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[PATCH 0/7 v4] K3DMA fixes for HiKey HDMI audio

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  [PATCH 0/7 v4] K3DMA fixes for HiKey HDMI audio John Stultz <john.stultz@linaro.org> - 2016-08-09 02:20 +0200
    [PATCH 4/7] k3dma: Fix "nobody cared" message seen on any error John Stultz <john.stultz@linaro.org> - 2016-08-09 02:20 +0200
    [PATCH 6/7] k3dma: Fix memory handling in preparation for cyclic mode John Stultz <john.stultz@linaro.org> - 2016-08-09 02:20 +0200
    [PATCH 1/7] Kconfig: Allow k3dma driver to be selected for more then HISI3xx platforms John Stultz <john.stultz@linaro.org> - 2016-08-09 02:20 +0200
    [PATCH 5/7] k3dma: Fix occasional DMA ERR issue by using proper dma api John Stultz <john.stultz@linaro.org> - 2016-08-09 02:20 +0200

#1458337 — [PATCH 0/7 v4] K3DMA fixes for HiKey HDMI audio

Here's another go at the k3dma fixes and cyclic mode patches
needed to support audio on HiKey.

New in v4:
* Reworked patch set so fixes are applied first before features

Let me know if there is any feedback or objections!

thanks
-john

Cc: Zhangfei Gao <zhangfei.gao@linaro.org>
Cc: Jingoo Han <jg1.han@samsung.com>
Cc: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Andy Green <andy@warmcat.com>

Andy Green (4):
  k3dma: Fix hisi burst clipping
  k3dma: Fix dma err offsets
  k3dma: Fix "nobody cared" message seen on any error
  k3dma: Add cyclic mode for audio

John Stultz (3):
  Kconfig: Allow k3dma driver to be selected for more then HISI3xx
    platforms
  k3dma: Fix occasional DMA ERR issue by using proper dma api
  k3dma: Fix memory handling in preparation for cyclic mode

 drivers/dma/Kconfig |   2 +-
 drivers/dma/k3dma.c | 215 +++++++++++++++++++++++++++++++++++++++++++---------
 2 files changed, 179 insertions(+), 38 deletions(-)

-- 
1.9.1

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#1458339 — [PATCH 4/7] k3dma: Fix "nobody cared" message seen on any error

From: Andy Green <andy.green@linaro.org>

As it was before, as soon as the DMAC IP felt there was an error
he would return IRQ_NONE since no actual transfer had completed.

After spinning on that for 100K interrupts, Linux yanks the IRQ with
a "nobody cared" error.

This patch lets it handle the interrupt and keep the IRQ alive.

Cc: Zhangfei Gao <zhangfei.gao@linaro.org>
Cc: Jingoo Han <jg1.han@samsung.com>
Cc: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Andy Green <andy@warmcat.com>
Acked-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Signed-off-by: Andy Green <andy.green@linaro.org>
[jstultz: Forward ported to mainline]
Signed-off-by: John Stultz <john.stultz@linaro.org>
---
 drivers/dma/k3dma.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/k3dma.c b/drivers/dma/k3dma.c
index 7dc7816..f46b9b8 100644
--- a/drivers/dma/k3dma.c
+++ b/drivers/dma/k3dma.c
@@ -221,11 +221,13 @@ static irqreturn_t k3_dma_int_handler(int irq, void *dev_id)
 	writel_relaxed(err1, d->base + INT_ERR1_RAW);
 	writel_relaxed(err2, d->base + INT_ERR2_RAW);
 
-	if (irq_chan) {
+	if (irq_chan)
 		tasklet_schedule(&d->task);
+
+	if (irq_chan || err1 || err2)
 		return IRQ_HANDLED;
-	} else
-		return IRQ_NONE;
+
+	return IRQ_NONE;
 }
 
 static int k3_dma_start_txd(struct k3_dma_chan *c)
-- 
1.9.1

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#1458340 — [PATCH 6/7] k3dma: Fix memory handling in preparation for cyclic mode

With cyclic mode, the shared virt-dma logic doesn't actually
manage the descriptor state, nor the calling of the descriptor
free callback. This results in leaking a desc structure every
time we start an audio transfer.

