEM_STATE;
flags |= CXL_PE_TRANSLATION_ENABLED;
if (!test_tsk_thread_flag(current, TIF_32BIT))
flags |= CXL_PE_64_BIT;
cred = get_current_cred();
if (uid_eq(cred->euid, GLOBAL_ROOT_UID))
flags |= CXL_PE_PRIVILEGED_PROCESS;
put_cred(cred);
}
elem->flags = cpu_to_be64(flags);
elem->common.tid = cpu_to_be32(0); /* Unused */
elem->common.pid = cpu_to_be32(pid);
elem->common.csrp = cpu_to_be64(0); /* disable */
elem->common.aurp0 = cpu_to_be64(0); /* disable */
elem->common.aurp1 = cpu_to_be64(0); /* disable */
cxl_prefault(ctx, wed);
elem->common.sstp0 = cpu_to_be64(ctx->sstp0);
elem->common.sstp1 = cpu_to_be64(ctx->sstp1);
for (r = 0; r < CXL_IRQ_RANGES; r++) {
for (i = 0; i < ctx->irqs.range[r]; i++) {
if (r == 0 && i == 0) {
elem->pslVirtualIsn = cpu_to_be32(ctx->irqs.offset[0]);
} else {
idx = ctx->irqs.offset[r] + i - adapter->guest->irq_base_offset;
elem->applicationVirtualIsnBitmap[idx / 8] |= 0x80 >> (idx % 8);
}
}
}
elem->common.amr = cpu_to_be64(amr);
elem->common.wed = cpu_to_be64(wed);
disable_afu_irqs(ctx);
rc = cxl_h_attach_process(ctx->afu->guest->handle, elem,
&ctx->process_token, &mmio_addr, &mmio_size);
if (rc == H_SUCCESS) {
if (ctx->master || !ctx->afu->pp_psa) {
ctx->psn_phys = ctx->afu->psn_phys;
ctx->psn_size = ctx->afu->adapter->ps_size;
} else {
ctx->psn_phys = mmio_addr;
ctx->psn_size = mmio_size;
}
if (ctx->afu->pp_psa && mmio_size &&
ctx->afu->pp_size == 0) {
/*
* There's no property in the device tree to read the
* pp_size. We only find out at the 1st attach.
* Compared to bare-metal, it is too late and we
* should really lock here. However, on powerVM,
* pp_size is really only used to display in /sys.
* Being discussed with pHyp for their next release.
*/
ctx->afu->pp_size = mmio_size;
}
/* from PAPR: process element is bytes 4-7 of process token */
ctx->external_pe = ctx->process_token & 0xFFFFFFFF;
pr_devel("CXL pe=%i is known as %i for pHyp, mmio_size=%#llx",
ctx->pe, ctx->external_pe, ctx->psn_size);
ctx->pe_inserted = true;
enable_afu_irqs(ctx);
}
free_page((u64)elem);
return rc;
}
static int guest_attach_process(struct cxl_context *ctx, bool kernel, u64 wed, u64 amr)
{
pr_devel("in %s\n", __func__);
ctx->kernel = kernel;
if (ctx->afu->current_mode == CXL_MODE_DIRECTED)
return attach_afu_directed(ctx, wed, amr);
/* dedicated mode not supported on FW840 */
return -EINVAL;
}
static int detach_afu_directed(struct cxl_context *ctx)
{
if (!ctx->pe_inserted)
return 0;
if (cxl_h_detach_process(ctx->afu->guest->handle, ctx->process_token))
return -1;
return 0;
}
static int guest_detach_process(struct cxl_context *ctx)
{
pr_devel("in %s\n", __func__);
trace_cxl_detach(ctx);
if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu))
return -EIO;
if (ctx->afu->current_mode == CXL_MODE_DIRECTED)
return detach_afu_directed(ctx);
return -EINVAL;
}
static void guest_release_afu(struct device *dev)
{
struct cxl_afu *afu = to_cxl_afu(dev);
pr_devel("%s\n", __func__);
idr_destroy(&afu->contexts_idr);
kfree(afu->guest);
kfree(afu);
}
ssize_t cxl_guest_read_afu_vpd(struct cxl_afu *afu, void *buf, size_t len)
{
return guest_collect_vpd(NULL, afu, buf, len);
}
#define ERR_BUFF_MAX_COPY_SIZE PAGE_SIZE
static ssize_t guest_afu_read_err_buffer(struct cxl_afu *afu, char *buf,
loff_t off, size_t count)
{
void *tbuf = NULL;
int rc = 0;
tbuf = (void *) get_zeroed_page(GFP_KERNEL);
if (!tbuf)
return -ENOMEM;
rc = cxl_h_get_afu_err(afu->guest->handle,
off & 0x7,
virt_to_phys(tbuf),
count);
if (rc)
goto err;
if (count > ERR_BUFF_MAX_COPY_SIZE)
count = ERR_BUFF_MAX_COPY_SIZE - (off & 0x7);
memcpy(buf, tbuf, count);
err:
free_page((u64)tbuf);
return rc;
}
