[SCSI] qla4xxx: Add pex-dma support for capturing minidump
Add pex-dma support for ISP8324 and ISP8042 to improve
the minidump capture time.
Signed-off-by: Santosh Vernekar <santosh.vernekar@qlogic.com>
Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
diff --git a/drivers/scsi/qla4xxx/ql4_nx.c b/drivers/scsi/qla4xxx/ql4_nx.c
index 67831aa..c41362c 100644
--- a/drivers/scsi/qla4xxx/ql4_nx.c
+++ b/drivers/scsi/qla4xxx/ql4_nx.c
@@ -1737,6 +1737,208 @@
*d_ptr = data_ptr;
}
+static int qla4_83xx_check_dma_engine_state(struct scsi_qla_host *ha)
+{
+ int rval = QLA_SUCCESS;
+ uint32_t dma_eng_num = 0, cmd_sts_and_cntrl = 0;
+ uint64_t dma_base_addr = 0;
+ struct qla4_8xxx_minidump_template_hdr *tmplt_hdr = NULL;
+
+ tmplt_hdr = (struct qla4_8xxx_minidump_template_hdr *)
+ ha->fw_dump_tmplt_hdr;
+ dma_eng_num =
+ tmplt_hdr->saved_state_array[QLA83XX_PEX_DMA_ENGINE_INDEX];
+ dma_base_addr = QLA83XX_PEX_DMA_BASE_ADDRESS +
+ (dma_eng_num * QLA83XX_PEX_DMA_NUM_OFFSET);
+
+ /* Read the pex-dma's command-status-and-control register. */
+ rval = ha->isp_ops->rd_reg_indirect(ha,
+ (dma_base_addr + QLA83XX_PEX_DMA_CMD_STS_AND_CNTRL),
+ &cmd_sts_and_cntrl);
+
+ if (rval)
+ return QLA_ERROR;
+
+ /* Check if requested pex-dma engine is available. */
+ if (cmd_sts_and_cntrl & BIT_31)
+ return QLA_SUCCESS;
+ else
+ return QLA_ERROR;
+}
+
+static int qla4_83xx_start_pex_dma(struct scsi_qla_host *ha,
+ struct qla4_83xx_minidump_entry_rdmem_pex_dma *m_hdr)
+{
+ int rval = QLA_SUCCESS, wait = 0;
+ uint32_t dma_eng_num = 0, cmd_sts_and_cntrl = 0;
+ uint64_t dma_base_addr = 0;
+ struct qla4_8xxx_minidump_template_hdr *tmplt_hdr = NULL;
+
+ tmplt_hdr = (struct qla4_8xxx_minidump_template_hdr *)
+ ha->fw_dump_tmplt_hdr;
+ dma_eng_num =
+ tmplt_hdr->saved_state_array[QLA83XX_PEX_DMA_ENGINE_INDEX];
+ dma_base_addr = QLA83XX_PEX_DMA_BASE_ADDRESS +
+ (dma_eng_num * QLA83XX_PEX_DMA_NUM_OFFSET);
+
+ rval = ha->isp_ops->wr_reg_indirect(ha,
+ dma_base_addr + QLA83XX_PEX_DMA_CMD_ADDR_LOW,
+ m_hdr->desc_card_addr);
+ if (rval)
+ goto error_exit;
+
+ rval = ha->isp_ops->wr_reg_indirect(ha,
+ dma_base_addr + QLA83XX_PEX_DMA_CMD_ADDR_HIGH, 0);
+ if (rval)
+ goto error_exit;
