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Message-ID: <20130326224247.15072.99079.stgit@djiang5-linux2.ch.intel.com>
Date: Tue, 26 Mar 2013 15:42:47 -0700
From: Dave Jiang <dave.jiang@...el.com>
To: djbw@...com
Cc: vinod.koul@...el.com, linux-kernel@...r.kernel.org
Subject: [PATCH 03/10] ioatdma: channel reset scheme fixup on Intel Atom
S1200 platforms
The Intel Atom S1200 family ioatdma changed the channel reset behavior.
It does a reset similar to PCI FLR by resetting all the MSIX
registers. We have to re-init msix interrupts because of this. This
workaround is only specific to this platform and is not expected to carry
over to the later generations.
Signed-off-by: Dave Jiang <dave.jiang@...el.com>
---
drivers/dma/ioat/dma.c | 8 +-
drivers/dma/ioat/dma.h | 10 ++
drivers/dma/ioat/dma_v3.c | 236 +++++++++++++++++++++++++++++----------------
3 files changed, 171 insertions(+), 83 deletions(-)
diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c
index 1879a59..17a2393 100644
--- a/drivers/dma/ioat/dma.c
+++ b/drivers/dma/ioat/dma.c
@@ -892,7 +892,7 @@ MODULE_PARM_DESC(ioat_interrupt_style,
* ioat_dma_setup_interrupts - setup interrupt handler
* @device: ioat device
*/
-static int ioat_dma_setup_interrupts(struct ioatdma_device *device)
+int ioat_dma_setup_interrupts(struct ioatdma_device *device)
{
struct ioat_chan_common *chan;
struct pci_dev *pdev = device->pdev;
@@ -941,6 +941,7 @@ msix:
}
}
intrctrl |= IOAT_INTRCTRL_MSIX_VECTOR_CONTROL;
+ device->irq_mode = IOAT_MSIX;
goto done;
msix_single_vector:
@@ -956,6 +957,7 @@ msix_single_vector:
pci_disable_msix(pdev);
goto msi;
}
+ device->irq_mode = IOAT_MSIX_SINGLE;
goto done;
msi:
@@ -969,6 +971,7 @@ msi:
pci_disable_msi(pdev);
goto intx;
}
+ device->irq_mode = IOAT_MSIX;
goto done;
intx:
@@ -977,6 +980,7 @@ intx:
if (err)
goto err_no_irq;
+ device->irq_mode = IOAT_INTX;
done:
if (device->intr_quirk)
device->intr_quirk(device);
@@ -987,9 +991,11 @@ done:
err_no_irq:
/* Disable all interrupt generation */
writeb(0, device->reg_base + IOAT_INTRCTRL_OFFSET);
+ device->irq_mode = IOAT_NOIRQ;
dev_err(dev, "no usable interrupts\n");
return err;
}
+EXPORT_SYMBOL(ioat_dma_setup_interrupts);
static void ioat_disable_interrupts(struct ioatdma_device *device)
{
diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h
index 9285caa..b16902c 100644
--- a/drivers/dma/ioat/dma.h
+++ b/drivers/dma/ioat/dma.h
@@ -48,6 +48,14 @@
*/
#define NULL_DESC_BUFFER_SIZE 1
+enum ioat_irq_mode {
+ IOAT_NOIRQ = 0,
+ IOAT_MSIX,
+ IOAT_MSIX_SINGLE,
+ IOAT_MSI,
+ IOAT_INTX
+};
+
/**