static int guest_afu_check_and_enable(struct cxl_afu *afu)
{
return 0;
}
static bool guest_support_attributes(const char *attr_name,
enum cxl_attrs type)
{
switch (type) {
case CXL_ADAPTER_ATTRS:
if ((strcmp(attr_name, "base_image") == 0) ||
(strcmp(attr_name, "load_image_on_perst") == 0) ||
(strcmp(attr_name, "perst_reloads_same_image") == 0) ||
(strcmp(attr_name, "image_loaded") == 0))
return false;
break;
case CXL_AFU_MASTER_ATTRS:
if ((strcmp(attr_name, "pp_mmio_off") == 0))
return false;
break;
case CXL_AFU_ATTRS:
break;
default:
break;
}
return true;
}
static int activate_afu_directed(struct cxl_afu *afu)
{
int rc;
dev_info(&afu->dev, "Activating AFU(%d) directed mode\n", afu->slice);
afu->current_mode = CXL_MODE_DIRECTED;
afu->num_procs = afu->max_procs_virtualised;
if ((rc = cxl_chardev_m_afu_add(afu)))
return rc;
if ((rc = cxl_sysfs_afu_m_add(afu)))
goto err;
if ((rc = cxl_chardev_s_afu_add(afu)))
goto err1;
return 0;
err1:
cxl_sysfs_afu_m_remove(afu);
err:
cxl_chardev_afu_remove(afu);
return rc;
}
static int guest_afu_activate_mode(struct cxl_afu *afu, int mode)
{
if (!mode)
return 0;
if (!(mode & afu->modes_supported))
return -EINVAL;
if (mode == CXL_MODE_DIRECTED)
return activate_afu_directed(afu);
if (mode == CXL_MODE_DEDICATED)
dev_err(&afu->dev, "Dedicated mode not supported\n");
return -EINVAL;
}
static int deactivate_afu_directed(struct cxl_afu *afu)
{
dev_info(&afu->dev, "Deactivating AFU(%d) directed mode\n", afu->slice);
afu->current_mode = 0;
afu->num_procs = 0;
cxl_sysfs_afu_m_remove(afu);
cxl_chardev_afu_remove(afu);
cxl_ops->afu_reset(afu);
return 0;
}
static int guest_afu_deactivate_mode(struct cxl_afu *afu, int mode)
{
if (!mode)
return 0;
if (!(mode & afu->modes_supported))
return -EINVAL;
if (mode == CXL_MODE_DIRECTED)
return deactivate_afu_directed(afu);
return 0;
}
static int guest_afu_reset(struct cxl_afu *afu)
{
pr_devel("AFU(%d) reset request\n", afu->slice);
return cxl_h_reset_afu(afu->guest->handle);
}
static int guest_map_slice_regs(struct cxl_afu *afu)
{
if (!(afu->p2n_mmio = ioremap(afu->guest->p2n_phys, afu->guest->p2n_size))) {
dev_err(&afu->dev, "Error mapping AFU(%d) MMIO regions\n",
afu->slice);
return -ENOMEM;
}
return 0;
}
static void guest_unmap_slice_regs(struct cxl_afu *afu)
{
if (afu->p2n_mmio)
iounmap(afu->p2n_mmio);
}
static int afu_update_state(struct cxl_afu *afu)
{
int rc, cur_state;
rc = afu_read_error_state(afu, &cur_state);
if (rc)
return rc;
if (afu->guest->previous_state == cur_state)
return 0;
pr_devel("AFU(%d) update state to %#x\n", afu->slice, cur_state);
switch (cur_state) {
case H_STATE_NORMAL:
afu->guest->previous_state = cur_state;
rc = 1;
break;
case H_STATE_DISABLE:
pci_error_handlers(afu, CXL_ERROR_DETECTED_EVENT,
pci_channel_io_frozen);
cxl_context_detach_all(afu);
if ((rc = cxl_ops->afu_reset(afu)))
pr_devel("reset hcall failed %d\n", rc);
rc = afu_read_error_state(afu, &cur_state);
if (!rc && cur_state == H_STATE_NORMAL) {
pci_error_handlers(afu, CXL_SLOT_RESET_EVENT,
pci_channel_io_normal);
pci_error_handlers(afu, CXL_RESUME_EVENT, 0);
rc = 1;
}
afu->guest->previous_state = 0;
break;
case H_STATE_TEMP_UNAVAILABLE:
afu->guest->previous_state = cur_state;
break;
case H_STATE_PERM_UNAVAILABLE:
dev_err(&afu->dev, "AFU is in permanent error state\n");
pci_error_handlers(afu, CXL_ERROR_DETECTED_EVENT,
pci_channel_io_perm_failure);
afu->guest->previous_state = cur_state;
break;
default:
pr_err("Unexpected AFU(%d) error state: %#x\n",
afu->slice, cur_state);
return -EINVAL;
}
return rc;
}
static int afu_do_recovery(struct cxl_afu *afu)
{
int rc;
/* many threads can arrive here, in case of detach_all for example.
