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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org, Brad Love <brad@nextdimension.cc>,
	Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Subject: [PATCH 4.20 17/65] media: cx23885: only reset DMA on problematic CPUs
Date: Fri, 11 Jan 2019 15:15:03 +0100
Message-ID: <20190111131058.815430757@linuxfoundation.org> (raw)
In-Reply-To: <20190111131055.331350141@linuxfoundation.org>

4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Brad Love <brad@nextdimension.cc>

commit 4bd46aa0353e022c2401a258e93b107880a66533 upstream.

It is reported that commit 95f408bbc4e4 ("media: cx23885: Ryzen DMA
related RiSC engine stall fixes") caused regresssions with other CPUs.

Ensure that the quirk will be applied only for the CPUs that
are known to cause problems.

A module option is added for explicit control of the behaviour.

Fixes: 95f408bbc4e4 ("media: cx23885: Ryzen DMA related RiSC engine stall fixes")

Signed-off-by: Brad Love <brad@nextdimension.cc>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/media/pci/cx23885/cx23885-core.c |   55 +++++++++++++++++++++++++++++--
 drivers/media/pci/cx23885/cx23885.h      |    2 +
 2 files changed, 55 insertions(+), 2 deletions(-)

--- a/drivers/media/pci/cx23885/cx23885-core.c
+++ b/drivers/media/pci/cx23885/cx23885-core.c
@@ -23,6 +23,7 @@
 #include <linux/moduleparam.h>
 #include <linux/kmod.h>
 #include <linux/kernel.h>
+#include <linux/pci.h>
 #include <linux/slab.h>
 #include <linux/interrupt.h>
 #include <linux/delay.h>
@@ -41,6 +42,18 @@ MODULE_AUTHOR("Steven Toth <stoth@linuxt
 MODULE_LICENSE("GPL");
 MODULE_VERSION(CX23885_VERSION);
 
+/*
+ * Some platforms have been found to require periodic resetting of the DMA
+ * engine. Ryzen and XEON platforms are known to be affected. The symptom
+ * encountered is "mpeg risc op code error". Only Ryzen platforms employ
+ * this workaround if the option equals 1. The workaround can be explicitly
+ * disabled for all platforms by setting to 0, the workaround can be forced
+ * on for any platform by setting to 2.
+ */
+static unsigned int dma_reset_workaround = 1;
+module_param(dma_reset_workaround, int, 0644);
+MODULE_PARM_DESC(dma_reset_workaround, "periodic RiSC dma engine reset; 0-force disable, 1-driver detect (default), 2-force enable");
+
 static unsigned int debug;
 module_param(debug, int, 0644);
 MODULE_PARM_DESC(debug, "enable debug messages");
@@ -603,8 +616,13 @@ static void cx23885_risc_disasm(struct c
 
 static void cx23885_clear_bridge_error(struct cx23885_dev *dev)
 {
-	uint32_t reg1_val = cx_read(TC_REQ); /* read-only */
-	uint32_t reg2_val = cx_read(TC_REQ_SET);
+	uint32_t reg1_val, reg2_val;
+
+	if (!dev->need_dma_reset)
+		return;
+
+	reg1_val = cx_read(TC_REQ); /* read-only */
+	reg2_val = cx_read(TC_REQ_SET);
 
 	if (reg1_val && reg2_val) {
 		cx_write(TC_REQ, reg1_val);
@@ -2058,6 +2076,37 @@ void cx23885_gpio_enable(struct cx23885_
 	/* TODO: 23-19 */
 }
 
+static struct {
+	int vendor, dev;
+} const broken_dev_id[] = {
+	/* According with
+	 * https://openbenchmarking.org/system/1703021-RI-AMDZEN08075/Ryzen%207%201800X/lspci,
+	 * 0x1451 is PCI ID for the IOMMU found on Ryzen
+	 */
+	{ PCI_VENDOR_ID_AMD, 0x1451 },
+};
+
+static bool cx23885_does_need_dma_reset(void)
+{
+	int i;
+	struct pci_dev *pdev = NULL;
+
+	if (dma_reset_workaround == 0)
+		return false;
+	else if (dma_reset_workaround == 2)
+		return true;
+
+	for (i = 0; i < ARRAY_SIZE(broken_dev_id); i++) {
+		pdev = pci_get_device(broken_dev_id[i].vendor,
+				      broken_dev_id[i].dev, NULL);
+		if (pdev) {
+			pci_dev_put(pdev);
+			return true;
+		}
+	}
+	return false;
+}
+
 static int cx23885_initdev(struct pci_dev *pci_dev,
 			   const struct pci_device_id *pci_id)
 {
@@ -2069,6 +2118,8 @@ static int cx23885_initdev(struct pci_de
 	if (NULL == dev)
 		return -ENOMEM;
 