* struct ioatdma_device - internal representation of a IOAT device
* @pdev: PCI-Express device
@@ -77,6 +85,7 @@ struct ioatdma_device {
struct msix_entry msix_entries[4];
struct ioat_chan_common *idx[4];
struct dca_provider *dca;
+ enum ioat_irq_mode irq_mode;
void (*intr_quirk)(struct ioatdma_device *device);
int (*enumerate_channels)(struct ioatdma_device *device);
int (*reset_hw)(struct ioat_chan_common *chan);
@@ -341,6 +350,7 @@ bool ioat_cleanup_preamble(struct ioat_chan_common *chan,
dma_addr_t *phys_complete);
void ioat_kobject_add(struct ioatdma_device *device, struct kobj_type *type);
void ioat_kobject_del(struct ioatdma_device *device);
+int ioat_dma_setup_interrupts(struct ioatdma_device *device);
extern const struct sysfs_ops ioat_sysfs_ops;
extern struct ioat_sysfs_entry ioat_version_attr;
extern struct ioat_sysfs_entry ioat_cap_attr;
diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c
index ab5655e..65b912a 100644
--- a/drivers/dma/ioat/dma_v3.c
+++ b/drivers/dma/ioat/dma_v3.c
@@ -111,6 +111,103 @@ static void pq_set_src(struct ioat_raw_descriptor *descs[2],
pq->coef[idx] = coef;
}
+static bool is_jf_ioat(struct pci_dev *pdev)
+{
+ switch (pdev->device) {
+ case PCI_DEVICE_ID_INTEL_IOAT_JSF0:
+ case PCI_DEVICE_ID_INTEL_IOAT_JSF1:
+ case PCI_DEVICE_ID_INTEL_IOAT_JSF2:
+ case PCI_DEVICE_ID_INTEL_IOAT_JSF3:
+ case PCI_DEVICE_ID_INTEL_IOAT_JSF4:
+ case PCI_DEVICE_ID_INTEL_IOAT_JSF5:
+ case PCI_DEVICE_ID_INTEL_IOAT_JSF6:
+ case PCI_DEVICE_ID_INTEL_IOAT_JSF7:
+ case PCI_DEVICE_ID_INTEL_IOAT_JSF8:
+ case PCI_DEVICE_ID_INTEL_IOAT_JSF9:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool is_snb_ioat(struct pci_dev *pdev)
+{
+ switch (pdev->device) {
+ case PCI_DEVICE_ID_INTEL_IOAT_SNB0:
+ case PCI_DEVICE_ID_INTEL_IOAT_SNB1:
+ case PCI_DEVICE_ID_INTEL_IOAT_SNB2:
+ case PCI_DEVICE_ID_INTEL_IOAT_SNB3:
+ case PCI_DEVICE_ID_INTEL_IOAT_SNB4:
+ case PCI_DEVICE_ID_INTEL_IOAT_SNB5:
+ case PCI_DEVICE_ID_INTEL_IOAT_SNB6:
+ case PCI_DEVICE_ID_INTEL_IOAT_SNB7:
+ case PCI_DEVICE_ID_INTEL_IOAT_SNB8:
+ case PCI_DEVICE_ID_INTEL_IOAT_SNB9:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool is_ivb_ioat(struct pci_dev *pdev)
+{
+ switch (pdev->device) {
+ case PCI_DEVICE_ID_INTEL_IOAT_IVB0:
+ case PCI_DEVICE_ID_INTEL_IOAT_IVB1:
+ case PCI_DEVICE_ID_INTEL_IOAT_IVB2:
+ case PCI_DEVICE_ID_INTEL_IOAT_IVB3:
+ case PCI_DEVICE_ID_INTEL_IOAT_IVB4:
+ case PCI_DEVICE_ID_INTEL_IOAT_IVB5:
+ case PCI_DEVICE_ID_INTEL_IOAT_IVB6:
+ case PCI_DEVICE_ID_INTEL_IOAT_IVB7:
+ case PCI_DEVICE_ID_INTEL_IOAT_IVB8:
+ case PCI_DEVICE_ID_INTEL_IOAT_IVB9:
