#include <linux/mm.h>
#include <linux/uaccess.h>
#include <asm/synch.h>
-#include <misc/cxl.h>
+#include <misc/cxl-base.h>
#include "cxl.h"
#include "trace.h"
rc = -EBUSY;
goto out;
}
- pr_devel_ratelimited("AFU control... (0x%.16llx)\n",
+
+ 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);
}
/* This will disable as well as reset */
-int cxl_afu_reset(struct cxl_afu *afu)
+int __cxl_afu_reset(struct cxl_afu *afu)
{
pr_devel("AFU reset request\n");
false);
}
-static int afu_check_and_enable(struct cxl_afu *afu)
+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);
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);
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%.16llx PSL_DSISR: 0x%.16llx\n", PSL_CNTL, dsisr);
+ 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%.16llx, DAR: 0x%.16llx\n", dsisr, dar);
+ 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%.16llx\n", 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();
return ((spa_size / 8) - 96) / 17;
}
-static int alloc_spa(struct cxl_afu *afu)
+int cxl_alloc_spa(struct cxl_afu *afu)
{
- u64 spap;
-
/* Work out how many pages to allocate */
afu->spa_order = 0;
do {
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 |= 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);
-
- return 0;
}
-static void release_spa(struct cxl_afu *afu)
+static inline void detach_spa(struct cxl_afu *afu)
{
cxl_p1n_write(afu, CXL_PSL_SPAP_An, 0);
- free_pages((unsigned long) afu->spa, afu->spa_order);
+}
+
+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)
dev_warn(&adapter->dev, "WARNING: CXL adapter wide TLBIA timed out!\n");
return -EBUSY;
}
+ if (!cxl_adapter_link_ok(adapter))
+ return -EIO;
cpu_relax();
}
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;
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;
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;
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");
mutex_lock(&ctx->afu->spa_mutex);
pr_devel("%s Terminate pe: %i started\n", __func__, ctx->pe);
- rc = do_process_element_cmd(ctx, CXL_SPA_SW_CMD_TERMINATE,
- CXL_PE_SOFTWARE_STATE_V | CXL_PE_SOFTWARE_STATE_T);
+ /* 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);
mutex_lock(&ctx->afu->spa_mutex);
pr_devel("%s Remove pe: %i started\n", __func__, ctx->pe);
- if (!(rc = do_process_element_cmd(ctx, CXL_SPA_SW_CMD_REMOVE, 0)))
+
+ /* 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);
}
-static void assign_psn_space(struct cxl_context *ctx)
+void cxl_assign_psn_space(struct cxl_context *ctx)
{
if (!ctx->afu->pp_size || ctx->master) {
ctx->psn_phys = ctx->afu->psn_phys;
dev_info(&afu->dev, "Activating AFU directed mode\n");
- if (alloc_spa(afu))
- return -ENOMEM;
+ afu->num_procs = afu->max_procs_virtualised;
+ 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;
#define set_endian(sr) ((sr) &= ~(CXL_PSL_SR_An_LE))
#endif
+static u64 calculate_sr(struct cxl_context *ctx)
+{
+ u64 sr = 0;
+
+ set_endian(sr);
+ 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;
+ 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)
{
- u64 sr;
+ u32 pid;
int r, result;
- assign_psn_space(ctx);
+ 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));
- sr = 0;
- if (ctx->master)
- sr |= CXL_PSL_SR_An_MP;
- if (mfspr(SPRN_LPCR) & LPCR_TC)
- sr |= CXL_PSL_SR_An_TC;
- /* HV=0, PR=1, R=1 for userspace
- * For kernel contexts: this would need to change
- */
- 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;
- ctx->elem->common.pid = cpu_to_be32(current->pid);
+ pid = current->pid;
+ if (ctx->kernel)
+ pid = 0;
ctx->elem->common.tid = 0;
- ctx->elem->sr = cpu_to_be64(sr);
+ 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.wed = cpu_to_be64(wed);
/* first guy needs to enable */
- if ((result = afu_check_and_enable(ctx->afu)))
+ if ((result = cxl_afu_check_and_enable(ctx->afu)))
return result;
- add_process_element(ctx);
-
- return 0;
+ return add_process_element(ctx);
}
static int deactivate_afu_directed(struct cxl_afu *afu)
cxl_sysfs_afu_m_remove(afu);
cxl_chardev_afu_remove(afu);
- cxl_afu_reset(afu);
+ __cxl_afu_reset(afu);
cxl_afu_disable(afu);
cxl_psl_purge(afu);
- release_spa(afu);
-
return 0;
}
static int attach_dedicated(struct cxl_context *ctx, u64 wed, u64 amr)
{
struct cxl_afu *afu = ctx->afu;
- u64 sr;
+ u64 pid;
int rc;
- sr = 0;
- set_endian(sr);
- if (ctx->master)
- sr |= CXL_PSL_SR_An_MP;
- if (mfspr(SPRN_LPCR) & LPCR_TC)
- sr |= CXL_PSL_SR_An_TC;
- sr |= CXL_PSL_SR_An_PR | CXL_PSL_SR_An_R;
- if (!test_tsk_thread_flag(current, TIF_32BIT))
- sr |= CXL_PSL_SR_An_SF;
- cxl_p2n_write(afu, CXL_PSL_PID_TID_An, (u64)current->pid << 32);
- cxl_p1n_write(afu, CXL_PSL_SR_An, sr);
+ 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_p2n_write(afu, CXL_PSL_AMR_An, amr);
/* master only context for dedicated */
- assign_psn_space(ctx);
+ cxl_assign_psn_space(ctx);
- if ((rc = cxl_afu_reset(afu)))
+ if ((rc = __cxl_afu_reset(afu)))
return rc;
cxl_p2n_write(afu, CXL_PSL_WED_An, wed);
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)
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);
static inline int detach_process_native_dedicated(struct cxl_context *ctx)
{
- cxl_afu_reset(ctx->afu);
+ __cxl_afu_reset(ctx->afu);
cxl_afu_disable(ctx->afu);
cxl_psl_purge(ctx->afu);
return 0;
{
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);
{
u64 dsisr;
- pr_devel("RECOVERING FROM PSL ERROR... (0x%.16llx)\n", errstat);
+ pr_devel("RECOVERING FROM PSL ERROR... (0x%016llx)\n", errstat);
/* Clear PSL_DSISR[PE] */
dsisr = cxl_p2n_read(afu, CXL_PSL_DSISR_An);
Code Review / kvmfornfv.git / blobdiff