3b21d18587
Make sure allocated data gets freed in error cases. Submitted by: hselasky@ Approved by: hselasky (mentor) MFC after: 1 week Sponsored by: Mellanox Technologies
611 lines
15 KiB
C
611 lines
15 KiB
C
/*-
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* Copyright (c) 2013-2017, Mellanox Technologies, Ltd. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS `AS IS' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <dev/mlx5/driver.h>
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#include "mlx5_core.h"
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CTASSERT((uintptr_t)PAGE_MASK > (uintptr_t)PAGE_SIZE);
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struct mlx5_pages_req {
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struct mlx5_core_dev *dev;
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u16 func_id;
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s32 npages;
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struct work_struct work;
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};
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enum {
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MAX_RECLAIM_TIME_MSECS = 5000,
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};
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static void
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mlx5_fwp_load_mem_cb(void *arg, bus_dma_segment_t *segs, int nseg, int error)
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{
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struct mlx5_fw_page *fwp;
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uint8_t owned;
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fwp = (struct mlx5_fw_page *)arg;
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owned = MLX5_DMA_OWNED(fwp->dev);
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if (!owned)
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MLX5_DMA_LOCK(fwp->dev);
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if (error == 0) {
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KASSERT(nseg == 1, ("Number of segments is different from 1"));
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fwp->dma_addr = segs->ds_addr;
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fwp->load_done = MLX5_LOAD_ST_SUCCESS;
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} else {
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fwp->load_done = MLX5_LOAD_ST_FAILURE;
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}
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MLX5_DMA_DONE(fwp->dev);
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if (!owned)
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MLX5_DMA_UNLOCK(fwp->dev);
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}
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void
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mlx5_fwp_flush(struct mlx5_fw_page *fwp)
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{
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unsigned num = fwp->numpages;
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while (num--)
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bus_dmamap_sync(fwp[num].dev->cmd.dma_tag, fwp[num].dma_map, BUS_DMASYNC_PREWRITE);
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}
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void
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mlx5_fwp_invalidate(struct mlx5_fw_page *fwp)
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{
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unsigned num = fwp->numpages;
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while (num--) {
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bus_dmamap_sync(fwp[num].dev->cmd.dma_tag, fwp[num].dma_map, BUS_DMASYNC_POSTREAD);
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bus_dmamap_sync(fwp[num].dev->cmd.dma_tag, fwp[num].dma_map, BUS_DMASYNC_PREREAD);
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}
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}
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struct mlx5_fw_page *
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mlx5_fwp_alloc(struct mlx5_core_dev *dev, gfp_t flags, unsigned num)
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{
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struct mlx5_fw_page *fwp;
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unsigned x;
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int err;
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/* check for special case */
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if (num == 0) {
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fwp = kzalloc(sizeof(*fwp), flags);
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if (fwp != NULL)
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fwp->dev = dev;
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return (fwp);
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}
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/* we need sleeping context for this function */
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if (flags & M_NOWAIT)
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return (NULL);
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fwp = kzalloc(sizeof(*fwp) * num, flags);
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/* serialize loading the DMA map(s) */
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sx_xlock(&dev->cmd.dma_sx);
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for (x = 0; x != num; x++) {
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/* store pointer to MLX5 core device */
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fwp[x].dev = dev;
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/* store number of pages left from the array */
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fwp[x].numpages = num - x;
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/* allocate memory */
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err = bus_dmamem_alloc(dev->cmd.dma_tag, &fwp[x].virt_addr,
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BUS_DMA_WAITOK | BUS_DMA_COHERENT, &fwp[x].dma_map);
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if (err != 0)
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goto failure;
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/* load memory into DMA */
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MLX5_DMA_LOCK(dev);
