qlcnic: Pre-allocate DMA buffer used for minidump collection

Pre-allocate the physically contiguous DMA buffer used for
minidump collection at driver load time, rather than at
run time, to minimize allocation failures. Driver will allocate
the buffer at load time if PEX DMA support capability is indicated
by the adapter.

Signed-off-by: Shahed Shaikh <shahed.shaikh@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/qlogic/qlcnic/qlcnic.h

@@ -441,6 +441,8 @@ struct qlcnic_82xx_dump_template_hdr {
 	u32	rsvd1[0];
 };
 
+#define QLC_PEX_DMA_READ_SIZE	(PAGE_SIZE * 16)
+
 struct qlcnic_fw_dump {
 	u8	clr;	/* flag to indicate if dump is cleared */
 	bool	enable; /* enable/disable dump */

drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c

@@ -2087,12 +2087,20 @@ static int qlcnic_alloc_adapter_resources(struct qlcnic_adapter *adapter)
 
 static void qlcnic_free_adapter_resources(struct qlcnic_adapter *adapter)
 {
+	struct qlcnic_fw_dump *fw_dump = &adapter->ahw->fw_dump;
+
 	kfree(adapter->recv_ctx);
 	adapter->recv_ctx = NULL;
 
-	if (adapter->ahw->fw_dump.tmpl_hdr) {
-		vfree(adapter->ahw->fw_dump.tmpl_hdr);
-		adapter->ahw->fw_dump.tmpl_hdr = NULL;
+	if (fw_dump->tmpl_hdr) {
+		vfree(fw_dump->tmpl_hdr);
+		fw_dump->tmpl_hdr = NULL;
+	}
+
+	if (fw_dump->dma_buffer) {
+		dma_free_coherent(&adapter->pdev->dev, QLC_PEX_DMA_READ_SIZE,
+				  fw_dump->dma_buffer, fw_dump->phys_addr);
+		fw_dump->dma_buffer = NULL;
 	}
 
 	kfree(adapter->ahw->reset.buff);

drivers/net/ethernet/qlogic/qlcnic/qlcnic_minidump.c

@@ -660,8 +660,6 @@ static u32 qlcnic_read_memory_test_agent(struct qlcnic_adapter *adapter,
 #define QLC_DMA_CMD_BUFF_ADDR_HI	4
 #define QLC_DMA_CMD_STATUS_CTRL		8
 
-#define QLC_PEX_DMA_READ_SIZE		(PAGE_SIZE * 16)
-
 static int qlcnic_start_pex_dma(struct qlcnic_adapter *adapter,
 				struct __mem *mem)
 {
@@ -1155,6 +1153,7 @@ int qlcnic_fw_cmd_get_minidump_temp(struct qlcnic_adapter *adapter)
 	u32 version, csum, *tmp_buf;
 	u8 use_flash_temp = 0;
 	u32 temp_size = 0;
+	void *temp_buffer;
 	int err;
 
 	ahw = adapter->ahw;
@@ -1204,6 +1203,19 @@ int qlcnic_fw_cmd_get_minidump_temp(struct qlcnic_adapter *adapter)
 
 	qlcnic_cache_tmpl_hdr_values(adapter, fw_dump);
 
+	if (fw_dump->use_pex_dma) {
+		fw_dump->dma_buffer = NULL;
+		temp_buffer = dma_alloc_coherent(&adapter->pdev->dev,
+						 QLC_PEX_DMA_READ_SIZE,
+						 &fw_dump->phys_addr,
+						 GFP_KERNEL);
+		if (!temp_buffer)
+			fw_dump->use_pex_dma = false;
+		else
+			fw_dump->dma_buffer = temp_buffer;
+	}
+
+
 	dev_info(&adapter->pdev->dev,
 		 "Default minidump capture mask 0x%x\n",
 		 fw_dump->cap_mask);
@@ -1223,7 +1235,7 @@ int qlcnic_dump_fw(struct qlcnic_adapter *adapter)
 	struct device *dev = &adapter->pdev->dev;
 	struct qlcnic_hardware_context *ahw;
 	struct qlcnic_dump_entry *entry;
-	void *temp_buffer, *tmpl_hdr;
+	void *tmpl_hdr;
 	u32 ocm_window;
 	__le32 *buffer;
 	char mesg[64];
@@ -1267,16 +1279,6 @@ int qlcnic_dump_fw(struct qlcnic_adapter *adapter)
 	qlcnic_set_sys_info(adapter, tmpl_hdr, 0, QLCNIC_DRIVER_VERSION);
 	qlcnic_set_sys_info(adapter, tmpl_hdr, 1, adapter->fw_version);
 
-	if (fw_dump->use_pex_dma) {
-		temp_buffer = dma_alloc_coherent(dev, QLC_PEX_DMA_READ_SIZE,
-						 &fw_dump->phys_addr,
-						 GFP_KERNEL);
-		if (!temp_buffer)
-			fw_dump->use_pex_dma = false;
-		else
-			fw_dump->dma_buffer = temp_buffer;
-	}
-
 	if (qlcnic_82xx_check(adapter)) {
 		ops_cnt = ARRAY_SIZE(qlcnic_fw_dump_ops);
 		fw_dump_ops = qlcnic_fw_dump_ops;
@@ -1334,10 +1336,6 @@ int qlcnic_dump_fw(struct qlcnic_adapter *adapter)
 	/* Send a udev event to notify availability of FW dump */
 	kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, msg);
 
-	if (fw_dump->use_pex_dma)
-		dma_free_coherent(dev, QLC_PEX_DMA_READ_SIZE,
-				  fw_dump->dma_buffer, fw_dump->phys_addr);
-
 	return 0;
 }