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path: root/drivers/net/wireless/ath/wil6210/pmc.c
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Diffstat (limited to 'drivers/net/wireless/ath/wil6210/pmc.c')
-rw-r--r--drivers/net/wireless/ath/wil6210/pmc.c459
1 files changed, 459 insertions, 0 deletions
diff --git a/drivers/net/wireless/ath/wil6210/pmc.c b/drivers/net/wireless/ath/wil6210/pmc.c
new file mode 100644
index 0000000..4b7ac14
--- /dev/null
+++ b/drivers/net/wireless/ath/wil6210/pmc.c
@@ -0,0 +1,459 @@
+/*
+ * Copyright (c) 2012-2015,2017 Qualcomm Atheros, Inc.
+ * Copyright (c) 2018, The Linux Foundation. All rights reserved.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/seq_file.h>
+#include "wmi.h"
+#include "wil6210.h"
+#include "txrx.h"
+#include "pmc.h"
+
+struct desc_alloc_info {
+ dma_addr_t pa;
+ void *va;
+};
+
+static int wil_is_pmc_allocated(struct pmc_ctx *pmc)
+{
+ return !!pmc->pring_va;
+}
+
+void wil_pmc_init(struct wil6210_priv *wil)
+{
+ memset(&wil->pmc, 0, sizeof(struct pmc_ctx));
+ mutex_init(&wil->pmc.lock);
+}
+
+/**
+ * Allocate the physical ring (p-ring) and the required
+ * number of descriptors of required size.
+ * Initialize the descriptors as required by pmc dma.
+ * The descriptors' buffers dwords are initialized to hold
+ * dword's serial number in the lsw and reserved value
+ * PCM_DATA_INVALID_DW_VAL in the msw.
+ */
+void wil_pmc_alloc(struct wil6210_priv *wil,
+ int num_descriptors,
+ int descriptor_size)
+{
+ u32 i;
+ struct pmc_ctx *pmc = &wil->pmc;
+ struct device *dev = wil_to_dev(wil);
+ struct wil6210_vif *vif = ndev_to_vif(wil->main_ndev);
+ struct wmi_pmc_cmd pmc_cmd = {0};
+ int last_cmd_err = -ENOMEM;
+
+ mutex_lock(&pmc->lock);
+
+ if (wil_is_pmc_allocated(pmc)) {
+ /* sanity check */
+ wil_err(wil, "ERROR pmc is already allocated\n");
+ goto no_release_err;
+ }
+ if ((num_descriptors <= 0) || (descriptor_size <= 0)) {
+ wil_err(wil,
+ "Invalid params num_descriptors(%d), descriptor_size(%d)\n",
+ num_descriptors, descriptor_size);
+ last_cmd_err = -EINVAL;
+ goto no_release_err;
+ }
+
+ if (num_descriptors > (1 << WIL_RING_SIZE_ORDER_MAX)) {
+ wil_err(wil,
+ "num_descriptors(%d) exceeds max ring size %d\n",
+ num_descriptors, 1 << WIL_RING_SIZE_ORDER_MAX);
+ last_cmd_err = -EINVAL;
+ goto no_release_err;
+ }
+
+ if (num_descriptors > INT_MAX / descriptor_size) {
+ wil_err(wil,
+ "Overflow in num_descriptors(%d)*descriptor_size(%d)\n",
+ num_descriptors, descriptor_size);
+ last_cmd_err = -EINVAL;
+ goto no_release_err;
+ }
+
+ pmc->num_descriptors = num_descriptors;
+ pmc->descriptor_size = descriptor_size;
+
+ wil_dbg_misc(wil, "pmc_alloc: %d descriptors x %d bytes each\n",
+ num_descriptors, descriptor_size);
+
+ /* allocate descriptors info list in pmc context*/
+ pmc->descriptors = kcalloc(num_descriptors,
+ sizeof(struct desc_alloc_info),
+ GFP_KERNEL);
+ if (!pmc->descriptors) {
+ wil_err(wil, "ERROR allocating pmc skb list\n");
+ goto no_release_err;
+ }
+
+ wil_dbg_misc(wil, "pmc_alloc: allocated descriptors info list %p\n",
+ pmc->descriptors);
+
+ /* Allocate pring buffer and descriptors.
