Merge tag 'powerpc-3.19-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux

Pull powerpc updates from Michael Ellerman:
 "Some nice cleanups like removing bootmem, and removal of
  __get_cpu_var().

  There is one patch to mm/gup.c.  This is the generic GUP
  implementation, but is only used by us and arm(64).  We have an ack
  from Steve Capper, and although we didn't get an ack from Andrew he
  told us to take the patch through the powerpc tree.

  There's one cxl patch.  This is in drivers/misc, but Greg said he was
  happy for us to manage fixes for it.

  There is an infrastructure patch to support an IPMI driver for OPAL.

  There is also an RTC driver for OPAL.  We weren't able to get any
  response from the RTC maintainer, Alessandro Zummo, so in the end we
  just merged the driver.

  The usual batch of Freescale updates from Scott"

* tag 'powerpc-3.19-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux: (101 commits)
  powerpc/powernv: Return to cpu offline loop when finished in KVM guest
  powerpc/book3s: Fix partial invalidation of TLBs in MCE code.
  powerpc/mm: don't do tlbie for updatepp request with NO HPTE fault
  powerpc/xmon: Cleanup the breakpoint flags
  powerpc/xmon: Enable HW instruction breakpoint on POWER8
  powerpc/mm/thp: Use tlbiel if possible
  powerpc/mm/thp: Remove code duplication
  powerpc/mm/hugetlb: Sanity check gigantic hugepage count
  powerpc/oprofile: Disable pagefaults during user stack read
  powerpc/mm: Check for matching hpte without taking hpte lock
  powerpc: Drop useless warning in eeh_init()
  powerpc/powernv: Cleanup unused MCE definitions/declarations.
  powerpc/eeh: Dump PHB diag-data early
  powerpc/eeh: Recover EEH error on ownership change for BCM5719
  powerpc/eeh: Set EEH_PE_RESET on PE reset
  powerpc/eeh: Refactor eeh_reset_pe()
  powerpc: Remove more traces of bootmem
  powerpc/pseries: Initialise nvram_pstore_info's buf_lock
  cxl: Name interrupts in /proc/interrupt
  cxl: Return error to PSL if IRQ demultiplexing fails & print clearer warning
  ...

1 files changed, 117 insertions, 27 deletions

diff --git a/drivers/misc/cxl/irq.c b/drivers/misc/cxl/irq.c
index 336020c8e1af..c294925f73ee 100644
--- a/drivers/misc/cxl/irq.c
+++ b/drivers/misc/cxl/irq.c
@@ -92,20 +92,13 @@ static irqreturn_t schedule_cxl_fault(struct cxl_context *ctx, u64 dsisr, u64 da
         return IRQ_HANDLED;
 }
 
-static irqreturn_t cxl_irq(int irq, void *data)
+static irqreturn_t cxl_irq(int irq, void *data, struct cxl_irq_info *irq_info)
 {
         struct cxl_context *ctx = data;
-        struct cxl_irq_info irq_info;
         u64 dsisr, dar;
-        int result;
-
-        if ((result = cxl_get_irq(ctx, &irq_info))) {
-                WARN(1, "Unable to get CXL IRQ Info: %i\n", result);
-                return IRQ_HANDLED;
-        }
 
-        dsisr = irq_info.dsisr;
-        dar = irq_info.dar;
+        dsisr = irq_info->dsisr;
+        dar = irq_info->dar;
 
         pr_devel("CXL interrupt %i for afu pe: %i DSISR: %#llx DAR: %#llx\n", irq, ctx->pe, dsisr, dar);
 