+ return true;
+ default:
+ return false;
+ }
+
+}
+
+static bool is_hsw_ioat(struct pci_dev *pdev)
+{
+ switch (pdev->device) {
+ case PCI_DEVICE_ID_INTEL_IOAT_HSW0:
+ case PCI_DEVICE_ID_INTEL_IOAT_HSW1:
+ case PCI_DEVICE_ID_INTEL_IOAT_HSW2:
+ case PCI_DEVICE_ID_INTEL_IOAT_HSW3:
+ case PCI_DEVICE_ID_INTEL_IOAT_HSW4:
+ case PCI_DEVICE_ID_INTEL_IOAT_HSW5:
+ case PCI_DEVICE_ID_INTEL_IOAT_HSW6:
+ case PCI_DEVICE_ID_INTEL_IOAT_HSW7:
+ case PCI_DEVICE_ID_INTEL_IOAT_HSW8:
+ case PCI_DEVICE_ID_INTEL_IOAT_HSW9:
+ return true;
+ default:
+ return false;
+ }
+
+}
+
+static bool is_xeon_cb32(struct pci_dev *pdev)
+{
+ return is_jf_ioat(pdev) || is_snb_ioat(pdev) || is_ivb_ioat(pdev) ||
+ is_hsw_ioat(pdev);
+}
+
+static bool is_bwd_ioat(struct pci_dev *pdev)
+{
+ switch (pdev->device) {
+ case PCI_DEVICE_ID_INTEL_IOAT_BWD0:
+ case PCI_DEVICE_ID_INTEL_IOAT_BWD1:
+ case PCI_DEVICE_ID_INTEL_IOAT_BWD2:
+ case PCI_DEVICE_ID_INTEL_IOAT_BWD3:
+ return true;
+ default:
+ return false;
+ }
+}
+
static void ioat3_dma_unmap(struct ioat2_dma_chan *ioat,
struct ioat_ring_ent *desc, int idx)
{
@@ -1168,6 +1265,56 @@ static int ioat3_dma_self_test(struct ioatdma_device *device)
return 0;
}
+static int ioat3_irq_reinit(struct ioatdma_device *device)
+{
+ int msixcnt = device->common.chancnt;
+ struct pci_dev *pdev = device->pdev;
+ int i;
+ struct msix_entry *msix;
+ struct ioat_chan_common *chan;
+ int err = 0;
+
+ switch (device->irq_mode) {
+ case IOAT_MSIX:
+
+ for (i = 0; i < msixcnt; i++) {
+ msix = &device->msix_entries[i];
+ chan = ioat_chan_by_index(device, i);
+ devm_free_irq(&pdev->dev, msix->vector, chan);
+ }
+
+ pci_disable_msix(pdev);
+ break;
+
+ case IOAT_MSIX_SINGLE:
+ msix = &device->msix_entries[0];
+ chan = ioat_chan_by_index(device, 0);
+ devm_free_irq(&pdev->dev, msix->vector, chan);
+ pci_disable_msix(pdev);
+ break;
+
+ case IOAT_MSI:
+ chan = ioat_chan_by_index(device, 0);
+ devm_free_irq(&pdev->dev, pdev->irq, chan);
+ pci_disable_msi(pdev);
+ break;
+
+ case IOAT_INTX:
+ chan = ioat_chan_by_index(device, 0);
+ devm_free_irq(&pdev->dev, pdev->irq, chan);
+ break;
+
+ default:
+ return 0;
+ }
+
+ device->irq_mode = IOAT_NOIRQ;
+
+ err = ioat_dma_setup_interrupts(device);
+
+ return err;
+}
+
static int ioat3_reset_hw(struct ioat_chan_common *chan)
{
/* throw away whatever the channel was doing and get it
@@ -1199,91 +1346,16 @@ static int ioat3_reset_hw(struct ioat_chan_common *chan)
if (dev_id == PCI_DEVICE_ID_INTEL_IOAT_TBG0)
pci_write_config_dword(pdev, IOAT_PCI_DMAUNCERRSTS_OFFSET, 0x10);
