---

yaml --- r: 168857 b: refs/heads/master c: 228c4f5 h: refs/heads/master i: 168855: 00d17ce v: v3
git-mirror · Nov 20, 2009 · 2e6c7d9 · 2e6c7d9
1 parent b220f75
commit 2e6c7d9
Show file tree

Hide file tree

Showing 4 changed files with 10 additions and 2 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: e22dde9904c2d26a522f1a2b89854a8238bf0933
+refs/heads/master: 228c4f5cfbf1cda411d9aa7204a612a63c89b1e8
diff --git a/trunk/drivers/dma/ioat/dca.c b/trunk/drivers/dma/ioat/dca.c
@@ -103,7 +103,7 @@ static int dca_enabled_in_bios(struct pci_dev *pdev)
 	return res;
 }
 
-static int system_has_dca_enabled(struct pci_dev *pdev)
+int system_has_dca_enabled(struct pci_dev *pdev)
 {
 	if (boot_cpu_has(X86_FEATURE_DCA))
 		return dca_enabled_in_bios(pdev);

diff --git a/trunk/drivers/dma/ioat/dma_v3.c b/trunk/drivers/dma/ioat/dma_v3.c
@@ -1117,6 +1117,7 @@ static int __devinit ioat3_dma_self_test(struct ioatdma_device *device)
 int __devinit ioat3_dma_probe(struct ioatdma_device *device, int dca)
 {
 	struct pci_dev *pdev = device->pdev;
+	int dca_en = system_has_dca_enabled(pdev);
 	struct dma_device *dma;
 	struct dma_chan *c;
 	struct ioat_chan_common *chan;
@@ -1137,6 +1138,11 @@ int __devinit ioat3_dma_probe(struct ioatdma_device *device, int dca)
 	dma->device_prep_dma_interrupt = ioat3_prep_interrupt_lock;
 
 	cap = readl(device->reg_base + IOAT_DMA_CAP_OFFSET);
+
+	/* dca is incompatible with raid operations */
+	if (dca_en && (cap & (IOAT_CAP_XOR|IOAT_CAP_PQ)))
+		cap &= ~(IOAT_CAP_XOR|IOAT_CAP_PQ);
+
 	if (cap & IOAT_CAP_XOR) {
 		is_raid_device = true;
 		dma->max_xor = 8;

diff --git a/trunk/drivers/dma/ioat/hw.h b/trunk/drivers/dma/ioat/hw.h
@@ -39,6 +39,8 @@
 #define IOAT_VER_3_0            0x30    /* Version 3.0 */
 #define IOAT_VER_3_2            0x32    /* Version 3.2 */
 
+int system_has_dca_enabled(struct pci_dev *pdev);
+
 struct ioat_dma_descriptor {
 	uint32_t	size;
 	union {