@@ -149,9 +142,9 @@ static irqreturn_t cxl_irq(int irq, void *data)
         if (dsisr & CXL_PSL_DSISR_An_UR)
                 pr_devel("CXL interrupt: AURP PTE not found\n");
         if (dsisr & CXL_PSL_DSISR_An_PE)
-                return handle_psl_slice_error(ctx, dsisr, irq_info.errstat);
+                return handle_psl_slice_error(ctx, dsisr, irq_info->errstat);
         if (dsisr & CXL_PSL_DSISR_An_AE) {
-                pr_devel("CXL interrupt: AFU Error %.llx\n", irq_info.afu_err);
+                pr_devel("CXL interrupt: AFU Error %.llx\n", irq_info->afu_err);
 
                 if (ctx->pending_afu_err) {
                         /*
@@ -163,10 +156,10 @@ static irqreturn_t cxl_irq(int irq, void *data)
                          */
                         dev_err_ratelimited(&ctx->afu->dev, "CXL AFU Error "
                                             "undelivered to pe %i: %.llx\n",
-                                            ctx->pe, irq_info.afu_err);
+                                            ctx->pe, irq_info->afu_err);
                 } else {
                         spin_lock(&ctx->lock);
-                        ctx->afu_err = irq_info.afu_err;
+                        ctx->afu_err = irq_info->afu_err;
                         ctx->pending_afu_err = 1;
                         spin_unlock(&ctx->lock);
 
@@ -182,24 +175,43 @@ static irqreturn_t cxl_irq(int irq, void *data)
         return IRQ_HANDLED;
 }
 
+static irqreturn_t fail_psl_irq(struct cxl_afu *afu, struct cxl_irq_info *irq_info)
+{
+        if (irq_info->dsisr & CXL_PSL_DSISR_TRANS)
+                cxl_p2n_write(afu, CXL_PSL_TFC_An, CXL_PSL_TFC_An_AE);
+        else
+                cxl_p2n_write(afu, CXL_PSL_TFC_An, CXL_PSL_TFC_An_A);
+
+        return IRQ_HANDLED;
+}
+
 static irqreturn_t cxl_irq_multiplexed(int irq, void *data)
 {
         struct cxl_afu *afu = data;
         struct cxl_context *ctx;
+        struct cxl_irq_info irq_info;
         int ph = cxl_p2n_read(afu, CXL_PSL_PEHandle_An) & 0xffff;
         int ret;
 
+        if ((ret = cxl_get_irq(afu, &irq_info))) {
+                WARN(1, "Unable to get CXL IRQ Info: %i\n", ret);
+                return fail_psl_irq(afu, &irq_info);
+        }
+
         rcu_read_lock();
         ctx = idr_find(&afu->contexts_idr, ph);
         if (ctx) {
-                ret = cxl_irq(irq, ctx);
+                ret = cxl_irq(irq, ctx, &irq_info);
                 rcu_read_unlock();
                 return ret;
         }
         rcu_read_unlock();
 
-        WARN(1, "Unable to demultiplex CXL PSL IRQ\n");
-        return IRQ_HANDLED;
+        WARN(1, "Unable to demultiplex CXL PSL IRQ for PE %i DSISR %.16llx DAR"
+                " %.16llx\n(Possible AFU HW issue - was a term/remove acked"
+                " with outstanding transactions?)\n", ph, irq_info.dsisr,
+                irq_info.dar);
+        return fail_psl_irq(afu, &irq_info);
 }
 
 static irqreturn_t cxl_irq_afu(int irq, void *data)
@@ -243,7 +255,7 @@ static irqreturn_t cxl_irq_afu(int irq, void *data)
 }
 
 unsigned int cxl_map_irq(struct cxl *adapter, irq_hw_number_t hwirq,
-                         irq_handler_t handler, void *cookie)
+                         irq_handler_t handler, void *cookie, const char *name)
 {
         unsigned int virq;
         int result;
@@ -259,7 +271,7 @@ unsigned int cxl_map_irq(struct cxl *adapter, irq_hw_number_t hwirq,
 
         pr_devel("hwirq %#lx mapped to virq %u\n", hwirq, virq);
 