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(void) bus_dmamap_load(
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dev->cmd.dma_tag, fwp[x].dma_map, fwp[x].virt_addr,
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MLX5_ADAPTER_PAGE_SIZE, &mlx5_fwp_load_mem_cb,
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fwp + x, BUS_DMA_WAITOK | BUS_DMA_COHERENT);
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while (fwp[x].load_done == MLX5_LOAD_ST_NONE)
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MLX5_DMA_WAIT(dev);
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MLX5_DMA_UNLOCK(dev);
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/* check for error */
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if (fwp[x].load_done != MLX5_LOAD_ST_SUCCESS) {
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bus_dmamem_free(dev->cmd.dma_tag, fwp[x].virt_addr,
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fwp[x].dma_map);
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goto failure;
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}
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}
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sx_xunlock(&dev->cmd.dma_sx);
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return (fwp);
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failure:
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while (x--) {
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bus_dmamap_unload(dev->cmd.dma_tag, fwp[x].dma_map);
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bus_dmamem_free(dev->cmd.dma_tag, fwp[x].virt_addr, fwp[x].dma_map);
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}
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sx_xunlock(&dev->cmd.dma_sx);
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kfree(fwp);
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return (NULL);
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}
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void
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mlx5_fwp_free(struct mlx5_fw_page *fwp)
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{
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struct mlx5_core_dev *dev;
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unsigned num;
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/* be NULL safe */
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if (fwp == NULL)
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return;
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/* check for special case */
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if (fwp->numpages == 0) {
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kfree(fwp);
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return;
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}
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num = fwp->numpages;
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dev = fwp->dev;
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while (num--) {
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bus_dmamap_unload(dev->cmd.dma_tag, fwp[num].dma_map);
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bus_dmamem_free(dev->cmd.dma_tag, fwp[num].virt_addr, fwp[num].dma_map);
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}
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kfree(fwp);
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}
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u64
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mlx5_fwp_get_dma(struct mlx5_fw_page *fwp, size_t offset)
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{
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size_t index = (offset / MLX5_ADAPTER_PAGE_SIZE);
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KASSERT(index < fwp->numpages, ("Invalid offset: %lld", (long long)offset));
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return ((fwp + index)->dma_addr + (offset % MLX5_ADAPTER_PAGE_SIZE));
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}
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void *
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mlx5_fwp_get_virt(struct mlx5_fw_page *fwp, size_t offset)
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{
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size_t index = (offset / MLX5_ADAPTER_PAGE_SIZE);
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KASSERT(index < fwp->numpages, ("Invalid offset: %lld", (long long)offset));
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return ((char *)(fwp + index)->virt_addr + (offset % MLX5_ADAPTER_PAGE_SIZE));
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}
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static int
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mlx5_insert_fw_page_locked(struct mlx5_core_dev *dev, struct mlx5_fw_page *nfp)
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{
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struct rb_root *root = &dev->priv.page_root;
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struct rb_node **new = &root->rb_node;
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struct rb_node *parent = NULL;
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struct mlx5_fw_page *tfp;
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while (*new) {
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parent = *new;
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tfp = rb_entry(parent, struct mlx5_fw_page, rb_node);
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if (tfp->dma_addr < nfp->dma_addr)
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new = &parent->rb_left;
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else if (tfp->dma_addr > nfp->dma_addr)
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new = &parent->rb_right;
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else
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return (-EEXIST);
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}
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rb_link_node(&nfp->rb_node, parent, new);
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rb_insert_color(&nfp->rb_node, root);
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return (0);
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}
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static struct mlx5_fw_page *
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mlx5_remove_fw_page_locked(struct mlx5_core_dev *dev, bus_addr_t addr)
