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Commit 797625de authored by Christophe Lombard's avatar Christophe Lombard Committed by Michael Ellerman
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cxl: Fixes for Coherent Accelerator Interface Architecture 2.0 



A previous set of patches "cxl: Add support for Coherent Accelerator
Interface Architecture 2.0" has introduced a new support for the CAPI
cards. These patches have been tested on Simulation environment and
quite a bit of them have been tested on real hardware.

This patch brings new fixes after a series of tests carried out on new
equipment:
  - Add POWER9 definition.
  - Re-enable any masked interrupts when the AFU is not activated
    after resetting the AFU.
  - Remove the api cxl_is_psl8/9 which is no longer useful.
  - Do not dump CAPI1 registers.
  - Rewrite cxl_is_page_fault() function.
  - Do not register slb callack on P9.

Fixes: f24be42a ("cxl: Add psl9 specific code")
Signed-off-by: default avatarChristophe Lombard <clombard@linux.vnet.ibm.com>
Acked-by: default avatarFrederic Barrat <fbarrat@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 34f19ff1

drivers/misc/cxl/context.c

+3 −3
Original line number Diff line number Diff line
@@ -45,7 +45,7 @@ int cxl_context_init(struct cxl_context *ctx, struct cxl_afu *afu, bool master) 
	mutex_init(&ctx->mapping_lock);

	ctx->mapping = NULL;



	if (cxl_is_psl8(afu)) {

	if (cxl_is_power8()) {

		spin_lock_init(&ctx->sste_lock);



		/*
@@ -189,7 +189,7 @@ int cxl_context_iomap(struct cxl_context *ctx, struct vm_area_struct *vma) 
		if (start + len > ctx->afu->adapter->ps_size)

			return -EINVAL;



		if (cxl_is_psl9(ctx->afu)) {

		if (cxl_is_power9()) {

			/*

			 * Make sure there is a valid problem state

			 * area space for this AFU.
@@ -324,7 +324,7 @@ static void reclaim_ctx(struct rcu_head *rcu) 
{

	struct cxl_context *ctx = container_of(rcu, struct cxl_context, rcu);



	if (cxl_is_psl8(ctx->afu))

	if (cxl_is_power8())

		free_page((u64)ctx->sstp);

	if (ctx->ff_page)

		__free_page(ctx->ff_page);

drivers/misc/cxl/cxl.h

+5 −13
Original line number Diff line number Diff line
@@ -357,6 +357,7 @@ static const cxl_p2n_reg_t CXL_PSL_WED_An = {0x0A0}; 
#define CXL_PSL9_DSISR_An_PF_RGP  0x0000000000000090ULL  /* PTE not found (Radix Guest (parent)) 0b10010000 */

#define CXL_PSL9_DSISR_An_PF_HRH  0x0000000000000094ULL  /* PTE not found (HPT/Radix Host)       0b10010100 */

#define CXL_PSL9_DSISR_An_PF_STEG 0x000000000000009CULL  /* PTE not found (STEG VA)              0b10011100 */

#define CXL_PSL9_DSISR_An_URTCH   0x00000000000000B4ULL  /* Unsupported Radix Tree Configuration 0b10110100 */



/****** CXL_PSL_TFC_An ******************************************************/

#define CXL_PSL_TFC_An_A  (1ull << (63-28)) /* Acknowledge non-translation fault */
@@ -844,24 +845,15 @@ static inline bool cxl_is_power8(void) 


static inline bool cxl_is_power9(void)

{

	/* intermediate solution */

	if (!cxl_is_power8() &&

	   (cpu_has_feature(CPU_FTRS_POWER9) ||

	    cpu_has_feature(CPU_FTR_POWER9_DD1)))

	if (pvr_version_is(PVR_POWER9))

		return true;

	return false;

}



static inline bool cxl_is_psl8(struct cxl_afu *afu)

static inline bool cxl_is_power9_dd1(void)

{

	if (afu->adapter->caia_major == 1)

		return true;

	return false;

}



static inline bool cxl_is_psl9(struct cxl_afu *afu)

{

	if (afu->adapter->caia_major == 2)

	if ((pvr_version_is(PVR_POWER9)) &&

	    cpu_has_feature(CPU_FTR_POWER9_DD1))

		return true;

	return false;

}

drivers/misc/cxl/fault.c

+15 −8
Original line number Diff line number Diff line
@@ -187,7 +187,7 @@ static struct mm_struct *get_mem_context(struct cxl_context *ctx) 


static bool cxl_is_segment_miss(struct cxl_context *ctx, u64 dsisr)

{

	if ((cxl_is_psl8(ctx->afu)) && (dsisr & CXL_PSL_DSISR_An_DS))

	if ((cxl_is_power8() && (dsisr & CXL_PSL_DSISR_An_DS)))

		return true;



	return false;
@@ -195,15 +195,22 @@ static bool cxl_is_segment_miss(struct cxl_context *ctx, u64 dsisr) 


static bool cxl_is_page_fault(struct cxl_context *ctx, u64 dsisr)

