linux/drivers/misc/cxl/native.c
Daniel Axtens 05155772f6 cxl: Allocate and release the SPA with the AFU
Previously the SPA was allocated and freed upon entering and leaving
AFU-directed mode. This causes some issues for error recovery - contexts
hold a pointer inside the SPA, and they may persist after the AFU has
been detached.

We would ideally like to allocate the SPA when the AFU is allocated, and
release it until the AFU is released. However, we don't know how big the
SPA needs to be until we read the AFU descriptor.

Therefore, restructure the code:

 - Allocate the SPA only once, on the first attach.

 - Release the SPA only when the entire AFU is being released (not
   detached). Guard the release with a NULL check, so we don't free
   if it was never allocated (e.g. dedicated mode)

Acked-by: Cyril Bur <cyrilbur@gmail.com>
Signed-off-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2015-08-14 21:32:04 +10:00

787 lines
20 KiB
C

/*
* Copyright 2014 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/sched.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/mutex.h>
#include <linux/mm.h>
#include <linux/uaccess.h>
#include <asm/synch.h>
#include <misc/cxl-base.h>
#include "cxl.h"
#include "trace.h"
static int afu_control(struct cxl_afu *afu, u64 command,
u64 result, u64 mask, bool enabled)
{
u64 AFU_Cntl = cxl_p2n_read(afu, CXL_AFU_Cntl_An);
unsigned long timeout = jiffies + (HZ * CXL_TIMEOUT);
int rc = 0;
spin_lock(&afu->afu_cntl_lock);
pr_devel("AFU command starting: %llx\n", command);
trace_cxl_afu_ctrl(afu, command);
cxl_p2n_write(afu, CXL_AFU_Cntl_An, AFU_Cntl | command);
AFU_Cntl = cxl_p2n_read(afu, CXL_AFU_Cntl_An);
while ((AFU_Cntl & mask) != result) {
if (time_after_eq(jiffies, timeout)) {
dev_warn(&afu->dev, "WARNING: AFU control timed out!\n");
rc = -EBUSY;
goto out;
}
if (!cxl_adapter_link_ok(afu->adapter)) {
afu->enabled = enabled;
rc = -EIO;
goto out;
}
pr_devel_ratelimited("AFU control... (0x%016llx)\n",
AFU_Cntl | command);
cpu_relax();
AFU_Cntl = cxl_p2n_read(afu, CXL_AFU_Cntl_An);
};
pr_devel("AFU command complete: %llx\n", command);
afu->enabled = enabled;
out:
trace_cxl_afu_ctrl_done(afu, command, rc);
spin_unlock(&afu->afu_cntl_lock);
return rc;
}
static int afu_enable(struct cxl_afu *afu)
{
pr_devel("AFU enable request\n");
return afu_control(afu, CXL_AFU_Cntl_An_E,
CXL_AFU_Cntl_An_ES_Enabled,
CXL_AFU_Cntl_An_ES_MASK, true);
}
int cxl_afu_disable(struct cxl_afu *afu)
{
pr_devel("AFU disable request\n");
return afu_control(afu, 0, CXL_AFU_Cntl_An_ES_Disabled,
CXL_AFU_Cntl_An_ES_MASK, false);
}
/* This will disable as well as reset */
int __cxl_afu_reset(struct cxl_afu *afu)
{
pr_devel("AFU reset request\n");
return afu_control(afu, CXL_AFU_Cntl_An_RA,
CXL_AFU_Cntl_An_RS_Complete | CXL_AFU_Cntl_An_ES_Disabled,
