Merge tag 'powerpc-4.7-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc updates from Michael Ellerman:
 "Highlights:
   - Support for Power ISA 3.0 (Power9) Radix Tree MMU from Aneesh Kumar K.V
   - Live patching support for ppc64le (also merged via livepatching.git)

  Various cleanups & minor fixes from:
   - Aaro Koskinen, Alexey Kardashevskiy, Andrew Donnellan, Aneesh Kumar K.V,
     Chris Smart, Daniel Axtens, Frederic Barrat, Gavin Shan, Ian Munsie,
     Lennart Sorensen, Madhavan Srinivasan, Mahesh Salgaonkar, Markus Elfring,
     Michael Ellerman, Oliver O'Halloran, Paul Gortmaker, Paul Mackerras,
     Rashmica Gupta, Russell Currey, Suraj Jitindar Singh, Thiago Jung
     Bauermann, Valentin Rothberg, Vipin K Parashar.

  General:
   - Update LMB associativity index during DLPAR add/remove from Nathan
     Fontenot
   - Fix branching to OOL handlers in relocatable kernel from Hari Bathini
   - Add support for userspace Power9 copy/paste from Chris Smart
   - Always use STRICT_MM_TYPECHECKS from Michael Ellerman
   - Add mask of possible MMU features from Michael Ellerman

  PCI:
   - Enable pass through of NVLink to guests from Alexey Kardashevskiy
   - Cleanups in preparation for powernv PCI hotplug from Gavin Shan
   - Don't report error in eeh_pe_reset_and_recover() from Gavin Shan
   - Restore initial state in eeh_pe_reset_and_recover() from Gavin Shan
   - Revert "powerpc/eeh: Fix crash in eeh_add_device_early() on Cell"
     from Guilherme G Piccoli
   - Remove the dependency on EEH struct in DDW mechanism from Guilherme
     G Piccoli

  selftests:
   - Test cp_abort during context switch from Chris Smart
   - Add several tests for transactional memory support from Rashmica
     Gupta

  perf:
   - Add support for sampling interrupt register state from Anju T
   - Add support for unwinding perf-stackdump from Chandan Kumar

  cxl:
   - Configure the PSL for two CAPI ports on POWER8NVL from Philippe
     Bergheaud
   - Allow initialization on timebase sync failures from Frederic Barrat
   - Increase timeout for detection of AFU mmio hang from Frederic
     Barrat
   - Handle num_of_processes larger than can fit in the SPA from Ian
     Munsie
   - Ensure PSL interrupt is configured for contexts with no AFU IRQs
     from Ian Munsie
   - Add kernel API to allow a context to operate with relocate disabled
     from Ian Munsie
   - Check periodically the coherent platform function's state from
     Christophe Lombard

  Freescale:
   - Updates from Scott: "Contains 86xx fixes, minor device tree fixes,
     an erratum workaround, and a kconfig dependency fix."

* tag 'powerpc-4.7-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (192 commits)
  powerpc/86xx: Fix PCI interrupt map definition
  powerpc/86xx: Move pci1 definition to the include file
  powerpc/fsl: Fix build of the dtb embedded kernel images
  powerpc/fsl: Fix rcpm compatible string
  powerpc/fsl: Remove FSL_SOC dependency from FSL_LBC
  powerpc/fsl-pci: Add a workaround for PCI 5 errata
  powerpc/fsl: Fix SPI compatible on t208xrdb and t1040rdb
  powerpc/powernv/npu: Add PE to PHB's list
  powerpc/powernv: Fix insufficient memory allocation
  powerpc/iommu: Remove the dependency on EEH struct in DDW mechanism
  Revert "powerpc/eeh: Fix crash in eeh_add_device_early() on Cell"
  powerpc/eeh: Drop unnecessary label in eeh_pe_change_owner()
  powerpc/eeh: Ignore handlers in eeh_pe_reset_and_recover()
  powerpc/eeh: Restore initial state in eeh_pe_reset_and_recover()
  powerpc/eeh: Don't report error in eeh_pe_reset_and_recover()
  Revert "powerpc/powernv: Exclude root bus in pnv_pci_reset_secondary_bus()"
  powerpc/powernv/npu: Enable NVLink pass through
  powerpc/powernv/npu: Rework TCE Kill handling
  powerpc/powernv/npu: Add set/unset window helpers
  powerpc/powernv/ioda2: Export debug helper pe_level_printk()
  ...

1 files changed, 51 insertions, 27 deletions

diff --git a/drivers/misc/cxl/guest.c b/drivers/misc/cxl/guest.c
index 8213372de2b7..bc8d0b9870eb 100644
--- a/drivers/misc/cxl/guest.c
+++ b/drivers/misc/cxl/guest.c
@@ -178,6 +178,9 @@ static int afu_read_error_state(struct cxl_afu *afu, int *state_out)
 	u64 state;
 	int rc = 0;
 
+	if (!afu)
+		return -EIO;
+
 	rc = cxl_h_read_error_state(afu->guest->handle, &state);
 	if (!rc) {
 		WARN_ON(state != H_STATE_NORMAL &&
@@ -552,6 +555,17 @@ static int attach_afu_directed(struct cxl_context *ctx, u64 wed, u64 amr)
 
 	elem->common.sstp0  = cpu_to_be64(ctx->sstp0);
 	elem->common.sstp1  = cpu_to_be64(ctx->sstp1);
+
+	/*
+	 * Ensure we have at least one interrupt allocated to take faults for
+	 * kernel contexts that may not have allocated any AFU IRQs at all:
+	 */
+	if (ctx->irqs.range[0] == 0) {
+		rc = afu_register_irqs(ctx, 0);
+		if (rc)
+			goto out_free;
+	}
+
 	for (r = 0; r < CXL_IRQ_RANGES; r++) {
 		for (i = 0; i < ctx->irqs.range[r]; i++) {
 			if (r == 0 && i == 0) {
@@ -597,6 +611,7 @@ static int attach_afu_directed(struct cxl_context *ctx, u64 wed, u64 amr)
 		enable_afu_irqs(ctx);
 	}
 