+	dev->need_dma_reset = cx23885_does_need_dma_reset();
+
 	err = v4l2_device_register(&pci_dev->dev, &dev->v4l2_dev);
 	if (err < 0)
 		goto fail_free;
--- a/drivers/media/pci/cx23885/cx23885.h
+++ b/drivers/media/pci/cx23885/cx23885.h
@@ -451,6 +451,8 @@ struct cx23885_dev {
 	/* Analog raw audio */
 	struct cx23885_audio_dev   *audio_dev;
 
+	/* Does the system require periodic DMA resets? */
+	unsigned int		need_dma_reset:1;
 };
 
 static inline struct cx23885_dev *to_cx23885(struct v4l2_device *v4l2_dev)



  parent reply index

Thread overview: 75+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-11 14:14 [PATCH 4.20 00/65] 4.20.2-stable review Greg Kroah-Hartman
2019-01-11 14:14 ` [PATCH 4.20 01/65] scsi: zfcp: fix posting too many status read buffers leading to adapter shutdown Greg Kroah-Hartman
2019-01-11 14:14 ` [PATCH 4.20 02/65] scsi: lpfc: do not set queue->page_count to 0 if pc_sli4_params.wqpcnt is invalid Greg Kroah-Hartman
2019-01-11 14:14 ` [PATCH 4.20 03/65] fork: record start_time late Greg Kroah-Hartman
2019-01-11 14:14 ` [PATCH 4.20 04/65] zram: fix double free backing device Greg Kroah-Hartman
2019-01-11 14:14 ` [PATCH 4.20 05/65] hwpoison, memory_hotplug: allow hwpoisoned pages to be offlined Greg Kroah-Hartman
2019-01-11 14:14 ` [PATCH 4.20 06/65] mm, devm_memremap_pages: mark devm_memremap_pages() EXPORT_SYMBOL_GPL Greg Kroah-Hartman
2019-01-11 14:14 ` [PATCH 4.20 07/65] mm, devm_memremap_pages: kill mapping "System RAM" support Greg Kroah-Hartman
2019-01-11 14:14 ` [PATCH 4.20 08/65] mm, devm_memremap_pages: fix shutdown handling Greg Kroah-Hartman
2019-01-11 14:14 ` [PATCH 4.20 09/65] memcg, oom: notify on oom killer invocation from the charge path Greg Kroah-Hartman
2019-01-11 14:14 ` [PATCH 4.20 10/65] sunrpc: fix cache_head leak due to queued request Greg Kroah-Hartman
2019-01-11 14:14 ` [PATCH 4.20 11/65] sunrpc: use SVC_NET() in svcauth_gss_* functions Greg Kroah-Hartman
2019-01-11 14:14 ` [PATCH 4.20 12/65] mm, devm_memremap_pages: add MEMORY_DEVICE_PRIVATE support Greg Kroah-Hartman
2019-01-11 14:14 ` [PATCH 4.20 13/65] mm, hmm: use devm semantics for hmm_devmem_{add, remove} Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 14/65] mm, hmm: replace hmm_devmem_pages_create() with devm_memremap_pages() Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 15/65] mm, hmm: mark hmm_devmem_{add, add_resource} EXPORT_SYMBOL_GPL Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 16/65] mm, swap: fix swapoff with KSM pages Greg Kroah-Hartman
2019-01-11 14:15 ` Greg Kroah-Hartman [this message]
2019-01-11 14:15 ` [PATCH 4.20 18/65] ALSA: cs46xx: Potential NULL dereference in probe Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 19/65] ALSA: usb-audio: Avoid access before bLength check in build_audio_procunit() Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 20/65] ALSA: usb-audio: Check mixer unit descriptors more strictly Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 21/65] ALSA: usb-audio: Fix an out-of-bound read in create_composite_quirks Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 22/65] ALSA: usb-audio: Always check descriptor sizes in parser code Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 23/65] srcu: Lock srcu_data structure in srcu_gp_start() Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 24/65] driver core: Add missing dev->bus->need_parent_lock checks Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 25/65] Fix failure path in alloc_pid() Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 26/65] block: deactivate blk_stat timer in wbt_disable_default() Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 27/65] block: mq-deadline: Fix write completion handling Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 28/65] dm: do not allow readahead to limit IO size Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 29/65] dlm: fixed memory leaks after failed ls_remove_names allocation Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 30/65] dlm: possible memory leak on error path in create_lkb() Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 31/65] dlm: lost put_lkb on error path in receive_convert() and receive_unlock() Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 