CXL_AFU_Cntl_An_RS_MASK | CXL_AFU_Cntl_An_ES_MASK,
false);
}
int cxl_afu_check_and_enable(struct cxl_afu *afu)
{
if (!cxl_adapter_link_ok(afu->adapter)) {
WARN(1, "Refusing to enable afu while link down!\n");
return -EIO;
}
if (afu->enabled)
return 0;
return afu_enable(afu);
}
int cxl_psl_purge(struct cxl_afu *afu)
{
u64 PSL_CNTL = cxl_p1n_read(afu, CXL_PSL_SCNTL_An);
u64 AFU_Cntl = cxl_p2n_read(afu, CXL_AFU_Cntl_An);
u64 dsisr, dar;
u64 start, end;
unsigned long timeout = jiffies + (HZ * CXL_TIMEOUT);
int rc = 0;
trace_cxl_psl_ctrl(afu, CXL_PSL_SCNTL_An_Pc);
pr_devel("PSL purge request\n");
if (!cxl_adapter_link_ok(afu->adapter)) {
dev_warn(&afu->dev, "PSL Purge called with link down, ignoring\n");
rc = -EIO;
goto out;
}
if ((AFU_Cntl & CXL_AFU_Cntl_An_ES_MASK) != CXL_AFU_Cntl_An_ES_Disabled) {
WARN(1, "psl_purge request while AFU not disabled!\n");
cxl_afu_disable(afu);
}
cxl_p1n_write(afu, CXL_PSL_SCNTL_An,
PSL_CNTL | CXL_PSL_SCNTL_An_Pc);
start = local_clock();
PSL_CNTL = cxl_p1n_read(afu, CXL_PSL_SCNTL_An);
while ((PSL_CNTL & CXL_PSL_SCNTL_An_Ps_MASK)
== CXL_PSL_SCNTL_An_Ps_Pending) {
if (time_after_eq(jiffies, timeout)) {
dev_warn(&afu->dev, "WARNING: PSL Purge timed out!\n");
rc = -EBUSY;
goto out;
}
if (!cxl_adapter_link_ok(afu->adapter)) {
rc = -EIO;
goto out;
}
dsisr = cxl_p2n_read(afu, CXL_PSL_DSISR_An);
pr_devel_ratelimited("PSL purging... PSL_CNTL: 0x%016llx PSL_DSISR: 0x%016llx\n", PSL_CNTL, dsisr);
if (dsisr & CXL_PSL_DSISR_TRANS) {
dar = cxl_p2n_read(afu, CXL_PSL_DAR_An);
dev_notice(&afu->dev, "PSL purge terminating pending translation, DSISR: 0x%016llx, DAR: 0x%016llx\n", dsisr, dar);
cxl_p2n_write(afu, CXL_PSL_TFC_An, CXL_PSL_TFC_An_AE);
} else if (dsisr) {
dev_notice(&afu->dev, "PSL purge acknowledging pending non-translation fault, DSISR: 0x%016llx\n", dsisr);
cxl_p2n_write(afu, CXL_PSL_TFC_An, CXL_PSL_TFC_An_A);
} else {
cpu_relax();
}
PSL_CNTL = cxl_p1n_read(afu, CXL_PSL_SCNTL_An);
};
end = local_clock();
pr_devel("PSL purged in %lld ns\n", end - start);
cxl_p1n_write(afu, CXL_PSL_SCNTL_An,
PSL_CNTL & ~CXL_PSL_SCNTL_An_Pc);
out:
trace_cxl_psl_ctrl_done(afu, CXL_PSL_SCNTL_An_Pc, rc);
return rc;
}
static int spa_max_procs(int spa_size)
{
/*
* From the CAIA:
* end_of_SPA_area = SPA_Base + ((n+4) * 128) + (( ((n*8) + 127) >> 7) * 128) + 255
* Most of that junk is really just an overly-complicated way of saying
* the last 256 bytes are __aligned(128), so it's really:
* end_of_SPA_area = end_of_PSL_queue_area + __aligned(128) 255
* and
* end_of_PSL_queue_area = SPA_Base + ((n+4) * 128) + (n*8) - 1
* so
* sizeof(SPA) = ((n+4) * 128) + (n*8) + __aligned(128) 256
* Ignore the alignment (which is safe in this case as long as we are
* careful with our rounding) and solve for n:
*/
return ((spa_size / 8) - 96) / 17;