Thus we must manage it ourselves. The k3dma driver already keeps
track of the active and finished descriptors via ds_run and ds_done
pointers, so cleanup how we handle those two values, so when we
tear down everything in terminate_all, call free_desc on the ds_run
and ds_done pointers if they are not null.

NOTE: HiKey doesn't use the non-cyclic dma modes, so I'm not been
able to test those modes. But with this patch we no longer leak
the desc structures.

Cc: Zhangfei Gao <zhangfei.gao@linaro.org>
Cc: Jingoo Han <jg1.han@samsung.com>
Cc: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Andy Green <andy@warmcat.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
---
 drivers/dma/k3dma.c | 38 ++++++++++++++++++++++++--------------
 1 file changed, 24 insertions(+), 14 deletions(-)

diff --git a/drivers/dma/k3dma.c b/drivers/dma/k3dma.c
index 9d96c95..8108fa1 100644
--- a/drivers/dma/k3dma.c
+++ b/drivers/dma/k3dma.c
@@ -212,7 +212,9 @@ static irqreturn_t k3_dma_int_handler(int irq, void *dev_id)
 
 				spin_lock_irqsave(&c->vc.lock, flags);
 				vchan_cookie_complete(&p->ds_run->vd);
+				WARN_ON_ONCE(p->ds_done);
 				p->ds_done = p->ds_run;
+				p->ds_run = NULL;
 				spin_unlock_irqrestore(&c->vc.lock, flags);
 			}
 			irq_chan |= BIT(i);
@@ -253,14 +255,14 @@ static int k3_dma_start_txd(struct k3_dma_chan *c)
 		 * so vc->desc_issued only contains desc pending
 		 */
 		list_del(&ds->vd.node);
+
+		WARN_ON_ONCE(c->phy->ds_run);
+		WARN_ON_ONCE(c->phy->ds_done);
 		c->phy->ds_run = ds;
-		c->phy->ds_done = NULL;
 		/* start dma */
 		k3_dma_set_desc(c->phy, &ds->desc_hw[0]);
 		return 0;
 	}
-	c->phy->ds_done = NULL;
-	c->phy->ds_run = NULL;
 	return -EAGAIN;
 }
 
@@ -594,6 +596,16 @@ static int k3_dma_config(struct dma_chan *chan,
 	return 0;
 }
 
+static void k3_dma_free_desc(struct virt_dma_desc *vd)
+{
+	struct k3_dma_desc_sw *ds =
+		container_of(vd, struct k3_dma_desc_sw, vd);
+	struct k3_dma_dev *d = to_k3_dma(vd->tx.chan->device);
+
+	dma_pool_free(d->pool, ds->desc_hw, ds->desc_hw_lli);
+	kfree(ds);
+}
+
 static int k3_dma_terminate_all(struct dma_chan *chan)
 {
 	struct k3_dma_chan *c = to_k3_chan(chan);
@@ -617,7 +629,15 @@ static int k3_dma_terminate_all(struct dma_chan *chan)
 		k3_dma_terminate_chan(p, d);
 		c->phy = NULL;
 		p->vchan = NULL;
-		p->ds_run = p->ds_done = NULL;
+		if (p->ds_run) {
+			k3_dma_free_desc(&p->ds_run->vd);
+			p->ds_run = NULL;
+		}
+		if (p->ds_done) {
+			k3_dma_free_desc(&p->ds_done->vd);
+			p->ds_done = NULL;
+		}
+
 	}
 	spin_unlock_irqrestore(&c->vc.lock, flags);
 	vchan_dma_desc_free_list(&c->vc, &head);
@@ -670,16 +690,6 @@ static int k3_dma_transfer_resume(struct dma_chan *chan)
 	return 0;
 }
 