+
+ rval = ha->isp_ops->wr_reg_indirect(ha,
+ dma_base_addr + QLA83XX_PEX_DMA_CMD_STS_AND_CNTRL,
+ m_hdr->start_dma_cmd);
+ if (rval)
+ goto error_exit;
+
+ /* Wait for dma operation to complete. */
+ for (wait = 0; wait < QLA83XX_PEX_DMA_MAX_WAIT; wait++) {
+ rval = ha->isp_ops->rd_reg_indirect(ha,
+ (dma_base_addr + QLA83XX_PEX_DMA_CMD_STS_AND_CNTRL),
+ &cmd_sts_and_cntrl);
+ if (rval)
+ goto error_exit;
+
+ if ((cmd_sts_and_cntrl & BIT_1) == 0)
+ break;
+ else
+ udelay(10);
+ }
+
+ /* Wait a max of 100 ms, otherwise fallback to rdmem entry read */
+ if (wait >= QLA83XX_PEX_DMA_MAX_WAIT) {
+ rval = QLA_ERROR;
+ goto error_exit;
+ }
+
+error_exit:
+ return rval;
+}
+
+static int qla4_83xx_minidump_pex_dma_read(struct scsi_qla_host *ha,
+ struct qla8xxx_minidump_entry_hdr *entry_hdr,
+ uint32_t **d_ptr)
+{
+ int rval = QLA_SUCCESS;
+ struct qla4_83xx_minidump_entry_rdmem_pex_dma *m_hdr = NULL;
+ uint32_t size, read_size;
+ uint8_t *data_ptr = (uint8_t *)*d_ptr;
+ void *rdmem_buffer = NULL;
+ dma_addr_t rdmem_dma;
+ struct qla4_83xx_pex_dma_descriptor dma_desc;
+
+ DEBUG2(ql4_printk(KERN_INFO, ha, "Entering fn: %s\n", __func__));
+
+ rval = qla4_83xx_check_dma_engine_state(ha);
+ if (rval != QLA_SUCCESS) {
+ DEBUG2(ql4_printk(KERN_INFO, ha,
+ "%s: DMA engine not available. Fallback to rdmem-read.\n",
+ __func__));
+ return QLA_ERROR;
+ }
+
+ m_hdr = (struct qla4_83xx_minidump_entry_rdmem_pex_dma *)entry_hdr;
+ rdmem_buffer = dma_alloc_coherent(&ha->pdev->dev,
+ QLA83XX_PEX_DMA_READ_SIZE,
+ &rdmem_dma, GFP_KERNEL);
+ if (!rdmem_buffer) {
+ DEBUG2(ql4_printk(KERN_INFO, ha,
+ "%s: Unable to allocate rdmem dma buffer\n",
+ __func__));
+ return QLA_ERROR;
+ }
+
+ /* Prepare pex-dma descriptor to be written to MS memory. */
+ /* dma-desc-cmd layout:
+ * 0-3: dma-desc-cmd 0-3
+ * 4-7: pcid function number
+ * 8-15: dma-desc-cmd 8-15
+ */
+ dma_desc.cmd.dma_desc_cmd = (m_hdr->dma_desc_cmd & 0xff0f);
+ dma_desc.cmd.dma_desc_cmd |= ((PCI_FUNC(ha->pdev->devfn) & 0xf) << 0x4);
+ dma_desc.dma_bus_addr = rdmem_dma;
+
+ size = 0;
+ read_size = 0;
+ /*
+ * Perform rdmem operation using pex-dma.
+ * Prepare dma in chunks of QLA83XX_PEX_DMA_READ_SIZE.
