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-rw-r--r--drivers/misc/cxl/api.c12
-rw-r--r--drivers/misc/cxl/cxl.h1
-rw-r--r--drivers/misc/cxl/guest.c1
-rw-r--r--drivers/misc/cxl/native.c74
4 files changed, 71 insertions, 17 deletions
diff --git a/drivers/misc/cxl/api.c b/drivers/misc/cxl/api.c
index 6d228ccd884d..99081b821f12 100644
--- a/drivers/misc/cxl/api.c
+++ b/drivers/misc/cxl/api.c
@@ -102,7 +102,10 @@ int cxl_allocate_afu_irqs(struct cxl_context *ctx, int num)
if (num == 0)
num = ctx->afu->pp_irqs;
res = afu_allocate_irqs(ctx, num);
- if (!res && !cpu_has_feature(CPU_FTR_HVMODE)) {
+ if (res)
+ return res;
+
+ if (!cpu_has_feature(CPU_FTR_HVMODE)) {
/* In a guest, the PSL interrupt is not multiplexed. It was
* allocated above, and we need to set its handler
*/
@@ -110,6 +113,13 @@ int cxl_allocate_afu_irqs(struct cxl_context *ctx, int num)
if (hwirq)
cxl_map_irq(ctx->afu->adapter, hwirq, cxl_ops->psl_interrupt, ctx, "psl");
}
+
+ if (ctx->status == STARTED) {
+ if (cxl_ops->update_ivtes)
+ cxl_ops->update_ivtes(ctx);
+ else WARN(1, "BUG: cxl_allocate_afu_irqs must be called prior to starting the context on this platform\n");
+ }
+
return res;
}
EXPORT_SYMBOL_GPL(cxl_allocate_afu_irqs);
diff --git a/drivers/misc/cxl/cxl.h b/drivers/misc/cxl/cxl.h
index 4fe50788ff45..fbec29bd6575 100644
--- a/drivers/misc/cxl/cxl.h
+++ b/drivers/misc/cxl/cxl.h
@@ -855,6 +855,7 @@ struct cxl_backend_ops {
int (*attach_process)(struct cxl_context *ctx, bool kernel,
u64 wed, u64 amr);
int (*detach_process)(struct cxl_context *ctx);
+ void (*update_ivtes)(struct cxl_context *ctx);
bool (*support_attributes)(const char *attr_name, enum cxl_attrs type);
bool (*link_ok)(struct cxl *cxl, struct cxl_afu *afu);
void (*release_afu)(struct device *dev);
diff --git a/drivers/misc/cxl/guest.c b/drivers/misc/cxl/guest.c
index bc8d0b9870eb..1edba5248620 100644
--- a/drivers/misc/cxl/guest.c
+++ b/drivers/misc/cxl/guest.c
@@ -1182,6 +1182,7 @@ const struct cxl_backend_ops cxl_guest_ops = {
.ack_irq = guest_ack_irq,
.attach_process = guest_attach_process,
.detach_process = guest_detach_process,
+ .update_ivtes = NULL,
.support_attributes = guest_support_attributes,
.link_ok = guest_link_ok,
.release_afu = guest_release_afu,
diff --git a/drivers/misc/cxl/native.c b/drivers/misc/cxl/native.c
index 55d8a1459f28..efe8af9d7c7e 100644
--- a/drivers/misc/cxl/native.c
+++ b/drivers/misc/cxl/native.c
@@ -430,7 +430,6 @@ static int remove_process_element(struct cxl_context *ctx)
return rc;
}
-
void cxl_assign_psn_space(struct cxl_context *ctx)
{
if (!ctx->afu->pp_size || ctx->master) {
@@ -507,10 +506,39 @@ static u64 calculate_sr(struct cxl_context *ctx)
return sr;
}
+static void update_ivtes_directed(struct cxl_context *ctx)
+{
+ bool need_update = (ctx->status == STARTED);
+ int r;
+
+ if (need_update) {
+ WARN_ON(terminate_process_element(ctx));
+ WARN_ON(remove_process_element(ctx));
+ }
+
+ 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]);
+ }
+
+ /*
+ * Theoretically we could use the update llcmd, instead of a
+ * terminate/remove/add (or if an atomic update was required we could
+ * do a suspend/update/resume), however it seems there might be issues
+ * with the update llcmd on some cards (including those using an XSL on
+ * an ASIC) so for now it's safest to go with the commands that are
+ * known to work. In the future if we come across a situation where the
+ * card may be performing transactions using the same PE while we are
+ * doing this update we might need to revisit this.
+ */
+ if (need_update)
+ WARN_ON(add_process_element(ctx));
+}
+
static int attach_afu_directed(struct cxl_context *ctx, u64 wed, u64 amr)
{
u32 pid;
- int r, result;
+ int result;
cxl_assign_psn_space(ctx);
@@ -545,10 +573,7 @@ static int attach_afu_directed(struct cxl_context *ctx, u64 wed, u64 amr)
ctx->irqs.range[0] = 1;
}
- 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]);
- }
+ update_ivtes_directed(ctx);
ctx->elem->common.amr = cpu_to_be64(amr);
ctx->elem->common.wed = cpu_to_be64(wed);
@@ -600,6 +625,22 @@ static int activate_dedicated_process(struct cxl_afu *afu)
return cxl_chardev_d_afu_add(afu);
}
+static void update_ivtes_dedicated(struct cxl_context *ctx)
+{
+ struct cxl_afu *afu = ctx->afu;
+
+ 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));
+}
+
static int attach_dedicated(struct cxl_context *ctx, u64 wed, u64 amr)
{
struct cxl_afu *afu = ctx->afu;
@@ -618,16 +659,7 @@ static int attach_dedicated(struct cxl_context *ctx, u64 wed, u64 amr)
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));
+ update_ivtes_dedicated(ctx);
cxl_p2n_write(afu, CXL_PSL_AMR_An, amr);
@@ -709,6 +741,15 @@ static inline int detach_process_native_dedicated(struct cxl_context *ctx)
return 0;
}
+static void native_update_ivtes(struct cxl_context *ctx)
+{
+ if (ctx->afu->current_mode == CXL_MODE_DIRECTED)
+ return update_ivtes_directed(ctx);
+ if (ctx->afu->current_mode == CXL_MODE_DEDICATED)
+ return update_ivtes_dedicated(ctx);
+ WARN(1, "native_update_ivtes: Bad mode\n");
+}
+
static inline int detach_process_native_afu_directed(struct cxl_context *ctx)
{
if (!ctx->pe_inserted)
@@ -1128,6 +1169,7 @@ const struct cxl_backend_ops cxl_native_ops = {
.irq_wait = native_irq_wait,
.attach_process = native_attach_process,
.detach_process = native_detach_process,
+ .update_ivtes = native_update_ivtes,
.support_attributes = native_support_attributes,
.link_ok = cxl_adapter_link_ok,
.release_afu = cxl_pci_release_afu,
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-08 11:48:29 +0300