Merge tag 'powerpc-4.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc updates from Michael Ellerman:

 - Kconfig: remove BE-only platforms from LE kernel build from Boqun
   Feng
 - Refresh ps3_defconfig from Geoff Levand
 - Emit GNU & SysV hashes for the vdso from Michael Ellerman
 - Define an enum for the bolted SLB indexes from Anshuman Khandual
 - Use a local to avoid multiple calls to get_slb_shadow() from Michael
   Ellerman
 - Add gettimeofday() benchmark from Michael Neuling
 - Avoid link stack corruption in __get_datapage() from Michael Neuling
 - Add virt_to_pfn and use this instead of opencoding from Aneesh Kumar
   K.V
 - Add ppc64le_defconfig from Michael Ellerman
 - pseries: extract of_helpers module from Andy Shevchenko
 - Correct string length in pseries_of_derive_parent() from Nathan
   Fontenot
 - Free the MSI bitmap if it was slab allocated from Denis Kirjanov
 - Shorten irq_chip name for the SIU from Christophe Leroy
 - Wait 1s for secondaries to enter OPAL during kexec from Samuel
   Mendoza-Jonas
 - Fix _ALIGN_* errors due to type difference, from Aneesh Kumar K.V
 - powerpc/pseries/hvcserver: don't memset pi_buff if it is null from
   Colin Ian King
 - Disable hugepd for 64K page size, from Aneesh Kumar K.V
 - Differentiate between hugetlb and THP during page walk from Aneesh
   Kumar K.V
 - Make PCI non-optional for pseries from Michael Ellerman
 - Individual System V IPC system calls from Sam bobroff
 - Add selftest of unmuxed IPC calls from Michael Ellerman
 - discard .exit.data at runtime from Stephen Rothwell
 - Delete old orphaned PrPMC 280/2800 DTS and boot file, from Paul
   Gortmaker
 - Use of_get_next_parent to simplify code from Christophe Jaillet
 - Paginate some xmon output from Sam bobroff
 - Add some more elements to the xmon PACA dump from Michael Ellerman
 - Allow the tm-syscall selftest to build with old headers from Michael
   Ellerman
 - Run EBB selftests only on POWER8 from Denis Kirjanov
 - Drop CONFIG_TUNE_CELL in favour of CONFIG_CELL_CPU from Michael
   Ellerman
 - Avoid reference to potentially freed memory in prom.c from Christophe
   Jaillet
 - Quieten boot wrapper output with run_cmd from Geoff Levand
 - EEH fixes and cleanups from Gavin Shan
 - Fix recursive fenced PHB on Broadcom shiner adapter from Gavin Shan
 - Use of_get_next_parent() in of_get_ibm_chip_id() from Michael
   Ellerman
 - Fix section mismatch warning in msi_bitmap_alloc() from Denis
   Kirjanov
 - Fix ps3-lpm white space from Rudhresh Kumar J
 - Fix ps3-vuart null dereference from Colin King
 - nvram: Add missing kfree in error path from Christophe Jaillet
 - nvram: Fix function name in some errors messages, from Christophe
   Jaillet
 - drivers/macintosh: adb: fix misleading Kconfig help text from Aaro
   Koskinen
 - agp/uninorth: fix a memleak in create_gatt_table from Denis Kirjanov
 - cxl: Free virtual PHB when removing from Andrew Donnellan
 - scripts/kconfig/Makefile: Allow KBUILD_DEFCONFIG to be a target from
   Michael Ellerman
 - scripts/kconfig/Makefile: Fix KBUILD_DEFCONFIG check when building
   with O= from Michael Ellerman
 - Freescale updates from Scott: Highlights include 64-bit book3e
   kexec/kdump support, a rework of the qoriq clock driver, device tree
   changes including qoriq fman nodes, support for a new 85xx board, and
   some fixes.
 - MPC5xxx updates from Anatolij: Highlights include a driver for
   MPC512x LocalPlus Bus FIFO with its device tree binding
   documentation, mpc512x device tree updates and some minor fixes.