-        result = request_irq(virq, handler, 0, "cxl", cookie);
+        result = request_irq(virq, handler, 0, name, cookie);
         if (result) {
                 dev_warn(&adapter->dev, "cxl_map_irq: request_irq failed: %i\n", result);
                 return 0;
@@ -278,14 +290,15 @@ static int cxl_register_one_irq(struct cxl *adapter,
                                 irq_handler_t handler,
                                 void *cookie,
                                 irq_hw_number_t *dest_hwirq,
-                                unsigned int *dest_virq)
+                                unsigned int *dest_virq,
+                                const char *name)
 {
         int hwirq, virq;
 
         if ((hwirq = cxl_alloc_one_irq(adapter)) < 0)
                 return hwirq;
 
-        if (!(virq = cxl_map_irq(adapter, hwirq, handler, cookie)))
+        if (!(virq = cxl_map_irq(adapter, hwirq, handler, cookie, name)))
                 goto err;
 
         *dest_hwirq = hwirq;
@@ -302,10 +315,19 @@ int cxl_register_psl_err_irq(struct cxl *adapter)
 {
         int rc;
 
+        adapter->irq_name = kasprintf(GFP_KERNEL, "cxl-%s-err",
+                                      dev_name(&adapter->dev));
+        if (!adapter->irq_name)
+                return -ENOMEM;
+
         if ((rc = cxl_register_one_irq(adapter, cxl_irq_err, adapter,
                                        &adapter->err_hwirq,
-                                       &adapter->err_virq)))
+                                       &adapter->err_virq,
+                                       adapter->irq_name))) {
+                kfree(adapter->irq_name);
+                adapter->irq_name = NULL;
                 return rc;
+        }
 
         cxl_p1_write(adapter, CXL_PSL_ErrIVTE, adapter->err_hwirq & 0xffff);
 
@@ -317,6 +339,7 @@ void cxl_release_psl_err_irq(struct cxl *adapter)
         cxl_p1_write(adapter, CXL_PSL_ErrIVTE, 0x0000000000000000);
         cxl_unmap_irq(adapter->err_virq, adapter);
         cxl_release_one_irq(adapter, adapter->err_hwirq);
+        kfree(adapter->irq_name);
 }
 
 int cxl_register_serr_irq(struct cxl_afu *afu)
@@ -324,10 +347,18 @@ int cxl_register_serr_irq(struct cxl_afu *afu)
         u64 serr;
         int rc;
 
+        afu->err_irq_name = kasprintf(GFP_KERNEL, "cxl-%s-err",
+                                      dev_name(&afu->dev));
+        if (!afu->err_irq_name)
+                return -ENOMEM;
+
         if ((rc = cxl_register_one_irq(afu->adapter, cxl_slice_irq_err, afu,
                                        &afu->serr_hwirq,
-                                       &afu->serr_virq)))
+                                       &afu->serr_virq, afu->err_irq_name))) {
+                kfree(afu->err_irq_name);
+                afu->err_irq_name = NULL;
                 return rc;
+        }
 
         serr = cxl_p1n_read(afu, CXL_PSL_SERR_An);
         serr = (serr & 0x00ffffffffff0000ULL) | (afu->serr_hwirq & 0xffff);
@@ -341,24 +372,50 @@ void cxl_release_serr_irq(struct cxl_afu *afu)
         cxl_p1n_write(afu, CXL_PSL_SERR_An, 0x0000000000000000);
         cxl_unmap_irq(afu->serr_virq, afu);
         cxl_release_one_irq(afu->adapter, afu->serr_hwirq);
+        kfree(afu->err_irq_name);
 }
 
 int cxl_register_psl_irq(struct cxl_afu *afu)
 {
-        return cxl_register_one_irq(afu->adapter, cxl_irq_multiplexed, afu,
-                        &afu->psl_hwirq, &afu->psl_virq);
+        int rc;
+
+        afu->psl_irq_name = kasprintf(GFP_KERNEL, "cxl-%s",
+                                      dev_name(&afu->dev));
+        if (!afu->psl_irq_name)
+                return -ENOMEM;
+
+        if ((rc = cxl_register_one_irq(afu->adapter, cxl_irq_multiplexed, afu,
+                                    &afu->psl_hwirq, &afu->psl_virq,
+                                    afu->psl_irq_name))) {
+                kfree(afu->psl_irq_name);
+                afu->psl_irq_name = NULL;
+        }
+        return rc;
 }
 
 void cxl_release_psl_irq(struct cxl_afu *afu)
 {
         cxl_unmap_irq(afu->psl_virq, afu);
         cxl_release_one_irq(afu->adapter, afu->psl_hwirq);
+        kfree(afu->psl_irq_name);
+}
+
+void afu_irq_name_free(struct cxl_context *ctx)
+{
+        struct cxl_irq_name *irq_name, *tmp;
+
+        list_for_each_entry_safe(irq_name, tmp, &ctx->irq_names, list) {
+                kfree(irq_name->name);
+                list_del(&irq_name->list);
+                kfree(irq_name);
+        }
 }
 
 int afu_register_irqs(struct cxl_context *ctx, u32 count)
 {
         irq_hw_number_t hwirq;
-        int rc, r, i;
+        int rc, r, i, j = 1;
+        struct cxl_irq_name *irq_name;
 
         if ((rc = cxl_alloc_irq_ranges(&ctx->irqs, ctx->afu->adapter, count)))
                 return rc;
@@ -372,15 +429,47 @@ int afu_register_irqs(struct cxl_context *ctx, u32 count)
                                   sizeof(*ctx->irq_bitmap), GFP_KERNEL);
         if (!ctx->irq_bitmap)
                 return -ENOMEM;
+
+        /*
+         * Allocate names first.  If any fail, bail out before allocating
+         * actual hardware IRQs.
+         */
+        INIT_LIST_HEAD(&ctx->irq_names);
+        for (r = 1; r < CXL_IRQ_RANGES; r++) {
+                for (i = 0; i < ctx->irqs.range[r]; hwirq++, i++) {
+                        irq_name = kmalloc(sizeof(struct cxl_irq_name),
+                                           GFP_KERNEL);
+                        if (!irq_name)
+                                goto out;
+                        irq_name->name = kasprintf(GFP_KERNEL, "cxl-%s-pe%i-%i",
+                                                   dev_name(&ctx->afu->dev),
+                                                   ctx->pe, j);
+                        if (!irq_name->name) {
+                                kfree(irq_name);
+                                goto out;
+                        }
+                        /* Add to tail so next look get the correct order */
+                        list_add_tail(&irq_name->list, &ctx->irq_names);
+                        j++;
+                }
+        }
+
+        /* We've allocated all memory now, so let's do the irq allocations */
+        irq_name = list_first_entry(&ctx->irq_names, struct cxl_irq_name, list);
         for (r = 1; r < CXL_IRQ_RANGES; r++) {
                 hwirq = ctx->irqs.offset[r];
                 for (i = 0; i < ctx->irqs.range[r]; hwirq++, i++) {
                         cxl_map_irq(ctx->afu->adapter, hwirq,
-                                     cxl_irq_afu, ctx);
+                                    cxl_irq_afu, ctx, irq_name->name);
+                        irq_name = list_next_entry(irq_name, list);
                 }
         }
 
         return 0;
+
+out:
+        afu_irq_name_free(ctx);
+        return -ENOMEM;
 }
 
 void afu_release_irqs(struct cxl_context *ctx)
@@ -398,5 +487,6 @@ void afu_release_irqs(struct cxl_context *ctx)
                 }
         }
 
+        afu_irq_name_free(ctx);
         cxl_release_irq_ranges(&ctx->irqs, ctx->afu->adapter);
 }