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{
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struct rb_root *root = &dev->priv.page_root;
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struct rb_node *tmp = root->rb_node;
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struct mlx5_fw_page *result = NULL;
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struct mlx5_fw_page *tfp;
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while (tmp) {
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tfp = rb_entry(tmp, struct mlx5_fw_page, rb_node);
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if (tfp->dma_addr < addr) {
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tmp = tmp->rb_left;
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} else if (tfp->dma_addr > addr) {
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tmp = tmp->rb_right;
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} else {
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rb_erase(&tfp->rb_node, &dev->priv.page_root);
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result = tfp;
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break;
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}
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}
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return (result);
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}
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static int
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alloc_4k(struct mlx5_core_dev *dev, u64 *addr, u16 func_id)
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{
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struct mlx5_fw_page *fwp;
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int err;
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fwp = mlx5_fwp_alloc(dev, GFP_KERNEL, 1);
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if (fwp == NULL)
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return (-ENOMEM);
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fwp->func_id = func_id;
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MLX5_DMA_LOCK(dev);
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err = mlx5_insert_fw_page_locked(dev, fwp);
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MLX5_DMA_UNLOCK(dev);
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if (err != 0) {
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mlx5_fwp_free(fwp);
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} else {
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/* make sure cached data is cleaned */
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mlx5_fwp_invalidate(fwp);
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/* store DMA address */
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*addr = fwp->dma_addr;
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}
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return (err);
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}
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static void
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free_4k(struct mlx5_core_dev *dev, u64 addr)
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{
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struct mlx5_fw_page *fwp;
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MLX5_DMA_LOCK(dev);
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fwp = mlx5_remove_fw_page_locked(dev, addr);
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MLX5_DMA_UNLOCK(dev);
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if (fwp == NULL) {
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mlx5_core_warn(dev, "Cannot free 4K page at 0x%llx\n", (long long)addr);
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return;
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}
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mlx5_fwp_free(fwp);
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}
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static int mlx5_cmd_query_pages(struct mlx5_core_dev *dev, u16 *func_id,
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s32 *npages, int boot)
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{
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u32 in[MLX5_ST_SZ_DW(query_pages_in)] = {0};
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u32 out[MLX5_ST_SZ_DW(query_pages_out)] = {0};
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int err;
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MLX5_SET(query_pages_in, in, opcode, MLX5_CMD_OP_QUERY_PAGES);
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MLX5_SET(query_pages_in, in, op_mod, boot ?
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MLX5_QUERY_PAGES_IN_OP_MOD_BOOT_PAGES :
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MLX5_QUERY_PAGES_IN_OP_MOD_INIT_PAGES);
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err = mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
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if (err)
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return err;
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*npages = MLX5_GET(query_pages_out, out, num_pages);
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*func_id = MLX5_GET(query_pages_out, out, function_id);
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return 0;
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}
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static int give_pages(struct mlx5_core_dev *dev, u16 func_id, int npages,
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int notify_fail)
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{
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u32 out[MLX5_ST_SZ_DW(manage_pages_out)] = {0};
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int inlen = MLX5_ST_SZ_BYTES(manage_pages_in);
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u64 addr;
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int err;
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u32 *in, *nin;
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int i = 0;
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inlen += npages * MLX5_FLD_SZ_BYTES(manage_pages_in, pas[0]);
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in = mlx5_vzalloc(inlen);
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if (!in) {
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mlx5_core_warn(dev, "vzalloc failed %d\n", inlen);