+ * vring->va should be aligned on its size rounded up to power of 2
+ * This is granted by the dma_alloc_coherent.
+ *
+ * HW has limitation that all vrings addresses must share the same
+ * upper 16 msb bits part of 48 bits address. To workaround that,
+ * if we are using more than 32 bit addresses switch to 32 bit
+ * allocation before allocating vring memory.
+ *
+ * There's no check for the return value of dma_set_mask_and_coherent,
+ * since we assume if we were able to set the mask during
+ * initialization in this system it will not fail if we set it again
+ */
+ if (wil->dma_addr_size > 32)
+ dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
+
+ pmc->pring_va = dma_alloc_coherent(dev,
+ sizeof(struct vring_tx_desc) * num_descriptors,
+ &pmc->pring_pa,
+ GFP_KERNEL);
+
+ if (wil->dma_addr_size > 32)
+ dma_set_mask_and_coherent(dev,
+ DMA_BIT_MASK(wil->dma_addr_size));
+
+ wil_dbg_misc(wil,
+ "pmc_alloc: allocated pring %p => %pad. %zd x %d = total %zd bytes\n",
+ pmc->pring_va, &pmc->pring_pa,
+ sizeof(struct vring_tx_desc),
+ num_descriptors,
+ sizeof(struct vring_tx_desc) * num_descriptors);
+
+ if (!pmc->pring_va) {
+ wil_err(wil, "ERROR allocating pmc pring\n");
+ goto release_pmc_skb_list;
+ }
+
+ /* initially, all descriptors are SW owned
+ * For Tx, Rx, and PMC, ownership bit is at the same location, thus
+ * we can use any
+ */
+ for (i = 0; i < num_descriptors; i++) {
+ struct vring_tx_desc *_d = &pmc->pring_va[i];
+ struct vring_tx_desc dd = {}, *d = &dd;
+ int j = 0;
+
+ pmc->descriptors[i].va = dma_alloc_coherent(dev,
+ descriptor_size,
+ &pmc->descriptors[i].pa,
+ GFP_KERNEL);
+
+ if (unlikely(!pmc->descriptors[i].va)) {
+ wil_err(wil, "ERROR allocating pmc descriptor %d", i);
+ goto release_pmc_skbs;
+ }
+
+ for (j = 0; j < descriptor_size / sizeof(u32); j++) {
+ u32 *p = (u32 *)pmc->descriptors[i].va + j;
+ *p = PCM_DATA_INVALID_DW_VAL | j;
+ }
+
+ /* configure dma descriptor */
+ d->dma.addr.addr_low =
+ cpu_to_le32(lower_32_bits(pmc->descriptors[i].pa));
+ d->dma.addr.addr_high =
+ cpu_to_le16((u16)upper_32_bits(pmc->descriptors[i].pa));
+ d->dma.status = 0; /* 0 = HW_OWNED */
+ d->dma.length = cpu_to_le16(descriptor_size);
+ d->dma.d0 = BIT(9) | RX_DMA_D0_CMD_DMA_IT;
+ *_d = *d;
+ }
+
+ wil_dbg_misc(wil, "pmc_alloc: allocated successfully\n");
+
+ pmc_cmd.op = WMI_PMC_ALLOCATE;
+ pmc_cmd.ring_size = cpu_to_le16(pmc->num_descriptors);
+ pmc_cmd.mem_base = cpu_to_le64(pmc->pring_pa);
+
+ wil_dbg_misc(wil, "pmc_alloc: send WMI_PMC_CMD with ALLOCATE op\n");
+ pmc->last_cmd_status = wmi_send(wil,
+ WMI_PMC_CMDID,
+ vif->mid,
+ &pmc_cmd,
+ sizeof(pmc_cmd));
+ if (pmc->last_cmd_status) {
+ wil_err(wil,
+ "WMI_PMC_CMD with ALLOCATE op failed with status %d",
+ pmc->last_cmd_status);
+ goto release_pmc_skbs;
+ }
+
+ mutex_unlock(&pmc->lock);
+
+ return;
+
+release_pmc_skbs:
+ wil_err(wil, "exit on error: Releasing skbs...\n");
+ for (i = 0; i < num_descriptors && pmc->descriptors[i].va; i++) {
+ dma_free_coherent(dev,
+ descriptor_size,
+ pmc->descriptors[i].va,
+ pmc->descriptors[i].pa);
+
+ pmc->descriptors[i].va = NULL;
+ }
+ wil_err(wil, "exit on error: Releasing pring...\n");
+
+ dma_free_coherent(dev,
+ sizeof(struct vring_tx_desc) * num_descriptors,
+ pmc->pring_va,
+ pmc->pring_pa);
+
+ pmc->pring_va = NULL;
+
+release_pmc_skb_list:
+ wil_err(wil, "exit on error: Releasing descriptors info list...\n");
+ kfree(pmc->descriptors);
+ pmc->descriptors = NULL;
+
+no_release_err:
+ pmc->last_cmd_status = last_cmd_err;
+ mutex_unlock(&pmc->lock);
+}
+
+/**
+ * Traverse the p-ring and release all buffers.