}
int cxl_alloc_spa(struct cxl_afu *afu)
{
/* Work out how many pages to allocate */
afu->spa_order = 0;
do {
afu->spa_order++;
afu->spa_size = (1 << afu->spa_order) * PAGE_SIZE;
afu->spa_max_procs = spa_max_procs(afu->spa_size);
} while (afu->spa_max_procs < afu->num_procs);
WARN_ON(afu->spa_size > 0x100000); /* Max size supported by the hardware */
if (!(afu->spa = (struct cxl_process_element *)
__get_free_pages(GFP_KERNEL | __GFP_ZERO, afu->spa_order))) {
pr_err("cxl_alloc_spa: Unable to allocate scheduled process area\n");
return -ENOMEM;
}
pr_devel("spa pages: %i afu->spa_max_procs: %i afu->num_procs: %i\n",
1<<afu->spa_order, afu->spa_max_procs, afu->num_procs);
return 0;
}
static void attach_spa(struct cxl_afu *afu)
{
u64 spap;
afu->sw_command_status = (__be64 *)((char *)afu->spa +
((afu->spa_max_procs + 3) * 128));
spap = virt_to_phys(afu->spa) & CXL_PSL_SPAP_Addr;
spap |= ((afu->spa_size >> (12 - CXL_PSL_SPAP_Size_Shift)) - 1) & CXL_PSL_SPAP_Size;
spap |= CXL_PSL_SPAP_V;
pr_devel("cxl: SPA allocated at 0x%p. Max processes: %i, sw_command_status: 0x%p CXL_PSL_SPAP_An=0x%016llx\n", afu->spa, afu->spa_max_procs, afu->sw_command_status, spap);
cxl_p1n_write(afu, CXL_PSL_SPAP_An, spap);
}
static inline void detach_spa(struct cxl_afu *afu)
{
cxl_p1n_write(afu, CXL_PSL_SPAP_An, 0);
}
void cxl_release_spa(struct cxl_afu *afu)
{
if (afu->spa) {
free_pages((unsigned long) afu->spa, afu->spa_order);
afu->spa = NULL;
}
}
int cxl_tlb_slb_invalidate(struct cxl *adapter)
{
unsigned long timeout = jiffies + (HZ * CXL_TIMEOUT);
pr_devel("CXL adapter wide TLBIA & SLBIA\n");
cxl_p1_write(adapter, CXL_PSL_AFUSEL, CXL_PSL_AFUSEL_A);
cxl_p1_write(adapter, CXL_PSL_TLBIA, CXL_TLB_SLB_IQ_ALL);
while (cxl_p1_read(adapter, CXL_PSL_TLBIA) & CXL_TLB_SLB_P) {
if (time_after_eq(jiffies, timeout)) {
dev_warn(&adapter->dev, "WARNING: CXL adapter wide TLBIA timed out!\n");
return -EBUSY;
}
if (!cxl_adapter_link_ok(adapter))
return -EIO;
cpu_relax();
}
cxl_p1_write(adapter, CXL_PSL_SLBIA, CXL_TLB_SLB_IQ_ALL);
while (cxl_p1_read(adapter, CXL_PSL_SLBIA) & CXL_TLB_SLB_P) {
if (time_after_eq(jiffies, timeout)) {
dev_warn(&adapter->dev, "WARNING: CXL adapter wide SLBIA timed out!\n");
return -EBUSY;
}
if (!cxl_adapter_link_ok(adapter))
return -EIO;
cpu_relax();
}
return 0;
}
int cxl_afu_slbia(struct cxl_afu *afu)
{
unsigned long timeout = jiffies + (HZ * CXL_TIMEOUT);
pr_devel("cxl_afu_slbia issuing SLBIA command\n");
cxl_p2n_write(afu, CXL_SLBIA_An, CXL_TLB_SLB_IQ_ALL);
while (cxl_p2n_read(afu, CXL_SLBIA_An) & CXL_TLB_SLB_P) {
if (time_after_eq(jiffies, timeout)) {
dev_warn(&afu->dev, "WARNING: CXL AFU SLBIA timed out!\n");
return -EBUSY;
}
/* If the adapter has gone down, we can assume that we
* will PERST it and that will invalidate everything.