32/65] dlm: memory leaks on error path in dlm_user_request() Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 33/65] gfs2: Get rid of potential double-freeing in gfs2_create_inode Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 34/65] gfs2: Fix loop in gfs2_rbm_find Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 35/65] b43: Fix error in cordic routine Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 36/65] selinux: policydb - fix byte order and alignment issues Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 37/65] PCI / PM: Allow runtime PM without callback functions Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 38/65] lockd: Show pid of lockd for remote locks Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 39/65] xprtrdma: Yet another double DMA-unmap Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 40/65] nfsd4: zero-length WRITE should succeed Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 41/65] Revert "powerpc/tm: Unset MSR[TS] if not recheckpointing" Greg Kroah-Hartman
2019-01-12 21:35   ` Christoph Biedl
2019-01-13  7:11     ` Greg Kroah-Hartman
2019-01-14  0:00       ` Michael Ellerman
2019-01-14  8:10         ` Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 42/65] powerpc/tm: Set MSR[TS] just prior to recheckpoint Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 43/65] iio: adc: qcom-spmi-adc5: Initialize prescale properly Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 44/65] iio: dac: ad5686: fix bit shift read register Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 45/65] 9p/net: put a lower bound on msize Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 46/65] rxe: fix error completion wr_id and qp_num Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 47/65] stm class: Fix a module refcount leak in policy creation error path Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 48/65] RDMA/srpt: Fix a use-after-free in the channel release code Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 49/65] RDMA/iwcm: Dont copy past the end of dev_name() string Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 50/65] iommu/vt-d: Handle domain agaw being less than iommu agaw Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 51/65] sched/fair: Fix infinite loop in update_blocked_averages() by reverting a9e7f6544b9c Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 52/65] ceph: dont update importing caps mseq when handing cap export Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 53/65] video: fbdev: pxafb: Fix "WARNING: invalid free of devm_ allocated data" Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 54/65] drivers/perf: hisi: Fixup one DDRC PMU register offset Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 55/65] powerpc/4xx/ocm: Fix compilation error due to PAGE_KERNEL usage Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 56/65] selftests: Fix test errors related to lib.mk khdr target Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 57/65] genwqe: Fix size check Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 58/65] intel_th: msu: Fix an off-by-one in attribute store Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 59/65] power: supply: olpc_battery: correct the temperature units Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 60/65] of: of_node_get()/of_node_put() nodes held in phandle cache Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 61/65] of: __of_detach_node() - remove node from " Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 62/65] lib: fix build failure in CONFIG_DEBUG_VIRTUAL test Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 63/65] drm/nouveau/drm/nouveau: Check rc from drm_dp_mst_topology_mgr_resume() Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 64/65] drm/vc4: Set ->is_yuv to false when num_planes == 1 Greg Kroah-Hartman
2019-01-11 14:15 ` [PATCH 4.20 65/65] drm/rockchip: psr: do not dereference encoder before it is null checked Greg Kroah-Hartman
2019-01-11 21:35 ` [PATCH 4.20 00/65] 4.20.2-stable review shuah
2019-01-12  8:03   ` Greg Kroah-Hartman
2019-01-12  8:28 ` Naresh Kamboju
2019-01-12 17:35   ` Greg Kroah-Hartman
2019-01-12 17:45 ` Guenter Roeck

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