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err = -ENOMEM;
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goto out_alloc;
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}
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for (i = 0; i < npages; i++) {
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err = alloc_4k(dev, &addr, func_id);
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if (err)
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goto out_alloc;
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MLX5_ARRAY_SET64(manage_pages_in, in, pas, i, addr);
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}
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MLX5_SET(manage_pages_in, in, opcode, MLX5_CMD_OP_MANAGE_PAGES);
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MLX5_SET(manage_pages_in, in, op_mod, MLX5_PAGES_GIVE);
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MLX5_SET(manage_pages_in, in, function_id, func_id);
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MLX5_SET(manage_pages_in, in, input_num_entries, npages);
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err = mlx5_cmd_exec(dev, in, inlen, out, sizeof(out));
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if (err) {
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mlx5_core_warn(dev, "func_id 0x%x, npages %d, err %d\n",
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func_id, npages, err);
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goto out_alloc;
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}
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dev->priv.fw_pages += npages;
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dev->priv.pages_per_func[func_id] += npages;
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mlx5_core_dbg(dev, "err %d\n", err);
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goto out_free;
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out_alloc:
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if (notify_fail) {
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nin = mlx5_vzalloc(inlen);
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if (!nin)
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goto out_4k;
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memset(&out, 0, sizeof(out));
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MLX5_SET(manage_pages_in, nin, opcode, MLX5_CMD_OP_MANAGE_PAGES);
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MLX5_SET(manage_pages_in, nin, op_mod, MLX5_PAGES_CANT_GIVE);
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MLX5_SET(manage_pages_in, nin, function_id, func_id);
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if (mlx5_cmd_exec(dev, nin, inlen, out, sizeof(out)))
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mlx5_core_warn(dev, "page notify failed\n");
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kvfree(nin);
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}
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out_4k:
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for (i--; i >= 0; i--)
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free_4k(dev, MLX5_GET64(manage_pages_in, in, pas[i]));
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out_free:
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kvfree(in);
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return err;
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}
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static int reclaim_pages_cmd(struct mlx5_core_dev *dev,
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u32 *in, int in_size, u32 *out, int out_size)
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{
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struct mlx5_fw_page *fwp;
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struct rb_node *p;
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u32 func_id;
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u32 npages;
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u32 i = 0;
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if (dev->state != MLX5_DEVICE_STATE_INTERNAL_ERROR)
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return mlx5_cmd_exec(dev, in, in_size, out, out_size);
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/* No hard feelings, we want our pages back! */
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npages = MLX5_GET(manage_pages_in, in, input_num_entries);
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func_id = MLX5_GET(manage_pages_in, in, function_id);
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p = rb_first(&dev->priv.page_root);
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while (p && i < npages) {
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fwp = rb_entry(p, struct mlx5_fw_page, rb_node);
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p = rb_next(p);
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if (fwp->func_id != func_id)
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continue;
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MLX5_ARRAY_SET64(manage_pages_out, out, pas, i, fwp->dma_addr);
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i++;
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}
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MLX5_SET(manage_pages_out, out, output_num_entries, i);
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return 0;
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}
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static int reclaim_pages(struct mlx5_core_dev *dev, u32 func_id, int npages,
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int *nclaimed)
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{
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int outlen = MLX5_ST_SZ_BYTES(manage_pages_out);
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u32 in[MLX5_ST_SZ_DW(manage_pages_in)] = {0};
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int num_claimed;
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u32 *out;
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int err;
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int i;
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if (nclaimed)
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*nclaimed = 0;
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outlen += npages * MLX5_FLD_SZ_BYTES(manage_pages_out, pas[0]);
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out = mlx5_vzalloc(outlen);