*/
if (!cxl_adapter_link_ok(afu->adapter))
return -EIO;
cpu_relax();
}
return 0;
}
static int cxl_write_sstp(struct cxl_afu *afu, u64 sstp0, u64 sstp1)
{
int rc;
/* 1. Disable SSTP by writing 0 to SSTP1[V] */
cxl_p2n_write(afu, CXL_SSTP1_An, 0);
/* 2. Invalidate all SLB entries */
if ((rc = cxl_afu_slbia(afu)))
return rc;
/* 3. Set SSTP0_An */
cxl_p2n_write(afu, CXL_SSTP0_An, sstp0);
/* 4. Set SSTP1_An */
cxl_p2n_write(afu, CXL_SSTP1_An, sstp1);
return 0;
}
/* Using per slice version may improve performance here. (ie. SLBIA_An) */
static void slb_invalid(struct cxl_context *ctx)
{
struct cxl *adapter = ctx->afu->adapter;
u64 slbia;
WARN_ON(!mutex_is_locked(&ctx->afu->spa_mutex));
cxl_p1_write(adapter, CXL_PSL_LBISEL,
((u64)be32_to_cpu(ctx->elem->common.pid) << 32) |
be32_to_cpu(ctx->elem->lpid));
cxl_p1_write(adapter, CXL_PSL_SLBIA, CXL_TLB_SLB_IQ_LPIDPID);
while (1) {
if (!cxl_adapter_link_ok(adapter))
break;
slbia = cxl_p1_read(adapter, CXL_PSL_SLBIA);
if (!(slbia & CXL_TLB_SLB_P))
break;
cpu_relax();
}
}
static int do_process_element_cmd(struct cxl_context *ctx,
u64 cmd, u64 pe_state)
{
u64 state;
unsigned long timeout = jiffies + (HZ * CXL_TIMEOUT);
int rc = 0;
trace_cxl_llcmd(ctx, cmd);
WARN_ON(!ctx->afu->enabled);
ctx->elem->software_state = cpu_to_be32(pe_state);
smp_wmb();
*(ctx->afu->sw_command_status) = cpu_to_be64(cmd | 0 | ctx->pe);
smp_mb();
cxl_p1n_write(ctx->afu, CXL_PSL_LLCMD_An, cmd | ctx->pe);
while (1) {
if (time_after_eq(jiffies, timeout)) {
dev_warn(&ctx->afu->dev, "WARNING: Process Element Command timed out!\n");
rc = -EBUSY;
goto out;
}
if (!cxl_adapter_link_ok(ctx->afu->adapter)) {
dev_warn(&ctx->afu->dev, "WARNING: Device link down, aborting Process Element Command!\n");
rc = -EIO;
goto out;
}
state = be64_to_cpup(ctx->afu->sw_command_status);
if (state == ~0ULL) {
pr_err("cxl: Error adding process element to AFU\n");
rc = -1;
goto out;
}
if ((state & (CXL_SPA_SW_CMD_MASK | CXL_SPA_SW_STATE_MASK | CXL_SPA_SW_LINK_MASK)) ==
(cmd | (cmd >> 16) | ctx->pe))
break;
/*
* The command won't finish in the PSL if there are
* outstanding DSIs. Hence we need to yield here in
* case there are outstanding DSIs that we need to
* service. Tuning possiblity: we could wait for a
* while before sched
*/
schedule();
}
out:
trace_cxl_llcmd_done(ctx, cmd, rc);
return rc;
}
static int add_process_element(struct cxl_context *ctx)
{
int rc = 0;
mutex_lock(&ctx->afu->spa_mutex);
pr_devel("%s Adding pe: %i started\n", __func__, ctx->pe);
if (!(rc = do_process_element_cmd(ctx, CXL_SPA_SW_CMD_ADD, CXL_PE_SOFTWARE_STATE_V)))
ctx->pe_inserted = true;
pr_devel("%s Adding pe: %i finished\n", __func__, ctx->pe);
mutex_unlock(&ctx->afu->spa_mutex);
return rc;
}
static int terminate_process_element(struct cxl_context *ctx)
{
int rc = 0;
/* fast path terminate if it's already invalid */
if (!(ctx->elem->software_state & cpu_to_be32(CXL_PE_SOFTWARE_STATE_V)))
return rc;
mutex_lock(&ctx->afu->spa_mutex);
pr_devel("%s Terminate pe: %i started\n", __func__, ctx->pe);
/* We could be asked to terminate when the hw is down. That
* should always succeed: it's not running if the hw has gone
* away and is being reset.
