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staging: et131x: Remove unnecessary DMA address alignment code
"The cpu return address and the DMA bus master address are both guaranteed to be aligned to the smallest PAGE_SIZE order which is greater than or equal to the requested size." There are several places in the et131x.c code where these addresses are aligned to a 4k boundary after a call to dma_alloc_coherent(), needlessly. Remove these alignment offset calculations, and the et131x_align_allocated_memory() call which is only used for 4k alignments. Signed-off-by: Mark Einon <mark.einon@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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8764893311
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@ -290,7 +290,6 @@ struct fbr_lookup {
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dma_addr_t ring_physaddr;
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void *mem_virtaddrs[MAX_DESC_PER_RING_RX / FBR_CHUNKS];
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dma_addr_t mem_physaddrs[MAX_DESC_PER_RING_RX / FBR_CHUNKS];
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dma_addr_t offset;
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u32 local_full;
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u32 num_entries;
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dma_addr_t buffsize;
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@ -2226,32 +2225,6 @@ static inline u32 bump_free_buff_ring(u32 *free_buff_ring, u32 limit)
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return tmp_free_buff_ring;
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}
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/**
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* et131x_align_allocated_memory - Align allocated memory on a given boundary
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* @adapter: pointer to our adapter structure
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* @phys_addr: pointer to Physical address
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* @offset: pointer to the offset variable
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* @mask: correct mask
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*/
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static void et131x_align_allocated_memory(struct et131x_adapter *adapter,
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dma_addr_t *phys_addr,
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dma_addr_t *offset,
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u64 mask)
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{
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u64 new_addr = *phys_addr & ~mask;
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*offset = 0;
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if (new_addr != *phys_addr) {
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/* Move to next aligned block */
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new_addr += mask + 1;
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/* Return offset for adjusting virt addr */
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*offset = new_addr - *phys_addr;
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/* Return new physical address */
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*phys_addr = new_addr;
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}
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}
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/**
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* et131x_rx_dma_memory_alloc
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* @adapter: pointer to our private adapter structure
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@ -2268,7 +2241,6 @@ static int et131x_rx_dma_memory_alloc(struct et131x_adapter *adapter)
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u32 bufsize;
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u32 pktstat_ringsize;
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u32 fbr_chunksize;
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u32 fbr_align;
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struct rx_ring *rx_ring;
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/* Setup some convenience pointers */
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@ -2331,29 +2303,13 @@ static int et131x_rx_dma_memory_alloc(struct et131x_adapter *adapter)
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"Cannot alloc memory for Free Buffer Ring %d\n", id);
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return -ENOMEM;
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}
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/* Align Free Buffer Ring on a 4K boundary */
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et131x_align_allocated_memory(adapter,
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&rx_ring->fbr[id]->ring_physaddr,
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&rx_ring->fbr[id]->offset, 0x0FFF);
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rx_ring->fbr[id]->ring_virtaddr =
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(void *)((u8 *) rx_ring->fbr[id]->ring_virtaddr +
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rx_ring->fbr[id]->offset);
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}
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for (id = 0; id < NUM_FBRS; id++) {
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if (id == 0 && rx_ring->fbr[id]->buffsize > 4096)
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fbr_align = 4096;
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else
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fbr_align = rx_ring->fbr[id]->buffsize;
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fbr_chunksize = (FBR_CHUNKS *
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rx_ring->fbr[id]->buffsize) + fbr_align - 1;
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fbr_chunksize = (FBR_CHUNKS * rx_ring->fbr[id]->buffsize);
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for (i = 0; i < (rx_ring->fbr[id]->num_entries / FBR_CHUNKS); i++) {
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dma_addr_t fbr_tmp_physaddr;
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dma_addr_t fbr_offset;
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/* This code allocates an area of memory big enough for
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* N free buffers + (buffer_size - 1) so that the
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@ -2376,11 +2332,6 @@ static int et131x_rx_dma_memory_alloc(struct et131x_adapter *adapter)
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/* See NOTE in "Save Physical Address" comment above */
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fbr_tmp_physaddr = rx_ring->fbr[id]->mem_physaddrs[i];
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et131x_align_allocated_memory(adapter,
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&fbr_tmp_physaddr,
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&fbr_offset,
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(fbr_align - 1));
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for (j = 0; j < FBR_CHUNKS; j++) {
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u32 index = (i * FBR_CHUNKS) + j;
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@ -2389,7 +2340,7 @@ static int et131x_rx_dma_memory_alloc(struct et131x_adapter *adapter)
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*/
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rx_ring->fbr[id]->virt[index] =
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(u8 *) rx_ring->fbr[id]->mem_virtaddrs[i] +
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(j * rx_ring->fbr[id]->buffsize) + fbr_offset;
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(j * rx_ring->fbr[id]->buffsize);
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/* now store the physical address in the
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* descriptor so the device can access it
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@ -2499,16 +2450,8 @@ static void et131x_rx_dma_memory_free(struct et131x_adapter *adapter)
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(rx_ring->fbr[id]->num_entries / FBR_CHUNKS);
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index++) {
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if (rx_ring->fbr[id]->mem_virtaddrs[index]) {
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u32 fbr_align;
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if (rx_ring->fbr[id]->buffsize > 4096)
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fbr_align = 4096;
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else
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fbr_align = rx_ring->fbr[id]->buffsize;
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bufsize =
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(rx_ring->fbr[id]->buffsize * FBR_CHUNKS) +
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fbr_align - 1;
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bufsize = (rx_ring->fbr[id]->buffsize * FBR_CHUNKS);
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dma_free_coherent(&adapter->pdev->dev,
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bufsize,
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@ -2519,10 +2462,6 @@ static void et131x_rx_dma_memory_free(struct et131x_adapter *adapter)
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}
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}
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/* Now the FIFO itself */
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rx_ring->fbr[id]->ring_virtaddr = (void *)((u8 *)
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rx_ring->fbr[id]->ring_virtaddr - rx_ring->fbr[id]->offset);
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bufsize =
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(sizeof(struct fbr_desc) * rx_ring->fbr[id]->num_entries) +
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0xfff;
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@ -2967,7 +2906,7 @@ static int et131x_tx_dma_memory_alloc(struct et131x_adapter *adapter)
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/* Allocate enough memory for the Tx descriptor ring, and allocate
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* some extra so that the ring can be aligned on a 4k boundary.
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*/
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desc_size = (sizeof(struct tx_desc) * NUM_DESC_PER_RING_TX) + 4096 - 1;
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desc_size = (sizeof(struct tx_desc) * NUM_DESC_PER_RING_TX);
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tx_ring->tx_desc_ring =
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(struct tx_desc *) dma_alloc_coherent(&adapter->pdev->dev,
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desc_size,
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@ -3011,8 +2950,7 @@ static void et131x_tx_dma_memory_free(struct et131x_adapter *adapter)
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if (adapter->tx_ring.tx_desc_ring) {
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/* Free memory relating to Tx rings here */
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desc_size = (sizeof(struct tx_desc) * NUM_DESC_PER_RING_TX)
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+ 4096 - 1;
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desc_size = (sizeof(struct tx_desc) * NUM_DESC_PER_RING_TX);
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dma_free_coherent(&adapter->pdev->dev,
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desc_size,
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adapter->tx_ring.tx_desc_ring,
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