[PATCH v4 09/25] mmc: sdhci: allocate alignment and DMA descriptor buffer together

[Russell King <rmk+kernel@arm.linux.org.uk>]

Allocate both the alignment and DMA descriptor buffers together.  The
size of the alignment buffer will always be aligned to the hosts
required alignment, which gives appropriate alignment to the DMA
descriptors.

We have a maximum of 128 segments, and a maximum alignment of 64 bits.
This gives a maximum alignment buffer size of 1024 bytes.

The DMA descriptors are a maximum of 12 bytes, and we allocate 128 * 2
+ 1 of these, which gives a maximum DMA descriptor buffer size of 3084
bytes.

This means the allocation for a 4K page sized system will be an order-1
allocation, since the resulting overall size is 4108.  This is more
prone to failure than page-sized allocations, but since this allocation
commonly occurs at startup, the chances of failure are small.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 drivers/mmc/host/sdhci.c | 56 +++++++++++++++++-------------------------------
 1 file changed, 20 insertions(+), 36 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index b0655990defd..c63d35c0f84b 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2932,6 +2932,9 @@ int sdhci_add_host(struct sdhci_host *host)
 		host->flags &= ~SDHCI_USE_SDMA;
 
 	if (host->flags & SDHCI_USE_ADMA) {
+		dma_addr_t dma;
+		void *buf;
+
 		/*
 		 * The DMA descriptor table size is calculated as the maximum
 		 * number of segments times 2, to allow for an alignment
@@ -2947,45 +2950,28 @@ int sdhci_add_host(struct sdhci_host *host)
 					      SDHCI_ADMA2_32_DESC_SZ;
 			host->desc_sz = SDHCI_ADMA2_32_DESC_SZ;
 		}
-		host->adma_table = dma_alloc_coherent(mmc_dev(mmc),
-						      host->adma_table_sz,
-						      &host->adma_addr,
-						      GFP_KERNEL);
+
 		host->align_buffer_sz = SDHCI_MAX_SEGS * SDHCI_ADMA2_ALIGN;
-		host->align_buffer = dma_alloc_coherent(mmc_dev(mmc),
-							host->align_buffer_sz,
-							&host->align_addr,
-							GFP_KERNEL);
-		if (!host->adma_table || !host->align_buffer) {
-			if (host->adma_table)
-				dma_free_coherent(mmc_dev(mmc),
-						  host->adma_table_sz,
-						  host->adma_table,
-						  host->adma_addr);
-			if (host->align_buffer)
-				dma_free_coherent(mmc_dev(mmc),
-						  host->align_buffer_sz,
-						  host->align_buffer,
-						  host->align_addr);
+		buf = dma_alloc_coherent(mmc_dev(mmc), host->align_buffer_sz +
+					 host->adma_table_sz, &dma, GFP_KERNEL);
+		if (!buf) {
 			pr_warn("%s: Unable to allocate ADMA buffers - falling back to standard DMA\n",
 				mmc_hostname(mmc));
 			host->flags &= ~SDHCI_USE_ADMA;
-			host->adma_table = NULL;
-			host->align_buffer = NULL;
-		} else if (host->adma_addr & (SDHCI_ADMA2_DESC_ALIGN - 1)) {
+		} else if ((dma + host->align_buffer_sz) &
+			   (SDHCI_ADMA2_DESC_ALIGN - 1)) {
 			pr_warn("%s: unable to allocate aligned ADMA descriptor\n",
 				mmc_hostname(mmc));
 			host->flags &= ~SDHCI_USE_ADMA;
-			dma_free_coherent(mmc_dev(mmc), host->adma_table_sz,
-					  host->adma_table, host->adma_addr);
-			dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz,
-					  host->align_buffer, host->align_addr);
-			host->adma_table = NULL;
-			host->align_buffer = NULL;
-		}
+			dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
+					  host->adma_table_sz, buf, dma);
+		} else {
+			host->align_buffer = buf;
+			host->align_addr = dma;
 
-		/* dma_alloc_coherent returns page aligned and sized buffers */
-		BUG_ON(host->align_addr & SDHCI_ADMA2_MASK);
+			host->adma_table = buf + host->align_buffer_sz;
+			host->adma_addr = dma + host->align_buffer_sz;
+		}
 	}
 
 	/*
@@ -3446,12 +3432,10 @@ void sdhci_remove_host(struct sdhci_host *host, int dead)
 	if (!IS_ERR(mmc->supply.vqmmc))
 		regulator_disable(mmc->supply.vqmmc);
 
-	if (host->adma_table)
-		dma_free_coherent(mmc_dev(mmc), host->adma_table_sz,
-				  host->adma_table, host->adma_addr);
 	if (host->align_buffer)
-		dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz,
-				  host->align_buffer, host->align_addr);
+		dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
+				  host->adma_table_sz, host->align_buffer,
+				  host->align_addr);
 
 	host->adma_table = NULL;
 	host->align_buffer = NULL;
-- 
2.1.0