*/
if (cxl_adapter_link_ok(ctx->afu->adapter))
rc = do_process_element_cmd(ctx, CXL_SPA_SW_CMD_TERMINATE,
CXL_PE_SOFTWARE_STATE_V | CXL_PE_SOFTWARE_STATE_T);
ctx->elem->software_state = 0; /* Remove Valid bit */
pr_devel("%s Terminate pe: %i finished\n", __func__, ctx->pe);
mutex_unlock(&ctx->afu->spa_mutex);
return rc;
}
static int remove_process_element(struct cxl_context *ctx)
{
int rc = 0;
mutex_lock(&ctx->afu->spa_mutex);
pr_devel("%s Remove pe: %i started\n", __func__, ctx->pe);
/* We could be asked to remove when the hw is down. Again, if
* the hw is down, the PE is gone, so we succeed.
*/
if (cxl_adapter_link_ok(ctx->afu->adapter))
rc = do_process_element_cmd(ctx, CXL_SPA_SW_CMD_REMOVE, 0);
if (!rc)
ctx->pe_inserted = false;
slb_invalid(ctx);
pr_devel("%s Remove pe: %i finished\n", __func__, ctx->pe);
mutex_unlock(&ctx->afu->spa_mutex);
return rc;
}
void cxl_assign_psn_space(struct cxl_context *ctx)
{
if (!ctx->afu->pp_size || ctx->master) {
ctx->psn_phys = ctx->afu->psn_phys;
ctx->psn_size = ctx->afu->adapter->ps_size;
} else {
ctx->psn_phys = ctx->afu->psn_phys +
(ctx->afu->pp_offset + ctx->afu->pp_size * ctx->pe);
ctx->psn_size = ctx->afu->pp_size;
}
}
static int activate_afu_directed(struct cxl_afu *afu)
{
int rc;
dev_info(&afu->dev, "Activating AFU directed mode\n");
if (afu->spa == NULL) {
if (cxl_alloc_spa(afu))
return -ENOMEM;
}
attach_spa(afu);
cxl_p1n_write(afu, CXL_PSL_SCNTL_An, CXL_PSL_SCNTL_An_PM_AFU);
cxl_p1n_write(afu, CXL_PSL_AMOR_An, 0xFFFFFFFFFFFFFFFFULL);
cxl_p1n_write(afu, CXL_PSL_ID_An, CXL_PSL_ID_An_F | CXL_PSL_ID_An_L);
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;
}
#ifdef CONFIG_CPU_LITTLE_ENDIAN
#define set_endian(sr) ((sr) |= CXL_PSL_SR_An_LE)
#else
#define set_endian(sr) ((sr) &= ~(CXL_PSL_SR_An_LE))
#endif
static u64 calculate_sr(struct cxl_context *ctx)
{
u64 sr = 0;
if (ctx->master)
sr |= CXL_PSL_SR_An_MP;
if (mfspr(SPRN_LPCR) & LPCR_TC)
sr |= CXL_PSL_SR_An_TC;
if (ctx->kernel) {
sr |= CXL_PSL_SR_An_R | (mfmsr() & MSR_SF);
sr |= CXL_PSL_SR_An_HV;
} else {
sr |= CXL_PSL_SR_An_PR | CXL_PSL_SR_An_R;
set_endian(sr);
sr &= ~(CXL_PSL_SR_An_HV);
if (!test_tsk_thread_flag(current, TIF_32BIT))
sr |= CXL_PSL_SR_An_SF;
}
return sr;
}
static int attach_afu_directed(struct cxl_context *ctx, u64 wed, u64 amr)
{
u32 pid;
int r, result;
cxl_assign_psn_space(ctx);
ctx->elem->ctxtime = 0; /* disable */
ctx->elem->lpid = cpu_to_be32(mfspr(SPRN_LPID));
ctx->elem->haurp = 0; /* disable */
ctx->elem->sdr = cpu_to_be64(mfspr(SPRN_SDR1));
pid = current->pid;
if (ctx->kernel)
pid = 0;
ctx->elem->common.tid = 0;
ctx->elem->common.pid = cpu_to_be32(pid);
ctx->elem->sr = cpu_to_be64(calculate_sr(ctx));
ctx->elem->common.csrp = 0; /* disable */
ctx->elem->common.aurp0 = 0; /* disable */
ctx->elem->common.aurp1 = 0; /* disable */
cxl_prefault(ctx, wed);
ctx->elem->common.sstp0 = cpu_to_be64(ctx->sstp0);