-static void k3_dma_free_desc(struct virt_dma_desc *vd)
-{
-	struct k3_dma_desc_sw *ds =
-		container_of(vd, struct k3_dma_desc_sw, vd);
-	struct k3_dma_dev *d = to_k3_dma(vd->tx.chan->device);
-
-	dma_pool_free(d->pool, ds->desc_hw, ds->desc_hw_lli);
-	kfree(ds);
-}
-
 static const struct of_device_id k3_pdma_dt_ids[] = {
 	{ .compatible = "hisilicon,k3-dma-1.0", },
 	{}
-- 
1.9.1

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#1458341 — [PATCH 1/7] Kconfig: Allow k3dma driver to be selected for more then HISI3xx platforms

This allows the k3dma driver to be selected on HiKey via the ARCH_HISI
dependency.

Cc: Zhangfei Gao <zhangfei.gao@linaro.org>
Cc: Jingoo Han <jg1.han@samsung.com>
Cc: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Andy Green <andy@warmcat.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
---
v2:
* Use ARCH_HISI and COMPILE_TEST dependency, suggested by Mark Brown,
  instead of just removing all dependencies.
---
 drivers/dma/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index 739f797..fe2dbb8 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -279,7 +279,7 @@ config INTEL_MIC_X100_DMA
 
 config K3_DMA
 	tristate "Hisilicon K3 DMA support"
-	depends on ARCH_HI3xxx
+	depends on ARCH_HI3xxx || ARCH_HISI || COMPILE_TEST
 	select DMA_ENGINE
 	select DMA_VIRTUAL_CHANNELS
 	help
-- 
1.9.1

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#1458343 — [PATCH 5/7] k3dma: Fix occasional DMA ERR issue by using proper dma api

After lots of debugging on an occasional DMA ERR issue, I realized
that the desc structures which we point the dma hardware are being
allocated out of regular memory. This means when we fill the desc
structures, that data doesn't always get flushed out to memory by
the time we start the dma transfer, resulting in the dma engine getting
some null values, resulting in a DMA ERR on the first irq.

Thus, this patch adopts mechanism similar to the zx296702_dma of
allocating the desc structures from a dma pool, so the memory caching
rules are properly set to avoid this issue.

Cc: Zhangfei Gao <zhangfei.gao@linaro.org>
Cc: Jingoo Han <jg1.han@samsung.com>
Cc: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Andy Green <andy@warmcat.com>
Signed-off-by: John Stutlz <john.stultz@linaro.org>
---
 drivers/dma/k3dma.c | 53 +++++++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 45 insertions(+), 8 deletions(-)

diff --git a/drivers/dma/k3dma.c b/drivers/dma/k3dma.c
index f46b9b8..9d96c95 100644
--- a/drivers/dma/k3dma.c
+++ b/drivers/dma/k3dma.c
@@ -8,6 +8,8 @@
  */
 #include <linux/sched.h>
 #include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmapool.h>
 #include <linux/dmaengine.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
@@ -25,6 +27,7 @@
 
 #define DRIVER_NAME		"k3-dma"
 #define DMA_MAX_SIZE		0x1ffc
+#define LLI_BLOCK_SIZE		(4 * PAGE_SIZE)
 
 #define INT_STAT		0x00
 #define INT_TC1			0x04
@@ -68,7 +71,7 @@ struct k3_dma_desc_sw {
 	dma_addr_t		desc_hw_lli;
 	size_t			desc_num;
 	size_t			size;
-	struct k3_desc_hw	desc_hw[0];
+	struct k3_desc_hw	*desc_hw;
 };
 
 struct k3_dma_phy;
@@ -100,6 +103,7 @@ struct k3_dma_dev {
 	struct k3_dma_phy	*phy;
 	struct k3_dma_chan	*chans;
 	struct clk		*clk;
+	struct dma_pool		*pool;
 	u32			dma_channels;
 	u32			dma_requests;
 	unsigned int		irq;
@@ -414,6 +418,35 @@ static void k3_dma_fill_desc(struct k3_dma_desc_sw *ds, dma_addr_t dst,
 	ds->desc_hw[num].config = ccfg;
 }
 