+ * At the end release the p-ring memory
+ */
+void wil_pmc_free(struct wil6210_priv *wil, int send_pmc_cmd)
+{
+ struct pmc_ctx *pmc = &wil->pmc;
+ struct device *dev = wil_to_dev(wil);
+ struct wil6210_vif *vif = ndev_to_vif(wil->main_ndev);
+ struct wmi_pmc_cmd pmc_cmd = {0};
+
+ mutex_lock(&pmc->lock);
+
+ pmc->last_cmd_status = 0;
+
+ if (!wil_is_pmc_allocated(pmc)) {
+ wil_dbg_misc(wil,
+ "pmc_free: Error, can't free - not allocated\n");
+ pmc->last_cmd_status = -EPERM;
+ mutex_unlock(&pmc->lock);
+ return;
+ }
+
+ if (send_pmc_cmd) {
+ wil_dbg_misc(wil, "send WMI_PMC_CMD with RELEASE op\n");
+ pmc_cmd.op = WMI_PMC_RELEASE;
+ pmc->last_cmd_status =
+ wmi_send(wil, WMI_PMC_CMDID, vif->mid,
+ &pmc_cmd, sizeof(pmc_cmd));
+ if (pmc->last_cmd_status) {
+ wil_err(wil,
+ "WMI_PMC_CMD with RELEASE op failed, status %d",
+ pmc->last_cmd_status);
+ /* There's nothing we can do with this error.
+ * Normally, it should never occur.
+ * Continue to freeing all memory allocated for pmc.
+ */
+ }
+ }
+
+ if (pmc->pring_va) {
+ size_t buf_size = sizeof(struct vring_tx_desc) *
+ pmc->num_descriptors;
+
+ wil_dbg_misc(wil, "pmc_free: free pring va %p\n",
+ pmc->pring_va);
+ dma_free_coherent(dev, buf_size, pmc->pring_va, pmc->pring_pa);
+
+ pmc->pring_va = NULL;
+ } else {
+ pmc->last_cmd_status = -ENOENT;
+ }
+
+ if (pmc->descriptors) {
+ int i;
+
+ for (i = 0;
+ i < pmc->num_descriptors && pmc->descriptors[i].va; i++) {
+ dma_free_coherent(dev,
+ pmc->descriptor_size,
+ pmc->descriptors[i].va,
+ pmc->descriptors[i].pa);
+ pmc->descriptors[i].va = NULL;
+ }
+ wil_dbg_misc(wil, "pmc_free: free descriptor info %d/%d\n", i,
+ pmc->num_descriptors);
+ wil_dbg_misc(wil,
+ "pmc_free: free pmc descriptors info list %p\n",
+ pmc->descriptors);
+ kfree(pmc->descriptors);
+ pmc->descriptors = NULL;
+ } else {
+ pmc->last_cmd_status = -ENOENT;
+ }
+
+ mutex_unlock(&pmc->lock);
+}
+
+/**
+ * Status of the last operation requested via debugfs: alloc/free/read.
+ * 0 - success or negative errno
+ */
+int wil_pmc_last_cmd_status(struct wil6210_priv *wil)
+{
+ wil_dbg_misc(wil, "pmc_last_cmd_status: status %d\n",
+ wil->pmc.last_cmd_status);
+
+ return wil->pmc.last_cmd_status;
+}
+
+/**
+ * Read from required position up to the end of current descriptor,
+ * depends on descriptor size configured during alloc request.
