From 164793379ad3b7ef5fc5a28260c111358892dff3 Mon Sep 17 00:00:00 2001 From: Andrew Donnellan Date: Thu, 28 Jul 2016 15:39:41 +1000 Subject: cxl: Fix NULL dereference in cxl_context_init() on PowerVM guests Commit f67a6722d650 ("cxl: Workaround PE=0 hardware limitation in Mellanox CX4") added a "min_pe" field to struct cxl_service_layer_ops, to allow us to work around a Mellanox CX-4 hardware limitation. When allocating the PE number in cxl_context_init(), we read from ctx->afu->adapter->native->sl_ops->min_pe to get the minimum PE number. Unsurprisingly, in a PowerVM guest ctx->afu->adapter->native is NULL, and guests don't have a cxl_service_layer_ops struct anywhere. Move min_pe from struct cxl_service_layer_ops to struct cxl so it's accessible in both native and PowerVM environments. For the Mellanox CX-4, set the min_pe value in set_sl_ops(). Fixes: f67a6722d650 ("cxl: Workaround PE=0 hardware limitation in Mellanox CX4") Reported-by: Frederic Barrat Signed-off-by: Andrew Donnellan Acked-by: Ian Munsie Reviewed-by: Frederic Barrat Signed-off-by: Michael Ellerman --- drivers/misc/cxl/pci.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/misc/cxl/pci.c') diff --git a/drivers/misc/cxl/pci.c b/drivers/misc/cxl/pci.c index d152e2de8c93..1d0347c36e6d 100644 --- a/drivers/misc/cxl/pci.c +++ b/drivers/misc/cxl/pci.c @@ -1521,14 +1521,15 @@ static const struct cxl_service_layer_ops xsl_ops = { .write_timebase_ctrl = write_timebase_ctrl_xsl, .timebase_read = timebase_read_xsl, .capi_mode = OPAL_PHB_CAPI_MODE_DMA, - .min_pe = 1, /* Workaround for Mellanox CX4 HW bug */ }; static void set_sl_ops(struct cxl *adapter, struct pci_dev *dev) { if (dev->vendor == PCI_VENDOR_ID_MELLANOX && dev->device == 0x1013) { + /* Mellanox CX-4 */ dev_info(&adapter->dev, "Device uses an XSL\n"); adapter->native->sl_ops = &xsl_ops; + adapter->min_pe = 1; /* Workaround for CX-4 hardware bug */ } else { dev_info(&adapter->dev, "Device uses a PSL\n"); adapter->native->sl_ops = &psl_ops; -- cgit v1.2.2 From c6d2ee09c2fffd3efdd31be2b2811d081a45bb99 Mon Sep 17 00:00:00 2001 From: Frederic Barrat Date: Mon, 8 Aug 2016 11:57:48 +0200 Subject: cxl: Set psl_fir_cntl to production environment value Switch the setting of psl_fir_cntl from debug to production environment recommended value. It mostly affects the PSL behavior when an error is raised in psl_fir1/2. Tested with cxlflash. Signed-off-by: Frederic Barrat Reviewed-by: Uma Krishnan Signed-off-by: Michael Ellerman --- drivers/misc/cxl/pci.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) (limited to 'drivers/misc/cxl/pci.c') diff --git a/drivers/misc/cxl/pci.c b/drivers/misc/cxl/pci.c index 1d0347c36e6d..6f0c4ac4b649 100644 --- a/drivers/misc/cxl/pci.c +++ b/drivers/misc/cxl/pci.c @@ -379,7 +379,7 @@ static int calc_capp_routing(struct pci_dev *dev, u64 *chipid, u64 *capp_unit_id static int init_implementation_adapter_psl_regs(struct cxl *adapter, struct pci_dev *dev) { - u64 psl_dsnctl; + u64 psl_dsnctl, psl_fircntl; u64 chipid; u64 capp_unit_id; int rc; @@ -398,8 +398,11 @@ static int init_implementation_adapter_psl_regs(struct cxl *adapter, struct pci_ cxl_p1_write(adapter, CXL_PSL_RESLCKTO, 0x20000000200ULL); /* snoop write mask */ cxl_p1_write(adapter, CXL_PSL_SNWRALLOC, 0x00000000FFFFFFFFULL); - /* set fir_accum */ - cxl_p1_write(adapter, CXL_PSL_FIR_CNTL, 0x0800000000000000ULL); + /* set fir_cntl to recommended value for production env */ + psl_fircntl = (0x2ULL << (63-3)); /* ce_report */ + psl_fircntl |= (0x1ULL << (63-6)); /* FIR_report */ + psl_fircntl |= 0x1ULL; /* ce_thresh */ + cxl_p1_write(adapter, CXL_PSL_FIR_CNTL, psl_fircntl); /* for debugging with trace arrays */ cxl_p1_write(adapter, CXL_PSL_TRACE, 0x0000FF7C00000000ULL); -- cgit v1.2.2