- return ioat2_reset_sync(chan, msecs_to_jiffies(200));
-}
-
-static bool is_jf_ioat(struct pci_dev *pdev)
-{
- switch (pdev->device) {
- case PCI_DEVICE_ID_INTEL_IOAT_JSF0:
- case PCI_DEVICE_ID_INTEL_IOAT_JSF1:
- case PCI_DEVICE_ID_INTEL_IOAT_JSF2:
- case PCI_DEVICE_ID_INTEL_IOAT_JSF3:
- case PCI_DEVICE_ID_INTEL_IOAT_JSF4:
- case PCI_DEVICE_ID_INTEL_IOAT_JSF5:
- case PCI_DEVICE_ID_INTEL_IOAT_JSF6:
- case PCI_DEVICE_ID_INTEL_IOAT_JSF7:
- case PCI_DEVICE_ID_INTEL_IOAT_JSF8:
- case PCI_DEVICE_ID_INTEL_IOAT_JSF9:
- return true;
- default:
- return false;
- }
-}
-
-static bool is_snb_ioat(struct pci_dev *pdev)
-{
- switch (pdev->device) {
- case PCI_DEVICE_ID_INTEL_IOAT_SNB0:
- case PCI_DEVICE_ID_INTEL_IOAT_SNB1:
- case PCI_DEVICE_ID_INTEL_IOAT_SNB2:
- case PCI_DEVICE_ID_INTEL_IOAT_SNB3:
- case PCI_DEVICE_ID_INTEL_IOAT_SNB4:
- case PCI_DEVICE_ID_INTEL_IOAT_SNB5:
- case PCI_DEVICE_ID_INTEL_IOAT_SNB6:
- case PCI_DEVICE_ID_INTEL_IOAT_SNB7:
- case PCI_DEVICE_ID_INTEL_IOAT_SNB8:
- case PCI_DEVICE_ID_INTEL_IOAT_SNB9:
- return true;
- default:
- return false;
- }
-}
-
-static bool is_ivb_ioat(struct pci_dev *pdev)
-{
- switch (pdev->device) {
- case PCI_DEVICE_ID_INTEL_IOAT_IVB0:
- case PCI_DEVICE_ID_INTEL_IOAT_IVB1:
- case PCI_DEVICE_ID_INTEL_IOAT_IVB2:
- case PCI_DEVICE_ID_INTEL_IOAT_IVB3:
- case PCI_DEVICE_ID_INTEL_IOAT_IVB4:
- case PCI_DEVICE_ID_INTEL_IOAT_IVB5:
- case PCI_DEVICE_ID_INTEL_IOAT_IVB6:
- case PCI_DEVICE_ID_INTEL_IOAT_IVB7:
- case PCI_DEVICE_ID_INTEL_IOAT_IVB8:
- case PCI_DEVICE_ID_INTEL_IOAT_IVB9:
- return true;
- default:
- return false;
- }
-
-}
-
-static bool is_hsw_ioat(struct pci_dev *pdev)
-{
- switch (pdev->device) {
- case PCI_DEVICE_ID_INTEL_IOAT_HSW0:
- case PCI_DEVICE_ID_INTEL_IOAT_HSW1:
- case PCI_DEVICE_ID_INTEL_IOAT_HSW2:
- case PCI_DEVICE_ID_INTEL_IOAT_HSW3:
- case PCI_DEVICE_ID_INTEL_IOAT_HSW4:
- case PCI_DEVICE_ID_INTEL_IOAT_HSW5:
- case PCI_DEVICE_ID_INTEL_IOAT_HSW6:
- case PCI_DEVICE_ID_INTEL_IOAT_HSW7:
- case PCI_DEVICE_ID_INTEL_IOAT_HSW8:
- case PCI_DEVICE_ID_INTEL_IOAT_HSW9:
- return true;
- default:
- return false;
+ err = ioat2_reset_sync(chan, msecs_to_jiffies(200));
+ if (err) {
+ dev_err(&pdev->dev, "Failed to reset!\n");
+ return err;
}
-}
+ if (device->irq_mode != IOAT_NOIRQ && is_bwd_ioat(pdev))
+ err = ioat3_irq_reinit(device);
-static bool is_xeon_cb32(struct pci_dev *pdev)
-{
- return is_jf_ioat(pdev) || is_snb_ioat(pdev) || is_ivb_ioat(pdev) ||
- is_hsw_ioat(pdev);
+ return err;
}
int ioat3_dma_probe(struct ioatdma_device *device, int dca)
--
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