* tag 'powerpc-4.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (106 commits)
  powerpc/msi: Fix section mismatch warning in msi_bitmap_alloc()
  powerpc/prom: Use of_get_next_parent() in of_get_ibm_chip_id()
  powerpc/pseries: Correct string length in pseries_of_derive_parent()
  powerpc/e6500: hw tablewalk: make sure we invalidate and write to the same tlb entry
  powerpc/mpc85xx: Add FSL QorIQ DPAA FMan support to the SoC device tree(s)
  powerpc/mpc85xx: Create dts components for the FSL QorIQ DPAA FMan
  powerpc/fsl: Add #clock-cells and clockgen label to clockgen nodes
  powerpc: handle error case in cpm_muram_alloc()
  powerpc: mpic: use IRQCHIP_SKIP_SET_WAKE instead of redundant mpic_irq_set_wake
  powerpc/book3e-64: Enable kexec
  powerpc/book3e-64/kexec: Set "r4 = 0" when entering spinloop
  powerpc/booke: Only use VIRT_PHYS_OFFSET on booke32
  powerpc/book3e-64/kexec: Enable SMP release
  powerpc/book3e-64/kexec: create an identity TLB mapping
  powerpc/book3e-64: Don't limit paca to 256 MiB
  powerpc/book3e/kdump: Enable crash_kexec_wait_realmode
  powerpc/book3e: support CONFIG_RELOCATABLE
  powerpc/booke64: Fix args to copy_and_flush
  powerpc/book3e-64: rename interrupt_end_book3e with __end_interrupts
  powerpc/e6500: kexec: Handle hardware threads
  ...

1 files changed, 62 insertions, 24 deletions

diff --git a/arch/powerpc/sysdev/fsl_pci.c b/arch/powerpc/sysdev/fsl_pci.c
index 13b9bcf5485e..610f472f91d1 100644
--- a/arch/powerpc/sysdev/fsl_pci.c
+++ b/arch/powerpc/sysdev/fsl_pci.c
@@ -179,6 +179,19 @@ static int setup_one_atmu(struct ccsr_pci __iomem *pci,
 	return i;
 }
 
+static bool is_kdump(void)
+{
+	struct device_node *node;
+
+	node = of_find_node_by_type(NULL, "memory");
+	if (!node) {
+		WARN_ON_ONCE(1);
+		return false;
+	}
+
+	return of_property_read_bool(node, "linux,usable-memory");
+}
+
 /* atmu setup for fsl pci/pcie controller */
 static void setup_pci_atmu(struct pci_controller *hose)
 {
@@ -192,6 +205,16 @@ static void setup_pci_atmu(struct pci_controller *hose)
 	const char *name = hose->dn->full_name;
 	const u64 *reg;
 	int len;
+	bool setup_inbound;
+
+	/*
+	 * If this is kdump, we don't want to trigger a bunch of PCI
+	 * errors by closing the window on in-flight DMA.
+	 *
+	 * We still run most of the function's logic so that things like
+	 * hose->dma_window_size still get set.
+	 */
+	setup_inbound = !is_kdump();
 
 	if (early_find_capability(hose, 0, 0, PCI_CAP_ID_EXP)) {
 		if (in_be32(&pci->block_rev1) >= PCIE_IP_REV_2_2) {
@@ -204,8 +227,11 @@ static void setup_pci_atmu(struct pci_controller *hose)
 	/* Disable all windows (except powar0 since it's ignored) */
 	for(i = 1; i < 5; i++)
 		out_be32(&pci->pow[i].powar, 0);
-	for (i = start_idx; i < end_idx; i++)
-		out_be32(&pci->piw[i].piwar, 0);
+
+	if (setup_inbound) {
+		for (i = start_idx; i < end_idx; i++)
+			out_be32(&pci->piw[i].piwar, 0);
+	}
 
 	/* Setup outbound MEM window */
 	for(i = 0, j = 1; i < 3; i++) {
@@ -278,6 +304,7 @@ static void setup_pci_atmu(struct pci_controller *hose)
 
 	/* Setup inbound mem window */
 	mem = memblock_end_of_DRAM();
+	pr_info("%s: end of DRAM %llx\n", __func__, mem);
 
 	/*
 	 * The msi-address-64 property, if it exists, indicates the physical
@@ -320,12 +347,14 @@ static void setup_pci_atmu(struct pci_controller *hose)
 
 		piwar |= ((mem_log - 1) & PIWAR_SZ_MASK);
 