+out_free:
 	free_page((u64)elem);
 	return rc;
 }
@@ -605,6 +620,9 @@ static int guest_attach_process(struct cxl_context *ctx, bool kernel, u64 wed, u
 {
 	pr_devel("in %s\n", __func__);
 
+	if (ctx->real_mode)
+		return -EPERM;
+
 	ctx->kernel = kernel;
 	if (ctx->afu->current_mode == CXL_MODE_DIRECTED)
 		return attach_afu_directed(ctx, wed, amr);
@@ -818,7 +836,6 @@ static int afu_update_state(struct cxl_afu *afu)
 	switch (cur_state) {
 	case H_STATE_NORMAL:
 		afu->guest->previous_state = cur_state;
-		rc = 1;
 		break;
 
 	case H_STATE_DISABLE:
@@ -834,7 +851,6 @@ static int afu_update_state(struct cxl_afu *afu)
 			pci_error_handlers(afu, CXL_SLOT_RESET_EVENT,
 					pci_channel_io_normal);
 			pci_error_handlers(afu, CXL_RESUME_EVENT, 0);
-			rc = 1;
 		}
 		afu->guest->previous_state = 0;
 		break;
@@ -859,39 +875,30 @@ static int afu_update_state(struct cxl_afu *afu)
 	return rc;
 }
 
-static int afu_do_recovery(struct cxl_afu *afu)
+static void afu_handle_errstate(struct work_struct *work)
 {
-	int rc;
+	struct cxl_afu_guest *afu_guest =
+		container_of(to_delayed_work(work), struct cxl_afu_guest, work_err);
 
-	/* many threads can arrive here, in case of detach_all for example.
-	 * Only one needs to drive the recovery
-	 */
-	if (mutex_trylock(&afu->guest->recovery_lock)) {
-		rc = afu_update_state(afu);
-		mutex_unlock(&afu->guest->recovery_lock);
-		return rc;
-	}
-	return 0;
+	if (!afu_update_state(afu_guest->parent) &&
+	    afu_guest->previous_state == H_STATE_PERM_UNAVAILABLE)
+		return;
+
+	if (afu_guest->handle_err == true)
+		schedule_delayed_work(&afu_guest->work_err,
+				      msecs_to_jiffies(3000));
 }
 
 static bool guest_link_ok(struct cxl *cxl, struct cxl_afu *afu)
 {
 	int state;
 
-	if (afu) {
-		if (afu_read_error_state(afu, &state) ||
-			state != H_STATE_NORMAL) {
-			if (afu_do_recovery(afu) > 0) {
-				/* check again in case we've just fixed it */
-				if (!afu_read_error_state(afu, &state) &&
-					state == H_STATE_NORMAL)
-					return true;
-			}
-			return false;
-		}
+	if (afu && (!afu_read_error_state(afu, &state))) {
+		if (state == H_STATE_NORMAL)
+			return true;
 	}
 
-	return true;
+	return false;
 }
 
 static int afu_properties_look_ok(struct cxl_afu *afu)
@@ -929,8 +936,6 @@ int cxl_guest_init_afu(struct cxl *adapter, int slice, struct device_node *afu_n
 		return -ENOMEM;
 	}
 
-	mutex_init(&afu->guest->recovery_lock);
-
 	if ((rc = dev_set_name(&afu->dev, "afu%i.%i",
 					  adapter->adapter_num,
 					  slice)))
@@ -986,6 +991,15 @@ int cxl_guest_init_afu(struct cxl *adapter, int slice, struct device_node *afu_n
 
 	afu->enabled = true;
 
+	/*
+	 * wake up the cpu periodically to check the state
+	 * of the AFU using "afu" stored in the guest structure.
+	 */
+	afu->guest->parent = afu;
+	afu->guest->handle_err = true;
+	INIT_DELAYED_WORK(&afu->guest->work_err, afu_handle_errstate);
+	schedule_delayed_work(&afu->guest->work_err, msecs_to_jiffies(1000));
+
 	if ((rc = cxl_pci_vphb_add(afu)))
 		dev_info(&afu->dev, "Can't register vPHB\n");
 
@@ -1014,6 +1028,10 @@ void cxl_guest_remove_afu(struct cxl_afu *afu)
 	if (!afu)
 		return;
 
+	/* flush and stop pending job */
+	afu->guest->handle_err = false;
+	flush_delayed_work(&afu->guest->work_err);
+
 	cxl_pci_vphb_remove(afu);
 	cxl_sysfs_afu_remove(afu);
 
@@ -1101,6 +1119,12 @@ struct cxl *cxl_guest_init_adapter(struct device_node *np, struct platform_devic
 	adapter->dev.release = release_adapter;
 	dev_set_drvdata(&pdev->dev, adapter);
 
+	/*
+	 * Hypervisor controls PSL timebase initialization (p1 register).
+	 * On FW840, PSL is initialized.
+	 */
+	adapter->psl_timebase_synced = true;
+
 	if ((rc = cxl_of_read_adapter_handle(adapter, np)))
 		goto err1;