ioat3: xor self test

This adds a hardware specific self test to be called from ioat_probe.
In the ioat3 case we will have tests for all the different raid
operations, while ioat1 and ioat2 will continue to just test memcpy.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 275 insertions, 0 deletions

diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c
index 957c205f91d0..927c08b08861 100644
--- a/drivers/dma/ioat/dma_v3.c
+++ b/drivers/dma/ioat/dma_v3.c
@@ -513,6 +513,280 @@ ioat3_prep_xor_val(struct dma_chan *chan, dma_addr_t *src,
                                      src_cnt - 1, len, flags);
 }
 
+static void __devinit ioat3_dma_test_callback(void *dma_async_param)
+{
+        struct completion *cmp = dma_async_param;
+
+        complete(cmp);
+}
+
+#define IOAT_NUM_SRC_TEST 6 /* must be <= 8 */
+static int __devinit ioat_xor_val_self_test(struct ioatdma_device *device)
+{
+        int i, src_idx;
+        struct page *dest;
+        struct page *xor_srcs[IOAT_NUM_SRC_TEST];
+        struct page *xor_val_srcs[IOAT_NUM_SRC_TEST + 1];
+        dma_addr_t dma_srcs[IOAT_NUM_SRC_TEST + 1];
+        dma_addr_t dma_addr, dest_dma;
+        struct dma_async_tx_descriptor *tx;
+        struct dma_chan *dma_chan;
+        dma_cookie_t cookie;
+        u8 cmp_byte = 0;
+        u32 cmp_word;
+        u32 xor_val_result;
+        int err = 0;
+        struct completion cmp;
+        unsigned long tmo;
+        struct device *dev = &device->pdev->dev;
+        struct dma_device *dma = &device->common;
+
+        dev_dbg(dev, "%s\n", __func__);
+
+        if (!dma_has_cap(DMA_XOR, dma->cap_mask))
+                return 0;
+
+        for (src_idx = 0; src_idx < IOAT_NUM_SRC_TEST; src_idx++) {
+                xor_srcs[src_idx] = alloc_page(GFP_KERNEL);
+                if (!xor_srcs[src_idx]) {
+                        while (src_idx--)
+                                __free_page(xor_srcs[src_idx]);
+                        return -ENOMEM;
+                }
+        }
+
+        dest = alloc_page(GFP_KERNEL);
+        if (!dest) {
+                while (src_idx--)
+                        __free_page(xor_srcs[src_idx]);
+                return -ENOMEM;
+        }
+
+        /* Fill in src buffers */
+        for (src_idx = 0; src_idx < IOAT_NUM_SRC_TEST; src_idx++) {
+                u8 *ptr = page_address(xor_srcs[src_idx]);
+                for (i = 0; i < PAGE_SIZE; i++)
+                        ptr[i] = (1 << src_idx);
+        }
+
+        for (src_idx = 0; src_idx < IOAT_NUM_SRC_TEST; src_idx++)
+                cmp_byte ^= (u8) (1 << src_idx);
+
+        cmp_word = (cmp_byte << 24) | (cmp_byte << 16) |
+                        (cmp_byte << 8) | cmp_byte;
+
+        memset(page_address(dest), 0, PAGE_SIZE);
+
+        dma_chan = container_of(dma->channels.next, struct dma_chan,
+                                device_node);
+        if (dma->device_alloc_chan_resources(dma_chan) < 1) {
+                err = -ENODEV;
+                goto out;
+        }
+
+        /* test xor */
+        dest_dma = dma_map_page(dev, dest, 0, PAGE_SIZE, DMA_FROM_DEVICE);
+        for (i = 0; i < IOAT_NUM_SRC_TEST; i++)
+                dma_srcs[i] = dma_map_page(dev, xor_srcs[i], 0, PAGE_SIZE,
+                                           DMA_TO_DEVICE);
+        tx = dma->device_prep_dma_xor(dma_chan, dest_dma, dma_srcs,
+                                      IOAT_NUM_SRC_TEST, PAGE_SIZE,
+                                      DMA_PREP_INTERRUPT);
+
+        if (!tx) {
+                dev_err(dev, "Self-test xor prep failed\n");
+                err = -ENODEV;
+                goto free_resources;
+        }
+
+        async_tx_ack(tx);