-		/* Setup inbound memory window */
-		out_be32(&pci->piw[win_idx].pitar,  0x00000000);
-		out_be32(&pci->piw[win_idx].piwbar, 0x00000000);
-		out_be32(&pci->piw[win_idx].piwar,  piwar);
-		win_idx--;
+		if (setup_inbound) {
+			/* Setup inbound memory window */
+			out_be32(&pci->piw[win_idx].pitar,  0x00000000);
+			out_be32(&pci->piw[win_idx].piwbar, 0x00000000);
+			out_be32(&pci->piw[win_idx].piwar,  piwar);
+		}
 
+		win_idx--;
 		hose->dma_window_base_cur = 0x00000000;
 		hose->dma_window_size = (resource_size_t)sz;
 
@@ -343,13 +372,15 @@ static void setup_pci_atmu(struct pci_controller *hose)
 
 			piwar = (piwar & ~PIWAR_SZ_MASK) | (mem_log - 1);
 
-			/* Setup inbound memory window */
-			out_be32(&pci->piw[win_idx].pitar,  0x00000000);
-			out_be32(&pci->piw[win_idx].piwbear,
-					pci64_dma_offset >> 44);
-			out_be32(&pci->piw[win_idx].piwbar,
-					pci64_dma_offset >> 12);
-			out_be32(&pci->piw[win_idx].piwar,  piwar);
+			if (setup_inbound) {
+				/* Setup inbound memory window */
+				out_be32(&pci->piw[win_idx].pitar,  0x00000000);
+				out_be32(&pci->piw[win_idx].piwbear,
+						pci64_dma_offset >> 44);
+				out_be32(&pci->piw[win_idx].piwbar,
+						pci64_dma_offset >> 12);
+				out_be32(&pci->piw[win_idx].piwar,  piwar);
+			}
 
 			/*
 			 * install our own dma_set_mask handler to fixup dma_ops
@@ -362,12 +393,15 @@ static void setup_pci_atmu(struct pci_controller *hose)
 	} else {
 		u64 paddr = 0;
 
-		/* Setup inbound memory window */
-		out_be32(&pci->piw[win_idx].pitar,  paddr >> 12);
-		out_be32(&pci->piw[win_idx].piwbar, paddr >> 12);
-		out_be32(&pci->piw[win_idx].piwar,  (piwar | (mem_log - 1)));
-		win_idx--;
+		if (setup_inbound) {
+			/* Setup inbound memory window */
+			out_be32(&pci->piw[win_idx].pitar,  paddr >> 12);
+			out_be32(&pci->piw[win_idx].piwbar, paddr >> 12);
+			out_be32(&pci->piw[win_idx].piwar,
+				 (piwar | (mem_log - 1)));
+		}
 
+		win_idx--;
 		paddr += 1ull << mem_log;
 		sz -= 1ull << mem_log;
 
@@ -375,11 +409,15 @@ static void setup_pci_atmu(struct pci_controller *hose)
 			mem_log = ilog2(sz);
 			piwar |= (mem_log - 1);
 
-			out_be32(&pci->piw[win_idx].pitar,  paddr >> 12);
-			out_be32(&pci->piw[win_idx].piwbar, paddr >> 12);
-			out_be32(&pci->piw[win_idx].piwar,  piwar);
-			win_idx--;
+			if (setup_inbound) {
+				out_be32(&pci->piw[win_idx].pitar,
+					 paddr >> 12);
+				out_be32(&pci->piw[win_idx].piwbar,
+					 paddr >> 12);
+				out_be32(&pci->piw[win_idx].piwar, piwar);
+			}
 
+			win_idx--;
 			paddr += 1ull << mem_log;
 		}
 
@@ -1002,7 +1040,7 @@ int fsl_pci_mcheck_exception(struct pt_regs *regs)
 			ret = probe_kernel_address((void *)regs->nip, inst);
 		}
 
-		if (mcheck_handle_load(regs, inst)) {
+		if (!ret && mcheck_handle_load(regs, inst)) {
 			regs->nip += 4;
 			return 1;
 		}