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if (!out)
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return -ENOMEM;
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MLX5_SET(manage_pages_in, in, opcode, MLX5_CMD_OP_MANAGE_PAGES);
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MLX5_SET(manage_pages_in, in, op_mod, MLX5_PAGES_TAKE);
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MLX5_SET(manage_pages_in, in, function_id, func_id);
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MLX5_SET(manage_pages_in, in, input_num_entries, npages);
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mlx5_core_dbg(dev, "npages %d, outlen %d\n", npages, outlen);
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err = reclaim_pages_cmd(dev, in, sizeof(in), out, outlen);
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if (err) {
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mlx5_core_err(dev, "failed reclaiming pages\n");
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goto out_free;
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}
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num_claimed = MLX5_GET(manage_pages_out, out, output_num_entries);
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if (nclaimed)
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*nclaimed = num_claimed;
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dev->priv.fw_pages -= num_claimed;
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dev->priv.pages_per_func[func_id] -= num_claimed;
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for (i = 0; i < num_claimed; i++)
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free_4k(dev, MLX5_GET64(manage_pages_out, out, pas[i]));
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out_free:
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kvfree(out);
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return err;
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}
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static void pages_work_handler(struct work_struct *work)
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{
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struct mlx5_pages_req *req = container_of(work, struct mlx5_pages_req, work);
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struct mlx5_core_dev *dev = req->dev;
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int err = 0;
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if (req->npages < 0)
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err = reclaim_pages(dev, req->func_id, -1 * req->npages, NULL);
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else if (req->npages > 0)
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err = give_pages(dev, req->func_id, req->npages, 1);
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if (err)
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mlx5_core_warn(dev, "%s fail %d\n",
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req->npages < 0 ? "reclaim" : "give", err);
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kfree(req);
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}
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void mlx5_core_req_pages_handler(struct mlx5_core_dev *dev, u16 func_id,
|
|
s32 npages)
|
|
{
|
|
struct mlx5_pages_req *req;
|
|
|
|
req = kzalloc(sizeof(*req), GFP_ATOMIC);
|
|
if (!req) {
|
|
mlx5_core_warn(dev, "failed to allocate pages request\n");
|
|
return;
|
|
}
|
|
|
|
req->dev = dev;
|
|
req->func_id = func_id;
|
|
req->npages = npages;
|
|
INIT_WORK(&req->work, pages_work_handler);
|
|
if (!queue_work(dev->priv.pg_wq, &req->work))
|
|
mlx5_core_warn(dev, "failed to queue pages handler work\n");
|
|
}
|
|
|
|
int mlx5_satisfy_startup_pages(struct mlx5_core_dev *dev, int boot)
|
|
{
|
|
u16 uninitialized_var(func_id);
|
|
s32 uninitialized_var(npages);
|
|
int err;
|
|
|
|
err = mlx5_cmd_query_pages(dev, &func_id, &npages, boot);
|
|
if (err)
|
|
return err;
|
|
|
|
mlx5_core_dbg(dev, "requested %d %s pages for func_id 0x%x\n",
|
|
npages, boot ? "boot" : "init", func_id);
|
|
|
|
return give_pages(dev, func_id, npages, 0);
|
|
}
|
|
|
|
enum {
|
|
MLX5_BLKS_FOR_RECLAIM_PAGES = 12
|
|
};
|
|
|
|
s64 mlx5_wait_for_reclaim_vfs_pages(struct mlx5_core_dev *dev)
|
|
{
|
|
int end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
|
|
s64 prevpages = 0;
|
|
s64 npages = 0;
|
|
|
|
while (!time_after(jiffies, end)) {
|
|
/* exclude own function, VFs only */
|
|
npages = dev->priv.fw_pages - dev->priv.pages_per_func[0];
|
|
if (!npages)
|
|
break;
|
|
|
|
if (npages != prevpages)
|
|
end = end + msecs_to_jiffies(100);
|
|
|
|
prevpages = npages;
|
|
msleep(1);
|
|
}
|
|
|
|
if (npages)
|
|
mlx5_core_warn(dev, "FW did not return all VFs pages, will cause to memory leak\n");
|
|
|
|
return -npages;
|
|
}
|
|
|
|
static int optimal_reclaimed_pages(void)
|
|
{
|
|
struct mlx5_cmd_prot_block *block;
|
|
struct mlx5_cmd_layout *lay;
|
|
int ret;
|
|
|
|
ret = (sizeof(lay->out) + MLX5_BLKS_FOR_RECLAIM_PAGES * sizeof(block->data) -
|
|
MLX5_ST_SZ_BYTES(manage_pages_out)) /
|
|
MLX5_FLD_SZ_BYTES(manage_pages_out, pas[0]);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int mlx5_reclaim_startup_pages(struct mlx5_core_dev *dev)
|
|
{
|
|
int end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
|
|
struct mlx5_fw_page *fwp;
|
|
struct rb_node *p;
|
|
int nclaimed = 0;
|
|
int err;
|
|
|
|
do {
|
|
p = rb_first(&dev->priv.page_root);
|
|
if (p) {
|
|
fwp = rb_entry(p, struct mlx5_fw_page, rb_node);
|
|
err = reclaim_pages(dev, fwp->func_id,
|
|
optimal_reclaimed_pages(),
|
|
&nclaimed);
|
|
if (err) {
|
|
mlx5_core_warn(dev, "failed reclaiming pages (%d)\n",
|
|
err);
|
|
return err;
|
|
}
|
|
|
|
if (nclaimed)
|
|
end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
|
|
}
|
|
if (time_after(jiffies, end)) {
|
|
mlx5_core_warn(dev, "FW did not return all pages. giving up...\n");
|
|
break;
|
|
}
|
|
} while (p);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void mlx5_pagealloc_init(struct mlx5_core_dev *dev)
|
|
{
|
|
|
|
dev->priv.page_root = RB_ROOT;
|
|
}
|
|
|
|
void mlx5_pagealloc_cleanup(struct mlx5_core_dev *dev)
|
|
{
|
|
/* nothing */
|
|
}
|
|
|
|
int mlx5_pagealloc_start(struct mlx5_core_dev *dev)
|
|
{
|
|
dev->priv.pg_wq = create_singlethread_workqueue("mlx5_page_allocator");
|
|
if (!dev->priv.pg_wq)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void mlx5_pagealloc_stop(struct mlx5_core_dev *dev)
|
|
{
|
|
destroy_workqueue(dev->priv.pg_wq);
|
|
}
|