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Archived-At: List-Archive: List-Help: List-Post: List-Subscribe: List-Unsubscribe: From: Alastair D'Silva Add functions to map/unmap LPC memory Signed-off-by: Alastair D'Silva Acked-by: Frederic Barrat --- drivers/misc/ocxl/core.c | 51 +++++++++++++++++++++++++++++++ drivers/misc/ocxl/ocxl_internal.h | 3 ++ include/misc/ocxl.h | 21 +++++++++++++ 3 files changed, 75 insertions(+) diff --git a/drivers/misc/ocxl/core.c b/drivers/misc/ocxl/core.c index 2531c6cf19a0..75ff14e3882a 100644 --- a/drivers/misc/ocxl/core.c +++ b/drivers/misc/ocxl/core.c @@ -210,6 +210,56 @@ static void unmap_mmio_areas(struct ocxl_afu *afu) release_fn_bar(afu->fn, afu->config.global_mmio_bar); } +int ocxl_afu_map_lpc_mem(struct ocxl_afu *afu) +{ + struct pci_dev *dev = to_pci_dev(afu->fn->dev.parent); + + if ((afu->config.lpc_mem_size + afu->config.special_purpose_mem_size) == 0) + return 0; + + afu->lpc_base_addr = ocxl_link_lpc_map(afu->fn->link, dev); + if (afu->lpc_base_addr == 0) + return -EINVAL; + + if (afu->config.lpc_mem_size > 0) { + afu->lpc_res.start = afu->lpc_base_addr + afu->config.lpc_mem_offset; + afu->lpc_res.end = afu->lpc_res.start + afu->config.lpc_mem_size - 1; + } + + if (afu->config.special_purpose_mem_size > 0) { + afu->special_purpose_res.start = afu->lpc_base_addr + + afu->config.special_purpose_mem_offset; + afu->special_purpose_res.end = afu->special_purpose_res.start + + afu->config.special_purpose_mem_size - 1; + } + + return 0; +} +EXPORT_SYMBOL_GPL(ocxl_afu_map_lpc_mem); + +struct resource *ocxl_afu_lpc_mem(struct ocxl_afu *afu) +{ + return &afu->lpc_res; +} +EXPORT_SYMBOL_GPL(ocxl_afu_lpc_mem); + +static void unmap_lpc_mem(struct ocxl_afu *afu) +{ + struct pci_dev *dev = to_pci_dev(afu->fn->dev.parent); + + if (afu->lpc_res.start || afu->special_purpose_res.start) { + void *link = afu->fn->link; + + // only release the link when the the last consumer calls release + ocxl_link_lpc_release(link, dev); + + afu->lpc_res.start = 0; + afu->lpc_res.end = 0; + afu->special_purpose_res.start = 0; + afu->special_purpose_res.end = 0; + } +} + static int configure_afu(struct ocxl_afu *afu, u8 afu_idx, struct pci_dev *dev) { int rc; @@ -251,6 +301,7 @@ static int configure_afu(struct ocxl_afu *afu, u8 afu_idx, struct pci_dev *dev) static void deconfigure_afu(struct ocxl_afu *afu) { + unmap_lpc_mem(afu); unmap_mmio_areas(afu); reclaim_afu_pasid(afu); reclaim_afu_actag(afu); diff --git a/drivers/misc/ocxl/ocxl_internal.h b/drivers/misc/ocxl/ocxl_internal.h index d0c8c4838f42..ce0cac1da416 100644 --- a/drivers/misc/ocxl/ocxl_internal.h +++ b/drivers/misc/ocxl/ocxl_internal.h @@ -52,6 +52,9 @@ struct ocxl_afu { void __iomem *global_mmio_ptr; u64 pp_mmio_start; void *private; + u64 lpc_base_addr; /* Covers both LPC & special purpose memory */ + struct resource lpc_res; + struct resource special_purpose_res; }; enum ocxl_context_status { diff --git a/include/misc/ocxl.h b/include/misc/ocxl.h index 357ef1aadbc0..d8b0b4d46bfb 100644 --- a/include/misc/ocxl.h +++ b/include/misc/ocxl.h @@ -203,6 +203,27 @@ int ocxl_irq_set_handler(struct ocxl_context *ctx, int irq_id, // AFU Metadata +/** + * ocxl_afu_map_lpc_mem() - Map the LPC system & special purpose memory for an AFU + * Do not call this during device discovery, as there may me multiple + * devices on a link, and the memory is mapped for the whole link, not + * just one device. It should only be called after all devices have + * registered their memory on the link. + * + * @afu: The AFU that has the LPC memory to map + * + * Returns 0 on success, negative on failure + */ +int ocxl_afu_map_lpc_mem(struct ocxl_afu *afu); + +/** + * ocxl_afu_lpc_mem() - Get the physical address range of LPC memory for an AFU + * @afu: The AFU associated with the LPC memory + * + * Returns a pointer to the resource struct for the physical address range + */ +struct resource *ocxl_afu_lpc_mem(struct ocxl_afu *afu); + /** * ocxl_afu_config() - Get a pointer to the config for an AFU * @afu: a pointer to the AFU to get the config for