+        init_completion(&cmp);
+        tx->callback = ioat3_dma_test_callback;
+        tx->callback_param = &cmp;
+        cookie = tx->tx_submit(tx);
+        if (cookie < 0) {
+                dev_err(dev, "Self-test xor setup failed\n");
+                err = -ENODEV;
+                goto free_resources;
+        }
+        dma->device_issue_pending(dma_chan);
+
+        tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
+
+        if (dma->device_is_tx_complete(dma_chan, cookie, NULL, NULL) != DMA_SUCCESS) {
+                dev_err(dev, "Self-test xor timed out\n");
+                err = -ENODEV;
+                goto free_resources;
+        }
+
+        dma_sync_single_for_cpu(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE);
+        for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) {
+                u32 *ptr = page_address(dest);
+                if (ptr[i] != cmp_word) {
+                        dev_err(dev, "Self-test xor failed compare\n");
+                        err = -ENODEV;
+                        goto free_resources;
+                }
+        }
+        dma_sync_single_for_device(dev, dest_dma, PAGE_SIZE, DMA_TO_DEVICE);
+
+        /* skip validate if the capability is not present */
+        if (!dma_has_cap(DMA_XOR_VAL, dma_chan->device->cap_mask))
+                goto free_resources;
+
+        /* validate the sources with the destintation page */
+        for (i = 0; i < IOAT_NUM_SRC_TEST; i++)
+                xor_val_srcs[i] = xor_srcs[i];
+        xor_val_srcs[i] = dest;
+
+        xor_val_result = 1;
+
+        for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++)
+                dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE,
+                                           DMA_TO_DEVICE);
+        tx = dma->device_prep_dma_xor_val(dma_chan, dma_srcs,
+                                          IOAT_NUM_SRC_TEST + 1, PAGE_SIZE,
+                                          &xor_val_result, DMA_PREP_INTERRUPT);
+        if (!tx) {
+                dev_err(dev, "Self-test zero prep failed\n");
+                err = -ENODEV;
+                goto free_resources;
+        }
+
+        async_tx_ack(tx);
+        init_completion(&cmp);
+        tx->callback = ioat3_dma_test_callback;
+        tx->callback_param = &cmp;
+        cookie = tx->tx_submit(tx);
+        if (cookie < 0) {
+                dev_err(dev, "Self-test zero setup failed\n");
+                err = -ENODEV;
+                goto free_resources;
+        }
+        dma->device_issue_pending(dma_chan);
+
+        tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
+
+        if (dma->device_is_tx_complete(dma_chan, cookie, NULL, NULL) != DMA_SUCCESS) {
+                dev_err(dev, "Self-test validate timed out\n");
+                err = -ENODEV;
+                goto free_resources;
+        }
+
+        if (xor_val_result != 0) {
+                dev_err(dev, "Self-test validate failed compare\n");
+                err = -ENODEV;
+                goto free_resources;
+        }
+
+        /* skip memset if the capability is not present */
+        if (!dma_has_cap(DMA_MEMSET, dma_chan->device->cap_mask))
+                goto free_resources;
+
+        /* test memset */
+        dma_addr = dma_map_page(dev, dest, 0,
+                        PAGE_SIZE, DMA_FROM_DEVICE);
+        tx = dma->device_prep_dma_memset(dma_chan, dma_addr, 0, PAGE_SIZE,
+                                         DMA_PREP_INTERRUPT);
+        if (!tx) {
+                dev_err(dev, "Self-test memset prep failed\n");
+                err = -ENODEV;
+                goto free_resources;
+        }
+
+        async_tx_ack(tx);