* Only one needs to drive the recovery
*/
if (mutex_trylock(&afu->guest->recovery_lock)) {
rc = afu_update_state(afu);
mutex_unlock(&afu->guest->recovery_lock);
return rc;
}
return 0;
}
static bool guest_link_ok(struct cxl *cxl, struct cxl_afu *afu)
{
int state;
if (afu) {
if (afu_read_error_state(afu, &state) ||
state != H_STATE_NORMAL) {
if (afu_do_recovery(afu) > 0) {
/* check again in case we've just fixed it */
if (!afu_read_error_state(afu, &state) &&
state == H_STATE_NORMAL)
return true;
}
return false;
}
}
return true;
}
static int afu_properties_look_ok(struct cxl_afu *afu)
{
if (afu->pp_irqs < 0) {
dev_err(&afu->dev, "Unexpected per-process minimum interrupt value\n");
return -EINVAL;
}
if (afu->max_procs_virtualised < 1) {
dev_err(&afu->dev, "Unexpected max number of processes virtualised value\n");
return -EINVAL;
}
if (afu->crs_len < 0) {
dev_err(&afu->dev, "Unexpected configuration record size value\n");
return -EINVAL;
}
return 0;
}
int cxl_guest_init_afu(struct cxl *adapter, int slice, struct device_node *afu_np)
{
struct cxl_afu *afu;
bool free = true;
int rc;
pr_devel("in %s - AFU(%d)\n", __func__, slice);
if (!(afu = cxl_alloc_afu(adapter, slice)))
return -ENOMEM;
if (!(afu->guest = kzalloc(sizeof(struct cxl_afu_guest), GFP_KERNEL))) {
kfree(afu);
return -ENOMEM;
}
mutex_init(&afu->guest->recovery_lock);
if ((rc = dev_set_name(&afu->dev, "afu%i.%i",
adapter->adapter_num,
slice)))
goto err1;
adapter->slices++;
if ((rc = cxl_of_read_afu_handle(afu, afu_np)))
goto err1;
if ((rc = cxl_ops->afu_reset(afu)))
goto err1;
if ((rc = cxl_of_read_afu_properties(afu, afu_np)))
goto err1;
if ((rc = afu_properties_look_ok(afu)))
goto err1;
if ((rc = guest_map_slice_regs(afu)))
goto err1;
if ((rc = guest_register_serr_irq(afu)))
goto err2;
/*
* After we call this function we must not free the afu directly, even
* if it returns an error!
*/
if ((rc = cxl_register_afu(afu)))
goto err_put1;
if ((rc = cxl_sysfs_afu_add(afu)))
goto err_put1;
/*
* pHyp doesn't expose the programming models supported by the
* AFU. pHyp currently only supports directed mode. If it adds
* dedicated mode later, this version of cxl has no way to
* detect it. So we'll initialize the driver, but the first
* attach will fail.
* Being discussed with pHyp to do better (likely new property)
*/
if (afu->max_procs_virtualised == 1)
afu->modes_supported = CXL_MODE_DEDICATED;
else
afu->modes_supported = CXL_MODE_DIRECTED;
if ((rc = cxl_afu_select_best_mode(afu)))
goto err_put2;
adapter->afu[afu->slice] = afu;
afu->enabled = true;
if ((rc = cxl_pci_vphb_add(afu)))
dev_info(&afu->dev, "Can't register vPHB\n");
return 0;
err_put2:
cxl_sysfs_afu_remove(afu);
err_put1:
device_unregister(&afu->dev);
free = false;
guest_release_serr_irq(afu);
err2: