Merge tag 'powerpc-4.15-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc...

Pull powerpc fixes from Michael Ellerman:
 "Two fixes for nasty kexec/kdump crashes in certain configurations.

  A couple of minor fixes for the new TIDR code.

  A fix for an oops in a CXL error handling path.

  Thanks to: Andrew Donnellan, Christophe Lombard, David Gibson, Mahesh
  Salgaonkar, Vaibhav Jain"

* tag 'powerpc-4.15-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc: Do not assign thread.tidr if already assigned
  powerpc: Avoid signed to unsigned conversion in set_thread_tidr()
  powerpc/kexec: Fix kexec/kdump in P9 guest kernels
  powerpc/powernv: Fix kexec crashes caused by tlbie tracing
  cxl: Check if vphb exists before iterating over AFU devices

diff --git a/arch/powerpc/kernel/misc_64.S b/arch/powerpc/kernel/misc_64.S
index 8ac0bd2..3280953 100644 (file)
--- a/arch/powerpc/kernel/misc_64.S
+++ b/arch/powerpc/kernel/misc_64.S
@@ -623,7 +623,9 @@ BEGIN_FTR_SECTION
         * NOTE, we rely on r0 being 0 from above.
         */
        mtspr   SPRN_IAMR,r0
+BEGIN_FTR_SECTION_NESTED(42)
        mtspr   SPRN_AMOR,r0
+END_FTR_SECTION_NESTED_IFSET(CPU_FTR_HVMODE, 42)
 END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
 
        /* save regs for local vars on new stack.

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index bfdd783..5acb5a1 100644 (file)
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -1569,16 +1569,22 @@ void arch_release_task_struct(struct task_struct *t)
  */
 int set_thread_tidr(struct task_struct *t)
 {
+       int rc;
+
        if (!cpu_has_feature(CPU_FTR_ARCH_300))
                return -EINVAL;
 
        if (t != current)
                return -EINVAL;
 
-       t->thread.tidr = assign_thread_tidr();
-       if (t->thread.tidr < 0)
-               return t->thread.tidr;
+       if (t->thread.tidr)
+               return 0;
+
+       rc = assign_thread_tidr();
+       if (rc < 0)
+               return rc;
 
+       t->thread.tidr = rc;
        mtspr(SPRN_TIDR, t->thread.tidr);
 
        return 0;

diff --git a/arch/powerpc/mm/hash_native_64.c b/arch/powerpc/mm/hash_native_64.c
index 3848af1..640cf56 100644 (file)
--- a/arch/powerpc/mm/hash_native_64.c
+++ b/arch/powerpc/mm/hash_native_64.c
@@ -47,7 +47,8 @@
 
 DEFINE_RAW_SPINLOCK(native_tlbie_lock);
 
-static inline void __tlbie(unsigned long vpn, int psize, int apsize, int ssize)
+static inline unsigned long  ___tlbie(unsigned long vpn, int psize,
+                                               int apsize, int ssize)
 {
        unsigned long va;
        unsigned int penc;
@@ -100,7 +101,15 @@ static inline void __tlbie(unsigned long vpn, int psize, int apsize, int ssize)
                             : "memory");
                break;
        }
-       trace_tlbie(0, 0, va, 0, 0, 0, 0);
+       return va;
+}
+
+static inline void __tlbie(unsigned long vpn, int psize, int apsize, int ssize)
+{
+       unsigned long rb;
+
+       rb = ___tlbie(vpn, psize, apsize, ssize);
+       trace_tlbie(0, 0, rb, 0, 0, 0, 0);
 }
 
 static inline void __tlbiel(unsigned long vpn, int psize, int apsize, int ssize)
@@ -652,7 +661,7 @@ static void native_hpte_clear(void)
                if (hpte_v & HPTE_V_VALID) {
                        hpte_decode(hptep, slot, &psize, &apsize, &ssize, &vpn);
                        hptep->v = 0;
-                       __tlbie(vpn, psize, apsize, ssize);
+                       ___tlbie(vpn, psize, apsize, ssize);
                }
        }
 

diff --git a/drivers/misc/cxl/pci.c b/drivers/misc/cxl/pci.c
index bb7fd3f..19969ee 100644 (file)
--- a/drivers/misc/cxl/pci.c
+++ b/drivers/misc/cxl/pci.c
@@ -2083,6 +2083,9 @@ static pci_ers_result_t cxl_vphb_error_detected(struct cxl_afu *afu,
        /* There should only be one entry, but go through the list
         * anyway
         */
+       if (afu->phb == NULL)
+               return result;
+
        list_for_each_entry(afu_dev, &afu->phb->bus->devices, bus_list) {
                if (!afu_dev->driver)
                        continue;
@@ -2124,8 +2127,7 @@ static pci_ers_result_t cxl_pci_error_detected(struct pci_dev *pdev,
                         * Tell the AFU drivers; but we don't care what they
                         * say, we're going away.
                         */
-                       if (afu->phb != NULL)
-                               cxl_vphb_error_detected(afu, state);
+                       cxl_vphb_error_detected(afu, state);
                }
                return PCI_ERS_RESULT_DISCONNECT;
        }
@@ -2265,6 +2267,9 @@ static pci_ers_result_t cxl_pci_slot_reset(struct pci_dev *pdev)
                if (cxl_afu_select_best_mode(afu))
                        goto err;
 
+               if (afu->phb == NULL)
+                       continue;
+
                list_for_each_entry(afu_dev, &afu->phb->bus->devices, bus_list) {
                        /* Reset the device context.
                         * TODO: make this less disruptive
@@ -2327,6 +2332,9 @@ static void cxl_pci_resume(struct pci_dev *pdev)
        for (i = 0; i < adapter->slices; i++) {
                afu = adapter->afu[i];
 
+               if (afu->phb == NULL)
+                       continue;
+
                list_for_each_entry(afu_dev, &afu->phb->bus->devices, bus_list) {
                        if (afu_dev->driver && afu_dev->driver->err_handler &&
                            afu_dev->driver->err_handler->resume)