diff options
| -rw-r--r-- | drivers/misc/cxl/context.c | 7 | ||||
| -rw-r--r-- | drivers/misc/cxl/cxl.h | 2 | ||||
| -rw-r--r-- | drivers/misc/cxl/native.c | 31 |
3 files changed, 40 insertions, 0 deletions
diff --git a/drivers/misc/cxl/context.c b/drivers/misc/cxl/context.c index 10370f280500..7edea9c19199 100644 --- a/drivers/misc/cxl/context.c +++ b/drivers/misc/cxl/context.c @@ -223,6 +223,13 @@ int __detach_context(struct cxl_context *ctx) cxl_ops->link_ok(ctx->afu->adapter, ctx->afu)); flush_work(&ctx->fault_work); /* Only needed for dedicated process */ + /* + * Wait until no further interrupts are presented by the PSL + * for this context. + */ + if (cxl_ops->irq_wait) + cxl_ops->irq_wait(ctx); + /* release the reference to the group leader and mm handling pid */ put_pid(ctx->pid); put_pid(ctx->glpid); diff --git a/drivers/misc/cxl/cxl.h b/drivers/misc/cxl/cxl.h index 38e21cf7806e..73dc2a33da74 100644 --- a/drivers/misc/cxl/cxl.h +++ b/drivers/misc/cxl/cxl.h @@ -274,6 +274,7 @@ static const cxl_p2n_reg_t CXL_PSL_WED_An = {0x0A0}; #define CXL_PSL_DSISR_An_PE (1ull << (63-4)) /* PSL Error (implementation specific) */ #define CXL_PSL_DSISR_An_AE (1ull << (63-5)) /* AFU Error */ #define CXL_PSL_DSISR_An_OC (1ull << (63-6)) /* OS Context Warning */ +#define CXL_PSL_DSISR_PENDING (CXL_PSL_DSISR_TRANS | CXL_PSL_DSISR_An_PE | CXL_PSL_DSISR_An_AE | CXL_PSL_DSISR_An_OC) /* NOTE: Bits 32:63 are undefined if DSISR[DS] = 1 */ #define CXL_PSL_DSISR_An_M DSISR_NOHPTE /* PTE not found */ #define CXL_PSL_DSISR_An_P DSISR_PROTFAULT /* Storage protection violation */ @@ -855,6 +856,7 @@ struct cxl_backend_ops { u64 dsisr, u64 errstat); irqreturn_t (*psl_interrupt)(int irq, void *data); int (*ack_irq)(struct cxl_context *ctx, u64 tfc, u64 psl_reset_mask); + void (*irq_wait)(struct cxl_context *ctx); int (*attach_process)(struct cxl_context *ctx, bool kernel, u64 wed, u64 amr); int (*detach_process)(struct cxl_context *ctx); diff --git a/drivers/misc/cxl/native.c b/drivers/misc/cxl/native.c index 387fcbdf9793..ecf7557cd657 100644 --- a/drivers/misc/cxl/native.c +++ b/drivers/misc/cxl/native.c @@ -14,6 +14,7 @@ #include <linux/mutex.h> #include <linux/mm.h> #include <linux/uaccess.h> +#include <linux/delay.h> #include <asm/synch.h> #include <misc/cxl-base.h> @@ -797,6 +798,35 @@ static irqreturn_t native_irq_multiplexed(int irq, void *data) return fail_psl_irq(afu, &irq_info); } +void native_irq_wait(struct cxl_context *ctx) +{ + u64 dsisr; + int timeout = 1000; + int ph; + + /* + * Wait until no further interrupts are presented by the PSL + * for this context. + */ + while (timeout--) { + ph = cxl_p2n_read(ctx->afu, CXL_PSL_PEHandle_An) & 0xffff; + if (ph != ctx->pe) + return; + dsisr = cxl_p2n_read(ctx->afu, CXL_PSL_DSISR_An); + if ((dsisr & CXL_PSL_DSISR_PENDING) == 0) + return; + /* + * We are waiting for the workqueue to process our + * irq, so need to let that run here. + */ + msleep(1); + } + + dev_warn(&ctx->afu->dev, "WARNING: waiting on DSI for PE %i" + " DSISR %016llx!\n", ph, dsisr); + return; +} + static irqreturn_t native_slice_irq_err(int irq, void *data) { struct cxl_afu *afu = data; @@ -1076,6 +1106,7 @@ const struct cxl_backend_ops cxl_native_ops = { .handle_psl_slice_error = native_handle_psl_slice_error, .psl_interrupt = NULL, .ack_irq = native_ack_irq, + .irq_wait = native_irq_wait, .attach_process = native_attach_process, .detach_process = native_detach_process, .support_attributes = native_support_attributes, |