+        init_completion(&cmp);
+        tx->callback = ioat3_dma_test_callback;
+        tx->callback_param = &cmp;
+        cookie = tx->tx_submit(tx);
+        if (cookie < 0) {
+                dev_err(dev, "Self-test memset setup failed\n");
+                err = -ENODEV;
+                goto free_resources;
+        }
+        dma->device_issue_pending(dma_chan);
+
+        tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
+
+        if (dma->device_is_tx_complete(dma_chan, cookie, NULL, NULL) != DMA_SUCCESS) {
+                dev_err(dev, "Self-test memset timed out\n");
+                err = -ENODEV;
+                goto free_resources;
+        }
+
+        for (i = 0; i < PAGE_SIZE/sizeof(u32); i++) {
+                u32 *ptr = page_address(dest);
+                if (ptr[i]) {
+                        dev_err(dev, "Self-test memset failed compare\n");
+                        err = -ENODEV;
+                        goto free_resources;
+                }
+        }
+
+        /* test for non-zero parity sum */
+        xor_val_result = 0;
+        for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++)
+                dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE,
+                                           DMA_TO_DEVICE);
+        tx = dma->device_prep_dma_xor_val(dma_chan, dma_srcs,
+                                          IOAT_NUM_SRC_TEST + 1, PAGE_SIZE,
+                                          &xor_val_result, DMA_PREP_INTERRUPT);
+        if (!tx) {
+                dev_err(dev, "Self-test 2nd zero prep failed\n");
+                err = -ENODEV;
+                goto free_resources;
+        }
+
+        async_tx_ack(tx);
+        init_completion(&cmp);
+        tx->callback = ioat3_dma_test_callback;
+        tx->callback_param = &cmp;
+        cookie = tx->tx_submit(tx);
+        if (cookie < 0) {
+                dev_err(dev, "Self-test  2nd zero setup failed\n");
+                err = -ENODEV;
+                goto free_resources;
+        }
+        dma->device_issue_pending(dma_chan);
+
+        tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
+
+        if (dma->device_is_tx_complete(dma_chan, cookie, NULL, NULL) != DMA_SUCCESS) {
+                dev_err(dev, "Self-test 2nd validate timed out\n");
+                err = -ENODEV;
+                goto free_resources;
+        }
+
+        if (xor_val_result != SUM_CHECK_P_RESULT) {
+                dev_err(dev, "Self-test validate failed compare\n");
+                err = -ENODEV;
+                goto free_resources;
+        }
+
+free_resources:
+        dma->device_free_chan_resources(dma_chan);
+out:
+        src_idx = IOAT_NUM_SRC_TEST;
+        while (src_idx--)
+                __free_page(xor_srcs[src_idx]);
+        __free_page(dest);
+        return err;
+}
+
+static int __devinit ioat3_dma_self_test(struct ioatdma_device *device)
+{
+        int rc = ioat_dma_self_test(device);
+
+        if (rc)
+                return rc;
+
+        rc = ioat_xor_val_self_test(device);
+        if (rc)
+                return rc;
+
+        return 0;
+}
+
 int __devinit ioat3_dma_probe(struct ioatdma_device *device, int dca)
 {
         struct pci_dev *pdev = device->pdev;
@@ -526,6 +800,7 @@ int __devinit ioat3_dma_probe(struct ioatdma_device *device, int dca)
         device->enumerate_channels = ioat2_enumerate_channels;
         device->cleanup_tasklet = ioat3_cleanup_tasklet;
         device->timer_fn = ioat3_timer_event;
+        device->self_test = ioat3_dma_self_test;
         dma = &device->common;
         dma->device_prep_dma_memcpy = ioat2_dma_prep_memcpy_lock;
         dma->device_issue_pending = ioat2_issue_pending;