+ */
+ while (read_size < m_hdr->read_data_size) {
+ if (m_hdr->read_data_size - read_size >=
+ QLA83XX_PEX_DMA_READ_SIZE)
+ size = QLA83XX_PEX_DMA_READ_SIZE;
+ else {
+ size = (m_hdr->read_data_size - read_size);
+
+ if (rdmem_buffer)
+ dma_free_coherent(&ha->pdev->dev,
+ QLA83XX_PEX_DMA_READ_SIZE,
+ rdmem_buffer, rdmem_dma);
+
+ rdmem_buffer = dma_alloc_coherent(&ha->pdev->dev, size,
+ &rdmem_dma,
+ GFP_KERNEL);
+ if (!rdmem_buffer) {
+ DEBUG2(ql4_printk(KERN_INFO, ha,
+ "%s: Unable to allocate rdmem dma buffer\n",
+ __func__));
+ return QLA_ERROR;
+ }
+ dma_desc.dma_bus_addr = rdmem_dma;
+ }
+
+ dma_desc.src_addr = m_hdr->read_addr + read_size;
+ dma_desc.cmd.read_data_size = size;
+
+ /* Prepare: Write pex-dma descriptor to MS memory. */
+ rval = qla4_83xx_ms_mem_write_128b(ha,
+ (uint64_t)m_hdr->desc_card_addr,
+ (uint32_t *)&dma_desc,
+ (sizeof(struct qla4_83xx_pex_dma_descriptor)/16));
+ if (rval == -1) {
+ ql4_printk(KERN_INFO, ha,
+ "%s: Error writing rdmem-dma-init to MS !!!\n",
+ __func__);
+ goto error_exit;
+ }
+
+ DEBUG2(ql4_printk(KERN_INFO, ha,
+ "%s: Dma-desc: Instruct for rdmem dma (size 0x%x).\n",
+ __func__, size));
+ /* Execute: Start pex-dma operation. */
+ rval = qla4_83xx_start_pex_dma(ha, m_hdr);
+ if (rval != QLA_SUCCESS) {
+ DEBUG2(ql4_printk(KERN_INFO, ha,
+ "scsi(%ld): start-pex-dma failed rval=0x%x\n",
+ ha->host_no, rval));
+ goto error_exit;
+ }
+
+ memcpy(data_ptr, rdmem_buffer, size);
+ data_ptr += size;
+ read_size += size;
+ }
+
+ DEBUG2(ql4_printk(KERN_INFO, ha, "Leaving fn: %s\n", __func__));
+
+ *d_ptr = (uint32_t *)data_ptr;
+
+error_exit:
+ if (rdmem_buffer)
+ dma_free_coherent(&ha->pdev->dev, size, rdmem_buffer,
+ rdmem_dma);
+
+ return rval;
+}
+
static int qla4_8xxx_minidump_process_l2tag(struct scsi_qla_host *ha,
struct qla8xxx_minidump_entry_hdr *entry_hdr,
uint32_t **d_ptr)
@@ -2068,7 +2270,7 @@
#define MD_MIU_TEST_AGT_ADDR_LO 0x41000094
#define MD_MIU_TEST_AGT_ADDR_HI 0x41000098
-static int qla4_8xxx_minidump_process_rdmem(struct scsi_qla_host *ha,
+static int __qla4_8xxx_minidump_process_rdmem(struct scsi_qla_host *ha,
struct qla8xxx_minidump_entry_hdr *entry_hdr,
uint32_t **d_ptr)
{
@@ -2150,6 +2352,28 @@
return QLA_SUCCESS;
}
+static int qla4_8xxx_minidump_process_rdmem(struct scsi_qla_host *ha,
+ struct qla8xxx_minidump_entry_hdr *entry_hdr,
+ uint32_t **d_ptr)
+{
+ uint32_t *data_ptr = *d_ptr;
+ int rval = QLA_SUCCESS;
+
+ if (is_qla8032(ha) || is_qla8042(ha)) {
+ rval = qla4_83xx_minidump_pex_dma_read(ha, entry_hdr,
+ &data_ptr);
+ if (rval != QLA_SUCCESS) {
+ rval = __qla4_8xxx_minidump_process_rdmem(ha, entry_hdr,
+ &data_ptr);
+ }
+ } else {
+ rval = __qla4_8xxx_minidump_process_rdmem(ha, entry_hdr,
+ &data_ptr);
+ }
+ *d_ptr = data_ptr;
+ return rval;
+}
+
static void qla4_8xxx_mark_entry_skipped(struct scsi_qla_host *ha,
struct qla8xxx_minidump_entry_hdr *entry_hdr,
int index)