ctx->elem->common.sstp1 = cpu_to_be64(ctx->sstp1);
for (r = 0; r < CXL_IRQ_RANGES; r++) {
ctx->elem->ivte_offsets[r] = cpu_to_be16(ctx->irqs.offset[r]);
ctx->elem->ivte_ranges[r] = cpu_to_be16(ctx->irqs.range[r]);
}
ctx->elem->common.amr = cpu_to_be64(amr);
ctx->elem->common.wed = cpu_to_be64(wed);
/* first guy needs to enable */
if ((result = cxl_afu_check_and_enable(ctx->afu)))
return result;
return add_process_element(ctx);
}
static int deactivate_afu_directed(struct cxl_afu *afu)
{
dev_info(&afu->dev, "Deactivating AFU directed mode\n");
afu->current_mode = 0;
afu->num_procs = 0;
cxl_sysfs_afu_m_remove(afu);
cxl_chardev_afu_remove(afu);
__cxl_afu_reset(afu);
cxl_afu_disable(afu);
cxl_psl_purge(afu);
return 0;
}
static int activate_dedicated_process(struct cxl_afu *afu)
{
dev_info(&afu->dev, "Activating dedicated process mode\n");
cxl_p1n_write(afu, CXL_PSL_SCNTL_An, CXL_PSL_SCNTL_An_PM_Process);
cxl_p1n_write(afu, CXL_PSL_CtxTime_An, 0); /* disable */
cxl_p1n_write(afu, CXL_PSL_SPAP_An, 0); /* disable */
cxl_p1n_write(afu, CXL_PSL_AMOR_An, 0xFFFFFFFFFFFFFFFFULL);
cxl_p1n_write(afu, CXL_PSL_LPID_An, mfspr(SPRN_LPID));
cxl_p1n_write(afu, CXL_HAURP_An, 0); /* disable */
cxl_p1n_write(afu, CXL_PSL_SDR_An, mfspr(SPRN_SDR1));
cxl_p2n_write(afu, CXL_CSRP_An, 0); /* disable */
cxl_p2n_write(afu, CXL_AURP0_An, 0); /* disable */
cxl_p2n_write(afu, CXL_AURP1_An, 0); /* disable */
afu->current_mode = CXL_MODE_DEDICATED;
afu->num_procs = 1;
return cxl_chardev_d_afu_add(afu);
}
static int attach_dedicated(struct cxl_context *ctx, u64 wed, u64 amr)
{
struct cxl_afu *afu = ctx->afu;
u64 pid;
int rc;
pid = (u64)current->pid << 32;
if (ctx->kernel)
pid = 0;
cxl_p2n_write(afu, CXL_PSL_PID_TID_An, pid);
cxl_p1n_write(afu, CXL_PSL_SR_An, calculate_sr(ctx));
if ((rc = cxl_write_sstp(afu, ctx->sstp0, ctx->sstp1)))
return rc;
cxl_prefault(ctx, wed);
cxl_p1n_write(afu, CXL_PSL_IVTE_Offset_An,
(((u64)ctx->irqs.offset[0] & 0xffff) << 48) |
(((u64)ctx->irqs.offset[1] & 0xffff) << 32) |
(((u64)ctx->irqs.offset[2] & 0xffff) << 16) |
((u64)ctx->irqs.offset[3] & 0xffff));
cxl_p1n_write(afu, CXL_PSL_IVTE_Limit_An, (u64)
(((u64)ctx->irqs.range[0] & 0xffff) << 48) |
(((u64)ctx->irqs.range[1] & 0xffff) << 32) |
(((u64)ctx->irqs.range[2] & 0xffff) << 16) |
((u64)ctx->irqs.range[3] & 0xffff));
cxl_p2n_write(afu, CXL_PSL_AMR_An, amr);
/* master only context for dedicated */
cxl_assign_psn_space(ctx);
if ((rc = __cxl_afu_reset(afu)))
return rc;
cxl_p2n_write(afu, CXL_PSL_WED_An, wed);
return afu_enable(afu);
}
static int deactivate_dedicated_process(struct cxl_afu *afu)
{
dev_info(&afu->dev, "Deactivating dedicated process mode\n");
afu->current_mode = 0;
afu->num_procs = 0;
cxl_chardev_afu_remove(afu);
return 0;
}
int _cxl_afu_deactivate_mode(struct cxl_afu *afu, int mode)
{
if (mode == CXL_MODE_DIRECTED)
return deactivate_afu_directed(afu);
if (mode == CXL_MODE_DEDICATED)
