104 lines
2.8 KiB
Diff
104 lines
2.8 KiB
Diff
From: Felix Fietkau <nbd@openwrt.org>
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Date: Sun, 22 Nov 2015 14:03:40 +0100
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Subject: [PATCH] ath10k: do not use coherent memory for allocated device
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memory chunks
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Coherent memory is more expensive to allocate (and constrained on some
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architectures where it has to be pre-allocated). It is also completely
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unnecessary, since the host has no reason to even access these allocated
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memory spaces
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Signed-off-by: Felix Fietkau <nbd@openwrt.org>
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---
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--- a/drivers/net/wireless/ath/ath10k/wmi.c
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+++ b/drivers/net/wireless/ath/ath10k/wmi.c
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@@ -4312,34 +4312,58 @@ void ath10k_wmi_event_vdev_resume_req(st
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ath10k_dbg(ar, ATH10K_DBG_WMI, "WMI_VDEV_RESUME_REQ_EVENTID\n");
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}
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-static int ath10k_wmi_alloc_host_mem(struct ath10k *ar, u32 req_id,
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- u32 num_units, u32 unit_len)
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+static int ath10k_wmi_alloc_chunk(struct ath10k *ar, u32 req_id,
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+ u32 num_units, u32 unit_len)
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{
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dma_addr_t paddr;
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- u32 pool_size;
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+ u32 pool_size = 0;
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int idx = ar->wmi.num_mem_chunks;
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+ void *vaddr = NULL;
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- pool_size = num_units * round_up(unit_len, 4);
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+ if (ar->wmi.num_mem_chunks == ARRAY_SIZE(ar->wmi.mem_chunks))
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+ return -ENOMEM;
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- if (!pool_size)
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- return -EINVAL;
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+ while (!vaddr && num_units) {
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+ pool_size = num_units * round_up(unit_len, 4);
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+ if (!pool_size)
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+ return -EINVAL;
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- ar->wmi.mem_chunks[idx].vaddr = dma_alloc_coherent(ar->dev,
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- pool_size,
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- &paddr,
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- GFP_KERNEL);
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- if (!ar->wmi.mem_chunks[idx].vaddr) {
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- ath10k_warn(ar, "failed to allocate memory chunk\n");
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- return -ENOMEM;
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+ vaddr = kzalloc(pool_size, GFP_KERNEL | __GFP_NOWARN);
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+ if (!vaddr)
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+ num_units /= 2;
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}
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- memset(ar->wmi.mem_chunks[idx].vaddr, 0, pool_size);
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+ if (!num_units)
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+ return -ENOMEM;
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+
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+ paddr = dma_map_single(ar->dev, vaddr, pool_size, DMA_TO_DEVICE);
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+ if (dma_mapping_error(ar->dev, paddr)) {
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+ kfree(vaddr);
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+ return -ENOMEM;
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+ }
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+ ar->wmi.mem_chunks[idx].vaddr = vaddr;
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ar->wmi.mem_chunks[idx].paddr = paddr;
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ar->wmi.mem_chunks[idx].len = pool_size;
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ar->wmi.mem_chunks[idx].req_id = req_id;
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ar->wmi.num_mem_chunks++;
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+ return num_units;
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+}
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+
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+static int ath10k_wmi_alloc_host_mem(struct ath10k *ar, u32 req_id,
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+ u32 num_units, u32 unit_len)
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+{
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+ int ret;
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+
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+ while (num_units) {
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+ ret = ath10k_wmi_alloc_chunk(ar, req_id, num_units, unit_len);
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+ if (ret < 0)
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+ return ret;
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+
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+ num_units -= ret;
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+ }
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+
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return 0;
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}
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@@ -7717,10 +7741,11 @@ void ath10k_wmi_free_host_mem(struct ath
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/* free the host memory chunks requested by firmware */
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for (i = 0; i < ar->wmi.num_mem_chunks; i++) {
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- dma_free_coherent(ar->dev,
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- ar->wmi.mem_chunks[i].len,
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- ar->wmi.mem_chunks[i].vaddr,
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- ar->wmi.mem_chunks[i].paddr);
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+ dma_unmap_single(ar->dev,
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+ ar->wmi.mem_chunks[i].paddr,
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+ ar->wmi.mem_chunks[i].len,
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+ DMA_TO_DEVICE);
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+ kfree(ar->wmi.mem_chunks[i].vaddr);
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}
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ar->wmi.num_mem_chunks = 0;
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