Merge tag 's390-5.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull s390 updates from Vasily Gorbik:

 - Add support for ftrace with direct call and ftrace direct call
   samples.

 - Add support for kernel command lines longer than current 896 bytes
   and make its length configurable.

 - Add support for BEAR enhancement facility to improve last breaking
   event instruction tracking.

 - Add kprobes sanity checks and testcases to prevent kprobe in the mid
   of an instruction.

 - Allow concurrent access to /dev/hwc for the CPUMF users.

 - Various ftrace / jump label improvements.

 - Convert unwinder tests to KUnit.

 - Add s390_iommu_aperture kernel parameter to tweak the limits on
   concurrently usable DMA mappings.

 - Add ap.useirq AP module option which can be used to disable interrupt
   use.

 - Add add_disk() error handling support to block device drivers.

 - Drop arch specific and use generic implementation of strlcpy and
   strrchr.

 - Several __pa/__va usages fixes.

 - Various cio, crypto, pci, kernel doc and other small fixes and
   improvements all over the code.

[ Merge fixup as per https://lore.kernel.org/all/YXAqZ%2FEszRisunQw@osiris/ ]

* tag 's390-5.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (63 commits)
  s390: make command line configurable
  s390: support command lines longer than 896 bytes
  s390/kexec_file: move kernel image size check
  s390/pci: add s390_iommu_aperture kernel parameter
  s390/spinlock: remove incorrect kernel doc indicator
  s390/string: use generic strlcpy
  s390/string: use generic strrchr
  s390/ap: function rework based on compiler warning
  s390/cio: make ccw_device_dma_* more robust
  s390/vfio-ap: s390/crypto: fix all kernel-doc warnings
  s390/hmcdrv: fix kernel doc comments
  s390/ap: new module option ap.useirq
  s390/cpumf: Allow multiple processes to access /dev/hwc
  s390/bitops: return true/false (not 1/0) from bool functions
  s390: add support for BEAR enhancement facility
  s390: introduce nospec_uses_trampoline()
  s390: rename last_break to pgm_last_break
  s390/ptrace: add last_break member to pt_regs
  s390/sclp: sort out physical vs virtual pointers usage
  s390/setup: convert start and end initrd pointers to virtual
  ...

3 files changed, 35 insertions, 2 deletions

diff --git a/arch/s390/pci/pci_dma.c b/arch/s390/pci/pci_dma.c
index 93223bd110c3..1f4540d6bd2d 100644
--- a/arch/s390/pci/pci_dma.c
+++ b/arch/s390/pci/pci_dma.c
@@ -18,6 +18,8 @@
 static struct kmem_cache *dma_region_table_cache;
 static struct kmem_cache *dma_page_table_cache;
 static int s390_iommu_strict;
+static u64 s390_iommu_aperture;
+static u32 s390_iommu_aperture_factor = 1;
 
 static int zpci_refresh_global(struct zpci_dev *zdev)
 {
@@ -565,15 +567,19 @@ int zpci_dma_init_device(struct zpci_dev *zdev)
 
 	/*
 	 * Restrict the iommu bitmap size to the minimum of the following:
-	 * - main memory size
+	 * - s390_iommu_aperture which defaults to high_memory
 	 * - 3-level pagetable address limit minus start_dma offset
 	 * - DMA address range allowed by the hardware (clp query pci fn)
 	 *
 	 * Also set zdev->end_dma to the actual end address of the usable
 	 * range, instead of the theoretical maximum as reported by hardware.
+	 *
+	 * This limits the number of concurrently usable DMA mappings since
+	 * for each DMA mapped memory address we need a DMA address including
+	 * extra DMA addresses for multiple mappings of the same memory address.
 	 */
 	zdev->start_dma = PAGE_ALIGN(zdev->start_dma);
-	zdev->iommu_size = min3((u64) high_memory,
+	zdev->iommu_size = min3(s390_iommu_aperture,
 				ZPCI_TABLE_SIZE_RT - zdev->start_dma,
 				zdev->end_dma - zdev->start_dma + 1);
 	zdev->end_dma = zdev->start_dma + zdev->iommu_size - 1;
@@ -660,6 +666,12 @@ static int __init dma_alloc_cpu_table_caches(void)
 
 int __init zpci_dma_init(void)
 {
+	s390_iommu_aperture = (u64)high_memory;
+	if (!s390_iommu_aperture_factor)
+		s390_iommu_aperture = ULONG_MAX;
+	else
+		s390_iommu_aperture *= s390_iommu_aperture_factor;
+
 	return dma_alloc_cpu_table_caches();
 }
 
@@ -692,3 +704,12 @@ static int __init s390_iommu_setup(char *str)
 }
 
 __setup("s390_iommu=", s390_iommu_setup);
+
+static int __init s390_iommu_aperture_setup(char *str)
+{
+	if (kstrtou32(str, 10, &s390_iommu_aperture_factor))
+		s390_iommu_aperture_factor = 1;
+	return 1;
+}
+
+__setup("s390_iommu_aperture=", s390_iommu_aperture_setup);
diff --git a/arch/s390/pci/pci_event.c b/arch/s390/pci/pci_event.c
index 5b8d647523f9..6a5bfa9dc1f2 100644
--- a/arch/s390/pci/pci_event.c
+++ b/arch/s390/pci/pci_event.c
@@ -52,6 +52,8 @@ static void __zpci_event_error(struct zpci_ccdf_err *ccdf)
 	struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
 	struct pci_dev *pdev = NULL;
 
+	zpci_dbg(3, "err fid:%x, fh:%x, pec:%x\n",
+		 ccdf->fid, ccdf->fh, ccdf->pec);
 	zpci_err("error CCDF:\n");
 	zpci_err_hex(ccdf, sizeof(*ccdf));
 
@@ -96,6 +98,8 @@ static void __zpci_event_availability(struct zpci_ccdf_avail *ccdf)
 	struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
 	enum zpci_state state;
 
+	zpci_dbg(3, "avl fid:%x, fh:%x, pec:%x\n",
+		 ccdf->fid, ccdf->fh, ccdf->pec);
 	zpci_err("avail CCDF:\n");
 	zpci_err_hex(ccdf, sizeof(*ccdf));
 
diff --git a/arch/s390/pci/pci_sysfs.c b/arch/s390/pci/pci_sysfs.c
index 335c281811c7..cae280e5c047 100644
--- a/arch/s390/pci/pci_sysfs.c
+++ b/arch/s390/pci/pci_sysfs.c
@@ -90,6 +90,14 @@ static ssize_t recover_store(struct device *dev, struct device_attribute *attr,
 
 		if (zdev_enabled(zdev)) {
 			ret = zpci_disable_device(zdev);
+			/*
+			 * Due to a z/VM vs LPAR inconsistency in the error
+			 * state the FH may indicate an enabled device but
+			 * disable says the device is already disabled don't
+			 * treat it as an error here.
+			 */
+			if (ret == -EINVAL)
+				ret = 0;
 			if (ret)
 				goto out;
 		}