return deactivate_dedicated_process(afu);
return 0;
}
int cxl_afu_deactivate_mode(struct cxl_afu *afu)
{
return _cxl_afu_deactivate_mode(afu, afu->current_mode);
}
int cxl_afu_activate_mode(struct cxl_afu *afu, int mode)
{
if (!mode)
return 0;
if (!(mode & afu->modes_supported))
return -EINVAL;
if (!cxl_adapter_link_ok(afu->adapter)) {
WARN(1, "Device link is down, refusing to activate!\n");
return -EIO;
}
if (mode == CXL_MODE_DIRECTED)
return activate_afu_directed(afu);
if (mode == CXL_MODE_DEDICATED)
return activate_dedicated_process(afu);
return -EINVAL;
}
int cxl_attach_process(struct cxl_context *ctx, bool kernel, u64 wed, u64 amr)
{
if (!cxl_adapter_link_ok(ctx->afu->adapter)) {
WARN(1, "Device link is down, refusing to attach process!\n");
return -EIO;
}
ctx->kernel = kernel;
if (ctx->afu->current_mode == CXL_MODE_DIRECTED)
return attach_afu_directed(ctx, wed, amr);
if (ctx->afu->current_mode == CXL_MODE_DEDICATED)
return attach_dedicated(ctx, wed, amr);
return -EINVAL;
}
static inline int detach_process_native_dedicated(struct cxl_context *ctx)
{
__cxl_afu_reset(ctx->afu);
cxl_afu_disable(ctx->afu);
cxl_psl_purge(ctx->afu);
return 0;
}
static inline int detach_process_native_afu_directed(struct cxl_context *ctx)
{
if (!ctx->pe_inserted)
return 0;
if (terminate_process_element(ctx))
return -1;
if (remove_process_element(ctx))
return -1;
return 0;
}
int cxl_detach_process(struct cxl_context *ctx)
{
trace_cxl_detach(ctx);
if (ctx->afu->current_mode == CXL_MODE_DEDICATED)
return detach_process_native_dedicated(ctx);
return detach_process_native_afu_directed(ctx);
}
int cxl_get_irq(struct cxl_afu *afu, struct cxl_irq_info *info)
{
u64 pidtid;
/* If the adapter has gone away, we can't get any meaningful
* information.
*/
if (!cxl_adapter_link_ok(afu->adapter))
return -EIO;
info->dsisr = cxl_p2n_read(afu, CXL_PSL_DSISR_An);
info->dar = cxl_p2n_read(afu, CXL_PSL_DAR_An);
info->dsr = cxl_p2n_read(afu, CXL_PSL_DSR_An);
pidtid = cxl_p2n_read(afu, CXL_PSL_PID_TID_An);
info->pid = pidtid >> 32;
info->tid = pidtid & 0xffffffff;
info->afu_err = cxl_p2n_read(afu, CXL_AFU_ERR_An);
info->errstat = cxl_p2n_read(afu, CXL_PSL_ErrStat_An);
return 0;
}
static void recover_psl_err(struct cxl_afu *afu, u64 errstat)
{
u64 dsisr;
pr_devel("RECOVERING FROM PSL ERROR... (0x%016llx)\n", errstat);
/* Clear PSL_DSISR[PE] */
dsisr = cxl_p2n_read(afu, CXL_PSL_DSISR_An);
cxl_p2n_write(afu, CXL_PSL_DSISR_An, dsisr & ~CXL_PSL_DSISR_An_PE);
/* Write 1s to clear error status bits */
cxl_p2n_write(afu, CXL_PSL_ErrStat_An, errstat);
}
int cxl_ack_irq(struct cxl_context *ctx, u64 tfc, u64 psl_reset_mask)
{
trace_cxl_psl_irq_ack(ctx, tfc);
if (tfc)
cxl_p2n_write(ctx->afu, CXL_PSL_TFC_An, tfc);
if (psl_reset_mask)
recover_psl_err(ctx->afu, psl_reset_mask);
return 0;
}
int cxl_check_error(struct cxl_afu *afu)
{
return (cxl_p1n_read(afu, CXL_PSL_SCNTL_An) == ~0ULL);
}