+ */
+ssize_t wil_pmc_read(struct file *filp, char __user *buf, size_t count,
+ loff_t *f_pos)
+{
+ struct wil6210_priv *wil = filp->private_data;
+ struct pmc_ctx *pmc = &wil->pmc;
+ size_t retval = 0;
+ unsigned long long idx;
+ loff_t offset;
+ size_t pmc_size;
+
+ mutex_lock(&pmc->lock);
+
+ if (!wil_is_pmc_allocated(pmc)) {
+ wil_err(wil, "error, pmc is not allocated!\n");
+ pmc->last_cmd_status = -EPERM;
+ mutex_unlock(&pmc->lock);
+ return -EPERM;
+ }
+
+ pmc_size = pmc->descriptor_size * pmc->num_descriptors;
+
+ wil_dbg_misc(wil,
+ "pmc_read: size %u, pos %lld\n",
+ (u32)count, *f_pos);
+
+ pmc->last_cmd_status = 0;
+
+ idx = *f_pos;
+ do_div(idx, pmc->descriptor_size);
+ offset = *f_pos - (idx * pmc->descriptor_size);
+
+ if (*f_pos >= pmc_size) {
+ wil_dbg_misc(wil,
+ "pmc_read: reached end of pmc buf: %lld >= %u\n",
+ *f_pos, (u32)pmc_size);
+ pmc->last_cmd_status = -ERANGE;
+ goto out;
+ }
+
+ wil_dbg_misc(wil,
+ "pmc_read: read from pos %lld (descriptor %llu, offset %llu) %zu bytes\n",
+ *f_pos, idx, offset, count);
+
+ /* if no errors, return the copied byte count */
+ retval = simple_read_from_buffer(buf,
+ count,
+ &offset,
+ pmc->descriptors[idx].va,
+ pmc->descriptor_size);
+ *f_pos += retval;
+out:
+ mutex_unlock(&pmc->lock);
+
+ return retval;
+}
+
+loff_t wil_pmc_llseek(struct file *filp, loff_t off, int whence)
+{
+ loff_t newpos;
+ struct wil6210_priv *wil = filp->private_data;
+ struct pmc_ctx *pmc = &wil->pmc;
+ size_t pmc_size;
+
+ mutex_lock(&pmc->lock);
+
+ if (!wil_is_pmc_allocated(pmc)) {
+ wil_err(wil, "error, pmc is not allocated!\n");
+ pmc->last_cmd_status = -EPERM;
+ mutex_unlock(&pmc->lock);
+ return -EPERM;
+ }
+
+ pmc_size = pmc->descriptor_size * pmc->num_descriptors;
+
+ switch (whence) {
+ case 0: /* SEEK_SET */
+ newpos = off;
+ break;
+
+ case 1: /* SEEK_CUR */
+ newpos = filp->f_pos + off;
+ break;
+
+ case 2: /* SEEK_END */
+ newpos = pmc_size;
+ break;
+
+ default: /* can't happen */
+ newpos = -EINVAL;
+ goto out;
+ }
+
+ if (newpos < 0) {
+ newpos = -EINVAL;
+ goto out;
+ }
+ if (newpos > pmc_size)
+ newpos = pmc_size;
+
+ filp->f_pos = newpos;
+
+out:
+ mutex_unlock(&pmc->lock);
+
+ return newpos;
+}
+
+int wil_pmcring_read(struct seq_file *s, void *data)
+{
+ struct wil6210_priv *wil = s->private;
+ struct pmc_ctx *pmc = &wil->pmc;
+ size_t pmc_ring_size =
+ sizeof(struct vring_rx_desc) * pmc->num_descriptors;
+
+ mutex_lock(&pmc->lock);
+
+ if (!wil_is_pmc_allocated(pmc)) {
+ wil_err(wil, "error, pmc is not allocated!\n");
+ pmc->last_cmd_status = -EPERM;
+ mutex_unlock(&pmc->lock);
+ return -EPERM;
+ }
+
+ wil_dbg_misc(wil, "pmcring_read: size %zu\n", pmc_ring_size);
+
+ seq_write(s, pmc->pring_va, pmc_ring_size);
+
+ mutex_unlock(&pmc->lock);
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.0.4) at 2024-04-23 09:13:35 +0000