{

	if ((cxl_is_psl8(ctx->afu)) && (dsisr & CXL_PSL_DSISR_An_DM))

	u64 crs; /* Translation Checkout Response Status */



	if ((cxl_is_power8()) && (dsisr & CXL_PSL_DSISR_An_DM))

		return true;



	if ((cxl_is_psl9(ctx->afu)) &&

	   ((dsisr & CXL_PSL9_DSISR_An_CO_MASK) &

		(CXL_PSL9_DSISR_An_PF_SLR | CXL_PSL9_DSISR_An_PF_RGC |

		 CXL_PSL9_DSISR_An_PF_RGP | CXL_PSL9_DSISR_An_PF_HRH |

		 CXL_PSL9_DSISR_An_PF_STEG)))

	if (cxl_is_power9()) {

		crs = (dsisr & CXL_PSL9_DSISR_An_CO_MASK);

		if ((crs == CXL_PSL9_DSISR_An_PF_SLR) ||

		    (crs == CXL_PSL9_DSISR_An_PF_RGC) ||

		    (crs == CXL_PSL9_DSISR_An_PF_RGP) ||

		    (crs == CXL_PSL9_DSISR_An_PF_HRH) ||

		    (crs == CXL_PSL9_DSISR_An_PF_STEG) ||

		    (crs == CXL_PSL9_DSISR_An_URTCH)) {

			return true;

		}

	}



	return false;

}

drivers/misc/cxl/main.c

+13 −4
Original line number Diff line number Diff line
@@ -329,8 +329,15 @@ static int __init init_cxl(void) 


	cxl_debugfs_init();



	if ((rc = register_cxl_calls(&cxl_calls)))

	/*

	 * we don't register the callback on P9. slb callack is only

	 * used for the PSL8 MMU and CX4.

	 */

	if (cxl_is_power8()) {

		rc = register_cxl_calls(&cxl_calls);

		if (rc)

			goto err;

	}



	if (cpu_has_feature(CPU_FTR_HVMODE)) {

		cxl_ops = &cxl_native_ops;
@@ -347,6 +354,7 @@ static int __init init_cxl(void) 


	return 0;

err1:

	if (cxl_is_power8())

		unregister_cxl_calls(&cxl_calls);

err:

	cxl_debugfs_exit();
@@ -366,6 +374,7 @@ static void exit_cxl(void) 


	cxl_debugfs_exit();

	cxl_file_exit();

	if (cxl_is_power8())

		unregister_cxl_calls(&cxl_calls);

	idr_destroy(&cxl_adapter_idr);

}

drivers/misc/cxl/native.c

+17 −12
Original line number Diff line number Diff line
@@ -105,11 +105,16 @@ static int native_afu_reset(struct cxl_afu *afu) 
			   CXL_AFU_Cntl_An_RS_MASK | CXL_AFU_Cntl_An_ES_MASK,

			   false);



	/* Re-enable any masked interrupts */

	/*

	 * Re-enable any masked interrupts when the AFU is not

	 * activated to avoid side effects after attaching a process

	 * in dedicated mode.

	 */

	if (afu->current_mode == 0) {

		serr = cxl_p1n_read(afu, CXL_PSL_SERR_An);

		serr &= ~CXL_PSL_SERR_An_IRQ_MASKS;

		cxl_p1n_write(afu, CXL_PSL_SERR_An, serr);



	}



	return rc;

}
@@ -139,9 +144,9 @@ int cxl_psl_purge(struct cxl_afu *afu) 


	pr_devel("PSL purge request\n");



	if (cxl_is_psl8(afu))

	if (cxl_is_power8())

		trans_fault = CXL_PSL_DSISR_TRANS;

	if (cxl_is_psl9(afu))

	if (cxl_is_power9())

		trans_fault = CXL_PSL9_DSISR_An_TF;



	if (!cxl_ops->link_ok(afu->adapter, afu)) {
@@ -603,7 +608,7 @@ static u64 calculate_sr(struct cxl_context *ctx) 
		if (!test_tsk_thread_flag(current, TIF_32BIT))

			sr |= CXL_PSL_SR_An_SF;

	}

	if (cxl_is_psl9(ctx->afu)) {

	if (cxl_is_power9()) {

		if (radix_enabled())

			sr |= CXL_PSL_SR_An_XLAT_ror;

		else
@@ -1117,10 +1122,10 @@ static irqreturn_t native_handle_psl_slice_error(struct cxl_context *ctx, 


static bool cxl_is_translation_fault(struct cxl_afu *afu, u64 dsisr)

{

	if ((cxl_is_psl8(afu)) && (dsisr & CXL_PSL_DSISR_TRANS))

	if ((cxl_is_power8()) && (dsisr & CXL_PSL_DSISR_TRANS))

		return true;



	if ((cxl_is_psl9(afu)) && (dsisr & CXL_PSL9_DSISR_An_TF))

	if ((cxl_is_power9()) && (dsisr & CXL_PSL9_DSISR_An_TF))

		return true;



	return false;
@@ -1194,10 +1199,10 @@ static void native_irq_wait(struct cxl_context *ctx) 
		if (ph != ctx->pe)

			return;

		dsisr = cxl_p2n_read(ctx->afu, CXL_PSL_DSISR_An);

		if (cxl_is_psl8(ctx->afu) &&

		if (cxl_is_power8() &&

		   ((dsisr & CXL_PSL_DSISR_PENDING) == 0))

			return;

		if (cxl_is_psl9(ctx->afu) &&

		if (cxl_is_power9() &&

		   ((dsisr & CXL_PSL9_DSISR_PENDING) == 0))

			return;

		/*