+static struct k3_dma_desc_sw *k3_dma_alloc_desc_resource(int num,
+							struct dma_chan *chan)
+{
+	struct k3_dma_chan *c = to_k3_chan(chan);
+	struct k3_dma_desc_sw *ds;
+	struct k3_dma_dev *d = to_k3_dma(chan->device);
+	int lli_limit = LLI_BLOCK_SIZE / sizeof(struct k3_desc_hw);
+
+	if (num > lli_limit) {
+		dev_dbg(chan->device->dev, "vch %p: sg num %d exceed max %d\n",
+			&c->vc, num, lli_limit);
+		return NULL;
+	}
+
+	ds = kzalloc(sizeof(*ds), GFP_NOWAIT);
+	if (!ds)
+		return NULL;
+
+	ds->desc_hw = dma_pool_alloc(d->pool, GFP_NOWAIT, &ds->desc_hw_lli);
+	if (!ds->desc_hw) {
+		dev_dbg(chan->device->dev, "vch %p: dma alloc fail\n", &c->vc);
+		kfree(ds);
+		return NULL;
+	}
+	memset(ds->desc_hw, 0, sizeof(struct k3_desc_hw) * num);
+	ds->desc_num = num;
+	return ds;
+}
+
 static struct dma_async_tx_descriptor *k3_dma_prep_memcpy(
 	struct dma_chan *chan,	dma_addr_t dst, dma_addr_t src,
 	size_t len, unsigned long flags)
@@ -427,13 +460,12 @@ static struct dma_async_tx_descriptor *k3_dma_prep_memcpy(
 		return NULL;
 
 	num = DIV_ROUND_UP(len, DMA_MAX_SIZE);
-	ds = kzalloc(sizeof(*ds) + num * sizeof(ds->desc_hw[0]), GFP_ATOMIC);
+
+	ds = k3_dma_alloc_desc_resource(num, chan);
 	if (!ds)
 		return NULL;
 
-	ds->desc_hw_lli = __virt_to_phys((unsigned long)&ds->desc_hw[0]);
 	ds->size = len;
-	ds->desc_num = num;
 	num = 0;
 
 	if (!c->ccfg) {
@@ -482,12 +514,9 @@ static struct dma_async_tx_descriptor *k3_dma_prep_slave_sg(
 			num += DIV_ROUND_UP(avail, DMA_MAX_SIZE) - 1;
 	}
 
-	ds = kzalloc(sizeof(*ds) + num * sizeof(ds->desc_hw[0]), GFP_ATOMIC);
+	ds = k3_dma_alloc_desc_resource(num, chan);
 	if (!ds)
 		return NULL;
-
-	ds->desc_hw_lli = __virt_to_phys((unsigned long)&ds->desc_hw[0]);
-	ds->desc_num = num;
 	num = 0;
 
 	for_each_sg(sgl, sg, sglen, i) {
@@ -645,7 +674,9 @@ static void k3_dma_free_desc(struct virt_dma_desc *vd)
 {
 	struct k3_dma_desc_sw *ds =
 		container_of(vd, struct k3_dma_desc_sw, vd);
+	struct k3_dma_dev *d = to_k3_dma(vd->tx.chan->device);
 
+	dma_pool_free(d->pool, ds->desc_hw, ds->desc_hw_lli);
 	kfree(ds);
 }
 
@@ -708,6 +739,12 @@ static int k3_dma_probe(struct platform_device *op)
 
 	d->irq = irq;
 
+	/* A DMA memory pool for LLIs, align on 32-byte boundary */
+	d->pool = dmam_pool_create(DRIVER_NAME, &op->dev,
+					LLI_BLOCK_SIZE, 32, 0);
+	if (!d->pool)
+		return -ENOMEM;
+
 	/* init phy channel */
 	d->phy = devm_kzalloc(&op->dev,
 		d->dma_channels * sizeof(struct k3_dma_phy), GFP_KERNEL);
-- 
1.9.1

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